WO2017193474A1 - Circuit de compensation de boucle, circuit d'alimentation de commutation et chargeur d'alimentation de commutation - Google Patents

Circuit de compensation de boucle, circuit d'alimentation de commutation et chargeur d'alimentation de commutation Download PDF

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Publication number
WO2017193474A1
WO2017193474A1 PCT/CN2016/090474 CN2016090474W WO2017193474A1 WO 2017193474 A1 WO2017193474 A1 WO 2017193474A1 CN 2016090474 W CN2016090474 W CN 2016090474W WO 2017193474 A1 WO2017193474 A1 WO 2017193474A1
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WIPO (PCT)
Prior art keywords
circuit
input
voltage
feedback
loop
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Ceased
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PCT/CN2016/090474
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English (en)
Chinese (zh)
Inventor
潘加龙
郑鲁杰
陈庆威
毛玉鸿
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • H02M1/123—Suppression of common mode 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

  • This paper relates to but not limited to the field of switching power supply technology, and in particular relates to a loop compensation circuit, a switching power supply circuit and a switching power supply charger.
  • the traditional RCC (Ringing choke convertor) charger has the advantages of simple control mode and low price; self-excited oscillation does not require external clock control, and no auxiliary power supply is required; the disadvantage is: low efficiency The noise is very large, and now the charger in the mobile phone field basically no longer uses this technology.
  • the existing mobile phone charger has a reasonable solution for the control of the input voltage range, output voltage and output power under stable grid voltage conditions.
  • the output power is greatly improved compared to the traditional RCC circuit.
  • the embodiment of the invention provides a loop compensation circuit, a switching power supply circuit and a switching power supply charger, which are used for solving the stable output and transient state of the converter system under the condition of fluctuation or load change of the grid voltage in the related art.
  • the ability to respond and the linear adjustment of the load are not much improved to improve the output stability of the charging circuit, the ability of the transient response, and the linear regulation of the load.
  • an embodiment of the present invention provides a loop compensation circuit, including: a main power circuit and a feedback control circuit with voltage outer loop feedback and current inner loop feedback;
  • the main power circuit performs step-down and voltage ripple filtering on the input DC power; the feedback control circuit adjusts the output voltage of the main power circuit and feeds back to the input end of the main power circuit.
  • the main power circuit includes: a single-ended flyback conversion circuit and a rectifier circuit;
  • the single-ended flyback converter circuit steps down the input DC power, and the rectifier circuit performs voltage ripple filtering on the stepped DC power and outputs the voltage.
  • the rectifier circuit is a rectifier diode and a filter circuit or a synchronous rectifier drive circuit.
  • the feedback control circuit includes: a detection feedback circuit, an error amplification circuit, an isolation circuit, a current detection circuit, a PWM (Pulse Width Modulation) control, and a driving circuit;
  • the detection feedback circuit, the error amplification circuit and the isolation circuit are sequentially connected, and the output voltage of the main power circuit is input to the error amplification circuit through the detection feedback circuit, and the output voltage signal of the error amplification circuit is input to the isolation circuit to realize voltage outer loop feedback adjustment;
  • the current signal outputted in the circuit is input to the current detecting circuit and compared with the current of the primary side of the transformer in the single-ended flyback conversion circuit, and the driving signal is input to the PWM control and driving circuit to control the transformer in the single-ended flyback conversion circuit.
  • the switching tube on the primary side line is turned on and off to achieve current inner loop regulation.
  • the isolation circuit is an optical isolator or an isolation transformer.
  • the detection feedback circuit includes: a tenth resistor R10, an eleventh resistor R11, and a capacitor Ce2;
  • the tenth resistor R10 is divided in series with the eleventh resistor R11 to output an output voltage to the error amplifier; the capacitor Ce2 is connected in parallel with the tenth resistor R10 to form an advance compensation feedback circuit.
  • an embodiment of the present invention further provides a switching power supply circuit, including a common mode filtering and rectifying circuit, a high precision current regulating switch, a single or multiple output circuit, and the above loop compensation circuit;
  • the common mode filtering and rectifying circuit is connected between the input voltage and the input end of the loop compensating circuit, and the high precision current regulating switch is connected between the output end of the loop compensating circuit and the single or multiple output circuits.
  • the circuit further includes: a USB port adaptation circuit, the USB port adaptation circuit being connected between the loop compensation circuit output end and the single or multiple output circuits.
  • the circuit further includes an input protection circuit, the input protection circuit being located between the AC input and the common mode filtering and rectifying circuit.
