Program-controlled high-voltage capacitor leakage current test system
By designing a programmable high-voltage capacitor leakage current test system, using the fast discharge control module and the high-voltage relay module to realize the charging and discharge control of high-voltage capacitors, the problem that existing test instruments cannot be discharged quickly is solved, safety and work efficiency are improved, and the AC:5KV DC:6KV output.
Patent Information
- Application Number
- CN202420538967.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-03-20
AI Technical Summary
The leakage current testing instruments of existing high-voltage capacitors cannot be discharged quickly and effectively after the test is completed, and there is a risk of electric shock.
A program-controlled high-voltage capacitor leakage current testing system is designed, including main control board module, display and button module, power transformer module, power amplifier board module, quick discharge control module, high-voltage signal sampling module and PC upper computer module, through high-voltage relay module The high-voltage output module realizes charging and discharging control of high-voltage capacitors to ensure rapid discharge after testing.
It improves the safety and working efficiency of the test system, ensures that the high-voltage capacitor can be discharged quickly after testing, reduces the risk of electric shock, improves the degree of automation, and the maximum output can reach AC:5KV DC:6KV.
Smart Images
Figure CN222299764U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of leakage current testing, in particular to a program-controlled high-voltage capacitor leakage current testing system. Background Art
[0002] At present, the test system is designed into an intelligent type through a single-chip microcomputer. It is mainly composed of a single-chip microcomputer, a keyboard, a display screen, a power transformer, a high-voltage transformer, a high-voltage voltage sampling module, and a fast discharge control module to form a closed-loop control system. The maximum output can reach AC: 5KV 100mADC: 6KV 50mA. The display is a 7-inch LCD screen and can be remotely controlled through a PC-side host computer. This test system is mainly used for leakage current testing of high-voltage capacitors. It can quickly and effectively control the charge and discharge of high-voltage capacitors and accurately test leakage current.
[0003] At present, most of the AC and DC withstand voltage testers on the market are mainly used to test some high-voltage transformers, small-capacity electrolytic capacitor test instruments, etc. Relatively speaking, the leakage current test of high-voltage capacitors is relatively rare, and most withstand voltage instruments have large DC ripples and do not have the charge and discharge control of high-voltage large capacitors. After the test is completed, they cannot discharge quickly and effectively. For most of the high-voltage capacitors that have been tested, high voltage electricity may still be stored in the two poles, which can easily cause electric shocks if you are not careful. Utility Model Content
[0004] The utility model aims to provide a program-controlled high-voltage capacitor leakage current test system, which mainly solves the problem that after the existing tester completes the test, the discharge cannot be fast and effective, and it is easy to cause electric shock and injury.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0006] A program-controlled high-voltage capacitor leakage current test system includes a main control board module, a display and key module, a power transformer module, a power amplifier board module, a fast discharge control module, a high-voltage signal sampling module and a PC host computer module, all of which are connected to the main control board module, a high-voltage relay module connected to the fast discharge control module and the high-voltage signal sampling module, a high-voltage transformer module connected to the power amplifier board module, the high-voltage signal sampling module and the high-voltage relay module, and a high-voltage output module connected to the high-voltage relay module; wherein the power transformer module is also connected to the power amplifier board module; the system supplies power to the main control board module and the power amplifier board module through the power transformer module, Different values are set through the display and button modules, and then sent to the main control board module. The main control board module outputs the analog voltage DAC to the power amplifier board module. The power amplifier board module amplifies the signal and then outputs a 0-25V AC signal to the high-voltage transformer module. The high-voltage transformer module then outputs AC 5KV and DC 6KV high-voltage signals to the high-voltage relay module. At this time, the high voltage is output through the high-voltage output module, and then the signal is collected through the high-voltage signal acquisition module and fed back to the main control board module. In addition, after the high-voltage output module outputs the high voltage, it is connected in parallel to the fast discharge control module. Before and after the instrument starts testing, the high-voltage capacitor at the high-voltage output end is charged and discharged. Control.
[0007] Furthermore, in the present invention, the button and display module includes a 7-inch LCD display screen and independent operation buttons, and the LCD display screen and the independent operation buttons are connected to the main control board module via an FPC cable.
[0008] Furthermore, in the utility model, the main control board module includes a single-chip microcomputer chip STM32F429 and a CPLD chip EPM570T144C5N. The two chips communicate through a bus, send instructions to the main control board module through a display and button module or a PC host computer module, and then output DAC signals to the power amplifier board module.
[0009] Furthermore, in the present invention, the power amplifier board module adopts a triode power amplifier circuit, which is mainly used to amplify the DAC signal input by the main control board module and then output it to the next-level high-voltage transformer module.
[0010] Furthermore, in the present invention, the high-voltage transformer module includes a primary input single-way winding AC: 0~25V and a post-stage output double-way winding AC: 2*(0~5KV), which is mainly used to output high voltage to the next-stage high-voltage relay module.
[0011] Furthermore, in the utility model, the high-voltage relay module includes 5KV current limiting and high-voltage AC output, 6KV high-voltage rectification and DC output; it is mainly used to output high voltage to the next-level high-voltage output module and high-voltage signal acquisition module.
[0012] Furthermore, in the utility model, the high-voltage signal acquisition module adopts a 5KV / 6KV high-voltage AC / DC voltage sampling circuit, which is mainly used to realize 0-100mA high-voltage AC / DC current switching control. The signal is returned to the main control board module through a connecting line. The single-chip microcomputer STM32F429 inside the main control board module determines whether the returned data is abnormal according to the parameters set by the user and performs closed-loop adjustment.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] The maximum output of the program-controlled ultra-high voltage AC and DC withstand voltage insulation test system of the utility model can reach AC: 5KVDC: 6KV. The main control board module can form a remote control with the PC host computer, and the test data can be returned to the PC host computer for display. The degree of automation is high, which greatly improves the safety and work efficiency of the entire program-controlled high-voltage capacitor leakage current test system. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is the overall structural principle block diagram of the utility model.
[0016] Figure 2 This is a schematic diagram of the single-chip microcomputer chip structure of the main control board module in the embodiment of the utility model.
[0017] Figure 3 This is a schematic diagram of the CPLD chip structure of the main control board module in the embodiment of the utility model.
[0018] Figure 4 This is a schematic diagram of the power transformer interface of the main control board module in the embodiment of the utility model.
[0019] Figure 5 This is a schematic diagram of the circuit structure of the main control board module in the embodiment of the utility model, which rectifies and steps down the AC 9V voltage to DC 5V and DC 3.3V.
[0020] Figure 6 This is a schematic diagram of the structure of the main control board module in the embodiment of the utility model, wherein the AC 18.5V is rectified and stepped down to DC+15V and DC-15V.
[0021] Figure 7 This is a schematic diagram of the structure of rectifying and stepping down the AC 18.5V voltage of the main control board module to DC+24V in the embodiment of the utility model.
[0022] Figure 8 This is a schematic diagram of the SPI FLASH module of the main control board module in the embodiment of the utility model.
[0023] Fig. 9This is a schematic diagram of the EEPROM module of the main control board module in the embodiment of the utility model.
[0024] Fig.10 This is a schematic diagram of the display screen and key interface module of the main control board module in the embodiment of the present utility model.
[0025] Fig.11 This is a schematic diagram of the RS232 circuit of the main control board module in the embodiment of the present utility model.
[0026] Fig.12 This is a schematic diagram of the DAC output circuit of the main control board module in an embodiment of the present utility model.
[0027] Fig.13 This is a schematic diagram of the power amplifier power supply rectification and filtering circuit of the power amplifier board module in the embodiment of the utility model.
[0028] Fig.14 This is a schematic diagram of a triode power amplifier circuit of a power amplifier board module in an embodiment of the utility model.
[0029] Fig.15 This is a schematic diagram of the AC voltage sampling and DC voltage sampling circuits of the high-voltage relay board module in the embodiment of the utility model.
