JPH0391025U - - Google Patents
Info
- Publication number
- JPH0391025U JPH0391025U JP15083089U JP15083089U JPH0391025U JP H0391025 U JPH0391025 U JP H0391025U JP 15083089 U JP15083089 U JP 15083089U JP 15083089 U JP15083089 U JP 15083089U JP H0391025 U JPH0391025 U JP H0391025U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- circuit
- voltage
- supply circuit
- diode
- 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
- 238000001514 detection method Methods 0.000 claims 3
- 230000007423 decrease Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Description
第１図は本考案の一実施例を示す電源の保護回
路の電気回路図である。
１，１１，１３，１６……ダイオード、２，４
，７，８，９，１０，１７……抵抗器、３，５…
…トランジスタ、６……ツエナーダイオード、１
２……レギユレータ回路、１４……２ｎｄコンバ
ータ、１５……出力端子、１８……切換器、１９
……電解コンデンサ。
FIG. 1 is an electrical circuit diagram of a power supply protection circuit showing an embodiment of the present invention. 1, 11, 13, 16...diode, 2, 4
, 7, 8, 9, 10, 17...Resistor, 3, 5...
...Transistor, 6...Zener diode, 1
2...Regulator circuit, 14...2nd converter, 15...Output terminal, 18...Switcher, 19
……Electrolytic capacitor.
Claims (1)
スタのスイツチ動作を利用した電源回路の遮断用
のスイツチ回路からなる電源回路において、前記
整流回路で整流された直流電圧を前記スイツチ回
路を介して直流電圧の供給回路に加え、前記直流
電圧の供給回路と前記スイツチ回路間とをダイオ
ードのカソード側が直流電圧の供給回路側になる
ように接続して検出手段とし、前記直流電圧の供
給回路の短絡による直流電圧低下を前記ダイオー
ドで検出して前記スイツチ回路を遮断せしめるこ
とを特徴とする電源の保護回路。 (2) 前記スイツチ回路が、第１トランジスタの
エミツタとベース間がバイアス用抵抗器でブリツ
ジされた回路と、第２トランジスタのコレクタに
負荷用抵抗器を接続し、同第２トランジスタのエ
ミツタとアノードがアースに接続されたツエナダ
イオードのカソードとを接続し、Ｂ電圧を第１及
び第２抵抗器で分割して同第２トランジスタのベ
ースにバイアス電圧を加えている回路からなり、
前記第１トランジスタのエミツタと前記整流回路
とを接続し、同第１トランジスタのコレクタと前
記直流電圧の供給回路とを接続し、同第１トラン
ジスタのベースを前記負荷用抵抗器を介して前記
第２トランジスタのコレクタに接続して、さらに
、前記直流電圧の供給回路と前記検出手段用のダ
イオードのカソード側とを接続し、同ダイオード
のアノード側を前記第２トランジスタのベースに
接続して、通常動作時はＢ電圧を第１及び第２抵
抗器で分割したバイアス電圧により第２トランジ
スタを導通せしめて、第２トランジスタに流れる
コレクタ電流により前記第１トランジスタのエミ
ツタとベース間をブリツジしたバイアス用抵抗器
にバイアス電圧を発生せしめて前記第１トランジ
スタを導通させて前記整流回路で整流された直流
電圧を前記直流電圧の供給回路に加え、前記直流
電圧の供給回路の短絡による直流電圧低下時、前
記検出手段用のダイオードで直流電圧の低下を検
出して前記第２トランジスタのベース電圧を低下
させて同第２トランジスタを遮断することにより
前記第１トランジスタを遮断せしめることを特徴
とする請求項(1)記載の電源の保護回路。[Claims for Utility Model Registration] (1) In a power supply circuit consisting of a rectifier circuit that rectifies a commercial power source and a switch circuit that interrupts the power supply circuit using the switching operation of a transistor, a DC voltage rectified by the rectifier circuit. is added to the DC voltage supply circuit via the switch circuit, and the DC voltage supply circuit and the switch circuit are connected such that the cathode side of the diode is on the DC voltage supply circuit side to serve as a detection means; A protection circuit for a power supply, characterized in that the diode detects a drop in DC voltage due to a short circuit in a DC voltage supply circuit and shuts off the switch circuit. (2) The switch circuit includes a circuit in which the emitter and base of the first transistor are bridged with a bias resistor, a load resistor is connected to the collector of the second transistor, and the emitter and the anode of the second transistor are connected to each other. is connected to the cathode of a Zener diode which is connected to ground, and consists of a circuit that divides the B voltage between first and second resistors and applies a bias voltage to the base of the second transistor.
The emitter of the first transistor is connected to the rectifier circuit, the collector of the first transistor is connected to the DC voltage supply circuit, and the base of the first transistor is connected to the first transistor through the load resistor. The DC voltage supply circuit is further connected to the cathode side of the diode for the detection means, and the anode side of the diode is connected to the base of the second transistor. During operation, the second transistor is made conductive by a bias voltage obtained by dividing the B voltage between the first and second resistors, and the bias resistor is bridged between the emitter and base of the first transistor by the collector current flowing through the second transistor. A bias voltage is generated in the device to make the first transistor conductive, and the DC voltage rectified by the rectifier circuit is applied to the DC voltage supply circuit, and when the DC voltage decreases due to a short circuit in the DC voltage supply circuit, the Claim (1) characterized in that the first transistor is cut off by detecting a drop in DC voltage with a diode for the detection means and lowering the base voltage of the second transistor to cut off the second transistor. ) protection circuit for the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15083089U JPH0391025U (en) | 1989-12-28 | 1989-12-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15083089U JPH0391025U (en) | 1989-12-28 | 1989-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0391025U true JPH0391025U (en) | 1991-09-17 |
Family
ID=31697162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15083089U Pending JPH0391025U (en) | 1989-12-28 | 1989-12-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0391025U (en) |
-
1989
- 1989-12-28 JP JP15083089U patent/JPH0391025U/ja active Pending
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