JPH02129136U - - Google Patents
Info
- Publication number
- JPH02129136U JPH02129136U JP3671889U JP3671889U JPH02129136U JP H02129136 U JPH02129136 U JP H02129136U JP 3671889 U JP3671889 U JP 3671889U JP 3671889 U JP3671889 U JP 3671889U JP H02129136 U JPH02129136 U JP H02129136U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- circuit
- power supply
- collector
- alarm
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
第１図は本考案の好適な実施例を示す回路図、
第２図は本考案の従来例を示す回路図である。
１……駆動回路、１ａ……負端子、２……電源
、３……警報回路、３ａ……負端子、４……ツエ
ナーダイオード、５……第１のトランジスタ、７
……第２のトランジスタ。
FIG. 1 is a circuit diagram showing a preferred embodiment of the present invention;
FIG. 2 is a circuit diagram showing a conventional example of the present invention. DESCRIPTION OF SYMBOLS 1... Drive circuit, 1a... Negative terminal, 2... Power supply, 3... Alarm circuit, 3a... Negative terminal, 4... Zener diode, 5... First transistor, 7
...Second transistor.
Claims (1)
と、この駆動回路に設定値以上の電源の電圧が印
加されると警報を行う、電源の供給により駆動す
る警報回路と、前記設定値を定めるための、カソ
ードが前記電源に接続されるツエナーダイオード
と、このツエナーダイオードのアノードに抵抗を
介してベースを接続する第１のトランジスタと、
第１のトランジスタのコレクタにベースを接続す
る第２のトランジスタとを備え、前記電源と前記
警報回路の負端子とを第１のトランジスタのコレ
クタに接続し、かつ第２のトランジスタのコレク
タを前記駆動回路の負端子に接続したことを特徴
とする保護回路。 A drive circuit that drives an electrical device by supplying power; an alarm circuit that issues an alarm when a power supply voltage higher than a set value is applied to the drive circuit; and an alarm circuit that is driven by power supply; , a Zener diode whose cathode is connected to the power supply; a first transistor whose base is connected to the anode of the Zener diode via a resistor;
a second transistor whose base is connected to the collector of the first transistor, the power supply and the negative terminal of the alarm circuit are connected to the collector of the first transistor, and the collector of the second transistor is driven by the second transistor. A protection circuit characterized by being connected to the negative terminal of the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3671889U JPH02129136U (en) | 1989-03-30 | 1989-03-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3671889U JPH02129136U (en) | 1989-03-30 | 1989-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02129136U true JPH02129136U (en) | 1990-10-24 |
Family
ID=31543193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3671889U Pending JPH02129136U (en) | 1989-03-30 | 1989-03-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02129136U (en) |
-
1989
- 1989-03-30 JP JP3671889U patent/JPH02129136U/ja active Pending
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