CN201039058Y - Brushless DC motor locking protection loop - Google Patents
Brushless DC motor locking protection loop Download PDFInfo
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- CN201039058Y CN201039058Y CNU2007200011213U CN200720001121U CN201039058Y CN 201039058 Y CN201039058 Y CN 201039058Y CN U2007200011213 U CNU2007200011213 U CN U2007200011213U CN 200720001121 U CN200720001121 U CN 200720001121U CN 201039058 Y CN201039058 Y CN 201039058Y
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Abstract
The utility model relates to a no-brush DC motor locking protection loop, comprising a PWM driving IC component which is electrically connected with a motor coil; the PWM driving IC component can control the rotation speed of the motor; the utility model also comprises a conversion circuit which is electrically connected with the PWM driving IC component, and an operation signal terminal which is electrically connected between the PWM driving IC component and the conversion circuit; the operation signal terminal is also connected with an operation signal source; the utility model is characterized in that the operation signal terminal can introduce an operation signal arranged between the PWM driving IC component and the conversion circuit; when the motor is locked, the operation signal source outputs a signal to set up a prearranged voltage at the operation signal terminal at once, in order to maintain the motor running in prearranged low rotation speed mode. The utility model can avoid the operation temperature of the PWM driving IC component being sharply increased and avoid the operation current of the motor being sharply increased, and has the efficacy of protecting the PWM driving IC component.
Description
Technical field
The utility model relates to brushless DC motor locking protection circuit; be meant especially and a kind of between a PWM driver IC package and a change-over circuit, the connection introduce a running signal; when motor pinned, this running signal can be kept the brushless DC motor locking protection circuit of motor at the desired speed mode operation.
Background technology
As shown in Figure 1, commonly use Brushless DC motor and have a motor drive circuit 1 and be connected to a motor coil 2, excitatory so that control motor coil 2 carries out alternation, so just can drive a motor rotor and produce rotation.Motor drive circuit 1 comprises a PWM driver IC package 10, a Hall IC assembly 11 and a change-over circuit 12.PWM driver IC package 10 is electrically connected to Hall IC assembly 11, surveys signal so that receive the rotor of Hall IC assembly 11.PWM driver IC package 10 has a pin VTH, and pin VTH is electrically connected to change-over circuit 12.Change-over circuit 12 has a PWM input 121, it connects input one PWM signal, so the PWM signal is after change-over circuit 12 is converted to voltage signal, again voltage signal is inputed to the pin VTH of PWM driver IC package 10, so that decision motor coil 2 carries out the excitatory cycle of alternation, so just can control the rotating speed of motor rotor.
Because motor operation state comprises fast state, low speed (being lower than at full speed) operating condition and stops (zero rotating speed) state.Therefore PWM driver IC package 10 can be according to the operating condition of input PWM signal decision motor, so that motor can suitably be adjusted rotating speed according to system requirements.For example, when the current potential of the pin VTH of PWM driver IC package 10 was higher than 3.6V, PWM driver IC package 10 was controlled at halted state with motor, and promptly rotating speed is 0RPM.When the current potential of pin VTH was lower than 2.0V, PWM driver IC package 10 was controlled at the state of running up with motor, and promptly rotating speed is 6000RPM.When the current potential of pin VTH during between 3.6V to 2.0V, PWM driver IC package 10 is controlled at low speed state with motor, and promptly rotating speed is greater than 0RPM but less than 6000RPM.
Again as shown in Figure 1, on circuit arrangement, a capacitor 3 in parallel between PWM driver IC package 10 and change-over circuit 12, the direct ground connection of capacitor 3 one ends, it is used for the sawtooth waveforms of change-over circuit 12 inputs is put in order ripple, so just can stablize the current potential of the pin VTH of PWM driver IC package 10.When motor turns round, the rotating speed of the electrical potential energy of the pin VTH of PWM driver IC package 10 decision motor.
Shown in Fig. 2 A, Fig. 2 B, PWM driver IC package 10 controllable motor of motor are high rotating speed pattern (high-speed mode) or slow-speed of revolution pattern (low-speed mode).During motor ran well, when the current potential of pin VTH maintained 3.0V (current potential is lower than 3.6V but is higher than 2.0V), the rotating speed of motor maintained 2000RPM, and promptly motor enters slow-speed of revolution pattern.In addition, when the current potential of pin VTH was 0V (current potential is lower than 2.0V), motor then was high rotating speed pattern.
