POWER DISTRIBUTION UNIT INRUSH CURRENT MONITOR AND METHOD FOR PROTECTING AN UNINTERRUPTIBLE POWER SUPPLY FROM INRUSH CURRENT

摘要

A power distribution unit (PDU) inrush current monitor (PICM) may be used to protect an uninterruptible power supply (UPS) from an inrush current from a PDU. In general, the PICM senses a power condition of the PDU (e.g., energized or de-energized) and places the UPS in the appropriate operational state or mode (e.g., a stop mode or a run mode) to avoid an inrush current to the UPS when the PDU is powered on and energized. The PICM thus protects the UPS while allowing the UPS to operate when needed. In one embodiment, the PICM provides a stop signal to the UPS to place the UPS into a stop mode while the PDU is de-energized and provides a run signal to the UPS to place the UPS into a run mode after the PDU is energized.

主权项

1. A PDU inrush current monitor (PICM) comprising:
an input power connection for connecting to a power distribution unit (PDU) and receiving electric power from the PDU when the PDU is energized; a control transformer electrically connected to the input power connection such that the control transformer is energized when the PDU is energized; a control relay electrically connected to the control transformer such that the control relay is energized when the control transformer is energized; and a UPS control connection coupled to the control relay and for connecting to an uninterruptible power supply (UPS), wherein the UPS control connection is configured to send a STOP signal to the UPS when the control relay is not energized and wherein the UPS control connection is configured to send a RUN signal to the UPS when the control relay is energized.