CN101083446A - Motor driving circuit - Google Patents
Motor driving circuit Download PDFInfo
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- CN101083446A CN101083446A CNA2007100887015A CN200710088701A CN101083446A CN 101083446 A CN101083446 A CN 101083446A CN A2007100887015 A CNA2007100887015 A CN A2007100887015A CN 200710088701 A CN200710088701 A CN 200710088701A CN 101083446 A CN101083446 A CN 101083446A
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Abstract
In a driving circuit for a linear driving type motor, the revolving speed of the motor (1) is controlled in accordance with the power supply voltage (V1) applied to the output amplifier (5). However, in driving circuit for motor of conventional technique, hall bias voltage (V2) applied to a hall element (3) is constant even if power supply voltage is changed. Thus, heat and noise due to difference between driving signal and power supply voltage are generated. In the inventive driving circuit of motor, amplitude of driving signal (S1) varies with respect to power supply voltage (V1) so as to keep a ratio of a saturation time and a non-saturation time constant. Consequently appropriate amplitude of driving signal with respect to revolving speed of the motor is obtained, whereby heat generation and noise generation can be restrained.
Description
Technical field
The present invention relates to motor drive circuit, particularly the motor drive circuit of linear drive mode.
Background technology
Fig. 5 represents an example of the motor drive circuit of prior art.
Motor 1 is the brushless single phase motor with winding 2.Described motor 1 is according to the drive signal S1 rotation that is applied to described winding 2.Thereby Hall element 3 detects the rotatable phase output detection signal S2 of described motor 1.Thereby Hall amplifier 4 amplifies described detection signal S2 output amplification detection signal S3.Thereby output amplifier 5 amplifies described amplification detection signal S3 according to supply voltage V1 exports described drive signal S1.Like this, described motor 1, described Hall element 3, described Hall amplifier 4 and described output amplifier 5 form feedback loop, the described motor 1 of Linear Driving.
In this motor drive circuit, the rotary speed of described motor 1 depends on described supply voltage V1.That is, the rotary speed of described motor 1 accelerates when described supply voltage V1 sets greatly, sets hour slack-offly at described supply voltage V1.
As the technical literature that is associated, can enumerate for example following patent documentation.
[patent documentation 1] (Japan) spy opens flat 5-30780 communique
In above-mentioned motor drive circuit, even switch described supply voltage V1, the amplitude of described drive signal S1 is also certain.
Fig. 6 represents the oscillogram of described drive signal S1.
At first, Fig. 6 (a) represents with respect to described supply voltage V1, the oscillogram of the described drive signal S1 under the suitable situation of the amplitude of described drive signal S1.Usually, described drive signal S1 is designed to the distortion a little than described supply voltage V1.
On the other hand, Fig. 6 (b) expression is for than the fast and oscillogram described drive signal S1 under described supply voltage V1 set greatly situation of the rotary speed of the described motor 1 of Fig. 6 (a).As mentioned above, even switch described supply voltage V1, the amplitude of described drive signal S1 also is fixed.In this case, because described drive signal S1 is lower than described supply voltage V1, described motor 1 driving force deficiency can not reach the rotary speed of setting.In addition, in described output amplifier 5, produce heat, need the heat release countermeasure corresponding to the potential difference of described supply voltage V1 and described drive signal S1.
In addition, Fig. 6 (c) expression is for than the slow and oscillogram described drive signal S1 under described supply voltage V1 set for a short time situation of the rotary speed of the described motor 1 of Fig. 6 (a).In this case, described drive signal S1 is serious distortion in surpassing the zone of described supply voltage V1, becomes the essentially rectangular ripple.Therefore, the variation of described drive signal S1 is rapid, produces noise.
Summary of the invention
Given this, motor drive circuit of the present invention is characterized in that, comprising: testing circuit, thereby the rotatable phase output detection signal of detection motor; Amplifying circuit, thus described detection signal output amplification detection signal amplified; And output amplifier, thereby amplify described amplification detection signal output drive signal according to supply voltage, the amplitude variations of described drive signal is so that the ratio of saturation time and unsaturation time keeps certain value.
