Uninterruptible power supply system and load transfer static switch for such a system
First Claim
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1. A UPS system including:
- a primary AC power supply connected to an AC load through a first static-controlled transfer switch, an auxiliary inverter and a standby DC voltage-source connected to said inverter, a second static-controlled transfer switch for connecting said inverter to said AC load, and means responsive to a critical event for disabling said first transfer switch and for enabling said second transfer switch;
the inverter comprising gating means operative first in a commutation mode concurrently with said critical event responsive means for applying, through said inverter and through said second transfer switch, to said first transfer switch the voltage of said DC-source as a commutation voltage thereof;
said inverter gating means being operative in a UPS mode after said commutation mode to generate an auxiliary AC power supply to the AC load.
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Abstract
A UPS system which operates initially in a commutation mode allowing commutation of the static transfer switch provided on the primary supply lines, and wherein the standby source is kept energized so as to operate to commutate such transfer switch through the inverter just before initiating UPS mode of operation.
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Citations
16 Claims
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1. A UPS system including:
- a primary AC power supply connected to an AC load through a first static-controlled transfer switch, an auxiliary inverter and a standby DC voltage-source connected to said inverter, a second static-controlled transfer switch for connecting said inverter to said AC load, and means responsive to a critical event for disabling said first transfer switch and for enabling said second transfer switch;
the inverter comprising gating means operative first in a commutation mode concurrently with said critical event responsive means for applying, through said inverter and through said second transfer switch, to said first transfer switch the voltage of said DC-source as a commutation voltage thereof; said inverter gating means being operative in a UPS mode after said commutation mode to generate an auxiliary AC power supply to the AC load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- a primary AC power supply connected to an AC load through a first static-controlled transfer switch, an auxiliary inverter and a standby DC voltage-source connected to said inverter, a second static-controlled transfer switch for connecting said inverter to said AC load, and means responsive to a critical event for disabling said first transfer switch and for enabling said second transfer switch;
Specification