WO2015192650A1 - 一种电源管理方法及电源 - Google Patents

一种电源管理方法及电源 Download PDF

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Publication number
WO2015192650A1
WO2015192650A1 PCT/CN2015/070137 CN2015070137W WO2015192650A1 WO 2015192650 A1 WO2015192650 A1 WO 2015192650A1 CN 2015070137 W CN2015070137 W CN 2015070137W WO 2015192650 A1 WO2015192650 A1 WO 2015192650A1
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Prior art keywords
circuit
cycle
bridge arm
bridge
control circuit
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2015/070137
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English (en)
French (fr)
Inventor
侯召政
樊晓东
程杰斌
刘志华
张学臻
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP15810506.4A priority Critical patent/EP3136578B1/en
Publication of WO2015192650A1 publication Critical patent/WO2015192650A1/zh
Priority to US15/383,614 priority patent/US9787203B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33538—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type
    • H02M3/33546—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type with automatic control of the output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • H02M3/3376—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the present invention relates to the field of electronic technologies, and in particular, to a power management method and a power supply.
  • Digital power controllers can be used to output a constant voltage source, often encountering input disturbances and output disturbances.
  • feedforward techniques are usually used, and the implementation methods are also available in a variety of ways, pure digital feedforward, etc.; or peak current mode control, but the peak current mode is inversely logical due to dynamic regulation of the load (ie, when When the load current increases, the duty cycle decreases.)
  • the sensitivity of the feedforward is affected, and the suppression of the input disturbance is reduced. Therefore, it is difficult to suppress the output disturbance and suppress the input disturbance. balance.
  • the controller In isolated power applications, in order to facilitate communication and output current detection, output voltage feedback, the controller is usually placed on the secondary side, so various feedforward methods will encounter input voltage detection problems, especially with digital feedforward sampling point settings. It is a tough choice.
  • the technical problem to be solved by the embodiments of the present invention is to provide a power management method and a power supply. It can obtain good feedforward performance, suppress input disturbance, and at the same time eliminate the bias in the power supply, protect the transformer and ensure the normal operation of the power supply.
  • a first aspect of the embodiments of the present invention provides a power management method for suppressing input disturbance of a power supply and avoiding bias of a power transformer, the power supply including a full bridge topology circuit and a control circuit, wherein the control circuit includes a logic control circuit a feedforward circuit and a feedback circuit, wherein a secondary side of the full-bridge topology circuit uses a full-wave rectifier circuit for sampling a center tap voltage of the full-wave rectifier circuit, and using the intermediate tap voltage to front The capacitor in the feed circuit is charged, and the logic control circuit controls the feedforward circuit switch tube to periodically discharge the capacitance in the feedforward circuit to generate an input characterizing the power supply And a sawtooth wave corresponding to the two bridge arms of the full bridge topology circuit, the different slopes of the sawtooth wave correspond to different input voltages of the power source; the feedforward circuit uses the sawtooth wave as a feedforward control signal; the power management method includes: modulating and matching the feedback control signal of the feedback circuit by the sawtooth signal by the logic control
  • the two bridge arms include a first bridge arm and a second bridge arm, the first bridge arm being in the first half of a switching cycle of the logic control circuit Periodically conducting, the second bridge arm is turned on during a second half of a switching cycle of the logic control circuit, and the logic control circuit adjusts a control signal of the switch of the full-bridge topology circuit, so that the original Matching the duty cycle of the two bridge arms, symmetrical or long-term matching within one switching cycle of the logic control circuit, including:
  • Adjusting, by the logic control circuit, a control signal of the two bridge arm switches according to a middle tap voltage sampled by the feedforward circuit in a first half cycle during a switching cycle of the logic control circuit, so that the The duty cycle of the second bridge arm operating in the second half cycle is the same as the duty cycle of the first bridge arm operating in the first half cycle;
  • the logic control circuit is based on the feedforward circuit at the one switch The intermediate tap voltage sampled during the period, adjusting the control signals of the two bridge arm switches, so that the duty ratio of the second bridge arm working in the second half cycle and the work of the first bridge arm in the first half cycle The same ratio;
  • the second bridge arm switch tube is not adjusted by the logic control circuit control signal.
  • the two bridge arms include a first bridge arm and a second bridge arm, the first bridge arm being in the first half of a switching cycle of the logic control circuit Periodic guide
  • the second bridge arm is turned on during a second half of a switching cycle of the logic control circuit, and the logic control circuit adjusts a control signal of the switch of the full-bridge topology circuit, so that the primary side is two Duty cycle matching for bridge arm operation, including:
  • the secondary side of the full-bridge topology circuit may further adopt a current doubler rectification circuit, where the front The feeding circuit is configured to sample the voltage of the output terminal after rectification of the double current rectifying circuit, and charge the capacitor in the feedforward circuit by using the voltage of the output terminal after rectification by the double current rectifying circuit, and control the feedforward circuit switch tube pair through the logic control circuit
  • a capacitor in the feedforward circuit is periodically discharged to generate a sawtooth wave that characterizes an input voltage of the power source and respectively corresponds to two bridge arms of the full bridge topology circuit, the different slopes of the sawtooth wave corresponding to the a different input voltage of the power supply;
  • the feedforward circuit uses the sawtooth wave as a feedforward control signal;
  • the power management method includes: feedback control of the feedback circuit by modulating the sawtooth signal by the logic control circuit Signals are matched to achieve feedforward performance while preventing biasing; specifically:
  • the two bridge arms include a first bridge arm and a second bridge arm, and the first bridge arm is in the logic a first half cycle of a switching cycle of the control circuit is turned on, the second bridge arm being turned on during a second half of a switching cycle of the logic control circuit, wherein the full bridge topology circuit is adjusted by the logic control circuit turning tube
  • the control signal is such that the duty ratios of the two bridge arms of the primary side match, symmetrically or long-term matching within one switching cycle of the logic control circuit, including:
  • the duty ratio of the second bridge arm operating in the second half period is greater than the duty ratio of the first bridge arm operating in the first half period, sampling by the logic control circuit in the first half period based on the feedforward circuit
  • the current doubler rectifier circuit rectifies the voltage of the output terminal, and adjusts the control signals of the two bridge arm switch tubes, so that the duty ratio of the second bridge arm working in the second half cycle is opposite to the first bridge arm
  • the duty cycle of the first half cycle is the same;
  • the second bridge arm switch tube is not adjusted by the logic control circuit control signal.
