WO2020015197A1 - 侦测输入电压上升速度的电路及方法 - Google Patents

侦测输入电压上升速度的电路及方法 Download PDF

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WO2020015197A1
WO2020015197A1 PCT/CN2018/108582 CN2018108582W WO2020015197A1 WO 2020015197 A1 WO2020015197 A1 WO 2020015197A1 CN 2018108582 W CN2018108582 W CN 2018108582W WO 2020015197 A1 WO2020015197 A1 WO 2020015197A1
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voltage
result
reference voltage
input
terminal
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PCT/CN2018/108582
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English (en)
French (fr)
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张先明
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深圳市华星光电半导体显示技术有限公司
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Priority to US16/321,828 priority Critical patent/US20210116480A1/en
Publication of WO2020015197A1 publication Critical patent/WO2020015197A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/12—Measuring rate of change
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/026—Arrangements or methods related to booting a display

Definitions

  • the present invention relates to the field of display technology, and in particular, to a circuit and method for detecting a rising speed of an input voltage.
  • liquid crystal display devices are backlight type liquid crystal displays, which include a liquid crystal display panel and a backlight module.
  • the power management circuit of the liquid crystal display device provides various voltages, such as an analog voltage AVDD, a gate-on voltage VGH, a gate-off voltage VGL, and a common electrode voltage VCOM, to drive the liquid crystal display device to perform screen display.
  • various voltages such as an analog voltage AVDD, a gate-on voltage VGH, a gate-off voltage VGL, and a common electrode voltage VCOM, to drive the liquid crystal display device to perform screen display.
  • the size of liquid crystal panels is getting larger and larger, and the voltage and current required by them are also getting larger.
  • the capacitance used for each voltage is also large, and the requirements for the input voltage VIN will also be more and more High, requires accurate range of input voltage VIN, small voltage drop under different loadings, proper rise speed, etc.
  • the current power management circuit does not have a design to detect the rising speed of the input voltage VIN. In fact, if the rising speed is very fast, it may cause a large inrush current. If the rising speed is very slow, it may cause the system It is in a low-voltage working state when it is turned on. Both of these conditions may cause damage to the panel driver, causing great problems, such as damage to the fuse and damage to the back-end chip (IC). Wait.
  • an object of the present invention is to provide a circuit for detecting a rising speed of an input voltage, and detecting a rising speed of an input voltage in a power management circuit.
  • Another object of the present invention is to provide a method for detecting a rising speed of an input voltage, and detecting a rising speed of an input voltage in a power management circuit.
  • the present invention provides a circuit for detecting a rising speed of an input voltage, including:
  • a voltage dividing circuit for dividing an input voltage to provide a first voltage
  • the charging circuit includes a capacitor, a switch, and a current source.
  • the current source is connected to the input terminal of the switch, the output terminal of the switch is connected to the first terminal of the capacitor, the second terminal of the capacitor is grounded, and the control terminal of the switch is connected to the first comparator.
  • An output terminal, the first terminal of the capacitor provides a second voltage;
  • a first comparator configured to compare a first input voltage and a first reference voltage, and output a comparison result to control the switch
  • a second comparator configured to compare an input second voltage and a fourth reference voltage, and output a first result
  • a third comparator configured to compare the input second voltage with a third reference voltage, and output a second result
  • a fourth comparator is used to compare the input first voltage and the second reference voltage, and output a third result, the third result is an enable signal of the logic judge; when the first voltage is greater than the second reference voltage, the The third result enables the logic judger;
  • a logic judger configured to receive the first result, the second result, and the third result, and determine whether a logical judgment is required according to the third result; when it is determined that a logical judgment is required, according to the preset logic, the first result, and the second The result judges the rising speed of the input voltage and outputs the fourth result;
  • the third reference voltage is greater than the fourth reference voltage, and the second reference voltage is greater than the first reference voltage.
  • the logic determiner determines the rising speed of the input voltage according to the preset logic, the first result, and the second result, and the output of the fourth result includes:
  • the logic determiner determines that the input voltage rises too quickly
  • the logic judger judges that the input voltage rising speed is normal
  • the logic determiner determines that the input voltage rise rate is too slow.
  • the logic determiner sends the fourth result to the system-level chip, so that the system-level chip controls the rising speed of the input voltage generated by the AC / DC conversion circuit according to the fourth result.
  • the comparison result output by the first comparator controls the switch to be closed.
  • the voltage dividing circuit includes a first resistor and a second resistor, a first terminal of the first resistor is connected to an input voltage, a second terminal of the first resistor is connected to a first terminal of the second resistor, and a first voltage is provided, The second terminal of the second resistor is grounded.
  • the switch is a transistor or a metal oxide semiconductor transistor.
  • the non-inverting input terminal of the first comparator inputs a first voltage, and the inverting input terminal inputs a first reference voltage;
  • the non-inverting input terminal of the second comparator inputs a second voltage, and the inverting input terminal inputs a fourth reference voltage;
  • the non-inverting input terminal of the third comparator inputs the second voltage, and the inverting input terminal inputs the third reference voltage;
  • the non-inverting input terminal of the fourth comparator inputs the first voltage, and the inverting input terminal inputs the second reference voltage.
