WO2016149973A1 - 一种升降压变换电路、电源管理模块及液晶驱动装置 - Google Patents

一种升降压变换电路、电源管理模块及液晶驱动装置 Download PDF

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Publication number
WO2016149973A1
WO2016149973A1 PCT/CN2015/077056 CN2015077056W WO2016149973A1 WO 2016149973 A1 WO2016149973 A1 WO 2016149973A1 CN 2015077056 W CN2015077056 W CN 2015077056W WO 2016149973 A1 WO2016149973 A1 WO 2016149973A1
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Prior art keywords
switch
voltage
circuit
power supply
buck
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PCT/CN2015/077056
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English (en)
French (fr)
Inventor
张先明
曹丹
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/646,853 priority Critical patent/US9853549B2/en
Publication of WO2016149973A1 publication Critical patent/WO2016149973A1/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
    • 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
    • H02M3/1582—Buck-boost converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—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
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0408—Integration of the drivers onto the display substrate
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0833—Several active elements per pixel in active matrix panels forming a linear amplifier or follower
    • 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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs

Definitions

  • the present invention relates to the field of circuit technologies, and in particular, to a buck-boost conversion circuit, a power management module, and a liquid crystal driving device.
  • a flat panel display widely used in the market is a liquid crystal display (LCD).
  • LCD liquid crystal display
  • the liquid crystal display requires various operating voltages during the working process. These operating voltages are usually converted by the power management module of the driving circuit. get.
  • the power management integrated circuit PMIC integrates a boost boost circuit, a buck Buck circuit, an operational amplifier output op circuit, and a charge pump Charge Pump circuit, respectively.
  • Vin performs processing such as boosting, stepping down, and amplification to obtain various voltages required.
  • the two most commonly used voltages are the analog power supply voltage VAA and the digital power supply voltage DVDD, wherein the analog power supply voltage VAA is boosted by the Boost circuit to the input voltage Vin; the digital power supply voltage DVDD is controlled by the buck Buck circuit.
  • the input voltage Vin is stepped down.
  • the two voltages are generated by two sets of circuits independent of each other, and more components are required, which not only increases the production cost, but also occupies a larger panel area in the integrated circuit.
  • Embodiments of the present invention provide a buck-boost conversion circuit, a power management module, and a liquid crystal driving device.
  • the analog power supply voltage VAA and the digital power supply voltage DVDD can be generated by one set of lines, thereby reducing production cost and saving panel area.
  • a first aspect of the embodiments of the present invention provides a buck-boost conversion circuit, which may include:
  • a voltage conversion module for boosting an input voltage to obtain an analog power supply voltage VAA, or The input voltage is stepped down to obtain a digital power voltage DVDD;
  • a switch module configured to control the voltage conversion module to boost or step down the input voltage.
  • the switch module includes a first switch circuit and a second switch circuit, wherein:
  • the voltage conversion module boosts the input voltage to obtain the analog power supply voltage VAA;
  • the first switch circuit When the second switch circuit is turned on, the first switch circuit is turned off, and the voltage conversion module steps down the input voltage to obtain the digital power voltage DVDD.
  • the voltage conversion module includes an inductor L1
  • the first switch circuit includes a first switch transistor Q1, wherein:
  • the first end of the inductor L1 is connected to the second switch circuit, and the second end of the inductor L1 is connected to the second switch circuit and the first end of the first switch tube Q1;
  • the second end of the first switch tube Q1 is grounded, and the third end of the first switch tube Q1 is a control end;
  • the voltage conversion module includes an inductor L1
  • the second switch circuit includes a second switch transistor Q2 and a first diode D1, wherein:
  • the cathode of the first diode D1 is connected to the first end of the inductor L1 and the second end of the second switch tube Q2, the anode of the first diode D1 is grounded, and the inductor L1 is The two ends are connected to the first switch circuit;
  • the first end of the second switch tube Q2 is an input end of the buck-boost converter circuit, and the third end of the second switch tube Q2 is a control end, when the second switch tube Q2 is turned on, The second end of the inductor L1 generates the digital power supply voltage DVDD.
  • the first switching circuit further includes a second diode D2, and an anode of the second diode D2 is coupled to the second end of the inductor L1, the second diode The cathode of D2 leads to the output of the analog supply voltage VAA.
