Patent ID: 7557516
Filing Date: 2009-07-07
Classification: H05B

Abstract:
1. A resonant inverter circuit, comprising: a resonant circuit, formed by a capacitor and an inductor to operate a lamp; a current transformer, coupled to said resonant circuit to generate control signals in response to a switching current of said resonant circuit; control circuits, including a first control circuit and a second control circuit, for generating switching signals in response to said control signals; a first transistor and a second transistor, coupled to said control circuits to switch said resonant circuit in response to said switching signals; a capacitor, coupled to said current transformer to produce a supply voltage for said second control circuit; a start-up resistor, wherein an input voltage charges said capacitor via said start-up resistor; and a charge-pump circuit, coupled to said capacitor to provide another supply voltage for said first control circuit; wherein said charge-pump circuit is operated in response to the switching operation of said first transistor and said second transistor.