In the motor drive circuit of the present invention, according to supply voltage, the amplitude variations of drive signal is so that the ratio of saturation time and unsaturation time keeps certain value.Therefore, can obtain the amplitude of the drive signal that adapts with the motor rotary speed, can suppress to generate heat, the generation of noise.
Description of drawings
Fig. 1 represents the circuit diagram of the motor drive circuit of embodiment of the present invention.
The oscillogram of the drive signal of Fig. 2 (a)～(c) expression embodiment of the present invention.
Fig. 3 represents the circuit diagram of the voltage conversion circuit of embodiment of the present invention.
Fig. 4 represents the circuit diagram of the motor drive circuit of other execution modes of the present invention.
Fig. 5 represents the circuit diagram of the motor drive circuit of prior art.
The oscillogram of the drive signal of Fig. 6 (a)～(c) expression prior art.
Embodiment
Below describe motor drive circuit of the present invention in detail.
Fig. 1 represents an example of motor drive circuit of the present invention.Motor 1, Hall element 3, Hall amplifier 4 and output amplifier 5 form feedback loop, the described motor 1 of Linear Driving.At this, the rotary speed of described motor 1 is Be Controlled according to being applied to the supply voltage V1 of described output amplifier 5.At this, described supply voltage V1 is adjusted to corresponding to the value of the rotary speed of setting by speed control circuit 6 and is output.Then, set amplifier 8 via voltage conversion circuit 7 and bias voltage, described supply voltage V1 becomes the Hall bias voltage V2 that is applied to described Hall element 3.Below, specify motor drive circuit of the present invention.
Motor 1 is the brushless single phase motor with winding 2.Described motor 1 is equipped with rotor magnet on the rotor, according to the drive signal S1 rotation that is applied to described winding 2.
Hall element 3 is configured in the suitable position that the rotor magnet of described motor 1 passes through, and detects the rotatable phase of described motor 1, output detection signal S2.That is, described Hall element 3 is owing to the certain electric current of energising, and a terminal of energising usefulness is applied in the Hall bias voltage V2 of regulation via the first bias resistance Ra.On the other hand, another terminal of energising usefulness is connected to ground via the second bias resistance Rb.Thereby described Hall element 3 is exported the detection signal S2 of the sine voltage of antiphases according to the variation of following the magnetic flux density of passing through to produce of rotor magnet from two lead-out terminals.Described Hall element 3 for example is made of GaAs (GaAs), indium antimonide (InSb).At this, the amplitude of described detection signal S2 depends on the described Hall bias voltage V2 that is applied to the described first bias resistance Ra.In the motor drive circuit of the present invention, as described later, described Hall bias voltage V2 suitably changes according to the supply voltage V1 that sets corresponding to the motor rotary speed that is made as target.That is, can change the amplitude of described detection signal S2 according to described supply voltage V1.
Hall amplifier 4 amplifies described detection signal S2, output amplification detection signal S3.That is, apply the output of described Hall element 3, apply the counter-rotating output of described Hall element 3 at the counter-rotating input terminal at the non-counter-rotating input terminal of described Hall amplifier 4.Thereby, the sine-shaped amplification detection signal S3 that has been exaggerated from the amplitude of the described detection signal S2 of described Hall amplifier 4 outputs.
Output amplifier 5 amplifies described amplification detection signal S3, output drive signal S1 according to the described supply voltage V1 that is applied in.That is, the amplification degree of the value of described supply voltage V1 and described detection signal S2 is proportional.In addition, described supply voltage V1 is given for the input voltage range of described output amplifier 5 regular events.That is, under the situation of voltage above the scope of described supply voltage V1 of described amplification detection signal S3, the described drive signal S1 that exports from described output amplifier 5 becomes essentially rectangular in the scope that surpasses described supply voltage V1.
At this, described supply voltage V1 is set by speed control circuit 6 according to the rotary speed that is made as the motor of target.Specifically, under the rotary speed of the motor situation faster than benchmark, described supply voltage V1 is set greatly, and under the situation slower than benchmark, described supply voltage V1 is set for a short time.
