D.C. voltage supply circuit for fluorescent lamps

Details D.C. voltage supply circuit for fluorescent lamps D.C. voltage supply circuit for fluorescent lamps

1988-02-18

1990-04-03

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315225, 315127, 363 50, 363 55, 363 56, H05B 3702

Patent

active

049143557

ABSTRACT:
A d.c. voltage supply circuit including a flyback converter having an inductor which is alternatingly charged through an electronic switch and discharged via a diode onto a capacitor. The output voltage of the flyback converter is continuously monitored. If a threshold value is exceeded, the electronic switch, which is mounted in an input line of the flyback converter, is changed into the off-state. The off-state of the electronic switch is terminated as soon as the output voltage has again fallen below the threshold value. Loads requiring a specific d.c. voltage may be connected to different supply voltages without the need of changeovers. The circuit offers a high security in view of overvoltage from the power network. It is self-monitoring and protects the connected load.

REFERENCES:
patent: 4330816 (1982-05-01), Imazeki et al.

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