Ac inverter with constant power output

H - Electricity – 02 – M

Patent

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323/28, 321/59

H02M 7/42 (2006.01) H05B 41/288 (2006.01) H02M 7/538 (2006.01) H02M 7/5387 (2006.01)

Patent

CA 1070763

ABSTRACT OF THE DISCLOSURE A constant voltage square wave inverter drives a load connected as the damping element in an otherwise high Q, resonant matching circuit. The frequency of the inventer is maintained near the resonant frequency of the load circuit to provide substantially constant load power. The frequency of the inverter operation may be main- tained near load circuit resonance by forcing commutation of the square wave output voltage as the rate of change of load current is substantially zero. The inverter output voltage may also be commutated as the peak current reaches a predetermined reference value to stabilize inverter operation for loads which cannot accept real power.

272285

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