Light controller with overload current protection circuit

Details Light controller with overload current protection circuit Light controller with overload current protection circuit

1994-01-21

1995-05-23

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315209R, 315291, 315307, 315309, 315 91, H05B 3702

Patent

active

054184355

ABSTRACT:
The invention provides a light controller for lamps which can reduce the number of parts, cost and size. A rectangular wave voltage output from an astable multivibrator (1) is inverted by an inverter (3) and then supplied to a gate of a P-channel MOS FET (5) for on/off driving the MOS FET (5). A current is thereby caused to flow through a lamp (7) for lighting it up. By changing a resistance value of a variable resistor (2), a cycle of the rectangular wave voltage is changed and, therefore, an amount of the current flowing through the lamp (7) is changed so as to vary the illumination intensity of the lamp.

REFERENCES:
patent: 4935641 (1990-06-01), Wilhelm
patent: 5332951 (1994-07-01), Turner et al.

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