Program-controlled ultrahigh-voltage insulation and withstand voltage test system

Abstract

The utility model discloses a program-controlled ultrahigh-voltage insulation and withstand voltage test system, which comprises a display key module, a main control board module, a power transformer module, a power amplifier board module, a high-voltage transformer module, a high-voltage resistance box module, a high-voltage signal sampling module, a high-voltage output module and an upper computer, wherein a test instruction is set through the display key module or the upper computer, the main control board module outputs an analog voltage DAC signal according to internal program control, and the power amplifier board module outputs a 0-25V alternating current signal to the high-voltage transformer module through signal amplification; after being boosted by the high-voltage transformer module, the high-voltage resistance box module outputs alternating-current 20KV high-voltage signals and direct-current 20KV high-voltage signals and outputs high voltage through the high-voltage output module, and the high-voltage signal sampling module collects signals of the high-voltage transformer module and the high-voltage resistance box module and feeds the signals back to the main control board module. According to the utility model, on-site test control and remote test control can be carried out, the automation degree is high, and the safety and the working efficiency of an ultrahigh voltage insulation and withstand voltage test are improved.

Description

Technical Field

[0001] The utility model relates to an ultra-high voltage test system, in particular to a program-controlled ultra-high voltage insulation and withstand voltage test system. Background Art

[0002] The ultra-high voltage test system is mainly used for ultra-high voltage withstand test of household appliances, wires and cables, instruments and meters, ultimate voltage withstand test of insulating materials, polarization of electroacoustic equipment, etc. Most of the existing ultra-high voltage testers are mainly based on analog regulation to boost voltage to ultra-high voltage, and very few are program-controlled ultra-high voltage tests. Testers need to manually adjust at close range, and the safety factor is low. The display is generally a digital tube, which is blurry when observed from a distance. Utility Model Content

[0003] In view of the above problems existing in the prior art, the utility model provides a program-controlled ultra-high voltage insulation withstand voltage test system.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A program-controlled ultra-high voltage insulation withstand voltage test system comprises a display button module, a main control board module, a power transformer module, a power amplifier board module, a high voltage transformer module, a high voltage resistor box module, a high voltage signal sampling module, a high voltage output module and a host computer, wherein the main control board module and the power amplifier board module are powered by the power transformer module, a test instruction is set by the display button module or the host computer and sent to the main control board module, the main control board module outputs an analog voltage DAC signal to the power amplifier board module according to internal program control, the power amplifier board module outputs a 0-25V AC signal to the high voltage transformer module through signal amplification, an AC 20KV high voltage signal and a DC 20KV high voltage signal are output by the high voltage resistor box module after being boosted by the high voltage transformer module, and the high voltage is output through the high voltage output module, and the high voltage signal sampling module collects signals from the high voltage transformer module and the high voltage resistor box module and feeds them back to the main control board module.

[0006] Specifically, the display button module includes an LCD display screen and independent operation buttons connected to the main control board module through an FPC cable.

[0007] Specifically, the power transformer module is configured for AC 220V input, and the output is a single group of 9V*1A AC voltage, a double group of 18.5V*1A AC voltage and a single group of 40V*12A AC voltage, among which the single group of 9V*1A AC voltage and the double group of 18.5V*1A AC voltage are both used to power the main control board module, and the single group of 40V*12A AC voltage is used to power the power amplifier board module.

[0008] Specifically, the power amplifier board module is configured with a triode power amplifier circuit for receiving the analog voltage DAC signal output by the main control board module and amplifying and outputting a 0-25V AC signal. The triode power amplifier circuit receives power from the power transformer module through a rectifier and filter circuit.

[0009] Specifically, the high-voltage transformer module is configured as a primary input single winding AC: 0-25V, a post-stage output dual winding AC: 2*(0-20KV), wherein the high-voltage tail is connected to a high-voltage signal sampling module.

[0010] Specifically, the high-voltage resistor box module includes a high-voltage AC output circuit connected to one output of the high-voltage transformer module, and a high-voltage DC output circuit connected to another output of the high-voltage transformer module, wherein an AC 20KV high-voltage signal is output through the high-voltage AC output circuit, and a DC 20KV high-voltage signal is output through the high-voltage DC output circuit, and both the high-voltage AC output circuit and the high-voltage DC output circuit are connected to a high-voltage signal sampling module.

