Patent ID: 7456518
Filing Date: 2008-11-25
Classification: H02J

Abstract:
1. An uninterruptible power supply for providing power to a load, the uninterruptible power supply comprising: an input to receive input power; an output to provide output power; a back-up power source configured to provide backup power; converter circuitry coupled to the output and to the backup power source and configured to provide the output power from the input power and the backup power; a contactor coupled to the input and to the converter circuitry and having an open state and a closed state; and a contactor control circuit having an output coupled to the contactor to provide an output voltage to control an operational state of the contactor, the contactor control circuit having a boost converter configured to receive an input DC voltage and controlled to provide an output voltage having a first voltage level to the contactor to control the contactor to switch from the open state to the closed state and to provide a second output voltage having a second voltage level to maintain the contactor in the closed state; wherein the converter circuitry further includes: an input circuit coupled through the contactor to the input of the uninterruptible power supply to receive input power and coupled to the back-up power source to receive back-up power and configured to selectively provide DC power derived from the input power and the back-up power; and an output circuit coupled to the input circuit to receive the DC power, and configured to provide AC power, derived from the DC power, at the output of the uninterruptible power supply.