Backlight inverter for inductively detecting current

Details Backlight inverter for inductively detecting current Backlight inverter for inductively detecting current

2007-10-16

2007-10-16

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S307000, C315S247000, C315S277000, C345S102000, C345S212000, C363S041000, C363S043000

Reexamination Certificate

active

11458946

ABSTRACT:
A backlight inverter using electromagnetic induction and full-wave rectification at a second side of a main transformer includes a drive unit for generating a first voltage and a main transformer having first and second coils. The main transformer converts the first voltage from the drive unit into a second voltage, and outputs an AC current of the second voltage to both ends of a lamp. An auxiliary transformer has a first auxiliary coil formed on a current line connecting between the second coil of the main transformer and the lamp and a second auxiliary coil inductively coupled with the first auxiliary coil. The auxiliary transformer detects the current flowing to the lamp. A full-wave rectifier rectifies the current detected by the auxiliary transformer, and a drive controller controls the PWM duty of the first voltage based on a voltage from the full-wave rectifier.

REFERENCES:
patent: 6442048 (2002-08-01), Sun et al.
patent: 6636190 (2003-10-01), Hirakata et al.
patent: 6812916 (2004-11-01), Hwang
patent: 2006/0284568 (2006-12-01), Chang et al.
patent: 2000306689 (2000-11-01), None

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