| 摘要 |
A light source driving device is for driving a plurality of light sources of a light source module ( 12 ), and comprises an inverter circuit ( 11 ), a current sampling circuit ( 13 ) and a PWM controller ( 14 ). The inverter circuit converts a received DC signal to an electrical signal adapted for driving the light sources. The current sampling circuit for sampling current flowing through the inverter circuit, comprises an impedance detecting component (Z<SUB>11</SUB>) and an amplifying circuit ( 132 ), the impedance detecting component detects the current from the inverter circuit, the amplifying circuit is connected to the impedance detecting component for amplifying the current signal. The PWM controller is connected to the current sampling circuit for receiving the amplified current signal output from the current sampling circuit, and generating a control signal to the inverter circuit to control output thereof.
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