ABB ACS880-01-11A0-5 Input Voltage Range 208-240 V

ABB ACS880-01-11A0-5 Input Voltage Range 208-240 V

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Cables. 

Active clamping is a technique which keeps transient overvoltages below the critical limits when the IGBT turns-off. The standard approach to active clamping is to use a chain of avalanche diodes connected between the auxiliary collector and the gate of an IGBT module. When the Collector-Emitter voltage exceeds the diodes breakdown voltage the diodes current sums up with the current from the driver output.

Due to the now increased gate-emitter voltage the transistor is held in an active mode and the turning-off process is prolonged. The dIC/dt slows down which results in a limited voltage overshoot. Avalanche diodes conduct high peak currents during the time period in which the clamping is actively limiting the overvoltage. 

A typical turn-off waveform under short circuit condition of a FF600R12ME4 module at room temperature without any overvoltage limiting function is shown in Figure 10a. Under short circuit condition at room temperature with active clamp function a typical waveform is shown in Figure 10b.

ABB ACS880-01-11A0-5 Technical drawing:

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