Yet because capacitor 3 forms ground connection (shown in Fig. 1 and Fig. 2 A), therefore when motor starting, the current potential of capacitor 3 is inevitable to begin to charge by zero.At this moment, the pin VTH of PWM driver IC package 10 also is a zero potential, and shown in Fig. 2 A, so motor is in high rotating speed pattern during motor starting, and promptly motor one starts rotating speed and jumps immediately to 6000RPM (at a high speed) (shown in Fig. 2 B).
For another example shown in Fig. 1, Fig. 2 B, in case during motor starting, motor enters high rotating speed pattern immediately, thereby is increasing rapidly under the rotating speed, motor not only produces noise and vibrations, and produces great assembly friction, thereby increases the motor sub-assembly consume.
Shown in Fig. 2 A, Fig. 2 B, after capacitor 3 chargings, the current potential of capacitor 3 reaches 3V gradually for another example.At this moment, the current potential of the pin VTH of PWM driver IC package 10 is higher than 2.0V but is lower than 3.6V, so motor will stop high rotating speed pattern, and the rotating speed of motor can be reduced to desired speed or slow-speed of revolution 2000RPM.
Yet, when system just started shooting, just motor was when starting, and its internal system temperature does not reach the condition of high temperature as yet, therefore PWM driver IC package 10 rises sharply motor rotary speed to 6000RPM (fast state) and does not meet the demand of operate as normal, and has the shortcoming of improper consume energy.Therefore commonly using the PWM motor is necessary further improvement, promptly enters fast state to avoid motor one to start.
Start the problem that promptly enters fast state in order to solve motor one, the applicant is in " the PWM motor drive circuit " of No. the 94133994th, the TaiWan, China application for a patent for invention of having declared, utilization is a capacitor in parallel between a PWM driver IC package and a change-over circuit, one end of capacitor is connected in a voltage source, when motor starting, its pin VTH that can avoid in the PWM driver IC package produces zero potential, prevents that motor one from starting the high rotating speed pattern that promptly enters.
Again as shown in Figure 1, when motor ran well, the PWM driver IC package 10 of motor only produced normal operating temperature.For example, when the revolution electric current of motor was 0.543A, the operating temperature of PWM driver IC package 10 only reached 36 ℃, its unlikely damage PWM driver IC package 10.In the time of can't turning round in case motor takes place stuck, because the revolution electric current of the high rotating speed pattern of still normal input is to the PWM driver IC package 10 of motor, thereby cause the operating temperature of the PWM driver IC package 10 of motor constantly to raise, even cause the revolution electric current of motor that synchronous rising also takes place.For example, when the normal operating current of motor was 0.543A, in the time of can't turning round in case motor takes place stuck, the operating temperature of PWM driver IC package 10 is rapid to be increased to 73.1 ℃, and the revolution electric current of motor also is increased to 1.086A synchronously, causes PWM driver IC package 10 to damage easily.
Summary of the invention
At the problems referred to above, main purpose of the present utility model is to provide a kind of brushless DC motor locking protection circuit, and it has the effect of protection PWM driver IC package.
Another object of the present invention is to provide a kind of brushless DC motor locking protection circuit, it has the effect that prevents the rapid rising of motor running current when motor pins.
For achieving the above object, a kind of brushless DC motor locking protection circuit provided by the utility model, it comprises: a PWM driver IC package, it is electrically connected to a motor coil, the rotating speed of described PWM driver IC package controllable motor; One change-over circuit, it is electrically connected to described PWM driver IC package; One running signal end, it is electrically connected between described PWM driver IC package and the change-over circuit, and described running signal end connects a running signal source in addition; It is characterized in that: described running signal end connects between described PWM driver IC package and described change-over circuit introduces a running signal, when motor pins, a signal is exported in described running signal source makes running signal end set up a predetermined voltage immediately, to keep described motor at predetermined slow-speed of revolution mode operation.
Described running signal source is a pin that is disposed at described PWM driver IC package.
Other comprises at least one Zener diode, and described running signal end is connected to described running signal source through described Zener diode.
Described PWM driver IC package has one first pin, one second pin and one the 3rd pin, described running signal source is for being disposed at described the 3rd pin, described the 3rd pin is connected to described second pin through a resistance, to provide a predetermined voltage to described running signal end.
