Hybrid ballast for multiple discharge lamps

Details Hybrid ballast for multiple discharge lamps Hybrid ballast for multiple discharge lamps

1983-12-30

1989-07-11

Boudreau, Leo H.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Discharge device and/or rectifier in the cathode or heater...

315244, 315243, 315103, H05B 4116

Patent

active

048475351

ABSTRACT:
A hybrid ballast apparatus for starting and operating a plurality of series-connected discharge lamps and which provides protection against electric shock. The ballast apparatus includes first and second bidirectional thyristors connected in parallel with first and second ones of said lamps, respectively, and a trigger control circuit for simultaneously triggering the thyristors into conduction. Each lamp has two filaments and means are provided for connecting an L-C ballast device, the lamp filaments and the first and second thyristors in a series circuit across the AC supply voltage terminals. If one end of a lamp is removed from its socket, the series circuit is opened so that the maximum voltage at any lamp electrodes is limited to the AC supply voltage.

REFERENCES:
patent: 3665243 (1972-05-01), Kaneda et al.
patent: 3836817 (1974-09-01), Tschang et al.
patent: 3983449 (1976-09-01), Dear et al.
patent: 4145638 (1979-03-01), Kaneda et al.
patent: 4253043 (1981-02-01), Chermin et al.
patent: 4380719 (1983-04-01), De Bijl
patent: 4406976 (1983-09-01), Wisbey et al.

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