  • the invention also provides a method for detecting the rising speed of the input voltage, which is applied to the circuit for detecting the rising speed of the input voltage according to any one of the above, and includes:
  • the voltage dividing circuit divides the input voltage to provide a first voltage
  • the switch controls whether the current source charges the capacitor, and the first terminal of the capacitor provides a second voltage
  • the first comparator compares the first voltage and the first reference voltage, and the output comparison result is used to control the switch;
  • the second comparator compares the second voltage and the fourth reference voltage, and outputs a first result
  • a third comparator compares the second voltage with a third reference voltage, and outputs a second result
  • a fourth comparator compares the first voltage and the second reference voltage, and outputs a third result
  • the logic judger receives the first result, the second result, and the third result, and determines whether a logical judgment is required according to the third result. When it is determined that a logical judgment is required, it judges the input according to the preset logic, the first result, and the second result. Speed of voltage rise, output the fourth result;
  • the third reference voltage is greater than the fourth reference voltage, and the second reference voltage is greater than the first reference voltage.
  • the logic judger determining whether a logic judgment is required according to a third result includes: when the first voltage is greater than a second reference voltage, the logic judger determines that a logic judgment is required according to the third result.
  • the logic determiner determines the rising speed of the input voltage according to the preset logic, the first result, and the second result, and the output of the fourth result includes:
  • the circuit and method for detecting a rising speed of an input voltage can detect the rising speed of an input voltage within a power management circuit.
  • the startup input voltage rising rate is greater than or less than a preset required value , It will be determined that an abnormality has occurred, and an abnormality can be fed back to avoid working in an abnormal state.
  • FIG. 1 is a schematic diagram of a circuit for detecting a rising speed of an input voltage according to the present invention
  • FIG. 2 is a block diagram of an application scenario of a circuit for detecting a rising speed of an input voltage according to a preferred embodiment of the present invention.
  • FIG. 1 a schematic diagram of a circuit for detecting a rising speed of an input voltage according to the present invention is shown.
  • the circuit for detecting the rising speed of the input voltage mainly includes: a voltage dividing circuit 1, a charging circuit 2 composed of a capacitor C1, a switch K, and a direct current (DC) current source, first to fourth comparators OP1 to OP4, and a logic judgment Device.
  • the circuit shown in FIG. 1 is only used to illustrate the present invention, and those skilled in the art can make various other corresponding changes and modifications according to the technical solutions and technical concepts of the present invention.
  • a voltage dividing circuit 1 is used to divide an input voltage VIN to provide a first voltage V1.
  • the voltage dividing circuit 1 may specifically include a first resistor R1 and a second resistor R2.
  • a first terminal of the first resistor R1 is connected to an input.
  • Voltage, the second terminal of the first resistor R1 and the first terminal of the second resistor R2 are connected to provide a first voltage V1, and the second terminal of the second resistor R2 is grounded; that is, the first voltage V1 is collected from the first resistor R1 And the second resistor R2 to sample the input voltage VIN.
  • the charging circuit 2 includes a switch K, a capacitor C1, and a current source.
  • the direct current (DC) current source is controlled by the switch K to charge the capacitor C1.
  • the second terminal of the capacitor C1 is grounded.
  • the first terminal is connected to the output terminal of the switch K.
  • the input end is connected to a current source, and the other end of the capacitor C1 provides a second voltage V2;
  • the switch K may be a transistor or a MOS tube, or other applicable switching elements.
  • the first comparator OP1 is used to compare the first voltage V1 and the first reference voltage VREF1, and the output comparison result is used to control the switch K of the charging circuit 2. In this preferred embodiment, it is set to be when the first voltage V1 is greater than When the first reference voltage VREF1, the first comparator OP1 controls the switch K of the charging circuit 2 to be closed, and the current source charges the capacitor C1; the first reference voltage VREF1 is a starting point for detecting the rising speed of the input voltage VIN;
  • the second comparator OP2 is configured to compare the second voltage V2 and the fourth reference voltage VREF4, and output a first result L;
  • the third comparator OP3 is configured to compare the second voltage V2 and the third reference voltage VREF3, and output a second result M;
  • the fourth comparator OP4 is used to compare the first voltage V1 and the second reference voltage VREF2, and output a third result N.
  • the third result N is an enable signal of the logic judger. When the first voltage V1 is satisfied, it is greater than the second reference voltage VREF2. , The third result N enables the logic judger; the second reference voltage VREF2 is an end point for calculating the rise time of the input voltage VIN;
  • the third reference voltage VREF3 is greater than the fourth reference voltage VREF4, and the second reference voltage VREF2 is greater than the first reference voltage VREF1.
  • the present invention detects the rising speed of the input voltage VIN by setting four reference voltages. In this embodiment, The four reference voltages are input to the inverting input of the corresponding comparator.
  • the current source and the capacitor C1 are preset, and the second voltage V2 on the capacitor C1 after charging is time-dependent.
  • the second voltage V2 By comparing the second voltage V2 with a preset third reference voltage VREF3 and a fourth reference voltage VREF4, The time rising interval of the input voltage VIN is set as a reference for comparing its rising speed.
  • the present invention first divides the input voltage VIN to obtain a first voltage V1. This voltage is first compared with the first reference voltage VREF1. This voltage point is the starting point for detecting the rising speed of the input voltage VIN.
  • the first comparator OP1 may output a high level to control the switch K of the charging circuit 2 to charge the capacitor C1.
  • the charging time and result of the capacitor C1 are determined by the second comparator OP2 and the third comparator OP3, and the second reference voltage VREF2 is an end point for calculating the rise time of the input voltage VIN.
  • the input voltage VIN rises with time
  • the first voltage V1 obtained by dividing the input voltage VIN also rises with time.
