JPS6376922U - - Google Patents
Info
- Publication number
- JPS6376922U JPS6376922U JP16999286U JP16999286U JPS6376922U JP S6376922 U JPS6376922 U JP S6376922U JP 16999286 U JP16999286 U JP 16999286U JP 16999286 U JP16999286 U JP 16999286U JP S6376922 U JPS6376922 U JP S6376922U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- semiconductor element
- resistor
- series
- circuit
- 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
- 239000004065 semiconductor Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図はその動作特性図、第３図は従来例を示す回路
図、第４図はその動作特性図である。
１１……入力端子、１２……出力端子、１３…
…第１トランジスタ（第１半導体素子）、１８…
…オペアンプ、２０……第２トランジスタ（第２
半導体素子）、２１……分圧回路、２４……フオ
トカプラ、２５……フオトダイオード（スイツチ
素子）、２６……定電圧ダイオード（定電圧素子
）、１４，２２……抵抗、３０……発光ダイオー
ド。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
3 is a circuit diagram showing a conventional example, and FIG. 4 is a diagram showing its operating characteristics. 11...Input terminal, 12...Output terminal, 13...
...first transistor (first semiconductor element), 18...
...Operational amplifier, 20...Second transistor (second
Semiconductor element), 21... Voltage dividing circuit, 24... Photo coupler, 25... Photo diode (switch element), 26... Constant voltage diode (constant voltage element), 14, 22... Resistor, 30... Light emitting diode .
Claims (1)
１半導体素子１３と、出力電圧の変動を検出して
該出力電圧が一定となるように第１半導体素子１
３を駆動する第２半導体素子２０と、第１半導体
素子１３と直列に接続された抵抗１４と、出力電
圧を分圧する分圧回路２１と、前記抵抗１４の両
端電圧から分圧回路２１の一方の抵抗２２の両端
電圧を引いた電圧により駆動され、出力電流が一
定値以上となつた時に第１半導体素子１３への駆
動電流を分流させる第３半導体素子２７とを備え
た定電圧電源回路における過電流保護回路におい
て、分圧回路２１の抵抗２２に、出力電流が一定
値以上となつた時にオン状態を保持するスイツチ
素子２５を直列に接続すると共に、これら抵抗２
２とスイツチ素子２５とに並列に定電圧素子２６
を接続したことを特徴とする定電圧電源回路にお
ける過電流保護回路。 A first semiconductor element 13 connected in series between input and output terminals 11 and 12;
3, a resistor 14 connected in series with the first semiconductor element 13, a voltage divider circuit 21 that divides the output voltage, and one of the voltage dividers 21 from the voltage across the resistor 14. In a constant voltage power supply circuit, the third semiconductor element 27 is driven by a voltage obtained by subtracting the voltage across the resistor 22, and the third semiconductor element 27 shunts the drive current to the first semiconductor element 13 when the output current exceeds a certain value. In the overcurrent protection circuit, a switch element 25 that maintains an on state when the output current exceeds a certain value is connected in series with the resistor 22 of the voltage divider circuit 21, and these resistors 2
A constant voltage element 26 is connected in parallel to 2 and the switch element 25.
An overcurrent protection circuit in a constant voltage power supply circuit, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16999286U JPH0537288Y2 (en) | 1986-11-05 | 1986-11-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16999286U JPH0537288Y2 (en) | 1986-11-05 | 1986-11-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6376922U true JPS6376922U (en) | 1988-05-21 |
| JPH0537288Y2 JPH0537288Y2 (en) | 1993-09-21 |
Family
ID=31104302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16999286U Expired - Lifetime JPH0537288Y2 (en) | 1986-11-05 | 1986-11-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0537288Y2 (en) |
-
1986
- 1986-11-05 JP JP16999286U patent/JPH0537288Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0537288Y2 (en) | 1993-09-21 |