JPS607689U

JPS607689U - DC-DC converter power supply starting circuit

Info

Publication number: JPS607689U
Application number: JP9933283U
Authority: JP
Inventors: 佐藤　光勇; 喜則臼井
Original assignee: 富士通株式会社
Priority date: 1983-06-29
Filing date: 1983-06-29
Publication date: 1985-01-19
Anticipated expiration: 1998-06-29
Also published as: JPH069584Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来形の給電回路を用いたＤＣ−ＤＣコンバー
タの回路図、第２図は本考案の第１の実施例としてのＤ
Ｃ−ＤＣコンバータの給電起動回路を用いたＤＣ−ＤＣ
コンバータの回路図、第３図ａは時間に対する入力電圧
の変化を示す特性図、第３図すは第２図の回路において
第３図ａのような入力電圧変化に対するトランジスタ回
路の入力および出力における電圧の変化を示す特性図、
第４図は本考案の第２の実施例を用いたＤＣ−ＤＣコン
バータめ回路図、および第５図は本考案の第３の実施例
を用いたＤＣ−ＤＣコンバータの回路図である。１１・・・・・・抵抗、１２・・・・・・制御回路、１
３・・・・・・変圧器、１４・・・・・・トランジスタ
、１５・・−Ｕ流回路、１６・・・・・・負荷、２１・
・・・・・抵抗、２２・・・・・・キャパシタ、２３・
・・・・・トランジスタ回路、２４・・・・・・キャパ
シタ、２５・・・・・・整流器、２６・・・・・・抵抗
、２７・・・・・・変圧器、２８・・・・・・変圧器の
一次巻線、２９・・・・・・変圧器の第１の二次巻線、
３０・・・・・・変圧器の第２の二次巻線、３１・・・
・・・トランジスタ回路、３２・・曲トランジスタ回路
、３４−−−−−−　トランジスタ、Ｄ・・・・・・定
電圧ダイオード、Ｒ１，Ｒ２，Ｒ３，Ｒ４゜Ｒ５，Ｒ１
１，Ｒ１２，Ｒ１３・・・・・・抵抗器、ＴＲｌ　。ＴＲ２，ＴＲ３，ＴＲ５，ＴＲ７・・川・トランジスタ
。Figure 1 is a circuit diagram of a DC-DC converter using a conventional power supply circuit, and Figure 2 is a circuit diagram of a DC-DC converter using a conventional power supply circuit.
DC-DC using power supply starting circuit of C-DC converter
A circuit diagram of the converter, Fig. 3a is a characteristic diagram showing the change in input voltage with respect to time, Fig. 3 is a characteristic diagram showing the change in input voltage with respect to time, and Fig. Characteristic diagram showing changes in voltage,
FIG. 4 is a circuit diagram of a DC-DC converter using a second embodiment of the present invention, and FIG. 5 is a circuit diagram of a DC-DC converter using a third embodiment of the present invention. 11...Resistor, 12...Control circuit, 1
3...Transformer, 14...Transistor, 15...-U flow circuit, 16...Load, 21...
...Resistance, 22...Capacitor, 23.
...Transistor circuit, 24...Capacitor, 25...Rectifier, 26...Resistor, 27...Transformer, 28... ...Primary winding of the transformer, 29...First secondary winding of the transformer,
30... Second secondary winding of the transformer, 31...
... Transistor circuit, 32 ... Curved transistor circuit, 34 --- Transistor, D ... Constant voltage diode, R1, R2, R3, R4゜R5, R1
1, R12, R13...Resistor, TRl. TR2, TR3, TR5, TR7... river transistor.

Claims

[Scope of utility model registration request]

Connect one terminal of the input DC power source to the other terminal of the input DC power source via the primary winding of the transformer and the chopping transistor, and connect the output of the first secondary winding of the transformer to the rectifier circuit. DC-D connected to the load through
In the power supply startup circuit of the C converter, a series circuit of a resistor and a capacitor is connected across the input DC power supply, and a transistor circuit is connected to the circuit that becomes conductive and self-maintains when the voltage between the terminals of the capacitor exceeds a certain value. A second secondary winding is inserted between the connection point of the resistor and the capacitor and one of the power supply terminals of the control circuit, a second secondary winding is provided in the transformer, and the output of the second secondary winding is connected to a rectifier circuit. connecting the other of the power supply terminals of the control circuit to the other terminal of the input DC power supply through t1, thereby operating the control circuit by conduction and self-holding of the transistor circuit; A power supply starting circuit for a DC-DC converter, characterized in that after the control circuit is activated, the control circuit receives power supply from a second secondary winding of the transformer.