  • the two bridge arms include a first bridge arm and a second bridge arm, and the first bridge arm is in the logic a first half cycle of a switching cycle of the control circuit is turned on, the second bridge arm being turned on during a second half of a switching cycle of the logic control circuit, wherein the full bridge topology circuit is adjusted by the logic control circuit
  • the control signal of the switch tube matches the duty ratio of the working of the two bridge arms on the primary side, including:
  • the method further includes:
  • the primary side of the transformer and the transformer are connected in series with a straight-line capacitor to assist in correcting the bias.
  • a second aspect of the embodiments of the present invention provides a power supply for suppressing input disturbance of a power supply and preventing a bias of a power transformer
  • the power supply includes a full bridge topology circuit and a control circuit
  • the control circuit includes a logic control circuit and a feedforward a circuit and a feedback circuit
  • a secondary side of the full-bridge topology circuit uses a full-wave rectifier circuit
  • the feedforward circuit is configured to sample a middle tap voltage of the full-wave rectifier circuit
  • the intermediate tap voltage is used in a feedforward circuit Capacitor charging
  • controlling a feedforward circuit switch tube to periodically discharge a capacitor in the feedforward circuit through a logic control circuit to generate an input voltage representative of the power source and respectively with two bridge arms of the full bridge topology circuit
  • Corresponding sawtooth wave the different slopes of the sawtooth wave correspond to different input voltages of the power source
  • the feedforward circuit uses the sawtooth wave as a feedforward control signal
  • the logic control circuit is configured to use the saw
  • a comparison circuit configured to compare the feedforward control signal and the feedback control signal, and match the compared signal output to obtain a control signal of the switch of the full bridge topology circuit
  • a switching tube control circuit configured to adjust a control signal of the switch circuit of the full-bridge topology circuit, so that a duty ratio of two primary arm working on the primary side is matched, and a symmetric or long-term matching is performed in one switching cycle of the logic control circuit, Prevent the transformer from being biased.
  • the two bridge arms include a first bridge arm and a second bridge arm, the first bridge arm being in the first half of a switching cycle of the logic control circuit Periodically conducting, the second bridge arm is turned on during a second half of a switching cycle of the logic control circuit, and the switch tube control circuit is specifically configured to:
  • Adjusting a control signal of the two bridge arm switches in a switching cycle of the logic control circuit based on a center tap voltage sampled by the feedforward circuit during a first half cycle, so that the second bridge arm is in the second half
  • the duty cycle of the periodic operation is the same as the duty cycle of the first bridge arm during the first half cycle
  • the logic control circuit is based on the sampling of the feedforward circuit during the first half cycle a middle tap voltage, adjusting a control signal of the two bridge arm switches, so that a duty ratio of the second bridge arm working in the second half period is the same as a duty ratio of the first bridge arm operating in the first half period;
  • the logic control circuit does not adjust the control of the second bridge arm switch tube signal.
  • the two bridge arms comprise a first bridge arm And a second bridge arm that is turned on during a first half cycle of a switching cycle of the logic control circuit, the second bridge arm being turned on during a second half of a switching cycle of the logic control circuit
  • the switch tube control circuit is specifically configured to:
  • the logic control circuit is based on the feedforward circuit a middle tap voltage sampled in a second half of a cycle, adjusting a control signal of the first bridge arm switch, a duty ratio of the first bridge arm operating in a first half cycle of the second cycle, and the second The duty cycle of the bridge arms operating during the second half of the first cycle is the same.
  • the secondary side of the full-bridge topology circuit may further adopt a current doubler rectifying circuit
  • the feedforward circuit is configured to sample the double current rectifying circuit after rectification
  • the voltage at the output terminal is charged by the voltage of the output terminal after rectification by the double current rectifying circuit, and the capacitor in the feedforward circuit is periodically discharged by the logic control circuit to control the feedforward circuit switch tube to generate a characterization
  • the feedforward circuit will be The sawtooth wave is used as a feedforward control signal;
  • the logic control circuit is configured to modulate and match the sawtooth wave signal with a feedback control signal of the feedback circuit to obtain feedforward performance while preventing biasing;
  • the logic control circuit Specifically include:
  • a comparison circuit configured to compare the feedforward control signal and the feedback control signal, and match the compared signal output to obtain a control signal of the switch of the full bridge topology circuit
  • a switching tube control circuit configured to adjust a control signal of the switch circuit of the full-bridge topology circuit, so that a duty ratio of two primary arm working on the primary side is matched, and a symmetric or long-term matching is performed in one switching cycle of the logic control circuit, Prevent the transformer from being biased.
  • the two bridge arms include a first bridge arm and a second bridge arm, and the first bridge arm is in the logic The first half of one switching cycle of the control circuit is turned on, and the second leg is turned on during a second half of a switching cycle of the logic control circuit, and the switching transistor control circuit is specifically configured to:
  • the duty ratio of the second bridge arm operating in the second half period is greater than the duty ratio of the first bridge arm operating in the first half period, based on the current doubler rectification sampled by the feedforward circuit in the first half period
  • the voltage of the output end of the circuit is rectified, and the control signals of the two bridge arm switches are adjusted to make the duty ratio of the second bridge arm working in the second half cycle and the duty of the first bridge arm in the first half cycle More than the same;
  • the control signal of the second bridge arm switch tube is not adjusted.
