JPS63172288U

JPS63172288U -

Info

Publication number: JPS63172288U
Application number: JP6411387U
Authority: JP
Priority date: 1987-04-30
Filing date: 1987-04-30
Publication date: 1988-11-09

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す回路図、第２
図はその動作を示す各部波形図、第３図は従来の
スイツチング電源の一例を示す回路図、第４図は
第３図の動作を示す各部波形図、第５図は本考案
の効果を説明するための入力電圧と出力電圧との
関係を示す特性図である。１……スイツチングトランジスタ、３……ツエ
ナーダイオード、４，６，１１，１６……コンデ
ンサ、７……直列回路、９，１２，１５……ダイ
オード、１４……パルストランス、１７，１８，
１９……巻線。 Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a waveform diagram of each part showing its operation, Figure 3 is a circuit diagram showing an example of a conventional switching power supply, Figure 4 is a waveform diagram of various parts showing the operation of Figure 3, and Figure 5 explains the effects of the present invention. FIG. 3 is a characteristic diagram showing the relationship between input voltage and output voltage for the purpose of achieving the desired output voltage. 1... Switching transistor, 3... Zener diode, 4, 6, 11, 16... Capacitor, 7... Series circuit, 9, 12, 15... Diode, 14... Pulse transformer, 17, 18,
19... Winding wire.

Claims

[Scope of utility model registration request]

A pulse transformer having a switching transistor, a primary winding, a secondary winding, and a control winding, the primary winding being connected to a DC power supply via the transistor, and a reverse polarity output voltage of the secondary winding. an output circuit that rectifies and supplies DC power to the load, a startup circuit that supplies base current from the DC power source via a resistor, and a series circuit of a capacitor and a resistor from the forward polarity output voltage of the control winding. a base input circuit that supplies a base current through a control capacitor that is charged via a diode from the reverse polarity output voltage of the control winding; and a control capacitor that is electrically connected when the charging voltage of the control capacitor exceeds a predetermined value. In a single-stone flyback type switching power supply equipped with a Zener diode that applies a reverse bias voltage to the base of the transistor and makes the transistor non-conductive, a series circuit of a capacitor and a resistor in the base input circuit includes a diode and a resistor. A switching power supply characterized by connecting series circuits in parallel in the direction in which the base current flows.