Insulated Gate Bipolar Transistor (IGBT) driver interlock circuit with power-on time delay function

Abstract

The invention discloses an IGBT driver interlock circuit with a power-on time delay function, including a time delay circuit module 1, an NAND logic circuit module, a plurality of resistors 3s, an inverting drive 4 which are successively connected; the NAND logic circuit module includes a plurality of NAND logic circuit groups composed of an upper pipe and a lower pipe. According to the invention, a drive signal which is sent by a Digital Signal Processor (DSP) chip is subject to a certain time delay, and then is output to a drive board for driving an IGBT module so as to enable the IGBT to have a reliable turn-off within the time period. The circuit is also provided with an interlock circuit, and constitutes a logic relationship with an NAND gate chip such that once one signal turns to be a high level signal, another signal will be a low level signal,thereby guaranteeing the upper and lower pipes of the IGBT are not powered on at the same time and preventing short circuit breakdown of the IGBT. The IGBT driver interlock circuit with the power-on time delay function precludes the short circuit breakdown of the IGBT, effectively protects the bridge arm of the IGBT, and increases the reliability of the IGBT driver circuit.

Description

technical field [0001] The invention relates to a drive circuit, in particular to an IGBT drive interlock circuit with a power-on delay function. Background technique [0002] Insulated gate bipolar transistor (InsulatedGateBipolarTransistor, referred to as IGBT), which integrates the advantages of bipolar power transistor and power MOSFET, has the advantages of voltage control, large input impedance, low driving power, simple control circuit, small switching loss, and fast on-off speed. With the advantages of high speed and high operating frequency, it has been widely used in the fields of converters, frequency converters, switching power supplies, etc., and its role is particularly significant in high-power circuits. Therefore, the driving circuit of the IGBT is a key link in the operation of the entire device. [0003] Since the topology circuit composed of IGBTs often exists in the form of bridge arms, its driving circuit must prevent the occurrence of short-circuit and...

AI Technical Summary

Problems solved by technology

At present, the existing IGBT drive circuit has the problem that the initial power-on is unstable, which causes the output impact level of the drive module to affect the IGBT switch.

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