Control gear for high intensity gas discharge lighting

Details Control gear for high intensity gas discharge lighting Control gear for high intensity gas discharge lighting

1987-10-21

1989-11-14

Griffin, Robert L.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315289, H05B 4136

Patent

active

048810118

ABSTRACT:
A control gear for a high intensity discharge lamp comprising a switch element, and an oscillator connected to drive the switch element through the intermediary of a variable mark-space ratio driver arrangement. The switch element switches current in a series resonant circuit including the primary winding of a transformer, across the secondary winding of which the lamp is connected. A feedback circuit which receives signals controls the mark-space ratio to regulate the power consumed by the lamp in a closed loop. Initially, the mark-space ratio is set at a starting level such that a very high voltage is generated in the resonant circuit to cause starting of the lamp.

REFERENCES:
patent: 3551736 (1970-12-01), Doehner
patent: 3999100 (1976-12-01), Dendy et al.
patent: 4398129 (1983-08-01), Logan
patent: 4426603 (1984-01-01), Mustoe
patent: 4506195 (1985-03-01), Elms
patent: 4587460 (1986-05-01), Murayama et al.

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