초록 ▼

An uninterrupted power supply (UPS) systems is provided comprising a rectifier circuit, an inverter circuit and a battery boost circuit. One of the input terminals of the rectifier circuit is for connection to the ungrounded conductor of an AC power source and the other input terminal of the rectifi

An uninterrupted power supply (UPS) systems is provided comprising a rectifier circuit, an inverter circuit and a battery boost circuit. One of the input terminals of the rectifier circuit is for connection to the ungrounded conductor of an AC power source and the other input terminal of the rectifier circuit is for connection to the grounded conductor of the AC power source. The UPS has a pair of load terminals for connection to a load. The input terminal of the rectifier circuit for connection to the grounded conductor is connected to one of the pair of load terminals by an electrical conductor whose electrical continuity is maintained from this input terminal to the one of the pair of load terminals without any isolation device such as a 50 or 60 Hz transformer being disposed between the input terminal and the one of the pair of load terminals.

대표청구항 ▼

An uninterrupted power supply system comprising: rectifier means for effecting rectification of alternating-current utility voltage to obtain direct current voltage, said rectifier means having a first input terminal for connection to the ungrounded conductor of an alternating-current utility power

An uninterrupted power supply system comprising: rectifier means for effecting rectification of alternating-current utility voltage to obtain direct current voltage, said rectifier means having a first input terminal for connection to the ungrounded conductor of an alternating-current utility power source and a second input terminal for connection to the grounded conductor of said alternating-current utility power source; a pair of load terminals for connection to a load, said second input terminal of said rectifier means being connected to one of said pair of load terminals by an electrical conductor whose electrical continuity is maintained from said second input terminal of said rectifier means to said one of said pair of load terminals and without any isolation means being disposed between said second input terminal and said one of said pair of load terminals; inverter means for conversion of said direct-current voltage produced by said rectifier means to alternating-current voltage and for maintaining the level of said alternating-current voltage across said pair of load terminals in a desired range under normal conditions wherein the voltage of said alternating-current utility power source is in a predetermined range above or below a desired level; said rectifier means further including: first and second output terminals, a first capacitor connected between said first output terminal and said electrical conductor; and a second capacitor connected between said second output terminal and said electrical conductor, said rectifier means producing rectified line +DC voltage across said first capacitor and producing rectified line -DC voltage across said second capacitor when said first and second input terminals of said rectifier means are connected, respectively, to the ungrounded conductor and grounded conductor of said alternating-current utility power source; battery means, and battery boost circuit means coupled to said battery means and to said first and second capacitors for producing a +DC voltage across said first capacitor and a -DC voltage across said second capacitor during emergency conditions wherein the voltage of said alternating-current utility power source falls below a second desired voltage level.