  • the input protection circuit includes: a fuse FUSE, a negative temperature coefficient thermistor RNTC, and a varistor RCB, wherein the fuse FUSE and the negative temperature coefficient thermistor RNTC are connected in series to the AC input terminal, the varistor The RCB is connected in parallel to the AC input.
  • the circuit further includes a clamp circuit formed by the first voltage transient suppression diode D2, the second voltage transient suppression diode D3, and the third resistor R3; the clamp circuit is connected to the single-ended flyback The input of the transformer in the conversion circuit.
  • the circuit further includes an electrostatic discharge ESD protection device, and each of the output circuits is correspondingly provided with an ESD protection device.
  • an embodiment of the present invention further provides a switching power supply charger, including the above switching power supply circuit.
  • the loop compensation circuit provided by the embodiment of the invention adopts a voltage external loop feedback and a current inner loop feedback feedback control circuit to feedback control the output voltage, thereby improving the output stability and transient response capability of the loop compensation circuit. And the linear adjustment rate of the load, thereby improving the charging efficiency of the switching power supply charger.
  • FIG. 1 is a schematic diagram of hysteresis compensation of a switching power supply loop compensation network according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of advanced compensation of a switching power supply loop compensation network according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of lead-lag compensation of a switching power supply loop compensation network according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a small signal model of a switching power supply system according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a loop compensation circuit according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram of a loop compensation circuit according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic diagram of a circuit of a switching power supply circuit according to an embodiment of the present invention.
  • FIG. 8 is a circuit diagram of a switching power supply circuit according to an embodiment of the present invention.
  • FIG. 9 is a phase diagram of a switching power supply circuit according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of output transient response of a switching power supply circuit according to an embodiment of the present invention.
  • the switching power supply relies on a feedback control loop to ensure that the required voltage and current are obtained under different load conditions.
  • a stable feedback loop is critical to switching power supplies. The design of the feedback loop affects many factors, including the dynamic response of the system, the ability to adjust the load voltage, and stability.
  • the feedback control loop When the feedback control loop has a loop gain of unity gain or higher at a certain frequency and the total phase delay is 360°, the feedback control loop will oscillate, causing the system output to be unstable. If a stable and non-oscillating effect is to be obtained, the frequency response of the loop gain transfer function has a gain of 0 dB at the gain crossing frequency f c , and the slope of the curve is -20 dB/dec, and the phase shift cannot be lower than -180°. Or -360°, that is, the phase margin is greater than zero. Generally, the gain margin of the switching power supply system can be satisfied.
  • the feedback loop provides the best dynamic response to the system when the phase margin exceeds 45 degrees, damping oscillations and shortening transient regulation time.
  • the root of the characteristic equation F(s) with zero denominator in the transfer function or the zero pole generated by the denominator of the closed-loop transfer function directly affects the stability of the system and the magnitude of the phase margin. The following is an analysis of the zero-pole characteristics of the switching power converter system to establish a small-signal dynamic model of the entire system to provide guidance for loop compensation design.
  • Fig. 1 Shown in Fig. 1 is a switching power converter lead compensation control scheme, in which the feedback voltage dividing network 101 performs voltage division detection on the output voltage of the converter system, and divides the voltage and inputs it into the error amplifier for comparison with its reference voltage.
  • the feedback network if the pure resistors R1 and R2 are used for voltage division, the transfer function H(s) of the feedback voltage divider network is still constant and will not change with the frequency.
  • the method of connecting the capacitor C2 through the resistor R1 can make the system reach The effect of advanced compensation.
  • the error amplifier and the loop compensation network 102 are calculated by comparing V c (s) with V 1 (s), and it is found that the zero position of the error amplifier and the loop compensation network transfer function G 1 (s) is closer to the pole position than the pole position.
  • the origin, and the phase of the output signal in its Bode plot is ahead of the phase of the input signal, then the loop compensation control system is advanced.
  • Leading compensation can increase the bandwidth of the system, increase the transient response time of the system, and increase the crossing frequency of the low-frequency gain of the system.
  • the disadvantage is that it is susceptible to external noise interference, and the gain compensation capability at low frequencies is limited.
  • Figure 2 shows the switching power converter lag compensation control scheme.
  • the capacitor C2 connected in parallel with the resistor R2 in the feedback voltage dividing network 201 can make the system achieve the effect of hysteresis compensation.
