Patent ID: 6236168
Filing Date: 2001-05-22
Classification: H05B

Abstract:
A circuit, comprising:a resonant inverter circuit including at least first and second switching elements;a first inductive element for energizing a first lamp, the first inductive element having a first terminal coupled to the first and second switching elements and a second terminal;a second inductive element for energizing a second lamp, the second inductive element having a first terminal coupled to the first terminal of the first inductive element and second terminal, wherein the first and second inductive elements are disposed on a single bobbin;a first capacitive element having a first terminal coupled to the second terminal of the first inductive element and a second terminal coupled to the second terminal of the second inductive element;a first DC blocking capacitor for coupling in series with the first lamp;a first parallel capacitor for coupling in parallel with the series coupled first lamp and first DC blocking capacitor;a second DC blocking capacitor for coupling in series with the second lamp; anda second parallel capacitor for coupling in parallel with the series coupled second lamp and second DC blocking capacitor;wherein said first and second inductive elements are configured such that substantially no current flows between them as a result of their mutual inductance when said first and second lamps are operational.