A device for testing the temperature of high-voltage power electronic equipment

Abstract

The invention discloses a device used for measuring temperature of high voltage power electronic equipment. The device includes a temperature sensing unit, a two-group double-core shielding twisted-pair, a follow-up processing circuit, a single-group double-core shielding twisted-pair and a data collector. The temperature sensing unit is provided with four wiring terminals T1, T2, T3 and T4. The four wiring terminals are connected to the follow-up processing circuit via the two-group double-core shielding twisted-pair. The follow-up processing unit includes a constant current source excitation circuit connected with the two-group double-core shielding twisted-pair; a primary follow-up processing circuit, an isolation circuit and a voltage / current converting circuit connected between the two-group double-core shielding twisted-pair and the single-group double-core shielding twisted-pair in sequence; and a secondary follow-up processing circuit connected to the output terminal of the single-group double-core shielding twisted-pair. The data collector is connected to the output terminal of the secondary follow-up processing circuit. According to the invention, a multi-stage filter circuit is arranged in the temperature measuring device, so that the anti-interference capability of a temperature measuring system working in a strong electromagnetic environment is enhanced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a device for testing the temperature of high-voltage power electronics equipment. Background technique [0002] At present, power electronics technology has developed to a very high level of technology, high-voltage and high-power power electronic devices, such as 8000V level phase-controlled thyristor (SCR), 5000V level IGBT (insulated gate bipolar transistor), 7000V IGCT (integrated gate Commutation thyristors) have come out one after another, which has greatly promoted the development of power electronic devices in the direction of high voltage, high current, full digitalization, and modularization. [0003] Because power electronic devices will generate heat when they work, it will increase their own operating temperature, and if the temperature of the device is too high, it will shorten its service life, or even burn the device, which greatly reduce...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the defects of the prior art, the purpose of the present invention is to provide a device for testing the temperature of high-voltage power electronic equipment, which aims to solve the problem that the long-distance transmission of the temperature measuring device in high-voltage power electronic equipment is susceptible to strong electromagnetic interference

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