  • the error amplifier and loop compensation network 202 by comparing the V c (s) with V 1 (s), it is found that the pole position of the transfer function G 1 (s) is closer to the origin than the zero position, and its porter The phase of the output signal in the figure lags behind the phase of the input signal, so the loop compensation control system is hysteresis compensation.
  • Hysteresis compensation can improve the system's ability to suppress high-frequency noise. The disadvantage is that it reduces the transient response time of the system.
  • Shown in Figure 3 is the switching power converter lag-lead compensation control scheme.
  • the capacitors C4 and C5 are respectively connected in parallel with the resistors R1 and R2 to achieve the hysteresis-lead compensation of the system.
  • different capacitance values are used, so that the calculated pole-zero point can be applied to the system.
  • the loop is compensated.
  • the error amplifier and the loop compensation network 302 are calculated by comparing V c (s) with V 1 (s), and it is found that the two zeros of the transfer function G 1 (s) are contained between the two poles, and In the different frequency ranges in the Bode plot, the phase of the output signal is advanced and lags behind the phase of the input signal, so the loop compensation control system is hysteresis-lead compensation.
  • the error amplifier EA in the error amplifier and compensation network 401 uses the feedback input signal VOS to compare with the reference voltage to realize the output of the voltage signal.
  • the optocoupler or the isolation transformer can be used to realize the signal transmission, such as the CTR (current transfer ratio) of the optocoupler, so that the signal can be isolated and transmitted; in the absence of the isolated feedback compensation system
  • the optocoupler or isolation transformer is omitted directly.
  • the output signal is directly input into a PWM driving mode IC (Integrated Circuit) in the PWM modulator 402.
  • the PWM driving mode IC collects the signal on the primary side of the transformer flowing through the source of the switching transistor, thereby adjusting the single-ended flyback conversion.
  • the peak current in the primary side of the transformer, the inductance Lm, Lp realizes the storage and transmission of the primary and secondary energy of the transformer.
  • the feedback voltage dividing network 404 indicates that the filtered output voltage is compensated by the voltage division feedback of Rs1 and Rs2, and then input into the error amplifier to realize the loop compensation control of the entire converter system.
  • the flyback switching power supply in the power switch mode converter is relatively simple and inexpensive, and the transformer in the flyback switching power supply is used for energy storage, and the output terminal does not need to use an additional inductor. It also has one output diode less than the forward converter. Therefore, the flyback switching power supply is particularly suitable for small charging devices. In order to stabilize the system output and reduce interference, loop compensation is essential for switching power supplies.
  • the loop compensation circuit provided in the present invention is designed.
  • the loop compensation circuit provided in the first embodiment of the present invention is shown in FIG. 5.
  • the loop compensation circuit includes a main power circuit 501 and a feedback control circuit 502 having voltage outer loop feedback and current inner loop feedback;
  • the main power circuit 501 performs step-down and voltage ripple filtering on the input DC power; the feedback control circuit 502 adjusts the output voltage of the main power circuit 501 and feeds back to the input terminal of the main power circuit.
  • the loop compensation circuit provided by the embodiment of the invention adopts a feedback control circuit of voltage external loop feedback and current inner loop feedback, and feedback control is performed on the output voltage to improve the output of the loop compensation circuit. Stability, transient response capability, and linear regulation of the load increase the charging efficiency of the switching power supply charger.
  • the main power circuit includes: a single-ended flyback conversion circuit 601, a rectifier circuit 602;
  • the single-ended flyback converter circuit 601 steps down the input DC power, and the rectifier circuit 602 performs voltage ripple filtering on the stepped DC power and outputs the voltage.
  • the rectifier circuit is a rectifier diode and a filter circuit or a synchronous rectifier drive circuit. As long as the function of rectification and voltage ripple filtering can be realized. However, a synchronous rectification drive circuit is generally used. The reason is that the rectifier diode is passively controlled, and its own voltage drop is large, so the power consumption is large; the synchronous rectification drive circuit belongs to the active monitoring and control transformer secondary side output voltage, and the switch tube belongs to the voltage type control chip, and the drive current is much smaller than the diode, so its The power consumption is small and almost negligible.
  • the synchronous rectification drive circuit automatically controls the switch tube Q2 according to the voltage on the secondary side (sub-side) output circuit of the detection transformer to realize low-loss switch control and improve the charging efficiency.
