JPH084390B2 - Electronic governor - Google Patents
Electronic governorInfo
- Publication number
- JPH084390B2 JPH084390B2 JP62019410A JP1941087A JPH084390B2 JP H084390 B2 JPH084390 B2 JP H084390B2 JP 62019410 A JP62019410 A JP 62019410A JP 1941087 A JP1941087 A JP 1941087A JP H084390 B2 JPH084390 B2 JP H084390B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- voltage
- mirror circuit
- resistor
- motor
- 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.)
- Expired - Fee Related
Links
Landscapes
- Control Of Direct Current Motors (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、電子ガバナに係り、特に、回転数（回転
速度）の切換えに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic governor, and more particularly to switching of rotational speed (rotational speed).
電子ガバナは、直流モータの回転数の制御をトランジ
スタなどを用いて行う速度制御装置であって、この電子
ガバナには実開昭58−22894号「直流モータの速度制御
装置」など、多数の出願がある。An electronic governor is a speed control device that controls the rotation speed of a DC motor by using a transistor or the like. For this electronic governor, there are many applications such as Japanese Utility Model Laid-Open No. 58-22894 "DC motor speed control device". There is.
第２図は、従来の電子ガバナの一例を示す。これは、
回転制御を行う主回路部２をICで構成し、モータ４とと
もに、抵抗６、８、10が端子12、14、16に外付けされて
いる。電源端子18と接地端子20との間に、正電源が接続
され、この正電源は端子22を通して誤差増幅器24に加え
られている。FIG. 2 shows an example of a conventional electronic governor. this is,
The main circuit section 2 for controlling rotation is composed of an IC, and resistors 6, 8, 10 are externally attached to terminals 12, 14, 16 together with the motor 4. A positive power supply is connected between the power supply terminal 18 and the ground terminal 20, and this positive power supply is applied to the error amplifier 24 through the terminal 22.
モータ４には、トランジスタ26および抵抗28を通して
駆動電流が流れるが、この駆動電流は、モータ４の内部
抵抗raのＫ倍の抵抗値に設定された抵抗６、トランジス
タ26に対して電流比を1/Kに設定されたトランジスタ30
および抵抗32によって検出される。電圧源34には、定電
流源36の定電流によって、モータ４の回転数を設定する
基準電圧Vrefを発生させる。A driving current flows through the motor 4 through the transistor 26 and the resistor 28. This driving current has a current ratio of 1 with respect to the resistor 6 and the transistor 26, which are set to a resistance value K times the internal resistance ra of the motor 4. Transistor 30 set to / K
And detected by resistor 32. The voltage source 34 generates a reference voltage V ref for setting the rotation speed of the motor 4 by the constant current of the constant current source 36.
そして、この基準電圧Vrefの抵抗38、40による分圧電
圧値と、抵抗８、10の分圧点（端子14）から得られる検
出電圧とを誤差増幅器24に加えて両者の偏差値を求め、
その偏差値に応じた制御電流をトランジスタ30、26のベ
ースに流し込んでモータ４の駆動電流を制御し、モータ
４の速度制御が行われるのである。Then, the divided voltage value of the reference voltage V ref by the resistors 38 and 40 and the detection voltage obtained from the voltage dividing point (terminal 14) of the resistors 8 and 10 are added to the error amplifier 24 to obtain the deviation value between them. ,
A control current corresponding to the deviation value is flown into the bases of the transistors 30 and 26 to control the drive current of the motor 4 to control the speed of the motor 4.
ところで、この電子ガバナをテープレコーダなどに用
いて倍速ダビングなど、モータ４の回転数Ｎをたとえ
ば、N1、N2（N2＝2N1:2倍速）に変更する場合、抵抗
８、10の抵抗値R1、R2の比R1/R2を設定速度に対応して
変更すればよい。By the way, when the rotation speed N of the motor 4 is changed to, for example, N 1 or N 2 (N 2 = 2N 1 : 2 times speed) by using this electronic governor in a tape recorder or the like, for example, double speed dubbing, the resistances 8 and 10 are changed. The ratio R 1 / R 2 of the resistance values R 1 and R 2 may be changed according to the set speed.