[0011] Specifically, the high-voltage output module is configured as a high-voltage output socket.

[0012] Specifically, the main control board module includes a power supply circuit connected to the power transformer module for providing DC power to each module unit, a single-chip microcomputer and a complex programmable logic device CPLD communicating through a bus, and a DAC output unit connected to the complex programmable logic device CPLD for outputting an analog voltage DAC signal, wherein the single-chip microcomputer and the complex programmable logic device CPLD are both connected to the high-voltage signal sampling module, the display button module is connected to the single-chip microcomputer through an FPC cable, and the host computer is connected to the single-chip microcomputer through an RS232 interface unit.

[0013] Specifically, the high-voltage signal sampling module includes a high-voltage AC sampling circuit and a high-voltage DC sampling circuit for collecting signals from the high-voltage resistor box module and feeding them back to the main control board module, as well as a high-voltage loop sampling circuit for collecting signals from the high-voltage transformer module and feeding them back to the main control board module.

[0014] Specifically, the high-voltage loop sampling circuit includes a current gear switching circuit connected to the high-voltage tail of the high-voltage transformer module, a switching drive circuit connected to the main control board module and connected to the current gear switching circuit, and a sampling feedback processing circuit connected to the current gear switching circuit for providing a feedback signal to the main control board module.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model is composed of 9 parts, including a display button module, a main control board module, a power transformer module, an amplifier board module, a high-voltage transformer module, a high-voltage resistor box module, a high-voltage signal sampling module, a high-voltage output module and a host computer, to form a closed-loop control system. The maximum output can reach AC: 20KV and DC: 20KV, which can meet the ultra-high voltage insulation withstand voltage test process. Moreover, the test operation and result display can be performed through the display button module, and the host computer can be remotely controlled. It is also convenient to observe and view the on-site test data from a distance during the test, and the automation degree is high, which greatly improves the safety and work efficiency of the entire ultra-high voltage AC and DC insulation withstand voltage test process. The utility model is ingenious in design, simple in structure, easy to use, and suitable for application in ultra-high voltage insulation withstand voltage test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an overall structural diagram of an embodiment of the utility model.

[0018] Figure 2 This is a schematic diagram of the interface terminal circuit of the display button module corresponding to the main control board module in the embodiment of the utility model.

[0019] Figure 3 This is a schematic diagram of the single-chip microcomputer circuit of the main control board module in the embodiment of the utility model.

[0020] Figure 4 This is a CPLD circuit schematic diagram of the main control board module in the embodiment of the utility model.

[0021] Figure 5 This is a circuit schematic diagram of the first power supply circuit in the embodiment of the utility model.

[0022] Figure 6 This is a circuit schematic diagram of the second power supply circuit in the embodiment of the utility model.

[0023] Figure 7 This is a circuit schematic diagram of the third power supply circuit in the embodiment of the utility model.

[0024] Figure 8 The following is a circuit diagram of the RS232 interface unit in the embodiment of the present invention.

[0025] Fig. 9 This is a circuit schematic diagram of a DAC output unit in an embodiment of the present utility model.

[0026] Fig.10 This is a circuit schematic diagram of the rectifier and filter circuit of the power amplifier board module in the embodiment of the utility model.

[0027] Fig.11 This is the first part of the circuit principle diagram of the triode power amplifier circuit in the embodiment of the utility model.

[0028] Fig.12 This is the second part of the circuit principle diagram of the triode power amplifier circuit in the embodiment of the utility model.

[0029] Fig.13 This is a circuit schematic diagram of a high-voltage transformer module and a high-voltage resistor box module in an embodiment of the utility model.

[0030] Fig.14 This is a circuit schematic diagram of a high-voltage AC sampling circuit and a high-voltage DC sampling circuit in an embodiment of the utility model.

[0031] Fig.15 This is a circuit schematic diagram of the current gear switching circuit in the embodiment of the utility model.

[0032] Fig.16 This is a circuit schematic diagram of a switching drive circuit in an embodiment of the utility model.

[0033] Fig.17 The first part of the circuit schematic diagram of the sampling feedback processing circuit in the embodiment of the present invention.

[0034] Fig.18 The second part of the circuit schematic diagram of the sampling feedback processing circuit in the embodiment of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The implementation methods of the present invention include but are not limited to the following embodiments.

