Electrical transmission or interconnection systems – Plural supply circuits or sources – Selective or optional sources
Reexamination Certificate
2008-03-18
2008-03-18
Deberandinis, Robert L. (Department: 2836)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Selective or optional sources
C307S065000
Reexamination Certificate
active
07345380
ABSTRACT:
A backup power supply system supplies power from a first ac power source in normal condition. Once the first ac power source is abnormal or fails, the system automatically turns off the first ac power source and turns on a second ac power source with null transfer time. When the first ac power source is normal, a dc/ac power inverter is controlled to supply an approximately null current such that a mechanical switch is allowed to be closed and no circulating current is generated between the first ac power source and the dc/ac power inverter. Since the mechanical switch is continuously closed, and requires no switching operation, the backup power supply system can supply the backup power with a null transfer time.
REFERENCES:
patent: 6791850 (2004-09-01), Pai et al.
Chang Yao-Jen
Chou Hung-Liang
Feng Ya-Tsung
Huang Kuo-Fang
Shen Nan-Ying
Bacon & Thomas PLLC
Deberandinis Robert L.
Kaplan Hal I
UIS Abler Electronics Co., Ltd.
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