JP4392831B2 - Brushless motor drive circuit with variable current limiter circuit - Google Patents
Brushless motor drive circuit with variable current limiter circuit Download PDFInfo
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Description
本発明はブラシレスモータの駆動に係り、特に電流リミッタ方式を有する小型フアンの駆動回路に適するものに関する。 The present invention relates to driving of a brushless motor, and more particularly to a motor suitable for a small fan driving circuit having a current limiter system.
図２は従来から実施されている過電流保護回路を有するブラシレスモータの駆動回路の例で、１はロータの磁極位置を検出するためのホール素子、２はモータ駆動用ドライバＩＣ、３，４はパワー制御素子、５は固定子巻線、６は電流検出抵抗、７は抵抗、８はコンデンサ、１１は比較回路、９，１０は比較回路１１のしきい値電圧発生用の分圧抵抗、ダイオード１２、により構成されている。
そしてモータ駆動用ドライバＩＣ２には、ロジック信号発生回路２−１と、パルス信号発生回路２−２と、ロック検出用コンデンサ３３の電圧検出回路２−４と、同コンデンサ３３の充放電回路２−３が設けられている。
FIG. 2 shows an example of a driving circuit for a brushless motor having an overcurrent protection circuit that has been conventionally implemented. 1 is a Hall element for detecting the magnetic pole position of the rotor, 2 is a driver IC for driving the motor, and 3 and 4 are Power control element, 5 is a stator winding, 6 is a current detection resistor, 7 is a resistor, 8 is a capacitor, 11 is a comparison circuit, 9 and 10 are voltage dividing resistors for generating a threshold voltage of the comparison circuit 11, and a diode 12.
The motor drive driver IC 2 includes a logic signal generation circuit 2-1, a pulse signal generation circuit 2-2, a voltage detection circuit 2-4 for the lock detection capacitor 33, and a charge / discharge circuit 2-2 for the capacitor 33. 3 is provided.
図２に示す従来技術になる過電流保護回路を有するブラシレスモータの駆動回路の動作を説明する。当該過電流保護回路を有するブラシレスモータの駆動回路は、ホール素子１の出力信号をモータ駆動用ドライバＩＣ２のロジック信号発生回路２−１に入力し、ロジック信号発生回路２−１から２個の通電信号がパワー制御素子３，４に送られ固定子巻線５に交互に通電して、ロータを所定方向に回転させ、図示されていないフアン・ブロワーを駆動するようになっている。 The operation of the drive circuit for the brushless motor having the overcurrent protection circuit according to the prior art shown in FIG. 2 will be described. The drive circuit of the brushless motor having the overcurrent protection circuit inputs the output signal of the hall element 1 to the logic signal generation circuit 2-1 of the motor driver IC 2 and supplies two energizations from the logic signal generation circuit 2-1. A signal is sent to the power control elements 3 and 4, and the stator windings 5 are alternately energized to rotate the rotor in a predetermined direction to drive a fan blower (not shown).
図示の構成においては、過負荷となりロータの回転数が低下するとパワー制御素子３，４に過大な電流が流れ過熱する恐れがある。この過熱を防止するためにパワー制御素子３，４と接地の間に電流検出抵抗６を設け、該電流検出抵抗６の電圧を抵抗７とコンデンサ８による平滑回路を介して比較回路１１のー側端子に入力し、比較回路１１の＋側端子に抵抗９と抵抗１０でＶCCを分圧したしきい値電圧を入力し、該比較回路１１の出力をパワー制御素子３，４の入力側に接続したダイオード１２に入力し、比較回路１１の出力が”ＬＯ”レベルとなるとダイオード１２がＯＮとなりパワー制御素子３，４の入力を遮断する構成の過電流保護回路が設けられている。 In the configuration shown in the figure, if an overload occurs and the rotational speed of the rotor decreases, an excessive current may flow through the power control elements 3 and 4 to cause overheating. In order to prevent this overheating, a current detection resistor 6 is provided between the power control elements 3 and 4 and the ground, and the voltage of the current detection resistor 6 is connected to the negative side of the comparison circuit 11 through a smoothing circuit of the resistor 7 and the capacitor 8. The threshold voltage obtained by dividing VCC by the resistors 9 and 10 is input to the + side terminal of the comparison circuit 11, and the output of the comparison circuit 11 is connected to the input side of the power control elements 3 and 4. An overcurrent protection circuit having a configuration in which the diode 12 is turned on when the output of the comparison circuit 11 becomes “LO” level and the input of the power control elements 3 and 4 is cut off is provided.
