Abstract:

The inverter’s actual model was built with the consideration of passive devices’ un-ideal models and the impact of distributed impedance. The causes and potential damages of pulsed current during the switching transition process of the current source inverter bridge in normal operation state was  analyzed in detail. A LCRD bridge protection circuit was presented. Detailed analysis as well as experiments based on this bridge protection topology fully validated that the topology could effectively decrease the pulsed current, current transition rate and voltage transition rate in the switching process, and could also protect  power devices from inappropriate triggers and possible damage. In addition, the parameter selection method was also given for establishing the bridge protection circuit.

Key words: inverter, reverse restoration time, pulsed current, protection circuit topology