Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural cathode and/or anode discharge device load
Patent
1975-04-15
1976-04-06
Segal, Robert
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Plural cathode and/or anode discharge device load
315DIG7, 315206, H05B 3700, H05B 4126, H05B 3702
Patent
active
039492672
ABSTRACT:
A circuit arrangement for starting a linear metal halide arc discharge lamp while in a transistor switching bridge inverter circuit. A pulse generator is electrically connected to a trigger electrode which is mounted in close proximity to the lamp for supplying pulsed high voltage. The trigger electrode is capacitively coupled to the lamp for supplying pulsed high voltage for starting the lamp. A first logic gate is connected in circuit between a pulse width modulator and a phase splitter driver and is responsive to lamp current to lock the driver in a constant mode until the lamp starts. A second logic gate is connected to the pulse generator and is responsive to lamp current to inhibit the generator when the lamp is on. The pulse width modulator produces, when enabled, a variable pulse train having a fast rise and fall time. This variable pulse train is delivered to the phase splitter driver within which is developed the signal for driving the inverter. A differential amplifier is responsive to the differences in light sensed at opposite ends of the lamp and is connected to the pulse width modulator to control its operation.
REFERENCES:
patent: 3536955 (1970-10-01), Sturdevant et al.
patent: 3789266 (1974-01-01), Polman et al.
General Electric Company
Segal Robert
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