上述過電流保護回路の動作は、電流検出抵抗６の電圧を抵抗７とコンデンサ８により平滑されて比較回路１１のー側端子に入力し、比較回路１１の＋側端子に抵抗９と抵抗１０でＶCCを分圧したしきい値電圧を入力して比較し、コンデンサ８の電圧がしきい値電圧より低ければ比較回路１１の出力は"ＨＩ”レベルとなりダイオード１２がＯＦＦとなりパワー制御素子３，４に通電信号が入力されてＯＮとなりモータは回転を継続し、コンデンサ８の電圧がしきい値電圧より高ければ比較回路１１の出力は”ＬＯ”レベルとなりダイオード１２がＯＮとなりパワー制御素子３，４はＯＦＦとなりモータは回転せずパワー制御素子３，４は過熱から保護される。 In the operation of the overcurrent protection circuit described above, the voltage of the current detection resistor 6 is smoothed by the resistor 7 and the capacitor 8 and input to the minus side terminal of the comparison circuit 11, and the resistor 9 and the resistor 10 are connected to the plus side terminal of the comparison circuit 11. A threshold voltage obtained by dividing VCC is inputted and compared. If the voltage of the capacitor 8 is lower than the threshold voltage, the output of the comparison circuit 11 becomes "HI" level, the diode 12 is turned OFF, and the power control elements 3, 4 When an energization signal is input to the motor, the motor continues to rotate, and if the voltage of the capacitor 8 is higher than the threshold voltage, the output of the comparison circuit 11 becomes "LO" level, the diode 12 is turned on, and the power control elements 3, 4 Becomes OFF, the motor does not rotate, and the power control elements 3 and 4 are protected from overheating.
また、モータ駆動用ドライバＩＣ２には、ロジック信号発生回路２−１と該ロジック信号発生回路２−１の出力によりロータの回転を検出するパルス信号発生回路２−２と、該パルス信号発生回路２−２の外部出力端子Ｐと、ロック検出コンデンサ３３の電圧検出回路２−４と、該ロック検出コンデンサ３３の電圧検出回路２−４の外部端子Ｒと、同コンデンサの充放電回路２−３が設けられており、ロック検出コンデンサ３３はロータが回転しているときは常時充放電回路２−３により充電され、かつパルス信号発生回路２−２の出力パルスにより放電されており、このロック検出コンデンサ３３の電圧を電圧検出回路２−４で検出し、充電により所定のロック検出電圧に達していることを検出するとロジック信号発生２−１の出力を遮断し、パワー制御素子３，４に送らないようにし、放電により所定の自動復帰電圧に達していることを検出するとロジック信号発生２−１の信号出力をパワー制御素子３，４に送るように動作する。 The motor driver IC 2 includes a logic signal generation circuit 2-1, a pulse signal generation circuit 2-2 for detecting the rotation of the rotor based on the output of the logic signal generation circuit 2-1, and the pulse signal generation circuit 2. -2 external output terminal P, a voltage detection circuit 2-4 of the lock detection capacitor 33, an external terminal R of the voltage detection circuit 2-4 of the lock detection capacitor 33, and a charge / discharge circuit 2-3 of the capacitor The lock detection capacitor 33 is always charged by the charge / discharge circuit 2-3 when the rotor is rotating, and is discharged by the output pulse of the pulse signal generation circuit 2-2. The voltage 33 is detected by the voltage detection circuit 2-4, and when it is detected that the predetermined lock detection voltage is reached by charging, the output of the logic signal generation 2-1 is cut off. The power control elements 3 and 4 are not sent, and when it is detected that a predetermined automatic return voltage has been reached by discharging, the signal output of the logic signal generation 2-1 is sent to the power control elements 3 and 4. .
