Test system of high voltage frequency converter

A high-voltage frequency converter and testing system technology, applied in the testing field, can solve the problems of insufficient power unit protection, increased safety detection, energy consumption, etc., to achieve the effects of improving testing efficiency, improving testing efficiency, and reducing energy consumption

Inactive Publication Date: 2009-12-09
SHANGHAI STEP ELECTRIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, although the test method of directly adopting a small prototype uses a 380V low-voltage input, it is still difficult to ensure the safety of the system and the safety of the surrounding personnel, especially in the PWM (Pulse Width Modulation, pulse width modulation) control algorithm, etc. There are serious defects, and In the case of insufficient power unit protection, explosions caused by short circuit, overvoltage, overheating and other faults are prone to occur; at the same time, because R&D and test personnel want to avoid such serious consequences, they have to increase many links such as safety inspection, operation and even approval. Affects test efficiency; in addition, even if there are no serious consequences, a lot of energy will be consumed due to repeated startup of the system and long-term work

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Such as figure 2 As shown, the present embodiment realizes the functions of the PWM detection module and the data processing module simultaneously by selecting a high-performance FPGA chip (the A3P030 type of the ProASIC3 series), and selects an industrial computer or an embedded system device with a display screen to realize the man-machine interface module. Function, choose DA conversion chip to realize the function of DA output interface. The FPGA chip detects the PWM wave output by the high-voltage inverter in real time and at high speed, and determines the superimposed value of each phase. The principle is the conduction relationship of the IGBT. Taking the PWM wave in the (3) stage as an example, the rules for detecting the PWM wave are shown in Table 2:

[0044] The PWM detection result of the (3) stage of Table 2

[0045] PWM_L

[0046] Therefore, if it is a five-cascade high-voltage inverter, through the PWM detection of each cascade, and then superi...

Embodiment 2

[0048] Such as image 3 As shown, this embodiment realizes the functions of the PWM detection module, the data processing module and the DA output interface by selecting an MCU chip (STM32F103RD type) with a DA output interface at the same time, and selects an industrial computer to realize the function of the man-machine interface module. The MCU chip detects the PWM wave output by the high-voltage inverter in real time and at high speed through the IO interrupt, and determines the superimposed value of each phase. The detection principle is the same as that of Embodiment 1; the MCU chip can conveniently calculate the output voltage frequency, effective value, etc. based on the PWM detection results; In addition, the MCU chip outputs the PWM detection results and other values ​​in the form of voltage through the DA output interface, and the tester can read them through the oscilloscope; at the same time, the MCU chip can provide various communication interfaces such as RS232 i...

Embodiment 3

[0050] Such as Figure 4 As shown, this embodiment can combine the characteristics of fast detection signal of FPGA and strong data processing capability of MCU. The FPGA chip uses the A3P030 chip of the ProASIC3 series, which realizes the function of the PWM wave detection module, that is, it is used to be responsible for the PWM wave detection, and the detection results are passed through the parallel port and the I 2 C passes to MCU chip, and detection principle is the same as embodiment 1; 2 The C interface reads the PWM detection results transmitted by the FPGA chip, and calculates the voltage frequency, effective value, average value, etc. in real time; at the same time, the PWM detection results and other values ​​are output in the form of voltage through the DA output interface, and the tester can use the oscilloscope In addition, the MCU chip can provide various communication interfaces such as RS232 interface, SPI interface or CAN interface, and realize communicatio...

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Abstract

The invention discloses a test system of high voltage frequency converter, comprising: a PWM wave detection module, collecting each path of PWM waves of the high voltage frequency converter in real time and determines voltage overlapped at each phrase; a data processing module, calculating voltage frequency, effective value and mean value in real time according to the overlapped voltage; a man-machine interface module, displaying overlapped voltage wave forms and voltage frequency, effective value and mean value in real time; and a peripheral interface module through which the PWM wave detection module, the data processing module and the man-machine interface module are connected with peripheral devices. The invention can directly detect control algorithm and effect of the high voltage frequency converter in the weak current environment to further ensure safety, thereby improving test efficiency and reducing energy consumption.

Description

technical field [0001] The invention relates to a test technology, in particular to a test system for a high-voltage frequency converter. Background technique [0002] In the current process of developing high-voltage inverters, the main test method is to customize a small low-voltage prototype, and then conduct related tests to observe the output voltage and current of the prototype to achieve the purpose of testing. [0003] However, although the test method of directly adopting a small prototype uses a 380V low-voltage input, it is still difficult to ensure the safety of the system and the safety of surrounding personnel, especially in the PWM (Pulse Width Modulation, pulse width modulation) control algorithm, etc. There are serious defects, and In the case of insufficient power unit protection, explosions caused by short circuit, overvoltage, overheating and other faults are prone to occur; at the same time, because R&D and test personnel want to avoid such serious conse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/00G01R19/02
Inventor 李兴鹤时迎亮邢辉吴芸宋吉波谢海峰何杰严昊
Owner SHANGHAI STEP ELECTRIC
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