Selective commutation for an inverter

Details Selective commutation for an inverter Selective commutation for an inverter

H - Electricity

02

M

321/42

H02M 7/155 (2006.01) H02M 7/527 (2006.01)

Patent

CA 1177535

-16- Selective Commutation Circuit For An Inverter Abstract A selective commutation technique used with an inverter eliminates one of the two commutation pulses at those points at which there is a particular rela- tionship of inverter operating characteristics. If the power factor angle .theta., the voltage phase angle .delta., and the voltage pattern notch angle .beta. are sensed to determine this particular relationship. Because at the switching point there is no current flowing through the conducting thyristor, the conducting thyristor can then be transitioned to the noncon- ducting state merely by the removal of its gate signal. A single makeup pulse is then rung through the system to initialize the commutation capacitors for the next switch point.

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