JPH0472882U

JPH0472882U -

Info

Publication number: JPH0472882U
Application number: JP11629990U
Authority: JP
Priority date: 1990-11-06
Filing date: 1990-11-06
Publication date: 1992-06-26

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の回路図、第２図は
第１図のものの説明用の回路図、第３図は従来例
の回路図、第４図は第３図のものの作動特性を示
すグラフ、第５図は従来回路の他の例を示す回路
図である。２５……直流電源、２６……主スイツチ、２７
，３１……コンデンサ、２８，３０……ダイオー
ド、２９……補助スイツチ、３２……インダクタ
、３３……トランス、３４……一次側コイル、４
２……制御回路。 Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is an explanatory circuit diagram of the one shown in Fig. 1, Fig. 3 is a circuit diagram of a conventional example, and Fig. 4 is an operating characteristic of the one shown in Fig. 3. FIG. 5 is a circuit diagram showing another example of the conventional circuit. 25...DC power supply, 26...Main switch, 27
, 31... Capacitor, 28, 30... Diode, 29... Auxiliary switch, 32... Inductor, 33... Transformer, 34... Primary side coil, 4
2...Control circuit.

Claims

[Scope of utility model registration request]

In a switching power supply device in which the primary coil of a transformer and a main switch that is turned on and off under the control of a control circuit are connected in series to a DC power supply,
A regenerative current circuit consisting of a parallel circuit of an auxiliary switch and a diode, a series circuit of the parallel circuit and a capacitor, and an inductor that stores the regenerative current are connected to the primary coil side of the transformer, and the regenerative current is stored in the inductor. The switching power supply device is characterized in that the energy stored in the capacitor connected in parallel to the main switch is discharged by the energy stored in the main switch, and the main switch is turned on when the voltage across the main switch is zero.