  • the two bridge arms include a first bridge arm and a second bridge arm, and the first bridge arm is in the logic The first half of one switching cycle of the control circuit is turned on, and the second leg is turned on during a second half of a switching cycle of the logic control circuit, and the switching transistor control circuit is specifically configured to:
  • the control signals of the two bridge arm switches on the primary side of the full-bridge topology circuit are adjusted by the logic control circuit to ensure that the duty ratio of the two bridge arms is in operation. Symmetrical or long-term matching in one switching cycle of the logic control circuit, thereby eliminating the biasing generated in the transformer, suppressing the input disturbance of the power supply and avoiding the requirement of obtaining good feedforward performance and quickly responding to changes in the input voltage
  • the power transformer is biased to ensure that the power supply is working properly.
  • FIG. 1 is a circuit diagram of an embodiment of a power supply of the present invention
  • FIG. 2 is a circuit diagram of another embodiment of a power supply of the present invention.
  • FIG. 3 is a schematic flow chart of an embodiment of a power management method according to the present invention.
  • Figure 7 is still another matching logic diagram of the power management method of the present invention.
  • the power supply includes a full bridge topology circuit and a control circuit, wherein the control circuit includes a logic control circuit, a feedforward circuit, and a feedback circuit.
  • the control circuit includes a logic control circuit, a feedforward circuit, and a feedback circuit.
  • the primary side of the switching transistors Q1, Q2, Q3, Q4 and the transformer Tx and the input voltage Vin form a full-bridge topology circuit, the drain of Q1 is connected to the positive pole of Vin, the source is connected to the drain of Q4 through the primary side of Tx, and the source of Q4 is connected to Vin.
  • the negative pole and the ground form a diagonal bridge arm of the full bridge; the drain of Q2 is connected to the positive pole of Vin, the source passes through the negative pole of the primary side of Tx and the drain of the positive pole is connected to the drain of Q3, and the source of Q3 is connected to the negative pole of Vin and the ground to form Another diagonal bridge arm of the full bridge.
  • the secondary side of Tx is connected to the switching tubes S1 and S2 to form a full-wave rectifying circuit, and the center tap of the secondary side of Tx is grounded through the inductor L0 and the resistor RL, so that the intermediate tap voltage of the secondary winding can charge the capacitor C0 and then pass through the logic control circuit.
  • the switching transistor SC1 of the control feedforward circuit is periodically discharged, thereby generating an input voltage representative of the power supply, and respectively corresponding to the sawtooth waves of the two bridge arms of the full bridge topology circuit, the different slopes of the sawtooth wave corresponding to different inputs of the power supply Voltage.
  • the two bridge arms of the full-bridge topology circuit are alternately turned on, and the currents of the two bridge arms may be inconsistent, resulting in an asymmetric impedance of the two bridge arms being alternately turned on, thereby causing the two bridge arms to work.
  • the duty cycle is asymmetrical
  • the transformer is biased.
  • the feedforward circuit is used to use the sawtooth wave as a feedforward control signal
  • the logic control circuit is used to match and match the feedback control signal of the sawtooth wave signal to the feedback circuit to obtain feedforward performance while preventing partial deviation. magnetic.
  • the secondary side of the transformer Tx in the full-bridge topology circuit can form a double current rectifying circuit with the switching tubes S3, S4, S5 and S6, and one output end of the double current rectifying circuit passes
  • the resistor RGND is grounded, the other output terminal charges the capacitor C0 through the inductor L0, and the switching transistor SC1 of the feedforward circuit is controlled to periodically discharge through the logic control circuit, thereby generating an input voltage capable of characterizing the power supply, and respectively corresponding to the full bridge topology circuit.
  • the sawtooth waves corresponding to the two bridge arms have different slopes corresponding to different input voltages of the power source.
  • the feedforward circuit is used to use the sawtooth wave as a feedforward control signal, and the logic control circuit is used to modulate and match the sawtooth wave signal to the feedback control signal of the feedback circuit to obtain feedforward performance while preventing bias.
  • the logic control circuit specifically includes: a comparison circuit, configured to compare the feedforward control signal and the feedback control signal, and match the compared signal output to obtain the full bridge topology circuit switch tube Control signal
  • a switching tube control circuit configured to adjust a control signal of the switch circuit of the full-bridge topology circuit, so that a duty ratio of two primary arm working on the primary side is matched, and a symmetric or long-term matching is performed in one switching cycle of the logic control circuit, Prevent the transformer from being biased.
  • the switch control circuit can be specifically configured to:
  • Adjusting a control signal of the two bridge arm switches in a switching cycle of the logic control circuit based on a center tap voltage sampled by the feedforward circuit during a first half cycle, so that the second bridge arm is in the second half
  • the duty cycle of the periodic operation is the same as the duty cycle of the first bridge arm during the first half cycle
  • the logic control circuit is based on the sampling of the feedforward circuit during the first half cycle a middle tap voltage, adjusting a control signal of the two bridge arm switches, so that a duty ratio of the second bridge arm working in the second half period is the same as a duty ratio of the first bridge arm operating in the first half period;
  • the logic control circuit does not adjust the control of the second bridge arm switch tube signal.
  • the switch tube control circuit is specifically configured to:
  • the logic control circuit is based on the feedforward circuit a middle tap voltage sampled in a second half of a cycle, adjusting a control signal of the first bridge arm switch, a duty ratio of the first bridge arm operating in a first half cycle of the second cycle, and the second The duty cycle of the bridge arms operating during the second half of the first cycle is the same.
  • FIG. 3 is a schematic flowchart of an embodiment of a power management method according to the present invention. The method is used to suppress input disturbance of a power supply and eliminate bias in a power supply. Referring to FIG. 1 or FIG. 2, the power supply may be referred to.
