JPH02193592A - Overcurrent detection system for motor - Google Patents
Overcurrent detection system for motorInfo
- Publication number
- JPH02193592A JPH02193592A JP1011158A JP1115889A JPH02193592A JP H02193592 A JPH02193592 A JP H02193592A JP 1011158 A JP1011158 A JP 1011158A JP 1115889 A JP1115889 A JP 1115889A JP H02193592 A JPH02193592 A JP H02193592A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- comparator
- transistor
- overcurrent detection
- voltage
- 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
- 238000001514 detection method Methods 0.000 title claims description 25
- 238000004804 winding Methods 0.000 claims abstract description 18
- 238000010586 diagram Methods 0.000 description 8
- 241000218645 Cedrus Species 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Control Of Direct Current Motors (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
モータの過電流検出方式の改良に関し、装置の安全性を
考慮してモータ等の過電流検出抵抗をｖｃｃ側に接続し
た場合における高精度な過電流検出方式を提供すること
を目的とし、モータ巻線と、下端が巻線の上端に接続さ
れ上端が電源に接続された過電流検出抵抗と、巻線に流
れる電流をオン／オフするスイッチ手段と、電源とアー
スの間に直列接続された第１．２．３の抵抗と、カソー
ド側が電流検出抵抗の下端に接続されアノード側が第１
の抵抗の下端に接続されたダイオードと、電源とアース
の間に直列接続された第４．５．６の抵抗と、＋側入力
が第５の抵抗と第６の抵抗の接合点に接続され一例入力
が第２の抵抗と第３の抵抗の接合点に接続された演算増
幅器と、ベースが演算増幅器の出力に接続されエミッタ
が抵抗Ｒ１を介してアースされコレクタが第４の抵抗と
第５の抵抗の接合点に接続されたトランジスタと、一方
の入力が抵抗ＲＡの上端に接続され他方の入力が基準電
圧に接続されたコンパレータとを具備している。[Detailed Description of the Invention] [Summary] Regarding the improvement of the motor overcurrent detection method, a highly accurate overcurrent detection method is provided when the overcurrent detection resistor of the motor, etc. is connected to the vcc side in consideration of the safety of the device. The object of the present invention is to provide a motor winding, an overcurrent detection resistor whose lower end is connected to the upper end of the winding and whose upper end is connected to a power supply, a switch means for turning on/off the current flowing through the winding, and a power supply. and ground, and the cathode side is connected to the lower end of the current detection resistor, and the anode side is connected to the first resistor.
a diode connected to the lower end of the resistor, a 4.5.6 resistor connected in series between the power supply and ground, and the + side input connected to the junction of the 5th resistor and the 6th resistor. An example is an operational amplifier whose input is connected to the junction of a second resistor and a third resistor, whose base is connected to the output of the operational amplifier, whose emitter is grounded through a resistor R1, and whose collector is connected to a fourth resistor and a fifth resistor. and a comparator having one input connected to the upper end of the resistor RA and the other input connected to a reference voltage.
本発明は、モータの過電流検出方式の改良に関するもの
である。The present invention relates to an improvement in a motor overcurrent detection method.
第３図は従来のモータの過電流検出方式の電気回路図で
ある。同図において、Ｒ３は電流検出抵抗、Ｍはパルス
・モータの巻線、Ｔｒはトランジスタ、Ｄ、はダイオー
ド、Ｒ１ないしＲｃは抵抗、■、、。、は基準電圧、１
はコンパレータをそれぞれ示している。FIG. 3 is an electrical circuit diagram of a conventional motor overcurrent detection method. In the figure, R3 is a current detection resistor, M is a pulse motor winding, Tr is a transistor, D is a diode, and R1 to Rc are resistors. , is the reference voltage, 1
indicate the comparators, respectively.
トランジスタＴｒがオンすると、抵抗Ｒ８及び巻線Ｍに
電流が流れると共に、抵抗Ｒ，及びダイオードＤ、を通
って電流が流れる。抵抗Ｒ，に電流が流れると、Ａ点の
電圧は降下する。Ａ点の電圧はコンパレータ１の非反転
入力に印加され、コンパレータ１の反転入力には基準電
圧Ｖ ｒｔａｆが印加されている。コンパレータ１の非
反転入力電圧が反転入力電圧より低くなると、コンパレ
ータｌは低レベルを出力する。When the transistor Tr is turned on, current flows through the resistor R8 and the winding M, and at the same time, current flows through the resistor R and the diode D. When current flows through resistor R, the voltage at point A drops. The voltage at point A is applied to the non-inverting input of comparator 1, and the reference voltage V rtaf is applied to the inverting input of comparator 1. When the non-inverting input voltage of comparator 1 becomes lower than the inverting input voltage, comparator 1 outputs a low level.
