Transformerless current-limiting circuit

Details Transformerless current-limiting circuit Transformerless current-limiting circuit

1987-09-28

1990-05-29

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Plural discharge devices and/or rectifiers in the supply...

315207, 315227R, 315244, 315247, 318138, 318507, H05B 3909, H05B 4116

Patent

active

049298712

ABSTRACT:
Appliances such as fluorescent lamps and low-voltage DC motors can be operated from household AC without a transformer by employing a current-limiting circuit which is compact, lightweight, reliable, draws less energy, and has fewer power consuming components than do prior devices for driving those applicances. The current-limiting circuit has 4 rectifiers in a bridge circuit and a current-limiting capacitor which should be selected to match the load, a larger capacitor being necessary to supply a larger current. When used to drive a discharge lamp, the current-limiting circuit should also contain an inductive coil in series with the current-limiting capacitor. Otherwise there may be undue flicker. The inductive coil and capacitor together improve the power factor and therefore reduce the current drawn from the line without reducing the lamp output.

REFERENCES:
patent: 3857063 (1974-12-01), Major et al.
patent: 4001637 (1977-01-01), Gray
patent: 4227118 (1980-10-01), Britton
patent: 4376261 (1983-03-01), von der Heide et al.
patent: 4752719 (1988-06-01), McEwan

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