Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2006-07-04
2006-07-04
Dinh, Trinh Vo (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S247000, C315S291000, C323S288000
Reexamination Certificate
active
07071630
ABSTRACT:
Current is delivered to a load using a closed-loop boost circuit topology that is suitable for LED driver applications. An inductor is charged when a transistor is active during a first operating phase. The inductor delivers current to the load when the transistor is inactive during a second operating phase. A ramp circuit is enabled by at least a feed-forward circuit that detects when the inductor enters the charging cycle. The charging time of the inductor is controlled by a comparator that selectively disables the transistor in response to a ramp voltage and an error voltage. The slope of the ramp is adjusted in response to the error voltage, which is adjusted by an error amplifier that is responsive to the current in the load. The value associated with the inductor can be relatively small, and the boost circuit is arranged to operate over a wide range of operating frequencies.
REFERENCES:
patent: 6577512 (2003-06-01), Tripathi et al.
patent: 6586890 (2003-07-01), Min et al.
patent: 6760238 (2004-07-01), Charych
patent: 2002/0125872 (2002-09-01), Groom et al.
patent: 2006/0055389 (2006-03-01), Rice
Dinh Trinh Vo
Hertzberg Brett A.
Merchant & Gould P,C,
National Semiconductor Corporation
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