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US 6,288,916 B1Granted
Multiple output uninterruptible alternating current power supplies for communications system
AssigneeAlpha Technologies Inc.
InventorsFrank Liu, Pu Han, Lam Vu
Life of this patent
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Abstract
A UPS system for communications systems. The UPS system comprises an input stage that generates primary and standby AC power signals. The primary and standby AC power signals are passed through an isolation transformer and through an output rectifier to obtain an output DC power signal. A plurality of output inverters are used to generate a plurality of output AC power signals from the output DC power signal. A switch circuit is provided to connect one or more of the output DC power signals to one or more loads of the communications system.
Claims15
A UPS system for communications system comprising:
- an input stage primary and standby AC power signals;
- an isolation transformer operatively connected to receive the primary and standby AC power signals;
- an output rectifier operatively connected to the isolation transformer for generating an output DC power signal based on the primary and standby AC power signals;
- a plurality of output inverters, where each of the output inverters generates an AC power signal based on the output DC power signal;
- a switch array arranged between the output inverters and one or more loads of the communications system, the switch array comprising a primary switch arranged between each of the output inverters and the load associated therewith, and at least one secondary switch arranged between two of the loads associated with the output inverters;
- and
- switch control means for controlling the primary and secondary switches to connect one or more of the output AC power signals to one or more loads of the communication system.
4 more elements
A UPS system for a communications system comprising a plurality of loads, the UPS system comprising:
- an input stage that generates primary and standby AC power signals;
- an isolation transformer operatively connected to receive the primary and standby AC power signals;
- an output rectifier operatively connected to the isolation transformer for generating an output DC power signal based on the primary and standby AC power signals;
- a plurality of output inverters, where each of the output inverter generates an AC power signal for the load connected thereto based on the output DC power signal;
- a switch array arranged between the output inverters and the loads of the communications system, the switch array comprising a primary switch arranged between each of the output inverters and the load associated therewith, and at least one secondary switch arranged between two of the loads associated with the output inverters;
- and
- switch control means for controlling the switches to connect one or more of the output AC power signals to one or more loads of the communications system.
4 more elements
A method of supplying AC power to a communications system comprising the steps of:
- generating primary and standby AC power signals;
- passing the primary and standby AC power signals through an isolation transformer;
- generating an output DC power signal based on the primary and standby AC power signals;
- providing a plurality of output inverters, where each of the output inverters generates an AC power signal based on the output DC power signal;
- arranging a switch array between the output inverters and one or more loads of the communications system, the switch array comprising a primary switch arranged between each of the output inverters and the load associated therewith, and at least one secondary switch arranged between two of the loads associated with the ouput inverters;
- and
- controlling the primary and secondary switches to connect one or more of the output AC power signals to one or more loads of the communications system.
4 more elements
A system operatively connected between a source of a utiity power signal and at least one load for generating an uninterruptible power signal for use in communications networks, the system comprising:
- input terminals connected to the source of the utility power signal;
- output terminals connected to the at least one load;
- a transformer comprising first, second, and third windings;
- an input DC bus;
- an output DC bus;
- a battery;
- an input rectifier operatively connected between the input terminals and the first DC bus, where the rectifier generates a first DC power signal on the first DC bus based on the utility power signal;
- a battery charger operatively connected between the first DC bus and the battery for charging the battery;
- a first inverter operatively connected between the first DC bus and the first windings of the transformer for generating a primary AC power signal across the second windings;
- a second inverter operatively connected between the third windings of the transformer and the second DC bus based on at least one of the primary AC power signal and the standby AC power signal;
- a plurality of output inverters operatively connected between the second DC bus and the output terminals, where each output inverter generates an output AC power signal that energizes the at least one load;
- a swutch array operatively connected between the output inverters and the output terminals, the switch array comprising a primary switch arranged between each of the output inverters and the load associated therewith, and at least one secondary switch arranged between two of the loads associated with the output iverters;
- and
- a control circuit for controlling the switch array to connect a selected one of the plurality of output inverters to the at least one load.
11 more elements
Dependencies are inferred from the claim text.