On-line uninterruptible power supplies with two-relay bypass circuit and methods of operation thereof
First Claim
1. An on-line uninterruptible power supply (UPS) comprising:
- an AC input configured to be coupled to an AC power source;
an output configured to be coupled to a load;
an AC/AC converter circuit coupled to the AC input and operative generate an AC voltage from the AC power source;
a first mechanical relay coupled between the AC/AC converter circuit and the output;
a second mechanical relay coupled between the AC input and the output; and
a control circuit operative to control the first and second mechanical relays to selectively place the UPS in an on-line mode in which the first mechanical relay couples the AC/AC converter circuit to the output and the second mechanical relay decouples the AC input from the output or a bypass mode in which the first mechanical relay decouples the AC/AC converter circuit from the output and the second mechanical relay couples the AC input to the output.
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Accused Products
Abstract
An on-line uninterruptible power supply (UPS) comprises an AC input configured to be coupled to an AC power source and an output configured to be coupled to a load. The UPS also includes an AC/AC converter circuit coupled to the AC input and operative to generate an AC voltage from the AC power source. A first mechanical relay (e.g., a single-pole single-throw (SPST) relay) is coupled between an output of the AC/AC converter circuit and the output. A second mechanical relay is coupled between the AC input and the output. The UPS further includes a control circuit operative to control the first and second mechanical relays to selectively place the UPS in an on-line mode in which the first mechanical relay couples the AC/AC converter circuit to the output and the second mechanical relay decouples the AC input from the output or a bypass mode in which the first mechanical relay decouples the AC/AC converter circuit from the output and the second mechanical relay couples the AC input to the output.
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Citations
22 Claims
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1. An on-line uninterruptible power supply (UPS) comprising:
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an AC input configured to be coupled to an AC power source;
an output configured to be coupled to a load;
an AC/AC converter circuit coupled to the AC input and operative generate an AC voltage from the AC power source;
a first mechanical relay coupled between the AC/AC converter circuit and the output;
a second mechanical relay coupled between the AC input and the output; and
a control circuit operative to control the first and second mechanical relays to selectively place the UPS in an on-line mode in which the first mechanical relay couples the AC/AC converter circuit to the output and the second mechanical relay decouples the AC input from the output or a bypass mode in which the first mechanical relay decouples the AC/AC converter circuit from the output and the second mechanical relay couples the AC input to the output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18)
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12. A method of operating an on-line uninterruptible power supply (UPS), the method comprising:
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providing a first mechanical relay coupled between an output of an AC/AC converter circuit of the UPS and an output of the UPS;
providing a second mechanical relay coupled between an AC input of the UPS and the output;
operating the first and second mechanical relays to place the UPS in an on-line mode in which the first mechanical relay couples the AC/AC converter circuit to the output and the second mechanical relay decouples the AC input from the output; and
operating the first and second mechanical relays to place the UPS in a bypass mode in which the first mechanical relay decouples the AC/AC converter circuit from the output and the second mechanical relay couples the AC input to the output. - View Dependent Claims (13, 19, 20, 21, 22)
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Specification