IGBT driving circuit of wind power converter

Abstract

The invention discloses an IGBT driving circuit of a wind power converter, which includes a primary-side circuit, an isolation circuit and a secondary-side circuit. The primary-side circuit includes adead zone circuit, an interlock circuit, a protection circuit, a 15V power input filter circuit, and a DC / DC circuit. The isolation circuit includes a transformer isolation circuit and an optical coupler isolation circuit. The secondary-side circuit includes a + / -15V driving power source, a driving circuit, and a Vce-Sat detection circuit. The IGBT driving circuit can effectively protect an IGBTmodule, and the primary-side circuit is integrated with the dead zone circuit, the interlock circuit and the protection circuit so as to improve anti-interference ability and the reliability of the driving circuit.

Description

technical field [0001] The invention relates to the technical field of drive circuits, in particular to an IGBT drive circuit for a wind power converter. Background technique [0002] The system voltage of the wind power converter is 690V, and the IGBT module of 1700V is generally used. The switching speed of the high-power IGBT module is fast, which generates high di / dt and du / dt, which brings EMC electromagnetic interference problems and affects the reliable operation of the converter. Even damage the IGBT module, in order to improve the anti-interference ability, there are the following two solutions: [0003] 1) Using optical fiber to transmit control signals, the weak signal of the control circuit and the strong signal of the IGBT module are completely electrically isolated, with strong anti-interference ability and high reliability, but the cost of optical fiber is expensive; [0004] 2) Usually use a dedicated driver and driver chip, such as the wind power dedicated ...

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Problems solved by technology

[0005] Although the above two solutions solve the EMC anti-interference problem of the wind power converter, the cost is relatively high. The more economical solution is to use an optocoupler to achieve electrical isolation, but the primary side of the optocoupler generally uses a low-voltage circuit (15V or 5V ), susceptible to interference

[0006] In addition, the high-power IGBT module generates high di / dt and du / dt during operation, which will cause false triggering of the gates of the upper and lower tubes of the IGBT module, resulting in a direct connection between the upper and lower tubes of the IGBT module, resulting in short-circuit current. If it is not protected in time, it will cause The IGBT module is damaged, seriously affecting the normal operation of the converter

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