Circuit and method for collecting peak voltage of screen lighting alternating current signal and related device

Abstract

The invention discloses a circuit, a method and a related device for collecting the peak voltage of a point screen alternating current signal, which are used for improving the collection precision of the peak voltage of the alternating current. Acquiring a to-be-acquired signal; following and isolating the signal to be acquired; inputting the following and isolated signal to be collected into a peak voltage storage unit; switching MOS tubes in the positive voltage release MOS tube module and the negative voltage release MOS tube module are controlled to be switched off; the target signal is stored through the first RC circuit and the second RC circuit; leakage current compensation is carried out on the switch MOS tube through the compensation MOS tube; peak voltage collection is carried out through the positive / negative voltage isolation operational amplifier module and the ADC; switching MOS tubes in the positive voltage release MOS tube module and the negative voltage release MOS tube module are controlled to be closed; and after voltage discharge is completed, switching MOS tubes in the positive voltage discharge MOS tube module and the negative voltage discharge MOS tube module are controlled to be switched off, and a new signal to be collected is obtained again.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of point screen peak detection, and in particular, to a circuit, method and related device for collecting the peak voltage of a point screen AC signal. Background Art

[0002] With the continuous development of information display technology, display panel OLED has basically gradually replaced traditional display panel LCD with its advantages of self-luminescence, flexibility, wide viewing angle, fast response speed and simple process, and has been rapidly and deeply applied to various fields of modern society.

[0003] However, as the market's requirements for the display quality of OLED display panels become higher and higher, the requirements for appearance design are becoming more and more diverse, and the shipment volume and appearance design requirements of electronic products such as mobile phones, tablets and computers are also getting higher and higher, such as: notch screens, water drop screens, curved screens, etc. However, due to the limitations of the process level of OLED display panels and objective environmental factors, OLED display panels will have a variety of mura defects. Therefore, during the production process of display screens, it is necessary to perform lighting and aging tests on the screen cells to ensure production quality.

[0004] The lighting of the cell requires a dedicated signal generator to generate a dedicated waveform to drive the relevant pins. The signals supplied to the screen by the existing equipment include AC signals and DC signals. The DC signal can be acquired through a low-speed ADC to obtain the voltage value of the power supply. Due to the level conversion of the AC signal, the highest flip frequency currently used by the dot screen reaches 1.25MHZ, which is difficult to collect using a low-speed ADC, which will increase the complexity of the acquisition circuit. In order to accurately obtain the peak voltage of the high-speed flipped AC signal, the existing technology usually uses an ADC with a conversion rate of 10 times the AC flip frequency to collect the peak voltage (positive peak voltage and negative peak voltage). This will cause many problems. The high-speed conversion ADC is expensive. For acquisition equipment with fewer screen signal channels, a high-speed conversion ADC can be added for each screen signal. However, large-scale acquisition equipment is usually equipped with up to 160 screen signals. If all high-speed conversion ADCs are used, the cost will be greatly increased. In the prior art, the screen signals of most channels in large-scale acquisition equipment can only be collected using relatively low-cost ADCs, which makes the acquisition circuit structure complex and leads to leakage current, which reduces the acquisition accuracy of the AC peak voltage during the lighting and aging tests of the screen cells. Summary of the invention

[0005] The present application discloses a circuit, method and related device for collecting the peak voltage of a point-screen AC signal, which are used to improve the collection accuracy of the AC peak voltage.

[0006] The first aspect of the present application provides a peak voltage acquisition circuit for a point-to-screen AC signal, comprising: Multiplexer, voltage follower isolation amplifier, peak voltage storage unit, positive / negative voltage isolation amplifier module and ADC; The peak voltage storage unit includes a positive voltage peak gating module U2, a negative voltage peak gating module U1, a first RC circuit, a second RC circuit, a positive voltage discharge MOS tube module, a negative voltage discharge MOS tube module, a first switch module, a second switch module and a plurality of resistors. A gating diode for gating electrical signals is provided in the positive voltage peak gating module U2 and the negative voltage peak gating module U1. The positive voltage discharge MOS tube module and the negative voltage discharge MOS tube module both include a switch MOS tube for controlling discharge and a compensation MOS tube for supplementing leakage current of the switch MOS tube. The multiplexer is connected to the voltage follower isolation amplifier, the multiplexer is used to collect multiple signals to be tested, and the voltage follower isolation amplifier is used to prevent the collection circuit from interfering with the output signal; The voltage follower isolation amplifier is connected to the positive voltage peak gating module U2 and the negative voltage peak gating module U1 respectively; The positive pressure peak gating module U2 and the negative pressure peak gating module U1 are connected to the first RC circuit and the second RC circuit respectively; The first RC circuit and the second RC circuit are respectively connected to the input end of the positive isolation amplifier and the input end of the negative isolation amplifier on the positive / negative voltage isolation amplifier module; The positive pressure relief MOS tube module is connected to the input end of the positive isolation operational amplifier, and the first switch module is connected to the switch MOS tube of the positive pressure relief MOS tube module; The negative pressure relief MOS tube module is connected to the input end of the negative isolation operational amplifier, and the second switch module is connected to the switch MOS tube of the negative pressure relief MOS tube module; The output end of the positive / negative voltage isolation amplifier module is connected to the ADC.

[0007] Optionally, the positive pressure discharge MOS tube module includes a switch MOS tube Q1 and a compensation MOS tube Q5, and the negative pressure discharge MOS tube module includes a switch MOS tube Q2 and a compensation MOS tube Q6; The D1 pole of the switch MOS tube Q1 is connected to the input end of the positive isolation amplifier through the resistor R2, and the input end of the positive isolation amplifier is connected to the G2 pole and the S2 pole of the compensation MOS tube Q5 through the resistor R3; the S1 pole of the switch MOS tube Q1 is connected to the external voltage, and the G1 pole of the switch MOS tube Q1 is connected to the first switch module, and the first switch module is used to control the closing and opening of the switch MOS tube Q1; the D2 pole of the supplementary MOS tube Q5 is connected to the external voltage; The D1 pole of the switch MOS tube Q2 is connected to the input end of the negative isolation amplifier through the resistor R9, and the input end of the negative isolation amplifier is connected to the G2 pole and the S2 pole of the compensation MOS tube Q6 through the resistor R10; the S1 pole of the switch MOS tube Q2 is connected to the external voltage, and the G1 pole of the switch MOS tube Q1 is connected to the second switch module, and the second switch module is used to control the closing and opening of the switch MOS tube Q2; the D2 pole of the supplementary MOS tube Q6 is connected to the external voltage.

[0008] The voltage follower isolation amplifier is connected to the K1 interface of the negative voltage peak gating module U1, and the negative voltage peak gating module U1 is used to gate the negative voltage; The A1 interface of the negative pressure peak gating module U1 is connected to the second RC circuit, and the second RC circuit is used to store the connected peak voltage signal; The second RC circuit is connected to the D1 pole of the switch MOS tube Q2 through the resistor R9, the second RC circuit is connected to the G2 pole and the S2 pole of the compensation MOS tube Q6 through the resistor R10, and the second RC circuit is connected to the positive input port of the negative voltage isolation amplifier; The voltage follower isolation amplifier is also connected to the A1 interface of the positive voltage peak gating module U2, and the positive voltage peak gating module U2 is used to gating the forward voltage; The K1 interface of the positive voltage peak gating module U2 is connected to the first RC circuit, and the first RC circuit is used to store the connected peak voltage signal; The first RC circuit is connected to the D1 pole of the switch MOS tube Q2 through the resistor R2, the first RC circuit is connected to the G2 pole and the S2 pole of the compensation MOS tube Q5 through the resistor R3, and the first RC circuit is connected to the positive input port of the positive voltage isolation amplifier; The negative input port and output port of the positive voltage isolation amplifier are connected to the ADC; The negative input port and the output port of the negative voltage isolation operational amplifier are connected to the ADC.

[0009] Optionally, both the positive pressure peak gating module U2 and the negative pressure peak gating module U1 are provided with a gating diode and a compensation diode; The positive electrode and the negative electrode of the first gate diode are respectively connected to the A1 terminal and the K1 terminal of the positive voltage peak gate module U2; The anode of the first compensation diode is connected to the A3 terminal in the positive voltage peak gating module U2, and the cathode of the first compensation diode is connected to the external power supply; The first gating diode and the first compensation diode are in opposite directions; The A3 terminal in the positive voltage peak gating module U2 is connected to the resistor R4 and then connected to the input terminal of the positive isolation amplifier; The anode and cathode of the second gate diode are respectively connected to the K1 terminal and the A1 terminal of the negative voltage peak gate module U1; The anode of the second compensation diode is connected to the A3 terminal in the positive voltage peak gating module U1, and the cathode of the second compensation diode is connected to the external power supply; The second gate diode and the second compensation diode are in opposite directions; The K3 terminal in the negative voltage peak gating module U1 is connected to the resistor R11 and then connected to the input terminal of the negative isolation amplifier.

[0010] Optionally, the first switch module includes a transistor Q3, a resistor R5, a resistor R6 and a resistor R7; The G1 electrode of the switch MOS tube Q1 is connected to the collector electrode of the transistor Q3 through the resistor R7; The external voltage is connected to the collector of transistor Q3 through resistor R6; The first IO port is connected to the emitter of the transistor Q3 through the resistor R5; The base of transistor Q3 is grounded; The second switch module includes a transistor Q4, a resistor R12, a resistor R13 and a resistor R14; The G1 electrode of the switch MOS tube Q2 is connected to the collector of the transistor Q4 through the resistor R13; The external voltage is connected to the collector of transistor Q4 through resistor R12; The second IO port is connected to the emitter of transistor Q4 through resistor R14; The base of transistor Q4 is connected to the external voltage.

[0011] A second aspect of the present application provides a method for using the acquisition circuit according to the first aspect, comprising: The signal to be collected is obtained through a multiplexer, and the signal to be collected is a point-screen AC signal; The signal to be collected is followed and isolated by a voltage follower isolation amplifier to prevent the entire collection circuit from interfering with the signal to be collected; Inputting the signal to be collected after following and isolating into the peak voltage storage unit; The switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module are controlled to be disconnected by the first switch module and the second switch module, so that the gate diode gates the target signal in the signal to be collected, and the target signal is a positive pressure signal or a negative pressure signal; Storing the target signal through the first RC circuit and the second RC circuit; The leakage current of the switch MOS tube is compensated by the compensation MOS tube; Peak voltage is collected through positive / negative voltage isolation amplifier module and ADC; The switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module are controlled to be closed by the first switch module and the second switch module, so that the charging and discharging ends of the storage capacitors in the first RC circuit and the second RC circuit are grounded after passing through the switch MOS tubes, and enter the voltage discharge process; When the voltage discharge is completed, the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module are controlled to be disconnected through the first switch module and the second switch module, and a new signal to be collected is obtained again.

[0012] Optionally, after storing the target signal through the RC circuit and before collecting the peak voltage through the positive / negative voltage isolation amplifier module and the ADC, the method further includes: The leakage current of the gate diode is compensated by the compensation diode.

[0013] Optionally, before acquiring the signal to be collected through the multiplexer, the method further includes: Isolating the gate diode on the peak voltage storage unit and connecting the gate diode to the first detection circuit; In the first detection circuit, a detection voltage signal is input to the positive electrode of the gate diode, and the reverse current and diode temperature of the gate diode are detected in real time to obtain first detection data, where the first detection data is a fitting curve of the operating temperature and reverse current of the gate diode, and the detection voltage signal is of the same type as the signal to be collected; Isolating the compensation diode on the peak voltage storage unit and connecting it to the second detection circuit; In the second detection circuit, a detection voltage signal is input to the cathode of the compensation diode, and the reverse current and the diode temperature of the compensation diode are detected in real time to obtain second detection data, which is a fitting curve of the operating temperature and reverse current of the compensation diode.

[0014] Optionally, after controlling the output of the third external voltage interface so that the compensation diode compensates the leakage current of the gate diode, and before collecting the peak voltage through the positive and negative voltage isolation amplifier and the ADC, the collection method further includes: Real-time detection of a first temperature of the gate diode and a second temperature of the compensation diode; Determine a real-time reverse current value by using the first temperature and the first detection data; Determine a real-time compensation current value according to the second temperature and the second detection data; When the real-time reverse current value and the real-time compensation current value do not meet the preset conditions, the temperatures of the gate diode and the compensation diode are adjusted, and re-measured until the difference between the real-time reverse current value and the real-time compensation current value meets the preset conditions.

[0015] The third aspect of the present application provides a device using the acquisition circuit of the first aspect, comprising: An acquisition unit, used for acquiring a signal to be acquired through a multiplexer, wherein the signal to be acquired is a point-to-screen AC signal; An isolation unit is used to follow and isolate the signal to be collected through a voltage follower isolation amplifier to prevent the entire collection circuit from interfering with the signal to be collected; An input unit, used for inputting the signal to be collected after following and isolating into a peak voltage storage unit; A first control unit is used to control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to be disconnected through the first switch module and the second switch module, so that the gate diode gates the target signal in the signal to be collected, and the target signal is a positive pressure signal or a negative pressure signal; A storage unit, used for storing the target signal through the first RC circuit and the second RC circuit; A first compensation unit, used for compensating the leakage current of the switch MOS tube through the compensation MOS tube; A collection unit, used for collecting peak voltage through a positive / negative voltage isolation amplifier module and an ADC; A second control unit is used to control the closure of the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module through the first switch module and the second switch module, so that the charging and discharging ends of the storage capacitors in the first RC circuit and the second RC circuit are grounded after passing through the switch MOS tubes, and enter the voltage discharge process; The third control unit is used to control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to disconnect through the first switch module and the second switch module after the voltage discharge is completed, and re-acquire a new signal to be collected.

[0016] Optionally, after the storage unit and before the collection unit, the device further includes: The second compensation unit is used to compensate the leakage current of the gate diode through the compensation diode.

[0017] Optionally, before the acquiring unit, the device further includes: A first isolation unit, used for isolating a gate diode on the peak voltage storage unit and connecting the gate diode to a first detection circuit; a second input unit, used to input a detection voltage signal to the positive electrode of the gate diode in the first detection circuit, detect the reverse current and diode temperature of the gate diode in real time, and obtain first detection data, the first detection data being a fitting curve of the operating temperature and reverse current of the gate diode, and the detection voltage signal is of the same type as the signal to be collected; A second isolation unit, used for isolating the compensation diode on the peak voltage storage unit and connecting to the second detection circuit; The third input unit is used to input a detection voltage signal to the cathode of the compensation diode in the second detection circuit, detect the reverse current and the diode temperature of the compensation diode in real time, and obtain second detection data, which is a fitting curve of the operating temperature and reverse current of the compensation diode.

