Patent ID: 7098609
Filing Date: 2006-08-29
Classification: H05B

Abstract:
1. A discharge lamp driving circuit comprising: a transformer having a primary side and a secondary side, a non-grounded side of the secondary side of the transformer being connected to one end of at least one discharge lamp; a transformer driving circuit connected to the primary side of the transformer; a control circuit connected to the transformer driving circuit; a current-voltage converting circuit arranged at the secondary side of the transformer and functioning to convert a current flowing in the secondary side of the transformer to a voltage, wherein an output signal from the current-voltage converting circuit is supplied to the control circuit through a lamp current controlling pattern connected to the current-voltage converting circuit; and a discharge detecting pattern, arranged between a grounded side of the secondary side of the transformer and ground, wherein a voltage induced at the discharge detecting pattern is detected thereby stopping supply of electric power to the secondary side of the transformer.