Switching power supply unit utilizing a voltage dropping circuit

Details Switching power supply unit utilizing a voltage dropping circuit Switching power supply unit utilizing a voltage dropping circuit

2000-01-04

2000-12-12

Tso, Edward H.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, H02M 3335

Patent

active

061607207

ABSTRACT:
A switching power supply unit containing a DC power supply; a transformer having a primary winding, a secondary winding and a feedback winding, a main switching element connected in series to the primary winding to be turned on by a voltage generated at the feedback winding, and a voltage dropping circuit for dropping the output voltage obtained form the secondary winding to reduce a fly-back voltage so that the voltage of a control terminal of the main switching element is maintained at a lower value than a threshold voltage of the main switching element.

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patent: 4688159 (1987-08-01), Marinus
patent: 4766528 (1988-08-01), Marinus
patent: 5012399 (1991-04-01), Takemura et al.
patent: 5745353 (1998-04-01), Sato et al.
patent: 5943222 (1999-08-01), Ogawa
patent: 5995382 (1999-11-01), Miyazaki et al.
patent: 6038143 (2000-03-01), Miyazaki et al.

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