Patent ID: 6175510
Filing Date: 2001-01-16
Classification: H02J

Abstract:
An uninterruptible power supply device, the device comprising:an input stage connected to an AC power supply and an output stage for supplying AC power to an appliance;a high frequency transformer;wherein said input stage has a first pair of switching means connected in series with the output stage and a second pair of switching means connected in parallel with the output stage, wherein each of said switching means is capable of switching current in two directions; and, wherein said first pair of switching means are respectively connected to the respective ends of a first winding of the high frequency transformer and said second pair of switching means are respectively connected to the respective ends of a second winding of the high frequency transformer;a controller operatively connected to said first and second pairs of switching means for controlling the direction of current through each of the respective switching means in response to detected changes in power conditions whereby, in use, regulated AC power can be supplied from the output stage.