Patent ID: 7679293
Filing Date: 2010-03-16
Classification: H05B

Abstract:
1. An electronic ballast for providing an asymmetric time-varying electrical output signal to drive at least one lamp, the electronic ballast comprising: an input circuit with first and second input terminals receiving an input from a power source, the input circuit including a first capacitor coupled between the first input terminal and an intermediate node, a second capacitor coupled between the intermediate node and the second input terminal, a first inductor coupled between the first input terminal and a first bus node, and a second inductor coupled between the second input terminal and a second bus node; a switching circuit operatively coupled between the bus nodes and an output terminal to selectively couple alternate ones of the bus nodes with the output node to create a time-varying output signal at the output node, the switching circuit including: a resonant circuit including: an output circuit for outputting the asymmetric output signal to a lamp system.