Uninterruptible power supply with isolated bypass winding

Details Uninterruptible power supply with isolated bypass winding Uninterruptible power supply with isolated bypass winding

H - Electricity

02

J

348/17, 323/5

H02J 9/06 (2006.01) G06F 1/00 (2006.01)

Patent

CA 1241425

UNINTERRUPTIBLE POWER SUPPLY WITH ISOLATED BYPASS WINDING ABSTRACT OF THE DISCLOSURE An uninterruptible power supply including a transformer having a first input winding normally coupling an inverter AC source with a critical AC load, which transformer also includes a second input winding operable to supply power from a bypass source to the load in the event of malfunction of the inverter circuit. The inverter is of the four-quadrant pulse-width-modulated type, thereby to permit recharging of the battery which serves as the DC source to the inverter. An inductance is provided for varying the phase relationship between a utility voltage source and the inverter voltage to produce minimum real inverter current and the "break-even" operating conduction, and a step-up device is provided for increasing the utility voltage to further minimize the break-even inverter current required during normal operation, and to maximize the through-put efficiency.

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