Switching power supply unit

Details Switching power supply unit Switching power supply unit

H - Electricity

02

M

H02M 3/36 (2006.01) H02M 3/338 (2006.01) H02M 7/32 (2006.01)

Patent

CA 2296205

A switching power supply unit includes 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, and a control circuit connected between the feedback winding and the control terminal of the main switching element, so that a DC output can be obtained. In this switching power supply unit, there are provided a voltage generating unit disposed on the primary side of the transformer to output a voltage according to a load power, and a delay circuit fore reducing the switching frequency by delaying the turn-on of the main switching element according to a voltage output from the voltage generating unit thereby to prolong the OFF time of the main switching element.

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