BALLAST LEVEL CONTROL METHOD AND SYSTEM FOR CERAMIC METAL HALIDE LAMP

WIPO Patent Application WO/2012/145900

A1

A ballast level control method and system for a ceramic metal halide lamp is provided. The system includes a control chip (500), a voltage-booster circuit (100), a half-bridge control circuit (300), a driving circuit (400) and a programmable part (600) connected in sequence, and further includes a level switching circuit (200) comprising a voltage sampling circuit (210) and a switching circuit (220). The voltage sampling circuit (210) includes a first resistor (R1) and a second resistor (R2) connected in series between the positive output terminal and the negative output terminal of the voltage-booster circuit (100). The switching circuit (220) has a predetermined resistance when it is turned on. The programmable part (600) outputs a turn-on or turn-off signal to the switching circuit (220) to change the voltage of the second resistor (R2). The control chip (500) detects the voltage of the second resistor (R2) and changes the output voltage of the voltage-booster circuit (100) based on the detected voltage.

JPS58164194	DEVICE FOR FIRING DISCHARGE LAMP
WO/2003/056885	CIRCUIT ARRANGEMENT FOR OPERATION OF ONE OR MORE LAMPS
JP2007173077	BACKLIGHT DRIVING DEVICE, LIQUID CRYSTAL DISPLAY, TELEVISION SET, AND METHOD OF CONTROLLING BACKLIGHT DRIVING DEVICE

LIU WEI (CN)
LIAO HUAPING (CN)
ZHOU MAOHUA (CN)

PCT/CN2011/073377

November 01, 2012

April 27, 2011

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SHENZHEN SECOM TELECOM CO LTD (CN)
LIU WEI (CN)
LIAO HUAPING (CN)
ZHOU MAOHUA (CN)

H05B41/282

CN2572713Y	2003-09-10
CN1572126A	2005-01-26

SHENZHEN STANDARD PATENT & TRADEMARK AGENT LTD. (CN)
深圳市顺天达专利商标代理有限公司 (CN)

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