ABB SD821 Power Supply Device

ABB SD821 Power Supply Device

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In a parallel circuit the paralleled IGBTs should switch on and off simultaneously. Non-simultaneous switching will also result in dynamic current asymmetry. To assure simultaneous switching one IGBT-driver channel can drive all paralleled IGBTs. 

Paralleled IGBTs may also be driven via separate driver channels. This has the disadvantage of transition time differences in the signal coupling path and has the advantage that equalising processes via auxiliary collector and auxiliary emitter will not occur. The more cost effective option is to control all paralleled IGBTs with one driver channel. 

It is important that each IGBT is provided with its own gate resistor and clamping diode between gate and emitter. This is to be located as closely to the IGBT module as possible. The collectors of the top switches are to be decoupled with resistors. The value of these collector resistors should be chosen as low as possible. 

ABB SD821 Technical drawing:

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