  • the second switch circuit further includes a third switch tube Q3, the first end of the third switch tube Q3 is connected to the second end of the inductor L1, and the third switch tube Q3 The second end of the digital power supply voltage DVDD is taken out, and the third end of the third switching tube Q3 is a control end.
  • the first switching transistor Q1 is a metal semiconductor oxide field effect transistor or a triode.
  • the second switching transistor Q2 and the third switching transistor Q3 are metal semiconductor oxide field effect transistors or transistors.
  • a second aspect of the embodiments of the present invention provides a power management module, where the power management module includes the buck-boost conversion circuit according to the first aspect, and the buck-boost conversion circuit is configured to output an analog power voltage VAA or a digital Power supply voltage DVDD.
  • a third aspect of the embodiments of the present invention provides a liquid crystal driving device, which may include the power management module according to the second aspect.
  • the buck-boost conversion circuit of the embodiment of the invention comprises a voltage conversion module and a switch module, and the voltage conversion module is controlled to generate an analog power supply voltage VAA or a digital power supply voltage DVDD through switching of the switch module, so that the boosting and the step-down share a set of lines.
  • the voltage conversion module is controlled to generate an analog power supply voltage VAA or a digital power supply voltage DVDD through switching of the switch module, so that the boosting and the step-down share a set of lines.
  • FIG. 1 is a schematic structural diagram of a power management module in the prior art
  • FIG. 2 is a schematic structural diagram of an embodiment of a buck-boost conversion circuit according to an embodiment of the present invention
  • FIG. 3 is a circuit diagram of an embodiment of a buck-boost conversion circuit according to an embodiment of the present invention.
  • FIG. 4 is a circuit diagram of another embodiment of a buck-boost conversion circuit according to an embodiment of the present invention.
  • FIG. 5 is a timing diagram of control signals of a switch tube in a buck-boost conversion circuit according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of an embodiment of a power management module according to an embodiment of the present invention.
  • the embodiment of the invention provides a buck-boost conversion circuit, a power management module and a liquid crystal driving device, which can generate an analog power supply voltage VAA and a digital power supply voltage DVDD through a set of circuits, thereby reducing production cost and saving panel area.
  • a buck-boost conversion circuit a power management module and a liquid crystal driving device, which can generate an analog power supply voltage VAA and a digital power supply voltage DVDD through a set of circuits, thereby reducing production cost and saving panel area.
  • FIG. 2 is a schematic structural diagram of an embodiment of a buck-boost conversion circuit according to an embodiment of the present invention.
  • the buck-boost conversion circuit may include a voltage conversion module M1 and a switch module M2, wherein:
  • the voltage conversion module M1 is configured to boost the input voltage to obtain the analog power supply voltage VAA, or to step down the input voltage to obtain a digital power supply voltage DVDD;
  • the switch module M2 is configured to control the voltage conversion module to boost or step down the input voltage.
  • the input voltage is a DC voltage, such as a DC voltage of 12V.
  • the voltage conversion module M1 can use the electromagnetic induction and energy storage characteristics of the inductor to boost or step down the input voltage Vin, and can also use the charge and discharge of the capacitor to boost or step down.
  • the voltage conversion module M1 may include an inductor or include an inductor and a capacitor. In specific implementations, some resistors, filter capacitors, and the like may be added to the actual circuit as needed.
  • the switch module M2 may include a first switch circuit and a second switch circuit, respectively controlling the voltage conversion module to operate in a boost mode or a buck mode. For example, when the first switch circuit is turned on, the second switch circuit can be turned off, and the voltage conversion module M1 can release the previously stored energy to achieve the boosting effect, generate the analog power supply voltage VAA, and simulate the power supply voltage VAA.
  • the output of the voltage conversion module M1 may lead to two branches for outputting the analog power voltage VAA and the digital power voltage DVDD, respectively.
  • a switch tube can be separately provided for blocking without The desired voltage signal.
  • a switch tube is disposed on a branch for outputting the analog power supply voltage VAA.
  • the buck-boost conversion circuit of the embodiment of the invention comprises a voltage conversion module and a switch module, and the voltage conversion module is controlled to generate an analog power supply voltage VAA or a digital power supply voltage DVDD through switching of the switch module, so that the boosting and the step-down share a set of lines.
