WO2020220449A1 - 电压转换电路 - Google Patents

电压转换电路 Download PDF

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Publication number
WO2020220449A1
WO2020220449A1 PCT/CN2019/092725 CN2019092725W WO2020220449A1 WO 2020220449 A1 WO2020220449 A1 WO 2020220449A1 CN 2019092725 W CN2019092725 W CN 2019092725W WO 2020220449 A1 WO2020220449 A1 WO 2020220449A1
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Prior art keywords
voltage conversion
voltage
conversion module
low potential
terminal
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English (en)
French (fr)
Inventor
刘代进
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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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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—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
    • H02M3/1563—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 without using an external clock

Definitions

  • LCD Liquid Crystal Display
  • PDA personal digital assistant
  • LCD TV mobile phone
  • PDA personal digital assistant
  • digital camera computer screen or notebook computer screen, etc.
  • the voltage conversion circuit includes a power management chip (PMIC) 100, a transistor T10, a first resistor R10, a diode D10, a capacitor C10, The second resistor R20 and the level conversion unit 200.
  • the output terminal of the power management chip 100 is electrically connected to the emitter of the transistor T10 to output the system low potential VGL.
  • the base of the transistor T10 is electrically connected to the anode of the diode D10, and the collector is electrically connected to the input end of the level conversion unit 200 to output the scan signal low potential Vssg to it.
  • the level conversion unit 200 converts the scan signal low potential Vssg. Output to GOA circuit.
  • the two ends of the first resistor R10 are respectively electrically connected to the base and the emitter of the transistor T10.
  • the cathode of the diode D10 is grounded.
  • One end of the capacitor C10 is electrically connected to the collector of the transistor T10, and the other end is grounded.
  • Two ends of the second resistor R20 are respectively electrically connected to two ends of the capacitor C10. The driving force of this voltage conversion circuit is insufficient.
  • the scan signal low potential Vssg will leak to the system low potential VGL, so that the scan signal low potential Vssg is actually controlled by the constant voltage low potential VGL, resulting in the key node low potential and scan signal A sufficient voltage difference cannot be guaranteed between low potentials, and thus the leakage current of the thin film transistor in the GOA circuit cannot be effectively reduced.
  • the above-mentioned problem is usually solved by changing the resistance of the second resistor R20, but the effect is poor.
  • the purpose of the present invention is to provide a voltage conversion circuit with high driving force and capable of outputting a stable constant voltage and low potential, so as to effectively reduce the leakage current in the GOA circuit.
  • the output terminal of the control signal generating module is electrically connected to the control terminal of the voltage conversion module to transmit the control signal to the control terminal of the voltage conversion module;
  • the input terminal of the voltage conversion module is connected to the power supply voltage for converting the power supply voltage under the control of the control signal to generate a constant voltage low potential, and the output terminal of the voltage conversion module outputs a constant voltage low potential.
  • the voltage conversion module includes a switch unit, an inductor, a diode, and a capacitor; the control terminal of the switch unit is the control terminal of the voltage conversion module, the first terminal is the input terminal of the voltage conversion module, and the second terminal is electrically connected to one end of the inductor
  • the switch unit is used to conduct or disconnect the first end and the second end of the switch unit under the control of the control signal; the other end of the inductor is grounded; the cathode of the diode is electrically connected to one end of the inductor, and the anode is The output terminal of the voltage conversion module; one end of the capacitor is electrically connected to the anode of the diode, and the other end is grounded.
  • the voltage conversion module further includes a resistor; both ends of the resistor are electrically connected to both ends of the capacitor.
  • the diode is a Schottky diode.
  • the maximum repeated peak reverse voltage of the diode is 40V, and the maximum average conversion current is 2A.
  • the switching unit is a field effect tube; the gate of the field effect tube is the control end of the switching unit, and the source and drain are the first end and the second end of the switching unit, respectively.
  • the output terminal of the voltage conversion module is used to electrically connect the GOA circuit; the constant voltage low potential is the scan signal low potential.
  • the power supply voltage is greater than zero.
  • FIG. 1 is a schematic diagram of the structure of an existing voltage conversion circuit
  • Figure 2 is a schematic diagram of the structure of the voltage conversion circuit of the present invention.
  • the present invention provides a voltage conversion circuit including a control signal generation module 10 and a voltage conversion module 20.
  • the output terminal of the control signal generating module 10 is electrically connected to the control terminal of the voltage conversion module 20 for transmitting control signals from the output terminal to the control terminal of the voltage conversion module 20.
  • the input terminal of the voltage conversion module 20 is connected to the power supply voltage VCC for converting the power supply voltage VCC under the control of the control signal to generate a constant voltage low potential VSSG, and the output terminal of the voltage conversion module 20 outputs a constant voltage low The potential VSSG.
  • the voltage conversion module 20 includes a switch unit 21, an inductor L1, a diode D1, and a capacitor C1.
  • the control terminal of the switch unit 21 is the control terminal of the voltage conversion module 20, the first terminal is the input terminal of the voltage conversion module 20, the second terminal is electrically connected to one end of the inductor L1, and the switch unit 21 is used for controlled signals The first end and the second end are turned on or off. The other end of the inductor L1 is grounded.
  • the cathode of the diode D1 is electrically connected to one end of the inductor L1 and the anode is the output terminal of the voltage conversion module 20.
  • One end of the capacitor C1 is electrically connected to the anode of the diode D1, and the other end is grounded.
  • the voltage conversion module 20 further includes a resistor R1.
  • the two ends of the resistor R1 are electrically connected to the two ends of the capacitor C1, respectively.
  • the diode D1 is a Schottky diode.
  • the maximum repeated peak reverse voltage of the diode D1 is 40V, and the maximum average conversion current is 2A.
  • the switch unit 21 is a field effect transistor Q1.
  • the gate of the field effect transistor Q1 is the control terminal of the switch unit 21, and the source and drain are the first terminal and the second terminal of the switch unit 21, respectively.
  • the switch unit 21 can also be a common switch unit such as thin film transistors, which will not affect the implementation of the present invention.
  • control signal generating module 10 is a power management chip.
  • the output terminal of the voltage conversion module 20 is used to electrically connect the GOA circuit 30.
  • the constant voltage low potential VSSG is the scan signal low potential, that is, the constant voltage low potential is connected to the pull-down module and pull-down maintenance module of each level of GOA unit in the GOA circuit 30, for pull-down and pull-down to maintain each level of GOA The scan signal of the unit.
  • the constant voltage low potential VSSG is -5V to -6V.
  • the power supply voltage VCC is greater than zero.
  • control signal generation module 10 transmits a control signal from its output terminal to the control terminal of the voltage conversion module 20, and the voltage conversion module 20 controls the power supply voltage VCC under the control of the control signal. Converted to generate a constant voltage low potential VSSG and output to the GOA circuit from its output end.
  • the driving capability of the voltage conversion circuit of the present invention is improved by one Order of magnitude, strong driving capability, capable of outputting a stable constant voltage low potential VSSG, effectively avoiding the leakage between the scan signal low potential and the system low potential in the prior art, which causes the system low potential to pull down the scan signal low potential, effectively ensuring the The voltage difference between the constant voltage low potential VSSG used as the scanning signal and the low potential used to pull down and maintain the key nodes in the GOA circuit, thereby effectively reducing the leakage current in the GOA circuit and improving the reliability of the GOA circuit.
  • the voltage conversion circuit of the present invention includes a control signal generation module and a voltage conversion module.
  • the output end of the control signal generation module is electrically connected to the control end of the voltage conversion module, and the input end of the voltage conversion module is connected to the power supply voltage to work
  • the control signal generation module transmits the control signal from its output terminal to the control terminal of the voltage conversion module
  • the voltage conversion module converts the power supply voltage under the control of the control signal to generate a constant voltage and low potential, which is output by its output terminal, with strong driving ability , It can output a stable constant voltage low potential to effectively reduce the leakage current in the GOA circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本发明提供一种电压转换电路。所述电压转换电路包括控制信号产生模块及电压转换模块，控制信号产生模块的输出端电性连接电压转换模块的控制端，电压转换模块的输入端接入电源电压，工作时，控制信号产生模块由其输出端向电压转换模块的控制端传输控制信号，电压转换模块在控制信号的控制下对电源电压进行转换产生恒压低电位并由其输出端输出。本发明驱动能力强，能够输出稳定的恒压低电位，以有效降低GOA电路中的漏电流。

