Uninterruptible power supply and line conditioner

Details Uninterruptible power supply and line conditioner Uninterruptible power supply and line conditioner

H - Electricity

02

J

323/5

H02J 7/10 (2006.01) H02J 9/06 (2006.01)

Patent

CA 1236524

Abstract of the Disclosure An uninterruptable power supply and line con- ditioner of the class using a local battery and the util- ity power lines as the sources of power for an AC load, and in which a pulse width modulation (PWM) inverter is used to convert the battery DC to the load AC and to charge the battery from the power lines. The utility power lines are effectively connected to the load by way of a series inductance, and the phase angle between the inverter out- put voltage and the effective input voltage to the induc- tance from the power lines controls the proportioning of current to the load and to the battery from the power lines, and from the inverter to the load. The necessary inverter current is reduced and the throughput efficiency improved by, in effect, providing a predetermined ratio R between the voltage applied to the input side of the inductor and the voltage at the inverter output; in a preferred embodiment the effective input voltage is about 1.1 times the inverter voltage, and is produced by use of magnetic shunts in a transformer which couples the utility line to the load.

464184

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