Lamp starting circuit

Details Lamp starting circuit Lamp starting circuit

1991-06-14

1994-06-14

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

Circuit interrupter in the inductance circuit

315205, 315276, 315289, 315DIG5, H05B 4114

Patent

active

053213386

ABSTRACT:
A hot restart circuit includes a storage capacitor and SCR connected across a tapped portion of a ballast with a breakdown device to start the SCR. A charging circuit for the storage capacitor includes a diode, pumping capacitor and choke in series from the ballast tap to the AC line and a further diode interconnecting the capacitors. The pumping capacitor increases the charge on the storage capacitor in a step-wise fashion until the breakdown voltage is reached, whereupon starting pulses are applied to the lamp.

REFERENCES:
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patent: 3889152 (1975-06-01), Bodine, Jr. et al.
patent: 3917976 (1975-11-01), Nuckolls
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patent: 4461982 (1984-07-01), Fahnrich
patent: 4695771 (1987-09-01), Hallay
patent: 4958107 (1990-09-01), Mattas et al.
patent: 5047694 (1991-09-01), Nuckolls et al.

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