JPH0186478U - - Google Patents
Info
- Publication number
- JPH0186478U JPH0186478U JP17911087U JP17911087U JPH0186478U JP H0186478 U JPH0186478 U JP H0186478U JP 17911087 U JP17911087 U JP 17911087U JP 17911087 U JP17911087 U JP 17911087U JP H0186478 U JPH0186478 U JP H0186478U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- switching
- voltage
- switching transistor
- output
- 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.)
- Granted
Links
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図はこの考案の実施例に係るスイツチング
電源回路の構成図、第２図は従来のスイツチング
電源回路の構成図である。
Ｑ１……スイツチングトランジスタ、Ｑ２……
スイツチングトランジスタ制御用トランジスタ、
Ｑ３……誤差信号増幅用トランジスタ、Ｌ……チ
ヨークコイル、Ｃ……コンデンサ、Ｄ１，Ｄ２…
…電圧クランプ用ダイオード、Ｒ１……起動用抵
抗、Ａ……誤差検出回路、Ｂ２……定電流回路。
FIG. 1 is a block diagram of a switching power supply circuit according to an embodiment of this invention, and FIG. 2 is a block diagram of a conventional switching power supply circuit. Q1...Switching transistor, Q2...
Switching transistor control transistor,
Q3...Transistor for error signal amplification, L...Charcoal coil, C...Capacitor, D1, D2...
...voltage clamp diode, R1... starting resistance, A... error detection circuit, B2... constant current circuit.
Claims (1)
ツチングトランジスタと、このスイツチングトラ
ンジスタをオン・オフ動作させるスイツチングト
ランジスタ制御用トランジスタと、このスイツチ
ングトランジスタ制御用トランジスタのベース電
圧をクランプする電圧クランプ用ダイオードと、
前記スイツチングトランジスタのスイツチング出
力電圧を平滑するＬＣ平滑回路と、このＬＣ平滑
回路の出力電圧と所定の基準電圧との誤差を検出
し出力信号を送出する誤差検出回路と、この誤差
検出回路の出力信号によりオン・オフ動作する誤
差信号増幅用トランジスタと、入力部が前記誤差
信号増幅用トランジスタのコレクタに接続される
とともに入力電流が供給される起動用抵抗に接続
され、かつ出力部が前記スイツチングトランジス
タ制御用トランジスタのベースに接続されてなる
定電流回路とを備え、前記誤差信号増幅用トラン
ジスタのオフ時に前記起動用抵抗により供給され
た電流を定電流増幅し前記スイツチングトランジ
スタ制御用トランジスタに定電流を供給するよう
にしてなることを特徴とするスイツチング電源回
路。 A switching transistor that switches an unregulated DC input voltage, a switching transistor control transistor that turns this switching transistor on and off, and a voltage clamp diode that clamps the base voltage of this switching transistor control transistor. ,
an LC smoothing circuit that smoothes the switching output voltage of the switching transistor; an error detection circuit that detects an error between the output voltage of the LC smoothing circuit and a predetermined reference voltage and sends an output signal; and an output of the error detection circuit. an error signal amplification transistor that is turned on and off by a signal; an input part is connected to the collector of the error signal amplification transistor; the output part is connected to a starting resistor to which the input current is supplied; and an output part is connected to the switching transistor. a constant current circuit connected to the base of the transistor for controlling the transistor, the constant current circuit amplifies the current supplied by the starting resistor when the transistor for error signal amplification is turned off, and supplies the constant current to the transistor for controlling the switching transistor. A switching power supply circuit configured to supply current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17911087U JPH03870Y2 (en) | 1987-11-25 | 1987-11-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17911087U JPH03870Y2 (en) | 1987-11-25 | 1987-11-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0186478U true JPH0186478U (en) | 1989-06-08 |
| JPH03870Y2 JPH03870Y2 (en) | 1991-01-11 |
Family
ID=31470692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17911087U Expired JPH03870Y2 (en) | 1987-11-25 | 1987-11-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03870Y2 (en) |
-
1987
- 1987-11-25 JP JP17911087U patent/JPH03870Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03870Y2 (en) | 1991-01-11 |