[0030] Fig.16 This is a schematic diagram of the current gear switching circuit of the high-voltage relay board module in the embodiment of the utility model.
[0031] Fig.17 This is a schematic diagram of a current detection signal amplifying circuit of a high voltage relay board module in an embodiment of the utility model.
[0032] Fig.18 This is a schematic diagram of the relay drive circuit of the high-voltage relay board module in the embodiment of the utility model.
[0033] Fig.19 This is a schematic diagram of the optocoupler isolation circuit of the power amplifier board module in the embodiment of the utility model.
[0034] Fig. 20 This is a schematic diagram of the discharge resistor discharge circuit of the power amplifier board module in the embodiment of the utility model.
[0035] Fig.21 This is a schematic diagram of a 24V to 5V isolated power supply module of the power amplifier board module in the embodiment of the utility model.
[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments. Example
[0037] like Figure 1As shown, the utility model discloses a program-controlled high-voltage capacitor leakage current test system, including a main control board module, a display and key module, a power transformer module, a power amplifier board module, a fast discharge control module, a high-voltage signal sampling module and a PC host computer module, which are all connected to the main control board module, a high-voltage relay module connected to the fast discharge control module and the high-voltage signal sampling module, a high-voltage transformer module connected to the power amplifier board module, the high-voltage signal sampling module, and the high-voltage relay module, and a high-voltage output module connected to the high-voltage relay module; wherein the power transformer module is also connected to the power amplifier board module; the system supplies the main control board module and the power amplifier board module with the power transformer module. The power supply is supplied, different values are set through the display and button module, and then sent to the main control board module. The main control board module outputs the analog voltage DAC to the power amplifier board module. The power amplifier board module amplifies the signal and then outputs the 0-25V AC signal to the high-voltage transformer module. The high-voltage transformer module then outputs AC 5KV and DC 6KV high-voltage signals to the high-voltage relay module. At this time, the high voltage is output through the high-voltage output module, and then the signal is collected through the high-voltage signal acquisition module and fed back to the main control board module. In addition, after the high-voltage output module outputs the high voltage, it is connected in parallel to the fast discharge control module. Before and after the instrument starts testing, the high-voltage capacitor at the high-voltage output end is charged and discharged. Control.
[0038] In this embodiment, the button and display module includes a 7-inch LCD display and independent operation buttons, and the LCD display and the independent operation buttons are connected to the main control board module through FPC cables. The independent operation buttons use a single-chip microcomputer model STM32F103RBT6, which is packaged as LQFP64. The IO pins of the single-chip microcomputer drive 8 LEDs, namely: TEST, SETUP, SYS, FILE, PASS, LOCK, HV, FAIL. In addition, the independent function buttons are: digital buttons 0 to 9, function buttons, ESC, ENTER, FILE, SETUP, F1, F2, F3, F4, F5, LOCK, TEST, BACK. The single-chip microcomputer STM32F103RBT6 is connected to the KEY terminal of the main control board module through the P1 interface for serial port communication.
[0039] In this embodiment, the main control board module includes a single-chip microcomputer chip STM32F429 and a CPLD chip EPM570T144C5N. The two chips communicate via a bus, and send instructions to the main control board module through the display and key module or the PC host module, and then output DAC signals to the power amplifier board module. Figures 2 to 12As shown, the main control board module is input through the AC power supply of JH1, rectified by the rectifier bridge KBP306 to become DC, and then stepped down to 3.3V+ power supply to the single-chip microcomputer STM32F429 chip, 15V+ and 15V- power supply to the op amp circuit, and 24V+ power supply to the relays K1~K7. U74 is an SPI serial communication storage chip W25Q64, which is used to store and export test data. U71 is an I2C serial communication storage chip 24C64, which is used to store set data or data calibrated before the instrument leaves the factory. U10 is an RS232 communication chip SP3232, which is used to communicate with the host computer on the PC side. U1 is a single-chip microcomputer STM32F429, and the main program control logic needs to be processed by the single-chip microcomputer U1. U2 is a CPLD, model EPM570T144C5N, which mainly processes the start and stop signals, and outputs the sine wave to the power amplifier module U82 through the chip D10 and DAC0800. The microcontroller U1 and CPLD U2 mainly communicate through SPI serial communication.
[0040] In this embodiment, the power amplifier board module adopts a triode power amplifier circuit, which is mainly used to amplify the DAC signal input by the main control board module and then output it to the next-level high-voltage transformer module. Fig.13 , 14 As shown, the transistor power amplifier circuit is equipped with an operational amplifier chip U82, OP07C receives the sine wave signal from the chip D10 and DAC0800, and then passes through U15 and OP07C for secondary amplification and negative feedback processing. Transistors Q4C2235 and Q6 A965 are the front-stage driving pair of the power amplifier circuit, which drive the rear-stage transistors Q5, Q8, Q9, Q10, Q11, Q13, Q14, Q15, Q16, and Q17 through the front-stage driving. The transistor model is: C5198. The signal after current amplification is output to the terminal JOUT1, and then connected to the primary input end of the high-voltage transformer T1.
[0041] In this embodiment, the high-voltage transformer module includes a primary input single-way winding AC: 0~25V and a secondary output double-way winding AC: 2*(0~5KV), which is mainly used to output high voltage voltage to the next-level high-voltage relay module. The ratio of the primary to the secondary of the transformer is 1:200. The input is a single winding 0~25V, and the output is a single winding 5KV.
[0042] In this embodiment, the high-voltage relay module includes 5KV current limiting and high-voltage AC output, 6KV high-voltage rectification and DC output; it is mainly used to output high voltage to the next-level high-voltage output module and high-voltage signal acquisition module. Figure 15 to Figure 18As shown, high-voltage resistors R103, R289, R290, R295, R296, R294, and R297 are installed and filled with sealant to prevent the ultra-high voltage from being ionized with the outside air and to prevent interference with other peripheral circuit components.
[0043] In this embodiment, the high-voltage signal acquisition module adopts a 5KV / 6KV high-voltage AC / DC voltage sampling circuit, which is mainly used to realize 0-100mA high-voltage AC / DC current switching control. The signal is returned to the main control board module through the connecting line. The STM32F429 microcontroller inside the main control board module determines whether the returned data is abnormal according to the parameters set by the user and performs closed-loop adjustment. Fig.15 As shown, the voltage is divided by resistors R290 and R291, and then amplified, rectified and filtered by op amps U25, U26, and U27 to output signal AC-ADV1. Secondly, the voltage is divided by resistors R297 and R298, and then amplified, rectified and filtered by op amps U76, U77, and U78 to output signal AC-ADV2. Secondly, the current gear is switched and controlled by relays K2~K7, and the signal is processed by chips U79, U80, U81, U20, and U18 to become a DC signal ADI. These three signals: AC-ADV1, AC-ADV2, and ADI are analog signals and are connected to pins 14, 15, and 13 of the main control board microcontroller U1.
[0044] like Figure 19 to Figure 21 As shown, in this embodiment, the fast discharge control module can control the high-voltage relays RL1, RL3, RL4 in the optocoupler isolation circuit, the isolated optocoupler U83 in the discharge resistor discharge circuit, and then control the high-voltage capacitor discharge resistors R5, R6, R8, R9, R10, R11, R12, R324, R19 through the socket CN3. After the test is completed, the discharge resistor of the module is started to quickly discharge the high-voltage capacitor. Here, the isolated optocouplers U85, U86, U87, U89, U9 of the circuit module control the high-voltage MOS tube of the rear stage: 2SK1316A, corresponding to the position numbers Q18, Q19, Q20, Q21, Q22, Q2, and connect multiple TVS tubes in series: P6KE550CA, position numbers D43 to D60. The function is to reduce the DC ripple output during the test and the rapid discharge after the test to protect the high-voltage capacitor from reverse breakdown.
[0045] Through the above design, the maximum output of the program-controlled ultra-high voltage AC and DC withstand voltage insulation test system of the utility model can reach AC: 5KV DC: 6KV, the main control board module can be remotely controlled with the PC host computer, and the test data can be returned to the PC host computer for display. The degree of automation is high, which greatly improves the safety and work efficiency of the entire program-controlled high-voltage capacitor leakage current test system.
[0046] The above embodiment is only one of the preferred implementation modes of the present utility model and should not be used to limit the protection scope of the present utility model. Any changes or modifications that are made to the main design concept and spirit of the present utility model without any substantive significance, as long as the technical problems solved are still consistent with the present utility model, should be included in the protection scope of the present utility model.
Claims
1. A program-controlled high-voltage capacitor leakage current test system, characterized in that: The system comprises a main control board module, a display and button module, a power transformer module, a power amplifier board module, a fast discharge control module, a high-voltage signal sampling module and a PC host computer module, which are all connected to the main control board module, a high-voltage relay module connected to the fast discharge control module and the high-voltage signal sampling module, a high-voltage transformer module connected to the power amplifier board module, the high-voltage signal sampling module and the high-voltage relay module, and a high-voltage output module connected to the high-voltage relay module; wherein the power transformer module is also connected to the power amplifier board module; the system supplies power to the main control board module and the power amplifier board module through the power transformer module, and sets Different values are set and then sent to the main control board module. The main control board module outputs analog voltage DAC to the power amplifier board module. The power amplifier board module amplifies the signal and then outputs 0-25V AC signal to the high-voltage transformer module. The high-voltage transformer module then outputs AC 5KV and DC 6KV high-voltage signals to the high-voltage relay module. At this time, the high voltage is output through the high-voltage output module, and then the signal is collected through the high-voltage signal acquisition module and fed back to the main control board module. In addition, after the high-voltage output module outputs high voltage, it is connected in parallel to the fast discharge control module. Before and after the instrument starts testing, the high-voltage capacitor at the high-voltage output end is charged and discharged. Control.
2. A program-controlled high-voltage capacitor leakage current test system according to claim 1, characterized in that: The button and display module includes a 7-inch LCD display screen and independent operation buttons, and the LCD display screen and the independent operation buttons are connected to the main control board module through an FPC cable.
3. A program-controlled high-voltage capacitor leakage current test system according to claim 2, characterized in that: The main control board module includes a single-chip microcomputer chip STM32F429 and a CPLD chip EPM570T144C5N. The two chips communicate through a bus, send instructions to the main control board module through a display and key module or a PC host computer module, and then output DAC signals to the power amplifier board module.
4. A program-controlled high-voltage capacitor leakage current test system according to claim 3, characterized in that: The power amplifier board module adopts a triode power amplifier circuit, which is mainly used to amplify the DAC signal input by the main control board module and then output it to the next-level high-voltage transformer module.
5. A program-controlled high-voltage capacitor leakage current test system according to claim 4, characterized in that: The high-voltage transformer module includes a primary input single-way winding AC: 0~25V and a post-stage output double-way winding AC: 2*(0~5KV), which is mainly used to output high voltage to the next-stage high-voltage relay module.
6. A program-controlled high-voltage capacitor leakage current test system according to claim 5, characterized in that: The high-voltage relay module includes 5KV current limiting and high-voltage AC output, 6KV high-voltage rectification and DC output; it is mainly used to output high voltage to the next-level high-voltage output module and high-voltage signal acquisition module.
7. A program-controlled high-voltage capacitor leakage current test system according to claim 6, characterized in that: The high-voltage signal acquisition module adopts a 5KV / 6KV high-voltage AC / DC voltage sampling circuit, which is mainly used to realize 0-100mA high-voltage AC / DC current switching control. The signal is returned to the main control board module through a connecting line. The STM32F429 microcontroller inside the main control board module determines whether the returned data is abnormal according to the parameters set by the user and performs closed-loop adjustment.