  • the feedback control circuit includes: a detection feedback circuit 603, an error amplification circuit 604, an isolation circuit 605, a current detection circuit 606, a PWM (Pulse Width Modulation) control and a drive circuit 607;
  • the detection feedback circuit 603, the error amplification circuit 604, and the isolation circuit 605 are sequentially connected, and the output voltage of the main power circuit is input to the error amplification circuit 604 via the detection feedback circuit 603, and the output voltage signal of the error amplification circuit 604 is input to the isolation circuit 605.
  • Voltage external loop feedback adjustment; the current signal outputted from the isolation circuit 605 is input to the current detection circuit 606 and compared with the current on the primary side of the transformer in the single-ended flyback conversion circuit 601, and the drive signal is input to the PWM control and drive circuit 607.
  • the turn-on and turn-off of the switch tube on the primary side line of the transformer in the single-ended flyback conversion circuit 601 is controlled to implement current inner loop adjustment.
  • the above isolation circuit is an optical isolator or an isolation transformer.
  • the detection feedback circuit is a lead compensation feedback circuit.
  • the embodiment of the invention also provides a switching power supply circuit, as shown in FIGS. 7 and 8.
  • the switching power supply circuit includes a common mode filtering and rectifying circuit 708, a high precision current regulating switch 709, a single or multiple output circuit 710, and a loop compensation circuit as described in the foregoing embodiments.
  • the common mode filtering and rectifying circuit 708 is connected between the input voltage and the input end of the loop compensating circuit to filter out common mode interference noise from the grid line and the switching power supply, and convert the alternating current into a loop behind the direct current supply. Compensation circuit.
  • the high precision current regulating switch 709 is connected between the output of the loop compensation circuit and the single or multiple output circuit 710 to provide a reasonable current value for the single or multiple output circuits.
  • the common control loop L1 is used to filter out the interference clutter.
  • the coil is in the coil.
  • the same magnetic field will be generated to increase the inductive reactance of the coil, thereby attenuating the common mode current and suppressing the electromagnetic wave generated by the high-speed signal from being emitted outward, thereby achieving the filtering effect.
  • the filtered AC voltage is passed through rectifier Z1 for DC output for subsequent use.
  • the switching power supply circuit further includes: a USB port adaptation circuit 711; the USB port adaptation circuit 711 is connected between the loop compensation circuit output terminal and the single or multiple output circuit 711.
  • the USB adapter is mainly used to identify external USB devices, automatically monitor the voltage on the USB data line, and provide correct electrical characteristics on the data line.
  • the switching power supply circuit provided by the present application is applicable to the input of a wide range (85V to 265V) of alternating current in the world.
  • an input protection circuit is provided at the AC input end.
  • the input protection circuit comprises: a fuse FUSE, a negative temperature coefficient thermistor R NTC , a varistor R CB , the fuse FUSE and a negative temperature coefficient thermistor R NTC are connected in series to the AC input terminal, and the varistor R CB is connected in parallel At the AC input. Selecting the delay type fuse will reduce the rated current of the fuse as much as possible; the negative temperature coefficient thermistor with the characteristic value decreasing with the temperature rise on the line will increase the line impedance, which can effectively suppress the generation at the time of starting. Surge current formed by the surge voltage; the incorporated varistor is used to suppress the overvoltage generated by the input to protect the latter circuit.
  • the circuit also includes The first voltage transient suppression diode D2, the second voltage transient suppression diode D3, and the third resistor R3 form a series clamp circuit 801; the clamp circuit is connected to the input end of the transformer in the single-ended flyback converter circuit.
  • the output voltage is directly input to the current limiting adjustment switch U3 and the charging adapter U4, and the dual channel current limiting adjustment switch provides an adjustable charging current of 250 mA to 2.8 A and a charging of 5 V for the peripheral.
  • the charging adapter automatically detects the D+, D- signal voltage on the USB port line and automatically provides the correct electrical characteristics on the data line.
  • the circuit further includes an ESD (Electro-Static discharge) protection device, and each of the output circuits is provided with an ESD protection device.
  • the ESD device is connected to the USB port V+, D+, D- signal lines to prevent static electricity.
  • U5 and U6 act as ESD protection devices for the USB charging output port, and can be used as general protection devices.
  • the stability of the system is analyzed according to the Bode plot of the system, and then the feedback network is compensated.
  • the voltage outputted from the secondary side of the transformer T1 is divided and detected by the resistors R10 and R11 in the feedback voltage dividing network 802, and then input to the reference chip in the error amplifier and compensation network 803, and compared with the reference voltage of the reference chip itself to generate control.
  • the signal is transmitted through the optocoupler OC1 for current feedback.
