JPH01109240U - - Google Patents
Info
- Publication number
- JPH01109240U JPH01109240U JP228088U JP228088U JPH01109240U JP H01109240 U JPH01109240 U JP H01109240U JP 228088 U JP228088 U JP 228088U JP 228088 U JP228088 U JP 228088U JP H01109240 U JPH01109240 U JP H01109240U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- transistor
- comparison
- base
- inrush current
- 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
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims 3
- 238000009499 grossing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
- Dc-Dc Converters (AREA)
Description
第１図は本考案のスイツチング式電源回路の保
護装置の一実施例を示す回路図である。
１１……電源入力端子、１２……基準電位端子
、２０……突入電流制限回路、３０……入力電圧
検出回路、３１……定電圧回路、４０……駆動回
路、Ｔ１……コンバータトランス、Ｑ１〜Ｑ３…
…トランジスタ、Ｑ４……スイツチングトランジ
スタ、Ｃ，Ｃ１……コンデンサ、Ｒ１，Ｒ２……
ブリーダ抵抗、Ｒ３〜Ｒ７……抵抗、Ｖｒｅｆ…
…比較用基準電圧。
FIG. 1 is a circuit diagram showing an embodiment of the switching type power supply circuit protection device of the present invention. 11... Power supply input terminal, 12... Reference potential terminal, 20... Inrush current limiting circuit, 30... Input voltage detection circuit, 31... Constant voltage circuit, 40... Drive circuit, T1... Converter transformer, Q1 ~Q3...
...Transistor, Q4...Switching transistor, C, C1...Capacitor, R1, R2...
Bleeder resistance, R3 to R7...Resistance, Vref...
...Reference voltage for comparison.
Claims (1)
、 この電源入力端子に接続して設けられ、前記直
流電源が投入された時の突入電流を制限する突入
電流制限回路と、 この突入電流制限回路を経た入力電圧を分圧回
路を通してベースに供給しエミツタに供給される
基準電圧と比較し、入力電圧が一定値以下である
時コレクタに比較信号を出力する比較用トランジ
スタと、この比較用トランジスタのベースと基準
電位点間にコレクタ・エミツタ路を接続し、ベー
スに前記比較信号を供給し、前記比較用トランジ
スタの動作にヒステリシス性を持たせる為のトラ
ンジスタと、前記比較用トランジスタのベースと
前記突入電流制限回路の出力端間に接続して電源
投入時に前記比較用トランジスタの比較動作を停
止させる為のコンデンサとを含んで構成される入
力電圧検出回路と、 前記突入電流制限回路を通した入力電圧を平滑
用コンデンサを通してコンバータトランスの１次
側巻線に供給しこの１次側巻線に直列に接続した
スイツチングトランジスタのオン、オフによつて
交流に変換し、２次側巻線に得られる電圧を整流
して直流出力電圧を得るものであつて、且つ前記
スイツチングトランジスタのベースにスイツチン
グパルスを供給しそのパルス供給が前記入力電圧
検出回路からの比較信号に基づいて停止するよう
制御される駆動回路を有したスイツチング式電源
回路とを具備したことを特徴とするスイツチング
式電源回路の保護装置。[Claims for Utility Model Registration] A power input terminal to which an output is supplied from a DC power supply, and an inrush current limiting circuit that is connected to the power input terminal and limits the inrush current when the DC power supply is turned on. and a comparison transistor that supplies the input voltage that has passed through the inrush current limiting circuit to the base through the voltage divider circuit, compares it with the reference voltage supplied to the emitter, and outputs a comparison signal to the collector when the input voltage is below a certain value. and a transistor for connecting a collector-emitter path between the base of the comparison transistor and a reference potential point, supplying the comparison signal to the base, and giving hysteresis to the operation of the comparison transistor; an input voltage detection circuit configured to include a capacitor connected between the base of the inrush current limiting circuit and the output terminal of the inrush current limiting circuit to stop the comparison operation of the comparison transistor when power is turned on; The input voltage passed through the limiting circuit is supplied to the primary winding of the converter transformer through a smoothing capacitor, and converted to AC by turning on and off a switching transistor connected in series with this primary winding. It rectifies the voltage obtained at the next winding to obtain a DC output voltage, and supplies a switching pulse to the base of the switching transistor, and the pulse supply is used as a comparison signal from the input voltage detection circuit. 1. A protection device for a switching type power supply circuit, comprising: a switching type power supply circuit having a drive circuit that is controlled to stop based on the switching type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP228088U JPH01109240U (en) | 1988-01-11 | 1988-01-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP228088U JPH01109240U (en) | 1988-01-11 | 1988-01-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01109240U true JPH01109240U (en) | 1989-07-24 |
Family
ID=31202910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP228088U Pending JPH01109240U (en) | 1988-01-11 | 1988-01-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01109240U (en) |
-
1988
- 1988-01-11 JP JP228088U patent/JPH01109240U/ja active Pending
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