Backup power supply system with a null transfer time

Electrical transmission or interconnection systems – Plural supply circuits or sources – Selective or optional sources

Reexamination Certificate

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Details

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.

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