WO2019015215A1 - 直流电压变换电路及直流电压变换方法和液晶显示装置 - Google Patents

直流电压变换电路及直流电压变换方法和液晶显示装置 Download PDF

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Publication number
WO2019015215A1
WO2019015215A1 PCT/CN2017/114389 CN2017114389W WO2019015215A1 WO 2019015215 A1 WO2019015215 A1 WO 2019015215A1 CN 2017114389 W CN2017114389 W CN 2017114389W WO 2019015215 A1 WO2019015215 A1 WO 2019015215A1
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Prior art keywords
current
gate
electrically connected
module
circuit
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Ceased
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PCT/CN2017/114389
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English (en)
French (fr)
Inventor
李文芳
曹丹
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to KR1020207004797A priority Critical patent/KR102222198B1/ko
Priority to EP17918457.7A priority patent/EP3657491A4/en
Priority to US16/615,363 priority patent/US10819230B2/en
Priority to JP2020501451A priority patent/JP6889326B2/ja
Publication of WO2019015215A1 publication Critical patent/WO2019015215A1/zh
Anticipated expiration legal-status Critical
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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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0204—Compensation of DC component across the pixels in flat panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • 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
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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 display technologies, and in particular, to a DC voltage conversion circuit, a DC voltage conversion method, and a liquid crystal display device.
  • LCD liquid crystal display
  • the liquid crystal panel is a core component of the liquid crystal display device.
  • the liquid crystal panel usually consists of a color filter substrate (CF Substrate), a thin film transistor array substrate (Thin Film Transistor Array Substrate, TFT Array Substrate), and a liquid crystal layer (Liquid Crystal Layer) disposed between the two substrates. ) constitutes.
  • a pixel electrode and a common electrode are respectively disposed on the array substrate and the color filter substrate. When a voltage is applied to the pixel electrode and the common electrode, an electric field is generated in the liquid crystal layer, which determines the orientation of the liquid crystal molecules, thereby adjusting the polarization of light incident on the liquid crystal layer, so that the liquid crystal panel displays an image.
  • the input to the TFT-LCD includes an analog power supply voltage (VAA), a digital power supply voltage (VDD), a gate turn-on voltage (VGH), and a gate turn-off voltage (VGL).
  • VAA analog power supply voltage
  • VDD digital power supply voltage
  • VGH gate turn-on voltage
  • VGL gate turn-off voltage
  • VAA and VDD are large, usually generated by a boost circuit or a buck circuit, and the currents corresponding to VGH and VGL are small, generally using a lower cost charge pump (Charge) Pump) circuit to generate.
  • Charge charge pump
  • the Boost circuit of the VAA is used for boosting the input voltage to generate the VAA, and is also used to generate the driving voltage VLX for boosting the charge pump circuit that drives the VGH, and is generated by the VOA Boost circuit.
  • the driving voltage VLX has the following drawbacks: When the load on the VAA is small (ie, light load), the VOA Boost circuit enters the discontinuous mode, and the switching frequency of the driving voltage VLX generated by the VAA boost circuit also becomes Very low, as shown in Figure 1, if the load on the VGH is heavy at this time, the driving voltage VLX with a very low switching frequency will not drive the VGH to drive the load stably, so that the voltage of the VGH cannot be stabilized, which affects normal operation.
  • An object of the present invention is to provide a DC voltage conversion circuit capable of automatically adjusting a switching frequency of a switching module according to the load of the boosting circuit and the charge pump circuit to ensure normal operation of the charge pump circuit.
  • Another object of the present invention is to provide a DC voltage conversion method capable of automatically adjusting the switching frequency of a switch module according to the load weight of the booster circuit and the charge pump circuit to ensure normal operation of the charge pump circuit.
  • Another object of the present invention is to provide a liquid crystal display device capable of automatically adjusting the switching frequency of the switch module according to the load of the booster circuit and the charge pump circuit to ensure normal operation of the charge pump circuit.
  • the present invention provides a DC voltage conversion circuit including: a booster circuit, a charge pump circuit, and a control circuit;
  • the boosting circuit includes: an inductor, a first diode, and a first capacitor;
  • the charge pump circuit includes: a second capacitor, a third capacitor, a second diode, a third diode, and a triode;
  • the control circuit includes: a switch module, an AND gate, a first current detecting module, a second current detecting module, a boost control module, and a charge pump control module;
  • the first end of the inductor is connected to the input voltage, the second end is electrically connected to the first node; the anode of the first diode is electrically connected to the first node, and the anode outputs an analog power supply voltage; The first end is electrically connected to the negative pole of the first diode, the second end is grounded; the first end of the second capacitor is electrically connected to the first node, and the second end is electrically connected to the negative pole of the second diode; The positive electrode of the second diode is electrically connected to the negative electrode of the first diode; the positive electrode of the third diode is electrically connected to the negative electrode of the second diode, and the negative electrode is electrically connected to the first end of the third capacitor The second end of the third capacitor is grounded; the base of the triode is electrically connected to the charge pump control module, the emitter is electrically connected to the cathode of the third diode, and the collector output gate is turned on;
  • the control end of the switch module is electrically connected to the first end of the boost control module, the first end is electrically connected to the first node, and the second end is grounded; the second end of the boost control module is electrically connected to the gate Output
  • the first current detecting module is configured to collect a first current, and when the first current is greater than a preset first comparison current, provide a low level to the first input end of the AND gate, When the first current is less than the preset first comparison current, providing a high level to the first input end of the AND gate; the first current is a current of the second end of the switch module;
  • the second current detecting module is configured to collect a second current, and when the second current is greater than a preset second comparing current, provide a high level to the second input end of the AND gate, When the second current is less than the preset second comparison current, providing a low level to the second input end of the AND gate; the second current is a current of the collector of the transistor;
  • the boost control module is configured to control opening and closing of the switch module, and control a switching frequency of the switch module according to a level of an output end of the AND gate, when a level of an output of the AND gate is low Level, the boost control module controls the switch module to maintain a current switching frequency, and when the level of the output of the AND gate is a high level, the boost control module controls the switch module to raise a current switch frequency;
  • the charge pump control module is configured to control the on and off of the triode.
  • the first current detecting module includes: a first current comparator, and an inverter;
  • the non-inverting input end of the first current comparator is electrically connected to the second end of the switch module, the inverting input end is connected to the first comparison current, and the output end is electrically connected to the input end of the inverter; the inverter is The output is electrically connected to the first input of the door.
  • the second current detecting module includes: a second current comparator
  • the non-inverting input terminal of the second current comparator is electrically connected to the collector of the triode, the inverting input terminal is connected to the second reference current, and the output end is electrically connected to the second input end of the gate.
  • the control circuit is integrated in a power management chip.
  • the first diode, the second diode, and the third diode are both Schottky diodes.
  • the switch module includes: a MOS tube, and a resistor;
  • the gate of the MOS transistor is electrically connected to the boost control module, the source is electrically connected to the first end of the resistor, the drain is electrically connected to the first node; and the second end of the resistor is grounded;
  • the gate of the MOS transistor is a control end of the switch module, the drain is a first end of the switch module, and the second end of the resistor is a second end of the switch module.
  • the invention provides a DC voltage conversion method applied to the above DC voltage conversion circuit, comprising the following steps:
  • Step S1 the boost control module repeatedly switches the switch module, and the boost circuit boosts an input voltage to obtain an analog power voltage
  • Step S2 the charge pump circuit boosts the analog power supply voltage by using a voltage of the first node to generate a gate turn-on voltage, the charge pump control module controls the transistor to be turned on, and the gate is turned on. a voltage is output from the collector of the triode;
  • Step S3 the first current detecting module collects a first current, and when the first current is greater than a preset first comparing current, provides a low level to the first input end of the AND gate. When the first current is less than the preset first comparison current, providing a high level to the first input end of the AND gate; the first current is a current of the second end of the switch module;
  • Step S4 the second current detecting module collects a second current, and when the second current is greater than a preset second comparing current, provides a high level to the second input end of the AND gate. Providing low power to the second input of the AND gate when the second current is less than the preset second comparison current Flat; the second current is a current of the collector of the triode;
  • Step S5 the boost control module receives the level of the output end of the AND gate, and the level of the output end of the AND gate is a low level, and controls the switch module to maintain the current switching frequency.
  • the level of the output of the gate is high, and the switch module is controlled to increase the current switching frequency.
  • the present invention also provides a liquid crystal display device comprising the above-described DC voltage conversion circuit.
  • the present invention provides a DC voltage conversion circuit including: a boosting circuit, a charge pump circuit, and a control circuit, wherein the first current detecting module and the second current detecting module are added to the control circuit. And an AND gate, detecting a first current in the boost circuit through the first current detecting module, and providing a high level or a low level to the first input end of the AND gate according to the magnitude of the first current.
  • the second current detecting module detects the second current in the charge pump circuit, and supplies a high level or a low level to the second input end of the AND gate according to the magnitude of the second current, and utilizes the output of the AND gate
  • the level control switch module of the terminal increases the switching frequency when the first current is small and the second current is large, that is, the boost circuit is lightly loaded and the charge pump circuit is heavy, thereby improving the boost circuit to be provided to the charge pump circuit.
  • the driving capability of the driving voltage ensures the normal operation of the charge pump circuit and improves the stability of the VGH voltage.
  • the invention also provides a DC voltage conversion method, which can automatically adjust the switching frequency of the switch module according to the load weight of the booster circuit and the charge pump circuit to ensure the normal operation of the charge pump circuit.
  • the invention also provides a liquid crystal display device capable of automatically adjusting the switching frequency of the switch module according to the load of the boosting circuit and the charge pump circuit to ensure the normal operation of the charge pump circuit.
  • FIG. 1 is a waveform diagram of a driving voltage VLX when a booster circuit in a prior art is in a discontinuous mode
  • Figure 2 is a circuit diagram of a DC voltage conversion circuit of the present invention
  • FIG. 3 is a waveform diagram of a driving voltage VLX when the boosting circuit is in a light load and the charge pump circuit is under heavy load in the DC voltage conversion circuit of the present invention
  • FIG. 4 is a flow chart of a DC voltage conversion method of the present invention.
  • the present invention provides a DC voltage conversion circuit including a booster circuit 1, a charge pump circuit 2, and a control circuit 3.
  • the booster circuit 1 includes an inductor L1, a first diode D1, and a first capacitor C1.
  • the charge pump circuit 2 includes a second capacitor C2, a third capacitor C3, and a second diode D2.
  • the control circuit 3 includes: a switch module 301, an AND gate Y1, a first current detecting module 201, a second current detecting module 202, a boost control module 101, and Charge pump control module 102.
  • the first end of the inductor L1 is connected to the input voltage Vin, the second end is electrically connected to the first node A; the anode of the first diode D1 is electrically connected to the first node A, and the negative output is an analog power supply.
  • a voltage VAA a voltage VAA; a first end of the first capacitor C1 is electrically connected to a cathode of the first diode D1, and a second end is grounded; a first end of the second capacitor C2 is electrically connected to the first node A, and a second
  • the second electrode D2 is electrically connected to the negative electrode of the second diode D2; the positive electrode of the second diode D2 is electrically connected to the negative electrode of the first diode D1;
  • the anode of the diode D2 is electrically connected to the first end of the third capacitor C3; the second end of the third capacitor C3 is grounded; the base of the transistor Tr1 is electrically connected to the charge pump control module 102, the emitter The negative electrode of the third diode D3 is electrically connected, and the collector outputs a gate-on voltage VGH.
  • control end of the switch module 301 is electrically connected to the first end of the boost control module 101, the first end is electrically connected to the first node A, the second end is grounded, and the second end of the boost control module 101 is The terminal is electrically connected to the output of the gate Y1.
  • the first current detecting module 201 is configured to collect a first current, and provide a low level to the first input end of the AND gate Y1 when the first current is greater than a preset first comparison current. When the first current is less than the preset first comparison current, providing a high level to the first input end of the AND gate Y1; the first current is a current of the second end of the switch module 301;
  • the second current detecting module 202 is configured to collect a second current, and provide a high level to the second input end of the AND gate Y1 when the second current is greater than a preset second comparison current. When the second current is less than the preset second comparison current, providing a low level to the second input end of the AND gate Y1; the second current is a current of the collector of the transistor Tr1;
  • the boost control module 101 is configured to control the opening and closing of the switch module 301, and control the switching frequency of the switch module 301 according to the level of the output end of the AND gate Y1, when the output of the AND gate Y1 The level of the terminal is low, the boost control module 101 controls the switch module 301 to maintain the current switching frequency, and when the level of the output of the AND gate Y1 is high, the boost control module 101 Controlling the switch module 301 to increase a current switching frequency;
  • the charge pump control module 102 is configured to control the on and off of the transistor Tr1.
  • the first current detecting module 201 includes: a first current comparator U1 and an inverter F1; and a positive phase input terminal of the first current comparator U1 is electrically connected to the switch
  • the second end of the module 301, the inverting input terminal is connected to the first comparison current I1, and the output end is electrically connected to the input end of the inverter F1; the output end of the inverter F1 is electrically connected to the first of the gate Y1
  • a high level is supplied to the first input of the AND gate Y1.
  • the second current detecting module 202 includes: a second current comparator U2; the non-inverting input end of the second current comparator U2 is electrically connected to the collector of the transistor Tr1, and the inverting input terminal is connected to the second
  • the second reference current I2 is electrically connected to the second input end of the gate Y1, so as to provide the second input terminal of the AND gate Y1 when the second current is greater than the preset second comparison current I2. a high level, when the second current is less than the preset second comparison current I2, providing a low level to the second input of the AND gate Y1.
  • control circuit 3 is integrated in a power management IC (PMIC).
  • PMIC power management IC
  • the first diode D1, the second diode D2, and the third diode D3 are Schottky diodes.
  • the switch module 301 includes: a MOS transistor Q1 and a resistor R1; the gate of the MOS transistor Q1 is electrically connected to the boost control module 101, and the source is electrically connected to the first end of the resistor R1, and the drain is electrically Connected to the first node A; the second end of the resistor R1 is grounded; correspondingly, the gate of the MOS transistor is the control end of the switch module 301, and the drain is the first end of the switch module 301, The second end of the resistor R1 is the second end of the switch module 301.
  • the DC voltage conversion circuit of the present invention operates in the following manner: first, the boost control module 101 controls the switch module 301 to be turned on, and the first diode D1 is turned off. The current of the inductor L1 continues to increase, and the inductor L1 stores energy. Then, the boost control module 101 controls the switch module 301 to be turned off, the first diode D1 is turned on, and the inductor L1 is passed through the first diode D1.
  • a capacitor C1 is charged, thereby completing the boosting of the input voltage Vin, outputting the analog power supply voltage VAA, repeatedly switching the switch module 301 to continuously output the analog power supply voltage VAA, and at the same time, the charge pump circuit 2 is obtained from the first node A.
  • the current voltage conversion circuit detects the first current and the second current during the operation of the boosting circuit 1 and the charge pump circuit 2, and according to the first current and the second current The size of the boost circuit 1 and the charge pump circuit 2 is determined.
  • the boost circuit 1 when the first current is greater than the preset first comparison current I1, the boost circuit 1 is determined to be in a heavy load state. Going into the discontinuous mode, providing a low level to the first input end of the AND gate Y1, and determining that the boost circuit 1 is in a light load state when the first current is less than the preset first comparison current I1 And entering a discontinuous mode, providing a high level to the first input end of the AND gate Y1, and the charge pump circuit 2 is in a heavy load state when the second current is greater than the preset second comparison current I2 a driving voltage VLX requiring a strong driving capability, providing a high level to the second input terminal of the AND gate Y1, and the charge pump circuit 2 when the second current is less than the preset second comparison current I2 In the light load state, a driving voltage VLX that does not require a strong driving capability is supplied to the second input terminal of the AND gate Y1, and the boost control module 101 is in accordance with the level of the output terminal of the AND gate Y1.
  • the boost control module 101 controls the switch module 301 to increase the current switching frequency to Raising the driving capability of the driving voltage VLX to ensure that the VGH can stably drive the load, when the level of the output terminal of the AND gate Y1 is low, that is, except that the boosting circuit 1 is in a light load state and the electric charge
  • the boost control module 101 controls the switch module 301 to maintain the current switching frequency. At this time, the VGH can also stably drive the load, so that the present invention can be based on the boost circuit. 1 and the load of the charge pump circuit 2 lightly and automatically adjust the switching frequency of the switch module to ensure the normal operation of the charge pump circuit.
  • the present invention further provides a DC voltage conversion method, which is applied to the DC voltage conversion circuit described above, and includes the following steps:
  • Step S1 the boost control module 101 repeatedly switches the switch module 301, the boost circuit 1 boosts the input voltage Vin to obtain an analog power supply voltage VAA;
  • Step S2 the charge pump circuit 2 boosts the analog power supply voltage VAA by using the voltage of the first node A to generate a gate-on voltage VGH, and the charge pump control module 102 controls the transistor Tr1. Passing, the gate-on voltage VGH is output from the collector of the transistor Tr1;
  • Step S3 the first current detecting module 201 collects a first current, and provides a low level to the first input end of the AND gate Y1 when the first current is greater than a preset first comparison current. Providing a high level to a first input end of the AND gate Y1 when the first current is less than a preset first comparison current; the first current is a current of the second end of the switch module 301;
  • Step S4 the second current detecting module 202 collects a second current, and provides a high level to the second input end of the AND gate Y1 when the second current is greater than a preset second comparison current.
  • the second current is less than the preset second comparison current, to the second input of the AND gate Y1 Providing a low level; the second current is a current of the collector of the transistor Tr1;
  • Step S5 the boost control module 101 receives the level of the output end of the AND gate Y1, and the level of the output end of the AND gate Y1 is a low level, and controls the switch module 301 to maintain the current switching frequency.
  • the level of the output of the AND gate Y1 is at a high level, and the switch module 301 is controlled to increase the current switching frequency.
  • the present invention provides a liquid crystal display device comprising the above-described DC voltage conversion circuit.
  • the present invention provides a DC voltage conversion circuit including: a boosting circuit, a charge pump circuit, and a control circuit, wherein the first current detecting module and the second current detecting module are added to the control circuit.
  • an AND gate detecting a first current in the boost circuit through the first current detecting module, and providing a high level or a low level to the first input end of the AND gate according to the magnitude of the first current.
  • the second current detecting module detects the second current in the charge pump circuit, and provides a high level or a low level to the second input end of the AND gate according to the magnitude of the second current, using the output end of the AND gate
  • the level control switch module increases the switching frequency when the first current is small and the second current is large, that is, the boost circuit is lightly loaded and the charge pump circuit is heavy, thereby improving the driving of the boost circuit to the charge pump circuit.
  • the driving capability of the voltage ensures the normal operation of the charge pump circuit and improves the stability of the VGH voltage.
  • the invention also provides a DC voltage conversion method, which can automatically adjust the switching frequency of the switch module according to the load weight of the booster circuit and the charge pump circuit to ensure the normal operation of the charge pump circuit.
  • the invention also provides a liquid crystal display device capable of automatically adjusting the switching frequency of the switch module according to the load of the boosting circuit and the charge pump circuit to ensure the normal operation of the charge pump circuit.

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Abstract

公开了一种直流电压变换电路及直流电压变换方法和液晶显示装置。电路包括：升压电路1、电荷泵电路2、及控制电路3，控制电路3中增设有第一电流侦测模块201、第二电流侦测模块202、及与门Y1，通过第一电流侦测模块201侦测升压电路1中的第一电流I1，并根据第一电流I1的大小向与门Y1的第一输入端提供高电平或低电平，通过第二电流侦测模块I2侦测电荷泵电路2中的第二电流I2，并根据第二电流I2的大小向与门Y1的第二输入端提供高电平或低电平，利用与门Y1的输出端的电平控制开关模块301在第一电流I1较小且第二电流I2较大即升压电路1为轻载且电荷泵电路2为重载时提升开关模块301的开关频率，保证电荷泵电路2的正常工作，提升VGH电压的稳定性。

Description

直流电压变换电路及直流电压变换方法和液晶显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种直流电压变换电路及直流电压变换方法和液晶显示装置。
背景技术
随着显示技术的发展，液晶显示装置(Liquid Crystal Display，LCD)等平面显示装置因具有高画质、省电、机身薄及应用范围广等优点，而被广泛的应用于手机、电视、个人数字助理、数字相机、笔记本电脑、台式计算机等各种消费性电子产品，成为显示装置中的主流。
液晶面板是液晶显示装置的核心组成部分。液晶面板通常是由一彩色滤光片基板(Color Filter Substrate，CF Substrate)、一薄膜晶体管阵列基板(Thin Film Transistor Array Substrate，TFT Array Substrate)以及一配置于两基板间的液晶层(Liquid Crystal Layer)所构成。一般阵列基板、彩色滤光片基板上分别设置像素电极、公共电极。当电压被施加到像素电极与公共电极便会在液晶层中产生电场，该电场决定了液晶分子的取向，从而调整入射到液晶层的光的偏振，使液晶面板显示图像。
现有技术中对TFT-LCD进行驱动时，均会向TFT-LCD输入包括模拟电源电压(VAA)、数字电源电压(VDD)、栅极开启电压(VGH)、栅极关闭电压(VGL)在内的多种电压。其中，VAA和VDD的电流较大，通常是通过升压(Boost)电路或降压(Buck)电路来产生的，而VGH及VGL对应的电流较小，一般利用成本较低的电荷泵(Charge Pump)电路来产生。
具体地，在现有技术，VAA的Boost电路除了用于对输入电压进行升压产生VAA外，还用于对产生驱动VGH的电荷泵电路进行升压的驱动电压VLX，通过VAA的Boost电路产生驱动电压VLX存在如下缺陷：当VAA上的负载较小(即轻载)时，VAA的Boost电路会进入断续模式，此时由VAA的boost电路产生的驱动电压VLX的切换频率也会变得很低，如图1所示，如果此时VGH上的负载较重，这种切换频率很低的驱动电压VLX将不能稳定的驱动VGH带动负载，使得VGH的电压不能稳定，影响正常工作。
发明内容
本发明的目的在于提供一种直流电压变换电路，能够根据升压电路和电荷泵电路的负载轻重自动调整开关模块的开关频率，保证电荷泵电路的正常工作。
本发明的另一目的在于提供一种直流电压变换方法，能够根据升压电路和电荷泵电路的负载轻重自动调整开关模块的开关频率，保证电荷泵电路的正常工作。
本发明的另一目的还在于提供一种液晶显示装置，能够根据升压电路和电荷泵电路的负载轻重自动调整开关模块的开关频率，保证电荷泵电路的正常工作。
为实现上述目的，本发明提供了一种直流电压变换电路，包括：升压电路、电荷泵电路、及控制电路；
所述升压电路包括：电感、第一二极管、及第一电容；所述电荷泵电路包括：第二电容、第三电容、第二二极管、第三二极管、及三极管；所述控制电路包括：开关模块、与门、第一电流侦测模块、第二电流侦测模块、升压控制模块、及电荷泵控制模块；
所述电感的第一端接入输入电压，第二端电性连接第一节点；所述第一二极管的正极电性连接第一节点，负极输出模拟电源电压；所述第一电容的第一端电性连接第一二极管的负极，第二端接地；所述第二电容的第一端电性连接第一节点，第二端电性连接第二二极管的负极；所述第二二极管的正极电性连接第一二极管的负极；所述第三二极管的正极电性连接第二二极管的负极，负极电性连接第三电容的第一端；所述第三电容的第二端接地；所述三极管的基极电性连接电荷泵控制模块，发射极电性连接第三二极管的负极，集电极输出栅极导通电压；
所述开关模块的控制端电性连接升压控制模块的第一端，第一端电性连接第一节点，第二端接地；所述升压控制模块的第二端电性连接与门的输出端；
所述第一电流侦测模块用于采集第一电流，并在所述第一电流大于预设的第一比较电流时，向所述与门的第一输入端提供低电平，在所述第一电流小于预设的第一比较电流时，向所述与门的第一输入端提供高电平；所述第一电流为所述开关模块第二端的电流；
所述第二电流侦测模块用于采集第二电流，并在所述第二电流大于预设的第二比较电流时，向所述与门的第二输入端提供高电平，在所述第二电流小于预设的第二比较电流时，向所述与门的第二输入端提供低电平；所述第二电流为所述三极管集电极的电流；
所述升压控制模块用于控制所述开关模块的开启和关闭，并根据所述与门的输出端的电平控制所述开关模块的开关频率，当所述与门的输出端的电平为低电平，所述升压控制模块控制所述开关模块维持当前的开关频率，当所述与门的输出端的电平为高电平，所述升压控制模块控制所述开关模块提升当前的开关频率；
所述电荷泵控制模块用于控制所述三极管的通断。
所述第一电流侦测模块包括：第一电流比较器、及反相器；
所述第一电流比较器的正相输入端电性连接开关模块的第二端，反相输入端接入第一比较电流，输出端电性连接反相器的输入端；所述反相器的输出端电性连接与门的第一输入端。
所述第二电流侦测模块包括：第二电流比较器；
所述第二电流比较器的正相输入端电性连接三极管的集电极，反相输入端接入第二参考电流，输出端电性连接与门的第二输入端。
所述控制电路集成于一电源管理芯片中。
所述第一二极管、第二二极管、及第三二极管均为肖特基极二极管。
所述开关模块包括：MOS管、及电阻；
所述MOS管的栅极电性连接升压控制模块，源极电性连接电阻的第一端，漏极电性连接第一节点；所述电阻的第二端接地；
所述MOS管的栅极为所述开关模块的控制端，漏极为所述开关模块的第一端，所述电阻的第二端为所述开关模块的第二端。
本发明提供一种直流电压变换方法，应用于上述的直流电压变换电路，包括如下步骤：
步骤S1、所述升压控制模块反复开关所述开关模块，所述升压电路对输入电压进行升压得到模拟电源电压；
步骤S2、所述电荷泵电路利用第一节点的电压对所述模拟电源电压进行升压，产生栅极导通电压，所述电荷泵控制模块控制所述三极管导通，所述栅极导通电压从所述三极管的集电极输出；
步骤S3、所述第一电流侦测模块采集第一电流，并在所述第一电流大于预设的第一比较电流时，向所述与门的第一输入端提供低电平，在所述第一电流小于预设的第一比较电流时，向所述与门的第一输入端提供高电平；所述第一电流为所述开关模块第二端的电流；
步骤S4、所述第二电流侦测模块采集第二电流，并在所述第二电流大于预设的第二比较电流时，向所述与门的第二输入端提供高电平，在所述第二电流小于预设的第二比较电流时，向所述与门的第二输入端提供低电 平；所述第二电流为所述三极管集电极的电流；
步骤S5、所述升压控制模块接收所述与门的输出端的电平，在所述与门的输出端的电平为低电平，控制所述开关模块维持当前的开关频率，在所述与门的输出端的电平为高电平，控制所述开关模块提升当前的开关频率。
本发明还提供一种液晶显示装置，包括上述的直流电压变换电路。
本发明的有益效果：本发明提供一种直流电压变换电路，包括：升压电路、电荷泵电路、及控制电路，所述控制电路中增设有第一电流侦测模块、第二电流侦测模块、及与门，通过第一电流侦测模块侦测升压电路中的第一电流，并根据第一电流的大小向所述与门的第一输入端提供高电平或低电平，通过第二电流侦测模块侦测电荷泵电路中的第二电流，并根据第二电流的大小向所述与门的第二输入端提供高电平或低电平，利用所述与门的输出端的电平控制开关模块在所述第一电流较小且第二电流较大即升压电路为轻载且电荷泵电路为重载时提升开关频率，从而提升升压电路提供给电荷泵电路的驱动电压的驱动能力，保证电荷泵电路的正常工作，提升VGH电压的稳定性。本发明还提供一种直流电压变换方法，能够根据升压电路和电荷泵电路的负载轻重自动调整开关模块的开关频率，保证电荷泵电路的正常工作。本发明还提供一种液晶显示装置，能够根据升压电路和电荷泵电路的负载轻重自动调整开关模块的开关频率，保证电荷泵电路的正常工作。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为现有技术中的升压电路处于断续模式时驱动电压VLX的波形图；
图2本发明的直流电压变换电路的电路图；
图3为本发明的直流电压变换电路中升压电路处于轻载且电荷泵电路处于重载时的驱动电压VLX的波形图；
图4为本发明的直流电压变换方法的流程图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图1，本发明提供一种直流电压变换电路，包括：升压电路1、电荷泵电路2、及控制电路3。
其中，所述升压电路1包括：电感L1、第一二极管D1、及第一电容C1；所述电荷泵电路2包括：第二电容C2、第三电容C3、第二二极管D2、第三二极管D3、及三极管Tr1；所述控制电路3包括：开关模块301、与门Y1、第一电流侦测模块201、第二电流侦测模块202、升压控制模块101、及电荷泵控制模块102。