  • the system includes a full-bridge topology circuit and a control circuit
  • the control circuit includes a logic control circuit, a feedforward circuit, and a feedback circuit
  • the secondary side of the full-bridge topology circuit adopts a full-wave rectifier circuit or a double-current rectifier circuit
  • the feedforward The circuit is configured to sample the intermediate tap voltage of the full-wave rectifying circuit or the voltage of the output of the current-doubler rectifying circuit, and charge the capacitor by using the intermediate tap voltage or the voltage of the output of the current-doubler rectifying circuit, and pass the logic control circuit Controlling a feedforward circuit switch tube to periodically discharge a capacitance in the feedforward circuit to generate a sawtooth wave representative of an input voltage of the power supply and corresponding to two bridge arms of the full bridge topology circuit, the sawtooth wave being different The slope corresponds to a different input voltage of the power supply; the feedforward circuit uses the sawtooth wave as a feedforward control signal.
  • the power management method is to use the logic control circuit to modulate and match the sawtooth signal to the feedback control signal of the feedback circuit to obtain feedforward performance while preventing biasing; The following steps:
  • the feedforward control signal and the feedback control signal are compared by the logic control circuit, and the compared signal output is matched to obtain a control signal of the full bridge topology circuit switch.
  • the two bridge arms include a first bridge arm and a second bridge arm, and the first bridge arm is turned on during a first half cycle of a switching cycle of the logic control circuit, the second bridge The arm is turned on during the second half of one switching cycle of the logic control circuit.
  • the division of the first half period and the second half period is relative. For example, if 1ms-10ms is divided into one period, 5ms-10ms is the second half of the period; if 5ms-15ms is divided into one period, then 5ms -10ms is the first half of the cycle.
  • the logic control circuit adjusts a control signal of the switch of the full-bridge topology circuit, so that the duty ratios of the two bridge arms of the primary side are matched, and one switching cycle of the logic control circuit Internal symmetry or long-term matching, which can include:
  • the duty ratio of the second bridge arm operating in the second half period is greater than the duty ratio of the first bridge arm operating in the first half period, sampling by the logic control circuit in the first half period based on the feedforward circuit a middle tap voltage or a voltage of the output terminal of the current-sense rectification circuit sampled by the feedforward circuit during the first half cycle, adjusting a control signal of the second bridge arm switch tube, so that the second bridge arm is in the second half
  • the duty cycle of the periodic operation is the same as the duty cycle of the first bridge arm operating in the first half cycle; if the duty cycle of the second bridge arm operating in the second half cycle is less than the operation of the first bridge arm in the first half cycle The duty cycle does not adjust the control signal of the full-bridge topology circuit switch.
  • the logic control circuit adjusts a control signal of the switch of the full-bridge topology circuit, so that the duty ratios of the two bridge arms of the primary side are matched, and one switching cycle of the logic control circuit Internal symmetry or long-term matching, which can include:
  • the logic control circuit is based on the feedforward circuit in the first half a mid-sampling voltage of the periodic sampling or a voltage of the output of the rectified output of the current-fed rectifying circuit sampled by the feedforward circuit in the first half cycle, adjusting a control signal of the first bridge arm switch tube, so that the first bridge arm is at The duty cycle of the first half cycle of the second cycle is the same as the duty cycle of the second bridge arm operating during the second half of the first cycle.
  • FIG. 4-7 is a matching logic diagram of an embodiment of a power management method according to the present invention.
  • the fault signal is the middle tap voltage of the full-wave rectification circuit sampled by the feedforward circuit or the voltage of the output of the double current rectification circuit, and the high level of the fault signal indicates the overcurrent signal or other fault signal detected by the feedforward circuit;
  • 0A indicates full The duty cycle of the first bridge arm in the bridge topology circuit;
  • 1A represents the duty cycle of the second bridge arm in the full bridge topology circuit;
  • the solid line in the figure indicates that the feedforward circuit does not detect an overcurrent signal or other fault signal
  • the duty ratio of the first bridge arm and the second bridge arm, the dotted line indicates that the feedforward circuit detects an overcurrent signal or other fault signal, the logic control circuit adjusts the control signal of the full bridge topology circuit switch tube, so that the primary side two The duty cycle of the two bridge arms after the duty cycle of the bridge arm is matched.
  • the first bridge arm conducts during the first
  • the logic control circuit controls the first bridge when the fault signal changes to a high level.
  • the arm stops conducting, so that the duty ratio of the first bridge arm working in the first half cycle is reduced, and the logic control circuit adjusts the control signal of the second bridge arm switch tube to make the duty ratio of the second bridge arm work in the second half cycle
  • the duty cycle is the same as that of the first bridge arm during the first half cycle.
  • the logic control circuit controls the first bridge when the fault signal changes to a high level.
  • the arm stops conducting; when the second bridge arm is turned on in the second half cycle, if the duty ratio of the second bridge arm in the second half cycle is smaller than the duty ratio of the first bridge arm in the first half cycle, the logic control circuit does not Adjust the control signal of the second bridge switch tube.
  • the logic control circuit controls the first bridge when the fault signal becomes a high level.
  • the arm stops conducting; when the second bridge arm is turned on in the second half cycle, if the duty ratio of the second bridge arm in the second half cycle is greater than the duty ratio of the first bridge arm in the first half cycle, the logic control circuit adjusts The control signal of the second bridge switch tube is such that the duty cycle of the second bridge arm operating in the second half cycle is the same as the duty cycle of the first bridge arm operating in the first half cycle.
  • the feedforward circuit detects the fault signal, and when the fault signal changes to the high level, the logic control circuit Controlling the second bridge arm to stop conducting; subsequently, when the first bridge arm is turned on during the first half cycle of the second cycle, the logic control circuit adjusts the control signal of the first bridge arm switch tube to make the first bridge arm in the second cycle First half of the week
  • the duty cycle of the duty cycle is the same as the duty cycle of the second bridge arm operating during the second half of the first cycle.
