Protective device and a CCFL driving system used thereon

Details Protective device and a CCFL driving system used thereon Protective device and a CCFL driving system used thereon

2007-05-15

2007-05-15

Vu, David (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

C315S126000, C315SDIG002

Reexamination Certificate

active

11409978

ABSTRACT:
A protective device and a CCFL driving system using the same are provided. The protective device employs a short detecting circuit to receive a high AC power at the high terminal of the CCFL through a step-down capacitor. The protective device outputs a short-circuit protective signal during a shorting event. A rectified diode receives high AC power through the step-down capacitor, and outputs high DC power. A first charging capacitor couples with the rectified diode, and generates a detecting voltage in response to the high DC power. An open detecting circuit, having a threshold, couples with the first charging capacitor. The open detecting circuit outputs an open-circuit protective signal when the detecting voltage is over the threshold. The protective device of the present invention has a lighting voltage-limited circuit, which couples with the first charging capacitor. The lighting voltage-limited circuit receives the detecting voltage, and outputs an over-voltage protective signal.

REFERENCES:
patent: 6087776 (2000-07-01), Yamashita et al.
patent: 6710551 (2004-03-01), Mita et al.

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