In motor drive circuit of the present invention, described supply voltage V1 also is applied to voltage conversion circuit 7.Described supply voltage V1 is transformed into voltage of transformation V3 corresponding to described supply voltage V1 by described voltage conversion circuit 7, is input to bias voltage and sets amplifier 8.In addition, this bias voltage setting amplifier 8 also is transfused to described amplification detection signal S3.Thereby described bias voltage is set amplifier 8 more described voltage of transformation V3 and described amplification detection signal S3, exports the described Hall bias voltage V2 of described Hall element 3.
That is, in motor drive circuit of the present invention, corresponding to the described supply voltage V1 that is set, described Hall bias voltage V2 also changes.Therefore, the gain of described detection signal S2 changes according to described supply voltage V1, accompanies therewith, and the amplitude of described amplification detection signal S3 and described drive signal S1 also changes.
Fig. 2 represents from the oscillogram of the described drive signal S1 of described output amplifier 5 outputs.
At first, Fig. 2 (a) represents with respect to described supply voltage V1, the oscillogram of the described drive signal S1 under the suitable situation of the amplitude of described drive signal S1.Usually, described drive signal S1 is designed to the distortion a little than described supply voltage V1.This produces the heating corresponding to the potential difference of described supply voltage V1 and described drive signal S1 under the situation of described supply voltage V1 greater than described drive signal S1.On the other hand, under the situation of described supply voltage V1 less than described drive signal S1, described drive signal S1 is in the scope distortion that surpasses described supply voltage V1, so owing to the variation of described drive signal S1 sharply produces noise.At this, because heating needs heat release countermeasure etc., so be the problem that more should prevent than noise.Therefore, focus on heating is suppressed to minimum, it is smaller a little than described drive signal S1 to be designed to described supply voltage V1, so that balance the best of heating and noise.At this, under the state that keeps this balance, the saturation time that defines described driving voltage is that t1, unsaturation time are t2.
In addition, Fig. 2 (b) expression is for than the fast and oscillogram described drive signal S1 under described supply voltage V1 set greatly situation of the rotary speed of the described motor 1 of Fig. 2 (a).As mentioned above, in the motor drive circuit of the present invention, described Hall bias voltage V2 becomes big corresponding to described supply voltage V1.Under this situation, the amplitude of described detection signal S2 also becomes big corresponding to described supply voltage V1.Therefore, depend on the described amplification detection signal S3 of described detection signal S2 and the amplitude of described drive signal S1 and also become big corresponding to described supply voltage V1.At this, preferably set described Hall bias voltage V2 and change, so that t1 among the ratio of the saturation time t3 of described drive signal S1 and unsaturation time t4 and Fig. 2 (a) and the ratio of t2 equate.Have again, regulate by described voltage conversion circuit 7 corresponding to the variation of the described Hall bias voltage V2 of described supply voltage V1.Under this situation, the balance corresponding to the generation of the noise of each supply voltage V1 and heating can be remained the best.
In addition, Fig. 2 (c) expression is for than the slow and oscillogram described drive signal S1 under described supply voltage V1 set for a short time situation of the rotary speed of the described motor 1 of Fig. 2 (a).Described Hall bias voltage V2 diminishes corresponding to described supply voltage V1.Under this situation, the amplitude of described detection signal S2 also diminishes corresponding to described supply voltage V1.Therefore, depending on the described amplification detection signal S3 of described detection signal S2 and the amplitude of drive signal S1 also diminishes corresponding to described supply voltage V1.At this, preferably with Fig. 2 (b) similarly, set described Hall bias voltage V2 and change, so that the t1 of the ratio of the saturation time t5 of described drive signal S1 and unsaturation time t6 and Fig. 2 (a) and the t3 among t2 and Fig. 2 (b) and the ratio of t4 equate.
Fig. 3 represents an example of described voltage conversion circuit 7.
This voltage conversion circuit 7 constitutes, and it is certain described voltage of transformation V3 that described supply voltage V1 is transformed into the ratio that makes described saturation time and unsaturation time.Below, specify this circuit.