  • the generated bias magnet may also be corrected by connecting a vertical blocking capacitor in a series on the primary side of the full bridge topology circuit.
  • the control signals of the two bridge arm switches on the primary side of the full-bridge topology circuit are adjusted by the logic control circuit to ensure that the duty ratio of the two bridge arms is in operation. Symmetrical or long-term matching in one switching cycle of the logic control circuit, thereby eliminating the biasing generated in the transformer, suppressing the input disturbance of the power supply and avoiding the requirement of obtaining good feedforward performance and quickly responding to changes in the input voltage
  • the power transformer is biased to ensure that the power supply is working properly.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

提供了一种电源管理方法及电源。该方法包括：通过逻辑控制电路将前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到全桥拓扑电路开关管的控制信号（S301）；通过逻辑控制电路调整全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁（S302）。该电源管理方法及电源可获取良好的前馈性能，抑制输入扰动，并同时避免变压器偏磁，确保电源正常工作。

Description

一种电源管理方法及电源
本发明要求2014年6月20日提交中国专利局、申请号为201410281443.2，发明名称为“一种电源管理方法及电源”的在先专利申请的优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及电子技术领域，尤其涉及一种电源管理方法及电源。
背景技术
数字电源控制器可用于输出恒定电压的电源，通常会遇到输入扰动和输出扰动。为了使能够消除输入扰动，通常使用前馈技术，实现方法也有多种方式，纯数字前馈等等；或者采用峰值电流模式控制，但是峰值电流模式由于对于负载动态调节是反逻辑的(即当负载电流增大时、占空比反而减小)，为满足动态需求则会影响到前馈的敏感度，进而降低对输入扰动的抑制能力，因而在输出扰动抑制和输入扰动抑制之间很难平衡。隔离电源应用中，为便于通讯及输出电流检测、输出电压反馈，通常控制器放在副边，因此各种前馈方式会遇到输入电压检测的问题，尤其是采用数字前馈采样点设置更是一个艰难选择。
发明内容
本发明实施例所要解决的技术问题在于，提供一种电源管理方法及电源。可获取良好的前馈性能，抑制输入扰动，并同时消除电源中的偏磁，保护变压器，确保电源正常工作。
本发明实施例第一方面提供了一种电源管理方法，用于抑制电源的输入扰动并避免电源变压器偏磁，所述电源包括全桥拓扑电路和控制电路，其中所述控制电路包括逻辑控制电路、前馈电路和反馈电路，所述全桥拓扑电路的副边采用全波整流电路，所述前馈电路用于采样所述全波整流电路的中间抽头电压，利用所述中间抽头电压对前馈电路中的电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性放电，以生成表征所述电源的输 入电压，且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号；所述电源管理方法包括：通过所述逻辑控制电路、将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；具体为：
通过所述逻辑控制电路将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
结合第一方面，在第一种可能的实现方式中，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，包括：
在所述逻辑控制电路的一个开关周期内，通过所述逻辑控制电路基于所述前馈电路在前半周期采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则通过所述逻辑控制电路基于所述前馈电路在所述一个开关周期内采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则不通过所述逻辑控制电路调整所述第二桥臂开关管的控制信号。
结合第一方面，在第二种可能的实现方式中，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导 通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，包括：
在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则通过所述逻辑控制电路基于所述前馈电路在所述第一周期的后半周期中采样的中间抽头电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
结合第一方面或第一方面的第一或第二种可能的实现方式，在第三种可能的实现方式中，所述全桥拓扑电路的副边还可以采用倍流整流电路，所述前馈电路用于采样所述倍流整流电路整流后输出端的电压，利用所述倍流整流电路整流后输出端的电压对前馈电路中的电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性放电，以生成表征所述电源的输入电压，且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号；所述电源管理方法包括：通过所述逻辑控制电路、将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；具体为：
通过所述逻辑控制电路将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
结合第一方面的第三种可能的实现方式，在第四种可能的实现方式中，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述通过所述逻辑控制电路调整所述全桥拓扑电路开关管 的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，包括：
在所述逻辑控制电路的一个开关周期内，通过所述逻辑控制电路基于所述前馈电路在前半周期采样的所述倍流整流电路整流后输出端的电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则通过所述逻辑控制电路基于所述前馈电路在前半周期内采样的所述倍流整流电路整流后输出端的电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则不通过所述逻辑控制电路调整所述第二桥臂开关管的控制信号。
结合第一方面的第三种可能的实现方式，在第五种可能的实现方式中，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，包括：
在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则通过所述逻辑控制电路基于所述前馈电路在所述第一周期的后半周期中采样的所述倍流整流电路整流后输出端的电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
结合第一方面以及第一方面的第一至第五种可能的实现方式，在第六种可能的实现方式中，所述方法还包括：
在所述全桥拓扑电路变压器原边与变压器串联隔直电容，辅助纠正偏磁。
