JPS58139896U

JPS58139896U - flyback converter

Info

Publication number: JPS58139896U
Application number: JP3699682U
Authority: JP
Inventors: 章雄小根森
Original assignee: 三菱電機株式会社
Priority date: 1982-03-16
Filing date: 1982-03-16
Publication date: 1983-09-20

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図は従来のフライバックコンバータラ示ス、　回路
図、第２図は第１図の回路の動作を示す波形図、第３図
は第１図の回路の動作を示す波形図、第３図は第１図の
回路の入力電圧と出力電圧の関係図、第４図はこの考案
の一実施例を示す回路図、第５図は第４図の回路におけ
る入力電圧と出力電圧の関係を示す図、第６図はこの考
案の他の実施例を示す回路図である。図において、１は入力電源、２は電力変換用トランス、
４はスイッチングトランジスタ、３．６及び１７は各々
トランス２の一次巻線、ベース巻線及び二次巻線、５は
コレクタ電流検出用抵抗、１２はバイアス用抵抗、１３
と１８は整流用ダイオード、１４と１９は平滑用キャパ
シタ、１５はホトカプラそして２０は負荷である。なお
各図中同一符号は同−又は相当部分を示す。１／胤→ １辺→Figure 1 shows a conventional flyback converter circuit diagram, Figure 2 is a waveform diagram showing the operation of the circuit in Figure 1, Figure 3 is a waveform diagram showing the operation of the circuit in Figure 1, and Figure 3 is a waveform diagram showing the operation of the circuit in Figure 1. The figure shows the relationship between the input voltage and the output voltage of the circuit in Figure 1, Figure 4 is a circuit diagram showing an embodiment of this invention, and Figure 5 shows the relationship between the input voltage and output voltage in the circuit in Figure 4. The figure shown in FIG. 6 is a circuit diagram showing another embodiment of this invention. In the figure, 1 is an input power supply, 2 is a power conversion transformer,
4 is a switching transistor; 3.6 and 17 are the primary winding, base winding and secondary winding of the transformer 2, respectively; 5 is a collector current detection resistor; 12 is a bias resistor; 13
and 18 are rectifying diodes, 14 and 19 are smoothing capacitors, 15 is a photocoupler, and 20 is a load. Note that the same reference numerals in each figure indicate the same or equivalent parts. 1/ Seed→ 1 side→

Claims

[Scope of utility model registration request]

A switching transistor, a transformer whose collector is connected to the primary winding and whose base is connected to the base winding, and a transformer whose collector is connected to the base winding, and which is connected to the secondary winding of this transformer, which receives the stored energy from the transformer when the switching transistor is cut off. In a flyback converter composed of a diode and a capacitor that take out the voltage, a circuit for comparing the output voltage supplied to the load with a reference voltage, an element for insulating feedback of this error amount to the base circuit of the switching transistor, an element that detects a collector current of the switching transistor; and a base control circuit that receives driving power from the winding of the transformer when the switching transistor is cut off and controls a base current that is supplied to the switching transistor. flyback converter.