| US 7,345,380 B2 | ||
| Backup power supply system with a null transfer time | ||
| Ya-Tsung Feng, Kaohsiung (Taiwan); Chin-Chang Wu, Kaohsiung (Taiwan); Hung-Liang Chou, Kaohsiung (Taiwan); Nan-Ying Shen, Kaohsiung (Taiwan); Kuo-Fang Huang, Kaohsiung (Taiwan); and Yao-Jen Chang, Kaohsiung (Taiwan) | ||
| Assigned to UIS Abler Electronics Co., Ltd., Hsintien, Taipei Hsien (Taiwan) | ||
| Filed on Jun. 29, 2004, as Appl. No. 10/878,268. | ||
| Claims priority of application No. 92129670 A (TW), filed on Oct. 24, 2003. | ||
| Prior Publication US 2005/0088043 A1, Apr. 28, 2005 | ||
| Int. Cl. H02J 9/00 (2006.01); H02J 5/00 (2006.01) | ||
| U.S. Cl. 307—80 [307/65] | 3 Claims |
| 1. A backup power supply system with a null transfer time, comprising:
a first static switch connected between a first ac power source and a load;
a second mechanical switch; and
a dc/ac power inverter including a dc terminal connected to a dc power source at its upstream side for converting the dc power
source into a second ac power source, and an ac terminal connected to the second switch so that the second switch is connected
between the dc/ac power inverter and the load;
wherein when the first power source is normal, the first switch and the second switch are closed, and the dc/ac power inverter
is controlled to supply an approximately null current; and
wherein when the first ac power source is abnormal or fails, the first switch is opened and the second switch is continuously
closed so that the dc/ac power inverter rapidly supplies a sine wave voltage to the load; whereby the second switch does not
require switching operation at the instant when the first ac power source is abnormal or fails.
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