[0036] Example

[0037] like Figures 1 to 18 As shown, the program-controlled ultra-high voltage insulation withstand voltage test system is mainly composed of 9 parts, including a display button module 1, a power transformer module 2, a main control board module 3, a power amplifier board module 4, a high-voltage transformer module 5, a high-voltage resistor box module 6, a high-voltage signal sampling module 7, a high-voltage output module 8 and a host computer 9. The main control board module and the power amplifier board module are powered by the power transformer module, and the test instructions are set and sent to the main control board module through the display button module or the host computer. The main control board module outputs an analog voltage DAC signal to the power amplifier board module according to the internal program control, and the power amplifier board module outputs a 0-25V AC signal to the high-voltage transformer module through signal amplification. After the high-voltage transformer module is stepped up, the high-voltage resistor box module outputs an AC 20KV high-voltage signal and a DC 20KV high-voltage signal and outputs high voltage through the high-voltage output module. The high-voltage signal sampling module collects the signals of the high-voltage transformer module and the high-voltage resistor box module and feeds them back to the main control board module.

[0038] Specifically, the display button module includes an LCD display screen and independent operation buttons connected to the main control board module through an FPC cable. Among them, the LCD display screen can use a 7-inch LCD with a serial port interface, which is connected to the configuration interface on the main control board through the serial port; the independent operation buttons include numeric buttons numbered 0-9, and multiple function buttons, such as ESC, ENTER, FILE, SETUP, F1, F2, F3, F4, F5, LOCK, TEST, BACK and other function buttons. In order to facilitate the key signal collection of the independent operation buttons, the display button module is also configured with a key acquisition chip. The key acquisition chip uses a single-chip microcomputer with the model STM32F103RBT6 and is packaged as LQFP64. The key acquisition chip communicates with the interface configured on the main control board through the corresponding interface. In addition, the display button module can also be configured with LED indicator lights corresponding to different function indications, and the LEDs are driven by the IO pins of the single-chip microcomputer of the key acquisition chip, such as TEST, SETUP, SYS, FILE, PASS, LOCK, HV, FAIL and other indicator lights. Figure 2 The figure shows the circuit schematic diagram of the key interface terminal KEY and the display interface terminal LCD configured on the main control board. The interfaces KEY_RXD, KEY_TXD, LCD_RXD, and LCD_TXD are used to connect to the main control board microcontroller.

[0039] Specifically, the power transformer module is configured for AC 220V input, and the output is a single group of 9V*1A AC voltage, a double group of 18.5V*1A AC voltage and a single group of 40V*12A AC voltage, among which the single group of 9V*1A AC voltage and the double group of 18.5V*1A AC voltage are both used to power the main control board module, and the single group of 40V*12A AC voltage is used to power the power amplifier board module.

[0040] Specifically, the main control board module includes a power supply circuit connected to the power transformer module for providing direct current power to each module unit, a single-chip microcomputer and a complex programmable logic device CPLD communicating through a bus, and a DAC output unit connected to the complex programmable logic device CPLD for outputting an analog voltage DAC signal, wherein the single-chip microcomputer can be selected as the STM32F429 model, and the main program control logic is processed by the single-chip microcomputer U1. The CPLD can be selected as the EPM570T144C5N model, which mainly processes start and stop signals and outputs sinusoidal wave signals through the DAC output unit. The single-chip microcomputer and the complex programmable logic device CPLD are both connected to the high-voltage signal sampling module for receiving corresponding sampling signals and controlling signal sampling; the display button module is connected to the single-chip microcomputer through an FPC cable, and the host computer is connected to the single-chip microcomputer through an RS232 interface unit.

