Uninterruptible power supplies with dual-sourcing capability and methods of operation thereof
First Claim
1. An uninterruptible power supply (UPS), comprising:
- an AC source port configured to connect to an AC power source;
a load port configured to connect to a load;
a rectifier circuit that selectively couples the AC source port to first and second voltage busses through a first inductance;
an inverter circuit that selectively couples the load port to the first and second voltage busses through a second inductance; and
a bidirectional DC source coupling circuit operative to couple a DC power source to the first and second voltage busses to provide bidirectional power transfer between the DC power source and the first and second voltage busses.
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Accused Products
Abstract
An uninterruptible power supply (UPS) includes an AC source port configured to connect to an AC power source, a DC source port configured to connect to a DC power source and a load port configured to connect to a load. A rectifier circuit is operative to selectively couple the AC source port to first and second voltage busses through a first inductance. An inverter circuit is operative to selectively couple the load port to the first and second voltage busses through a second inductance. A bidirectional DC source coupling circuit is operative to couple the DC source port to the first and second voltage busses to provide bidirectional power transfer therebetween, preferably such that a voltage at the DC source port is maintained in a substantially fixed proportion to first and second DC voltages at respective ones of the first and second voltage busses. In one embodiment, the bidirectional DC source coupling circuit includes a transformer having first and second inductively coupled windings, the first winding having first and second end taps and a center tap coupled to the neutral bus. A switching circuit is operative to selectively couple the first end tap of the first winding to the first and second voltage busses. A rectifying circuit couples the second end tap of the first winding to the first and second voltage busses. A bidirectional DC-AC converter circuit is coupled between the second winding and the DC source port. Related operating methods are also discussed.
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Citations
33 Claims
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1. An uninterruptible power supply (UPS), comprising:
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an AC source port configured to connect to an AC power source; a load port configured to connect to a load; a rectifier circuit that selectively couples the AC source port to first and second voltage busses through a first inductance; an inverter circuit that selectively couples the load port to the first and second voltage busses through a second inductance; and a bidirectional DC source coupling circuit operative to couple a DC power source to the first and second voltage busses to provide bidirectional power transfer between the DC power source and the first and second voltage busses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An uninterruptible power supply (UPS), comprising:
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an AC source port configured to connect to an AC power source, the AC source port including a phase bus and a neutral bus; a DC source port configured to connect to a DC power source; a load port configured to connect to a load, the load port including a load bus and the neutral bus; first and second voltage busses; a first switching circuit that selectively couples the phase bus to the first and second voltage busses through a first inductance; a second switching circuit that selectively couples the load bus to the first and second voltage busses through a second inductance; a transformer including first and second inductively coupled windings, the first winding including a center tap coupled to the neutral bus; a third switching circuit that selectively couples the first and second voltage busses to a first end tap of the first winding; a rectifying circuit that rectifyingly couples a second end tap of the first winding to the first and second voltage busses; and a DC-AC converter circuit that selectively couples the DC source port to the second winding. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of selectively transferring power to a load from an AC source and a DC source, the method comprising the steps of:
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selectively coupling the AC source to first and second voltage busses through a first inductance; selectively coupling the load to the first and second voltage busses through a second inductance; and bidirectionally coupling the DC source to the first and second voltage busses to provide bidirectional power transfer between the DC source and the first and second voltage busses. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification