Inverter circuit, backlight assembly, and liquid crystal...

Details Inverter circuit, backlight assembly, and liquid crystal... Inverter circuit, backlight assembly, and liquid crystal...

2008-07-22

2008-07-22

Vu, David H (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

C315S277000, C315S278000, C315S279000

Reexamination Certificate

active

07402957

ABSTRACT:
In an inverter circuit, inverter transformers supply AC voltage to discharge tubes. The inverter transformers are arranged such that the AC voltage at a respective first terminal of each secondary coil has an opposite polarity with respect to a corresponding second terminal of each secondary coil. Balance transformers have primary coils inserted in series between a reference terminal of the secondary coils of the inverter transformers and ground. The secondary coils of the balance transformers are connected in series to form a loop. One node of the loop is grounded and a voltage detection node is located on the loop. At least one secondary coil of the secondary coils of the balance transformers is interposed between the grounded node of the loop and the voltage detection node. Thus, an abnormal state or condition, such as an open circuit or a short circuit may be detected.

REFERENCES:
patent: 7250731 (2007-07-01), Jin
patent: 2005/0099143 (2005-05-01), Kohno
patent: 2004335443 (2004-11-01), None
patent: 2005-183099 (2005-07-01), None
patent: 2005203347 (2005-07-01), None
patent: 10-2003-0031406 (2003-04-01), None
patent: 10-2005-0068170 (2005-07-01), None

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