Uninterruptible power supply apparatus for receiving power from different electrical utility configurations

摘要

An uninterruptible power supply (UPS) apparatus is disclosed that can receive power from different electrical utility configurations. The input stage of the UPS includes a three phase rectifier bridge design having three legs configured for connection to the different electrical utility configurations. An advantage that may be realized in the practice of some disclosed embodiments of the UPS input stage is that a single UPS can have the flexibility to be used with different electrical utility configurations having different voltages and phases.

主权项

1. An uninterruptible power supply (UPS) apparatus for receiving power from a two-wire 120 VAC single phase input voltage having a first voltage source line and a neutral, the apparatus comprising:
a three phase rectifier bridge comprising a first leg comprising a first rectifier diode and a second rectifier diode with a first leg node located between and connecting the first and second rectifier diodes, a second leg comprising a third rectifier diode and a fourth rectifier diode with a second leg node located between and connecting the third and fourth rectifier diodes, and a third leg comprising a fifth rectifier diode and a sixth rectifier diode with a third leg node located between and connecting the fifth and sixth rectifier diodes, wherein the first leg, the second leg, and the third leg are connected in parallel; a switch connected in parallel with the three phase rectifier bridge; a direct current output circuit connected in parallel with the three phase rectifier bridge and the switch, the direct current output circuit comprising a first output bus and a second output bus with an output bus ground node located between and connecting the first output bus and the second output bus; a first UPS input connected to the second leg node of the three phase rectifier bridge with a first input filter inductor located between and connecting the first UPS input to the second leg node; a second UPS input connected to the third leg node of the three phase rectifier bridge with a second input filter inductor located between and connecting the second UPS input to the third leg node; a third UPS input directly connected to the output bus ground node; a fourth USP input directly connected to the first leg note of the three phase rectifier bridge; a power distribution unit (PDU) for providing an interface for connecting the two-wire 120 VAC single phase input voltage to the UPS, the power distribution unit comprising: a first PDU output directly connected to the first UPS input; a second PDU output directly connected to the second UPS input; a third PDU output directly connected to the third UPS input; a fourth PDU output directly connected to the fourth UPS input; a first PDU input directly connected to the first PDU output and the second PDU output; and a third PDU input directly connected to the third PDU output and the fourth PDU output.