[0018] Optionally, after the second compensation unit and before the collection unit, the collection device further includes: A detection unit, used for detecting a first temperature of the gate diode and a second temperature of the compensation diode in real time; A first determining unit, configured to determine a real-time reverse current value according to a first temperature and first detection data; A second determining unit, used to determine a real-time compensation current value according to a second temperature and a second detection data; The regulating unit is used to adjust the temperature of the gate diode and the compensation diode when the real-time reverse current value and the real-time compensation current value do not meet the preset conditions, and re-measure until the difference between the real-time reverse current value and the real-time compensation current value meets the preset conditions.

[0019] A fourth aspect of the present application provides a device using the acquisition circuit according to the first aspect, comprising: Processor, memory, input-output unit, and bus; The processor is connected to the memory, the input and output unit, and the bus; The memory stores a program, and the processor calls the program to execute the first aspect and any optional method of the first aspect.

[0020] A fourth aspect of the present application provides a computer-readable storage medium, on which a program is stored. When the program is executed on a computer, the program executes the first aspect and any optional method of the first aspect.

[0021] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages: In the present application, a signal to be collected is first connected, and the signal to be collected is a dot screen AC signal. The signal to be collected is followed and isolated by a voltage follower isolation amplifier to prevent the entire acquisition circuit from interfering with the signal to be collected. Next, the signal to be collected after following and isolation is input into a peak voltage storage unit. Among them, the peak voltage storage unit includes a gating diode for selecting positive voltage or negative voltage selection, an RC holding circuit for storing signals, and a pair of MOS tubes used as a switch discharge circuit, and an IO port and a triode for controlling the MOS tube. A pair of MOS tubes used as a switch discharge circuit includes a switch MOS tube and a compensation MOS tube. Among them, the positive pole of the gating diode is connected to the output end of the voltage follower isolation amplifier, that is, the signal to be collected will first enter the gating diode. The negative pole of the gating diode is connected to the charge and discharge end of the storage capacitor in the RC holding circuit. The gate diode is provided with an access voltage for positive and negative voltage gating, the D pole of the switch MOS tube is respectively connected to the charge and discharge end and the input end of the positive and negative voltage isolation amplifier, the first external voltage interface is respectively connected to the S pole and G pole of the switch MOS tube, the C pole of the triode is connected to the IO port, the B pole of the triode is grounded, the E pole of the triode is connected to the G pole of the switch MOS tube, the S pole and the G pole of the compensation MOS tube are connected to the charge and discharge end, and the D pole of the compensation MOS tube is connected to the second external voltage interface. The switch MOS tube is disconnected by controlling the IO port so that the gate diode gates the target signal in the signal to be collected, and the target signal is a positive voltage signal or a negative voltage signal. The target signal is stored by the RC holding circuit. The output of the second external voltage interface is controlled so that the compensation MOS tube compensates for the leakage current of the switch MOS tube. The peak voltage is collected by the positive and negative voltage isolation amplifier and the ADC.

[0022] When it is necessary to collect the peak voltage signal, the switch MOS tube is disconnected through the IO port and the transistor control, and the unidirectional conduction effect of the gate diode is utilized, and the access voltage set on the gate diode is matched, so that the peak voltage storage unit can select the positive peak voltage access or the negative peak voltage access. Next, the peak voltage is stored through the RC holding circuit. Since the D pole of the switch MOS tube is connected to the charging and discharging end of the storage capacitor of the RC holding circuit, a leakage current from the D pole to the S pole is generated, so the output of the second external voltage interface is controlled to be set to the upper limit of the voltage to be collected, so that the S pole of the compensation MOS tube is compensated to the charging and discharging end, and finally the peak voltage is collected through the positive and negative voltage isolation amplifier and ADC. In this scheme, the circuit structure is simple, and the leakage current of the switch MOS tube is compensated by the compensation MOS tube and the second external voltage, so that the acquisition accuracy of the AC peak voltage is greatly improved during the lighting and aging test of the screen cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of an embodiment of a method for collecting the peak voltage of a point-to-screen AC signal of the present application; Figure 2 A schematic diagram of an embodiment of the leakage current compensation method of the present application; Figure 3 A schematic diagram of an embodiment of a method for generating a fitting curve of operating temperature and reverse current for the present application; Figure 4 A schematic diagram of an embodiment of a method for adjusting the temperature of a gate diode and a compensation diode according to the present application; Figure 5 A schematic diagram of an embodiment of a device using a collection circuit for the present application; Figure 6 A schematic diagram of an embodiment of a device using a collection circuit for the present application; Figure 7 This is a structural schematic diagram of a circuit for collecting the peak voltage of a point-to-screen AC signal in this application. DETAILED DESCRIPTION

[0025] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0026] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0027] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0029] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0030] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0031] In the prior art, in order to accurately obtain the peak voltage of the high-speed flipping AC signal, the prior art usually uses an ADC with a conversion rate of 10 times the AC flipping frequency to collect the peak voltage (positive peak voltage and negative peak voltage). This will cause many problems. The high-speed conversion ADC is expensive. For acquisition equipment with fewer screen signal channels, a high-speed conversion ADC can be added for each screen signal. However, large-scale acquisition equipment is usually equipped with up to 160 screen signals. If high-speed conversion ADCs are used for all of them, the cost will be greatly increased. In the prior art, the screen signals of most channels in large-scale acquisition equipment can only be collected using relatively low-cost ADCs, which will make the acquisition circuit structure complicated, and leakage current will occur, which will lead to a decrease in the acquisition accuracy of the AC peak voltage during the lighting and aging tests of the screen cells.

[0032] Based on this, the present application discloses a circuit, method and related device for collecting the peak voltage of a point-screen AC signal, which are used to improve the collection accuracy of the AC peak voltage.

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] The method of the present application can be applied to a server, a device, a terminal or other devices with logic processing capabilities, and the present application does not limit this. For the convenience of description, the following description is made by taking the execution subject as an example of a terminal.

[0035] See also Figure 7 The present application provides a circuit for collecting the peak voltage of a point-screen AC signal, comprising: Multiplexer selector TMUX, voltage follower isolation amplifier, peak voltage storage unit, positive / negative voltage isolation amplifier module and ADC; The peak voltage storage unit includes a positive voltage peak gating module U2, a negative voltage peak gating module U1, a first RC circuit, a second RC circuit, a positive voltage discharge MOS tube module, a negative voltage discharge MOS tube module, a first switch module, a second switch module and a plurality of resistors. A gating diode for gating electrical signals is provided in the positive voltage peak gating module U2 and the negative voltage peak gating module U1. The positive voltage discharge MOS tube module and the negative voltage discharge MOS tube module both include a switch MOS tube for controlling discharge and a compensation MOS tube for supplementing leakage current of the switch MOS tube. The multiplexer is connected to the voltage follower isolation amplifier, the multiplexer is used to collect multiple signals to be tested, and the voltage follower isolation amplifier is used to prevent the collection circuit from interfering with the output signal; The voltage follower isolation amplifier is connected to the positive voltage peak gating module U2 and the negative voltage peak gating module U1 respectively; The positive pressure peak gating module U2 and the negative pressure peak gating module U1 are connected to the first RC circuit and the second RC circuit respectively; The first RC circuit and the second RC circuit are respectively connected to the input end of the positive isolation amplifier and the input end of the negative isolation amplifier on the positive / negative voltage isolation amplifier module; The positive pressure relief MOS tube module is connected to the input end of the positive isolation operational amplifier, and the first switch module is connected to the switch MOS tube of the positive pressure relief MOS tube module; The negative pressure relief MOS tube module is connected to the input end of the negative isolation operational amplifier, and the second switch module is connected to the switch MOS tube of the negative pressure relief MOS tube module; The output end of the positive / negative voltage isolation amplifier module is connected to the ADC.

[0036] Specifically, a pair of MOS tubes (positive voltage discharge MOS tube module or negative voltage discharge MOS tube module) used as a switch discharge circuit includes a switch MOS tube and a compensation MOS tube. The positive electrode of the gate diode is connected to the output end of the voltage follower isolation amplifier. The multiplexer selector is used to collect multiple signals to be tested. After the multiplexer selector selects the corresponding signal, it is input into the voltage follower isolation amplifier. The voltage follower isolation amplifier is used to avoid the collection circuit from interfering with the output signal. The positive voltage peak gate module U2 and the negative voltage peak gate module U1 are used to select the positive voltage signal and the negative voltage signal respectively.

[0037] The first RC circuit and the second RC circuit are used to store the positive pressure signal and the negative pressure signal filtered by the positive pressure peak gating module U2 and the negative pressure peak gating module U1.

[0038] Since the first switch module is connected to the switch MOS tube of the positive pressure discharge MOS tube module, and the second switch module is connected to the switch MOS tube of the negative pressure discharge MOS tube module, the switch of the switch MOS tube is controlled by the first switch module and the second switch module, so that the voltage stored in the first RC circuit and the second RC circuit can be collected by the ADC after passing through the positive / negative voltage isolation amplifier module, and discharged after the collection is completed.

[0039] The compensation MOS tube is connected to the positive / negative voltage isolation amplifier module in a completely opposite way (completely opposite to the switching MOS tube), and the leakage of the switching MOS tube is compensated by connecting to a preset external voltage.

[0040] In this embodiment, the first RC circuit includes a resistor R1 and a capacitor C1, and the second RC circuit includes a resistor R8 and a capacitor C2, and the connection method is as follows: Figure 7 .

[0041] In this embodiment, the voltage follower isolation amplifier includes voltage follower isolation amplifiers U2B, U1B and U2A, which are connected as follows: Figure 7 .

[0042] Optionally, the positive pressure discharge MOS tube module includes a switch MOS tube Q1 and a compensation MOS tube Q5, and the negative pressure discharge MOS tube module includes a switch MOS tube Q2 and a compensation MOS tube Q6; The D1 pole of the switch MOS tube Q1 is connected to the input end of the positive isolation amplifier through the resistor R2, and the input end of the positive isolation amplifier is connected to the G2 pole and the S2 pole of the compensation MOS tube Q5 through the resistor R3; the S1 pole of the switch MOS tube Q1 is connected to the external voltage, and the G1 pole of the switch MOS tube Q1 is connected to the first switch module, and the first switch module is used to control the closing and opening of the switch MOS tube Q1; the D2 pole of the supplementary MOS tube Q5 is connected to the external voltage; The D1 pole of the switch MOS tube Q2 is connected to the input end of the negative isolation amplifier through the resistor R9, and the input end of the negative isolation amplifier is connected to the G2 pole and the S2 pole of the compensation MOS tube Q6 through the resistor R10; the S1 pole of the switch MOS tube Q2 is connected to the external voltage, and the G1 pole of the switch MOS tube Q1 is connected to the second switch module, and the second switch module is used to control the closing and opening of the switch MOS tube Q2; the D2 pole of the supplementary MOS tube Q6 is connected to the external voltage.

[0043] The voltage follower isolation amplifier is connected to the K1 interface of the negative voltage peak gating module U1, and the negative voltage peak gating module U1 is used to gate the negative voltage; The A1 interface of the negative pressure peak gating module U1 is connected to the second RC circuit, and the second RC circuit is used to store the connected peak voltage signal; The second RC circuit is connected to the D1 pole of the switch MOS tube Q2 through the resistor R9, the second RC circuit is connected to the G2 pole and the S2 pole of the compensation MOS tube Q6 through the resistor R10, and the second RC circuit is connected to the positive input port of the negative voltage isolation amplifier; The voltage follower isolation amplifier is also connected to the A1 interface of the positive voltage peak gating module U2, and the positive voltage peak gating module U2 is used to gating the forward voltage; The K1 interface of the negative pressure peak gating module U2 is connected to the first RC circuit, and the first RC circuit is used to store the connected peak voltage signal; The first RC circuit is connected to the D1 pole of the switch MOS tube Q2 through the resistor R2, the first RC circuit is connected to the G2 pole and the S2 pole of the compensation MOS tube Q5 through the resistor R3, and the first RC circuit is connected to the positive input port of the positive voltage isolation amplifier; The negative input port and output port of the positive voltage isolation amplifier are connected to the ADC; The negative input port and the output port of the negative voltage isolation operational amplifier are connected to the ADC.

[0044] Specifically, in this embodiment, the D1 pole of the switch MOS tube Q1 is connected to the first RC circuit and the input end of the positive isolation amplifier respectively, and the input end of the positive isolation amplifier is connected to the G2 pole and S2 pole of the compensation MOS tube Q5 through the resistor R3. The S1 pole of the switch MOS tube Q1 is connected to the external voltage (-6V), and the G1 pole of the switch MOS tube Q1 is connected to the first switch module, and the first switch module is used to control the closing and opening of the switch MOS tube Q1. The D2 pole of the supplementary MOS tube Q5 is connected to the external voltage (+10V).

[0045] Specifically, in this embodiment, the D1 pole of the switch MOS tube Q2 is respectively connected to the 34th RC circuit and the input end of the negative isolation amplifier, and the input end of the negative isolation amplifier is connected to the G2 pole and S2 pole of the compensation MOS tube Q5 through the resistor R3. The S1 pole of the switch MOS tube Q1 is connected to the external voltage (-6V), and the G1 pole of the switch MOS tube Q1 is connected to the first switch module, and the first switch module is used to control the closing and opening of the switch MOS tube Q1. The D2 pole of the supplementary MOS tube Q5 is connected to the external voltage (+10V).

[0046] In this embodiment, U1B of the voltage follower isolation amplifier is connected to the A1 interface of the positive voltage peak gating module U2, and the positive voltage peak gating module U2 is used to gate the forward voltage. The K1 interface of the positive voltage peak gating module U2 is connected to the first RC circuit, and the first RC circuit is used to store the connected peak voltage signal. The first RC circuit is connected to the D1 pole of the switch MOS tube Q2 through the resistor R2, the first RC circuit is connected to the G2 pole and S2 pole of the compensation MOS tube Q5 through the resistor R3, and the first RC circuit is connected to the positive input port of the positive voltage isolation amplifier. The negative input port and output port of the positive voltage isolation amplifier are connected to the ADC. The positive voltage peak gating module U2 includes A1, A2 and A3, as well as K1, K2 and K3, a total of 6 interfaces. Among them, A2 and K2 are not connected to any components.

[0047] In this embodiment, U2A of the voltage follower isolation amplifier is connected to the K1 interface of the negative voltage peak gating module U1, and the negative voltage peak gating module U1 is used to gate the negative voltage. The A1 interface of the negative voltage peak gating module U1 is connected to the second RC circuit, and the second RC circuit is used to store the connected peak voltage signal. The second RC circuit is connected to the D1 pole of the switch MOS tube Q2 through the resistor R9, and the second RC circuit is connected to the G2 pole and S2 pole of the compensation MOS tube Q6 through the resistor R10. The second RC circuit is connected to the positive input port of the negative voltage isolation amplifier. The negative input port and output port of the negative voltage isolation amplifier are connected to the ADC. The negative voltage peak gating module U1 includes A1, A2 and A3, and K1, K2 and K3, a total of 6 interfaces. Among them, A2 and K2 are not connected to any components.

