Patent ID: 7332873
Filing Date: 2008-02-19
Classification: F21L,H05B,Y02B

Abstract:
1. An electrical drive circuit for starting and running fluorescent bulbs, comprising; a transformerless electrical drive circuit connected at a first input to a common return node of a power supply connected to a line cord and connected via a common output node to at least first and second fluorescent bulbs having a predetermined wattage rating; a first series connection between the common return node and the common output node including a first current limiting inductor, a first node, a first single pole single throw (SPST) switch and the first fluorescent bulb; and a second series connection between the common return node and the common output node including a second current limiting inductor, a second node, a second SPST switch and the second fluorescent bulb; wherein the at least first and second fluorescent bulbs are ignited and sustained in illumination in parallel as determined by a respective ON or OFF condition of each respective first and second SPST switches, independent of the starting characteristics of the first and the second fluorescent bulbs.