JPH02138928U

JPH02138928U -

Info

Publication number: JPH02138928U
Application number: JP4940589U
Authority: JP
Priority date: 1989-04-26
Filing date: 1989-04-26
Publication date: 1990-11-20

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す一次側回路の
要部回路図、第２図は第１図の回路の波形図、第
３図は本考案をスイツチング電源に適用した場合
の具体例である。第４図及び第５図は従来装置の
一次側回路の要部回路図である。ｎ_１……一次巻線、ｎ_２１……駆動巻線、ｎ_２
２……バイアス巻線、Ｑ……スイツチング素子、
ＳＣ……可飽和リアクトル、Ｔ……トランス、α
……バツフア回路。 Fig. 1 is a circuit diagram of the main part of a primary circuit showing an embodiment of the present invention, Fig. 2 is a waveform diagram of the circuit of Fig. 1, and Fig. 3 is a specific example when the present invention is applied to a switching power supply. It is. FIGS. 4 and 5 are circuit diagrams of main parts of the primary side circuit of the conventional device. n ₁ ...Primary winding, n ₂₁ ... Drive winding, n _{2
2} ...bias winding, Q...switching element,
SC...Saturable reactor, T...Transformer, α
...Batsuhua circuit.

Claims

[Claims for Utility Model Registration] A transformer having a primary winding n1 into which a control signal is input, a drive winding n21 and a bias winding n22 coupled to this primary winding; A buffer circuit that outputs an on/off signal corresponding to the control signal sent from the primary side is connected to this bias winding through a saturable reactor, and rectifies and smoothes the signal corresponding to the control signal sent from the primary side. , a rectifying and smoothing circuit that supplies an operating voltage to the buffer circuit, and a switching element comprising a MOSFET that is controlled by an on/off signal sent from the buffer circuit.