Patent ID: 6628012
Filing Date: 2003-09-30
Classification: H02J

Abstract:
An apparatus for uninterruptedly supplying power as alternating current to an electrical load being supplied with power by an external power source during normal conditions, comprising:a coupling choke being operably arranged between the electrical load and the external source of power; a generator with a single winding being operably connected to said coupling choke on the side of the electrical load and being designed and arranged to be active during normal conditions and during trouble conditions in case the external source of power fails; an IGBT converter being directly connected to said coupling choke; a substitute storage device for electrical energy being operably connected to said coupling choke on the side of the electrical load by said converter; a fast-opening switch being operably connected said coupling choke on the side of the source of power and being designed and arranged to open in case of occurring trouble conditions; a first unit being designed and arranged to sense an output voltage being supplied to the electrical load and to produce a measuring signal; a second unit being designed and arranged to control the output voltage, to use the measuring signal as an input signal, to deliver a control signal as an output signal to said converter and to control the output voltage to a desired shape over time; and said first and second units being designed to operate both during normal and trouble conditions to improve the quality of the power supply to the electrical load also during normal conditions.