モータが正常に回転しているときは、パルス信号発生回路２−２の信号により充放電回路２−３がロック検出コンデンサ３３の電荷を放電するから、その電圧は上昇せず電圧検出回路２−４は所定の自動復帰電圧以下であることを検出するとロジック信号発生２−１の信号をパワー制御素子３，４に送るように動作しモータが回転を継続する。 When the motor is rotating normally, the charge / discharge circuit 2-3 discharges the charge of the lock detection capacitor 33 by the signal of the pulse signal generation circuit 2-2, so that the voltage does not rise and the voltage detection circuit 2- When 4 is detected to be equal to or lower than a predetermined automatic return voltage, the operation of sending the signal of the logic signal generation 2-1 to the power control elements 3 and 4 is performed and the motor continues to rotate.
ロータが機械的にロックされると、パルス信号発生回路２−２からパルス信号が発生しなくなるから充放電回路２−３は放電を停止し充電のみとなりロック検出用コンデンサ３３の電圧が上昇し、電圧検出回路２−４が所定のロック検出電圧以上の電圧であることを検出すると、ロジック信号発生２−１の信号を遮断してパワー制御素子３，４に送らなくなるのでモータを停止させパワー制御素子３，４の過熱を防止する。 When the rotor is mechanically locked, no pulse signal is generated from the pulse signal generating circuit 2-2, so the charging / discharging circuit 2-3 stops discharging and only becomes charged, and the voltage of the lock detecting capacitor 33 rises. When the voltage detection circuit 2-4 detects that the voltage is equal to or higher than a predetermined lock detection voltage, the signal of the logic signal generation 2-1 is cut off and is not sent to the power control elements 3 and 4, so the motor is stopped and power control is performed. The element 3 and 4 are prevented from overheating.
電圧検出回路２−４が充電により所定のロック検出電圧に達していることを検出すると、ロック検出用コンデンサ３３が充放電回路２−３の時定数の長い回路により放電を開始し、所定時間時間後に電圧検出回路２−４が放電により自動復帰電圧に達したことを検出すると、ロジック信号発生回路２−１の信号がパワー制御素子３，４に入力されモータの回転が自動的に復帰する。 When the voltage detection circuit 2-4 detects that the predetermined lock detection voltage has been reached by charging, the lock detection capacitor 33 starts discharging by a circuit having a long time constant of the charge / discharge circuit 2-3, and the predetermined time period. When the voltage detection circuit 2-4 later detects that the automatic return voltage has been reached due to the discharge, the signal of the logic signal generation circuit 2-1 is input to the power control elements 3 and 4, and the rotation of the motor is automatically recovered.
図２に示す従来技術の回路においては、モータ駆動用ドライバＩＣ２にロータのロックを検出してパワー素子３，４への通電を止めて過熱を防止する装置と、一方で通電電流を検出して比較回路でしきい値と比較して過負荷電流を制限する回路による過熱を防止する装置とが設けられており、それぞれの過熱防止装置が運転状況に対応して作動するようになっている。 In the prior art circuit shown in FIG. 2, the motor drive driver IC 2 detects a rotor lock and stops energization of the power elements 3 and 4 to prevent overheating. An apparatus for preventing overheating by a circuit that limits an overload current by comparing with a threshold value in a comparison circuit is provided, and each overheat prevention apparatus operates in accordance with an operation state.
ロータが機械的にロックすると、電流は急激に増加しパワー制御素子３，４の温度上昇が急激であるから、ロックを検出してから短時間で反応し、電流の制限値を低く抑えることにより安全性を確保するため、図２に示した回路でモータ駆動用ドライバＩＣ２に設けられたロータのロックを検出方式は反応が早く、電流のリミット値を決定する比較回路１１のしきい値電圧は、抵抗Ｒ9と抵抗Ｒ10でＶCCを分圧した値で決定されるから、一般的にしきい値電圧を低く設定する。 When the rotor is mechanically locked, the current increases rapidly, and the temperature rise of the power control elements 3 and 4 is rapid. Therefore, the rotor reacts in a short time after detecting the lock, and the current limit value is kept low. In order to ensure safety, the method of detecting the lock of the rotor provided in the motor driver IC 2 in the circuit shown in FIG. 2 has a fast response, and the threshold voltage of the comparison circuit 11 that determines the current limit value is The threshold voltage is generally set to a low value because it is determined by a value obtained by dividing VCC by the resistors R9 and R10.
ところがモータの運転状況は、起動時、ロータのロック時、過負荷時のそれぞれの状況に応じた過電流が流れ、パワー制御素子３，４が過熱することがある。 However, as for the motor operating condition, an overcurrent corresponding to each condition at the time of start-up, rotor locking, and overload flows, and the power control elements 3 and 4 may overheat.
起動時においては、立ち上がりを速くするため定常回転数に達するまでに大きな電流を流すように電流リミットのしきい値を大きく設定したい。
また、一般的に起動時においては、定常回転数に達するまでに電流がリミットのしきい値まで流れるため、多数のフアン・ブロワーを備えた装置において、多数のフアン・ブロワーを同時に起動させる場合大きな電源容量が必要となる。
At startup, I want to set a large threshold for the current limit so that a large current flows until the steady rotational speed is reached in order to speed up the start-up.
In general, when starting up, the current flows up to the limit threshold value until the steady rotational speed is reached. Therefore, when a large number of fan blowers are started simultaneously in a device equipped with a large number of fan blowers. Power supply capacity is required.
定常運転状態で負荷が増大し電流がリミット値に近い値で継続して流れるとパワー制御素子３，４が過熱することがある。 If the load increases in a steady operation state and the current continuously flows at a value close to the limit value, the power control elements 3 and 4 may overheat.
最近のフアン・ブロワーにおいては、小型でありながらハイパワー化が進んでおり、電流の増加傾向にある。そこで従来技術においても電流リミット回路を設けてピーク電流を抑えているが、図２の回路においては電流制限のしきい値を定常回転時に合わせて一定に設定しているため、ロック時にも同様なピーク電流が流れる結果パワー制御素子の過熱が問題となる。
本発明は、起動時、定常回転時、ロック時等の色々の運転状況に対応した電流制限値を設定でき電流リミッタ回路を得ることにより小型のパワー制御素子でより大きな電流が流せるようにするのが課題である。
In recent fan blowers, high power has been developed despite being small, and the current tends to increase. Therefore, the current limit circuit is also provided in the prior art to suppress the peak current. However, in the circuit of FIG. 2, since the current limit threshold is set to be constant in accordance with the steady rotation, the same applies when locking. As a result of the peak current flowing, overheating of the power control element becomes a problem.
The present invention is capable of setting a current limit value corresponding to various operation situations such as start-up, steady-state rotation, lock, etc., and obtaining a current limiter circuit so that a larger current can flow with a small power control element. Is an issue.
ロック検出センサ出力と、回転パルスセンサの出力より回転数に対応する電流リミッタ回路のしきい値を設定することにより、ロック時は電流のリミット値を低く、起動時は回転数の上昇に従い電流のリミット値を高くできる。課題を解決するため、ロータの回転数に同期した電流しきい値を設定できる可変型電流リミッタ回路を設ける。 By setting the threshold value of the current limiter circuit corresponding to the rotation speed from the lock detection sensor output and the output of the rotation pulse sensor, the current limit value is lowered during locking, and the current increases as the rotation speed increases during startup. The limit value can be increased. In order to solve the problem, a variable current limiter circuit capable of setting a current threshold value synchronized with the rotational speed of the rotor is provided.
本発明になる回転数に同期した可変型電流リミット回路を備えたブラシレスモータの駆動回路は上記のような構成であるから下記の効果が得られる。
回転数に見合った電流リミッタのしきい値を設定することにより、ロック時には電流リミッタの値を低くし、パワー素子の発熱を抑え、起動時にはソフトスタートの効果をもたらし、定常回転から何らかの外力による負荷がかかった場合には回転数が低下するのに同期して電流リミッタのしきい値が下がり過負荷保護の効果が得られる。
Since the drive circuit of the brushless motor provided with the variable current limit circuit synchronized with the rotational speed according to the present invention is configured as described above, the following effects can be obtained.
By setting a current limiter threshold value that matches the number of revolutions, the current limiter value is lowered when locked, suppresses heat generation of the power element, brings about a soft start effect during startup, and loads due to some external force from steady rotation When this occurs, the threshold value of the current limiter is lowered in synchronism with the decrease in the rotational speed, and an overload protection effect can be obtained.
以下本発明の実施例を説明する。 Examples of the present invention will be described below.
図１は本発明になる可変型電流リミッタ回路を備えたブラシレスモータの駆動装置の回路図で、図において一点鎖線より上部（Ａ区画）は図２に示す従来技術になる過負荷保護回路を備えたブラシレスモータの回路図と同じで、一点鎖線より下部（Ｂ区画）が本発明になる回転数に同期した電流しきい値を設定できる可変型電流リミッタ回路の部分である。 FIG. 1 is a circuit diagram of a brushless motor driving apparatus equipped with a variable current limiter circuit according to the present invention. In FIG. In the same way as the circuit diagram of the brushless motor, the portion below the one-dot chain line (B section) is the part of the variable current limiter circuit that can set the current threshold value synchronized with the rotational speed according to the present invention.
一点鎖線より下部（Ｂ区画）の本発明になる回転数に同期した電流しきい値を設定できる電流リミッタ回路の部分について説明する。
図において、制御用電源Ｖccと第１のトランジスタ２０のエミッタを接続し、該トランジスタ２０のコレクタと、第２のトランジスタ２１のエミッタを接続し、該トランジスタ２１のコレクタをダイオード２２に接続し、ダイオード２２と接地の間に抵抗２３を接続し、第１のトランジスタ２０のベースとモータ駆動用ドライバＩＣ２のロック検出端子Ｒとを接続し、第２のトランジスタ２１のベースとモータ駆動用ドライバＩＣ２のパルス信号出力端子Ｐとを接続し、ダイオード２２と抵抗２３の接続点と、コンデンサ２４とダイオード２６と抵抗２７とを直列に接続して第３のトランジスタ２８のベースに接続し、該トランジスタ２８のコレクタとＶCCの間に抵抗２９を、トランジスタ２８のエミッタとＶccの間に抵抗３１を、トランジスタ２８のエミッタと接地の間にコンデンサ３０を、トランジスタ２８のエミッタと比較回路３６の＋側端子の間に抵抗３２を、抵抗３２と比較回路３６の＋側端子との接続点と接地の間にコンデンサ３４と抵抗３５を接続し、比較回路３６のー側端子と電流検出抵抗６の間に抵抗７を、比較回路３６のー側端子と接地の間に抵抗３７を接続してある。
The part of the current limiter circuit which can set the current threshold value synchronized with the rotational speed of the present invention below the one-dot chain line (B section) will be described.
In the figure, the control power supply Vcc and the emitter of the first transistor 20 are connected, the collector of the transistor 20 and the emitter of the second transistor 21 are connected, the collector of the transistor 21 is connected to the diode 22, and the diode The resistor 23 is connected between the ground 22 and the ground, the base of the first transistor 20 is connected to the lock detection terminal R of the driver IC 2 for driving the motor, and the pulse of the base of the second transistor 21 and the motor driving driver IC 2 is connected. The signal output terminal P is connected, the connection point of the diode 22 and the resistor 23, the capacitor 24, the diode 26 and the resistor 27 are connected in series and connected to the base of the third transistor 28, and the collector of the transistor 28 is connected. A resistor 29 is connected between Vcc and Vcc, and a resistor 31 is connected between the emitter of the transistor 28 and Vcc. 28 between the emitter of the transistor 28 and the ground, a resistor 32 between the emitter of the transistor 28 and the positive side terminal of the comparison circuit 36, and a connection point between the resistor 32 and the positive side terminal of the comparison circuit 36 and the ground. A capacitor 34 and a resistor 35 are connected, a resistor 7 is connected between the negative terminal of the comparison circuit 36 and the current detection resistor 6, and a resistor 37 is connected between the negative terminal of the comparison circuit 36 and the ground.
