Electric power conversion systems – Current conversion – With starting arrangement
Patent
1995-02-07
1996-11-12
Wong, Peter S.
Electric power conversion systems
Current conversion
With starting arrangement
323901, 323908, H02J 1100, H02P 1300
Patent
active
055746322
ABSTRACT:
A power supply which serves to convert an alternating voltage supplied by an electric mains, into a DC voltage, having a rectifier with input terminals for receiving the alternating voltage and output terminals for supplying a pulsating direct voltage. A first capacitor is connected parallel to the output terminals. An inverter has input terminals connected to the first capacitor. A current limiting circuit is connected between one of the rectifier output terminals and an electrode of the first capacitor in order to limit the inrush current occurring when the power supply is switched on. The current limiting circuit includes a parallel connection of a first resistor and a first switching element, with the first switching element being operative to be in an electrically non-conductive state upon switching on of the power supply and to change over to an electrically conductive state some time after the power supply is switched on. A detection circuit establishes the state of the first switching element and cooperates with a start circuit which is operative to generate a start signal for the inverter. When the detection circuit determines that the first switching element is in the conductive state, it prevents activation of the start circuit. Consequently, the power supply cannot operate if the first switching element is short-circuited by a defect.
REFERENCES:
patent: 4642746 (1987-02-01), Losel
patent: 4982306 (1991-01-01), Koroncai et al.
patent: 5087871 (1992-02-01), Losel
patent: 5420780 (1995-05-01), Bernstein et al.
Franzblau Bernard
Han Y. J.
U.S. Philips Corporation
Wong Peter S.
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