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CN111462708B - Voltage conversion circuit, voltage conversion method and display device - Google Patents

Voltage conversion circuit, voltage conversion method and display device Download PDF

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Publication number
CN111462708B
CN111462708B CN202010357269.0A CN202010357269A CN111462708B CN 111462708 B CN111462708 B CN 111462708B CN 202010357269 A CN202010357269 A CN 202010357269A CN 111462708 B CN111462708 B CN 111462708B
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terminal
voltage
module
diode
switch module
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CN111462708A (en
Inventor
刘方云
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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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Priority to CN202010357269.0A priority Critical patent/CN111462708B/en
Priority to PCT/CN2020/090418 priority patent/WO2021217733A1/en
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    • 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
    • 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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a voltage conversion circuit, a voltage conversion method and a display device. The voltage conversion circuit includes: the charge pump circuit comprises a booster circuit, a charge pump circuit and a control circuit; the control circuit comprises a first switch module, a second switch module, an electrical property detection module and a pulse module, wherein the first end of the electrical property detection module is connected with the first switch module, and the second end of the electrical property detection module is connected with the second end of the second switch module or the pulse module. The current of the control end of the triode (Q1) in the first switch module is detected by the newly-added electrical property detection module in the control circuit, so that the register or the pulse module is adjusted, the voltage drop of the first end and the second end of the triode in the first switch module is reduced, and the technical problems of overlarge loss and overlarge temperature in the first switch module are solved.

Description

Voltage conversion circuit, voltage conversion method and display device
Technical Field
The invention relates to the technical field of display, in particular to a voltage conversion circuit, a voltage conversion method and a display device.
Background
In the prior art, when a Thin film transistor liquid crystal display (TFT-LCD) is driven, various voltages including an analog power voltage VAA, a digital power voltage VDD, a gate-on voltage VGH, and a gate-off voltage VGL are input to the TFT-LCD. The current of VAA and VDD is large and is usually generated by a Boost (Boost) circuit or a Buck (Buck) circuit, while the current of VGH and VGL is small and is generally generated by a Charge Pump (Charge Pump) circuit with low cost.
The VGH current is not always in a heavy load state, and the VGH current may increase or decrease in different stages. Normally, a primary or secondary capacitor charge Pump is used and then is stepped down by a switching tube to generate VGH, and the main power consumption is on the switching tube. For large panels, the current is high, and especially under heavy load, the temperature of the switch tube exceeds the specified range, and the loss needs to be reduced.
In summary, the existing voltage conversion circuit has the technical problems of excessive loss and high temperature when the working current of a switching tube in the charge pump circuit is large.
Disclosure of Invention
The embodiment of the invention provides a voltage conversion circuit, a voltage conversion method and a display device, which are used for solving the technical problems of excessive loss and high temperature of a switching tube in a charge pump circuit when the working current of the switching tube in the conventional voltage conversion circuit is larger.
To solve the above problems, in a first aspect, the present invention provides a voltage conversionA circuit, comprising: the booster circuit comprises an inductor IL and a first capacitor CINA second capacitor COUTAnd a first diode D1, the charge pump circuit including a second diode D2, a third diode D3, and a third capacitor CCPThe control circuit comprises a first switch module, a second switch module, an electrical property detection module and a pulse module PM;
the first end of the inductor IL is connected with an input voltage VINAnd is connected to the first capacitor CINA second terminal of the inductor IL is connected to the first diode D1 and a first terminal of the second switch module, a second terminal of the second switch module outputs an analog supply voltage VAA and is connected to the second capacitor C respectivelyOUTAnd a first terminal of the second diode D2, the second switch module is used for adjusting the analog power voltage VAA, a second terminal of the second diode D2 is connected to a first terminal of the third diode D3, and second terminals of the third diode D3 are respectively connected to the third capacitor CCPAnd a first end of the first switch module, a second end of the first switch module outputting a gate-on voltage VGH, the first switch module being configured to step down and generate the gate-on voltage VGH, the first capacitor CINThe first diode D1 and the second capacitor COUTAnd said third capacitance CCPThe second terminal of (1) is grounded;
the pulse module PM is connected to a second end of the second diode D2, the pulse module is configured to provide a pulse voltage, a first end of the electrical property detection module is connected to the first switch module, and a second end of the electrical property detection module is connected to the second end of the second switch module or the pulse module PM;
the electrical property detection module detects the first switch module and releases an adjustment signal according to a detection result so as to adjust the second switch module or the pulse module, so that the analog power supply voltage VAA or the pulse voltage is reduced, and the voltage drop in the first switch module is reduced accordingly, so that the gate-on voltage VGH is kept unchanged.