Description

电压转换电路 技术领域
本发明涉及显示技术领域，尤其涉及一种电压转换电路。
 背景技术
液晶显示器（Liquid Crystal Display，LCD）具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。如：液晶电视、移动电话、个人数字助理（PDA）、数字相机、计算机屏幕或笔记本电脑屏幕等，在平板显示领域中占主导地位。
GOA（Gate Driver on Array）技术即阵列基板行驱动技术，是利用薄膜晶体管（Thin Film Transistor，TFT）液晶显示器阵列制程将栅极扫描驱动电路制作在薄膜晶体管阵列基板上，以实现逐行扫描的驱动方式，具有降低生产成本和实现面板窄边框设计的优点，为多种显示器所使用。GOA电路具有两项基本功能：第一是输出栅极扫描驱动信号，驱动面板内的栅极线，打开显示区内的TFT，以对像素进行充电；第二是移位寄存功能，当一个栅极扫描驱动信号输出完成后，通过时钟控制进行下一个栅极扫描驱动信号的输出，并依次传递下去。GOA技术能减少外接芯片（IC）的焊接（bonding）工序，有机会提升产能并降低产品成本，而且可以使液晶显示面板更适合制作窄边框的显示产品。
现有技术中，为了对GOA电路中的关键节点以及GOA电路输出的扫描信号进行下拉及下拉维持，并且减少下拉扫描信号的薄膜晶体管的漏电流，需要分别向GOA电路传输关键节点低电位以及扫描信号低电位，关键节点低电位要低于扫描信号低电位（一般两者之间的差值为2V以上）。其中，扫描信号低电位由低于扫描信号低电位的系统低电位搭配稳压电路产生，关键节点低电位由系统低电位产生。请参阅图1，为现有的用于产生扫描信号低电位的电压转换电路的电路图，该电压转换电路包括电源管理芯片（PMIC）100、三极管T10、第一电阻R10、二极管D10、电容C10、第二电阻R20及电平转换单元200。电源管理芯片100的输出端电性连接三极管T10的发射极以输出系统低电位VGL。三极管T10的基极电性连接二极管D10的阳极，集电极电性连接电平转换单元200的输入端向其输出扫描信号低电位Vssg，由电平转换单元200对扫描信号低电位Vssg进行转换后输出至GOA电路中。第一电阻R10的两端分别电性连接三极管T10的基极及发射极。二极管D10的阴极接地。电容C10的一端电性连接三极管T10的集电极，另一端接地。第二电阻R20的两端分别电性连接电容C10的两端。此电压转换电路的驱动力不足，实际工作时扫描信号低电位Vssg会向系统低电位VGL漏电，使得扫描信号低电位Vssg实际上受到恒压低电位VGL的控制，导致关键节点低电位与扫描信号低电位之间无法保证足够的压差，进而无法有效降低GOA电路中薄膜晶体管的漏电流，通常通过改变第二电阻R20的阻值以解决上述问题，然而效果较差。
 技术问题
本发明的目的在于提供一种电压转换电路，驱动力高，能够输出稳定的恒压低电位，以有效降低GOA电路中的漏电流。
 技术解决方案
为实现上述目的，本发明提供一种电压转换电路，包括控制信号产生模块及电压转换模块；
所述控制信号产生模块的输出端电性连接电压转换模块的控制端以向电压转换模块的控制端传输控制信号；
所述电压转换模块的输入端接入电源电压，用于在控制信号的控制下对电源电压进行转换以产生恒压低电位，所述电压转换模块的输出端输出恒压低电位。
所述电压转换模块包括开关单元、电感、二极管及电容；所述开关单元的控制端为电压转换模块的控制端，第一端为电压转换模块的输入端，第二端电性连接电感的一端，所述开关单元用于受控制信号的控制而将其第一端与第二端导通或断开；所述电感的另一端接地；所述二极管的阴极电性连接电感的一端，阳极为电压转换模块的输出端；所述电容的一端电性连接二极管的阳极，另一端接地。
所述电压转换模块还包括电阻；所述电阻的两端分别电性连接电容的两端。
所述二极管为肖特基二极管。
所述二极管的最大反复峰值反向电压为40V，最大平均转换电流为2A。
所述开关单元为场效应管；所述场效应管的栅极为开关单元的控制端，源极及漏极分别为开关单元的第一端及第二端。
所述控制信号产生模块为电源管理芯片。
所述电压转换模块的输出端用于电性连接GOA电路；所述恒压低电位为扫描信号低电位。