Other comprises at least one capacitor, and it is parallel between described PWM driver IC package and the change-over circuit, and described capacitor connects a voltage source in addition; When described motor starting, described capacitor has a predetermined potential makes described PWM driver IC package prevent that motor from entering high rotating speed pattern immediately, and described capacitor is also controlled described PWM driver IC package makes motor rotary speed gradually from zero rotating speed speedup to a desired speed.
Described PWM driver IC package has one first pin and one second pin, and described capacitor cross-over connection is between described first pin and second pin.
Described capacitor adopts a plurality of capacitor cell parallel connections, is composed in series.
Adjust the capacitance of described capacitor, the also corresponding adjustment of the time span of the acceleration phase buffer of described PWM driver IC package.
Described capacitor constitutes one of described PWM driver IC package and quickens phase buffer, makes described motor through behind the described acceleration phase buffer, and its rotating speed just can reach desired speed.
Adopt technique scheme; the utility model connects between a PWM driver IC package and a change-over circuit introduces a running signal; when motor pins; the running signal can be set up a predetermined voltage makes motor still maintain a predetermined slow-speed of revolution mode operation; to avoid taking place the rapid rising of operating temperature of PWM driver IC package; and the phenomenon of the rapid rising of motor running current, have the effect of protecting the PWM driver IC package.
Description of drawings
Fig. 1 is a circuit diagram of commonly using the PWM motor drive circuit;
Fig. 2 A commonly uses the PWM motor drive circuit produces current potential at the pin of driver IC package schematic diagram;
Fig. 2 B is a schematic diagram of commonly using the driver IC package output speed of PWM motor drive circuit;
Fig. 3 is the circuit diagram of the utility model preferred embodiment;
Fig. 4 is the circuit diagram of another preferred embodiment of the utility model;
Embodiment
In order to describe structure of the present utility model and characteristics in detail, existing following preferred embodiment of act and conjunction with figs. are described as follows.
As shown in Figure 3, the circuit diagram of the brushless DC motor locking protection circuit that is provided for the utility model preferred embodiment.Motor drive circuit 1 has a locking protection circuit.In case take place that motor pins or when stuck, it is used to protect motor drive circuit 1.Motor drive circuit 1 is electrically connected to a motor coil 2, and motor coil 2 can adopt single phase winding, two-phase coil or three-phase coil etc.Motor drive circuit 1 comprises a PWM driver IC package 10, a Hall IC assembly 11, a change-over circuit 12, at least one electric capacity 3 ' and a running signal end 4.So, the configuration of running signal end 4 constitutes locking protection circuit.Motor drive circuit 1 is used to drive conducting motor coil 2, so that motor coil 2 can produce an alternating magnetic field.
The input of PWM driver IC package 10 is electrically connected to Hall IC assembly 11.PWM driver IC package 10 has one first pin 101, one second pin 102 and one the 3rd pin 103.First pin (VTH) 101 is electrically connected to change-over circuit 12 and is used to import the PWM signal.102 of second pins are used to provide a predetermined voltage to change-over circuit 12 and capacitor 3 '.103 outputs of the 3rd pin (RD), one running signal is used to determine whether to set up the predetermined voltage of running signal end 4.And the 3rd pin 103 also is connected to second pin, 102, the three pins 103 by a resistance R 1 and also is connected between first pin and the change-over circuit 12 through being connected in series a Zener diode 41 again, to form a running signal end 4.When motor the 3rd pin 103 output low (Low) current potential signals when running well, the signal end 4 that then turns round does not have voltage and sets up.Opposite, the 3rd pin 103 can be exported high (High) current potential signal when motor mal-operation (deadlock), and it can make running signal end 4 set up a predetermined voltage.
Again as shown in Figure 3, when motor started at the beginning, first pin 101 of PWM driver IC package 10 can be connected to second pin 102 by capacitor 3 ' and form a predetermined voltage, for example 6V voltage.Motor began accelerated service and capacitor 3 ＇ and also began discharge this moment.When the current potential of first pin 101 maintained predetermined 3.0V (current potential is lower than 3.6V but is higher than 2.0V), the rotating speed of motor maintained 2000RPM, and promptly motor enters the desired speed pattern.