このような２倍速回転を行う場合、たとえば、抵抗８
を一定値に設定し、抵抗10に対して破線で示すような別
の抵抗11を並列に接続して抵抗値の変更を行う。このた
め、速度切換えのために２本の抵抗10、11および接続切
換えの手段が必要であり、抵抗10、11の温度変化が回転
数に影響するとともに、外付け部品が多くなるなどの欠
点がある。When such double speed rotation is performed, for example, a resistor 8
Is set to a constant value and another resistance 11 as shown by a broken line is connected to the resistance 10 in parallel to change the resistance value. For this reason, two resistors 10 and 11 and a means for switching the connection are required for speed switching, and the temperature change of the resistors 10 and 11 affects the number of revolutions, and the number of external parts increases. is there.
そこで、この発明は、このような外付け部品を削減
し、IC内部で速度変更を可能にし、外付け部品の温度特
性の影響を回避しようとするものである。Therefore, the present invention is intended to reduce the number of such external parts, enable speed change inside the IC, and avoid the influence of the temperature characteristics of the external parts.
この発明の電子ガバナは、第１図に例示するように、
モータ44に直列に接続されて駆動電流を流す第１のトラ
ンジスタ54と、前記モータの内部抵抗に対応した抵抗値
を持つ第１の抵抗62に直列に接続されて前記駆動電流に
対応する動作電流を流し、前記第１の抵抗に第１の電圧
VTを生じさせる第２のトランジスタ64と、定電流を受け
て基準電圧Vrefを発生する電圧源80と、この電圧源が発
生した前記基準電圧を電流に変換する電圧・電流変換手
段（電圧・電流変換回路85）と、この電圧・電流変換手
段が発生した基準電流を受けて第１及び第２の基準電流
（I1、I2）を発生する第１の電流ミラー回路98と、動作
が外部から選択的に切り換えられ、動作状態のとき、前
記第１の電流ミラー回路から前記第１の基準電流を受
け、前記第２の基準電流から前記第１の基準電流を引き
込み、遮断状態のとき、前記第１の基準電流の引き込み
を停止する第２の電流ミラー回路104と、この第２の電
流ミラー回路の出力側に側路を成して併設され、前記第
２の電流ミラー回路が動作状態にあるとき、前記第２の
基準電流から前記第１の基準電流の差電流を引き込み、
また、前記第２の電流ミラー回路が遮断状態にあると
き、前記第２の基準電流を引き込む第３の電流ミラー回
路116と、この第３の電流ミラー回路によって与えられ
る前記差電流又は前記第２の基準電流に応じた値の第２
の電圧（V1又はV2）を生じさせる第２の抵抗68と、この
第２の抵抗に生じた前記第２の電圧を受け、前記第１の
抵抗に生じている前記第１の電圧に加算させるバッファ
回路72と、前記第１及び第２の電圧の加算値と前記モー
タに生じた逆起電力とを比較し、その差電圧に応じてベ
ース電流を前記第１及び第２のトランジスタのベースに
流す比較手段（比較器74）とを備えて、前記第２の電圧
が前記第２の電流ミラー回路の動作切換えによって基準
電流の値が変更されることにより、前記モータの回転数
（N1又はN2）を切り換えるようにしたものである。The electronic governor of the present invention, as illustrated in FIG.
A first transistor 54 connected in series to the motor 44 to flow a drive current, and a first resistor 62 having a resistance value corresponding to the internal resistance of the motor connected in series to an operating current corresponding to the drive current. Flowing a first voltage across the first resistor.
A second transistor 64 for generating V T , a voltage source 80 for receiving a constant current to generate a reference voltage Vref, and a voltage / current conversion means (voltage / current conversion means for converting the reference voltage generated by this voltage source into a current). The operation of the current conversion circuit 85) and the first current mirror circuit 98 which receives the reference current generated by the voltage / current conversion means to generate the first and second reference currents (I 1 , I 2 ) When selectively switched from the outside and in the operating state, the first reference current is received from the first current mirror circuit, the first reference current is drawn from the second reference current, and in the cutoff state , The second current mirror circuit 104 for stopping the drawing of the first reference current and the second current mirror circuit are provided side by side on the output side of the second current mirror circuit, and the second current mirror circuit operates. When in the state, from the second reference current to the first Draw the difference between current of the quasi-current,
Also, when the second current mirror circuit is in the cutoff state, a third current mirror circuit 116 that draws in the second reference current, and the difference current or the second current provided by the third current mirror circuit. The second value according to the reference current of
Second resistor 68 that causes a voltage (V 1 or V 2 ) of the second resistor and the second voltage that is generated at the second resistor, and receives the first voltage that is generated at the first resistor. The buffer circuit 72 for adding is compared with the added value of the first and second voltages and the counter electromotive force generated in the motor, and the base current is supplied to the first and second transistors according to the difference voltage. The reference voltage is changed by switching the operation of the second current mirror circuit so that the second voltage is changed to the rotation speed (N) of the motor. 1 or N 2 ) is switched.
したがって、この電子ガバナでは、制御入力端子108
に特定の電位（V1、V2）を設定するのみ、スイッチング
手段（トランジスタ106）を切り換え、予め設定されて
いる基準電流（I1、I2）を集積回路（主回路部46）の内
部で変更することができ、従来、抵抗（第２図の抵抗1
0、11）などの外付け部品が不要となる。Therefore, in this electronic governor, the control input terminal 108
Only by setting a specific potential (V 1 , V 2 ) to the switching means (transistor 106), the preset reference currents (I 1 , I 2 ) are set inside the integrated circuit (main circuit portion 46). It can be changed with the conventional resistance (resistor 1 in Fig. 2
No external parts such as 0, 11) are required.
第１図は、この発明の電子ガバナの実施例を示す。 FIG. 1 shows an embodiment of the electronic governor of the present invention.
モータ44の駆動電流を制御する主回路部46はICで構成
されている。モータ44は、電源端子48と主回路部46のモ
ータ端子50との間に接続され、電源端子48と接地端子52
との間に加えられた正電源によって駆動され、その駆動
電流は第１のトランジスタ54および抵抗56を通して流れ
る。The main circuit section 46 that controls the drive current of the motor 44 is composed of an IC. The motor 44 is connected between the power supply terminal 48 and the motor terminal 50 of the main circuit section 46, and has a power supply terminal 48 and a ground terminal 52.
Driven by a positive power supply applied between the two, and its drive current flows through the first transistor 54 and the resistor 56.
端子58、60に接続された第１の抵抗62は、モータ44の
内部抵抗raに対して電流比Ｋ倍の抵抗値を持っており、
第２のトランジスタ64および抵抗66には、トランジスタ
54に流れる駆動電流の1/Kの電流が流れる。抵抗66に
は、トランジスタ54に流れる電流により、第１の電圧VT
が発生する。The first resistor 62 connected to the terminals 58 and 60 has a resistance value of a current ratio K times the internal resistance ra of the motor 44,
The second transistor 64 and the resistor 66 include a transistor
1 / K of the driving current flowing in 54 flows. The resistor 66 receives the first voltage V T due to the current flowing through the transistor 54.
Occurs.
そこで、この電子ガバナでは、端子67に接続された速
度調整用抵抗68に電流設定手段としての定電流回路70で
形成した第１または第２の基準電流I1、I2を第２の抵抗
68に流し、抵抗68に得られた第２の電圧V1、V2と、トラ
ンジスタ64を通して流れる電流によって抵抗62に発生し
た第１の電圧VTとをバッファ回路72を構成する演算増幅
器73によって加え合わせ、この加え合わせて得られた電
圧値（V1＋VT,V2＋VT）と、モータ44に発生する逆起電
力とを誤差増幅器としての比較器74で比較し、両者の差
電圧に応じた制御電流を各トランジスタ64、54のベース
に流し込み、モータ44の速度制御とともに、必要な回転
数、たとえばN1、N2の設定を行う。たとえば、基準電流
I1のとき、回転数をN1、基準電流I2のとき、回転数をN2
とすると、倍速度設定（N2＝2N1）では、I2＝2I1に設定
する。Therefore, in this electronic governor, the first or second reference current I 1 or I 2 formed by the constant current circuit 70 as the current setting means is applied to the speed adjusting resistor 68 connected to the terminal 67 with the second resistor.
The second voltages V 1 and V 2 which are applied to the resistor 68 and are applied to the resistor 68, and the first voltage V T generated in the resistor 62 due to the current flowing through the transistor 64 are controlled by the operational amplifier 73 which constitutes the buffer circuit 72. In addition, the voltage value (V 1 + V T , V 2 + V T ) obtained by this addition and the back electromotive force generated in the motor 44 are compared by a comparator 74 as an error amplifier, and the difference voltage between them is compared. A control current corresponding to the above is applied to the bases of the transistors 64 and 54 to control the speed of the motor 44 and set the required number of rotations, for example N 1 and N 2 . For example, the reference current
The rotation speed is N 1 when I 1 , and the rotation speed N 2 when reference current is I 2.
Then, in the double speed setting (N 2 = 2N 1 ), I 2 = 2I 1 is set.
ところで、基準電流I1、I2を定電流回路70に発生させ
るため、端子76に加えられた電源電圧VCCに応じて定電
流源78から定電流を電圧源80に流し込んで、温度係数を
持たない基準電圧Vrefを発生させ、この基準電圧Vrefを
演算増幅器82およびトランジスタ84からなる電圧・電流
変換回路85に加えて、端子86に外付けされた基準抵抗88
が持つ温度係数に応じた温度変化をする基準電流I1を形
成する。この基準電流I1は、トランジスタ90、92、94、
96からなる第１の電流ミラー回路98に流し、トランジス
タ92を通してトランジスタ100、102からなる第２の電流
ミラー回路104に流す。ここで、トランジスタ90に対し
てトランジスタ92、94、100、102のエミッタ面積比（電
流能力）を1:1、また、トランジスタ96のエミッタ面積
比を1:2に設定する。すなわち、第１の基準電流としてI
1、第２の基準電流としてI2（＝2I1）が設定される。By the way, in order to generate the reference currents I 1 and I 2 in the constant current circuit 70, a constant current is supplied from the constant current source 78 to the voltage source 80 according to the power supply voltage V CC applied to the terminal 76, and the temperature coefficient is A reference voltage V ref that does not have is generated, and this reference voltage V ref is added to the voltage / current conversion circuit 85 including the operational amplifier 82 and the transistor 84, and the reference resistor 88 externally attached to the terminal 86.
A reference current I 1 that changes in temperature in accordance with the temperature coefficient of is formed. This reference current I 1 is applied to the transistors 90, 92, 94,
The current is supplied to the first current mirror circuit 98 composed of 96, and is supplied to the second current mirror circuit 104 composed of the transistors 100 and 102 through the transistor 92. Here, the emitter area ratio (current capacity) of the transistors 92, 94, 100, and 102 with respect to the transistor 90 is set to 1: 1, and the emitter area ratio of the transistor 96 is set to 1: 2. That is, I as the first reference current
1 , I 2 (= 2I 1 ) is set as the second reference current.
そして、電流ミラー回路104のトランジスタ100のベー
ス側に電流ミラー回路104の動作を切り換えるスイッチ
ング手段として、トランジスタ94からの定電流によって
駆動されるトランジスタ106を設置し、このトランジス
タ106のベースに速度調整用の制御入力端子108を設け
て、制御入力端子108に制御電位切換えのための電位切
換手段としてスイッチ110を設ける。この実施例では、
スイッチ110を用いて制御電位として、接地電位V1と解
放電位V2とを選択的に切り換えている。トランジスタ9
6、102から流れる基準電流I1またはI2は、定電流回路70
の出力回路として設置されたトランジスタ112、114から
なる第３の電流ミラー回路116から抵抗68に流れる。Then, a transistor 106 driven by a constant current from the transistor 94 is provided as a switching means for switching the operation of the current mirror circuit 104 on the base side of the transistor 100 of the current mirror circuit 104, and the speed adjustment is provided at the base of the transistor 106. The control input terminal 108 is provided, and the control input terminal 108 is provided with the switch 110 as the potential switching means for switching the control potential. In this example,
The switch 110 is used to selectively switch the ground potential V 1 and the release potential V 2 as the control potential. Transistor 9
The reference current I 1 or I 2 flowing from 6, 102 is the constant current circuit 70.
The current flows from the third current mirror circuit 116 including the transistors 112 and 114 provided as the output circuit of the resistor to the resistor 68.
そこで、スイッチ110の切換えで制御入力端子108に対
して接地電位V1が設定された場合、トランジスタ106が
遮断状態となる。トランジスタ90に流れる基準電流I
1は、電流ミラー効果によってトランジスタ92、94、96
に流れ、トランジスタ96には基準電流I1の２倍の電流I2
（＝2I1）が流れる。このとき、トランジスタ106が遮断
状態にあるため、電流ミラー回路104が動作状態とな
り、トランジスタ92に流れる基準電流I1は、電流ミラー
回路104に流れてトランジスタ96に流れる電流2I1からト
ランジスタ102を通して電源I1を引き込む。このため、
電流ミラー回路116には、基準電流I1（＝2I1−I1）が流
れ、この基準電流I1がトランジスタ114を通して速度調
整用抵抗68に流れ、速度調整用抵抗68に電圧V1が発生す
る。このとき、基準抵抗88および速度調整用抵抗68の抵
抗値をRK、RSとすると、モータ44の回転数N1は、 N1＝（1/Km）・（Vref・RS/RK） ・・・（１） となる。ただし、1/Kmは、モータ44によって定まる逆起
電力定数である。Therefore, when the ground potential V 1 is set to the control input terminal 108 by switching the switch 110, the transistor 106 is turned off. Reference current I flowing in transistor 90
1 is a transistor 92, 94, 96 due to the current mirror effect.
The current I 2 which is twice the reference current I 1
(= 2I 1 ) flows. At this time, since the transistor 106 is in the cutoff state, the current mirror circuit 104 is in an operating state, and the reference current I 1 flowing in the transistor 92 is supplied from the current 2I 1 flowing in the current mirror circuit 104 to the transistor 96 through the transistor 102. Pull in I 1 . For this reason,
A reference current I 1 (= 2I 1 −I 1 ) flows through the current mirror circuit 116, and this reference current I 1 flows through the transistor 114 to the speed adjustment resistor 68, generating a voltage V 1 at the speed adjustment resistor 68. To do. At this time, assuming that the resistance values of the reference resistor 88 and the speed adjustment resistor 68 are R K and R S , the rotation speed N 1 of the motor 44 is N 1 = (1 / K m ) · (V ref · R S / R K ) ... (1) However, 1 / K m is a back electromotive force constant determined by the motor 44.
次に、制御入力端子108に対して解放電位V2が設定さ
れた場合、トランジスタ106が導通状態となり、電流ミ
ラー回路104の動作が停止される。トランジスタ90に流
れる基準電流I1に対して、電流ミラー効果によってトラ
ンジスタ96に基準電流I1の２倍の電流2I1が基準電流I2
として流れるが、電流ミラー回路104の動作が停止され
ているため、トランジスタ96に流れる基準電流I2は、そ
の全部が電流ミラー回路116に流れ込み、この基準電流I
2がトランジスタ114を通して速度調整用抵抗68に流れ、
速度調整用抵抗68に電圧V2が発生する。このとき、モー
タ44の回転数N2は、 N2＝（1/Km）・（2Vref・RS/RK） ＝2N1 ・・・（２） となる。Next, when the release potential V 2 is set for the control input terminal 108, the transistor 106 becomes conductive and the operation of the current mirror circuit 104 is stopped. With respect to the reference current I 1 flowing through the transistor 90, twice the current 2I 1 the reference current of the reference current I 1 to the transistor 96 by the current mirror effect I 2
However, since the operation of the current mirror circuit 104 is stopped, the entire reference current I 2 flowing in the transistor 96 flows into the current mirror circuit 116 and the reference current I 2
2 flows through the transistor 114 to the speed adjustment resistor 68,
A voltage V 2 is generated at the speed adjustment resistor 68. At this time, the rotation speed N 2 of the motor 44 is N 2 = (1 / K m ) (2V refR S / R K ) = 2N 1 (2)
このように速度調整用抵抗68の抵抗値RSを一定値に設
定して基準電流I1、I2の切換えに応じて基準電流I1、I2
に比例し、温度変化に無関係に一定の回転数N1、N2を得
ることができる。In this way, the resistance value R S of the speed adjusting resistor 68 is set to a constant value and the reference currents I 1 and I 2 are changed according to the switching of the reference currents I 1 and I 2.
