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1. (WO2018105293) SWITCHING POWER SUPPLY

Pub. No.:    WO/2018/105293    International Application No.:    PCT/JP2017/040279
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Thu Nov 09 00:59:59 CET 2017
IPC: H02M 3/28
Applicants: NTN CORPORATION
NTN株式会社
Inventors: HANEDA Masaji
羽田 正二
Title: SWITCHING POWER SUPPLY
Abstract:
In this flyback-type switching power supply, withstand voltage characteristics of an output diode are achieved at low cost. This flyback-type switching power supply has a transformer T and a switching element Q connected to a primary coil Np, and is provided with a first rectification means D1 and a second rectification means D2 connected in series between one end a of a secondary coil Ns and a first output terminal 3, a third rectification means D3 which is connected between the other end d of the secondary coil Ns and the connection point b between the first rectification means D1 and the second rectification means D2, and a smoothing capacitor which is connected between the first output terminal 3 and a second output terminal 4, which is the other end d of the secondary coil Ns, wherein the first rectification means and the second rectification means are connected in a direction that produces a reverse bias with respect to the potential generated at the one end of the secondary coil during the ON period of the switching element, and the third rectification means is connected in a direction that produces a forward bias with respect to the potential generated at the other end of the secondary coil during the ON period of the switching element.