第４図は従来のモータの過電流検出方式の電流。Figure 4 shows the current of the conventional motor overcurrent detection method.
電圧波形を示す図である。同図において、ｉｌは巻線Ｍ
に流れる電流を示す。また、点線は電源電圧Ｖ ｃｃが
降下した場合のＡ点の電圧を示す。FIG. 3 is a diagram showing voltage waveforms. In the figure, il is the winding M
Indicates the current flowing in Furthermore, the dotted line indicates the voltage at point A when the power supply voltage Vcc drops.
巻線電流ｉ、が流れないない時のＡ点の電圧は、ｖｃｃ
ｘＲｅ ／ （Ｒ−十Ｒｂ ＋Ｒｅ ）で表される。ト
ランジスタＴｒがオン／オフすると、巻線電流ｉ、は図
示のように変化する。巻線Ｍに電流１１が流れた時のＡ
点の電圧は、（Ｖｃｃ ｉ ＋ Ｒｓ ） ｘＲｃ
／ ＣＲｂ ＋Ｒｅ ）で表される。The voltage at point A when winding current i does not flow is vcc
It is expressed as xRe/(R-10Rb+Re). When the transistor Tr turns on/off, the winding current i changes as shown. A when current 11 flows through winding M
The voltage at the point is (Vcc i + Rs) xRc
/CRb+Re).
〔発明が解決しようとする課題］
第３図に示す従来のモータの過電流検出方式においては
、巻線の電流値がＲ−、Ｒｈ 、Ｒｃから成る抵抗の分
圧値により検出されることから、電源電圧Ｖ ｃｃの変
動がそのまま検出誤差になる欠点を有している。[Problems to be Solved by the Invention] In the conventional motor overcurrent detection method shown in FIG. , it has the disadvantage that fluctuations in the power supply voltage Vcc directly result in detection errors.
本発明は、この点に鑑みて創作されたものであって、装
置の安全性を考慮した場合、モータ等の過電流検出抵抗
はＶ ｃｃ側に接続するのが好ましく、そうした場合に
おける高精度な過電流検出方式を提供することを目的と
している。The present invention was created in view of this point, and when considering the safety of the device, it is preferable to connect the overcurrent detection resistor of the motor etc. to the Vcc side. The purpose is to provide an overcurrent detection method.
第１図は本発明のモータの過電流検出方式の電気回路図
である。同図において、Ｒ，は過電流検出抵抗、Ｍはモ
ータ巻線、ＴｒＩはトランジスタ、Ｄｌはダイオード、
Ｒ１ないしＲ，は抵抗、Ｔ。FIG. 1 is an electrical circuit diagram of a motor overcurrent detection method according to the present invention. In the same figure, R is an overcurrent detection resistor, M is a motor winding, TrI is a transistor, Dl is a diode,
R1 to R are resistances, T.
はトランジスタ、ＲＡは抵抗、Ｖ ｒａｆは基準電圧、
１はコンパレータ、２は演算増幅器（以下、ＯＰアンプ
と言う）をそれぞれ示している。is a transistor, RA is a resistor, V raf is a reference voltage,
1 indicates a comparator, and 2 indicates an operational amplifier (hereinafter referred to as OP amplifier).
本発明においては、Ｒ，＝Ｒ，，Ｒ２＝Ｒ６゜Ｒ３＝Ｒ
６、Ｒ３（Ｒ，、Ｒ１＜ （ＲＺ ＋Ｒ３）と設定され
ている。トランジスタＴ ｒ Ｉがオンすると、抵抗Ｒ
ｓと巻線Ｍに電流が流れると共に、抵抗Ｒ１とダイオー
ドＤ、を通って電流が流れる。In the present invention, R,=R,,R2=R6゜R3=R
6, R3 (R,, R1< (RZ +R3). When the transistor T r I is turned on, the resistor R
A current flows through the resistor R1 and the diode D as well as through the resistor R1 and the diode D.