  • a voltage rising interval of the input voltage VIN is set in advance as a reference for comparing the rising speed thereof.
  • the logic judger is configured to receive the first result L, the second result M, and the third result N, and determine whether a logical judgment is required according to the third result N. When it is determined that a logical judgment is required, according to a preset logic, the first result L The second result M determines the input voltage rising speed, and outputs the fourth result Q.
  • the logic determiner may be implemented by using a logic circuit, a single-chip microcomputer, a CPU, or an FPGA.
  • the logic judger judges the rising speed of the input voltage according to the preset logic, the first result L and the second result M.
  • the preset logic for determining the rising speed of the input voltage according to the present invention may include: if the second voltage V2 is smaller than the fourth reference voltage VREF4 If the second voltage V2 is greater than the fourth reference voltage VREF4 and less than the third reference voltage VREF3, the input voltage rises normally. If the second voltage V2 is greater than the fourth reference voltage VREF3, the input voltage rises too quickly. The reference voltage VREF4 is greater than the third reference voltage VREF3, and it is determined that the rising speed of the input voltage is too slow.
  • the first result L, the second result M, and the third result N may all be set to be represented by 0 or 1.
  • the preset logic may specifically include: the third result N is The enable signal of the logic judger. If the third result N is 1, the value of the first result L / the second result M will be read. If the third result N is 0, it can be set to no operation. One result L / second result M is 0, it proves that the rising speed is too fast, and the time for the input voltage VIN to rise from the first reference voltage VREF1 to the second reference voltage VREF2 is not enough; if the first result L is 1, The second result M is 0. At this time, the rising speed is within the preset specifications, and normal booting can be performed. If the first result L / the second result M is 1 at the same time, it is proved that the rising speed is too slow and has exceeded the preset specifications. , May also cause problems and cause subsequent exceptions.
  • the invention can determine the rising speed of the input voltage VIN of the panel drive through this circuit. By setting the normal range of the rising speed in advance, it can ensure normal operation within the normal range of rising speed. If the rising speed is abnormal, it will determine that a problem occurs. You can further set it to not boot.
  • FIG. 2 a block diagram of an application scenario of a circuit for detecting a rising speed of an input voltage according to the present invention is shown.
  • An alternating current direct current (ACDC) conversion circuit 10 generates an input voltage VIN and outputs it to a system-level chip (SOC) 20.
  • SOC system-level chip
  • the system-level chip 20 then inputs the input voltage VIN to a control board (CB) 30.
  • the present invention detects
  • the circuit 50 may be built in a power management circuit (PMIC) 40 on the control board 30, so that the rising speed of the input voltage VIN can be detected.
  • PMIC power management circuit
  • the circuit 50 for detecting the rising speed of the input voltage of the present invention may also be combined with the system segment, and feed back the fourth result Q output by the logic judger to the system-level chip 20, and control the AC-DC conversion circuit 10 to generate the rising speed of the input voltage VIN. .
  • the logic determiner judges the rising speed of the input voltage VIN according to a preset logic, the logic determiner outputs a fourth result Q, and the fourth result Q can be input to the system-level chip 20, and the system-level chip 20
  • the chip 20 controls the AC-DC conversion circuit 10 to generate the rising speed of the input voltage VIN and / or the system-level chip 20 controls the startup operation according to the fourth result Q:
  • the system-level chip 20 controls the AC-DC conversion
  • the circuit 10 reduces the rising speed of the input voltage VIN; when the rising speed of the input voltage VIN is normal, the system-level chip 20 controls the normal startup; when the rising speed of the input voltage VIN is too slow, the system-level chip 20 controls the AC-DC conversion circuit 10 to increase the input voltage VIN rising speed.
  • the specific method can be as follows, the fourth result Q is fed back to the SoC 20, and the fourth result Q format is no longer set to 0/1, but becomes a voltage value, for example, 0 / 1.5 / 3.3V. , It proves that the rising speed is too fast, the system-level chip 20 controls the AC-DC conversion circuit 10 to restart the input voltage VIN, and reduces the rising speed of the input voltage VIN. If the fourth result Q voltage is 3.3V, it proves that the rising speed of the input voltage VIN is too fast. Slow. At this time, the AC / DC conversion circuit 10 is also controlled to increase the rising speed of the input voltage VIN. If the fourth result Q feedback level is 1.5V, it is determined to be normally started.
  • the invention also provides a method for detecting the rising speed of the input voltage, which can be implemented based on the circuit for detecting the rising speed of the input voltage, which mainly includes the following steps:
  • the voltage dividing circuit 1 divides the input voltage to obtain a first voltage V1;
  • the first comparator OP1 compares the first voltage V1 and the first reference voltage VREF1, and the output comparison result is used to control the switch K of the charging circuit 2;
  • the second comparator OP2 compares the second voltage V2 and the fourth reference voltage VREF4, and outputs a first result L;
  • the third comparator OP3 compares the second voltage V2 and the third reference voltage VREF3, and outputs a second result M;
  • the fourth comparator OP4 compares the first voltage V1 and the second reference voltage VREF2, outputs a third result N, and determines whether to perform a logical judgment based on the third result N. When the first voltage V1 is satisfied that is greater than the second reference voltage VREF2, Three results N are determined for logical judgment;
  • the logic determiner receives the first result L, the second result M, and the third result N, and determines whether a logical judgment is required according to the third result N. When it is determined that a logical judgment is required, according to a preset logic, the first result L and The second result M judges the rising speed of the input voltage and outputs a fourth result Q;
  • the third reference voltage VREF3 is greater than the fourth reference voltage VREF4, and the second reference voltage VREF2 is greater than the first reference voltage VREF1.