図１に示す本発明になる回転数に同期した可変型電流リミッタ回路の各動作条件における動作について説明する。
ロック時の動作：ロータがロックすると、モータ駆動用ドライバＩＣ２のロック検出信号の端子Ｒが”HＩ”レベルとなり、第１のトランジスタ２０にベース電流が供給されなくなるからＯＦＦとなり、このため第２のトランジスタ２１の動作に関わらず、Ｖccから抵抗２７までの回路に電流が流れず第３のトランジスタ２８のベースに電流が供給されないため、比較回路３６に供給されるしきい値電圧は抵抗３１、抵抗３２、抵抗３５の分圧値で決定されるから、ロック時の電流を減少させるためしきい値電圧が低くなるように上記抵抗３１、抵抗３２、抵抗３５の値を設定する。
The operation of the variable current limiter circuit synchronized with the rotational speed shown in FIG.
Operation at the time of locking: When the rotor is locked, the terminal R of the lock detection signal of the driver IC 2 for driving the motor becomes “HI” level, and the base current is not supplied to the first transistor 20, so that the second transistor is turned OFF. Regardless of the operation of the transistor 21, no current flows through the circuit from Vcc to the resistor 27 and no current is supplied to the base of the third transistor 28. Therefore, the threshold voltage supplied to the comparison circuit 36 is the resistor 31 and the resistor 32, the values of the resistor 31, resistor 32, and resistor 35 are set so that the threshold voltage is lowered in order to reduce the current during locking.
起動時の動作
起動時にはロータが回転を始めるとモータ駆動用ドライバＩＣ２のロック検出回路の端子Ｒの出力が”ＬＯ”となり、第１のトランジスタ２０がＯＮとなり、かつモータ駆動用ドライバＩＣ２のＰ端子から相切替え周期に同期したパルス信号が第２のトランジスタ２１に入力されることにより、Ａ点に相切替え周期に同期した矩形波が印加され、Ｂ点にはこの矩形波がコンデンサ２４によって微分され、さらにダイオード２６により負領域がカットされた電圧波形が第３のトランジスタ２８に印加される。
これにより第３のトランジスタ２８が相切替え周期に同期してＯＮ・ＯＦＦを繰り返し、抵抗２９により制限された充電電流がコンデンサ３０に流れ、Ｃ点の電圧が上昇する。そして、コンデンサ３０の電圧が抵抗３２を介して比較回路３６に供給されしきい値電圧が上昇する。
Operation at start-up When the rotor starts rotating at start-up, the output of the terminal R of the lock detection circuit of the motor drive driver IC2 becomes "LO", the first transistor 20 is turned on, and the P terminal of the motor drive driver IC2 A pulse signal synchronized with the phase switching period is input to the second transistor 21 to apply a rectangular wave synchronized with the phase switching period to point A, and this rectangular wave is differentiated by the capacitor 24 at point B. Further, a voltage waveform in which the negative region is cut by the diode 26 is applied to the third transistor 28.
As a result, the third transistor 28 repeats ON / OFF in synchronization with the phase switching period, the charging current limited by the resistor 29 flows to the capacitor 30, and the voltage at the point C rises. The voltage of the capacitor 30 is supplied to the comparison circuit 36 via the resistor 32, and the threshold voltage increases.
回転数が増加すると第３のトランジスタ２８のＯＦＦ区間が短くなるため、コンデンサ３０の充電比率が増加することで比較回路３６に供給されるしきい値電圧が上昇してゆき定常値に達すると安定する。 As the number of revolutions increases, the OFF section of the third transistor 28 becomes shorter, so that the threshold voltage supplied to the comparison circuit 36 increases as the charging ratio of the capacitor 30 increases, and becomes stable when it reaches a steady value. To do.
過負荷時においては起動時の動作の逆の現象が起こる。すなわち、過負荷となると回転数が低下することにより、第３のトランジスタ２８のＯＦＦ区間が長くなるため、コンデンサ３０の充電時間が低下することにより、比較回路３６に供給されしきい値電圧も低下していく。
このようにして、比較回路３６の電流リミット値のしきい値がモータの回転数に対応して変化する。
In the event of an overload, the reverse phenomenon of the startup operation occurs. That is, when the engine is overloaded, the number of rotations is reduced, and the OFF section of the third transistor 28 is lengthened. Therefore, the charging time of the capacitor 30 is reduced, so that the threshold voltage supplied to the comparison circuit 36 is also reduced. I will do it.
In this way, the threshold value of the current limit value of the comparison circuit 36 changes corresponding to the motor speed.
本発明の産業上の利用可能性は、フアンモータの駆動回路に限定される。 The industrial applicability of the present invention is limited to the fan motor drive circuit.
１ ロ ータの磁極位置検出用ホール素子
２ モータ駆動用ドライバＩＣ
3、4 パワー制御素子
５ 固定子巻線
６ 電流検出用抵抗
７ 抵抗
８ コンデンサ
９、１０ 抵抗
１１ 比較回路
１２ ダイオード
２０、２１、２８ トランジスタ
２２、２６ ダイオード
２４、３０、３４ コンデンサ
２３、２５、２７、２９、３１、３２、３５、３７ 抵抗
３６ 比較回路
ＶCC 制御用電源
1 Rotor magnetic pole position detection Hall element 2 Motor driver IC
3, 4 Power control element 5 Stator winding 6 Current detection resistor 7 Resistor 8 Capacitor 9, 10 Resistor 11 Comparison circuit 12 Diode 20, 21, 28 Transistor 22, 26 Diode 24, 30, 34 Capacitor 23, 25, 27 29, 31, 32, 35, 37 Resistor 36 Comparison circuit VCC Control power supply
Claims (1)
とロータの回転をパルス信号に変換するパルス信号とロータロック時のロック検
出信号を出力するモータ駆動用ドライバＩＣと、パワー制御素子とを有し、巻線
電流検出回路と、しきい値電圧発生回路と、前記電流検出回路の出力としきい値
電圧とを比較する比較回路と共に、巻線電流を所定の値に制限する電流リミッタ
回路をも備えるブラシレスＤＣモータの駆動回路において、
ベースが前記モータ駆動用ドライバＩＣ（２）のロック検出信号端子（Ｒ）に、
エミッタが制御用電源（ＶＣＣ）に、コレクタが第２のトランジスタ（２１）の
エミッタに接続された第１のトランジスタ（２０）と、ベースが前記モータ駆動
用ドライバＩＣ（２）のパルス信号端子（Ｐ）に、コレクタがダイオード（２２）
に接続された前記第２のトランジトランジスタ（２１）と、前記ダイオード（２
２）と接地間に接続された抵抗（２３）と、該ダイオード（２２）と抵抗（２３）
との接続点と接地間に直列接続されたコンデンサ（２４）及び抵抗（２５）と、
該コンデンサ（２４）と抵抗（２５）との接続点及び第３のトランジスタ（２８）
のベース間に直列接続されたダイオード（２６）及び抵抗（２７）と、前記第３
のトランジスタ（２８）のコレクタと制御用電源（ＶＣＣ）の間に接続された抵
抗（２９）と、同第３のトランジスタ（２８）のエミッタと接地間に接続された
コンデンサ（３０）と、同第３のトランジスタ（２８）のエミッタと制御用電源
（ＶＣＣ）との間に接続された抵抗（３１）と、同第３のトランジスタ（２８）
のエミッタと接地間に直列接続された抵抗（３２）及びコンデンサ（３４）と、
該抵抗（３２）とコンデンサ（３４）との接続点と接地間に接続された抵抗（３
５）と、＋側端子が前記抵抗（３２）とコンデンサ（３４）との接続点に接続さ
れ、−側端子が抵抗（３７）を介して接地されると共に、該−側端子が抵抗（７）
を介して電流検出抵抗（６）に接続される比較回路（３６）とより成ること、を
特徴とする回転数に同期した可変型電流リミッタ回路を備えるブラシレスモータ
の駆動回路。 Hall element for detecting rotor magnetic pole position and logic signal received from the output of the hall element
And a pulse signal that converts the rotation of the rotor into a pulse signal and lock detection when the rotor is locked
A motor driving driver IC that outputs an output signal , a power control element, and a winding
A current detection circuit; a threshold voltage generation circuit; an output of the current detection circuit;
In a drive circuit for a brushless DC motor, which has a current limiter circuit that limits the winding current to a predetermined value together with a comparison circuit that compares the voltage ,
The base is connected to the lock detection signal terminal (R) of the motor driver IC (2).
