Auxiliary commutation circuit for an inverter

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

1978-12-26

1980-05-20

Shoop, William M.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 57, 363 96, 363139, H02M 7515

Patent

active

042042682

ABSTRACT:
An auxiliary commutation circuit to compensate for transient type overload conditions of an inverter comprises a pair of oppositely charged capacitors controlled by separate switches, each operable at a particular time during the conduction cycle of the main thyristors 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 operative coupling the charged auxiliary capacitor in parallel with the primary commutation capacitor so that the combined 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.

REFERENCES:
patent: 3249844 (1966-05-01), Jensen

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