Lamp power supply circuit with feedback circuit for dynamically

Details Lamp power supply circuit with feedback circuit for dynamically Lamp power supply circuit with feedback circuit for dynamically

1996-05-10

1998-02-10

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315209R, 315224, 315291, 315DIG7, G05F 100

Patent

active

057172951

ABSTRACT:
A ballast circuit for a gas discharge lamp comprises a resonant load circuit incorporating a gas discharge lamp and including first and second resonant impedances whose values determine the operating frequency of the resonant load circuit. A d.c.-to-a.c. converter circuit is coupled to the resonant load circuit to induce an a.c. current in the resonant load circuit. It comprises first and second switches serially connected between a bus conductor at a d.c. voltage and ground, with a common node through which the bidirectional load current flows. An arrangement allows a user to select a setpoint signal during lamp operation that determines the amount of light output by the lamp. A feedback arrangement regeneratively controls the first and second switches; it includes a circuit for sensing a.c. current in the resonant load circuit and producing an a.c. feedback signal in proportion to the a.c. current; a circuit for producing a d.c. feedback signal representing an average value of a lamp output parameter; a circuit for generating an error signal between the setpoint signal and the d.c. feedback signal; a comparator circuit for comparing the a.c. feedback signal with a periodic reference signal, and for producing a comparator output signal that changes state when a one of the compared signals becomes greater than the other of the compared signals, and vice-versa; and a circuit for generating the periodic reference signal in response to both the comparator output signal and the error signal. A conditioning circuit receptive of the comparator output signal controls the first and second switches.

REFERENCES:
patent: 4251752 (1981-02-01), Stolz
patent: 4383203 (1983-05-01), Stanley
patent: 4523131 (1985-06-01), Zansky
patent: 4988920 (1991-01-01), Hoeksma
patent: 5075599 (1991-12-01), Overgoor et al.
patent: 5341068 (1994-08-01), Nerone
patent: 5363020 (1994-11-01), Chen et al.
patent: 5414325 (1995-05-01), Allison
patent: 5550436 (1996-08-01), Houk

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