  • the voltage conversion module is controlled to generate an analog power supply voltage VAA or a digital power supply voltage DVDD through switching of the switch module, so that the boosting and the step-down share a set of lines.
  • the voltage conversion module M1 may include an inductor L1
  • the switch module M2 includes a first switch circuit and a second switch circuit
  • the first switch circuit may include a first switch tube Q1
  • the second switch tube circuit may include a second The switch tube Q2 and the first diode D1, wherein the third end of the first switch tube Q1 and the third end of the second switch tube Q2 are control terminals, and an external control signal is input from the control end to respectively control the first switch tube Q1 and the second switching transistor Q2 are turned on or off.
  • the first end of the second switching transistor Q2 is an input end of the buck-boost conversion circuit, and the input voltage Vin is input to the buck-boost conversion circuit through the second switching transistor Q2.
  • the first end of the inductor L1 is connected to the second end of the second switch tube Q2 and the cathode of the first diode D1, and the second end of the inductor L1 is connected to the first end of the first switch tube Q1; The two ends are grounded; the anode of the first diode D1 is grounded.
  • the second switching transistor Q2 when the first switching transistor Q1 is turned on, the second switching transistor Q2 is turned off by the control of the external control signal. At this time, the first end of the L1 suddenly stops the input of the input voltage Vin, due to the electromagnetic induction characteristic of the inductor L1.
  • the two ends of the inductor L1 generate the same induced voltage as the input voltage Vin, so that the second terminal voltage of the inductor L1 is the analog power supply voltage VAA required by the liquid crystal driving device.
  • the second switch Q2 When the second switch Q2 is turned on, the first switch Q1 is turned off. At this time, the first end of the inductor L1 suddenly has a voltage input. Due to the electromagnetic induction characteristic of the inductor L1, both ends of the inductor L1 are opposite to the input voltage Vin.
  • the induced voltage, the first diode D1 conducts freewheeling, so that the voltage of the second terminal of the inductor L1 becomes the digital power supply voltage DVDD required by the liquid crystal driving device.
  • the inductance L1 is electromagnetically induced by controlling the on/off of the first switching transistor Q1, the second switching transistor Q2, and the first diode D1, thereby generating an analog power supply voltage VAA required for the liquid crystal driving device.
  • digital power supply voltage DVDD the circuit structure is simple, fewer components, can reduce production costs and save the panel area occupied by the buck-boost circuit.
  • the first switch circuit may further include a second diode D2, and the anode of the second diode D2 is connected to the inductor L1.
  • the cathode of the second diode D2 leads to the output of the analog power supply voltage VAA.
  • the second switch circuit When the second switch circuit is turned on, the second end of the inductor L1 generates the digital power supply voltage DVDD, since the digital power supply voltage DVDD is a negative voltage, and the second diode D2 has a unidirectional conduction characteristic, the second diode can be protected
  • the voltage output from the cathode of D2 ie, the output of the analog supply voltage VAA
  • the digital supply voltage DVDD is protected from the digital supply voltage DVDD.
  • the second switch circuit may further include a third switch tube Q3, the first end of the third switch tube Q3 is connected to the second end of the inductor L1, and the third switch tube Q3 is The second end leads to the output end of the digital power voltage DVDD, and the third end of the third switch tube Q3 is a control end.
  • the third switch tube Q3 when the first switch tube Q1 is turned on, the third switch tube Q3 is turned off. At this time, the analog power supply voltage VAA generated at the second end of the inductor L1 cannot pass through the third switch tube Q3, and the digital power supply voltage DVDD output can be protected. The voltage output from the terminal (ie, the second terminal of the third switching transistor Q3) is protected from the analog power supply voltage VAA.
  • the first switch transistor Q1, the second switch transistor Q2, and the third switch transistor Q3 may select a field effect transistor or a triode.
  • the metal semiconductor oxide field effect transistor MOSFET is taken as an example, and the timings of the gate control signals of the first switching transistor Q1, the second switching transistor Q2, and the third switching transistor Q3 can be as shown in FIG. 5.
  • a filter capacitor can be connected in series at the VAA output end and the DVDD output end, which can be used for energy storage, and can also be used for filtering to solve the electromagnetic interference problem.
  • the inductance L1 is electromagnetically induced by controlling the on/off of the first switching transistor Q1, the second switching transistor Q2, and the first diode D1, thereby generating an analog power supply voltage VAA and a number required for the liquid crystal driving device.