The emitter is connected to the control power supply (VCC), and the collector is connected to the second transistor (21).
The first transistor (20) connected to the emitter, and the base is the motor drive
The collector is a diode (22) at the pulse signal terminal (P) of the driver IC (2)
The second transistor (21) connected to the diode (2) and the diode (2
2) a resistor (23) connected between the ground and the diode (22) and the resistor (23)
A capacitor (24) and a resistor (25) connected in series between the connection point between the capacitor and the ground;
Connection point between the capacitor (24) and the resistor (25) and the third transistor (28)
A diode (26) and a resistor (27) connected in series between the bases of
Connected between the collector of the transistor (28) and the control power supply (VCC).
Anti (29) and connected between the emitter of the third transistor (28) and ground
Capacitor (30), emitter of third transistor (28) and control power supply
The third transistor (28) and the resistor (31) connected between the first and second transistors (VCC)
A resistor (32) and a capacitor (34) connected in series between the emitter of the transistor and ground;
A resistor (3 connected between the connection point of the resistor (32) and the capacitor (34) and the ground)
5) and the + side terminal is connected to the connection point of the resistor (32) and the capacitor (34).
The-side terminal is grounded via the resistor (37), and the-side terminal is connected to the resistor (7).
And a comparison circuit (36) connected to the current detection resistor (6) via
Brushless motor having a variable current limiter circuit synchronized with the characteristic rotational speed
Drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004054705A JP4392831B2 (en) | 2004-02-27 | 2004-02-27 | Brushless motor drive circuit with variable current limiter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004054705A JP4392831B2 (en) | 2004-02-27 | 2004-02-27 | Brushless motor drive circuit with variable current limiter circuit |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2005245175A JP2005245175A (en) | 2005-09-08 |
| JP2005245175A5 JP2005245175A5 (en) | 2007-03-08 |
| JP4392831B2 true JP4392831B2 (en) | 2010-01-06 |
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ID=35026286
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004054705A Expired - Fee Related JP4392831B2 (en) | 2004-02-27 | 2004-02-27 | Brushless motor drive circuit with variable current limiter circuit |
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| Country | Link |
|---|---|
| JP (1) | JP4392831B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106799967A (en) * | 2015-11-26 | 2017-06-06 | 铃木株式会社 | The control device of electric vehicle |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4885549B2 (en) | 2006-01-23 | 2012-02-29 | ローム株式会社 | Motor driving circuit, driving method, and cooling device using the same |
| JP2020154772A (en) | 2019-03-20 | 2020-09-24 | ファナック株式会社 | System for controlling industrial machine |
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2004
- 2004-02-27 JP JP2004054705A patent/JP4392831B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106799967A (en) * | 2015-11-26 | 2017-06-06 | 铃木株式会社 | The control device of electric vehicle |
| CN106799967B (en) * | 2015-11-26 | 2019-06-04 | 铃木株式会社 | The control device of electric vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005245175A (en) | 2005-09-08 |
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