  • the logic determiner determines whether a logic judgment is required according to the third result N.
  • the logic judge determines that a logic judgment is required according to the third result N.
  • the second voltage V2 is compared with the preset third reference voltage VREF3 and the fourth reference voltage VREF4, respectively, and a time rising interval of the input voltage VIN is set in advance as a reference for comparing its rising speed.
  • a voltage rising interval of the input voltage VIN is set in advance as a reference for comparing its rising speed.
  • the logic determiner determines the rising speed of the input voltage according to the preset logic, the first result L, and the second result M.
  • the output of the fourth result Q may include:
  • the second voltage V2 is less than the fourth reference voltage VREF4 and less than the third reference voltage VREF3, it is determined that the input voltage rises too quickly; if the second voltage V2 is greater than the fourth reference voltage VREF4 and less than the third reference voltage VREF3, it is determined that the input voltage has risen.
  • the speed is normal; if the second voltage V2 is greater than the fourth reference voltage VREF4 and the third reference voltage VREF3, it is determined that the input voltage rising speed is too slow.
  • the present invention detects the rising speed of the input voltage VIN by setting four reference voltages.
  • the circuit and method for detecting a rising speed of an input voltage can detect the rising speed of an input voltage within a power management circuit.
  • the startup input voltage rising rate is greater than or less than a preset required value , It will be determined that an abnormality has occurred, and an abnormality can be fed back to avoid working in an abnormal state.

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Abstract

一种侦测输入电压上升速度的电路及方法。该电路包括：分压电路（1）提供第一电压；充电电路（2）包括电容C1、开关K及电流源，提供第二电压；第一比较器OP1输出的比较结果用于控制所述开关K；第二比较器OP2输出第一结果L；第三比较器OP3输出第二结果M；第四比较器OP4输出第三结果N；逻辑判断器，用于接收第一结果L、第二结果M及第三结果N，并根据第三结果N确定是否需要进行逻辑判断，当确定需要进行逻辑判断时，根据预设逻辑、第一结果L和第二结果M判断输入电压上升速度，输出第四结果Q。该电路可以在电源管理电路内部进行输入电压上升速度的侦测。

Description

侦测输入电压上升速度的电路及方法 技术领域
本发明涉及显示技术领域，尤其涉及一种侦测输入电压上升速度的电路及方法。
背景技术
随着显示技术的发展，液晶显示装置等平面显示装置因具有高画质、省电、机身薄及应用范围广等优点，而被广泛的应用于手机、电视、个人数字助理、数字相机、笔记本电脑、台式计算机等各种消费性电子产品，成为显示装置中的主流。
现有液晶显示装置大部分为背光型液晶显示器，其包括液晶显示面板及背光模组。
液晶显示装置的电源管理电路提供各种电压，例如模拟电压AVDD，栅极开启电压VGH，栅极关断电压VGL，以及公共电极电压VCOM等，以驱动液晶显示装置进行画面显示。
目前液晶面板的尺寸越来越大，其所需要的电压与电流也越来越大，在这种情况下，各个电压使用的电容也很大，同时对于输入电压VIN的要求也会越来越高，要求输入电压VIN的范围精确，在不同负载(loading)下压降小，上升速度适当等等。