[0041] In order to better realize the functions of the main control board module, corresponding peripheral circuits, interfaces and devices can also be configured on it, such as external crystal oscillator, storage unit, operation indicator light, etc. The storage unit includes SPI FLASH and EEPROM. SPI FLASH uses SPI serial communication storage chip W25Q64 to facilitate storage and export of test data. EEPROM uses I2C serial communication storage chip 24C64 to store set data or data calibrated before the instrument leaves the factory. Figure 3 The circuit schematic diagram of the microcontroller U1 shown in the figure, the interfaces CPLD_SSEL, CPLD_CLK, CPLD_MOSI, CPLD_MISO, CPLD_INT, CPLD_SP, CPLD_RST are used to connect the bus to communicate with the CPLD, the interfaces XTA1, XTA2, XTA3, XTA4 are used to connect the external crystal oscillator, and the interfaces SPI-CS, SPI-CLK, SPI-DO, SPI-DI are used to connect the SPI FLASH storage unit, interface E2PROM_SDA, E2PROM_SCL is used to connect EEPROM storage unit, interface TMS_SWDIO, TCK_SWCLK, NRST is used to connect the program burning port configured by the microcontroller, interface ADI, AC-ADV1, DC-ADV2 is used to connect the corresponding interface of the high-voltage signal sampling module, interface KEY_RXD, KEY_TXD, LCD_RXD, LCD_TXD is used to connect the key interface terminal and the display interface terminal to realize the communication with the display key module, interface RS232_TX, RS232_RX is used to connect the RS232 interface unit to realize the communication with the host computer, interface RUN1, ERR1 is used to connect the corresponding indicator light. Figure 4 The circuit schematic diagram of the complex programmable logic device CPLD shown in the figure, the interfaces TEST_START and TEST_STOP are used to receive the start and stop signals, the interfaces RELAY1, RELAY2, RELAY3, RELAY4, RELAY5, RELAY6, and RELAY7 are used for the corresponding interfaces of the high-voltage signal sampling module to output the control signal of the signal sampling, the device X3 is a crystal oscillator, the interfaces TMS, TDI, TCK, and TDO are used to receive external debugging signals through the debugging port terminals, the interfaces DB1-DB8 are used to connect the related interfaces of the DAC output unit, and the interfaces CPLD_CLK, CPLD_MOSI, CPLD_MISO, CPLD_RST, CPLD_SP, CPLD_INT, and CPLD_SSEL are used to connect the bus to communicate with the microcontroller U1.

[0042] The power supply circuit includes a first power supply circuit for providing DC +5V and DC +3.3V, a second power supply circuit for providing DC +15V and DC -15V, and a third power supply circuit for providing DC +24V. Figure 5 The circuit schematic diagram of the first power supply circuit shown in the figure rectifies and steps down the AC 9V voltage to DC+5V and DC+3.3V. The device D1 is a KBP306 rectifier bridge. The interfaces AC9V-A and AC9V-B are used to input a set of 9V AC voltage. The device U2 is a L7805 three-terminal voltage regulator. The device U3 is a 1117-3.3 voltage regulator chip. The interface +5V is used to output a +5V DC voltage. The interface +3.3V is used to output a +3.3V DC voltage. Figure 6 The circuit schematic diagram of the second power supply circuit shown in the figure rectifies and steps down the AC 18.5V AC voltage to DC+15V DC voltage and DC-15V DC voltage. The device D2 is a KBP306 rectifier bridge. The interfaces AC18.5V-A and AC18.5V-B are used to input a set of 18.5V AC voltage. The devices U4 and U5 are both L7815ACV-DG voltage regulator chips. The interface +15V is used to output a +15V DC voltage, and the interface -15V is used to output a -15V DC voltage. Figure 7 The circuit schematic diagram of the third power supply circuit shown in the figure rectifies and boosts the AC 18.5V AC voltage to a DC+24V DC voltage. The device D3 is a KBP306 rectifier bridge. The interfaces AC18.5V-A2 and AC18.5V-B2 are used to input another set of 18.5V AC voltage. The device U6 is a L7824 three-terminal regulator. The interface +24V is used to output a +24V DC voltage.

[0043] like Figure 8 The circuit schematic diagram of the RS232 interface unit shown in the figure uses a communication chip of model SP3232 and an RS232 interface for communicating with the host computer, wherein the interfaces RS232_TX and RS232_RX are used to connect to the corresponding interfaces of the microcontroller U1. Fig. 9 The circuit schematic diagram of the DAC output unit shown in the figure adopts the DAC0800 series digital-to-analog converter chip D10 to realize the sinusoidal wave signal output to the power amplifier board module. The interface VREF+ is used to input the reference voltage of the digital-to-analog converter chip D10, and the interface DB1-DB8 is used to connect the relevant interface of the CPLD. The interface symbol SIN_WAVE represents the output end of the digital-to-analog converter chip D10 to output the sinusoidal wave signal to the power amplifier board module.

