Patent ID: 8143804
Filing Date: 2012-03-27
Classification: H05B

Abstract:
1. A light source driving device for a light source module comprising a plurality of lamps, the light source driving device comprising: a power factor correction (PFC) circuit to convert received alternating current (AC) signals into direct current (DC) signals; a power stage circuit to convert the DC signals into square-wave signals; a power conversion circuit comprising a transformer having a primary winding and a secondary winding, to convert the square-wave signals to electrical signals capable of driving the light source module, wherein the transformer divides the light source driving device into a primary side and a secondary side, and the primary winding of the transformer is disposed on the primary side of the light source driving device and the secondary winding of the transformer is disposed on the secondary side of the light source driving device; a balancing circuit to balance current flowing through the plurality of lamps in the light source module; an inverter control signal processor disposed on the secondary side of the light source driving device, to receive a first control signal output from the secondary side of the light source driving device and generate a second control signal according to the first control signal; an inverter controller disposed on the primary side of the light source driving device and connected to the primary winding of the transformer, to drive the power stage circuit according to the second control signal output from the inverter control signal processor; and an isolation component connected between the inverter controller and the inverter control signal processor, to transmit the second control signal to the inverter controller and to isolate the inverter control signal processor from the inverter controllers; wherein the first control signal comprises a dimming signal and a switch signal, wherein the inverter control signal processor comprises a dimming circuit and a switch circuit to receive and process the dimming signal and the switch signal and output a processed dimming signal and a processed switch signal respectively, wherein the dimming circuit and the switch circuit are connected to the isolation component via a logic circuit.