Limited current circuit of digital inverter for LCD backlight

Details Limited current circuit of digital inverter for LCD backlight Limited current circuit of digital inverter for LCD backlight

2011-03-22

2011-03-22

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

C315S2090SC, C315S225000, C315S291000

Reexamination Certificate

active

07911147

ABSTRACT:
A limited current circuit of this invention comprising: a transformer that raises an alternating current (AC) power supplied from the digital inverter to an AC voltage of a high voltage to light a lamp; a voltage/current detection unit that detects at least one of the current and voltage supplied to the lamp; an A/D converter that converts the detected voltage/current value of analog to a digital value; and a microcontroller unit (MCU) that induces an LCC check point after the start of a striking process, compares at least one of the output current value and voltage value from the transformer with a preset reference value on the basis of an output signal of the A/D converter and then shuts down the inverter when the output current value or voltage value is determined to be abnormal, wherein the reference value comprises at least one of the current value and voltage value measured at the LCC check point when an object having noninductive resistance is not contacted to the inverter.

REFERENCES:
patent: 6294879 (2001-09-01), Nagase et al.
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patent: 7208885 (2007-04-01), Hsu
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patent: 1717144 (2006-01-01), None
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Combined Search and Examination Report dated Mar. 20, 2007 for corresponding Great Britain Application No. GB0625317.3.
Office Action issued in corresponding Chinese Patent Application No. 200610172283.3; issued Mar. 29, 2010.

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