  • the power supply voltage DVDD through the blocking of the second diode D2 and the third switching transistor Q3, prevents the voltage outputted from the VAA output terminal and the DVDD output terminal from being disturbed.
  • the circuit structure of the embodiment of the invention is simple, the components are few, and the production can be reduced. Cost and save the panel area occupied by the buck-boost circuit.
  • the embodiment of the present invention may further provide a power management module, which may include a buck-boost conversion circuit as described in the embodiment shown in FIG. 2, or may include the liter described in the embodiment shown in any one of FIG. a buck conversion circuit, wherein the buck-boost conversion circuit is configured to generate an analog power supply voltage VAA or a digital power supply Press DVDD.
  • a power management module which may include a buck-boost conversion circuit as described in the embodiment shown in FIG. 2, or may include the liter described in the embodiment shown in any one of FIG. a buck conversion circuit, wherein the buck-boost conversion circuit is configured to generate an analog power supply voltage VAA or a digital power supply Press DVDD.
  • the power management module may include an operational amplifier output circuit 602 and at least one charge pump circuit 603 in addition to the buck-boost conversion circuit 601.
  • the buck-boost conversion circuit 601 can be used to generate an analog power supply voltage VAA or a digital power supply voltage DVDD required for the liquid crystal driving device;
  • the operational amplifier output circuit 602 can be used to generate a liquid crystal driving upper limit voltage HVAA required for the liquid crystal driving device;
  • the pump circuit 603 can be used to generate a gate-on voltage VGH or a gate-off voltage VGL required for the liquid crystal driving device.
  • the power management module of the embodiment of the present invention has a simple circuit structure and few components, which can reduce the production cost and save the panel area occupied by the power management module.
