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IGBT short-circuit protection circuit in frequency converter and method thereof

A short-circuit protection circuit and inverter technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of high price and increased cost, and achieve the effects of timely response, cost reduction, and simple circuit structure

Inactive Publication Date: 2010-10-20
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, IGBT special drivers such as EXB841 are commonly used, and the price is high, which increases the cost in the production and application of small and medium power

Method used

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  • IGBT short-circuit protection circuit in frequency converter and method thereof
  • IGBT short-circuit protection circuit in frequency converter and method thereof
  • IGBT short-circuit protection circuit in frequency converter and method thereof

Examples

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings. Such as Figure 1-3 As shown, an IGBT short-circuit protection circuit in a frequency converter includes a delay circuit 1, an isolation amplifier circuit 2, a comparison circuit 3 and a drive circuit 4, and the input end of the delay circuit 1 is connected to the switching signal of the IGBT5, and the output end is sequentially Connect with isolation amplifier circuit 2, comparison circuit 3, drive circuit 4 and IGBT5, described comparison circuit 3 also has an input end connected with an output signal end of IGBT5; Described delay circuit 1 is composed of an RC circuit and an Composed of comparator IC1, the input end of the RC circuit is connected to the switching signal of IGBT5, and the output end of comparator IC1 is connected to the isolation amplifier circuit 2; the isolation amplifier circuit 2 adopts the chip TLP250, and the 2-pin end of the chip TLP250 is the i...

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PUM

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Abstract

The invention discloses an IGBT (insulated gate bipolar transistor) short-circuit protection circuit in a frequency converter and a method thereof. The circuit comprises a time-delay circuit, an isolating amplifier circuit, a comparison circuit and a drive circuit, wherein the input terminal of the time-delay circuit is connected with the switching signal of the IGBT, and the output terminal of the time-delay circuit is sequentially connected with the isolating amplifier circuit and the comparison circuit; and the drive circuit adopts an IR2110 driving chip with the SD input terminal thereof being connected to the output terminal of the comparison circuit and the output terminal thereof being connected to the IGBT. The method comprises the steps of time delay, isolation amplification, comparison and driving, wherein the IGBT is switched on and off by using the IR2110 driving chip of the drive circuit. By externally connecting the simple time-delay circuit, the isolating amplifier circuit chip and the typical comparison circuit to the SD input terminal, the invention can achieve the short-circuit protection for the IGBT, ensure that the circuit structure is simple and the response is timely and reliable and greatly reduce the cost.

Description

technical field [0001] The invention relates to the technical field of IGBT short-circuit protection, in particular to an IGBT short-circuit protection circuit in a frequency converter main circuit and a method thereof. Background technique [0002] The purpose of the IGBT short-circuit protection in the main circuit of the inverter is to turn off the IGBT within the short-circuit time that the IGBT is allowed to withstand after detecting a short-circuit, so as to ensure the safe operation of the IGBT. The methods that can be adopted are: to detect the voltage U between the collector and the emitter during short circuit CE Increase the short circuit protection, use the current transformer to detect the IGBT overcurrent to realize the short circuit protection, use the voltage U between the collector and the emitter when the IGBT is short circuited CE The principle of increasing and the overcurrent detection of the current transformer are integrated to realize short-circuit p...

Claims

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Application Information

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IPC IPC(8): H02H7/10
Inventor 王丹李婷婷彭周华胡晓静
Owner DALIAN MARITIME UNIVERSITY
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