本发明实施例第二方面提供一种电源，用于抑制电源的输入扰动并避免电源变压器偏磁，所述电源包括全桥拓扑电路和控制电路，其中所述控制电路包括逻辑控制电路、前馈电路和反馈电路，所述全桥拓扑电路的副边采用全波整流电路，所述前馈电路用于采样所述全波整流电路的中间抽头电压，利用所述中间抽头电压对前馈电路中的电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性放电，以生成表征所述电源的输入电压，且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号；所述逻辑控制电路用于将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；所述逻辑控制电路具体包括：
比较电路，用于将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
开关管控制电路，用于调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
结合第二方面，在第一种可能的实现方式中，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述开关管控制电路具体用于：
在所述逻辑控制电路的一个开关周期内，基于所述前馈电路在前半周期采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则所述逻辑控制电路基于所述前馈电路在前半周期内采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则所述逻辑控制电路不调整所述第二桥臂开关管的控制信号。
结合第二方面，在第二种可能的实现方式中，所述两个桥臂包括第一桥臂 和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述开关管控制电路具体用于：
在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则所述逻辑控制电路基于所述前馈电路在所述第一周期的后半周期中采样的中间抽头电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
结合第二方面，在第三种可能的实现方式中，所述所述全桥拓扑电路的副边还可以采用倍流整流电路，所述前馈电路用于采样所述倍流整流电路整流后输出端的电压，利用所述倍流整流电路整流后输出端的电压对前馈电路中的电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性放电，以生成表征所述电源的输入电压，且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号；所述逻辑控制电路用于将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；所述逻辑控制电路具体包括：
比较电路，用于将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
开关管控制电路，用于调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
结合第二方面的第三种可能的实现方式，在第四种可能的实现方式中，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述开关管控制电路具体用于：
在所述逻辑控制电路的一个开关周期内，基于所述前馈电路在前半周期采 样的所述倍流整流电路整流后输出端的电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则基于所述前馈电路在前半周期内采样的所述倍流整流电路整流后输出端的电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则不调整所述第二桥臂开关管的控制信号。
结合第二方面的第三种可能的实现方式，在第五种可能的实现方式中，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述开关管控制电路具体用于：
在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则基于所述前馈电路在所述第一周期的后半周期中采样的所述倍流整流电路整流后输出端的电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
实施本发明实施例，具有如下有益效果：
基于前馈电路采样到的全桥拓扑电路副边输出的电压，通过逻辑控制电路调整全桥拓扑电路原边两个桥臂开关管的控制信号，确保两个桥臂工作的占空比在所述逻辑控制电路的一个开关周期内对称或长期匹配，从而消除变压器中产生的偏磁，在确保获取良好的前馈性能、可快速响应输入电压变化的前提下，可抑制电源的输入扰动并避免电源变压器偏磁，确保电源正常工作。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明电源的一实施例的电路示意图；
图2是本发明电源的另一实施例的电路示意图；
图3是本发明电源管理方法的一实施例的流程示意图；
图4是本发明电源管理方法的一种匹配逻辑图；
图5是本发明电源管理方法的另一种匹配逻辑图；
图6是本发明电源管理方法的又一种匹配逻辑图；
图7是本发明电源管理方法的又一种匹配逻辑图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
图1为本发明电源的一实施例的电路示意图，如图1所示，电源包括全桥拓扑电路和控制电路，其中控制电路包括逻辑控制电路、前馈电路和反馈电路。开关管Q1、Q2、Q3、Q4以及变压器Tx的原边与输入电压Vin组成全桥拓扑电路，Q1漏极接Vin正极，源极通过Tx的原边接Q4的漏极，Q4源极接Vin的负极和地，形成全桥的一个对角桥臂；Q2的漏极接Vin正极，源极通过Tx原边的负极和正极接Q3的漏极，Q3源极接Vin的负极和地，形成全桥的另一个对角桥臂。Tx的副边与开关管S1、S2连接成全波整流电路，Tx副边的中间抽头通过电感L0和电阻RL接地，这样副边绕组的中间抽头电压便可以对电容C0充电，然后通过逻辑控制电路控制前馈电路的开关管SC1周期性放电，从而产生可表征电源的输入电压，且分别与全桥拓扑电路的两个桥臂对应的锯齿波，该锯齿波不同的斜率对应于电源不同的输入电压。现有技术中，全桥拓扑电路的两个桥臂交替导通，两个桥臂所承担的电流可能不一致，导致两个桥臂交替导通的阻抗不对称，从而引起两个桥臂工作的占空比不对称，从而 使得变压器产生偏磁。现有的伪峰值前馈模式虽然可以很快的反应输入电压的变化，但是却容易引起偏磁，且产生的偏磁也无法校正。本发明实施例中，前馈电路用于将该锯齿波作为前馈控制信号，逻辑控制电路用于将该锯齿波信号调制反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁。
作为一种可行的实施方式，如图2所示，全桥拓扑电路中变压器Tx的副边可与开关管S3、S4、S5和S6形成倍流整流电路，倍流整流电路的一个输出端通过电阻RGND接地，另一个输出端通过电感L0给电容C0充电，并通过逻辑控制电路控制前馈电路的开关管SC1周期性放电，从而产生可表征电源的输入电压，且分别与全桥拓扑电路的两个桥臂对应的锯齿波，该锯齿波不同的斜率对应于电源不同的输入电压。前馈电路用于将该锯齿波作为前馈控制信号，逻辑控制电路用于将该锯齿波信号调制反馈电路的反馈控制信号并匹配，以获得前馈性能的同时防止偏磁。
本发明实施例中，逻辑控制电路具体包括：比较电路，用于将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
开关管控制电路，用于调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
在一些可行的实施方式中，所述开关管控制电路可具体用于：
在所述逻辑控制电路的一个开关周期内，基于所述前馈电路在前半周期采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则所述逻辑控制电路基于所述前馈电路在前半周期内采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则所述逻辑控制电路不调整所述第二桥臂开关管的控制信号。
在一些可行的实施方式中，所述开关管控制电路具体用于：
在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则所述逻辑控制电路基于所述前馈电路在所述第一周期的后半周期中采样的中间抽头电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
