Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1999-02-02
2000-02-29
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 50, 363 55, 363123, 363 97, 323901, H02M 3335, H02M 324, H02H 710, H02H 7122
Patent
active
060317345
ABSTRACT:
Switched-mode power supplies having a switching transistor and a transformer, with whose primary winding the switching transistor is connected in series, usually require a starting circuit, which is connected to an input voltage. Since a current continually flows through the starting circuit even during normal operation, it is endeavoured to keep the said current as small as possible. The switched-mode power supply comprises a threshold value circuit, for example a Zener diode connected in series with a resistor, which keeps the driver circuit turned off after the switching-on of the switched-mode power supply, until the operating voltage for the driver circuit has exceeded a specific threshold value which is referred to one end of a winding on the primary side. As a result of this, it is possible to charge a charging capacitor via the starting circuit with a low current, without currents flowing away. The threshold value circuit is advantageously connected by one end to that end of a secondary winding which, by means of positive feedback, assists the activation of the driver stage.
REFERENCES:
patent: 4277824 (1981-07-01), Alberkrack
patent: 4323961 (1982-04-01), Josephson
patent: 4680687 (1987-07-01), Stasch et al.
patent: 5083254 (1992-01-01), Feldtkeller
patent: 5506764 (1996-04-01), Hon et al.
patent: 5748461 (1998-05-01), Preller
Search Report for German Patent Appln. No. 19805927.2.
JP 61-109458 A., In: Patents Abstracts of Japan, E-443, Oct. 4, 1986, vol. 10, No. 293.
Hermann Wolfgang
Kogel Reinhard
Louvel Jean Paul
Scharlach Peter
Deutsche Thomson-Brandt GmbH
Laks Joseph J.
Sragow Daniel E.
Tripoli Joseph S.
Vu Bao Q.
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