[0048] Optionally, both the positive pressure peak gating module U2 and the negative pressure peak gating module U1 are provided with a gating diode and a compensation diode; The positive electrode and the negative electrode of the first gate diode are respectively connected to the A1 terminal and the K1 terminal of the positive voltage peak gate module U2; The anode of the first compensation diode is connected to the A3 terminal in the positive voltage peak gating module U2, and the cathode of the first compensation diode is connected to the external power supply (connected to the external power supply on K3); The first gating diode and the first compensation diode are in opposite directions; The A3 terminal (A-CH01) in the positive voltage peak gating module U2 is connected to the resistor R4 and then connected to the (positive) input terminal of the positive isolation amplifier; The anode and cathode of the second gate diode are respectively connected to the K1 terminal and the A1 terminal of the negative voltage peak gate module U1; The anode of the second compensation diode is connected to the A3 terminal in the positive voltage peak gating module U1, and the cathode of the second compensation diode is connected to the external power supply (connected to the external power supply on A3); The second gate diode and the second compensation diode are in opposite directions; The K3 terminal (B-CH02) in the negative voltage peak gating module U1 is connected to the resistor R11 and then connected to the (positive) input terminal of the negative isolation amplifier.

[0049] In this embodiment, the cathode of the selection diode is connected to the charging and discharging end of the storage capacitor in the RC circuit (RC holding circuit), and an access voltage for positive and negative voltage selection is provided on the selection diode. By controlling the access voltage, the signal entering from the selection diode will enter the RC circuit.

[0050] Optionally, the first switch module includes a transistor Q3, a resistor R5, a resistor R6 and a resistor R7; The G1 electrode of the switch MOS tube Q1 is connected to the collector electrode of the transistor Q3 through the resistor R7; The external voltage (-6V) is connected to the collector of transistor Q3 through resistor R6; The first IO port (Ctrl-CH01) is connected to the emitter of transistor Q3 through resistor R5; The base of transistor Q3 is grounded; The second switch module includes a transistor Q4, a resistor R12, a resistor R13 and a resistor R14; The G1 electrode of the switch MOS tube Q2 is connected to the collector of the transistor Q4 through the resistor R13; The external voltage (+6V) is connected to the collector of transistor Q4 through resistor R12; The second IO port (Ctrl-CH02) is connected to the emitter of transistor Q4 through resistor R14; The base of transistor Q4 is connected to the external voltage (VDD-3.3V).

[0051] See also Figure 1 The present application provides an embodiment of a method for collecting a peak voltage of a point-to-screen AC signal, comprising: 101. Obtain a signal to be collected through a multiplexer, where the signal to be collected is a point-screen AC signal; In this embodiment, the terminal first needs to obtain a screen signal (signal to be collected).

[0052] In this embodiment, by using multiple multiplexer selectors, the signal to be collected is connected to the operational amplifier follower circuit (voltage follower isolation operational amplifier) ​​below. The multiplexer selector can be used to collect multiple signals to be tested by one ADC in time-division multiplexing. This solves the problem of needing to equip each signal with an ADC, reducing costs.

[0053] 102. Follow and isolate the signal to be collected by a voltage follower isolation amplifier to prevent the entire collection circuit from interfering with the signal to be collected; After the terminal obtains the signal to be collected, it is connected to a voltage follower isolation amplifier, and the voltage follower isolation amplifier is used to follow and isolate the signal to be collected to prevent the entire collection circuit from interfering with the signal to be collected.

[0054] 103. Input the signal to be collected after following and isolating into a peak voltage storage unit; The terminal inputs the signal to be collected after isolation into the peak voltage storage unit, specifically, it is first connected to the selection module, then connected to the RC circuit, and then input into the ADC through the discharge MOS tube. For details, see the implementation of the above-mentioned collection circuit operation analysis.

[0055] Specifically, a pair of MOS tubes used as a switch discharge circuit includes a switch MOS tube and a compensation MOS tube. The positive electrode of the gate diode is connected to the output end of the voltage follower isolation amplifier. The negative electrode of the gate diode is connected to the charge and discharge end of the storage capacitor in the RC circuit. The gate diode is provided with an access voltage for positive and negative voltage gating. By controlling the access voltage, the signal entering from the gate diode will enter the RC circuit.

[0056] The D pole of the switch MOS tube is respectively connected to the charge and discharge end and the input end of the positive and negative voltage isolation amplifier, the first external voltage interface is respectively connected to the S pole and G pole of the switch MOS tube, the C pole of the triode is connected to the IO port, the B pole of the triode is grounded, the E pole of the triode is connected to the G pole of the switch MOS tube, the S pole and the G pole of the compensation MOS tube are connected to the charge and discharge end, and the D pole of the compensation MOS tube is connected to the second external voltage interface. The IO port and the triode can control the closing and disconnection of the switch MOS tube. When the acquisition is in progress, the IO port and the triode control the switch MOS tube to disconnect. After the acquisition is completed, the IO port and the triode can control the closing and closing of the switch MOS tube, so that the RC holding circuit enters the discharge. When the discharge is completed, a new round of signal detection can be re-entered.

[0057] 104. Control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to be disconnected through the first switch module and the second switch module, so that the gate diode gates the target signal in the signal to be collected, and the target signal is a positive pressure signal or a negative pressure signal; The terminal controls the MOS switch through the IO port to be disconnected, so that the gate diode gates the target signal in the signal to be collected, and the target signal is a positive pressure signal or a negative pressure signal.

[0058] Specifically, in this embodiment, the terminal uses the unidirectional conduction effect of the diode to connect a voltage lower than 0V to the cathode of the gate diode and the RC holding circuit. At this time, the forward voltage enters the gate diode, and the positive voltage peak voltage can be selected for access to collect the positive voltage peak. A voltage greater than 0V can be connected to the anode of the gate diode, and the negative voltage peak can be selected for access to collect the negative voltage peak.

[0059] 105. Storing the target signal through the first RC circuit and the second RC circuit; After the terminal introduces a positive voltage model or a negative voltage signal, the target signal is stored through an RC holding circuit. The RC holding circuit includes a resistor and a capacitor for storing the signal.

[0060] One end of the resistor is connected to the cathode of the gate diode, and the other end is connected to the charging and discharging end of the capacitor, so that the charging and discharging end of the capacitor can store the signal.

[0061] 106. Compensating the leakage current of the switch MOS tube by using the compensation MOS tube; The terminal controls the output of the second external voltage interface so that the compensation MOS tube compensates for the leakage current of the switch MOS tube. Specifically, the D pole access point of the switch MOS tube is the RC holding circuit, and the S pole is lower than the minimum voltage value of the signal to be sampled. During the charging process of the RC holding circuit, the switch MOS tube is controlled to remain in a closed state. Since there is a leakage current from the D pole to the S pole of the MOS tube, in this circuit, a compensation MOS tube of the same model will be used to connect the S pole to the RC holding circuit, and the D pole of the compensation MOS tube is a voltage value greater than the maximum sampled signal, so as to compensate for the leakage current of the switch of the switch MOS tube.

[0062] 107. Collect the peak voltage through the positive / negative voltage isolation amplifier module and ADC; In this embodiment, since the REF voltage used by the acquisition ADC is 4.096V and the maximum value of the signal to be collected is ±30V, it is necessary to reduce the voltage through an operational amplifier circuit (positive and negative voltage isolation amplifier) ​​before collecting. If it is a positive peak voltage, the positive peak voltage is reduced to 2-4V. If it is a negative peak voltage, the negative peak voltage is reversed and reduced to 0-2V.

