H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/54
H05B 41/26 (2006.01)
Patent
CA 1094633
58-BD-6310 ABSTRACT OF THE DISCLOSURE 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 tran- sistor, 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 substan- tially only while there is operating voltage for the lamp.
253638
Company General Electric
Eckersley Raymond A.
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