Patent ID: 7045966

Claim:
A resonant inverter comprising: a self-oscillating driver circuit; a voltage source; a timing circuit comprising a timing capacitor connected to said driver circuit, two anti-parallel diodes and two resistors connected in series with respective ones of said two diodes, said two diodes being connected to said driver circuit and said two resistors being connected to a common terminal, and a further capacitor connecting said voltage source to a first node between a first one of said two diodes and the respective first one of said two resistors; a zero signal detector that changes an output signal when an input signal at a first input terminal changes polarity, an output terminal of said zero signal detector being connected to said further capacitor; a resonant tank connected to said driver circuit, and a feed back circuit that connects an output of said resonant tank to said first input terminal of said zero signal detector, said feed back circuit comprising a phase compensator and a controller that includes a source of a bias current that is connected to said first input terminal of said zero signal detector, wherein said zero signal detector initiates discharge of said further capacitor to said first one of said two resistors when said zero signal detector input signal changes polarity and superposes strobe pulses generated across said first one of said two resistors on a voltage of said timing terminal.