When motor starting, the current potential of first pin 101 of PWM driver IC package 10 is 6V.Then, because first pin 101 connects a capacitor 3 ＇, so current potential can drop to predetermined 3V.Relative, when motor starting, its rotating speed is zero.Then, the rotating speed of motor increases to 2000RPM or desired speed gradually by zero rotating speed.In brief, when starter, PWM driver IC package 10 has one and quickens phase buffer, but so that motor speedup to a desired speed.
Again as shown in Figure 3, Hall IC assembly 11 is used to provide rotor to survey signal to PWM driver IC package 10, so that PWM driver IC package 10 suitable conducting motor coils 2, motor coil 2 like this can drive rotor and be rotated.Simultaneously, the 3rd pin 103 exportable running signals of PWM driver IC package 10 are with the foundation of control running signal end 4 voltages.
Capacitor 3 ' is connected in parallel between first pin 101 and change-over circuit 12 of PWM driver IC package 10, and capacitor 3 ' also can adopt a plurality of capacitor cells parallel connections or be composed in series.Simultaneously, capacitor 3 ' cross-over connection is between first pin 101 and second pin 102 of PWM driver IC package 10.Perhaps capacitor 3 ' also can select to be directly connected in a voltage source.
The capacitance of capacitor 3 ' can be adjusted according to product demand, so that adjust the time span of the acceleration phase buffer of PWM driver IC package 10.So, motor is through after quickening phase buffer, and its rotating speed can reach desired speed, to avoid producing improper hastening phenomenon.
As shown in Figure 3, when motor runs well, the 3rd pin 103 output electronegative potential signals of PWM driver IC package 10, therefore the electric current that has second pin 102 of 6V voltage can't be through resistance 104 (R1) Zener diode 41 of flowing through, just can't set up a voltage, so it can not influence the current potential of first pin 101 when motor runs well at first pin 101 of PWM driver IC package 10 and the power signal end 4 between the change-over circuit 12.
Opposite, when motor generation mal-operation or pinning, the 3rd pin 103 of PWM driver IC package 10 can be exported high (High) current potential signal, can flow through Zener diode 41 to power signal end 4 so that have the electric current of second pin 102 of 6V voltage, make power signal end 4 set up a predetermined voltage, so the high potential signal of the 3rd pin 103 can be used for setting up the predetermined potential of first pin 101, thereby make motor when pinning is stuck, still can maintain predetermined slow-speed of revolution mode operation.
When motor restarted again, the current potential of capacitor 3 ' (being the current potential of first pin 101 of PWM driver IC package 10) was reduced to 3V gradually from 6V.Relative, the rotating speed of motor starts from zero rotating speed (halted state), and through quickening phase buffer, increases to 2000RPM or desired speed at last.In case motor can be got rid of when pinning, the 3rd pin 103 of PWM driver IC package 10 promptly is output as the electronegative potential signal, the electronegative potential signal can make the former loss of voltage that is based upon running signal end 4 when motor pins, and so, the rotating speed of motor promptly recovers normal rotating speed pattern.
When motor ran well, the PWM driver IC package 10 of motor only produced normal operating temperature.For example, when the revolution electric current of motor was 0.543A, the operating temperature of PWM driver IC package 10 only was 36 ℃, its unlikely damage PWM driver IC package 10.In case when motor took place by stuck can't the running, motor can switch to a predetermined slow-speed of revolution pattern immediately.At this moment, owing to only import the PWM driver IC package 10 of less revolution electric current to motor, thereby only cause the operating temperature of the PWM driver IC package 10 of the motor that slightly raises.For example, when the revolution electric current of motor is 0.543A, in case when motor took place by stuck can't the running, the revolution electric current of motor was reduced to 0.069A immediately, thereby the operating temperature of PWM driver IC package 10 only is increased to 39.2 ℃, the unlikely damage that causes PWM driver IC package 10.
As shown in Figure 4, the circuit diagram of the brushless DC motor locking protection circuit that is provided for another preferred embodiment of the utility model.As shown in Figure 4, the last relatively embodiment of present embodiment has reduced electric capacity 3 ', so motor drive circuit 1 only comprises a PWM driver IC package 10, a Hall IC assembly 11, a change-over circuit 12 and a running signal end 4.When in case present embodiment can reach motor generation mal-operation or pinning equally, the output high potential signal of the 3rd pin 103 of PWM driver IC package 10 is to set up a voltage between first pin 101 that is controlled to PWM driver IC package 10 and the change-over circuit 12, so an exportable high potential signal when motor pins of the 3rd pin 103 is used to set up a predetermined potential of first pin 101, so that the rotating speed of motor still can maintain a predetermined slow-speed of revolution pattern.