  • the embodiment of the invention may further provide a liquid crystal driving device, which may include the above power management module.
  • a liquid crystal driving device which may include the above power management module.
  • the liquid crystal driving device of the embodiment of the present invention has a simple structure and few components, which can reduce the production cost and save the panel area.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Dc-Dc Converters (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
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Abstract

一种升降压变换电路、电源管理模块及液晶驱动装置。升降压变换电路包括电压变换模块（M1）和开关模块（M2）。电压变换模块用于将输入电压（Vin）升压得到模拟电源电压（VAA），或者将输入电压降压得到数字电源电压（DVDD）；开关模块用于控制电压变换模块对输入电压进行升压或降压。该变换电路共用一套线路来生成模拟电源电压和数字电源电压，电路结构简单，元器件少，可降低生产成本并节省面板面积。

Description

一种升降压变换电路、电源管理模块及液晶驱动装置
本发明要求2015年3月20日递交的发明名称为“一种升降压变换电路、电源管理模块及液晶驱动装置”的申请号为201510124485.X的在先申请的优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及电路技术领域，尤其涉及一种升降压变换电路、电源管理模块及液晶驱动装置。
背景技术
目前市场上应用较多的一种平板显示器是液晶显示器(Liquid Crystal Display，LCD)，液晶显示器在工作过程中需要多种工作电压，这些工作电压通常由驱动电路的电源管理模块对输入电压进行变换得到。
现有技术常用的一种电源管理模块如图1所示，电源管理集成电路PMIC中集成了升压Boost电路、降压Buck电路、运放输出op电路和电荷泵Charge Pump电路，分别对输入电压Vin进行升压、降压、放大等处理，以得到所需的各种电压。在液晶显示器的驱动电路中，最常用的两个电压是模拟电源电压VAA和数字电源电压DVDD，其中模拟电源电压VAA由Boost电路对输入电压Vin升压得到；数字电源电压DVDD由降压Buck电路对输入电压Vin降压得到。现有技术中这两种电压采用互相独立的两套电路来产生，需要采用较多的元器件，不仅增加了生产成本，还占用了集成电路中较大的面板面积。
发明内容
本发明实施例提供一种升降压变换电路、电源管理模块及液晶驱动装置，可用一套线路来生成模拟电源电压VAA和数字电源电压DVDD，降低生产成本并节省面板面积。
本发明实施例第一方面提供一种升降压变换电路，可包括：
电压变换模块，用于将输入电压升压得到模拟电源电压VAA，或者，将 所述输入电压降压得到数字电源电压DVDD；
开关模块，用于控制所述电压变换模块对所述输入电压进行升压或降压。
在一些可行的实施方式中，所述开关模块，包括第一开关电路和第二开关电路，其中：
当所述第一开关电路导通时，所述第二开关电路关断，所述电压变换模块将所述输入电压升压以得到所述模拟电源电压VAA；
当所述第二开关电路导通时，所述第一开关电路关断，所述电压变换模块将所述输入电压降压以得到所述数字电源电压DVDD。
在一些可行的实施方式中，所述电压变换模块包括电感L1，所述第一开关电路包括第一开关管Q1，其中：
所述电感L1的第一端连接所述第二开关电路，所述电感L1的第二端连接所述第二开关电路和所述第一开关管Q1的第一端；
所述第一开关管Q1的第二端接地，所述第一开关管Q1的第三端为控制端；
当所述第一开关管Q1导通时，所述电感L1的第二端生成所述模拟电源电压VAA。
在一些可行的实施方式中，所述电压变换模块包括电感L1，所述第二开关电路包括第二开关管Q2和第一二极管D1，其中：
所述第一二极管D1的阴极连接所述电感L1的第一端和所述第二开关管Q2的第二端，所述第一二极管D1的阳极接地，所述电感L1的第二端连接所述第一开关电路；
