Patent ID: 6316881
Filing Date: 2001-11-13
Classification: H05B

Abstract:
An apparatus for efficiently converting a direct current (DC) signal into an alternating current (AC) signal for driving a load, comprising:(a) a H-bridge network of a plurality of switches for generating an AC signal from a DC signal coupled to the network of the plurality of switches, the AC signal being generated by a first portion of the network of the plurality of switches periodically opening and closing opposite to the periodic opening and closing of a second portion of the network of the plurality of switches, said first portion of the network being diagonally opposed to said second portion of the network;(b) a tank circuit being coupled between the network of the plurality of switches and the load, the tank circuit filtering the AC signal delivered to the load; and(c) a controller for periodically opening and closing portions of the network of the plurality of switches based on a resonant frequency of the tank circuit, so that the optimal amount of electrical power is provided for driving the load under a range of voltages provided by the DC signal.