JPH027737U - - Google Patents
Info
- Publication number
- JPH027737U JPH027737U JP8233988U JP8233988U JPH027737U JP H027737 U JPH027737 U JP H027737U JP 8233988 U JP8233988 U JP 8233988U JP 8233988 U JP8233988 U JP 8233988U JP H027737 U JPH027737 U JP H027737U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- reference voltage
- generates
- detection
- 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 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 1
Landscapes
- Protection Of Generators And Motors (AREA)
Description
第１図は本考案の一実施例を示す結線図、第２
図は同実施例の作用説明用の電圧波形図である。
また、第３図は従来例を示す第１図相当図である
。
図中、１１は電流検出回路、１２は変流器、１
６は制御用接点、１７は電圧発生回路、２１は比
較回路、２３は積分回路、２４は第１の補助電圧
発生回路、２８は補助比較回路、３１は第２の補
助電圧発生回路、３４は電圧変更用比較回路（電
圧変更回路）を示す。
Figure 1 is a wiring diagram showing one embodiment of the present invention, Figure 2 is a wiring diagram showing an embodiment of the present invention.
The figure is a voltage waveform diagram for explaining the operation of the same embodiment.
Further, FIG. 3 is a diagram corresponding to FIG. 1 showing a conventional example. In the figure, 11 is a current detection circuit, 12 is a current transformer, 1
6 is a control contact, 17 is a voltage generation circuit, 21 is a comparison circuit, 23 is an integration circuit, 24 is a first auxiliary voltage generation circuit, 28 is an auxiliary comparison circuit, 31 is a second auxiliary voltage generation circuit, 34 is a A voltage change comparison circuit (voltage change circuit) is shown.
Claims (1)
生する電流検出回路と、予め設定された過負荷電
流値に対応した基準電圧を発生する電圧発生回路
と、前記検出電圧及び基準電圧を比較する比較回
路とを備え、前記検出電圧が前記基準電圧を越え
た状態が所定時間継続されたときに過負荷検知信
号を発生するモータ電流検出回路において、前記
モータの電源投入後においてその突入電流により
上昇する前記検出電圧が補助基準電圧以下に収束
するまでの期間のみ待機信号を発生する補助比較
回路と、この補助比較回路から待機信号が出力さ
れた期間は前記電圧発生回路による基準電圧をこ
れより高い電圧レベルの始動時用基準電圧に変更
した状態を保持する電圧変更回路とを設けたこと
を特徴とするモータ電流検出回路。 A current detection circuit that generates a detection voltage according to the load current flowing through the motor, a voltage generation circuit that generates a reference voltage corresponding to a preset overload current value, and a comparison circuit that compares the detection voltage and the reference voltage. and a motor current detection circuit that generates an overload detection signal when the detected voltage exceeds the reference voltage for a predetermined period of time; An auxiliary comparator circuit that generates a standby signal only during the period until the detected voltage converges below the auxiliary reference voltage, and a voltage level higher than the reference voltage generated by the voltage generating circuit during the period when the standby signal is output from the auxiliary comparator circuit. 1. A motor current detection circuit comprising: a voltage change circuit that maintains a state changed to a reference voltage for starting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8233988U JPH027737U (en) | 1988-06-23 | 1988-06-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8233988U JPH027737U (en) | 1988-06-23 | 1988-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH027737U true JPH027737U (en) | 1990-01-18 |
Family
ID=31307097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8233988U Pending JPH027737U (en) | 1988-06-23 | 1988-06-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH027737U (en) |
-
1988
- 1988-06-23 JP JP8233988U patent/JPH027737U/ja active Pending
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