抵抗Ｒ＋ 、Ｒｚ 、Ｒ３は直列接続され、抵抗Ｒ２と
抵抗Ｒ３の接合点はＯＰアンプ２の一人力に接続されて
いる。また、抵抗Ｒａ 、Ｒｓ 、Ｒｈも直列接続され
、抵抗Ｒ１と抵抗Ｒ６の接合点はＯＰアンプ２の十人力
に接続されている。ＯＰアンプ２の出力はトランジスタ
Ｔ＋、２のベースに接続されている。トランジスタＴ、
のコレクタは抵抗Ｒ４とＲｓの接合点に接続され、トラ
ンジスタＴ、、２のエミッタは抵抗ＲＡを介してアース
されている。Resistors R+, Rz, and R3 are connected in series, and the junction point of resistor R2 and resistor R3 is connected to the single power of the OP amplifier 2. Further, the resistors Ra, Rs, and Rh are also connected in series, and the junction of the resistors R1 and R6 is connected to the terminal of the OP amplifier 2. The output of the OP amplifier 2 is connected to the base of the transistor T+,2. transistor T,
The collector of is connected to the junction of resistors R4 and Rs, and the emitter of transistor T, 2 is grounded via resistor RA.
ＯＰアンプ２とトランジスタＴ、、２を第１図のように
配置することにより、電流検出抵抗Ｒ，に電流１１が流
れた場合、Ｖ、＝Ｖ２となる。このように、抵抗ＲＡの
両端には電流ｔ ｌの大きさに比例した電圧■４が生じ
ることになる。電圧ｖヶがコンパレータ１の反転入力に
印加され、基準電圧■１’ｌｌｆがコンパレータｌの非
反転入力に印加され、前者の電圧が後者の電圧以上にな
ると、コンパレータ１は低レベルを出力する。なお、抵
抗Ｒ１ないしＲ５は前述のように設定されているため、
電源電圧の変動の影響を受けない。By arranging the OP amplifier 2 and the transistors T, 2 as shown in FIG. 1, when a current 11 flows through the current detection resistor R, V,=V2. In this way, a voltage 4 proportional to the magnitude of the current tl is generated across the resistor RA. A voltage v is applied to the inverting input of the comparator 1, a reference voltage 1'llf is applied to the non-inverting input of the comparator l, and when the former voltage exceeds the latter voltage, the comparator 1 outputs a low level. Note that since the resistors R1 to R5 are set as described above,
Not affected by power supply voltage fluctuations.
第２図は本発明のモータの過電流検出方式の電流、電圧
波形を示す図である。トランジスタＴ、。FIG. 2 is a diagram showing current and voltage waveforms of the motor overcurrent detection method of the present invention. Transistor T.
がオンすると、図示のように巻線Ｍを流れる電流１１は
増大し、トランジスタＴ、、、をオフすると、図示のよ
うに電２ｉｔｉｌは減少する。巻線電流の増加／減少に
伴って電圧Ｖ、、Ｖ２は図示のように変化する。電圧Ｖ
、、Ｖ２が変化すると電圧■１は図示のように変化する
。When transistors T, . . . are turned on, the current 11 flowing through the winding M increases as shown, and when transistors T, . As the winding current increases/decreases, the voltages V, , V2 change as shown. Voltage V
,, When V2 changes, voltage 1 changes as shown.
以上の説明から明らかなように、本発明によれば、電源
電圧等の変動の影響を受けることなく高精度なモータ電
流値の検出を容易に実現可能であり、装置の安全性確保
に大きく寄与するものである。As is clear from the above description, according to the present invention, it is possible to easily detect the motor current value with high precision without being affected by fluctuations in the power supply voltage, etc., and it greatly contributes to ensuring the safety of the device. It is something to do.
第１図は本発明のモータの過電流検出方式の電気回路図
、第２図は本発明のモータの過電流検出方式の電流、電
圧波形を示す図、第３図は従来のモータの過電流検出方
式を示す図、第４図は従来のモータの過電流検出方式の
電流、電圧波形を示す図である。
Ｒ５・・・過電流検出抵抗、Ｍ・・・モータの巻線、Ｔ
□・・・トランジスタ、Ｄ、・・・ダイオード、Ｒ１−
Ｒ６・・・抵抗、Ｔｒ２・・・トランジスタ、ＲＡ・・
・抵抗、■ｒａｆ・・・基準電圧、１・・・コンパレー
タ、２・・・演算増幅器。
特許出願人 株式会社ピーエフニー代理人弁理士
京 谷 四 部
本発明のモーフの蓮艶沃メ史七す弐つ電気回葉−兄第１
図
従来のモータの逼里〉も倹巴カ氏
第３図
第２図
ゆり艮つモータの遁覧焼ノ剣ありパン１乙流」２圧朗υ
杉第４図Fig. 1 is an electric circuit diagram of the motor overcurrent detection method of the present invention, Fig. 2 is a diagram showing current and voltage waveforms of the motor overcurrent detection method of the present invention, and Fig. 3 is a diagram showing the overcurrent of the conventional motor. FIG. 4 is a diagram showing the current and voltage waveforms of a conventional motor overcurrent detection method. R5...Overcurrent detection resistor, M...Motor winding, T
□...Transistor, D,...Diode, R1-
R6...Resistor, Tr2...Transistor, RA...
・Resistance, ■raf...Reference voltage, 1...Comparator, 2...Operation amplifier. Patent applicant Patent attorney representing Pfn Co., Ltd.
Kyo Tani Part 4 The present invention's morph's lotus luster production history seven two electric cycles - older brother 1st
Figure 3: Figure 2: The conventional motor with a sword
Cedar figure 4
Claims (1)
された過電流検出抵抗（Ｒ＿Ｓ）と、巻線（Ｍ）に流れ
る電流をオン／オフするスイッチ手段（Ｔ＿ｒ＿１）と
、 電源とアースの間に直列接続された３個の抵抗（Ｒ＿１
，Ｒ＿２，Ｒ＿３）と、 カソード側が過電流検出抵抗（Ｒ＿Ｓ）の下端に接続さ
れ、アノード側が抵抗（Ｒ＿１）の下端に接続されたダ
イオード（Ｄ＿１）と、 電源とアースの間に直列接続された３個の抵抗（Ｒ＿４
，Ｒ＿５，Ｒ＿６）と、 ＋側入力が抵抗（Ｒ＿５）と抵抗（Ｒ＿６）の接合点に
接続され、−側入力が抵抗（Ｒ＿２）と抵抗（Ｒ＿３）
の接合点に接続された演算増幅器（２）と、 ベースが演算増幅器（２）の出力に接続され、エミッタ
が抵抗（Ｒ＿Ａ）を介してアースされ、コレクタが抵抗
（Ｒ＿４）と抵抗（Ｒ＿５）の接合点に接続されたトラ
ンジスタ（Ｔ＿ｒ＿２）と、 一方の入力が抵抗（Ｒ＿Ａ）の上端に接続され、他方の
入力が基準電圧（Ｖ＿ｒ＿ｅ＿ｆ）に接続されたコンパ
レータ（１）と を具備することを特徴とするモータの過電流検出方式。[Claims] A motor winding (M), an overcurrent detection resistor (R_S) whose lower end is connected to the upper end of the winding (M) and whose upper end is connected to a power supply, and a current flowing through the winding (M). A switch means (T_r_1) that turns on/off the current, and three resistors (R_1) connected in series between the power supply and ground.
, R_2, R_3), a diode (D_1) whose cathode side is connected to the lower end of the overcurrent detection resistor (R_S) and whose anode side is connected to the lower end of the resistor (R_1), and a diode (D_1) connected in series between the power supply and ground. 3 resistors (R_4
, R_5, R_6), the + side input is connected to the junction of the resistor (R_5) and the resistor (R_6), and the - side input is connected to the junction of the resistor (R_2) and the resistor (R_3).
The base is connected to the output of the operational amplifier (2), the emitter is grounded through the resistor (R_A), and the collector is connected to the resistor (R_4) and the resistor (R_5). and a comparator (1) whose one input is connected to the upper end of the resistor (R_A) and whose other input is connected to the reference voltage (V_r_e_f). Features a motor overcurrent detection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011158A JPH0648919B2 (en) | 1989-01-20 | 1989-01-20 | Motor overcurrent detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011158A JPH0648919B2 (en) | 1989-01-20 | 1989-01-20 | Motor overcurrent detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02193592A true JPH02193592A (en) | 1990-07-31 |
| JPH0648919B2 JPH0648919B2 (en) | 1994-06-22 |
Family
ID=11770224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1011158A Expired - Fee Related JPH0648919B2 (en) | 1989-01-20 | 1989-01-20 | Motor overcurrent detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0648919B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308391A (en) * | 2019-06-07 | 2019-10-08 | 横店集团英洛华电气有限公司 | A kind of low cost current of electric Acquisition Circuit and its acquisition method |
-
1989
- 1989-01-20 JP JP1011158A patent/JPH0648919B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308391A (en) * | 2019-06-07 | 2019-10-08 | 横店集团英洛华电气有限公司 | A kind of low cost current of electric Acquisition Circuit and its acquisition method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0648919B2 (en) | 1994-06-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |