Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2008-04-03
2009-12-08
Vu, David Hung (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S219000, C315S247000, C315S291000
Reexamination Certificate
active
07629752
ABSTRACT:
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 (Z11) 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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Chen Wen-Lin
Ger Chih-Chan
Mi Tzu-Chiang
Hon Hai Precision Industry Co. Ltd.
Le Tung X
Niranjan Frank R.
Vu David Hung
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