Continuous mode ballast with pulsed operation

Details Continuous mode ballast with pulsed operation Continuous mode ballast with pulsed operation

2005-10-04

2005-10-04

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S224000, C315S20000A, C315S291000, C361S090000, C361S090000

Reexamination Certificate

active

06952085

ABSTRACT:
In accordance with one aspect of the present application, a continuous mode electronic ballast for operating an HID lamp includes an inverter circuit configured to generate a control signal. A resonant circuit is operationally coupled to the inverter circuit and to the lamp and configured to generate resonant voltage in response to receiving the control signal generated by the inverter circuit. A clamping circuit is operationally coupled to the resonant circuit to limit the voltage across the resonant circuit to protect components of the ballast. 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. The clamping circuit and the multiplier circuit cooperate to facilitate a continuous starting of the lamp.

REFERENCES:
patent: 4928038 (1990-05-01), Nerone
patent: 5225742 (1993-07-01), Beasley
patent: 5796216 (1998-08-01), Beasley
patent: 5914571 (1999-06-01), Beasley
patent: 6160362 (2000-12-01), Shone et al.
patent: 6417631 (2002-07-01), Chen et al.
patent: 6479949 (2002-11-01), Nerone et al.
patent: 2004/0207335 (2004-10-01), Nerone et al.
Unitrode Products Resonant-Mode Power Supply Controllers SLUS289-Oct. 1998.

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