Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Reexamination Certificate
2008-03-24
2010-06-22
Vo, Tuyet (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
C315S277000, C315S274000, C315S312000, C315S291000
Reexamination Certificate
active
07741790
ABSTRACT:
A lamp current balance and feedback system and related method are disclosed for balancing the input and output currents of a lamp by making use of a lamp current balance and feedback mechanism. The operation of the lamp current balance and feedback mechanism includes coupling the input current of the lamp for generating a first balance current by a first transformer, coupling the output current of the lamp for generating a second balance current by a second transformer, coupling the first and second transformers for substantially equalizing the first and second balance currents, generating a feedback signal based on the first or second balance current by a feedback circuit, generating a pulse width modulation signal based on the feedback signal by a pulse width modulation signal generation circuit, and driving the input and output currents of the lamp based on the pulse width modulation signal by a driving circuit.
REFERENCES:
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patent: 7045967 (2006-05-01), Chen
patent: 7057359 (2006-06-01), Hung
patent: 2005/0285548 (2005-12-01), Moyer et al.
patent: 2006/0043909 (2006-03-01), Hwang et al.
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patent: 2007/0132400 (2007-06-01), Lee
Cho Yuan-Pin
Huang Yen-Chen
Lin Huang-Ti
Sun Chia-Hung
AU Optronics Corp.
Hsu Winston
Vo Tuyet
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