JPH02129182U - - Google Patents
Info
- Publication number
- JPH02129182U JPH02129182U JP3643789U JP3643789U JPH02129182U JP H02129182 U JPH02129182 U JP H02129182U JP 3643789 U JP3643789 U JP 3643789U JP 3643789 U JP3643789 U JP 3643789U JP H02129182 U JPH02129182 U JP H02129182U
- Authority
- JP
- Japan
- Prior art keywords
- output terminal
- control transistor
- constant voltage
- power supply
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案による電源回路の一実施例を示
す回路図、第２図は第１図の電源回路のスイツチ
ング回路部に供給される起動タイミング信号を示
す波形図、第３図は従来の電源回路の回路図であ
る。
Ｃ１……平滑コンデンサ、Ｃ３……コンデンサ
、ＣＴ……調圧トランス、Ｄ……ダイオード、Ｄ
Ｂ……ダイオードブリツジ、Ｆ……過電流保護用
のヒユーズ、Ｌ１，Ｌ２……負荷、ＰＳ……交流
電源、Ｑ１……制御用トランジスタ、Ｑ２……誤
差増幅器、Ｑ３，Ｑ４……トランジスタ、Ｒ１，
Ｒ４，Ｒ５，Ｒ６，Ｒ７……抵抗、Ｒ２，Ｒ３…
…検出用抵抗、Ｓ……起動タイミング信号、ＶＺ
……ツエナダイオード。
FIG. 1 is a circuit diagram showing an embodiment of the power supply circuit according to the present invention, FIG. 2 is a waveform diagram showing a start-up timing signal supplied to the switching circuit section of the power supply circuit of FIG. 1, and FIG. FIG. 3 is a circuit diagram of a power supply circuit. C1... Smoothing capacitor, C3... Capacitor, CT... Voltage regulating transformer, D... Diode, D
B...Diode bridge, F...Fuse for overcurrent protection, L1, L2...Load, PS...AC power supply, Q1...Control transistor, Q2...Error amplifier, Q3, Q4...Transistor, R1,
R4, R5, R6, R7...Resistance, R2, R3...
...Detection resistor, S...Start timing signal, VZ
...Zena diode.
Claims (1)
トランジスタを直列に接続し、基準電圧に対する
定電圧出力端子の電圧変動誤差を誤差増幅器で増
幅し、この誤差増幅器の出力を上記制御用トラン
ジスタのベースに供給することで定電圧出力端子
の端子電圧を安定化する電源回路において、上記
整流出力端子側がアノードとなるダイオードを介
して該整流出力端子に一端が接続されるとともに
他端が接地されるコンデンサと、このコンデンサ
の一端と上記制御用トランジスタのベース側との
間に接続されスイツチ制御信号の入力時に導通す
るスイツチ回路とを有し、上記整流出力端子に接
続される負荷の起動時に起動タイミング信号をス
イツチ制御信号として上記スイツチ回路に供給す
ることを特徴とする電源回路。 A control transistor is connected in series between the rectifier output terminal and the constant voltage output terminal, the voltage fluctuation error of the constant voltage output terminal with respect to the reference voltage is amplified by an error amplifier, and the output of this error amplifier is connected to the control transistor. In a power supply circuit that stabilizes the terminal voltage of a constant voltage output terminal by supplying it to a base, one end is connected to the rectified output terminal via a diode whose anode is the rectified output terminal side, and the other end is grounded. It has a capacitor and a switch circuit that is connected between one end of this capacitor and the base side of the control transistor and becomes conductive when a switch control signal is input, and the start timing is set when the load connected to the rectified output terminal is started. A power supply circuit characterized in that the signal is supplied to the switch circuit as a switch control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3643789U JPH02129182U (en) | 1989-03-31 | 1989-03-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3643789U JPH02129182U (en) | 1989-03-31 | 1989-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02129182U true JPH02129182U (en) | 1990-10-24 |
Family
ID=31542663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3643789U Pending JPH02129182U (en) | 1989-03-31 | 1989-03-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02129182U (en) |
-
1989
- 1989-03-31 JP JP3643789U patent/JPH02129182U/ja active Pending