Though the utility model has utilized the foregoing description to have been described in detail; right its can not be used for limiting protection range of the present utility model; any personage who has the knack of this skill; in not breaking away from creation spirit of the present utility model and scope; when making various changes and modification, therefore protection range of the present utility model should be as the criterion with the scope that claims were defined.
Claims (8)
1. brushless DC motor locking protection circuit, it comprises:
One PWM driver IC package, it is electrically connected to a motor coil, the rotating speed of described PWM driver IC package controllable motor;
One change-over circuit, it is electrically connected to described PWM driver IC package;
One running signal end, it is electrically connected between described PWM driver IC package and the change-over circuit, and described running signal end connects a running signal source in addition;
It is characterized in that: described running signal end connects between described PWM driver IC package and described change-over circuit introduces a running signal, dispose a pin as described running signal source in described PWM driver IC package, when motor pins, described running signal source is exported a signal and is set up a predetermined voltage at running signal end, keeps described motor at predetermined slow-speed of revolution mode operation.
2. brushless DC motor locking protection circuit as claimed in claim 1 is characterized in that: other comprises at least one Zener diode, and described running signal end is connected to described running signal source through described Zener diode.
3. brushless DC motor locking protection circuit as claimed in claim 2; it is characterized in that: described PWM driver IC package has one first pin, one second pin and one the 3rd pin; described running signal source is for being disposed at described the 3rd pin; described the 3rd pin is connected to described second pin through a resistance, to provide a predetermined voltage to described running signal end.
4. brushless DC motor locking protection circuit as claimed in claim 1 is characterized in that: other comprises at least one capacitor, and it is parallel between described PWM driver IC package and the change-over circuit, and described capacitor connects a voltage source in addition; When described motor starting, described capacitor has a predetermined potential makes described PWM driver IC package prevent that motor from entering high rotating speed pattern immediately, and described capacitor is also controlled described PWM driver IC package makes motor rotary speed gradually from zero rotating speed speedup to a desired speed.
5. brushless DC motor locking protection circuit as claimed in claim 4 is characterized in that: described PWM driver IC package has one first pin and one second pin, and described capacitor cross-over connection is between described first pin and second pin.
6. brushless DC motor locking protection circuit as claimed in claim 4 is characterized in that: described capacitor adopts a plurality of capacitor cell parallel connections, is composed in series.
7. brushless DC motor locking protection circuit as claimed in claim 6 is characterized in that: adjust the capacitance of described capacitor, the also corresponding adjustment of the time span of the acceleration phase buffer of described PWM driver IC package.
8. brushless DC motor locking protection circuit as claimed in claim 4 is characterized in that: described capacitor constitutes one of described PWM driver IC package and quickens phase buffer, makes described motor through behind the described acceleration phase buffer, and its rotating speed just can reach desired speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200011213U CN201039058Y (en) | 2007-01-19 | 2007-01-19 | Brushless DC motor locking protection loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200011213U CN201039058Y (en) | 2007-01-19 | 2007-01-19 | Brushless DC motor locking protection loop |
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| Publication Number | Publication Date |
|---|---|
| CN201039058Y true CN201039058Y (en) | 2008-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200011213U Expired - Fee Related CN201039058Y (en) | 2007-01-19 | 2007-01-19 | Brushless DC motor locking protection loop |
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| Country | Link |
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| CN (1) | CN201039058Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882460A (en) * | 2011-07-13 | 2013-01-16 | 东芝开利株式会社 | Inverter device |
| CN105846755A (en) * | 2015-01-14 | 2016-08-10 | 南京德朔实业有限公司 | Electric tool and motor control method |
-
2007
- 2007-01-19 CN CNU2007200011213U patent/CN201039058Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882460A (en) * | 2011-07-13 | 2013-01-16 | 东芝开利株式会社 | Inverter device |
| CN102882460B (en) * | 2011-07-13 | 2015-07-15 | 东芝开利株式会社 | Inverter device |
| CN105846755A (en) * | 2015-01-14 | 2016-08-10 | 南京德朔实业有限公司 | Electric tool and motor control method |
| CN105846755B (en) * | 2015-01-14 | 2019-04-19 | 南京德朔实业有限公司 | The control method of electric tool and motor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20110119 |