Backup power supply control
AssigneeSchneider Electric It Corporation
InventorsChen Hui Jung, Shen Chen-Jui
Life of this patent
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Abstract
According to one aspect, embodiments of the invention provide an uninterruptible power supply (UPS) system comprising an input configured to receive input AC power, an output configured to provide output AC power to a load, a DC power source coupled to a DC bus, an inverter having an input coupled to the DC bus and an output coupled to the output of the UPS system, the inverter configured to receive DC power at the input from the DC bus and provide AC power having a voltage to the output, and a controller coupled to the output of the inverter and configured to operate the inverter based on an average voltage of the AC power at the output of the inverter.
Claims20
An uninterruptible power supply (UPS) system comprising:
- an input configured to receive input AC power;
- an output configured to provide output AC power to a load;
- a DC power source coupled to a DC bus;
- an inverter having an input coupled to the DC bus and an output coupled to the output of the UPS system, the inverter configured to receive DC power at the input from the DC bus and provide AC power having a voltage to the output;
- and
- a controller coupled to the output of the inverter and configured to operate the inverter based on an average voltage of the AC power at the output of the inverter.
A method for controlling an inverter having an output configured to provide AC power, the method comprising:
- sampling an output voltage of the AC power at the output of the inverter over a period of time;
- calculating an average output voltage of the inverter over the period of time;
- comparing the calculated average output voltage of the inverter to a predetermined average output threshold value;
- determining whether the calculated average output voltage is at least equal to the predetermined average output threshold value;
- and
- controlling the AC power at the output of the inverter based on the act of determining whether the calculated average output voltage is at least equal to the predetermined average output threshold value.
An uninterruptible power supply (UPS) system comprising:
- an input configured to receive input AC power;
- an output configured to provide output AC power to a load;
- a DC power source coupled to a DC bus;
- an inverter having an input coupled to the DC bus and an output coupled to the output of the UPS system, the inverter configured to receive DC power at the input from the DC bus and provide AC power to the output;
- and
- means for controlling the inverter based on average voltage of the AC power at the output of the inverter.
Dependencies are inferred from the claim text.