Discharge lamp operating circuit

Details Discharge lamp operating circuit Discharge lamp operating circuit

1990-07-20

1992-11-24

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315DIG5, 315DIG7, 331110, 363 17, 363132, H05B 3702, H05B 4136

Patent

active

051665794

ABSTRACT:
The discharge lamp operating circuit comprises two series circuits, each including two switching devices, connected in parallel with the power supply, a series circuit, including a choke coil, a first capacitor, and a parallel circuit with a discharge lamp and a second capacitor, and connected between the middle points of the one and the other series circuit, reverse-direction rectifiers connected in parallel with the corresponding switching devices, said discharge lamp operating circuit turning on and off said discharge lamp by turning on and off the switching devices alternately. In this discharge lamp operating circuit, the timing of switching the switching devices is set from the closed condition to the open condition at a time when the current flowing through the switching devices is almost at zero level.

REFERENCES:
patent: 4105957 (1978-08-01), Cathell
patent: 4459516 (1984-07-01), Zelina et al.
patent: 4688165 (1987-08-01), Pruitt
patent: 4734624 (1988-03-01), Nagase et al.
patent: 4757432 (1988-07-01), Hancock
patent: 4876635 (1989-10-01), Park et al.
patent: 4920300 (1990-08-01), Scott
patent: 4949016 (1990-08-01), De Bijl et al.

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