所述第二开关管Q2的第一端为所述升降压变换电路的输入端，所述第二开关管Q2的第三端为控制端，当所述第二开关管Q2导通时，所述电感L1的第二端生成所述数字电源电压DVDD。
在一些可行的实施方式中，所述第一开关电路还包括第二二极管D2，所述第二二极管D2的阳极连接所述电感L1的第二端，所述第二二极管D2的阴极引出所述模拟电源电压VAA的输出端。
在一些可行的实施方式中，所述第二开关电路还包括第三开关管Q3，所述第三开关管Q3的第一端连接所述电感L1的第二端，所述第三开关管Q3 的第二端引出所述数字电源电压DVDD的输出端，所述第三开关管Q3的第三端为控制端。
在一些可行的实施方式中，所述第一开关管Q1为金属半导体氧化物场效应晶体管或者三极管。
在一些可行的实施方式中，所述第二开关管Q2和所述第三开关管Q3为金属半导体氧化物场效应晶体管或者三极管。
本发明实施例第二方面提供了一种电源管理模块，所述电源管理模块包括如第一方面所述的升降压变换电路，所述升降压变换电路用于输出模拟电源电压VAA或数字电源电压DVDD。
本发明实施例第三方面提供了一种液晶驱动装置，所述液晶驱动装置可包括如第二方面所述的电源管理模块。
本发明实施例的升降压变换电路包括电压变换模块和开关模块，通过开关模块的切换来控制电压变换模块生成模拟电源电压VAA或数字电源电压DVDD，使得升压和降压共用一套线路，减少升降压变换电路的元器件，降低生产成本并节约面板占用面积。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术中电源管理模块的结构示意图；
图2是本发明实施例提供的升降压变换电路的一实施例的结构示意图；
图3是本发明实施例提供的升降压变换电路的一实施例的电路图；
图4是本发明实施例提供的升降压变换电路的另一实施例的电路图；
图5是本发明实施例提供的升降压变换电路中开关管的控制信号时序图；
图6是本发明实施例提供的电源管理模块的一实施例的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供一种升降压变换电路、电源管理模块及液晶驱动装置，可通过一套电路生成模拟电源电压VAA和数字电源电压DVDD，降低生产成本，节省面板面积，下面将结合附图对本发明的实施例进行详细说明。
参见图2，为本发明实施例提供的升降压变换电路的一实施例的结构示意图。如图2所示，升降压变换电路可包括电压变换模块M1和开关模块M2，其中：
电压变换模块M1，用于将输入电压升压得到模拟电源电压VAA，或者，将所述输入电压降压得到数字电源电压DVDD；
开关模块M2，用于控制所述电压变换模块对所述输入电压进行升压或降压。
在一些可行的实施方式中，输入电压为直流电压，例如12V的直流电压。
具体实施中，电压变换模块M1可利用电感的电磁感应和储能的特性实现对输入电压Vin的升压或降压，还可利用电容的充放电辅助升压或降压。可选地，电压变换模块M1可包括电感，或者包括电感和电容。具体实施中，根据需要，还可以在实际电路中增加一些电阻、滤波电容等元件。
具体实施中，开关模块M2可包括第一开关电路和第二开关电路，分别控制电压变换模块工作在升压模式或降压模式。例如，第一开关电路导通时，第二开关电路可以关断，电压变换模块M1可以将先前存储的能量释放出来，以达到升压的效果，生成模拟电源电压VAA，并将模拟电源电压VAA通过VAA输出端提供给液晶驱动装置的其他模块；当第二开关电路导通时，第一开关电路可以关断，电压变换模块M1开始储能，同时通过电磁感应生成数字电源电压DVDD，并将数字电源电压DVDD通过DVDD输出端输出给液晶驱动装置的其他模块。可选地，为区分开模拟电源电压VAA和数字电源电压DVDD，电压变换模块M1的输出端可引出两条支路，分别用于输出模拟电源电压VAA和数字电源电压DVDD，上述两条支路可分别设置一开关管，用于阻隔不需 要的电压信号。例如，在用于输出模拟电源电压VAA的支路上设置一开关管，当电压变换模块M1生成数字电源电压DVDD时，该开关管截止，可以避免数字电源电压DVDD从模拟电源电压VAA的支路输出。
本发明实施例的升降压变换电路包括电压变换模块和开关模块，通过开关模块的切换来控制电压变换模块生成模拟电源电压VAA或数字电源电压DVDD，使得升压和降压共用一套线路，减少升降压变换电路的元器件，降低生产成本并节约面板占用面积。
参见图3，为本发明实施例提供的升降压变换电路的一实施例的电路图。如图3所示，电压变换模块M1可包括电感L1，开关模块M2包括第一开关电路和第二开关电路，第一开关电路可包括第一开关管Q1，第二开关管电路可包括第二开关管Q2和第一二极管D1，其中第一开关管Q1的第三端和第二开关管Q2的第三端均为控制端，外部控制信号从控制端输入，分别控制第一开关管Q1和第二开关管Q2导通或截止。第二开关管Q2的第一端为所述升降压变换电路的输入端，输入电压Vin通过第二开关管Q2输入到升降压变换电路。电感L1的第一端连接第二开关管Q2的第二端和第一二极管D1的阴极，电感L1的第二端连接第一开关管Q1的第一端；第一开关管Q1的第二端接地；第一二极管D1的阳极接地。
具体实施中，通过外部控制信号的控制，当第一开关管Q1导通时，第二开关管Q2截止，此时L1的第一端突然停止输入电压Vin的输入，由于电感L1的电磁感应特性，电感L1的两端产生与输入电压Vin方向相同的感应电压，使得电感L1的第二端电压为液晶驱动装置所需的模拟电源电压VAA。当第二开关管Q2导通时，第一开关管Q1截止，此时电感L1的第一端突然有电压输入，由于电感L1的电磁感应特性，电感L1的两端产生与输入电压Vin方向相反的感应电压，第一二极管D1导通续流，使得电感L1的第二端电压变为液晶驱动装置所需的数字电源电压DVDD。
可见，本发明实施例中，通过控制第一开关管Q1、第二开关管Q2和第一二极管D1的通断使电感L1发生电磁感应，从而产生液晶驱动装置所需的模拟电源电压VAA和数字电源电压DVDD，电路结构简单，元器件少，可降低生产成本并节约升降压电路占用的面板面积。
参见图4，为本发明实施例提供的如图4所示，在一些可行的实施方式中，第一开关电路还可包括第二二极管D2，第二二极管D2的阳极连接电感L1的第二端，所述第二二极管D2的阴极引出所述模拟电源电压VAA的输出端。当第二开关电路导通，电感L1的第二端生成数字电源电压DVDD时，由于数字电源电压DVDD为负压，且第二二极管D2具有单向导通特性，可保护第二二极管D2的阴极(即模拟电源电压VAA的输出端)输出的电压免受数字电源电压DVDD的影响。
如图4所示，在一些可行的实施方式中，第二开关电路还可包括第三开关管Q3，第三开关管Q3的第一端连接电感L1的第二端，第三开关管Q3的第二端引出所述数字电源电压DVDD的输出端，所述第三开关管Q3的第三端为控制端。具体实施中，当第一开关管Q1导通时，第三开关管Q3截止，此时电感L1的第二端产生的模拟电源电压VAA无法通过第三开关管Q3，可保护数字电源电压DVDD输出端(即第三开关管Q3的第二端)输出的电压免受模拟电源电压VAA的影响。
可选地，第一开关管Q1、第二开关管Q2和第三开关管Q3可选用场效应晶体管或三极管。在本实施例中以金属半导体氧化物场效应晶体管MOSFET为例，则第一开关管Q1、第二开关管Q2和第三开关管Q3的栅极控制信号的时序可如图5所示。
具体实施中，在VAA输出端和DVDD输出端还可各串联一个滤波电容，可用于储能，还可用于滤波，解决电磁干扰问题。
本发明实施例中，通过控制第一开关管Q1、第二开关管Q2和第一二极管D1的通断使电感L1发生电磁感应，从而产生液晶驱动装置所需的模拟电源电压VAA和数字电源电压DVDD，通过第二二极管D2和第三开关管Q3的阻隔，避免VAA输出端和DVDD输出端输出的电压受到干扰，本发明实施例的电路结构简单，元器件少，可降低生产成本并节约升降压电路占用的面板面积。
本发明实施例还可提供一种电源管理模块，可包括如图2所示实施例所描述的升降压变换电路，或可包括如图3-5任一项所示实施例所描述的升降压变换电路，其中上述升降压变换电路用于生成模拟电源电压VAA或数字电源电 压DVDD。
在一些可行的实施方式中，如图6所示，该电源管理模块除了包括升降压变换电路601外，还可包括运放输出电路602和至少一个电荷泵电路603。其中升降压变换电路601可用于产生液晶驱动装置所需的模拟电源电压VAA或数字电源电压DVDD；运放输出电路602可用于产生液晶驱动装置所需的液晶驱动上限电压HVAA；上述至少一个电荷泵电路603可用于产生液晶驱动装置所需的栅极导通电压VGH或栅极关断电压VGL。
根据图3-5的描述可知，本发明实施例的电源管理模块电路结构简单，元器件少，可降低生产成本并节约电源管理模块占用的面板面积。
本发明实施例还可提供一种液晶驱动装置，可包括上述的电源管理模块。根据以上对电源管理模块的描述可知，本发明实施例的液晶驱动装置结构简单，元器件少，可降低生产成本并节省面板面积。
以上所述的实施方式，并不构成对该技术方案保护范围的限定。任何在上述实施方式的精神和原则之内所作的修改、等同替换和改进等，均应包含在该技术方案的保护范围之内。

Claims (15)

  1. 一种升降压变换电路，其特征在于，包括：
    电压变换模块，用于将输入电压升压得到模拟电源电压VAA，或者，将所述输入电压降压得到数字电源电压DVDD；
    开关模块，用于控制所述电压变换模块对所述输入电压进行升压或降压。
  2. 根据权利要求1所述的升降压变换电路，其特征在于，所述开关模块，包括第一开关电路和第二开关电路，其中：
    当所述第一开关电路导通时，所述第二开关电路关断，所述电压变换模块将所述输入电压升压以得到所述模拟电源电压VAA；
    当所述第二开关电路导通时，所述第一开关电路关断，所述电压变换模块将所述输入电压降压以得到所述数字电源电压DVDD。
  3. 根据权利要求2所述的升降压变换电路，其特征在于，所述电压变换模块包括电感L1，所述第一开关电路包括第一开关管Q1，其中：
    所述电感L1的第一端连接所述第二开关电路，所述电感L1的第二端连接所述第二开关电路和所述第一开关管Q1的第一端；
    所述第一开关管Q1的第二端接地，所述第一开关管Q1的第三端为控制端；
    当所述第一开关管Q1导通时，所述电感L1的第二端生成所述模拟电源电压VAA。
  4. 根据权利要求2所述的升降压变换电路，其特征在于，所述电压变换模块包括电感L1，所述第二开关电路包括第二开关管Q2和第一二极管D1，其中：
    所述第一二极管D1的阴极连接所述电感L1的第一端和所述第二开关管Q2的第二端，所述第一二极管D1的阳极接地，所述电感L1的第二端连接所述第一开关电路；
    所述第二开关管Q2的第一端为所述升降压变换电路的输入端，所述第二开关管Q2的第三端为控制端，当所述第二开关管Q2导通时，所述电感L1的第二端生成所述数字电源电压DVDD。
  5. 根据权利要求3所述的升降压变换电路，其特征在于，所述第一开关电路还包括第二二极管D2，所述第二二极管D2的阳极连接所述电感L1的第二端，所述第二二极管D2的阴极引出所述模拟电源电压VAA的输出端。
  6. 根据权利要求4所述的升降压变换电路，其特征在于，所述第二开关电路还包括第三开关管Q3，所述第三开关管Q3的第一端连接所述电感L1的第二端，所述第三开关管Q3的第二端引出所述数字电源电压DVDD的输出端，所述第三开关管Q3的第三端为控制端。
  7. 根据权利要求3所述的升降压变换电路，其特征在于，所述第一开关管Q1为金属半导体氧化物场效应晶体管或者三极管。
  8. 根据权利要求6所述的升降压变换电路，其特征在于，所述第二开关管Q2和所述第三开关管Q3为金属半导体氧化物场效应晶体管或者三极管。
  9. 一种电源管理模块，其特征在于，所述电源管理模块包括升降压变换电路，所述升降压变换电路用于输出模拟电源电压VAA或数字电源电压DVDD，所述升降压变换电路包括：
    电压变换模块，用于将输入电压升压得到模拟电源电压VAA，或者，将所述输入电压降压得到数字电源电压DVDD；
    开关模块，用于控制所述电压变换模块对所述输入电压进行升压或降压。
  10. 根据权利要求9所述的电源管理模块，其特征在于，所述开关模块，包括第一开关电路和第二开关电路，其中：
    当所述第一开关电路导通时，所述第二开关电路关断，所述电压变换模块 将所述输入电压升压以得到所述模拟电源电压VAA；
    当所述第二开关电路导通时，所述第一开关电路关断，所述电压变换模块将所述输入电压降压以得到所述数字电源电压DVDD。
  11. 根据权利要求10所述的电源管理模块，其特征在于，所述电压变换模块包括电感L1，所述第一开关电路包括第一开关管Q1，其中：
    所述电感L1的第一端连接所述第二开关电路，所述电感L1的第二端连接所述第二开关电路和所述第一开关管Q1的第一端；
    所述第一开关管Q1的第二端接地，所述第一开关管Q1的第三端为控制端；
    当所述第一开关管Q1导通时，所述电感L1的第二端生成所述模拟电源电压VAA。
  12. 根据权利要求10所述的电源管理模块，其特征在于，所述电压变换模块包括电感L1，所述第二开关电路包括第二开关管Q2和第一二极管D1，其中：
    所述第一二极管D1的阴极连接所述电感L1的第一端和所述第二开关管Q2的第二端，所述第一二极管D1的阳极接地，所述电感L1的第二端连接所述第一开关电路；
    所述第二开关管Q2的第一端为所述升降压变换电路的输入端，所述第二开关管Q2的第三端为控制端，当所述第二开关管Q2导通时，所述电感L1的第二端生成所述数字电源电压DVDD。
  13. 根据权利要求11所述的电源管理模块，其特征在于，所述第一开关电路还包括第二二极管D2，所述第二二极管D2的阳极连接所述电感L1的第二端，所述第二二极管D2的阴极引出所述模拟电源电压VAA的输出端。
  14. 根据权利要求12所述的电源管理模块，其特征在于，所述第二开关电路还包括第三开关管Q3，所述第三开关管Q3的第一端连接所述电感L1的 第二端，所述第三开关管Q3的第二端引出所述数字电源电压DVDD的输出端，所述第三开关管Q3的第三端为控制端。
  15. 一种液晶驱动装置，其特征在于，所述液晶驱动装置包括电源管理模块，所述电源管理模块包括升降压变换电路，所述升降压变换电路用于输出模拟电源电压VAA或数字电源电压DVDD，所述升降压变换电路包括：
    电压变换模块，用于将输入电压升压得到模拟电源电压VAA，或者，将所述输入电压降压得到数字电源电压DVDD；
    开关模块，用于控制所述电压变换模块对所述输入电压进行升压或降压。
PCT/CN2015/077056 2015-03-20 2015-04-21 一种升降压变换电路、电源管理模块及液晶驱动装置 Ceased WO2016149973A1 (zh)

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