JPS61426U - coil protection circuit - Google Patents
coil protection circuitInfo
- Publication number
- JPS61426U JPS61426U JP8449084U JP8449084U JPS61426U JP S61426 U JPS61426 U JP S61426U JP 8449084 U JP8449084 U JP 8449084U JP 8449084 U JP8449084 U JP 8449084U JP S61426 U JPS61426 U JP S61426U
- Authority
- JP
- Japan
- Prior art keywords
- coil
- transistor
- protection circuit
- current
- fuse
- 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
- Dot-Matrix Printers And Others (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
図面は本考案にかかり、第１図はコイル保護回路の一例
を示すブロック図、第２図はこの回路の主一部における
電圧、電流の波形を示すタイムチャートである。
図中、Ｔｒ１はスイッチング用のトランジスタ、Ｔｒ２
は過電流用のトランジスタ、１０は異常検出回路、Ｌは
コチル、１１はコイル電流、１２は切断電流、Ｐはヒュ
ーズ、Ｓ１は駆動信号、Ｃはコンデンサ、Ｒ１〜Ｒ３は
抵抗を示す。The drawings relate to the present invention, and FIG. 1 is a block diagram showing an example of a coil protection circuit, and FIG. 2 is a time chart showing voltage and current waveforms in the main part of this circuit. In the figure, Tr1 is a switching transistor, Tr2
10 is an overcurrent transistor, 10 is an abnormality detection circuit, L is a coil current, 11 is a coil current, 12 is a cutting current, P is a fuse, S1 is a drive signal, C is a capacitor, and R1 to R3 are resistances.
Claims (1)
に直列接続されたスイッチング用のトランジスタとを含
み、該トランジスタに駆動信号を供給することにより該
コイルに飽和電流を供給する構成において、前記トラン
ジスタに対して過電流用のトランジスタを並列に接続す
るとともに、前記コイルに連続して一定時間以上飽和電
流が供給されたことを検出する異常検出回路を設け、該
異常検出回路によって異常が検出された時に前記過電流
用のトランジスタを導通状態とすることにより前記飽和
電流以上の電流をヒューズに流すことを特徴とするコイ
ル保護回路。A configuration including a coil connected to a power source via a fuse, and a switching transistor connected in series to the coil, and supplying a saturation current to the coil by supplying a drive signal to the transistor, the transistor An overcurrent transistor is connected in parallel to the coil, and an abnormality detection circuit is provided to detect that a saturated current is continuously supplied to the coil for a certain period of time or more, and an abnormality is detected by the abnormality detection circuit. 1. A coil protection circuit characterized in that the overcurrent transistor is turned on at times to cause a current higher than the saturation current to flow through the fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8449084U JPS61426U (en) | 1984-06-07 | 1984-06-07 | coil protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8449084U JPS61426U (en) | 1984-06-07 | 1984-06-07 | coil protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61426U true JPS61426U (en) | 1986-01-06 |
Family
ID=30634049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8449084U Pending JPS61426U (en) | 1984-06-07 | 1984-06-07 | coil protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61426U (en) |
-
1984
- 1984-06-07 JP JP8449084U patent/JPS61426U/en active Pending
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