Auxiliary commutation circuit for an inverter

Details Auxiliary commutation circuit for an inverter Auxiliary commutation circuit for an inverter

H - Electricity

02

M

321/49

H02M 7/525 (2006.01) H02M 7/48 (2006.01)

Patent

CA 1133580

- 1 - ABSTRACT OF THE DISCLOSURE An auxiliary commutation circuit for an inverter comprises a pair of oppositely charged capacitors con- trolled by separate switches, each operable at a particu- lar time during the conduction cycle of the main thyris- tors to provide additional stored energy for commutation during overcurrent conditions. A current detector senses the load current and provides a signal to an auxiliary gate whenever the rate of change in the load current or its absolute magnitude exceeds a preselected value. In response to the overcurrent signal and a timing signal, the auxiliary gate renders the appropriate switch opera- tive coupling the charged auxiliary capacitor in parallel with the primary commutation capacitor so that the com- bined electrical energy stored on both capacitors is available for commutation. After the commutation period the auxiliary gate maintains the switch in its open state for a sufficient period of time to allow the auxiliary capacitor to be recharged.

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