Charge pump circuit to operate control circuit

Details Charge pump circuit to operate control circuit Charge pump circuit to operate control circuit

2005-12-13

2005-12-13

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S224000, C315S291000, C315S20000A, C361S090000, C361S091100

Reexamination Certificate

active

06975076

ABSTRACT:
In accordance with one aspect of the present application a ballast for operating a lamp includes an inverter circuit configured to generate a control signal. A resonant circuit is configured for operational coupling to the inverter circuit and to the lamp to generate resonant voltage in response to receiving the control signal from the inverter circuit. A clamping circuit is operationally coupled to the resonant circuit to limit the voltage across the resonant circuit. A multiplier circuit is operationally coupled to the resonant circuit to boost the voltage clamped by the clamping circuit to a value sufficient to permit starting of the lamp. A pulsing circuit includes a power controller to pulse the inverter “ON” and “OFF,” and a charge pump circuit to operate the power controller. The charge pump circuit is operationally coupled to the clamping circuit to derive electrical power from the clamping circuit.

REFERENCES:
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patent: 5225742 (1993-07-01), Beasley
patent: 5796216 (1998-08-01), Beasley
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patent: 6417631 (2002-07-01), Chen et al.
patent: 6479949 (2002-11-01), Nerone et al.
UC3861, Resonant-Mode Power Supply Controllers, Texas Instruments webpage.
Unitrode Products Resonant-Mode Power Supply Controllers SLUS289-Oct. 1998.

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