FIELD: electricity.
SUBSTANCE: switching power supply unit comprises transformer (1), which includes at least one primary winding intended for connection via switching element (4) to permanent voltage, and which comprises at least one secondary winding intended for connection via rectifying circuit with load comprising at least one diode (2), at the same switching power supply unit comprises at least one piezoelectric fan (8), which causes air flow in transformer (1) and/or near switching element (4) and/or near diode (2). Developed air flow may be sent purposely to components to be cooled, at the same air flow remains low in general, and therefore there will be no contamination with particles contained in air.
EFFECT: reduced structural costs.
9 cl, 11 dwg
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