, And constant rotation speeds N 1 and N 2 can be obtained regardless of temperature changes.
しかも、基準電流I1、I2は、基準抵抗88によって温度
変化に応じた値に設定でき、モータ44の回転数N1、N2を
温度変化に無関係に一定にできる。Moreover, the reference currents I 1 and I 2 can be set to values according to the temperature change by the reference resistor 88, and the rotation speeds N 1 and N 2 of the motor 44 can be made constant regardless of the temperature change.
また、モータ44の回転数は、基準電圧Vrefの変更によ
って設定されるので、速度制御ループの変更がなく、基
準電流I1、I2に関係なく、適正な制御動作が得られ、負
荷の変動に対しても安定した回転速度が得られる。Further, since the rotation speed of the motor 44 is set by changing the reference voltage V ref , there is no change in the speed control loop, proper control operation is obtained regardless of the reference currents I 1 and I 2 , and the load A stable rotation speed can be obtained against fluctuations.
なお、実施例では基準電流I1、I2のように２段階に設
定したが、３段階以上に設定することも可能であり、し
かも、基準電流は任意の値に設定することができる。Although the reference currents I 1 and I 2 are set in two stages in the embodiment, they can be set in three or more stages, and the reference current can be set to any value.
この発明によれば、設定された基準電流の切換えを、
集積回路の制御入力端子の電位設定によって行うことが
でき、その基準電流の切換えに応じた回転数を得ること
ができ、従来の抵抗などの外付け部品が不要であり、そ
の温度係数の影響がなく、簡単な構成によって、温度変
化に対しても安定した回転数を得ることができる。According to the present invention, the switching of the set reference current
This can be done by setting the potential of the control input terminal of the integrated circuit, the rotation speed can be obtained according to the switching of the reference current, external components such as conventional resistors are unnecessary, and the effect of the temperature coefficient is In addition, with a simple configuration, it is possible to obtain a stable rotation speed even with a temperature change.
第１図はこの発明の電子ガバナの実施例を示す回路図、
第２図は従来の電子ガバナを示す回路図である。 44……モータ 54……第１のトランジスタ 62……第１の抵抗 64……第２のトランジスタ 68……第２の抵抗 72……バッファ回路 74……比較器（比較手段） 80……電圧源 85……電圧・電流変換回路（電圧・電流変換手段） 98……第１の電流ミラー回路 104……第２の電流ミラー回路 116……第３の電流ミラー回路FIG. 1 is a circuit diagram showing an embodiment of an electronic governor of the present invention,
FIG. 2 is a circuit diagram showing a conventional electronic governor. 44 …… Motor 54 …… First transistor 62 …… First resistance 64 …… Second transistor 68 …… Second resistance 72 …… Buffer circuit 74 …… Comparator (comparing means) 80 …… Voltage Source 85 ... voltage-current conversion circuit (voltage-current conversion means) 98 ... first current mirror circuit 104 ... second current mirror circuit 116 ... third current mirror circuit
Claims (1)
第１のトランジスタと、 前記モータの内部抵抗に対応した抵抗値を持つ第１の抵
抗に直列に接続されて前記駆動電流に対応する動作電流
を流し、前記第１の抵抗に第１の電圧を生じさせる第２
のトランジスタと、 定電流を受けて基準電圧を発生する電圧源と、 この電圧源が発生した前記基準電圧を電流に変換する電
圧・電流変換手段と、 この電圧・電流変換手段が発生した基準電流を受けて第
１及び第２の基準電流を発生する第１の電流ミラー回路
と、 動作が外部から選択的に切り換えられ、動作状態のと
き、前記第１の電流ミラー回路から前記第１の基準電流
を受け、前記第２の基準電流から前記第１の基準電流を
引き込み、遮断状態のとき、前記第１の基準電流の引き
込みを停止する第２の電流ミラー回路と、 この第２の電流ミラー回路の出力側に側路を成して併設
され、前記第２の電流ミラー回路が動作状態にあると
き、前記第２の基準電流から前記第１の基準電流の差電
流を引き込み、また、前記第２の電流ミラー回路が遮断
状態にあるとき、前記第２の基準電流を引き込む第３の
電流ミラー回路と、 この第３の電流ミラー回路によって与えられる前記差電
流又は前記第２の基準電流に応じた値の第２の電圧を生
じさせる第２の抵抗と、 この第２の抵抗に生じた前記第２の電圧を受け、前記第
１の抵抗に生じている前記第１の電圧に加算させるバッ
ファ回路と、 前記第１及び第２の電圧の加算値と前記モータに生じた
逆起電力とを比較し、その差電圧に応じてベース電流を
前記第１及び第２のトランジスタのベースに流す比較手
段と、 を備えて、前記第２の電圧が前記第２の電流ミラー回路
の動作切換えによって基準電流の値が変更されることに
より、前記モータの回転数を切り換えるようにしたこと
