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Inverter self-test system

A technology of self-inspection system and frequency converter, which is applied in the field of frequency converter detection, can solve problems such as safety accidents, and achieve the effect of protecting system circuits

Active Publication Date: 2021-11-19
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the IGBT in the frequency converter of the prior art is damaged and cause a safety accident during operation. The present invention proposes a self-inspection system for the frequency converter

Method used

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  • Inverter self-test system
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  • Inverter self-test system

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Embodiment Construction

[0028] Such as figure 1 As shown, the frequency converter self-inspection system in the embodiment of the present invention is used to detect each IGBT in the two frequency converters located on the grid side and the motor side respectively. figure 1 Among them, the circuit breaker K1 is set in the grid side circuit breaker, and the circuit breaker K2 is set in the busbar. The main control module 1 is used to send out the mode signal mod used to control the working mode of the inverter, the drive signal VG used to control the IGBT on and off of the inverter, and receive the fault feedback signal Warn, and control the circuit breaker K1 according to the fault feedback signal Warn And circuit breaker K2 on and off, so as to protect the frequency converter.

[0029] Such as figure 2 As shown, the frequency converter self-inspection system of the embodiment of the present invention also includes a detection circuit 2 , a detection result feedback module 3 and an overcurrent det...

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Abstract

The invention discloses a frequency converter self-inspection system and a frequency converter, which include: a main control module, a detection circuit, a voltage judgment module and a first XOR logic module, the detection circuit includes a first voltage output terminal, and a second Voltage output terminal; the detection result feedback module includes a detection voltage judgment module and a first XOR logic module, and the voltage judgment module is connected to the first voltage output terminal and the second voltage output terminal respectively, and is used for according to The voltages of the first voltage output terminal and the second voltage output terminal output a corresponding logic level Vout; the first exclusive OR logic module is used to perform exclusive OR on the logic level Vout and the driving signal VG OR operation, and output the fault feedback signal Warn to the main control module. By adopting the technical solution of the invention, self-checking can be performed before the frequency converter, and whether the frequency converter is over-current can be detected after the frequency converter is started.

Description

technical field [0001] The invention relates to the field of frequency converter detection, in particular to a frequency converter self-inspection system. Background technique [0002] At present, photovoltaic inverter products have rectifier modules and inverter modules. With the high efficiency requirements, three-level and five-level photovoltaic inverters are slowly appearing in front of us. As the demand for power modules such as IGBTs is increasing, the safety of modules has been paid more and more attention. At present, photovoltaic inverters, and some other products that use power modules, especially those with high power, lack the self-test function of IGBT modules before actual operation. After long-distance transportation or long-term unstable operation, the modules have been damaged. Direct operation of equipment is likely to cause huge safety accidents; on the other hand, the detection accuracy of IGBT module overcurrent needs to be improved during normal opera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/26G01R31/27H02M5/458
CPCG01R31/2608G01R31/27H02M5/4585
Inventor 徐志国姜颖异黄猛党培育戚宇生陈慢林
Owner GREE ELECTRIC APPLIANCES INC