Lamp current control device

Details Lamp current control device Lamp current control device

2007-08-28

2007-08-28

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

C315S274000, C315S291000, C315S307000, C315S312000

Reexamination Certificate

active

11225066

ABSTRACT:
A lamp current control device includes an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC. The transformer has its primary side connected to the electronic power switch and a secondary side connected to a lamp. The current transformer is serially connected with the primary side of the transformer. The PWM IC is coupled between a secondary side of the current transformer and the electronic power switch and uses the current transformer to feedback a feed back signal from the primary side of the transformer. The PWM IC receives and processes the feed back signal to obtain a control signal, and then the PWM IC outputs the control signal to the electronic power switch to control a pulse width outputted by the electronic power switch, thereby controlling and maintaining a brightness of the lamp.

REFERENCES:
patent: 4328537 (1982-05-01), Schmidtner et al.
patent: 5418709 (1995-05-01), Lukemire

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