Inversion driving circuit for IGBT (insulated gate bipolar transistor) induction heating power source

Abstract

The invention belongs to the electrical technical field and provides an inversion driving circuit for an IGBT (insulated gate bipolar transistor) induction heating power source. The inversion driving circuit for the induction heating power source comprises a pulse signal receiving and conditioning circuit (2), an isolating circuit (3) and a current amplifier (4). The pulse signal receiving and conditioning circuit (2) is communicated with an external circuit through optical fibers. The isolating circuit (3) is communicated with the pulse signal receiving and conditioning circuit (2). The current amplifier (4) is communicated with the isolating circuit (3). The inversion driving circuit further comprises an overvoltage protection and du / dt protection circuit (6), a transient suppression circuit (5) and an alarm output circuit (7). By means of the inversion driving circuit for the induction heating power source, quality of driving pulse signals is guaranteed while coupled signals returned from the direction of the IGBT are prevented from interfering operation of the driving circuit; and operational reliability of the IGBT is guaranteed while damage of IGBT devices can be effectively avoided.

Description

technical field [0001] The invention belongs to the field of electrical technology, and relates to a driving technology of an inverter of an induction heating power supply, in particular to an inverter driving circuit of an IGBT induction heating power supply. Background technique [0002] At present, induction heating is widely used in smelting, diathermy, quenching and other fields due to its advantages of high heating efficiency, fast temperature rise, and good controllability. The induction heating power supply is one of its key equipment; in the main circuit of the induction heating power supply , it is necessary to generate alternating current through the inverter circuit. According to different heating production processes, the inverter circuit needs to generate an alternating circuit with adjustable frequency and power control. At present, the devices used in the inverter circuit mainly include SCR, IGBT, MOSFET, etc. . Among them, IGBT has been widely used due to i...

AI Technical Summary

Problems solved by technology

Among them, IGBT has been widely used due to its advantages of small size, high reliability, low noise, high efficiency, and fast response; but compared with traditional SCR devices, IGBT's anti-overload ability is relatively poor.

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