现在的电源管理电路(PMIC)都没有侦测输入电压VIN上升速度的设计，实际上如果上升速度很快很可能会造成很大的浪涌(inrush)电流，如果上升速度很慢就可能导致系统在开机的时候处于低电压的工作状态，这两种情况都可能会造成面板驱动的损坏，带来很大的问题(issue)，例如，保险丝(Fuse)损伤，后端芯片(IC)损坏等等。
发明内容
因此，本发明的目的在于提供一种侦测输入电压上升速度的电路，在电源管理电路内部进行输入电压上升速度的侦测。
本发明的另一目的在于提供一种侦测输入电压上升速度的方法，在电源管理电路内部进行输入电压上升速度的侦测。
为实现上述目的，本发明提供了一种侦测输入电压上升速度的电路，包括：
分压电路，用于将输入电压分压以提供第一电压；
充电电路，其包括电容、开关及电流源，该电流源连接开关的输入端，该开关的输出端连接电容的第一端，电容的第二端接地，该开关的控制端连接第一比较器的输出端，该电容的第一端提供第二电压；
第一比较器，用于比较输入的第一电压和第一参考电压，输出的比较结果用于控制所述开关；
第二比较器，用于比较输入的第二电压和第四参考电压，输出第一结果；
第三比较器，用于比较输入的第二电压和第三参考电压，输出第二结果；
第四比较器，用于比较输入的第一电压和第二参考电压，输出第三结果，该第三结果为逻辑判断器的使能信号；当满足第一电压大于第二参考电压时，该第三结果使能逻辑判断器；
逻辑判断器，用于接收第一结果、第二结果及第三结果，并根据第三结果确定是否需要进行逻辑判断，当确定需要进行逻辑判断时，根据预设逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果；
其中，第三参考电压大于第四参考电压，第二参考电压大于第一参考电压。
其中，所述逻辑判断器根据预设逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果包括：
若第二电压小于第四参考电压且小于第三参考电压，则逻辑判断器判断输入电压上升速度过快；
若第二电压大于第四参考电压且小于第三参考电压，则逻辑判断器判断输入电压上升速度正常；
若第二电压大于第四参考电压且大于第三参考电压，则逻辑判断器判断输入电压上升速度过慢。
其中，所述逻辑判断器将第四结果发送给系统级芯片，供所述系统级芯片根据第四结果控制交流直流转换电路产生输入电压的上升速度。
其中，当第一电压大于第一参考电压时，第一比较器输出的比较结果控制所述开关闭合。
其中，所述分压电路包括第一电阻和第二电阻，第一电阻的第一端连接输入电压，第一电阻的第二端和第二电阻的第一端相连接并提供第一电压，第二电阻的第二端接地。
其中，所述开关为三极管或金属氧化物半导体晶体管。
其中：
第一比较器的同相输入端输入第一电压，反相输入端输入第一参考电压；
第二比较器的同相输入端输入第二电压，反相输入端输入第四参考电压；
第三比较器的同相输入端输入第二电压，反相输入端输入第三参考电压；
第四比较器的同相输入端输入第一电压，反相输入端输入第二参考电压。
本发明还提供了一种侦测输入电压上升速度的方法，应用于上述任一项所述的侦测输入电压上升速度的电路，包括：
分压电路将输入电压分压以提供第一电压；
充电电路中，由开关控制电流源是否对电容充电，电容的第一端提供第二电压；
第一比较器比较第一电压和第一参考电压，输出的比较结果用于控制所述开关；
第二比较器比较第二电压和第四参考电压，输出第一结果；
第三比较器比较第二电压和第三参考电压，输出第二结果；
第四比较器比较第一电压和第二参考电压，输出第三结果；
逻辑判断器接收第一结果、第二结果及第三结果，并根据第三结果确定是否需要进行逻辑判断，当确定需要进行逻辑判断时，根据预设逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果；
其中，第三参考电压大于第四参考电压，第二参考电压大于第一参考电压。
其中，所述逻辑判断器根据第三结果确定是否需要进行逻辑判断包括：当第一电压大于第二参考电压时，所述逻辑判断器根据该第三结果确定需要进行逻辑判断。
其中，所述逻辑判断器根据预设逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果包括：
若第二电压小于第四参考电压且小于第三参考电压，判断输入电压上升速度过快；
若第二电压大于第四参考电压且小于第三参考电压，判断输入电压上升速度正常；
若第二电压大于第四参考电压且大于第三参考电压，判断输入电压上 升速度过慢。
综上，本发明的侦测输入电压上升速度的电路及方法可以在电源管理电路内部进行输入电压上升速度的侦测，通过采用本发明，若开机输入电压上升速度大于或者小于预设的要求值，就会判定发生异常，并可以反馈出异常，避免在不正常的状态下一直工作。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为本发明侦测输入电压上升速度的电路的原理示意图；
图2为本发明侦测输入电压上升速度的电路一较佳实施例的应用场景方框图。
具体实施方式
参见图1，其为本发明侦测输入电压上升速度的电路的原理示意图。该侦测输入电压上升速度的电路主要包括：分压电路1，由电容C1、开关K及直流(DC)电流源组成的充电电路2，第一至第四比较器OP1～OP4，以及逻辑判断器。图1所示电路仅用于举例说明本发明，本领域技术人员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。
图1中，分压电路1用于将输入电压VIN分压以提供第一电压V1，分压电路1具体可以包括第一电阻R1和第二电阻R2，第一电阻R1的第一端连接输入电压，第一电阻R1的第二端和第二电阻R2的第一端相连接并提供第一电压V1，第二电阻R2的第二端接地；即，第一电压V1采集自第一电阻R1和第二电阻R2之间的连接点，从而对输入电压VIN进行采样。
充电电路2包括开关K、电容C1及电流源，该直流(DC)电流源由开关K控制是否对电容C1充电，电容C1第二端接地，第一端连接开关K的输出端，开关K的输入端连接电流源，电容C1的另一端提供第二电压V2；开关K可以为三极管或MOS管，或者其它适用的开关元件。
