초록 ▼

An uninterrupted power supply (UPS) system is provided with a power factor correction circuit. The UPS system includes a rectifier having input terminals for connection to an AC utility power source and output terminals. The power factor correction circuit is operatively connected to the input and o

An uninterrupted power supply (UPS) system is provided with a power factor correction circuit. The UPS system includes a rectifier having input terminals for connection to an AC utility power source and output terminals. The power factor correction circuit is operatively connected to the input and output terminals of the rectifier to cause the UPS system to exhibit substantially unity power factor to the AC utility power source.

대표청구항 ▼

A power factor correction circuit for providing power factor correction directly to an AC electrical circuit comprising: (a) input connection means for connection to an AC utility power source and for receiving input current; (b) inductor means connected to said input connection means for charging a

A power factor correction circuit for providing power factor correction directly to an AC electrical circuit comprising: (a) input connection means for connection to an AC utility power source and for receiving input current; (b) inductor means connected to said input connection means for charging and discharging said input current; (c) rectifier means connected to said inductor means for receiving discharged input current from said inductor means and for producing rectified inductor current when said input current is discharged from said inductor means; (d) switch means for conducting said input current on both the positive and negative half cycles of said AC utility power source, said switch means being connected to said inductor means, said rectifier means and said input connection means; (e) current sensing means for sensing the amount of said input charging current passing through said inductor means; (f) switch control means connected to said switch means, said switch control means including means coupled to said current sensing means for generating a switching control signal to close said switch means to permit said input current to charge said inductor means and to open said switch means to permit said inductor to discharge said input current into said rectifier means, said switch means being alternately closed and opened by said switching control signal such that the total current, comprising both said input current charged into said inductor means and said input current discharge from aid inductor means, passing through said inductor means is substantially similar to and is substantially in phase with the line voltage of said AC utility power source; and (g) output connection means coupled to said rectifier means for connecting to the electrical circuit, which includes capacitor means, which capacitor means receive said rectified inductor current and charge the voltages produced when said inductor means is discharged both during the positive and negative half cycles of said AC utility power source, a neutral line of the AC power utility power source being coupled to the electrical circuit without electrical interruption of the neutral line.