Two-stage commutation circuit for an inverter

Details Two-stage commutation circuit for an inverter Two-stage commutation circuit for an inverter

H - Electricity

02

M

321/42

H02M 7/515 (2006.01)

Patent

CA 1123049

- 1 - ABSTRACT OF THE DISCLOSURE A two-stage commutation circuit for an inverter, each having a different energy storage capability, commu- tates the main semiconductor switches by creating a commutation pulse suitable for the different levels of load current. This improves overall inverter efficiency by decreasing the circulating commutation current at light loads due to reduced size of the commutation and makeup pulses utilized at the lower load current levels. The control circuit for the dual commutation circuits includes a voltage detector for sensing the level of the DC input voltage and current detectors for sensing the times at which the load current is essentially zero so that the transition between the commutation circuits will occur without perturbations in the cyclic operation of the inverter.

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