第一比较器OP1用于比较第一电压V1和第一参考电压VREF1，输出的比较结果用于控制充电电路2的开关K；在此较佳实施例中，设定为当第一电压V1大于第一参考电压VREF1时，第一比较器OP1控制充电电路2的开关K闭合，电流源对电容C1进行充电；第一参考电压VREF1为开 始侦测输入电压VIN上升速度的起点；
第二比较器OP2用于比较第二电压V2和第四参考电压VREF4，输出第一结果L；
第三比较器OP3用于比较第二电压V2和第三参考电压VREF3，输出第二结果M；
第四比较器OP4用于比较第一电压V1和第二参考电压VREF2，输出第三结果N，第三结果N为逻辑判断器的使能信号；当满足第一电压V1大于第二参考电压VREF2时，第三结果N使能逻辑判断器；第二参考电压VREF2为计算输入电压VIN上升时间的终结点；
其中，第三参考电压VREF3大于第四参考电压VREF4，第二参考电压VREF2大于第一参考电压VREF1，本发明通过设置四个参考电压来侦测输入电压VIN的上升速度；在此实施例中，四个参考电压分别输入相应的比较器的反相输入端。
本发明预先设定电流源及电容C1，充电后电容C1上的第二电压V2与时间相关，通过将第二电压V2分别与预设的第三参考电压VREF3和第四参考电压VREF4比较，预先设定了输入电压VIN的时间上升区间作为比较其上升速度的参照。
本发明首先要对输入电压VIN进行分压，得到一个第一电压V1，此电压首先与第一参考电压VREF1做比较，这个电压点就是开始侦测输入电压VIN上升速度的起点。当第一电压V1开始大于第一参考电压VREF1时，第一比较器OP1可以输出为高电平，控制充电电路2的开关K，给电容C1进行充电。电容C1充电时间及结果由第二比较器OP2与第三比较器OP3决定，第二参考电压VREF2即为计算输入电压VIN上升时间的终结点。
本发明中，输入电压VIN随时间上升，输入电压VIN分压后得到的第一电压V1也随时间上升，通过将第一电压V1分别与预设的第一参考电压VREF1和第二参考电压VREF2比较，预先设定了输入电压VIN的电压上升区间作为比较其上升速度的参照。
逻辑判断器用于接收第一结果L、第二结果M及第三结果N，并根据第三结果N确定是否需要进行逻辑判断，当确定需要进行逻辑判断时，根据预设逻辑、第一结果L和第二结果M判断输入电压上升速度，输出第四结果Q；逻辑判断器具体可以采用逻辑电路，单片机，CPU或FPGA等形式实现。
逻辑判断器根据预设逻辑、第一结果L和第二结果M判断输入电压上升速度，本发明用于判断输入电压上升速度的预设逻辑可以包括：若第二 电压V2小于第四参考电压VREF4且小于第三参考电压VREF3，判断输入电压上升速度过快；若第二电压V2大于第四参考电压VREF4且小于第三参考电压VREF3，判断输入电压上升速度正常；若第二电压V2大于第四参考电压VREF4且大于第三参考电压VREF3，判断输入电压上升速度过慢。
在此较佳实施例中，第一结果L、第二结果M及第三结果N都可以设定为以0或1表示，此时上述预设逻辑具体来说可以包括：第三结果N为逻辑判断器的使能信号，若第三结果N为1，则会读取第一结果L/第二结果M的数值，若第三结果N为0，可以设定为不进行操作；若第一结果L/第二结果M都为0，则证明上升速度太快了，输入电压VIN从第一参考电压VREF1上升到第二参考电压VREF2的时间并不足够；若第一结果L为1，第二结果M为0，这个时候上升速度就是在预设规格内，就可以进行正常开机；若第一结果L/第二结果M同时为1，则证明上升速度太慢，已经超出预设规格，同样可能会引起问题，造成后续异常。
本发明通过此电路即可判断面板驱动的输入电压VIN的上升速度，通过预先设定上升速度的正常范围，可以保证在正常范围的上升速度内正常的工作，若上升速度异常，会判断发生问题，进一步可以设置为不会开机。
参见图2，其为本发明侦测输入电压上升速度的电路一较佳实施例的应用场景方框图。交流直流(ACDC)转换电路10产生输入电压VIN，输至系统级芯片(SOC)20，系统级芯片20再将输入电压VIN输至控制板(CB)30，本发明侦测输入电压上升速度的电路50可以内置于控制板30上的电源管理电路(PMIC)40内，从而可以侦测输入电压VIN上升速度。本发明侦测输入电压上升速度的电路50还可以与系统段相结合，将逻辑判断器输出的第四结果Q反馈给系统级芯片20，并控制交流直流转换电路10产生输入电压VIN的上升速度。
侦测输入电压上升速度的电路50中，逻辑判断器根据预设逻辑判断输入电压VIN上升速度，逻辑判断器输出第四结果Q，并且可以将第四结果Q输入系统级芯片20，由系统级芯片20控制交流直流转换电路10产生输入电压VIN的上升速度和/或由系统级芯片20根据第四结果Q控制开机操作：当输入电压VIN上升速度过快时，系统级芯片20控制交流直流转换电路10减小输入电压VIN上升速度；当输入电压VIN上升速度正常时，系统级芯片20控制正常开机；当输入电压VIN上升速度过慢时，系统级芯片20控制交流直流转换电路10增加输入电压VIN上升速度。
具体做法可以如下，将第四结果Q反馈至系统级芯片20，第四结果Q 形式不再设置为0/1，而是变为电压值，例如，0/1.5/3.3V，若输出为0V，则证明上升速度太快，系统级芯片20控制交流直流转换电路10进行输入电压VIN重启，并减小输入电压VIN上升速度，若第四结果Q电压为3.3V，证明输入电压VIN上升速度太慢，这个时候同样控制交流直流转换电路10增加输入电压VIN上升速度，若第四结果Q反馈电平为1.5V，则判定为正常开机。
另一方面，本发明还提供了侦测输入电压上升速度的方法，其可以基于本发明的侦测输入电压上升速度的电路进行实施，主要包括如下步骤：
分压电路1将输入电压分压以获取第一电压V1；
充电电路2中，由开关控制电流源是否对电容C1充电，电容C1的第一端提供第二电压V2；
第一比较器OP1比较第一电压V1和第一参考电压VREF1，输出的比较结果用于控制充电电路2的开关K；
第二比较器OP2比较第二电压V2和第四参考电压VREF4，输出第一结果L；
第三比较器OP3比较第二电压V2和第三参考电压VREF3，输出第二结果M；
第四比较器OP4比较第一电压V1和第二参考电压VREF2，输出第三结果N，根据第三结果N确定是否进行逻辑判断；当满足第一电压V1大于第二参考电压VREF2时，根据第三结果N确定进行逻辑判断；
逻辑判断器接收第一结果L、第二结果M及第三结果N，并根据第三结果N确定是否需要进行逻辑判断，当确定需要进行逻辑判断时，根据预设逻辑、第一结果L和第二结果M判断输入电压上升速度，输出第四结果Q；
其中，第三参考电压VREF3大于第四参考电压VREF4，第二参考电压VREF2大于第一参考电压VREF1。
逻辑判断器根据第三结果N确定是否需要进行逻辑判断包括：当第一电压V1大于第二参考电压VREF2时，所述逻辑判断器根据该第三结果N确定需要进行逻辑判断。
本发明通过将第二电压V2分别与预设的第三参考电压VREF3和第四参考电压VREF4比较，预先设定了输入电压VIN的时间上升区间作为比较其上升速度的参照。通过将第一电压V1分别与预设的第一参考电压VREF1和第二参考电压VREF2比较，预先设定了输入电压VIN的电压上升区间作为比较其上升速度的参照。
其中，逻辑判断器根据预设逻辑、第一结果L和第二结果M判断输入电压上升速度，输出第四结果Q可以包括：
若第二电压V2小于第四参考电压VREF4且小于第三参考电压VREF3，判断输入电压上升速度过快；若第二电压V2大于第四参考电压VREF4且小于第三参考电压VREF3，判断输入电压上升速度正常；若第二电压V2大于第四参考电压VREF4且第三参考电压VREF3，判断输入电压上升速度过慢。本发明通过设置四个参考电压来侦测输入电压VIN的上升速度。
综上，本发明的侦测输入电压上升速度的电路及方法可以在电源管理电路内部进行输入电压上升速度的侦测，通过采用本发明，若开机输入电压上升速度大于或者小于预设的要求值，就会判定发生异常，并可以反馈出异常，避免在不正常的状态下一直工作。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (15)

  1. 一种侦测输入电压上升速度的电路，包括：
    分压电路，用于将输入电压分压以提供第一电压；
    充电电路，其包括电容、开关及电流源，该电流源连接开关的输入端，该开关的输出端连接电容的第一端，电容的第二端接地，该开关的控制端连接第一比较器的输出端，该电容的第一端提供第二电压；
    第一比较器，用于比较输入的第一电压和第一参考电压，输出的比较结果用于控制所述开关；
    第二比较器，用于比较输入的第二电压和第四参考电压，输出第一结果；
    第三比较器，用于比较输入的第二电压和第三参考电压，输出第二结果；
    第四比较器，用于比较输入的第一电压和第二参考电压，输出第三结果，该第三结果为逻辑判断器的使能信号；当满足第一电压大于第二参考电压时，该第三结果使能逻辑判断器；
    逻辑判断器，用于接收第一结果、第二结果及第三结果，并根据第三结果确定是否需要进行逻辑判断，当确定需要进行逻辑判断时，根据预设逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果；
    其中，第三参考电压大于第四参考电压，第二参考电压大于第一参考电压。
  2. 如权利要求1所述的侦测输入电压上升速度的电路，其中，所述逻辑判断器根据预设逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果包括：
    若第二电压小于第四参考电压且小于第三参考电压，则逻辑判断器判断输入电压上升速度过快；
    若第二电压大于第四参考电压且小于第三参考电压，则逻辑判断器判断输入电压上升速度正常；
    若第二电压大于第四参考电压且大于第三参考电压，则逻辑判断器判断输入电压上升速度过慢。
  3. 如权利要求1所述的侦测输入电压上升速度的电路，其中，所述逻辑判断器将第四结果发送给系统级芯片，供所述系统级芯片根据第四结果控制交流直流转换电路产生输入电压的上升速度。
  4. 如权利要求1所述的侦测输入电压上升速度的电路，其中，当第一电压大于第一参考电压时，第一比较器输出的比较结果控制所述开关闭合。
  5. 如权利要求1所述的侦测输入电压上升速度的电路，其中，所述分压电路包括第一电阻和第二电阻，第一电阻的第一端连接输入电压，第一电阻的第二端和第二电阻的第一端相连接并提供第一电压，第二电阻的第二端接地。
  6. 如权利要求1所述的侦测输入电压上升速度的电路，其中，所述开关为三极管或金属氧化物半导体晶体管。
  7. 如权利要求1所述的侦测输入电压上升速度的电路，其中：
    第一比较器的同相输入端输入第一电压，反相输入端输入第一参考电压；
    第二比较器的同相输入端输入第二电压，反相输入端输入第四参考电压；
    第三比较器的同相输入端输入第二电压，反相输入端输入第三参考电压；
    第四比较器的同相输入端输入第一电压，反相输入端输入第二参考电压。
  8. 一种侦测输入电压上升速度的方法，应用于侦测输入电压上升速度的电路，所述侦测输入电压上升速度的电路，包括：
    分压电路，用于将输入电压分压以提供第一电压；
    充电电路，其包括电容、开关及电流源，该电流源连接开关的输入端，该开关的输出端连接电容的第一端，电容的第二端接地，该开关的控制端连接第一比较器的输出端，该电容的第一端提供第二电压；
    第一比较器，用于比较输入的第一电压和第一参考电压，输出的比较结果用于控制所述开关；
    第二比较器，用于比较输入的第二电压和第四参考电压，输出第一结果；
    第三比较器，用于比较输入的第二电压和第三参考电压，输出第二结果；
    第四比较器，用于比较输入的第一电压和第二参考电压，输出第三结果，该第三结果为逻辑判断器的使能信号；当满足第一电压大于第二参考电压时，该第三结果使能逻辑判断器；
    逻辑判断器，用于接收第一结果、第二结果及第三结果，并根据第三结果确定是否需要进行逻辑判断，当确定需要进行逻辑判断时，根据预设 逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果；
    其中，第三参考电压大于第四参考电压，第二参考电压大于第一参考电压；
    包括：
    分压电路将输入电压分压以提供第一电压；
    充电电路中，由开关控制电流源是否对电容充电，电容的第一端提供第二电压；