请参照图3，为本发明电源管理方法的一实施例的流程示意图，所述方法用于抑制电源的输入扰动并消除电源中的偏磁，可一并参照图1或图2，所述电源包括全桥拓扑电路和控制电路，所述控制电路包括逻辑控制电路、前馈电路和反馈电路，其中所述全桥拓扑电路的副边采用全波整流电路或倍流整流电路，所述前馈电路用于采样所述全波整流电路的中间抽头电压或所述倍流整流电路输出端的电压，利用所述中间抽头电压或所述倍流整流电路输出端的电压对电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性放电，以生成表征所述电源的输入电压且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号。
在本实施例中，该电源管理方法为通过所述逻辑控制电路、将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；具体可包括以下步骤：
S301，通过所述逻辑控制电路将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号。
S302，通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
本发明实施例中，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通。需要说明的是，本发明实施例中 前半周期和后半周期的划分是相对的，举例来说，若将1ms-10ms划分为一个周期，则5ms-10ms为该周期的后半周期；若将5ms-15ms划分为一个周期，则5ms-10ms为该周期的前半周期。
作为一种可行的实施方式，所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，可包括：
在所述逻辑控制电路的一个开关周期内，通过所述逻辑控制电路，基于所述前馈电路在前半周期采样的中间抽头电压或所述前馈电路在前半周期采样的所述倍流整流电路整流后输出端的电压，调整所述第二桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则通过所述逻辑控制电路，基于所述前馈电路在前半周期采样的中间抽头电压或所述前馈电路在前半周期采样的所述倍流整流电路整流后输出端的电压，调整所述第二桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则不调整所述全桥拓扑电路开关管的控制信号。
作为一种可行的实施方式，所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，可包括：
在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则通过所述逻辑控制电路，基于所述前馈电路在前半周期采样的中间抽头电压或所述前馈电路在前半周期采样的所述倍流整流电路整流后输出端的电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
请结合图4-7，为本发明电源管理方法的一实施例的匹配逻辑图。其中fault信号为前馈电路采样到的全波整流电路的中间抽头电压或倍流整流电路输出端的电压，fault信号高电平表示前馈电路检测到的过流信号或其他故障信号；0A表示全桥拓扑电路中第一桥臂工作的占空比；1A表示全桥拓扑电路中第二桥臂工作的占空比；图中实线表示前馈电路没有检测到过流信号或其他故障信号时第一桥臂和第二桥臂工作的占空比，虚线表示前馈电路检测到过流信号或其他故障信号时，逻辑控制电路调整全桥拓扑电路开关管的控制信号，使原边两个桥臂工作的占空比匹配后该两个桥臂工作的占空比。在逻辑控制电路的一个开关周期内，第一桥臂在前半周期导通，第二桥臂在后半周期导通。
作为一种可行的实施方式，如图4所示，在前半周期第一桥臂导通时，若前馈电路检测到故障信号，在fault信号变为高电平时，逻辑控制电路控制第一桥臂停止导通，使得第一桥臂在前半周期工作的占空比减小，同时逻辑控制电路调整第二桥臂开关管的控制信号，使第二桥臂在后半周期工作的占空比与第一桥臂在前半周期工作的占空比相同。
作为一种可行的实施方式，如图5所示，在前半周期第一桥臂导通时，若前馈电路检测到故障信号，在fault信号变为高电平时，逻辑控制电路控制第一桥臂停止导通；在后半周期第二桥臂导通时，若第二桥臂在后半周期工作的占空比小于第一桥臂在前半周期工作的占空比，则逻辑控制电路不调整第二桥臂开关管的控制信号。
作为一种可行的实施方式，如图6所示，在前半周期第一桥臂导通时，若前馈电路检测到故障信号，在fault信号变为高电平时，逻辑控制电路控制第一桥臂停止导通；在后半周期第二桥臂导通时，若第二桥臂在后半周期工作的占空比大于第一桥臂在前半周期工作的占空比，则逻辑控制电路调整第二桥臂开关管的控制信号，使第二桥臂在后半周期工作的占空比与第一桥臂在前半周期工作的占空比相同。
作为一种可行的实施方式，如图7所示，在第一周期的后半周期第二桥臂导通时，前馈电路检测到故障信号，在fault信号变为高电平时，逻辑控制电路控制第二桥臂停止导通；随后，在第二周期的前半周期第一桥臂导通时，逻辑控制电路调整第一桥臂开关管的控制信号，使第一桥臂在第二周期的前半周 期工作的占空比与第二桥臂在第一周期的后半周期工作的占空比相同。
本发明实施例中，还可以通过在所述全桥拓扑电路的原边串联隔直电容来对产生的偏磁进行校正。
基于前馈电路采样到的全桥拓扑电路副边输出的电压，通过逻辑控制电路调整全桥拓扑电路原边两个桥臂开关管的控制信号，确保两个桥臂工作的占空比在所述逻辑控制电路的一个开关周期内对称或长期匹配，从而消除变压器中产生的偏磁，在确保获取良好的前馈性能、可快速响应输入电压变化的前提下，可抑制电源的输入扰动并避免电源变压器偏磁，确保电源正常工作。
需要说明的是，本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，简称ROM)或随机存储记忆体(Random Access Memory，简称RAM)等。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。

Claims (14)

  1. 一种电源管理方法，用于抑制电源的输入扰动并避免电源变压器偏磁，其特征在于，所述电源包括全桥拓扑电路和控制电路，其中所述控制电路包括逻辑控制电路、前馈电路和反馈电路，所述全桥拓扑电路的副边采用全波整流电路，所述前馈电路用于采样所述全波整流电路的中间抽头电压，利用所述中间抽头电压对前馈电路中的电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性放电，以生成表征所述电源的输入电压，且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号；所述电源管理方法包括：通过所述逻辑控制电路、将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；具体为：
    通过所述逻辑控制电路将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
    通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
  2. 如权利要求1所述的方法，其特征在于，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，包括：
    在所述逻辑控制电路的一个开关周期内，通过所述逻辑控制电路基于所述前馈电路在前半周期采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
    若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期 工作的占空比，则通过所述逻辑控制电路基于所述前馈电路在前半周期内采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
    若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则不通过所述逻辑控制电路调整所述第二桥臂开关管的控制信号。
  3. 如权利要求1所述的方法，其特征在于，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，包括：
    在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则通过所述逻辑控制电路基于所述前馈电路在所述第一周期的后半周期中采样的中间抽头电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
