Patent ID: 6346778
Filing Date: 2002-02-12
Classification: H02M,H05B

Abstract:
An AC-AC power converter including:input means for receiving supply power; switch means electronically connected to the input means, The switch means for providing control of power delivered to an output load; control means electronically connected to the switch means, the control means for controlling the operation of the switch means; and a first sensing circuit for providing a first signal indicative of voltage input to the converter; a second sensing circuit for providing a second signal indicative of input current To the converter; detecting means, responsive to the sensing circuits, to detect a difference in polarity between the first and second signals; wherein the switch means is operable to switch between a first and a second state, the first state being â€˜onâ€™ and the second state being â€˜offâ€™, and wherein the control means causes the switch means, which is for providing control of power delivered to an output load, to be in the first state responsive to the detecting means detecting a difference in polarity, thereby dissipating a residual energy in the power converter.