  • the current signal outputted by the optocoupler is input to the peak current control chip U1 to generate a driving signal to control the power tube Q1, thereby realizing the adjustment of the energy storage and release of the primary side of the transformer T1, that is, adjusting the output voltage.
  • the synchronous secondary rectification driver U2 replaces the traditional diode on the secondary side voltage output line of the transformer.
  • the synchronous rectification driver automatically detects the voltage on the secondary side of the transformer, realizes automatic control of the power tube Q2 on and off, and reduces the output of the switching power supply.
  • the rectification loss and the heat of the power supply itself increase the conversion efficiency.
  • an embodiment of the present invention further provides a switching power supply charger including the above-described switching power supply circuit.
  • Figure 9 shows the phase-and-phase diagram of the switching power supply charger loop compensation system. It can be seen from the figure that the converter system has a magnitude margin of 20dB and a phase margin of 65.9°, which satisfies the system. Stability design requirements.
  • Figure 10 shows the output transient response of the switching power supply charger. As the input voltage drops from 220V to 210V, after the loop compensation, the system quickly reaches a stable 5V output, and its response time is controlled within 30us. The transient response time is much higher than that of a conventional switching power supply charger.
  • Table 1 shows the output power meter of the switching power supply charger. It can be seen from the data table that the output power of the system after loop compensation reaches about 86%, which satisfies the high efficiency output.
  • the input is 85 ⁇ 265V AC input; the output voltage is 5V; the dual output current is 2.5A; R10 is 10K; R11 is 10K; Ce1 is 2uF; Ce2 is 0.1uF; Ce3 is 22nF; Ce4 It is 100nF; Re1 is 30K; Re2 is 6 ⁇ ; Re3 is 390 ⁇ ; U2 uses UCC24610 chip, power tube Q2 uses low internal resistance CSD16556Q chip, reference voltage chip adopts ATL431BQ, optocoupler adopts VOS617 chip.
  • the loop compensation circuit provided by the embodiment of the invention adopts a voltage external loop feedback and a current inner loop feedback feedback control circuit to feedback control the output voltage, thereby improving the output stability and transient response capability of the loop compensation circuit. And the linear adjustment rate of the load, thereby improving the charging efficiency of the switching power supply charger.
  • the loop compensation circuit provided by the embodiment of the invention adopts a voltage external loop feedback and a current inner loop feedback feedback control circuit to feedback control the output voltage, thereby improving the output stability and transient response capability of the loop compensation circuit. And the linear adjustment rate of the load, thereby improving the charging efficiency of the switching power supply charger.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un circuit de compensation de boucle, un circuit d'alimentation de commutation et un chargeur d'alimentation de commutation. Le circuit de compensation de boucle comprend : un circuit d'alimentation principal (501) ; un circuit de commande à réaction (502) ayant une boucle à rétroaction de tension externe et une boucle à rétroaction de courant interne. Le circuit d'alimentation principal effectue une opération d'abaissement et un filtrage d'ondulation de tension sur un courant continu fourni en entrée. Après la régulation, par le circuit de commande à rétroaction, de la tension fournie par le circuit d'alimentation principal, la tension régulée est renvoyée au circuit d'alimentation principal depuis une borne d'entrée de ce dernier.
PCT/CN2016/090474 2016-05-13 2016-07-19 Circuit de compensation de boucle, circuit d'alimentation de commutation et chargeur d'alimentation de commutation Ceased WO2017193474A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610318868.5A CN107370399A (zh) 2016-05-13 2016-05-13 一种环路补偿电路、开关电源电路及开关电源充电器
CN201610318868.5 2016-05-13

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WO2017193474A1 true WO2017193474A1 (fr) 2017-11-16

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PCT/CN2016/090474 Ceased WO2017193474A1 (fr) 2016-05-13 2016-07-19 Circuit de compensation de boucle, circuit d'alimentation de commutation et chargeur d'alimentation de commutation

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WO (1) WO2017193474A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109039093A (zh) * 2018-09-29 2018-12-18 杰华特微电子（杭州）有限公司 隔离式开关电源及其控制方法
CN110739853A (zh) * 2018-07-20 2020-01-31 上海棱式工业科技有限公司 一种开关电源及充电器
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CN110955290A (zh) * 2019-12-13 2020-04-03 北京大华无线电仪器有限责任公司 用于高精度大功率变换器的智能型温度补偿装置
CN113075445A (zh) * 2020-01-06 2021-07-06 广州汽车集团股份有限公司 高压器件纹波保护方法、电路、电子控制器及存储介质
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