Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Reexamination Certificate
2008-09-23
2011-10-25
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
C315S247000, C315S308000
Reexamination Certificate
active
08044600
ABSTRACT:
A brightness-adjustable LED driving circuit includes a rectifying and filtering circuit, a power factor correction power conversion circuit, and a detecting and controlling circuit. The rectifying and filtering circuit is used for filtering and rectifying a brightness adjusting voltage into a first DC voltage. The power factor correction power conversion circuit is electrically connected to the rectifying and filtering circuit and at least one LED string for generating an output current required for powering the at least one LED string. The detecting and controlling circuit detects phase data of the brightness adjusting voltage and the output current generated by the power factor correction power conversion circuit. The detecting and controlling circuit generates a control signal to the power factor correction controller according to the phase data of the brightness adjusting voltage, so that the magnitude of the output current is changed according to the phase data of the brightness adjusting voltage.
REFERENCES:
patent: 6172466 (2001-01-01), Ki et al.
patent: 6940733 (2005-09-01), Schie et al.
patent: 6944034 (2005-09-01), Shteynberg et al.
patent: 7852017 (2010-12-01), Melanson
patent: 2008/0030148 (2008-02-01), Tang et al.
Huang Chung-Tsai
Lee Po-Yi
Yan Shang-Jin
Delta Electronics , Inc.
Kirton & McConkie
Tran Thuy Vinh
Witt Evan R.
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