Base stage at transistor Q1 produces the voltage V4 that sets by the described supply voltage V1 of the electric resistance partial pressure of resistance R 1 and resistance R 2.Here, described transistor Q1 has identical emitter-to-base voltage with transistor Q2.Therefore, roughly voltage V4 also takes place in the emitter at described transistor Q2.And transistor Q3 and transistor Q4 constitute mirror image circuit.Therefore, produce the voltage V5 that sets by the resistance ratio of the image ratio of described transistor Q3 and described transistor Q4 and resistance R 3 and resistance R 4 at the collector electrode of described transistor Q4.And transistor Q5 has identical emitter-to-base voltage with transistor Q6.Therefore, roughly voltage V5 also takes place in the emitter at described transistor Q6.Here, be applied in the level shift voltage Vr that can set arbitrarily on the resistance R 5.Therefore, described supply voltage V1 is transformed into described voltage of transformation V3 by described level shift voltage Vr and exports from the efferent of this voltage conversion circuit 7.That is, described voltage of transformation V3 can change corresponding to described supply voltage V1, and is adjusted to the saturation time that satisfies aforesaid described drive signal S1 and the ratio of unsaturation time by described level shift voltage Vr.
More than, in motor drive circuit of the present invention, when described supply voltage V1 was changed, the amplitude variations of described drive signal S1 was so that the ratio of the saturation time of described drive signal S1 and unsaturation time keeps certain value.Therefore, even the rotary speed of switching motor also can suppress heating, noise.
Have, it only is illustration and non-limiting in all respects that this disclosed execution mode is interpreted as again.Scope of the present invention can't help above-mentioned execution mode explanation and represent by the scope of claim, and comprise and the equal meaning of the scope of claim and all changes in the scope.
For example, in the above-described embodiment, by described Hall bias voltage V2 changes corresponding to described supply voltage V1, the amplitude variations of described drive signal S1 is so that the ratio of saturation time and unsaturation time keeps certain value.Yet, the invention is not restricted to this, also can constitute the amplitude variations that makes described drive signal S1 with other method.
Fig. 4 represents the motor drive circuit of other execution modes of the present invention.
In the present embodiment, the Hall current 11 that flows through in the Hall element 3 does not constitute and changes according to supply voltage V1, and is controlled to be below the ormal weight by Hall current circuit 9.That is, the internal resistance of described Hall element 3 has deviation for each element, and this internal resistance is according to variations in temperature.Under this situation, for example under the situation of described internal resistance greater than design load, described Hall current I1 is lower than setting, can not detect the magnetic field based on the rotation of described motor 1 fully.On the other hand, under the situation of described internal resistance less than design load, described Hall current I1 surpasses setting, and described Hall element 3 is destroyed owing to generate heat.Therefore, described Hall current circuit 9 is set in the motor drive circuit of present embodiment, this Hall current circuit 9 is exported best described Hall current I1 according to the internal resistance of described Hall element 3.This Hall current circuit 9 for example is made of at the clamp circuit of setting the low voltage output circuit of the Hall bias voltage of exporting constant voltage, the current clamp that this low voltage output circuit is exported.
And in the present embodiment, described supply voltage V1 sets power connector end that amplifier 18 is connected to described Hall amplifier 4 via voltage conversion circuit 7 and magnification ratio.Thereby the voltage amplification degree of described Hall amplifier 4 is set by the magnification ratio setting voltage V4 that is applied to power connector end 10.
That is, in the present embodiment, described supply voltage V1 is transformed into voltage of transformation V3 corresponding to described supply voltage V1 by described voltage conversion circuit 7, and is input to magnification ratio and sets amplifier 18.In addition, this magnification ratio setting amplifier 18 also is transfused to described amplification detection signal S3.Then, described magnification ratio is set amplifier 18 more described voltage of transformation V3 and described amplification detection signal S3, output magnification ratio setting voltage V4.Then, described magnification ratio setting voltage V4 is applied to described power connector end 10 of described Hall amplifier 4, and the voltage amplification degree of described Hall amplifier 4 is changed.
That is, in the present embodiment, corresponding to the described supply voltage V1 that sets, the voltage amplification degree of described Hall amplifier 4 also changes.Therefore, the amplitude of described amplification detection signal S3 changes corresponding to described supply voltage V1, accompanies therewith, and the amplitude of described drive signal S1 also changes.At this moment, in the present embodiment, described drive signal S1 also changes, so that the ratio of saturation time and unsaturation time keeps certain value.
Have again, the situation of brushless single phase motor more than has been described, but the present invention is suitable under the situation of 2 phase brushless motors, 3 phase brushless motors etc. too.
Claims (7)
1. a motor drive circuit is characterized in that, comprising:
Testing circuit, thereby the rotatable phase output detection signal of detection motor;
Amplifying circuit, thus described detection signal output amplification detection signal amplified; And
Output amplifier, thus described amplification detection signal output drive signal amplified according to supply voltage,
The amplitude variations of described drive signal is so that the ratio of saturation time and unsaturation time keeps certain value.
2. motor drive circuit as claimed in claim 1 is characterized in that, described testing circuit makes the amplitude variations of described detection signal according to described supply voltage.
3. motor drive circuit as claimed in claim 1 is characterized in that described amplifying circuit amplifies described detection signal according to described supply voltage.
4. motor drive circuit as claimed in claim 2 is characterized in that, also comprises:
Voltage conversion circuit, output is corresponding to the voltage of transformation of described supply voltage; And
Bias voltage is set amplifier, described voltage of transformation as an input, imported described amplification detection signal as another,
The output of described bias voltage setting amplifier becomes the Hall bias voltage of the Hall element that is applied to described testing circuit.
5. motor drive circuit as claimed in claim 3 is characterized in that, also comprises:
Voltage conversion circuit, output is corresponding to the voltage of transformation of described supply voltage; And
Magnification ratio is set amplifier, described voltage of transformation as an input, imported described amplification detection signal as another,
The output of described magnification ratio setting amplifier changes the gain of described amplifying circuit.
6. motor drive circuit as claimed in claim 1 is characterized in that, described supply voltage is switched according to the rotary speed that is made as the motor of target.
7. motor drive circuit as claimed in claim 3 is characterized in that, described detection signal detects by the Hall element that constitutes described testing circuit,
The Hall current that flows through in the described Hall element is adjusted, so that be no more than setting.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006148409A JP4979272B2 (en) | 2006-05-29 | 2006-05-29 | Motor drive circuit |
| JP148411/06 | 2006-05-29 | ||
| JP148409/06 | 2006-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101083446A true CN101083446A (en) | 2007-12-05 |
| CN100559695C CN100559695C (en) | 2009-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100887015A Expired - Fee Related CN100559695C (en) | 2006-05-29 | 2007-03-20 | Motor drive circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4979272B2 (en) |
| CN (1) | CN100559695C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610058B (en) * | 2008-06-20 | 2012-04-04 | 三洋电机株式会社 | Motor drive circuit |
| CN103546078A (en) * | 2012-07-12 | 2014-01-29 | 三星电子株式会社 | Motor driving signal generation system and method thereof, and method for controlling vibration thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5764340B2 (en) * | 2010-03-25 | 2015-08-19 | ローム株式会社 | Motor drive circuit, cooling device using the same, and electronic device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530780A (en) * | 1991-07-15 | 1993-02-05 | Rohm Co Ltd | Motor controlling circuit and motor controller |
| JP3716064B2 (en) * | 1996-12-17 | 2005-11-16 | 株式会社日本計器製作所 | Fan motor drive circuit |
| JP2001190084A (en) * | 1999-12-28 | 2001-07-10 | Japan Servo Co Ltd | Driving circuit of motor |
-
2006
- 2006-05-29 JP JP2006148409A patent/JP4979272B2/en active Active
-
2007
- 2007-03-20 CN CNB2007100887015A patent/CN100559695C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610058B (en) * | 2008-06-20 | 2012-04-04 | 三洋电机株式会社 | Motor drive circuit |
| CN103546078A (en) * | 2012-07-12 | 2014-01-29 | 三星电子株式会社 | Motor driving signal generation system and method thereof, and method for controlling vibration thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4979272B2 (en) | 2012-07-18 |
| CN100559695C (en) | 2009-11-11 |
| JP2007318965A (en) | 2007-12-06 |
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Granted publication date: 20091111 Termination date: 20130320 |