Control of ac power for inductive loads

Details Control of ac power for inductive loads Control of ac power for inductive loads

G - Physics

05

F

323/4, 323/9

G05F 1/445 (2006.01)

Patent

CA 1257901

CONTROL OF AC POWER TO INDUCTIVE LOADS Abstract of the Disclosure A control system is provided for controlling the average power from an alternating voltage source (AC) to a load having inductive properties. The system uses a synchronous switch shunted by a capacitor connected between the source (generator) and sink (load) to pulse duration modulate the AC voltage carrier wave. A control signal generator circuit drives the synchronous switch such that the switch is closed at a variable time early in each half-wave of the AC voltage source carrier wave and such that the switch is opened at a subsequent later, variable time during that half-wave. This is accomplished by sensing the voltage across the synchronous switch in order to inhibit closing of the switch early in the half-wave until the synchronous switch voltage (and thus the voltage on the capacitor) is substantially zero and then opening the synchronous switch at a point in time to give the desired volt-second area between closure and opening within each half-wave.

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