Single phase redundant power supplies for reducing phase current imbalances
First Claim
1. A single phase AC/DC power supply having a first input for receiving a first AC phase voltage in a polyphase AC power distribution system, a first output for supplying an amount of DC power to a load, a power circuit coupled between the first input and the first output, and a control circuit for controlling the power circuit, the control circuit configured to substantially eliminate AC phase current imbalances in the polyphase AC power distribution system by adjusting the amount of DC power supplied to the load via the first output and an amount of DC power supplied to the load by at least one other power supply having a second input coupled to a second phase voltage in the polyphase AC power distribution system and a second output coupled in parallel with the first output so the amount of DC power supplied to the load by the single phase AC/DC power supply is different than the amount of DC power supplied to the load by said at least one other power supply when the single phase AC/DC power supply and said at least one other power supply are so coupled to each other and the load and when a number of power supplies per phase of the polyphase AC power distribution system is the same.
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Abstract
A single phase redundant power supply system may include a first power supply having an input coupled to a first phase voltage in a polyphase power distribution system and an output coupled to a load for supplying an amount of DC power to the load, and a second power supply having an input for coupling to a second phase voltage in the polyphase power distribution system and an output coupled to the load for supplying an amount of DC power to the load. At least the first power supply is configured to reduce phase current imbalances in the polyphase power distribution system by adjusting the amount of DC power supplied to the load by the first power supply and the amount of DC power supplied to the load by the second power supply.
32 Citations
20 Claims
- 1. A single phase AC/DC power supply having a first input for receiving a first AC phase voltage in a polyphase AC power distribution system, a first output for supplying an amount of DC power to a load, a power circuit coupled between the first input and the first output, and a control circuit for controlling the power circuit, the control circuit configured to substantially eliminate AC phase current imbalances in the polyphase AC power distribution system by adjusting the amount of DC power supplied to the load via the first output and an amount of DC power supplied to the load by at least one other power supply having a second input coupled to a second phase voltage in the polyphase AC power distribution system and a second output coupled in parallel with the first output so the amount of DC power supplied to the load by the single phase AC/DC power supply is different than the amount of DC power supplied to the load by said at least one other power supply when the single phase AC/DC power supply and said at least one other power supply are so coupled to each other and the load and when a number of power supplies per phase of the polyphase AC power distribution system is the same.
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20. An AC phase current controller for a polyphase AC power distribution system having at least a first AC phase voltage and a second AC phase voltage, the first AC phase voltage and the second AC phase voltage coupled to inputs of a first power supply and a second power supply, the first power supply having an output coupled to a load for supplying an amount of DC power to the load, the second power supply having an output coupled to the load for supplying an amount of DC power to the load, the output of the first power supply coupled in parallel with the output of the second power supply, the controller configured to monitor a plurality of AC phase currents in the polyphase AC power distribution system and generate one or more control signals for adjusting the amount of DC power supplied to the load by the first power supply and the amount of DC power supplied to the load by the second power supply so the amount of DC power supplied to the load by the first power supply is different than the amount of DC power supplied to the load by the second power supply to substantially eliminate imbalances between the plurality of monitored AC phase currents when a number of power supplies per phase of the polyphase AC power distribution system is the same.
Specification