Switching power supply unit

Details Switching power supply unit Switching power supply unit

H - Electricity

02

M

H02M 7/217 (2006.01) H02J 1/00 (2006.01) H02J 9/00 (2006.01) H02M 3/28 (2006.01) H02M 3/335 (2006.01) H02M 3/338 (2006.01)

Patent

CA 2295382

A switching power supply unit comprises 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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