[0063] 108. Control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to be closed through the first switch module and the second switch module, so that the charging and discharging ends of the storage capacitors in the first RC circuit and the second RC circuit are grounded after passing through the switch MOS tubes, and enter the voltage discharge process; 109. When the voltage discharge is completed, the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module are controlled to be disconnected through the first switch module and the second switch module, and a new signal to be collected is obtained again.

[0064] When we select the signal to be collected to connect to this circuit, we can store the peak voltage in the RC holding circuit. When the ADC collection is completed and the next signal to be collected is switched, the access signal is first turned off, and then the discharge circuit (switch MOS tube) is opened through the IO port to discharge the voltage in the RC holding circuit to the ground terminal, wait for the discharge to be completed, and then select the next signal to be collected to connect.

[0065] In this application, a signal to be collected is first connected, and the signal to be collected is a dot screen AC signal. The signal to be collected is followed and isolated by a voltage follower isolation amplifier to prevent the entire collection circuit from interfering with the signal to be collected. Next, the signal to be collected after following and isolating is input into the peak voltage storage unit.

[0066] The peak voltage storage unit includes a gate diode for selecting positive or negative voltage selection, an RC holding circuit for storing signals, and a pair of MOS tubes used as switch discharge circuits, as well as an IO port and a triode for controlling the MOS tube. A pair of MOS tubes used as switch discharge circuits include a switch MOS tube and a compensation MOS tube. The positive pole of the gate diode is connected to the output end of the voltage follower isolation amplifier, that is, the signal to be collected will first enter the gate diode. The negative pole of the gate diode is connected to the charge and discharge end of the storage capacitor in the RC holding circuit. The gate diode is provided with an access voltage for positive and negative voltage gating, the D pole of the switch MOS tube is respectively connected to the charge and discharge end and the input end of the positive and negative voltage isolation amplifier, the first external voltage interface is respectively connected to the S pole and the G pole of the switch MOS tube, the C pole of the triode is connected to the IO port, the B pole of the triode is grounded, the E pole of the triode is connected to the G pole of the switch MOS tube, the S pole of the compensation MOS tube is connected to the G pole and the charge and discharge end, and the D pole of the compensation MOS tube is connected to the second external voltage interface. The IO port is used to control the switch MOS tube to be disconnected, so that the gate diode gates the target signal in the signal to be collected, and the target signal is a positive voltage signal or a negative voltage signal. The target signal is stored through the RC holding circuit. The output of the second external voltage interface is controlled so that the compensation MOS tube compensates the leakage current of the switch MOS tube. The peak voltage is collected through the positive and negative voltage isolation amplifier and the ADC.

[0067] When it is necessary to collect the peak voltage signal, the switch MOS tube is disconnected through the IO port and the transistor control, and the unidirectional conduction effect of the gate diode is utilized, and the access voltage set on the gate diode is matched, so that the peak voltage storage unit can select the positive peak voltage access or the negative peak voltage access. Next, the peak voltage is stored through the RC holding circuit. Since the D pole of the switch MOS tube is connected to the charging and discharging end of the storage capacitor of the RC holding circuit, a leakage current from the D pole to the S pole is generated, so the output of the second external voltage interface is controlled to be set to the upper limit of the voltage to be collected, so that the S pole of the compensation MOS tube is compensated to the charging and discharging end, and finally the peak voltage is collected through the positive and negative voltage isolation amplifier and ADC. In this scheme, the circuit structure is simple, and the leakage current of the switch MOS tube is compensated by the compensation MOS tube and the second external voltage, so that the acquisition accuracy of the AC peak voltage is greatly improved during the lighting and aging test of the screen cell.

[0068] See also Figure 2 The present application provides an embodiment of a leakage current compensation method, comprising: 201. Leakage current compensation is performed on the gate diode by using a compensation diode.

[0069] In this embodiment, there will be reverse current in the diode used for selection, which will actually cause loss of the voltage stored in the RC holding circuit, and will reduce the ADC acquisition accuracy. Therefore, in this embodiment, the peak voltage storage unit also includes a compensation diode, the positive electrode of the compensation diode is connected to the charge and discharge end, and the negative electrode of the compensation diode is connected to the third external voltage interface, that is, a group of diodes in opposite directions are connected in the circuit.

[0070] By controlling the output of the third external voltage interface, the compensation diode will provide a reverse current as compensation to the circuit. That is, in order to avoid the reverse leakage current of the gate diode, a reverse compensation diode is connected to the circuit, and its reverse access voltage is greater than the voltage to be collected to compensate for the reverse leakage current. The output of the third external voltage interface is usually slightly greater than the maximum value of the voltage to be collected. By compensating the reverse current of the gate diode accordingly, the loss can be reduced, and the acquisition accuracy of the AC peak voltage can be further improved.

[0071] See also Figure 3 The present application provides an embodiment of a method for generating a fitting curve of operating temperature and reverse current, comprising: 301. Isolate the gate diode on the peak voltage storage unit and connect the gate diode to the first detection circuit; 302. In a first detection circuit, input a detection voltage signal to the positive electrode of the gate diode, detect the reverse current and the diode temperature of the gate diode in real time, and obtain first detection data, where the first detection data is a fitting curve of the operating temperature and the reverse current of the gate diode, and the detection voltage signal is of the same type as the signal to be collected; 303. Isolate the compensation diode on the peak voltage storage unit and connect it to the second detection circuit; 304. Input a detection voltage signal to the cathode of the compensation diode in the second detection circuit, detect the reverse current and the diode temperature of the compensation diode in real time, and obtain second detection data, where the second detection data is a fitting curve of the operating temperature and reverse current of the compensation diode.

[0072] In this embodiment, diodes of the same model are usually selected, one as a gate diode and the other as a compensation diode, but there are also differences between the diodes, mainly considering the operating temperature difference, which may result in the compensation of the reverse current not being very accurate, resulting in reduced acquisition accuracy.

[0073] Therefore, before the acquisition, the two diodes are firstly isolated and tested. The isolation test is conducive to more accurate detection of the parameters of a single diode. The terminal inputs a detection voltage signal to the positive pole of the gate diode in the first detection circuit, detects the reverse current and diode temperature of the gate diode in real time, and obtains the first detection data. The first detection data is the fitting curve of the operating temperature and reverse current of the gate diode. The detection voltage signal is the same as the signal type to be collected. In the point screen scenario, the gate diode is used to pass the point screen signal and continue to run, so that the diode is heated. At this time, the reverse current and diode temperature are continuously detected, and the gate diode and the compensation diode are tested to obtain the fitting curve of the operating temperature and reverse current. It should be noted that even if the two diodes have the same signal, different heat may be generated during operation, that is, the temperature difference is different, resulting in differences in compensation current and reverse current. The present application can accurately analyze whether the reverse current and compensation current are too different during the level signal acquisition process through the first detection data and the second detection data, and then make adaptive adjustments.

[0074] See also Figure 4 The present application provides an embodiment of a method for adjusting the temperature of a gate diode and a compensation diode, comprising: 401. Detecting a first temperature of a gate diode and a second temperature of a compensation diode in real time; 402. Determine a real-time reverse current value according to the first temperature and the first detection data; 403. Determine a real-time compensation current value according to the second temperature and the second detection data; 404. When the real-time reverse current value and the real-time compensation current value do not meet the preset condition, adjust the temperature of the gate diode and the compensation diode, and re-measure until the difference between the real-time reverse current value and the real-time compensation current value meets the preset condition.

[0075] In this embodiment, after the compensation of the initial diode is completed, the terminal detects the first temperature of the selection diode and the second temperature of the compensation diode in real time, the terminal determines the real-time reverse current value through the first temperature and the first detection data, and the terminal determines the real-time compensation current value through the second temperature and the second detection data. When the real-time reverse current value and the real-time compensation current value do not meet the preset conditions, you can choose to temporarily shut down the operation of the current acquisition circuit, or use physical cooling, or adjust the input of the compensation current, which is not limited here, and re-measure the first temperature, the second temperature, the real-time reverse current value and the real-time compensation current value until the difference between the real-time reverse current value and the real-time compensation current value meets the preset conditions.

[0076] See also Figure 5 , the present application provides a device using a collection circuit, comprising: A first isolation unit 501, used to isolate the gate diode on the peak voltage storage unit and connect the gate diode to the first detection circuit; The second input unit 502 is used to input a detection voltage signal to the positive electrode of the gate diode in the first detection circuit, detect the reverse current and the diode temperature of the gate diode in real time, and obtain first detection data, where the first detection data is a fitting curve of the operating temperature and the reverse current of the gate diode, and the detection voltage signal is of the same type as the signal to be collected; A second isolation unit 503, used to isolate the compensation diode on the peak voltage storage unit and connect it to the second detection circuit; The third input unit 504 is used to input a detection voltage signal to the cathode of the compensation diode in the second detection circuit, detect the reverse current and the diode temperature of the compensation diode in real time, and obtain second detection data, where the second detection data is a fitting curve of the operating temperature and the reverse current of the compensation diode; The acquisition unit 505 is used to acquire the signal to be collected through a multiplexer, where the signal to be collected is a point-screen AC signal; An isolation unit 506 is used to follow and isolate the signal to be collected through a voltage follower isolation amplifier to prevent the entire collection circuit from interfering with the signal to be collected; An input unit 507, used to input the signal to be collected after following and isolating into a peak voltage storage unit; A first control unit 508, configured to control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to be disconnected through the first switch module and the second switch module, so that the gate diode gates the target signal in the signal to be collected, and the target signal is a positive pressure signal or a negative pressure signal; The storage unit 509 is used to store the target signal through the first RC circuit and the second RC circuit; A second compensation unit 510, configured to compensate the leakage current of the gate diode through a compensation diode; A first compensation unit 511 is used to compensate the leakage current of the switch MOS tube through the compensation MOS tube; A detection unit 512, used for detecting a first temperature of the gate diode and a second temperature of the compensation diode in real time; A first determining unit 513, configured to determine a real-time reverse current value according to a first temperature and first detection data; A second determining unit 514, configured to determine a real-time compensation current value according to a second temperature and a second detection data; The adjusting unit 515 is used to adjust the temperature of the gate diode and the compensation diode when the real-time reverse current value and the real-time compensation current value do not meet the preset condition, and re-measure until the difference between the real-time reverse current value and the real-time compensation current value meets the preset condition; The acquisition unit 516 is used to acquire the peak voltage through the positive / negative voltage isolation amplifier module and the ADC; The second control unit 517 is used to control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to be closed through the first switch module and the second switch module, so that the charging and discharging ends of the storage capacitors in the first RC circuit and the second RC circuit are grounded after passing through the switch MOS tubes, and enter the voltage discharge process; The third control unit 518 is used to control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to be disconnected through the first switch module and the second switch module after the voltage discharge is completed, and re-acquire a new signal to be collected.

[0077] See also Figure 6 , the present application provides a device using a collection circuit, comprising: Processor 601 , memory 602 , input / output unit 603 , and bus 604 .

[0078] The processor 601 is connected to the memory 602 , the input and output unit 603 , and the bus 604 .

[0079] The memory 602 stores a program, and the processor 601 calls the program to execute the following steps: Figure 1 , Figure 2 and Figure 3 The method in .

[0080] The present application provides a computer-readable storage medium, on which a program is stored, and when the program is executed on a computer, the program performs the following steps: Figure 1 , Figure 2 and Figure 3 The method in .

[0081] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0082] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0083] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0084] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0085] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), disk or optical disk and other media that can store program code.

Claims

1. A peak voltage acquisition circuit for a point screen AC signal, characterized in that: include: Multiplexer, voltage follower isolation amplifier, peak voltage storage unit, positive / negative voltage isolation amplifier module and ADC; The peak voltage storage unit includes a positive voltage peak gating module U2, a negative voltage peak gating module U1, a first RC circuit, a second RC circuit, a positive voltage discharge MOS tube module, a negative voltage discharge MOS tube module, a first switch module, a second switch module and a plurality of resistors. A gating diode for gating electrical signals is provided in the positive voltage peak gating module U2 and the negative voltage peak gating module U1. The positive voltage discharge MOS tube module and the negative voltage discharge MOS tube module both include a switch MOS tube for controlling discharge and a compensation MOS tube for supplementing leakage current of the switch MOS tube. The multiplexer is connected to the voltage follower isolation amplifier, the multiplexer is used to collect multiple signals to be tested, and the voltage follower isolation amplifier is used to prevent the collection circuit from interfering with the output signal; The voltage follower isolation amplifier is connected to the positive voltage peak gating module U2 and the negative voltage peak gating module U1 respectively; The positive pressure peak gating module U2 and the negative pressure peak gating module U1 are connected to the first RC circuit and the second RC circuit respectively; The first RC circuit and the second RC circuit are respectively connected to the input end of the positive isolation amplifier and the input end of the negative isolation amplifier on the positive / negative voltage isolation amplifier module; The positive pressure discharge MOS tube module is connected to the input end of the positive isolation amplifier, and the first switch module is connected to the switch MOS tube of the positive pressure discharge MOS tube module; The negative pressure discharge MOS tube module is connected to the input end of the negative isolation amplifier, and the second switch module is connected to the switch MOS tube of the negative pressure discharge MOS tube module; The output end of the positive / negative voltage isolation amplifier module is connected to the ADC.

2. The acquisition circuit according to claim 1, characterized in that: The positive pressure discharge MOS tube module includes a switch MOS tube Q1 and a compensation MOS tube Q5, and the negative pressure discharge MOS tube module includes a switch MOS tube Q2 and a compensation MOS tube Q6; The D1 pole of the switch MOS tube Q1 is connected to the input end of the positive isolation amplifier through the resistor R2, and the input end of the positive isolation amplifier is connected to the G2 pole and the S2 pole of the compensation MOS tube Q5 through the resistor R3; the S1 pole of the switch MOS tube Q1 is connected to the external voltage, and the G1 pole of the switch MOS tube Q1 is connected to the first switch module, and the first switch module is used to control the closing and opening of the switch MOS tube Q1; the D2 pole of the supplementary MOS tube Q5 is connected to the external voltage; The D1 pole of the switch MOS tube Q2 is connected to the input end of the negative isolation amplifier through the resistor R9, and the input end of the negative isolation amplifier is connected to the G2 pole and the S2 pole of the compensation MOS tube Q6 through the resistor R10; the S1 pole of the switch MOS tube Q2 is connected to the external voltage, and the G1 pole of the switch MOS tube Q1 is connected to the second switch module, and the second switch module is used to control the closing and opening of the switch MOS tube Q2; the D2 pole of the supplementary MOS tube Q6 is connected to the external voltage; The voltage follower isolation amplifier is connected to the K1 interface of the negative voltage peak gating module U1, and the negative voltage peak gating module U1 is used to gate the negative voltage; The A1 interface of the negative voltage peak gating module U1 is connected to the second RC circuit, and the second RC circuit is used to store the connected peak voltage signal; The second RC circuit is connected to the D1 pole of the switch MOS tube Q2 through the resistor R9, the second RC circuit is connected to the G2 pole and the S2 pole of the compensation MOS tube Q6 through the resistor R10, and the second RC circuit is connected to the positive input port of the negative voltage isolation amplifier; The voltage follower isolation amplifier is also connected to the A1 interface of the positive voltage peak gating module U2, and the positive voltage peak gating module U2 is used to gate the forward voltage; The K1 interface of the positive voltage peak gating module U2 is connected to the first RC circuit, and the first RC circuit is used to store the connected peak voltage signal; The first RC circuit is connected to the D1 pole of the switch MOS tube Q2 through the resistor R2, the first RC circuit is connected to the G2 pole and the S2 pole of the compensation MOS tube Q5 through the resistor R3, and the first RC circuit is connected to the positive input port of the positive voltage isolation amplifier; The negative input port and the output port of the positive voltage isolation amplifier are connected to the ADC; The negative input port and the output port of the negative voltage isolation amplifier are connected to the ADC.

3. The acquisition circuit according to claim 2, characterized in that: The positive pressure peak gating module U2 and the negative pressure peak gating module U1 are both provided with a gating diode and a compensation diode; The positive electrode and the negative electrode of the first gate diode are respectively connected to the A1 terminal and the K1 terminal in the positive voltage peak gate module U2; The anode of the first compensation diode is connected to the A3 terminal in the positive voltage peak gating module U2, and the cathode of the first compensation diode is connected to the external power supply; The first gating diode and the first compensation diode are in opposite directions; The A3 terminal in the positive voltage peak gating module U2 is connected to the resistor R4 and then connected to the input terminal of the positive isolation amplifier; The anode and cathode of the second gate diode are respectively connected to the K1 terminal and the A1 terminal in the negative voltage peak gate module U1; The anode of the second compensation diode is connected to the A3 terminal in the positive voltage peak gating module U1, and the cathode of the second compensation diode is connected to the external power supply; The second gating diode and the second compensation diode are in opposite directions; The K3 terminal in the negative voltage peak gating module U1 is connected to the resistor R11 and then connected to the input terminal of the negative isolation amplifier.

4. The acquisition circuit according to claim 3, characterized in that: The first switch module includes a transistor Q3, a resistor R5, a resistor R6 and a resistor R7; The G1 electrode of the switch MOS tube Q1 is connected to the collector electrode of the transistor Q3 through the resistor R7; The external voltage is connected to the collector of the transistor Q3 through the resistor R6; The first IO port is connected to the emitter of the transistor Q3 through the resistor R5; The base of the transistor Q3 is grounded; The second switch module includes a transistor Q4, a resistor R12, a resistor R13 and a resistor R14; The G1 electrode of the switch MOS tube Q2 is connected to the collector of the transistor Q4 through the resistor R13; The external voltage is connected to the collector of the transistor Q4 through the resistor R12; The second IO port is connected to the emitter of the transistor Q4 through the resistor R14; The base of the transistor Q4 is connected to an external voltage.

5. A method for using the acquisition circuit as claimed in claim 4, characterized in that: include: Acquire the signal to be collected through a multiplexer, wherein the signal to be collected is a point-screen AC signal; The signal to be collected is followed and isolated by a voltage follower isolation amplifier to prevent the entire collection circuit from interfering with the signal to be collected; Inputting the signal to be collected after following and isolating into a peak voltage storage unit; The switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module are controlled to be disconnected by the first switch module and the second switch module, so that the gate diode gates the target signal in the signal to be collected, and the target signal is a positive pressure signal or a negative pressure signal; Storing the target signal through a first RC circuit and a second RC circuit; Performing leakage current compensation on the switch MOS tube by using a compensation MOS tube; Peak voltage is collected through positive / negative voltage isolation amplifier module and ADC; The switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module are controlled to be closed by the first switch module and the second switch module, so that the charging and discharging ends of the storage capacitors in the first RC circuit and the second RC circuit are grounded after passing through the switch MOS tubes, and enter the voltage discharge process; When the voltage discharge is completed, the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module are controlled to be disconnected through the first switch module and the second switch module, and a new signal to be collected is obtained again.

6. The method according to claim 5, characterized in that After storing the target signal through the RC circuit and before collecting the peak voltage through the positive / negative voltage isolation amplifier module and the ADC, the method further includes: The leakage current of the gate diode is compensated by a compensation diode.

7. The method according to claim 6, characterized in that Before acquiring the signal to be collected through the multiplexer, the method further includes: Isolating a gate diode on a peak voltage storage unit and connecting the gate diode to a first detection circuit; In a first detection circuit, a detection voltage signal is input to the positive electrode of the gate diode, and the reverse current and diode temperature of the gate diode are detected in real time to obtain first detection data, wherein the first detection data is a fitting curve of the operating temperature and reverse current of the gate diode, and the detection voltage signal is of the same type as the signal to be collected; Isolating the compensation diode on the peak voltage storage unit and connecting it to the second detection circuit; In the second detection circuit, a detection voltage signal is input to the cathode of the compensation diode, and the reverse current and the diode temperature of the compensation diode are detected in real time to obtain second detection data, which is a fitting curve of the operating temperature and reverse current of the compensation diode.

8. The collection method according to claim 7, characterized in that: After controlling the output of the third external voltage interface so that the compensation diode performs leakage current compensation on the gate diode, and before collecting the peak voltage through the positive and negative voltage isolation amplifier and the ADC, the collection method further includes: Real-time detection of a first temperature of the gate diode and a second temperature of the compensation diode; Determine a real-time reverse current value by using the first temperature and the first detection data; Determine a real-time compensation current value according to the second temperature and the second detection data; When the real-time reverse current value and the real-time compensation current value do not meet the preset condition, the temperature of the gate diode and the compensation diode is adjusted, and re-measured until the difference between the real-time reverse current value and the real-time compensation current value meets the preset condition.

9. A device using the acquisition circuit as claimed in claim 4, characterized in that: include: An acquisition unit, used for acquiring a signal to be acquired through a multiplexer, wherein the signal to be acquired is a point-to-screen AC signal; An isolation unit, used for following and isolating the signal to be collected through a voltage follower isolation amplifier, so as to prevent the entire collection circuit from interfering with the signal to be collected; An input unit, used for inputting the signal to be collected after following and isolating into a peak voltage storage unit; A first control unit, used for controlling the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to be disconnected through the first switch module and the second switch module, so that the gating diode gates the target signal in the signal to be collected, and the target signal is a positive pressure signal or a negative pressure signal; A storage unit, used to store the target signal through a first RC circuit and a second RC circuit; A first compensation unit, used for compensating the leakage current of the switch MOS tube through a compensation MOS tube; A collection unit, used for collecting peak voltage through a positive / negative voltage isolation amplifier module and an ADC; A second control unit is used to control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to be closed through the first switch module and the second switch module, so that the charging and discharging ends of the storage capacitors in the first RC circuit and the second RC circuit are grounded after passing through the switch MOS tubes, and enter the voltage discharge process; The third control unit is used to control the switch MOS tubes in the positive pressure discharge MOS tube module and the negative pressure discharge MOS tube module to disconnect through the first switch module and the second switch module after the voltage discharge is completed, and re-acquire a new signal to be collected.

10. A device using the acquisition circuit as claimed in claim 4, characterized in that: Includes processor, memory, input and output unit and bus; The processor is connected to the memory, the input and output unit, and the bus; The memory stores a program, and the processor calls the program to execute the method according to any one of claims 5 to 8.

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