JPS61192687U - - Google Patents
Info
- Publication number
- JPS61192687U JPS61192687U JP7552585U JP7552585U JPS61192687U JP S61192687 U JPS61192687 U JP S61192687U JP 7552585 U JP7552585 U JP 7552585U JP 7552585 U JP7552585 U JP 7552585U JP S61192687 U JPS61192687 U JP S61192687U
- Authority
- JP
- Japan
- Prior art keywords
- output transistor
- detection resistor
- resistance value
- value
- primary side
- 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
- 238000001514 detection method Methods 0.000 claims description 9
- 238000009499 grossing Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案の一実施例に係る回路図、第２
図は従来例の回路図である。
ＡＣは交流電源、ＳＷは電源スイツチ、Ａは整
流平滑回路、Ｂは出力電圧形成回路、Ｃ１は入力
側平滑コンデンサ、Ｔ２はコンバータトランス、
Ｃ２は出力側平滑コンデンサ、Ｔｒ１は出力トラ
ンジスタ、ＣＴは制御回路、Ｒ１は第１検出抵抗
、Ｒ２は第２検出抵抗、Ｅは抵抗値切換制御回路
。
FIG. 1 is a circuit diagram according to an embodiment of the present invention, and FIG.
The figure is a circuit diagram of a conventional example. AC is an alternating current power supply, SW is a power switch, A is a rectifier smoothing circuit, B is an output voltage forming circuit, C1 is an input side smoothing capacitor, T2 is a converter transformer,
C2 is an output side smoothing capacitor, Tr1 is an output transistor, CT is a control circuit, R1 is a first detection resistor, R2 is a second detection resistor, and E is a resistance value switching control circuit.
Claims (1)
流平滑回路を接続し、該コンバータトランスの２
次側には負荷に対する出力電圧形成回路を接続し
、このコンバータトランスの１次側に出力トラン
ジスタのコレクタを接続するとともに、この出力
トランジスタのベースに該出力トランジスタのオ
ンオフ周期を制御する制御パルスを与える制御回
路を接続し、出力トランジスタのエミツタと接地
部との間には該出力トランジスタのコレクタ電流
の増大を検出する第１検出抵抗を接続してなるス
イツチングレギユレータにおいて、 前記第１検出抵抗とは別に前記出力トランジス
タのコレクタ電流の増大を検出する第２検出抵抗
を含みかつ該第２検出抵抗を前記第１検出抵抗に
並列に接続することにより出力トランジスタのエ
ミツタと接地間の検出抵抗値を切り換え制御する
抵抗値切換制御回路を備え、この抵抗値切換制御
回路は前記コンバータトランスの１次側に与えら
れる入力電圧が設定値以上のときは前記検出抵抗
値を所定値以上に切り換え、該入力電圧が設定値
未満のときはその前記検出抵抗値を所定値末満に
切り換えることを特徴とするスイツチングレギユ
レータ。[Claims for Utility Model Registration] A rectifying and smoothing circuit of an AC power supply is connected to the primary side of the converter transformer, and
An output voltage forming circuit for the load is connected to the next side, and the collector of the output transistor is connected to the primary side of this converter transformer, and a control pulse for controlling the on/off cycle of the output transistor is applied to the base of the output transistor. In a switching regulator, a switching regulator is connected to a control circuit, and a first detection resistor is connected between an emitter of an output transistor and a ground portion for detecting an increase in a collector current of the output transistor, wherein the first detection resistor In addition to this, a second detection resistor is included for detecting an increase in the collector current of the output transistor, and the second detection resistor is connected in parallel to the first detection resistor to determine the detection resistance value between the emitter of the output transistor and ground. The resistance value switching control circuit switches the detected resistance value to a predetermined value or more when the input voltage applied to the primary side of the converter transformer is a predetermined value or more. A switching regulator characterized in that when an input voltage is less than a set value, the detection resistance value is switched to a value less than a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7552585U JPH0340080Y2 (en) | 1985-05-20 | 1985-05-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7552585U JPH0340080Y2 (en) | 1985-05-20 | 1985-05-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61192687U true JPS61192687U (en) | 1986-11-29 |
| JPH0340080Y2 JPH0340080Y2 (en) | 1991-08-22 |
Family
ID=30616825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7552585U Expired JPH0340080Y2 (en) | 1985-05-20 | 1985-05-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0340080Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04117166A (en) * | 1990-09-06 | 1992-04-17 | Matsushita Electric Ind Co Ltd | Switching power supply |
-
1985
- 1985-05-20 JP JP7552585U patent/JPH0340080Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04117166A (en) * | 1990-09-06 | 1992-04-17 | Matsushita Electric Ind Co Ltd | Switching power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0340080Y2 (en) | 1991-08-22 |