Starting circuit for gaseous discharge lamps

Details Starting circuit for gaseous discharge lamps Starting circuit for gaseous discharge lamps

1982-01-18

1983-11-15

Dixon, Harold

Electric lamp and discharge devices: systems

Load device in the primary and secondary circuit of the...

315207, 315276, 315289, 315DIG5, H05B 3700

Patent

active

044158378

ABSTRACT:
A starting circuit for a high intensity discharge lamp. To provide the high voltage necessary for starting the lamp, the circuit uses a tapped transformer feeding a resistance-capacitance charging network coupled across the lamp. A voltage sensitive symmetrical switch is located in the network between the transformer tap and the RC junction to trigger the circuit when the open circuit voltage of the ballast is at its peak. A diode within the network is in series with resistance to allow current to flow during one half cycle of the cycle allowing the use of an inexpensive resistor in the RC network. A bleed resistor is placed in shunt of the capacitor to stabilize the triggering time of the network.

REFERENCES:
patent: 3889152 (1975-06-01), Bodine et al.
patent: 3963958 (1976-06-01), Nuckolls
patent: 4005336 (1977-01-01), Casella
patent: 4143304 (1979-03-01), Hitchcock

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