초록 ▼

An uninterruptible power supply for providing continuous power from a power source line to a load is provided. In particular, the uninterruptible power supply may either operate in an “Off-Line”mode or one of two “On-Line”modes. The uninterruptible power supply operates in the “Off-Line”mode when th

An uninterruptible power supply for providing continuous power from a power source line to a load is provided. In particular, the uninterruptible power supply may either operate in an “Off-Line”mode or one of two “On-Line”modes. The uninterruptible power supply operates in the “Off-Line”mode when the power source line voltage is above a first threshold value. The uninterruptible power supply routes power from the power source line to the load in the “Off-Line”mode. The uninterruptible power supply operates in a first “On-Line”mode when the power source line voltage drops below a first threshold value but exceeds a second threshold voltage, or the frequency of the power source line exceeds a predetermined range. The uninterruptible power supply boosts the power source line voltage in the first “On-Line”mode of operation and applies the boosted signal to the load. The uninterruptible power supply operates in a second “On-Line”mode of operation when the voltage of the power source line voltage drops below a second threshold value or exceeds a third threshold value. The uninterruptible power supply routes reserve power from an energy storage device to the load in the second “On-Line”mode of operation.

대표청구항 ▼

An uninterruptible power supply to provide AC electrical power from a power source line to a load, comprising: a. a line booster circuit coupled to the power source line in a first on-line mode of operation to increase the voltage supplied to the load from the power source line in response to the vo

An uninterruptible power supply to provide AC electrical power from a power source line to a load, comprising: a. a line booster circuit coupled to the power source line in a first on-line mode of operation to increase the voltage supplied to the load from the power source line in response to the voltage of the power source line dropping below a first voltage threshold value while being above a second threshold value or deviating from a specified frequency range; said booster circuit including, (i) a first converter coupled to the power source line to rectify a line AC signal and generate a DC signal, (ii) a second converter coupled to the first converter to increase the voltage of said DC signal generated by said first converter in said first on-line mode of operation and coupled to an internal DC energy storage device providing another DC signal in a second on-line mode of operation, and (iii) an inverter coupled to the second converter to convert the DC signals from said first converter and said internal DC energy storage device to a load AC signal; b. an internal supply circuit including said internal DC energy storage device to supply reserve power to the load in said second on-line mode of operation in response to the voltage of the power source line dropping below said second threshold value or exceeding a third threshold; c. a transfer switch to selectively connect said power source line, said line booster circuit, and said internal supply circuit to the load; d. a system switch to selectively connect the power source line to said line booster circuit and said transfer switch; e. a main bypass switch to selectively connect the power source line and said transfer switch to the load; f. a contactor interposed between said first converter and said DC energy storage device to selectively isolate said energy storage device from said first converter; and g. a processor for monitoring and controlling the power supply and being operable: (1) to configure said system switch, said transfer switch, and said main bypass switch to pass AC power directly from said power source line to said load in an off-line mode of operation, (2) to close said system switch to apply AC power from said power source to said line booster circuit and to configure said transfer switch to route AC power only from said inverter to said load in said first on-line mode of operation, and (3) to open said system switch to isolate AC power from the power source line, shut down said first converter and apply DC power from said DC energy storage device to said second converter through said contactor and configure said transfer switch so as to apply AC power only from said inverter to the main bypass switch in said second on-line mode of operation.