[0044] Specifically, the power amplifier board module is equipped with a triode power amplifier circuit, which is used to receive the analog voltage DAC signal output by the main control board module and amplify and output a 0-25V AC signal. The triode power amplifier circuit receives power from the power transformer module through a rectifier and filter circuit. Fig.10 The circuit schematic diagram of the rectifier and filter circuit shown in the figure rectifies and steps down the AC 40V AC voltage to DC+56V DC voltage and DC-56V DC voltage. The device D4 is a KBPC3510 rectifier bridge. The interfaces AC40V-A and AC40V-B are used to input a set of 40V AC voltage. The interface DC56V+ is used to output a +56V DC voltage. The interface DC56V- is used to output a -56V DC voltage to power the transistor amplifier circuit. Fig.11 and Fig.12 The circuit schematic diagram of the transistor power amplifier circuit shown in the figure, the contact AA and the contact BB are the common connection points of the first part and the second part, the interface IOUT is used to connect the output end of the digital-to-analog converter chip D10 to receive the sine wave signal output by the main control board module, that is, the analog voltage DAC signal, the sine wave signal is sequentially amplified and negatively fed back through the OP07C operational amplifier chips U85 and U15, the C2235 transistor Q4 and the A965 transistor Q6 are the front-stage driving pair of the power amplifier circuit, and the rear-stage transistors Q5, Q8, Q9, Q10, Q11, Q13, Q14, Q15, Q16, Q17 are driven by the front-stage driving, and these rear-stage transistors are of C5198 model, and the signal amplified by current is output to the terminal JOUT1, and then connected to the primary input end of the high-voltage transformer module to achieve output AC: 0 ~ 25V.

[0045] Specifically, the high-voltage transformer module is configured as a primary input single winding AC: 0-25V, a post-stage output dual winding AC: 2*(0-20KV), wherein the high-voltage tail is connected to a high-voltage signal sampling module. The high-voltage resistor box module includes a high-voltage AC output circuit connected to one output of the high-voltage transformer module, and a high-voltage DC output circuit connected to another output of the high-voltage transformer module, wherein an AC 20KV high-voltage signal is output through the high-voltage AC output circuit, and a DC 20KV high-voltage signal is output through the high-voltage DC output circuit, and both the high-voltage AC output circuit and the high-voltage DC output circuit are connected to the high-voltage signal sampling module. The high-voltage output module is configured as a high-voltage output socket.

[0046] like Fig.13As shown, the ratio of the primary to the post-stage of the high-voltage transformer T1 is 1:800, interfaces AC25V_OUT1 and AC25V_OUT2 are used to connect the terminal JOUT1 of the power amplifier board module to realize the primary input, interface AC20KV and interface DC20KV are used to connect the high-voltage resistor box module to realize the post-stage output, interface AC20KV is connected to the high-voltage AC output circuit, interface DC20KV is connected to the high-voltage DC output circuit, and interface EX_HV- is a high-voltage tail, which is used to connect the high-voltage signal sampling module as the high-voltage loop end. The high-voltage AC output circuit includes a resistor R103, a resistor R289, an inductor L1 and an output interface AC-HV-OUT+ connected in sequence, and a resistor R290 and a resistor R291, one end of which is connected in series between the resistor R289 and the inductor L1 and the other end is grounded, and a sampling node AC-ADC is configured between the resistor R290 and the resistor R291 to connect to the high-voltage signal sampling module, and the output interface AC-HV-OUT+ is used to connect the high-voltage output socket to realize 20KV AC voltage output; the high-voltage DC output circuit includes a diode D19, a resistor D289, an inductor L1 and an output interface AC-HV-OUT+ connected in sequence. R295, resistor R296, inductor L2 and output interface DC-HV-OUT+, resistor R294 and capacitor C173, one end of which is connected in series between resistor R296 and inductor L2 and the other end is grounded, and resistor R297 and resistor R298, one end of which is connected in series between resistor R296 and inductor L2 and the other end is grounded, and a sampling node DC-ADC is configured between resistor R297 and resistor R298 to connect with the high-voltage signal sampling module, and the output interface DC-HV-OUT+ is used to connect the high-voltage output socket to achieve 20KV DC voltage output. Among them, resistors R103, R289, R290, R295, R296, R294, and R297 are all high-voltage resistors, and a specific layout is sampled in the high-voltage resistor box module for installation and injection of sealant to prevent the ultra-high voltage from ionizing with the outside air and to prevent interference with other peripheral circuit components.