    第一比较器比较第一电压和第一参考电压，输出的比较结果用于控制所述开关；
    第二比较器比较第二电压和第四参考电压，输出第一结果；
    第三比较器比较第二电压和第三参考电压，输出第二结果；
    第四比较器比较第一电压和第二参考电压，输出第三结果；
    逻辑判断器接收第一结果、第二结果及第三结果，并根据第三结果确定是否需要进行逻辑判断，当确定需要进行逻辑判断时，根据预设逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果；
    其中，第三参考电压大于第四参考电压，第二参考电压大于第一参考电压。
  9. 如权利要求8所述的侦测输入电压上升速度的方法，其中，所述逻辑判断器根据第三结果确定是否需要进行逻辑判断包括：当第一电压大于第二参考电压时，所述逻辑判断器根据该第三结果确定需要进行逻辑判断。
  10. 如权利要求8所述的侦测输入电压上升速度的方法，其中，所述逻辑判断器根据预设逻辑、第一结果和第二结果判断输入电压上升速度，输出第四结果包括：
    若第二电压小于第四参考电压且小于第三参考电压，判断输入电压上升速度过快；
    若第二电压大于第四参考电压且小于第三参考电压，判断输入电压上升速度正常；
    若第二电压大于第四参考电压且大于第三参考电压，判断输入电压上升速度过慢。
  11. 如权利要求8所述的侦测输入电压上升速度的方法，其中，所述逻辑判断器将第四结果发送给系统级芯片，供所述系统级芯片根据第四结果控制交流直流转换电路产生输入电压的上升速度。
  12. 如权利要求8所述的侦测输入电压上升速度的方法，其中，当第一电压大于第一参考电压时，第一比较器输出的比较结果控制所述开关闭 合。
  13. 如权利要求8所述的侦测输入电压上升速度的方法，其中，所述分压电路包括第一电阻和第二电阻，第一电阻的第一端连接输入电压，第一电阻的第二端和第二电阻的第一端相连接并提供第一电压，第二电阻的第二端接地。
  14. 如权利要求8所述的侦测输入电压上升速度的方法，其中，所述开关为三极管或金属氧化物半导体晶体管。
  15. 如权利要求8所述的侦测输入电压上升速度的方法，其中：
    第一比较器的同相输入端输入第一电压，反相输入端输入第一参考电压；
    第二比较器的同相输入端输入第二电压，反相输入端输入第四参考电压；
    第三比较器的同相输入端输入第二电压，反相输入端输入第三参考电压；
    第四比较器的同相输入端输入第一电压，反相输入端输入第二参考电压。
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Publication number Priority date Publication date Assignee Title
CN110928352B (zh) * 2019-11-21 2021-09-10 思瑞浦微电子科技（苏州）股份有限公司 大电容缓开启电路与方法
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102968236A (zh) * 2012-11-28 2013-03-13 旭曜科技股份有限公司 电容式触控面板的感测电路及其感测方法
CN103567604A (zh) * 2012-07-25 2014-02-12 株式会社大亨 脉冲电弧焊接控制方法
CN106328091A (zh) * 2016-11-04 2017-01-11 深圳市华星光电技术有限公司 液晶显示设备、数据驱动芯片及其驱动能力调节方法
CN106782425A (zh) * 2017-03-30 2017-05-31 深圳市华星光电技术有限公司 输入电压上升时间控制电路

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200811460A (en) * 2006-08-18 2008-03-01 Feature Integration Technology Inc Voltage detecting circuit and method
CN101144837A (zh) * 2006-09-11 2008-03-19 精拓科技股份有限公司 电压检测电路及其方法
JP5434896B2 (ja) * 2010-12-20 2014-03-05 三菱電機株式会社 低電圧保護回路
CN103048600B (zh) * 2012-12-05 2014-12-24 电子科技大学 一种半导体器件反向击穿电压测试系统
JP2015055598A (ja) * 2013-09-13 2015-03-23 アルプス電気株式会社 電圧検出装置
CN104297559A (zh) * 2014-11-07 2015-01-21 杭州凯达电力建设有限公司 一种测量感应电压的装置及方法
CN105652074B (zh) * 2014-12-03 2018-08-10 万国半导体(开曼)股份有限公司 电压检测电路及检测电压变化的方法
CN104483529B (zh) * 2014-12-26 2017-04-12 青岛歌尔声学科技有限公司 一种负电压检测装置及检测方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103567604A (zh) * 2012-07-25 2014-02-12 株式会社大亨 脉冲电弧焊接控制方法
CN102968236A (zh) * 2012-11-28 2013-03-13 旭曜科技股份有限公司 电容式触控面板的感测电路及其感测方法
CN106328091A (zh) * 2016-11-04 2017-01-11 深圳市华星光电技术有限公司 液晶显示设备、数据驱动芯片及其驱动能力调节方法
CN106782425A (zh) * 2017-03-30 2017-05-31 深圳市华星光电技术有限公司 输入电压上升时间控制电路

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