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IGBT drive circuit, and electromagnetic induction heating device and method

A driving circuit and current technology, applied in the field of IGBT driving circuit and electromagnetic induction heating equipment, can solve the problems of large short-circuit current, burning out IGBT, IGBT service life influence, etc., to improve service life, ensure normal operation, and effectively protect Effect

Active Publication Date: 2014-03-26
MIDEA GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing electromagnetic induction heating equipment, the IGBT is generally turned on by giving a fixed turn-on signal to the IGBT. However, since the input voltage of the electromagnetic induction heating equipment is generally relatively high, it will generate a lot of noise when the IGBT is turned on for the first time. Large short-circuit current, so that the current flowing through the IGBT is very large, and it will last for a long time under a fixed turn-on signal, which will affect the service life of the IGBT, and even burn the IGBT directly, so that the electromagnetic induction heating equipment cannot normal work

Method used

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  • IGBT drive circuit, and electromagnetic induction heating device and method
  • IGBT drive circuit, and electromagnetic induction heating device and method
  • IGBT drive circuit, and electromagnetic induction heating device and method

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Embodiment I

[0026] The working principle of the IGBT drive circuit of the preferred embodiment of the present invention is specifically described as follows:

[0027] refer to figure 2 and image 3 shown, figure 2 is the corresponding schematic diagram of the magnitude of the collector current of the IGBT and the plurality of first turn-on signals in the IGBT drive circuit of the preferred embodiment of the present invention; image 3 It is a schematic diagram of the voltage change on the filter capacitor C in the IGBT drive circuit according to the preferred embodiment of the present invention.

[0028] In this embodiment, before the IGBT is turned on, the DC power input through the DC input terminal 13 charges the filter capacitor C, the voltage across the filter capacitor C increases continuously, and the control module 2 outputs a plurality of first turn-on signals to the IGBT at intervals, Since the turn-on times of the plurality of first turn-on signals are arranged in ascendin...

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Abstract

The invention discloses an IGBT drive circuit, and an electromagnetic induction heating device and method. The IGBT drive circuit comprises an operating module. The operating module comprises an IGBT. The IGBT drive circuit further comprises a control module. The control module is used for alternately outputting a plurality of first on signals to the IGBT before current of the IGBT is smaller than a preset value, and alternately outputting second on signals with fixed on time to the IGBT after the current of the IGBT is smaller than the preset value. On time of the first on signals is smaller than that of the second signals. Burnout of the IGBT caused by high short-circuit current flowing by the IGBT can be avoided, and thus the IGBT is reliably and effectively protected, the service life of the IGBT is prolonged and normal operation of the IGBT is ensured.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an IGBT drive circuit, an electromagnetic induction heating device and a method thereof. Background technique [0002] IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) is a common electronic device in control circuits. In the existing electromagnetic induction heating equipment, the IGBT is generally turned on by giving the IGBT a fixed turn-on signal. However, since the input terminal voltage in the electromagnetic induction heating equipment is generally relatively high, a large amount of electricity is generated when the IGBT is turned on for the first time. Large short-circuit current, so that the current flowing through the IGBT is very large, and it will last for a long time under a fixed turn-on signal, which will affect the service life of the IGBT, and even directly burn the IGBT, so that the electromagnetic induction heating equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/06
Inventor 李信合杨立萍黄庶锋黄开平麻百忠雷俊董远张永亮乔维君袁宏斌杨乐房振黄兵
Owner MIDEA GRP CO LTD
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