具体地，所述电感L1的第一端接入输入电压Vin，第二端电性连接第一节点A；所述第一二极管D1的正极电性连接第一节点A，负极输出模拟电源电压VAA；所述第一电容C1的第一端电性连接第一二极管D1的负极，第二端接地；所述第二电容C2的第一端电性连接第一节点A，第二端电性连接第二二极管D2的负极；所述第二二极管D2的正极电性连接第一二极管D1的负极；所述第三二极管D3的正极电性连接第二二极管D2的负极，负极电性连接第三电容C3的第一端；所述第三电容C3的第二端接地；所述三极管Tr1的基极电性连接电荷泵控制模块102，发射极电性连接第三二极管D3的负极，集电极输出栅极导通电压VGH。
具体地，所述开关模块301的控制端电性连接升压控制模块101的第一端，第一端电性连接第一节点A，第二端接地；所述升压控制模块101的第二端电性连接与门Y1的输出端。
所述第一电流侦测模块201用于采集第一电流，并在所述第一电流大于预设的第一比较电流时，向所述与门Y1的第一输入端提供低电平，在所述第一电流小于预设的第一比较电流时，向所述与门Y1的第一输入端提供高电平；所述第一电流为所述开关模块301第二端的电流；
所述第二电流侦测模块202用于采集第二电流，并在所述第二电流大于预设的第二比较电流时，向所述与门Y1的第二输入端提供高电平，在所述第二电流小于预设的第二比较电流时，向所述与门Y1的第二输入端提供低电平；所述第二电流为所述三极管Tr1集电极的电流；
所述升压控制模块101用于控制所述开关模块301的开启和关闭，并根据所述与门Y1的输出端的电平控制所述开关模块301的开关频率，当所述与门Y1的输出端的电平为低电平，所述升压控制模块101控制所述开关模块301维持当前的开关频率，当所述与门Y1的输出端的电平为高电平，所述升压控制模块101控制所述开关模块301提升当前的开关频率；
所述电荷泵控制模块102用于控制所述三极管Tr1的通断。
优选地，如图2所示，所述第一电流侦测模块201包括：第一电流比较器U1、及反相器F1；所述第一电流比较器U1的正相输入端电性连接开关模块301的第二端，反相输入端接入第一比较电流I1，输出端电性连接反相器F1的输入端；所述反相器F1的输出端电性连接与门Y1的第一输入端，从而实现在所述第一电流大于预设的第一比较电流I1时，向所述与门Y1的第一输入端提供低电平，在所述第一电流小于预设的第一比较电流I1时，向所述与门Y1的第一输入端提供高电平。
优选地，所述第二电流侦测模块202包括：第二电流比较器U2；所述第二电流比较器U2的正相输入端电性连接三极管Tr1的集电极，反相输入端接入第二参考电流I2，输出端电性连接与门Y1的第二输入端，从而实现在所述第二电流大于预设的第二比较电流I2时，向所述与门Y1的第二输入端提供高电平，在所述第二电流小于预设的第二比较电流I2时，向所述与门Y1的第二输入端提供低电平。
具体地，所述控制电路3集成于一电源管理芯片(Power manage IC，PMIC)中。优选地，所述第一二极管D1、第二二极管D2、及第三二极管D3均为肖特基极二极管。
进一步地，所述开关模块301包括：MOS管Q1、及电阻R1；所述MOS管Q1的栅极电性连接升压控制模块101，源极电性连接电阻R1的第一端，漏极电性连接第一节点A；所述电阻R1的第二端接地；对应地，所述MOS管的栅极为所述开关模块301的控制端，漏极为所述开关模块301的第一端，所述电阻R1的第二端为所述开关模块301的第二端。
需要说明的是，结合图1和图3，本发明的直流电压变换电路的工作过程为：首先所述升压控制模块101控制所述开关模块301打开，第一二极管D1截止，所述电感L1的电流持续增加，电感L1储能，随后所述升压控制模块101控制所述开关模块301关闭，第一二极管D1导通，所述电感L1通过第一二极管D1为第一电容C1充电，从而完成对输入电压Vin的升压，输出模拟电源电压VAA，反复开关开关模块301，以持续输出模拟电源电压VAA，与此同时，电荷泵电路2从第一节点A处获得驱动电压VLX，并在通过所述驱动电压VLX对所述模拟电源电压VAA进行升压时产生栅极导通电压VGH，具体为通过所述驱动电压VLX为所述第二电容C2和第三电容C3充电，使得所述第三二极管D3的阴极电压上升，从而产生栅极导通电压VGH，更为重要的是，由于升压电路1在轻载状态下会进入断续模式，本发明的直流电压变换电路在所述升压电路1和电荷泵电路2的工作过程中，还会侦测第一电流和第二电流，并根据第一电流和第二电流的 大小判断所述升压电路1和电荷泵电路2的负载状态，具体为，在所述第一电流大于预设的第一比较电流I1时，判定所述升压电路1为重载状态，不会进入断续模式，向所述与门Y1的第一输入端提供低电平，在所述第一电流小于预设的第一比较电流I1时，判定所述升压电路1为轻载状态，会进入断续模式，向所述与门Y1的第一输入端提供高电平，在所述第二电流大于预设的第二比较电流I2时，所述电荷泵电路2为重载状态，需要较强驱动能力的驱动电压VLX，向所述与门Y1的第二输入端提供高电平，在所述第二电流小于预设的第二比较电流I2时，所述电荷泵电路2为轻载状态，不需要较强驱动能力的驱动电压VLX，向所述与门Y1的第二输入端提供低电平，所述升压控制模块101根据所述与门Y1的输出端的电平控制所述开关模块301的开关频率，当所述与门Y1的输出端的电平为高电平，也即所述升压电路1为轻载状态且所述电荷泵电路2为重载状态时，所述升压控制模块101控制所述开关模块301提升当前的开关频率，以提升所述驱动电压VLX的驱动能力，保证VGH能够稳定带动负载，当所述与门Y1的输出端的电平为低电平，也即除了所述升压电路1为轻载状态且所述电荷泵电路2为重载状态的情况以外，所述升压控制模块101均控制所述开关模块301维持当前的开关频率，此时所述VGH也能够稳定带动负载，从而本发明能够根据升压电路1和电荷泵电路2的负载轻重自动调整开关模块的开关频率，保证电荷泵电路的正常工作。
请参阅图4，本发明还提供一种直流电压变换方法，应用于上述的直流电压变换电路，包括如下步骤：
步骤S1、所述升压控制模块101反复开关所述开关模块301，所述升压电路1对输入电压Vin进行升压得到模拟电源电压VAA；
步骤S2、所述电荷泵电路2利用所述第一节点A的电压对所述模拟电源电压VAA进行升压，产生栅极导通电压VGH，所述电荷泵控制模块102控制所述三极管Tr1导通，所述栅极导通电压VGH从所述三极管Tr1的集电极输出；
步骤S3、所述第一电流侦测模块201采集第一电流，并在所述第一电流大于预设的第一比较电流时，向所述与门Y1的第一输入端提供低电平，在所述第一电流小于预设的第一比较电流时，向所述与门Y1的第一输入端提供高电平；所述第一电流为所述开关模块301第二端的电流；
步骤S4、所述第二电流侦测模块202采集第二电流，并在所述第二电流大于预设的第二比较电流时，向所述与门Y1的第二输入端提供高电平，在所述第二电流小于预设的第二比较电流时，向所述与门Y1的第二输入端 提供低电平；所述第二电流为所述三极管Tr1集电极的电流；
步骤S5、所述升压控制模块101接收所述与门Y1的输出端的电平，在所述与门Y1的输出端的电平为低电平，控制所述开关模块301维持当前的开关频率，在所述与门Y1的输出端的电平为高电平，控制所述开关模块301提升当前的开关频率。
此外，本发明还提供一种液晶显示装置，包括上述的直流电压变换电路。
综上所述，本发明提供一种直流电压变换电路，包括：升压电路、电荷泵电路、及控制电路，所述控制电路中增设有第一电流侦测模块、第二电流侦测模块、及与门，通过第一电流侦测模块侦测升压电路中的第一电流，并根据第一电流的大小向所述与门的第一输入端提供高电平或低电平，通过第二电流侦测模块侦测电荷泵电路中的第二电流，并根据第二电流的大小向所述与门的第二输入端提供高电平或低电平，利用所述与门的输出端的电平控制开关模块在所述第一电流较小且第二电流较大即升压电路为轻载且电荷泵电路为重载时提升开关频率，从而提升升压电路提供给电荷泵电路的驱动电压的驱动能力，保证电荷泵电路的正常工作，提升VGH电压的稳定性。本发明还提供一种直流电压变换方法，能够根据升压电路和电荷泵电路的负载轻重自动调整开关模块的开关频率，保证电荷泵电路的正常工作。本发明还提供一种液晶显示装置，能够根据升压电路和电荷泵电路的负载轻重自动调整开关模块的开关频率，保证电荷泵电路的正常工作。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (8)

  1. 一种直流电压变换电路，包括：升压电路、电荷泵电路、及控制电路；
    所述升压电路包括：电感、第一二极管、及第一电容；所述电荷泵电路包括：第二电容、第三电容、第二二极管、第三二极管、及三极管；所述控制电路包括：开关模块、与门、第一电流侦测模块、第二电流侦测模块、升压控制模块、及电荷泵控制模块；
    所述电感的第一端接入输入电压，第二端电性连接第一节点；所述第一二极管的正极电性连接第一节点，负极输出模拟电源电压；所述第一电容的第一端电性连接第一二极管的负极，第二端接地；所述第二电容的第一端电性连接第一节点，第二端电性连接第二二极管的负极；所述第二二极管的正极电性连接第一二极管的负极；所述第三二极管的正极电性连接第二二极管的负极，负极电性连接第三电容的第一端；所述第三电容的第二端接地；所述三极管的基极电性连接电荷泵控制模块，发射极电性连接第三二极管的负极，集电极输出栅极导通电压；
    所述开关模块的控制端电性连接升压控制模块的第一端，第一端电性连接第一节点，第二端接地；所述升压控制模块的第二端电性连接与门的输出端；所述第一电流侦测模块用于采集第一电流，并在所述第一电流大于预设的第一比较电流时，向所述与门的第一输入端提供低电平，在所述第一电流小于预设的第一比较电流时，向所述与门的第一输入端提供高电平；所述第一电流为所述开关模块第二端的电流；
    所述第二电流侦测模块用于采集第二电流，并在所述第二电流大于预设的第二比较电流时，向所述与门的第二输入端提供高电平，在所述第二电流小于预设的第二比较电流时，向所述与门的第二输入端提供低电平；所述第二电流为所述三极管集电极的电流；
    所述升压控制模块用于控制所述开关模块的开启和关闭，并根据所述与门的输出端的电平控制所述开关模块的开关频率，当所述与门的输出端的电平为低电平，所述升压控制模块控制所述开关模块维持当前的开关频率，当所述与门的输出端的电平为高电平，所述升压控制模块控制所述开关模块提升当前的开关频率；
    所述电荷泵控制模块用于控制所述三极管的通断。
  2. 如权利要求1所述的直流电压变换电路，其中，所述第一电流侦测 模块包括：第一电流比较器、及反相器；
    所述第一电流比较器的正相输入端电性连接开关模块的第二端，反相输入端接入第一比较电流，输出端电性连接反相器的输入端；所述反相器的输出端电性连接与门的第一输入端。
  3. 如权利要求1所述的直流电压变换电路，其中，所述第二电流侦测模块包括：第二电流比较器；
    所述第二电流比较器的正相输入端电性连接三极管的集电极，反相输入端接入第二参考电流，输出端电性连接与门的第二输入端。
  4. 如权利要求1所述的直流电压变换电路，其中，所述控制电路集成于一电源管理芯片中。
  5. 如权利要求1所述的直流电压变换电路，其中，所述第一二极管、第二二极管、及第三二极管均为肖特基极二极管。
  6. 如权利要求1所述的直流电压变换电路，其中，所述开关模块包括：MOS管、及电阻；
    所述MOS管的栅极电性连接升压控制模块，源极电性连接电阻的第一端，漏极电性连接第一节点；所述电阻的第二端接地；
    所述MOS管的栅极为所述开关模块的控制端，漏极为所述开关模块的第一端，所述电阻的第二端为所述开关模块的第二端。
  7. 一种直流电压变换方法，应用于如权利要求1所述的直流电压变换电路，包括如下步骤：
    步骤S1、所述升压控制模块反复开关所述开关模块，所述升压电路对输入电压进行升压得到模拟电源电压；
    步骤S2、所述电荷泵电路利用所述第一节点的电压对所述模拟电源电压进行升压，产生栅极导通电压，所述电荷泵控制模块控制所述三极管导通，所述栅极导通电压从所述三极管的集电极输出；
    步骤S3、所述第一电流侦测模块采集第一电流，并在所述第一电流大于预设的第一比较电流时，向所述与门的第一输入端提供低电平，在所述第一电流小于预设的第一比较电流时，向所述与门的第一输入端提供高电平；所述第一电流为所述开关模块第二端的电流；
    步骤S4、所述第二电流侦测模块采集第二电流，并在所述第二电流大于预设的第二比较电流时，向所述与门的第二输入端提供高电平，在所述第二电流小于预设的第二比较电流时，向所述与门的第二输入端提供低电平；所述第二电流为所述三极管集电极的电流；
    步骤S5、所述升压控制模块接收所述与门的输出端的电平，在所述与 门的输出端的电平为低电平，控制所述开关模块维持当前的开关频率，在所述与门的输出端的电平为高电平，控制所述开关模块提升当前的开关频率。
  8. 一种液晶显示装置，包括如权利要求1所述的直流电压变换电路。
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CN107316618A (zh) 2017-11-03
US10819230B2 (en) 2020-10-27
EP3657491A1 (en) 2020-05-27
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JP2020527928A (ja) 2020-09-10
US20200177077A1 (en) 2020-06-04

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