Lightweight electronic ballast for fluorescent lamps

Details Lightweight electronic ballast for fluorescent lamps Lightweight electronic ballast for fluorescent lamps

1981-08-21

1984-07-31

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315105, 315223, 315239, 315240, 315244, 315DIG4, 315DIG7, H05B 4129

Patent

active

044632860

ABSTRACT:
A lightweight, transistorized, inverter circuit is particularly adapted for starting and operating a screw-in compact fluorescent lamp intended for incandescent lamp replacement. Household-type AC is converted to DC with one terminal connected to the center tap of a transformer primary through a choke which constitutes a high impedance at the operating frequency. A tuned circuit capacitor is connected across the transformer primary and a current-limiting capacitor and the lamp to be operated are connected in series across the transformer primary. A pair of transistors are connected in push-pull arrangement between the end portions of the transformer primary and the other terminal of the DC source, with the base electrodes of the transistors connected to the transformer secondary winding so that the push-pull connected transistors oscillate at the tuned circuit resonant frequency which is determined by the inductance of the transformer primary winding and the total capacitance of the connected capacitor means. A potential is applied to the midpoint of the transformer secondary upon energization of the apparatus in order to initiate transistor conduction. The system operates with a high efficacy for the production of light.

REFERENCES:
patent: 3371244 (1968-02-01), Boland
patent: 3579026 (1971-05-01), Paget
patent: 3593060 (1971-07-01), Kryder
patent: 3781594 (1973-12-01), Roberts
patent: 4327308 (1982-04-01), Hwang et al.
Haver, Solid-State Flourescent Ballasts are Here, EDN, Nov. 6, 1976, vol. 21, No. 20, pp. 65-69.

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