Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-05-01
1999-02-02
Berhane, Adolf
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363132, H02M 3335
Patent
active
058673733
ABSTRACT:
The invention relates to a switched-mode power supply having a switching transistor which periodically switches through a voltage which is applied to a primary winding of a transformer, having a base current network and having a switching stage for operating the switching transistor, and having a control stage for stabilizing a secondary voltage, the switching transistor having a switched-on phase, an off phase and an oscillation phase during operation. The switching transistor (TP20) of the switched-mode power supply according to the invention is switched through step by step during switching on, via a high-resistance resistor (RP05, RP06, RP07), a primary winding (6, 7) and a capacitor (CP24) . After this, the switched-mode power supply oscillates autonomously via this winding (6, 7) and is controlled by the control stage (TP24) . The switching transistor (TP20) switches through in a defined manner at the minimum of the first oscillation of the collector voltage, by means of a passive network (DP37, DP38, RP37) in parallel with the control stage (TP34). In consequence, the switch-on losses of the switching transistor are minimal. For a standby mode, the switched-mode power supply is provided with an additional network (CP38, RP38) which switches the switching transistor on for a defined time.
REFERENCES:
patent: 4802076 (1989-01-01), Asai
patent: 5390100 (1995-02-01), Palata
patent: 5406469 (1995-04-01), Schwarz
patent: 5657218 (1997-08-01), Rilly et al.
patent: 5675479 (1997-10-01), Tani et al.
JP Patent Abstracts of Japan: 5-284747A, E-1503, Feb. 7, 1994 vol 18, No. 73. 5-168234A, E-1450, Oct. 20, 1993, vol. 17, No. 578 6-165489A, E-1606, Sep. 14, 1994, vol. 18, No. 493 5-244721A, E-1532, Mar. 31, 1994, vol. 18, No. 188.
Lohrer Stephan
Louvel Jean-Paul
Scharlach Peter
Berhane Adolf
Deutsche Thomson-Brandt GmbH
Laks Joseph J.
Metelski Marion P.
Tripoli Joseph S.
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