JPH0171987U - - Google Patents
Info
- Publication number
- JPH0171987U JPH0171987U JP1987166770U JP16677087U JPH0171987U JP H0171987 U JPH0171987 U JP H0171987U JP 1987166770 U JP1987166770 U JP 1987166770U JP 16677087 U JP16677087 U JP 16677087U JP H0171987 U JPH0171987 U JP H0171987U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- transistor
- voltage divider
- emitter
- divides
- 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
- Protection Of Static Devices (AREA)
- Dc-Dc Converters (AREA)
Description
第１図は本考案の実施例を示す回路図、第２図
は従来例の回路図である。
１……直流電源、２……主変圧器、３……トラ
ンジスタ、１１，１２……抵抗器、１３……シヤ
ントレギユレータ。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional example. 1... DC power supply, 2... Main transformer, 3... Transistor, 11, 12... Resistor, 13... Shunt regulator.
Claims (1)
タを過電圧から保護する回路において、前記トラ
ンジスタのコレクタ・エミツタ間電圧を分圧する
分圧器と、該分圧器の分圧電圧が所定値以上にな
つたとき前記トランジスタのベースをエミツタへ
接続する手段とを備えたことを特徴とする過電圧
保護回路。 A circuit that protects a switching transistor of a switching power supply from overvoltage includes a voltage divider that divides the voltage between the collector and emitter of the transistor, and a voltage divider that divides the voltage between the collector and emitter of the transistor, and a voltage divider that divides the base of the transistor into the emitter when the divided voltage of the voltage divider exceeds a predetermined value. An overvoltage protection circuit comprising: means for connecting to the overvoltage protection circuit;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987166770U JPH0171987U (en) | 1987-11-02 | 1987-11-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987166770U JPH0171987U (en) | 1987-11-02 | 1987-11-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0171987U true JPH0171987U (en) | 1989-05-15 |
Family
ID=31454450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987166770U Pending JPH0171987U (en) | 1987-11-02 | 1987-11-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0171987U (en) |
-
1987
- 1987-11-02 JP JP1987166770U patent/JPH0171987U/ja active Pending