In some embodiments of the invention, the first switch module comprises: a third resistor R3, a fourth resistor R4, a first comparator U1, and a transistor Q1, a second end of the transistor Q1 is connected to a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is grounded, a control end of the transistor Q1 is connected to an output end of the first comparator U1, a non-inverting input end of the first comparator U1 is connected to a first reference voltage CP _ Ref, and an inverting input end of the first comparator U1 is connected to a second end of the fourth resistor R4.
In some embodiments of the present invention, the electrical property detection module includes an electrical property detector P1 and a voltage regulator VM.
In some embodiments of the invention, a first terminal of the electrical property detector P1 is connected to the control terminal of the transistor Q1, a second terminal of the electrical property detector P1 is connected to a first terminal of the voltage regulator VM, and a second terminal of the voltage regulator VM is connected to the pulse module PM.
In some embodiments of the invention, the second switch module comprises: the driver comprises a first resistor R1, a second resistor R2, a second comparator U2, a driver DV and a MOS transistor Q2, wherein a second end of the MOS transistor Q2 is directly or indirectly connected with a first end of the first resistor R1, a second end of the first resistor R1 is connected with a first end of the second resistor R2, a second end of the second resistor R2 is grounded, an inverting input end of the second comparator U2 is connected with a second end of the first resistor R1, a non-inverting input end of the second comparator U2 is connected with a second reference voltage Boost _ Ref, an output end of the second comparator U2 is connected with a first end of the driver DV, and a second end of the driver DV is connected with a control end of the MOS transistor Q2.
In some embodiments of the present invention, the electrical property detection module includes an electrical property detector P1, a voltage regulator VM and a register Rg; the first switching module includes a transistor Q1.
In some embodiments of the invention, a first terminal of the electrical property detector P1 is connected to the control terminal of the transistor Q1, a second terminal of the electrical property detector P1 is connected to the first terminal of the voltage regulator VM, a second terminal of the voltage regulator VM is connected to the first terminal of the register Rg, a second terminal of the register Rg is connected to the second terminal of the MOS transistor Q2, and a third terminal of the register Rg is connected to the first terminal of the first resistor R1.
In some embodiments of the present invention, the second terminal of the first diode D1, the first terminal of the second diode D2, and the first terminal of the third diode D3 are conducting terminals, and the first terminal of the first diode D1, the second terminal of the second diode D2, and the second terminal of the third diode D3 are cut-off terminals.
In a second aspect, the present invention provides a voltage converting method applied to the voltage converting circuit, including the following steps:
s1, inputting the input voltage V to the booster circuitINOutputting the analog power supply voltage VAA after boosting;
s2, enabling the analog power supply voltage VAA to pass through the charge pump circuit and then through the first switch module to reduce the voltage to generate the grid-connected voltage VGH;
and S3, the electrical property detection module detects the current of the control end of the triode Q1 in the first switch module, compares the current with a preset current, and adjusts the register Rg or the pulse module PM when the detected current is larger than the preset current so as to reduce the voltage drop at two ends of the first end and the second end of the triode Q1 in the first switch module.
In a third aspect, the present invention also provides a display device, including the voltage conversion circuit as described above.