[0047] Specifically, the high-voltage signal sampling module includes a high-voltage AC sampling circuit and a high-voltage DC sampling circuit for collecting signals from the high-voltage resistor module and feeding them back to the main control board module, and a high-voltage loop sampling circuit for collecting signals from the high-voltage transformer module and feeding them back to the main control board module. Fig.14The circuit schematic diagram of the high-voltage AC sampling circuit and the high-voltage DC sampling circuit shown in the figure, the high-voltage AC sampling circuit is connected to the sampling node AC-ADC in the high-voltage resistor box module, and the high-voltage resistor R290100M / 100W and the resistor R291 6.2K are used for voltage division sampling at the sampling node AC-ADC. The sampling signals are amplified by the operational amplifier chips U25, U26, and U27 of model OP07C in turn, and then rectified and filtered to output the high-voltage AC sampling signal AC-ADC1, and then fed back to the corresponding interface of the single-chip computer U1; the high-voltage DC sampling circuit is connected to the sampling node DC-ADC in the high-voltage resistor box module, and the high-voltage resistor R297100M / 100W and the resistor R298 6.2K are used for voltage division sampling at the sampling node DC-ADC. The sampling signals are amplified by the operational amplifier chips U76, U77, and U78 of model OP07C in turn, and then rectified and filtered to output the high-voltage DC sampling signal DC-ADC2, and then fed back to the corresponding interface of the single-chip computer U1.

[0048] Specifically, the high-voltage loop sampling circuit includes a current gear switching circuit connected to the high-voltage tail of the high-voltage transformer module, a switching drive circuit connected to the main control board module and connected to the current gear switching circuit, and a sampling feedback processing circuit connected to the current gear switching circuit for providing a feedback signal to the main control board module. Fig.15 As shown in the circuit schematic diagram of the current gear switching circuit, the interface HV- is the high-voltage loop end, which is used to connect the high-voltage tail of the high-voltage transformer module, the contact VI+ is used to connect the sampling feedback processing circuit, the devices K2~K7 are relays, which can realize the switching of six current gears, and the interfaces RLY1~RLY6 are used to connect the switching drive circuit. Fig.16 As shown in the circuit schematic diagram of the switching drive circuit, interfaces RELAY1 to RELAY7 are used to connect to the corresponding interfaces of the CPLD to receive control signals, and interfaces RLY1 to RLY6 are used to connect to the corresponding interfaces of the current gear switching circuit. After being processed by the relay driver chip U31, the control signal is output from any one of interfaces RLY1 to RLY6 to the current gear switching circuit to realize the switching and control of the corresponding relay. Fig.17 and Fig.18 The circuit schematic diagram of the sampling feedback processing circuit shown in the figure, the contact VI+ is used to connect the current gear switching circuit to realize the signal sampling of the high-voltage tail of the high-voltage transformer module. The sampling signal is processed by the operational amplifier chips U79, U80, U81, U20, and U18 of model OP07C in turn to become a DC signal ADI, and is fed back to the corresponding interface of the single-chip computer U1. The three sampling signals AC-ADC1, DC-ADC2, and ADI are all analog signals.

[0049] Through the above circuit and process, a closed-loop test control system is formed. The single-chip microcomputer U1 determines whether the returned data is abnormal according to the parameters set by the user and performs closed-loop adjustment. When the utility model is used, the input parameters and instructions can be operated through the display key module for on-site test feedback display, or the parameters and instructions can be sent by the host computer for remote control testing and feedback, and the overall automation level is high, which greatly improves the safety and work efficiency of the entire ultra-high voltage AC and DC withstand voltage insulation test system.

[0050] The above embodiments are only preferred embodiments of the present utility model and are not intended to limit the protection scope of the present utility model. Any changes that adopt the design principles of the present utility model and are made through non-creative labor on this basis should fall within the protection scope of the present utility model.

Claims

1. A program-controlled ultra-high voltage insulation withstand voltage test system, characterized in that: It includes a display button module, a main control board module, a power transformer module, a power amplifier board module, a high-voltage transformer module, a high-voltage resistor box module, a high-voltage signal sampling module, a high-voltage output module and a host computer, wherein the main control board module and the power amplifier board module are powered by the power transformer module, the test instructions are set by the display button module or the host computer and sent to the main control board module, the main control board module outputs an analog voltage DAC signal to the power amplifier board module according to internal program control, the power amplifier board module outputs a 0-25V AC signal to the high-voltage transformer module through signal amplification, after the high-voltage transformer module boosts the voltage, the high-voltage resistor box module outputs an AC 20KV high-voltage signal and a DC 20KV high-voltage signal and outputs high voltage through the high-voltage output module, the high-voltage signal sampling module collects the signals of the high-voltage transformer module and the high-voltage resistor box module and feeds them back to the main control board module.

2. The program-controlled ultra-high voltage insulation withstand voltage test system according to claim 1, characterized in that: The display button module includes an LCD display screen and independent operation buttons connected to the main control board module via an FPC cable.

3. The program-controlled ultra-high voltage insulation withstand voltage test system according to claim 1, characterized in that: The power transformer module is configured for AC 220V input, and outputs a single group of 9V*1A AC voltage, a double group of 18.5V*1A AC voltage, and a single group of 40V*12A AC voltage, wherein the single group of 9V*1A AC voltage and the double group of 18.5V*1A AC voltage both power the main control board module, and the single group of 40V*12A AC voltage powers the power amplifier board module.

4. The program-controlled ultra-high voltage insulation withstand voltage test system according to claim 1, characterized in that: The power amplifier board module is equipped with a triode power amplifier circuit for receiving the analog voltage DAC signal output by the main control board module and amplifying and outputting a 0-25V AC signal. The triode power amplifier circuit receives power from the power transformer module through a rectifier and filter circuit.

5. The program-controlled ultra-high voltage insulation withstand voltage test system according to claim 1, characterized in that: The high-voltage transformer module is configured as a primary input single winding AC: 0-25V, a post-stage output dual winding AC: 2*(0-20KV), wherein the high-voltage tail is connected to a high-voltage signal sampling module.

6. The program-controlled ultra-high voltage insulation withstand voltage test system according to claim 5, characterized in that: The high-voltage resistor box module includes a high-voltage AC output circuit connected to one output of the high-voltage transformer module, and a high-voltage DC output circuit connected to another output of the high-voltage transformer module, wherein an AC 20KV high-voltage signal is output through the high-voltage AC output circuit, and a DC 20KV high-voltage signal is output through the high-voltage DC output circuit, and both the high-voltage AC output circuit and the high-voltage DC output circuit are connected to a high-voltage signal sampling module.

7. The program-controlled ultra-high voltage insulation and withstand voltage test system according to claim 1, characterized in that: The high voltage output module is configured as a high voltage output socket.

8. The program-controlled ultra-high voltage insulation and withstand voltage test system according to any one of claims 1 to 7, characterized in that: The main control board module includes a power supply circuit connected to the power transformer module for providing direct current power to each module unit, a single-chip microcomputer and a complex programmable logic device CPLD communicating through a bus, and a DAC output unit connected to the complex programmable logic device CPLD for outputting an analog voltage DAC signal, wherein the single-chip microcomputer and the complex programmable logic device CPLD are both connected to the high-voltage signal sampling module, the display button module is connected to the single-chip microcomputer via an FPC cable, and the host computer is connected to the single-chip microcomputer via an RS232 interface unit.

9. The program-controlled ultra-high voltage insulation and withstand voltage test system according to any one of claims 1 to 7, characterized in that: The high-voltage signal sampling module includes a high-voltage AC sampling circuit and a high-voltage DC sampling circuit for collecting signals from the high-voltage resistor box module and feeding them back to the main control board module, as well as a high-voltage loop sampling circuit for collecting signals from the high-voltage transformer module and feeding them back to the main control board module.

10. The program-controlled ultra-high voltage insulation and withstand voltage test system according to claim 9, characterized in that: The high-voltage loop sampling circuit includes a current gear switching circuit connected to the high-voltage tail of the high-voltage transformer module, a switching drive circuit connected to the main control board module and connected to the current gear switching circuit, and a sampling feedback processing circuit connected to the current gear switching circuit for providing a feedback signal to the main control board module.

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