  4. 如权利要求1所述的方法，其特征在于，所述全桥拓扑电路的副边还可以采用倍流整流电路，所述前馈电路用于采样所述倍流整流电路整流后输出端的电压，利用所述倍流整流电路整流后输出端的电压对前馈电路中的电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性放电，以生成表征所述电源的输入电压，且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号；所述电源管理方法包括：通过所述逻辑控制电路、将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；具体为：
    通过所述逻辑控制电路将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
    通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
  5. 如权利要求4所述的方法，其特征在于，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，包括：
    在所述逻辑控制电路的一个开关周期内，通过所述逻辑控制电路基于所述前馈电路在前半周期采样的所述倍流整流电路整流后输出端的电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
    若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则通过所述逻辑控制电路基于所述前馈电路在前半周期内采样的所述倍流整流电路整流后输出端的电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
    若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则不通过所述逻辑控制电路调整所述第二桥臂开关管的控制信号。
  6. 如权利要求4所述的方法，其特征在于，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述通过所述逻辑控制电路调整所述全桥拓扑电路开关管的控制信号，使得原边两 个桥臂工作的占空比匹配，包括：
    在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则通过所述逻辑控制电路基于所述前馈电路在所述第一周期的后半周期中采样的所述倍流整流电路整流后输出端的电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
  7. 如权利要求1-6任一项所述的方法，其特征在于，所述方法还包括：
    在所述全桥拓扑电路变压器原边与变压器串联隔直电容，辅助纠正偏磁。
  8. 一种电源，用于抑制电源的输入扰动并避免电源变压器偏磁，其特征在于，所述电源包括全桥拓扑电路和控制电路，其中所述控制电路包括逻辑控制电路、前馈电路和反馈电路，所述全桥拓扑电路的副边采用全波整流电路，所述前馈电路用于采样所述全波整流电路的中间抽头电压，利用所述中间抽头电压对前馈电路中的电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性放电，以生成表征所述电源的输入电压，且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号；所述逻辑控制电路用于将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；所述逻辑控制电路具体包括：
    比较电路，用于将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
    开关管控制电路，用于调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
  9. 如权利要求8所述的电源，其特征在于，所述两个桥臂包括第一桥臂 和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述开关管控制电路具体用于：
    在所述逻辑控制电路的一个开关周期内，基于所述前馈电路在前半周期采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
    若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则所述逻辑控制电路基于所述前馈电路在前半周期内采样的中间抽头电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
    若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则所述逻辑控制电路不调整所述第二桥臂开关管的控制信号。
  10. 如权利要求8所述的电源，其特征在于，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述开关管控制电路具体用于：
    在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则所述逻辑控制电路基于所述前馈电路在所述第一周期的后半周期中采样的中间抽头电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
  11. 如权利要求6所述的电源，其特征在于，所述所述全桥拓扑电路的副边还可以采用倍流整流电路，所述前馈电路用于采样所述倍流整流电路整流后输出端的电压，利用所述倍流整流电路整流后输出端的电压对前馈电路中的电容充电，并通过逻辑控制电路控制前馈电路开关管对前馈电路中的电容周期性 放电，以生成表征所述电源的输入电压，且分别与所述全桥拓扑电路的两个桥臂对应的锯齿波，所述锯齿波不同的斜率对应于所述电源不同的输入电压；所述前馈电路将所述锯齿波作为前馈控制信号；所述逻辑控制电路用于将所述锯齿波信号调制所述反馈电路的反馈控制信号并匹配，以获得前馈性能并同时防止偏磁；所述逻辑控制电路具体包括：
    比较电路，用于将所述前馈控制信号和反馈控制信号进行比较，并将比较后的信号输出进行匹配后得到所述全桥拓扑电路开关管的控制信号；
    开关管控制电路，用于调整所述全桥拓扑电路开关管的控制信号，使得原边两个桥臂工作的占空比匹配，在所述逻辑控制电路的一个开关周期内对称或者长期匹配，防止变压器偏磁。
  12. 如权利要求11所述的电源，其特征在于，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所述开关管控制电路具体用于：
    在所述逻辑控制电路的一个开关周期内，基于所述前馈电路在前半周期采样的所述倍流整流电路整流后输出端的电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；或者
    若所述第二桥臂在后半周期工作的占空比大于所述第一桥臂在前半周期工作的占空比，则基于所述前馈电路在前半周期内采样的所述倍流整流电路整流后输出端的电压，调整所述两个桥臂开关管的控制信号，使所述第二桥臂在后半周期工作的占空比与所述第一桥臂在前半周期工作的占空比相同；
    若所述第二桥臂在后半周期工作的占空比小于所述第一桥臂在前半周期工作的占空比，则不调整所述第二桥臂开关管的控制信号。
  13. 如权利要求11所述的电源，其特征在于，所述两个桥臂包括第一桥臂和第二桥臂，所述第一桥臂在所述逻辑控制电路的一个开关周期的前半周期导通，所述第二桥臂在所述逻辑控制电路的一个开关周期的后半周期导通，所 述开关管控制电路具体用于：
    在所述逻辑控制电路的相邻两个开关周期内，其中所述逻辑控制电路的相邻两个开关周期按照时间由先到后分别为第一周期和第二周期，若所述第一桥臂在第二周期的前半周期工作的占空比小于所述第二桥臂在第一周期的后半周期工作的占空比，则基于所述前馈电路在所述第一周期的后半周期中采样的所述倍流整流电路整流后输出端的电压，调整所述第一桥臂开关管的控制信号，使所述第一桥臂在第二周期的前半周期工作的占空比与所述第二桥臂在第一周期的后半周期工作的占空比相同。
  14. 如权利要求8-13任一项所述的电源，其特征在于，所述电源还包括：
    隔直电容，所述隔直电容在所述全桥拓扑电路变压器原边与所述变压器串联，用于辅助纠正偏磁。
PCT/CN2015/070137 2014-06-20 2015-01-06 一种电源管理方法及电源 Ceased WO2015192650A1 (zh)

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