Compared with the existing voltage conversion circuit, the invention detects the current of the control end of the triode (Q1) in the first switch module by adding the electrical detection module which is arranged between the first switch module and the second switch module or between the first switch module and the pulse module PM, adjusts the register Rg or the pulse module PM in the second switch module, reduces the duty ratio of the second switch module when adjusting the register Rg, thereby realizing the reduction of the analog power supply voltage VAA, the voltage drop of the first end and the second end of the triode Q1 in the first switch module, and the output grid conducting voltage is unchanged; when the pulse module PM is adjusted, the pulse frequency is kept unchanged, and the pulse voltage amplitude is reduced, so that the voltage drop between the first end and the second end of the triode Q1 in the first switch module is reduced, and the output gate-on voltage VGH is unchanged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a circuit diagram of a voltage conversion circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a voltage conversion circuit according to an embodiment of the present invention; and
FIG. 3 is a flow chart of a voltage conversion method according to an embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The existing voltage conversion circuit has the technical problems of overlarge loss and overhigh temperature when a switching tube in a charge pump circuit has larger working current.
Accordingly, the embodiment of the invention provides a voltage conversion circuit, a voltage conversion method and a display device.
The following are detailed below.
First, an embodiment of the present invention provides a voltage conversion circuit, where the voltage conversion circuit includes a voltage boost circuit, a charge pump circuit, and a control circuit; the booster circuit comprises an inductor IL and a first capacitor CINA second capacitor COUTAnd a first diode D1, the charge pump circuit including a second diode D2, a third diode D3, and a third capacitor CCPThe control circuit comprises a first switch module, a second switch module, an electrical property detection module and a pulse module PM; the first end of the inductor IL is connected with an input voltage VINAnd is connected to the first capacitor CINA second terminal of the inductor IL is connected to the first diode D1 and a first terminal of the second switch module, a second terminal of the second switch module outputs an analog supply voltage VAA and is connected to the second capacitor C respectivelyOUTA first terminal of the second diode D2, the second switch module to regulate the analog supply voltage VAA, a second terminal of the second diode D2Two ends of the second diode D3 are connected to the first end of the third diode D3, and the second ends of the third diode D3 are connected to the third capacitor CCPAnd a first end of the first switch module, a second end of the first switch module outputting a gate-on voltage VGH, the first switch module being configured to step down and generate the gate-on voltage VGH, the first capacitor CINThe first diode D1 and the second capacitor COUTAnd said third capacitance CCPThe second terminal of (1) is grounded;
the pulse module PM is connected to a second end of the second diode D2, the pulse module is configured to provide a pulse voltage, a first end of the electrical property detection module is connected to the first switch module, and a second end of the electrical property detection module is connected to the second end of the second switch module or the pulse module PM; the electrical property detection module detects the first switch module and releases an adjustment signal according to a detection result so as to adjust the second switch module or the pulse module, so that the analog power supply voltage VAA or the pulse voltage is reduced, and the voltage drop in the first switch module is reduced accordingly, so that the gate-on voltage VGH is kept unchanged.
Compared with the existing voltage conversion circuit, the invention has the advantages that the electrical property detection module is additionally arranged between the first switch module and the second switch module or between the first switch module and the pulse module PM, the current of the control end of the triode Q1 in the first switch module is detected and converted into the corresponding voltage value, the register Rg or the pulse module PM in the second switch module is adjusted, the voltage drop of the first end and the second end of the triode in the first switch module is reduced, the output grid conducting voltage VGH is unchanged, and the technical problems of overlarge loss and overlarge temperature in the first switch module are solved.
The first capacitor CINFor stabilizing the input voltage, the first diode D1 for avoiding generating abrupt voltage, the second capacitor COUTFor stabilizing the output voltage, the third capacitor CCPFor stabilizing the output voltage, the second diodeThe tube D2 and the third diode D3 are used for unidirectional conduction.
On the basis of the above embodiment, the first switch module includes: the circuit comprises a third resistor R3, a fourth resistor R4, a first comparator U1 and a triode Q1. A first end of the triode Q1 is connected to the second end of the third diode D3, a second end of the triode Q1 outputs a gate-on voltage VGH and is connected to the first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to the first end of the third resistor R3, a second end of the third resistor R3 is grounded, a control end of the triode Q1 is connected to the output end of the first comparator U1, a non-inverting input end of the first comparator U1 is connected to a first reference voltage CP _ Ref, and an inverting input end of the first comparator U1 is connected to the second end of the fourth resistor R4.
