Fast utility disconnect switch for single conversion UPS
First Claim
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1. A UPS power supply system comprising:
- an input line structured to receive electric power from a power grid;
an output line structured to provide electric power to a load;
a secondary power supply operatively coupled with the output line;
a utility disconnect switch (UDS) coupled with the input line and the output line and structured to selectably connect and disconnect the input line and the output line, the UDS including a UDS module comprising;
a first current path coupled between the input line and the output line and including a first plurality of semiconductor devices coupled each including an anode and cathode, wherein each of the first plurality of semiconductor devices is coupled together anode to cathode,a second current path coupled in parallel with the first current path and including a second plurality of semiconductor devices each including an anode and cathode and wherein each of the second plurality of semiconductor devices is coupled together anode to cathode,wherein the first current path includes;
a semiconductor switching device connected between the input line and the output line,a surge arrester coupled in parallel with the semiconductor switching device,a dynamic voltage balancing device coupled in parallel with the semiconductor switching device, anda static voltage balancing device coupled in parallel with the semiconductor switching device.
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Abstract
One embodiment is a uninterruptable power supply (UPS) system including a utility disconnect switch (UDS) coupled with an input line and an output line and structured to selectably connect and disconnect the input line and the output line. The UDS includes a semiconductor switching device connected between the input line and the output line, a surge arrester coupled in parallel with the semiconductor switching device, a dynamic voltage balancing device and a static voltage balancing device which are coupled in parallel with the semiconductor switching device.
40 Citations
29 Claims
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1. A UPS power supply system comprising:
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an input line structured to receive electric power from a power grid; an output line structured to provide electric power to a load; a secondary power supply operatively coupled with the output line; a utility disconnect switch (UDS) coupled with the input line and the output line and structured to selectably connect and disconnect the input line and the output line, the UDS including a UDS module comprising; a first current path coupled between the input line and the output line and including a first plurality of semiconductor devices coupled each including an anode and cathode, wherein each of the first plurality of semiconductor devices is coupled together anode to cathode, a second current path coupled in parallel with the first current path and including a second plurality of semiconductor devices each including an anode and cathode and wherein each of the second plurality of semiconductor devices is coupled together anode to cathode, wherein the first current path includes; a semiconductor switching device connected between the input line and the output line, a surge arrester coupled in parallel with the semiconductor switching device, a dynamic voltage balancing device coupled in parallel with the semiconductor switching device, and a static voltage balancing device coupled in parallel with the semiconductor switching device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A utility disconnect switch comprising:
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an input structured to receive electric power from a utility power source; an output structured to provide electric power to a load; a first current flow path coupled between the input and the output and permitting current flow in a first direction from the input to the output, the first current flow path including a first plurality of semiconductor switching devices, each including an anode and a cathode, wherein each of the first plurality of semiconductor switching devices is coupled together anode to cathode; and a second current flow path permitting current flow in a second direction from the output to the input, the second current flow path coupled in parallel with the first current flow path and including a second plurality of semiconductor switching devices each including an anode and a cathode and wherein each of the second plurality of semiconductor switching devices is coupled together anode to cathode; wherein the first current flow path and the second current flow path each include sets of passive devices coupled in parallel with respective ones of the first plurality of semiconductor switching devices and the second plurality of semiconductor switching devices and structured to provide energy absorption and voltage clamping when the semiconductor switching devices are turned off to open the utility disconnect switch, and to provide static and dynamic voltage balancing across the semiconductor devices. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method comprising:
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operating a power supply system comprising an input line structured to receive electric power from a utility, an output line structured to provide electric power to a load, a backup power supply operatively coupled with the output line, and a utility disconnect switch (UDS) including a first current path coupled between the input line and the output line and including a first plurality of semiconductor devices coupled each including an anode and cathode, wherein each of the first plurality of semiconductor devices is coupled together anode to cathode, and a second current path coupled in parallel with at least a portion of the first current path and including a second plurality of semiconductor devices each including an anode and cathode and wherein each of the second plurality of semiconductor devices is coupled together anode to cathode, the UDS being structured to selectably connect and disconnect the input line from the output line; controlling the UDS to open a semiconductor switching device effective to disconnect the input line from the output line; arresting a voltage surge in the UDS during the act of controlling; clamping a maximum voltage of the USD to a maximum voltage during the act of controlling the UDS; balancing a static voltage across the semiconductor switching device during the act of controlling the UDS; and balancing a dynamic voltage across the semiconductor switching device during the act of controlling the UDS. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification