Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2009-06-30
2011-12-06
Cho, James H (Department: 2819)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S246000, C315S2090SC
Reexamination Certificate
active
08072157
ABSTRACT:
A circuit for driving a light emitting diode (LED), the circuit includes a timer, first to third electronic switches, and a regulator. The timer provides a pulse signal to switch the first and second electronic switches. The first electronic switch provides a first level signal to one end of the LED. The second electronic switch switches the third electronic switch on and off. The third electronic switch provides a third level signal to another end of the LED. The regulator adjusts the pulse signal to be at a predetermined frequency to control the first, second, and the third level signals to alternate between a high voltage level and a low voltage level at the predetermined frequency. The LED is driven to be on and off at the predetermined frequency by the first and third level signals.
REFERENCES:
patent: 6667583 (2003-12-01), Kerenyi
patent: 7583035 (2009-09-01), Shteynberg et al.
patent: 8013538 (2011-09-01), Zampini et al.
Chen Xiao-Zhu
Liu Lei
Wu Hung-Yi
Altis Law Group, Inc.
Cho James H
Hon Hai Precision Industry Co. Ltd.
Hong Fu Jin Precision Industry ( ShenZhen) Co., Ltd.
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