In an embodiment of the present invention, the second switch module includes: the circuit comprises a first resistor R1, a second resistor R2, a second comparator U2, a driver and a MOS tube Q2. A first end of the MOS transistor Q2 is connected to a second end of the inductor IL, a second end of the MOS transistor Q2 outputs an analog power supply voltage VAA and is directly or indirectly connected to a first end of the first resistor R1, a second end of the first resistor R1 is connected to a first end of the second resistor R2, a second end of the second resistor R2 is grounded, an inverting input end of the second comparator U2 is connected to a second end of the first resistor R1, a non-inverting input end of the second comparator U2 is connected to a second reference voltage Boost-Ref, an output end of the second comparator U2 is connected to a first end of the driver, and a second end of the driver is connected to a control end of the MOS transistor Q2.
On the basis of the above embodiments, in another embodiment of the present invention, as shown in fig. 1, a circuit diagram of a voltage converting circuit in one embodiment of the present invention is shown. The electrical property detection module comprises an electrical property detector P1 and a voltage regulator VM, a first end of the electrical property detector P1 is connected with a control end of the triode Q1, a second end of the electrical property detector P1 is connected with a first end of the voltage regulator VM, and the voltage regulator VM is connected with the pulse module PM. Specifically, the electrical property detector P1 is used to reflect the current magnitude of the control terminal of the transistor Q1 and generate a signal to the voltage regulator VM, which provides an appropriate voltage signal to the pulse module PM.
In this embodiment, the electrical property detector P1 detects a current flowing from a first terminal of the first switch module, which is the control terminal of the transistor Q1, and the current is actually a first current Ib, and a current flowing from the second terminal of the third diode D3 to the first terminal of the transistor Q1 is a second current Ic. When a large current appears in the boost circuit, the corresponding second current Ic is increased, when the switch of the triode Q1 is in a working state and is located in a linear region, the first current Ib located at the control end of the triode Q1 is positively correlated with the second current Ic located at the first end of the triode Q1, the first current Ib is also increased correspondingly, after the electrical property detector P1 detects the current magnitude of the first current Ib, a signal is generated to the voltage regulator VM, and then the voltage regulator VM provides a proper voltage signal to trigger the pulse voltage amplitude Vpulse change of the pulse module PM, so that the pulse voltage amplitude Vpulse reduces the pulse frequency unchanged. According to the formula VGH ═ VAA + Vpulse-VQ1, if the pulse voltage amplitude Vpulse is reduced and the closed-loop gate turn-on voltage VGH output is to be kept constant, the voltage drop VQ1 between the first end and the second end of the transistor is inevitably reduced, so that the loss of the transistor Q1 is reduced, and accordingly the temperature is also reduced.
On the basis of the above embodiments, in another embodiment of the present invention, as shown in fig. 2, a circuit diagram of a voltage converting circuit in one embodiment of the present invention is shown. The electrical property detection module comprises an electrical property detector P1, a voltage regulator VM and a register Rg, the first end of the electrical property detector P1 is connected with the control end of the triode Q1, the second end of the electrical property detector P1 is connected with the second end of the electrical property detector P1 is connected with the first end of the voltage regulator VM, the voltage regulator VM is connected with the first end of the register Rg, the second end of the register Rg is connected with the first end of the MOS tube Q2, and the third end of the register Rg is connected with the first end of the first resistor R1. Specifically, the electrical detector P1 is used to reflect the current magnitude of the control terminal of the transistor Q1 and generate a signal to the voltage regulator VM, which provides an appropriate voltage signal to the register Rg in the second switch module.
