JPH0233546U - - Google Patents
Info
- Publication number
- JPH0233546U JPH0233546U JP11293988U JP11293988U JPH0233546U JP H0233546 U JPH0233546 U JP H0233546U JP 11293988 U JP11293988 U JP 11293988U JP 11293988 U JP11293988 U JP 11293988U JP H0233546 U JPH0233546 U JP H0233546U
- Authority
- JP
- Japan
- Prior art keywords
- reference voltage
- circuit
- current
- output
- capacitor
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Protection Of Generators And Motors (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
第１図は本考案の実施例の基本ブロツク図、第
２図は第１図の実施例の具体例を示す回路図であ
る。
１……電動機、２……電動機駆動回路、３……
駆動信号発生回路、４……電流制御用スイツチ回
路、５……過電流検出回路、６……電流／電圧変
換回路、７……基準電圧発生回路、８……比較回
路、９……電流遮断指令回路、１０……タイマ用
コンデンサ、１１……充電回路、１２……放電回
路、１３……可変基準電圧発生回路、１４……比
較回路、１５……電流遮断実行回路、１６……信
号側路回路。
FIG. 1 is a basic block diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a specific example of the embodiment of FIG. 1...Electric motor, 2...Motor drive circuit, 3...
Drive signal generation circuit, 4...Switch circuit for current control, 5...Overcurrent detection circuit, 6...Current/voltage conversion circuit, 7...Reference voltage generation circuit, 8...Comparison circuit, 9...Current cutoff Command circuit, 10...Timer capacitor, 11...Charging circuit, 12...Discharging circuit, 13...Variable reference voltage generation circuit, 14...Comparison circuit, 15...Current cutoff execution circuit, 16...Signal side road circuit.
Claims (1)
から出力される駆動信号によりオンオフ制御され
て駆動電源から電動機へ供給される駆動電流を制
御する電流制御用スイツチ回路を含む電動機駆動
回路と、 前記駆動電流が予め設定した値以上になると過
電流検出信号を出力する過電流検出回路と、 前記過電流検出信号が所定時間以上出力され続
けると電流遮断指令信号を出力する電流遮断指令
回路と、 前記電流遮断指令信号が出力されている間前記
電動機への前記駆動電流の通電を遮断させる電流
遮断実行回路とを具備してなる電動機用過電流遮
断装置において、 前記電流遮断指令回路は、 タイマ用コンデンサと、 前記過電流検出信号が出力されている間前記コ
ンデンサを充電する充電回路と、 前記過電流検出信号の出力が停止されると前記
コンデンサを放電させる放電回路と、 出力する基準電圧を可変できる可変基準電圧発
生回路と、 前記コンデンサの端子電圧と前記基準電圧とを
比較する比較回路とを具備し、 前記コンデンサが充電される時に該コンデンサ
の端子電圧が第１の基準電圧以上になると前記比
較回路は前記電流遮断指令信号を出力し、前記コ
ンデンサが放電される時に該コンデンサの端子電
圧が第２の基準電圧以下になると前記比較回路は
前記電流遮断指令信号の出力を停止し、 前記可変基準電圧発生回路は前記電流遮断指令
信号が出力されると前記出力する基準電圧を前記
第１の基準電圧から第２の基準電圧に変更し、前
記電流遮断指令信号の出力が停止されると前記出
力する基準電圧を前記第２の基準電圧から第１の
基準電圧に変更することを特徴とする電動機用過
電流遮断装置。 (2) 前記駆動信号発生回路、過電流検出回路及
び電流遮断指令回路は前記駆動電源とは別に設け
られた制御電源を電源として作動する請求項１に
記載の電動機用過電流遮断装置。 (3) 前記電流遮断実行回路は前記電流遮断指令
信号に応じて前記駆動信号を側路する信号側路回
路を含む請求項１に記載の電動機用過電流遮断装
置。[Claims for Utility Model Registration] (1) A drive signal generation circuit and a current control switch circuit that is controlled on and off by the drive signal output from the drive signal generation circuit and controls the drive current supplied from the drive power source to the motor. an overcurrent detection circuit that outputs an overcurrent detection signal when the drive current exceeds a preset value; and an overcurrent detection circuit that outputs a current cutoff command signal when the overcurrent detection signal continues to be output for a predetermined time or more. an overcurrent interrupting device for a motor, comprising: a current interrupting command circuit that interrupts the current interrupting command; and a current interrupting circuit that interrupts the supply of the drive current to the motor while the current interrupting command signal is output. The cutoff command circuit includes a timer capacitor, a charging circuit that charges the capacitor while the overcurrent detection signal is being output, and a discharging circuit that discharges the capacitor when the output of the overcurrent detection signal is stopped. , a variable reference voltage generation circuit that can vary the output reference voltage, and a comparison circuit that compares the terminal voltage of the capacitor with the reference voltage, and when the capacitor is charged, the terminal voltage of the capacitor is the first voltage. When the voltage at the terminals of the capacitor becomes equal to or higher than the second reference voltage, the comparison circuit outputs the current cutoff command signal, and when the terminal voltage of the capacitor becomes lower than the second reference voltage when the capacitor is discharged, the comparison circuit outputs the current cutoff command signal. The variable reference voltage generation circuit changes the output reference voltage from the first reference voltage to the second reference voltage when the current cutoff command signal is output, and the variable reference voltage generation circuit changes the output reference voltage from the first reference voltage to the second reference voltage, and An overcurrent cutoff device for a motor, characterized in that when output is stopped, the reference voltage to be output is changed from the second reference voltage to the first reference voltage. (2) The overcurrent interrupting device for an electric motor according to claim 1, wherein the drive signal generation circuit, overcurrent detection circuit, and current interrupting command circuit operate using a control power source provided separately from the drive power source. (3) The overcurrent interrupt device for a motor according to claim 1, wherein the current interrupt execution circuit includes a signal bypass circuit that bypasses the drive signal in response to the current interrupt command signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988112939U JPH0756581Y2 (en) | 1988-08-29 | 1988-08-29 | Overcurrent breaker for electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988112939U JPH0756581Y2 (en) | 1988-08-29 | 1988-08-29 | Overcurrent breaker for electric motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0233546U true JPH0233546U (en) | 1990-03-02 |
| JPH0756581Y2 JPH0756581Y2 (en) | 1995-12-25 |
Family
ID=31352336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988112939U Expired - Lifetime JPH0756581Y2 (en) | 1988-08-29 | 1988-08-29 | Overcurrent breaker for electric motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0756581Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007259626A (en) * | 2006-03-24 | 2007-10-04 | Howa Mach Ltd | Drive unit of dc motor |
| JP2012070567A (en) * | 2010-09-24 | 2012-04-05 | Casio Comput Co Ltd | Current detection circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57106392A (en) * | 1980-11-03 | 1982-07-02 | Mannesmann Ag | Dc motor particularly for printing machine winding dc motor protecting circuit device |
-
1988
- 1988-08-29 JP JP1988112939U patent/JPH0756581Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57106392A (en) * | 1980-11-03 | 1982-07-02 | Mannesmann Ag | Dc motor particularly for printing machine winding dc motor protecting circuit device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007259626A (en) * | 2006-03-24 | 2007-10-04 | Howa Mach Ltd | Drive unit of dc motor |
| JP2012070567A (en) * | 2010-09-24 | 2012-04-05 | Casio Comput Co Ltd | Current detection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0756581Y2 (en) | 1995-12-25 |
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