Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1975-04-15
1976-07-13
Smith, Alfred E.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315287, 315290, 315308, 315DIG7, 321 2, 323DIG1, H05B 4129, H05B 4136, G05F 130
Patent
active
039696529
ABSTRACT:
An electronic circuit for starting and operating gaseous discharge lamps. A DC input is connected to a time-ratio control (TRC) circuit which includes a regulating transistor, a sensing resistor and a coasting inductor connected in series. A flyback diode is connected to the inductor for providing a discharge path for the inductor. The TRC circuit serves to ballast the gaseous discharge lamp. An inverter is connected to the TRC circuit for driving the lamp with square waves. A starting circuit is provided and is connected to one of the lamp electrodes for starting the lamp. A transient protection circuit is provided for the inverter to shunt transients back to the input. A TRC drive and control circuit is connected to the TRC regulating transistor and sensing resistor for controlling the regulating transistor. Power for the circuits which control the regulating transistor, the inverter and the starting circuit is provided by a feedback power supply which is connected in a circuit relationship with the lamp so that it supplies power substantially only while there is operating voltage for the lamp.
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patent: 3723887 (1973-03-01), Panico
patent: 3761796 (1973-09-01), Jensen
patent: 3781653 (1973-12-01), Marini
patent: 3818306 (1974-06-01), Marini
General Electric Company
LaRoche E. R.
Smith Alfred E.
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