In this embodiment, the electrical property detector P1 detects a current flowing from a first terminal of the first switch module, which is the control terminal of the transistor Q1, and the current is actually a first current Ib, and a current flowing from the second terminal of the third diode D3 to the first terminal of the transistor Q1 is a second current Ic. When a large current appears in the boost circuit, the second current Ic is correspondingly increased, and when the switch of the transistor Q1 is in the working state and is located in the linear region, the first current Ib located at the control end of the transistor Q1 is positively correlated with the second current Ic located at the first end of the transistor Q1, and the first current Ib is also correspondingly increased, after the electrical property detector P1 detects the current magnitude of the first current Ib, a signal is generated to the voltage regulator VM, and then the voltage regulator VM provides a proper voltage signal to trigger a Power Management integrated circuit (Power Management Ic), and the PMIC detects and regulates the register Rg potential, so as to correspondingly reduce the duty ratio of the MOS transistor Q2, thereby reducing the analog Power supply voltage VAA. According to the VGH + Vpulse-VQ1, since the analog power supply voltage VAA is reduced and the closed-loop gate-on voltage VGH output is kept unchanged, the voltage drop VQ1 between the first end and the second end of the transistor is inevitably reduced, so that the loss of the transistor Q1 is reduced and the temperature thereof is correspondingly reduced.
In addition to the above embodiments, preferably, the second terminal of the first diode D1, the first terminal of the second diode D2, and the first terminal of the third diode D3 are conducting terminals, and the first terminal of the first diode D1, the second terminal of the second diode D2, and the second terminal of the third diode D3 are cut-off terminals.
Preferably, the first terminal of the transistor Q1 is an emitter, the second terminal of the transistor Q1 is a collector, and the control terminal of the transistor Q1 is a base; the first end of the MOS transistor Q2 is a source electrode, the second end of the MOS transistor Q2 is a drain electrode, and the third end of the MOS transistor Q2 is a grid electrode.
Preferably, the pulse module PM is connected to the fourth capacitor C, the transistor Q1 is an NPN-type transistor, and the MOS transistor Q2 is a P-channel silicon MOS field effect transistor.
In order to better implement the voltage converting circuit in the embodiment of the present invention, on the basis of the voltage converting circuit, an embodiment of the present invention further provides a voltage converting method, as shown in fig. 3, which is a flowchart of the voltage converting method in an embodiment of the present invention, where the voltage converting method includes the following steps:
s1, inputting an input voltage VIN to the booster circuit, and outputting the analog power supply voltage VAA after boosting;
s2, the analog power supply voltage passes through the charge pump circuit and then is reduced by the first switch module to generate the grid-connected voltage VGH;
and S3, the electrical property detection module detects the current of the control end of the triode Q1 in the first switch module, compares the current with a preset current, and adjusts the register Rg or the pulse module PM when the detected current is larger than the preset current so as to reduce the voltage drop at two ends of the first end and the second end of the triode Q1 in the first switch module.
In an embodiment of the present invention, there is also provided a display device including the voltage conversion circuit described in the above embodiment. By employing the voltage conversion circuit as described in the above embodiments, the performance of the display device is further improved.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again. In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing method embodiment, which is not described herein again. The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.
The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A voltage conversion circuit, comprising: the charge pump circuit comprises a booster circuit, a charge pump circuit and a control circuit;
the booster circuit comprises an Inductor (IL) and a first capacitor (C)IN) A second capacitor (C)OUT) And a first diode (D1), the charge pump circuit including a second diode (D2), a third diode (D3), and a third capacitor (C)CP) The control circuit comprises a first switch module, a second switch module, an electrical property detection module and a Pulse Module (PM);
the first end of the Inductor (IL) is connected to an input voltage (V)IN) And is connected to said first capacitance (C)IN) A second terminal of the Inductor (IL) is connected to the first diode (D1) and to a first terminal of the second switch module, a second terminal of the second switch module outputs an analog supply Voltage (VAA) and is connected to the second capacitor (C), respectivelyOUT) And a first terminal of the second diode (D2), the second switch module being configured to regulate the analog supply Voltage (VAA), a second terminal of the second diode (D2) being coupled to a first terminal of the third diode (D3), second terminals of the third diode (D3) being coupled to the third capacitor (C3), respectivelyCP) And a first terminal of the first switch module, a second terminal of the first switch module outputting a gate-on Voltage (VGH), the first switch module being configured to step down to generate the gate-on Voltage (VGH), the first capacitor (C)IN) The first diode (D1), the second capacitor (C)OUT) And said third capacitance (C)CP) The second terminal of (1) is grounded;
the Pulse Module (PM) is connected with the second end of the second diode (D2), the pulse module is used for providing pulse voltage, the first end of the electrical property detection module is connected with the first switch module, and the second end of the electrical property detection module is connected with the second end of the second switch module or the Pulse Module (PM);
the electrical property detection module detects the first switch module and releases an adjustment signal according to a detection result so that the second switch module adjusts to reduce the analog power supply Voltage (VAA) or the pulse module adjusts to reduce the pulse voltage, and the voltage drop in the first switch module is reduced accordingly to keep the gate-on Voltage (VGH) unchanged.
2. The voltage conversion circuit of claim 1, wherein the first switching module comprises: the second end of the triode (Q1) is connected with the first end of the fourth resistor (R4), the second end of the fourth resistor (R4) is connected with the first end of the third resistor (R3), the second end of the third resistor (R3) is grounded, the control end of the triode (Q1) is connected with the output end of the first comparator (U1), the non-inverting input end of the first comparator (U1) is connected with a first reference voltage (CP _ Ref), and the inverting input end of the first comparator (U1) is connected with the second end of the fourth resistor (R4).
3. The voltage conversion circuit of claim 2, wherein the electrical property detection module comprises an electrical property detector (P1) and a voltage regulator (VM).
4. The voltage conversion circuit according to claim 3, wherein a first terminal of the electrical property detector (P1) is connected to the control terminal of the transistor (Q1), a second terminal of the electrical property detector (P1) is connected to a first terminal of the voltage regulator (VM), and a second terminal of the voltage regulator (VM) is connected to the Pulse Module (PM).
5. The voltage conversion circuit of claim 1, wherein the second switching module comprises: the driver circuit comprises a first resistor (R1), a second resistor (R2), a second comparator (U2), a Driver (DV) and a MOS transistor (Q2), wherein a second end of the MOS transistor (Q2) is directly or indirectly connected with a first end of the first resistor (R1), a second end of the first resistor (R1) is connected with a first end of the second resistor (R2), a second end of the second resistor (R2) is grounded, an inverting input end of the second comparator (U2) is connected with a second end of the first resistor (R1), a non-inverting input end of the second comparator (U2) is connected with a second reference voltage (Boost _ Ref), an output end of the second comparator (U2) is connected with a first end of the Driver (DV), and a second end of the Driver (DV) is connected with a control end of the MOS transistor (Q2).
6. The voltage conversion circuit of claim 5, wherein the electrical property detection module comprises an electrical property detector (P1), a voltage regulator (VM) and a register (Rg); the first switching module includes a transistor (Q1).
7. The voltage conversion circuit according to claim 6, wherein a first terminal of the electrical property detector (P1) is connected to the control terminal of the transistor (Q1), a second terminal of the electrical property detector (P1) is connected to a first terminal of the voltage regulator (VM), a second terminal of the voltage regulator (VM) is connected to a first terminal of the register (Rg), a second terminal of the register (Rg) is connected to a second terminal of the MOS transistor (Q2), and a third terminal of the register (Rg) is connected to a first terminal of the first resistor (R1).
8. The voltage conversion circuit of claim 1, wherein the second terminal of the first diode (D1), the first terminal of the second diode (D2), and the first terminal of the third diode (D3) are conducting terminals, and the first terminal of the first diode (D1), the second terminal of the second diode (D2), and the second terminal of the third diode (D3) are cut-off terminals.
9. A voltage conversion method applied to the voltage conversion circuit according to any one of claims 1 to 8, comprising the steps of:
s1, inputting input voltage (V) to the booster circuitIN) Outputting the analog supply Voltage (VAA) after boosting;
s2, the analog power supply Voltage (VAA) passes through the charge pump circuit and then is reduced by the first switch module to generate the grid-connected Voltage (VGH);
s3, the electric property detection module detects a first current of a control end of a triode (Q1) in the first switch module, compares the first current with a preset current, and when the first current is larger than the preset current, the electric property detection module adjusts a register (Rg) or the Pulse Module (PM) so as to reduce voltage drop at two ends of a first end and a second end of the triode (Q1) in the first switch module.
10. A display device comprising the voltage conversion circuit according to any one of claims 1 to 8.
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