を特徴とする電子ガバナ。1. A first transistor connected in series to a motor for supplying a drive current, and a first resistor having a resistance value corresponding to an internal resistance of the motor connected in series to correspond to the drive current. A second current flown to generate a first voltage across the first resistor;
Transistor, a voltage source that receives a constant current to generate a reference voltage, a voltage / current conversion unit that converts the reference voltage generated by the voltage source into a current, and a reference current generated by the voltage / current conversion unit. A first current mirror circuit which receives the first and second reference currents in response to the first current mirror circuit, and the operation of which is selectively switched from the outside and is in an operating state. A second current mirror circuit that receives a current, draws the first reference current from the second reference current, and stops the drawing of the first reference current when in a cutoff state; and the second current mirror. When the second current mirror circuit is in an operating state and is provided side by side with the output side of the circuit, the differential current of the first reference current is drawn from the second reference current, and Second current mirror circuit A third current mirror circuit that draws in the second reference current when in the cutoff state, and a second current having a value corresponding to the differential current or the second reference current provided by the third current mirror circuit. A second resistor for generating a voltage; a buffer circuit for receiving the second voltage generated in the second resistor and adding it to the first voltage generated in the first resistor; And a comparison means for comparing the added value of the second voltage and the counter electromotive force generated in the motor, and flowing a base current to the bases of the first and second transistors according to the difference voltage. An electronic governor characterized in that the rotation speed of the motor is switched by changing the value of the reference current of the second voltage by switching the operation of the second current mirror circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62019410A JPH084390B2 (en) | 1987-01-29 | 1987-01-29 | Electronic governor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62019410A JPH084390B2 (en) | 1987-01-29 | 1987-01-29 | Electronic governor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63190586A JPS63190586A (en) | 1988-08-08 |
| JPH084390B2 true JPH084390B2 (en) | 1996-01-17 |
Family
ID=11998482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62019410A Expired - Fee Related JPH084390B2 (en) | 1987-01-29 | 1987-01-29 | Electronic governor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH084390B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003007466A1 (en) * | 2001-07-12 | 2003-01-23 | Brother Kogyo Kabushiki Kaisha | Dc motor drive circuit and tape printer comprising the same circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5915293U (en) * | 1982-07-19 | 1984-01-30 | 三洋電機株式会社 | DC motor speed control circuit |
| JPS61273191A (en) * | 1985-05-24 | 1986-12-03 | Rohm Co Ltd | Electronic governor |
-
1987
- 1987-01-29 JP JP62019410A patent/JPH084390B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63190586A (en) | 1988-08-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |