UPS with bi-directional power flow
First Claim
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1. An uninterruptible power supply having a stand-by mode of operation and a back-up mode of operation, said power supply comprising:
- input means for receiving input AC power from an AC power source;
output means for providing AC power to a load;
AC power switch means coupled to said input means and to said output means for switchably coupling said input AC power to said load during said stand-by mode;
inverter means coupled to said input means, said output means and to a storage capacitor for receiving said input AC power to charge said storage capacitor during said stand-by mode and to provide AC power to said load from the charge stored in said storage capacitor during said back-up mode;
converter means coupled to said storage capacitor and to a battery for charging said battery with energy stored in said storage capacitor during said stand-by mode and charging said storage capacitor with energy stored in said battery during said back-up mode; and
control means coupled to said AC power switch means, said inverter means and said converter means for controlling the operating modes of said power supply.
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Abstract
AS uninterruptible power supply (UPS) is disclosed in which AC line power is used to charge back-up battery and to operate a load during a stand-by mode of operation of the UPS. In the back-up mode of operation when AC line power is not available, the battery is used to supply power to the load. The UPS is implemented with only one inexpensive high frequency transformer and a single bi-directional power converter. Thus, the UPS of the present invention is lower in cost and complexity than such UPSs known in the prior art.
54 Citations
11 Claims
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1. An uninterruptible power supply having a stand-by mode of operation and a back-up mode of operation, said power supply comprising:
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input means for receiving input AC power from an AC power source; output means for providing AC power to a load; AC power switch means coupled to said input means and to said output means for switchably coupling said input AC power to said load during said stand-by mode; inverter means coupled to said input means, said output means and to a storage capacitor for receiving said input AC power to charge said storage capacitor during said stand-by mode and to provide AC power to said load from the charge stored in said storage capacitor during said back-up mode; converter means coupled to said storage capacitor and to a battery for charging said battery with energy stored in said storage capacitor during said stand-by mode and charging said storage capacitor with energy stored in said battery during said back-up mode; and control means coupled to said AC power switch means, said inverter means and said converter means for controlling the operating modes of said power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification