Patent ID: 7084584
Filing Date: 2006-08-01
Classification: H02M,H05B,Y02B

Abstract:
1. Apparatus driven by high-frequency AC current source, for driving an electric load with low-frequency AC current, comprising: a) a current splitting inductor, for generating, from said high-frequency current source, a first and a second high-frequency AC current sources; b) a rectifier, coupled to said splitting inductor, consisting of rectifying diodes for rectifying said first and second high-frequency current sources, and capacitors, charged by said diodes, said capacitors being corresponding to a first and second DC current sources; c) a controllable half-bridge commutator having a first and a second control inputs, said commutator being coupled to said DC current sources, for commutating said DC current sources, for allowing to generate, from said DC current sources, the low-frequency AC current required for driving said electric load; and d) a control circuitry, having a first and a second outputs, said outputs being coupled to said first and second control inputs, respectively, and outputting two complimentary pulse trains, each of which having a frequency being automatically adjusted according to the operating conditions of said electric load, for controlling the switching time of said commutator, thereby causing said commutator to alternately change the direction of the current passing through said electric load.