所述恒压低电位为-5V~-6V。
所述电源电压大于0。
 有益效果
本发明的有益效果：本发明的电压转换电路包括控制信号产生模块及电压转换模块，控制信号产生模块的输出端电性连接电压转换模块的控制端，电压转换模块的输入端接入电源电压，工作时，控制信号产生模块由其输出端向电压转换模块的控制端传输控制信号，电压转换模块在控制信号的控制下对电源电压进行转换产生恒压低电位并由其输出端输出，驱动能力强，能够输出稳定的恒压低电位，以有效降低GOA电路中的漏电流。
 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为现有的电压转换电路的结构示意图；
图2为本发明的电压转换电路的结构示意图。
 本发明的实施方式
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2，本发明提供一种电压转换电路，包括控制信号产生模块10及电压转换模块20。
所述控制信号产生模块10的输出端电性连接电压转换模块20的控制端，用于由其输出端向电压转换模块20的控制端传输控制信号。
所述电压转换模块20的输入端接入电源电压VCC，用于在控制信号的控制下对电源电压VCC进行转换以产生恒压低电位VSSG，所述电压转换模块20的输出端输出恒压低电位VSSG。
具体地，所述电压转换模块20包括开关单元21、电感L1、二极管D1及电容C1。所述开关单元21的控制端为电压转换模块20的控制端，第一端为电压转换模块20的输入端，第二端电性连接电感L1的一端，所述开关单元21用于受控制信号的控制而将其第一端与第二端导通或断开。所述电感L1的另一端接地。所述二极管D1的阴极电性连接电感L1的一端，阳极为电压转换模块20的输出端。所述电容C1的一端电性连接二极管D1的阳极，另一端接地。
进一步地，在图2所示的实施例中，所述电压转换模块20还包括电阻R1。所述电阻R1的两端分别电性连接电容C1的两端。
优选地，所述二极管D1为肖特基二极管。
更优选地，所述二极管D1的最大反复峰值反向电压为40V，最大平均转换电流为2A。
具体地，在图2所示的实施例中，所述开关单元21为场效应管Q1。所述场效应管Q1的栅极为开关单元21的控制端，源极及漏极分别为开关单元21的第一端及第二端。当然，在本发明的其他实施例中，所述开关单元21也可以选择薄膜晶体管等常见的开关单元，这并不会影响本发明的实现。
优选地，所述控制信号产生模块10为电源管理芯片。
具体地，所述电压转换模块20的输出端用于电性连接GOA电路30。所述恒压低电位VSSG为扫描信号低电位，也即该恒压低电位接入GOA电路30中的每一级GOA单元的下拉模块及下拉维持模块，用于下拉及下拉维持每一级GOA单元的扫描信号。
优选地，所述恒压低电位VSSG为-5V~-6V。
具体地，所述电源电压VCC大于0。
需要说明的是，本发明的电压转换电路在工作时，控制信号产生模块10由其输出端向电压转换模块20的控制端传输控制信号，电压转换模块20在控制信号的控制下对电源电压VCC进行转换以产生恒压低电位VSSG并由其输出端输出至GOA电路中，相比于现有技术中用于产生扫描信号低电位的电压转换电路，本发明的电压转换电路的驱动能力提升一个数量级，驱动能力强，能够输出稳定的恒压低电位VSSG，有效地避免现有技术中扫描信号低电位与系统低电位之间漏电导致系统低电位将扫描信号低电位下拉，有效地保证用于作为扫描信号的恒压低电位VSSG与用于下拉及下拉维持GOA电路中关键节点的低电位之间的电压差，从而以有效降低GOA电路中的漏电流，提升GOA电路的可靠性。
综上所述，本发明的电压转换电路包括控制信号产生模块及电压转换模块，控制信号产生模块的输出端电性连接电压转换模块的控制端，电压转换模块的输入端接入电源电压，工作时，控制信号产生模块由其输出端向电压转换模块的控制端传输控制信号，电压转换模块在控制信号的控制下对电源电压进行转换产生恒压低电位并由其输出端输出，驱动能力强，能够输出稳定的恒压低电位，以有效降低GOA电路中的漏电流。
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 (10)

  1. 一种电压转换电路，包括控制信号产生模块及电压转换模块；
    所述控制信号产生模块的输出端电性连接电压转换模块的控制端以向电压转换模块的控制端传输控制信号；
    所述电压转换模块的输入端接入电源电压，用于在控制信号的控制下对电源电压进行转换以产生恒压低电位，所述电压转换模块的输出端输出恒压低电位。
  2. 如权利要求1所述的电压转换电路，其中，所述电压转换模块包括开关单元、电感、二极管及电容；所述开关单元的控制端为电压转换模块的控制端，第一端为电压转换模块的输入端，第二端电性连接电感的一端，所述开关单元用于受控制信号的控制而将其第一端与第二端导通或断开；所述电感的另一端接地；所述二极管的阴极电性连接电感的一端，阳极为电压转换模块的输出端；所述电容的一端电性连接二极管的阳极，另一端接地。
  3. 如权利要求2所述的电压转换电路，其中，所述电压转换模块还包括电阻；所述电阻的两端分别电性连接电容的两端。
  4. 如权利要求2所述的电压转换电路，其中，所述二极管为肖特基二极管。
  5. 如权利要求4所述的电压转换电路，其中，所述二极管的最大反复峰值反向电压为40V，最大平均转换电流为2A。
  6. 如权利要求2所述的电压转换电路，其中，所述开关单元为场效应管；所述场效应管的栅极为开关单元的控制端，源极及漏极分别为开关单元的第一端及第二端。
  7. 如权利要求1所述的电压转换电路，其中，所述控制信号产生模块为电源管理芯片。
  8. 如权利要求1所述的电压转换电路，其中，所述电压转换模块的输出端用于电性连接GOA电路；所述恒压低电位为扫描信号低电位。
  9. 如权利要求8所述的电压转换电路，其中，所述恒压低电位为-5V~-6V。
  10. 如权利要求1所述的电压转换电路，其中，所述电源电压大于0。
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