Resonance inverter for driving R or RC or RL load

摘要

A resonant inverter has an LC-oscillatory circuit, a direct voltage source, an electronic switch and a control circuit. The last-named uses capacitors in a voltage-determining circuit which responds to the voltage drop across the switch relative to a voltage reference and a parallel resistance in a current-determining circuit which responds to the current through the oscillatory circuit and/or the switch relative to a reference current. The current is determined at least during two separate time intervals in one cycle of the oscillatory current, and on the basis of the comparison of these two time intervals, the control circuit evaluates the value of the reference voltage used by the voltage-determining circuit.