A kind of igbt drive protection circuit

Abstract

The invention discloses an IGBT driving protection circuit which comprises an input terminal, an upper tube short pulse suppression circuit, an upper tube first-order circuit, an upper tube dead zone delay circuit, an upper tube clamping protection circuit, a lower tube short pulse suppression circuit, a lower tube first-order circuit, a lower tube dead zone delay circuit and a lower tube clamping protection circuit. The input terminal, the upper tube short pulse suppression circuit, the upper tube first-order circuit, the upper tube dead zone delay circuit and the upper tube clamping protection circuit are arranged between the input terminal and an output terminal, used for controlling an upper tube IGBT, and connected in sequence; the lower tube short pulse suppression circuit, the lower tube first-order circuit, the lower tube dead zone delay circuit and the lower tube dead zone delay circuit are used for controlling a lower tube IGBT and connected in sequence. By means of the IGBT driving protection circuit, a simple hardware circuit structure is adopted, short pulses are suppressed, upper tube dead zone delay control and lower tube dead zone delay control of the IGBTs are achieved, the diode clamping protection circuits are adopted for resisting interference, cost is low, and reliability is high.

Description

technical field [0001] The invention relates to a converter, in particular to an IGBT drive protection circuit for an internal power unit of the converter. Background technique [0002] When the converter is working, the upper IGBT and the lower IGBT on the same bridge arm inside the power unit cannot be turned on at the same time when driving, and when the upper and lower IGBTs are switched alternately, one IGBT is turned on and the other is turned off within the time There must be a certain dead zone delay. [0003] At present, the solutions to the above-mentioned dead zone delay problem are as follows: 1. Use a dedicated integrated driver, but this kind of dedicated integrated driver has high price, long delivery period, and poor maintainability; 2. Use software control, but the software control has poor anti-interference performance. The IGBT is easily damaged after the software runs away or crashes. Contents of the invention [0004] In order to solve the above tech...

AI Technical Summary

Problems solved by technology

[0003] At present, the solutions to the above-mentioned dead zone delay problem are as follows: 1. Use a dedicated integrated driver, but this kind of dedicated integrated driver has high price, long delivery period, and poor maintainability; 2. Use software control, but the software control has poor anti-interference performance. The IGBT is easily damaged after the software runs away or crashes

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