JPH01162783U - - Google Patents
Info
- Publication number
- JPH01162783U JPH01162783U JP5701188U JP5701188U JPH01162783U JP H01162783 U JPH01162783 U JP H01162783U JP 5701188 U JP5701188 U JP 5701188U JP 5701188 U JP5701188 U JP 5701188U JP H01162783 U JPH01162783 U JP H01162783U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- power supply
- resistor
- whose
- pulse width
- 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
- 238000003079 width control Methods 0.000 claims description 3
- 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を示す回路図、第２
図及び第３図は従来例を示す回路図である。
１……パルス幅制御回路、３，４…保護回路、
Ｅ……入力電源、Ｑ１……トランジスタ、Ｑ２，
Ｑ３……トランジスタ、Ｒ３，Ｒ４……抵抗、Ｄ
ｚ……ツエナーダイオード。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
3 and 3 are circuit diagrams showing a conventional example. 1... Pulse width control circuit, 3, 4... Protection circuit,
E...Input power supply, Q1 ...Transistor, Q2 ,
Q3 ...Transistor, R3 , R4 ...Resistor, D
z...Zener diode.
Claims (1)
ス幅制御回路への給電を停止する入力電圧低下保
護回路を備えたスイツチング電源回路において、
該保護回路が、エミツタを入力電源に接続しコレ
クタをパルス幅制御回路に接続し、かつベースを
抵抗とツエナーダイオードの直列回路を介して接
地したトランジスタと、該トランジスタのベース
・エミツタ間に接続した抵抗で構成されているこ
とを特徴とするスイツチング電源回路。 In a switching power supply circuit equipped with an input voltage drop protection circuit that stops power supply to the pulse width control circuit when the input voltage drops below a predetermined value,
The protection circuit is connected between the base and emitter of the transistor and a transistor whose emitter is connected to an input power source, whose collector is connected to a pulse width control circuit, and whose base is grounded through a series circuit of a resistor and a Zener diode. A switching power supply circuit characterized by being composed of a resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5701188U JPH01162783U (en) | 1988-04-27 | 1988-04-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5701188U JPH01162783U (en) | 1988-04-27 | 1988-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01162783U true JPH01162783U (en) | 1989-11-13 |
Family
ID=31282867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5701188U Pending JPH01162783U (en) | 1988-04-27 | 1988-04-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01162783U (en) |
-
1988
- 1988-04-27 JP JP5701188U patent/JPH01162783U/ja active Pending