CN205141642U - Brushless DC motor's protection circuit and controlling means - Google Patents
Brushless DC motor's protection circuit and controlling means Download PDFInfo
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- CN205141642U CN205141642U CN201520946016.1U CN201520946016U CN205141642U CN 205141642 U CN205141642 U CN 205141642U CN 201520946016 U CN201520946016 U CN 201520946016U CN 205141642 U CN205141642 U CN 205141642U
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- resistance
- motor
- electric capacity
- protective circuit
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Abstract
The application discloses brushless DC motor's protection circuit and controlling means, this protection circuit are applied to brushless galvanic controlling means, and controlling means is including the main control chip and the protection circuit that are used for driving brushless DC motor. The protection circuit includes according to predetermineeing sampled signal input RNF, first resistance R1, first electric capacity C1, second electric capacity C2, comparator IC2 and the switch element IC1 that the structural connection is in the same place. Magnitude of voltage as sampled signal has surpassed the protection threshold values, comparator IC2 output high level, switch element IC1 switches on, electric quantity that second electric capacity C2 stored discharges through switch element IC1's signal output part, fault -signal output FIB's voltage reduces rapidly to the low level, main control chip turn -offs its 6 way PWM drive signal's output, stop promptly driving brushless DC motor, brushless DC motor has just also stopped the production of heavy current, so as to avoids the heavy current to cause the damage to controlling means.
Description
Technical field
The application relates to technical field of motors, more particularly, relates to a kind of protective circuit and control device of brshless DC motor.
Background technology
The operation of brshless DC motor relies on control device by power component to its input multi-channel PWM drive singal.Brshless DC motor is in operation likely can because of the reason overcurrent of load or fault or short circuit, and can produce big current when there is overcurrent or short trouble, big current can cause damage to master control set, even causes burning of power component.If can the output of the multi-channel PWM drive singal of rupturing duty parts in time when brshless DC motor generation overcurrent or short circuit, big current just can be avoided control device to be caused to the damage that cannot retrieve.
Utility model content
In view of this, the application provides a kind of protective circuit and control device of brshless DC motor, for the output of the multi-channel PWM drive singal of the timely stop control when brshless DC motor generation overcurrent or short circuit, to avoid causing damage to control device.
To achieve these goals, the existing scheme proposed is as follows:
A protective circuit for brshless DC motor, is applied to the control device of described brshless DC motor, comprises:
For receiving the sampled signal input of the current signal of described brshless DC motor;
The first resistance that one end is connected with described sampled signal input;
The first electric capacity that one end is connected with the other end of described first resistance, the other end ground connection of described first electric capacity;
The comparator that positive input is connected with the other end of described first resistance, the reverse input end of described comparator is for receiving reference voltage;
The switch element that control end is connected with the output of described comparator, described switching elements conductive when described control end receives high level signal;
For connecting the fault-signal output of the fault-signal input of the main control chip of described control device;
The second electric capacity that one end is connected with described fault-signal output, the other end ground connection of described second electric capacity;
The signal input part of described switch element is connected with described fault-signal output, signal output part ground connection.
Optionally, described switch element comprises relay or triode.
Optionally, described switch element is metal-oxide-semiconductor, also comprises:
The second resistance that one end is connected with described fault-signal output, the other end of described second resistance is connected with described control end.
Optionally, the power supply circuits for powering to described fault-signal output are also comprised.
Optionally, described power supply circuits comprise:
For receiving the voltage input end of driving voltage;
The 3rd resistance that one end is connected with described voltage input end, the other end of described 3rd resistance is connected with described fault-signal output.
Optionally, the bleeder circuit for exporting described reference voltage to the reverse input end of described comparator is also comprised.
Optionally, described bleeder circuit comprises:
For receiving the branch pressure voltage input of driving voltage;
The 4th resistance that one end is connected with described branch pressure voltage output, the other end of described 4th resistance is connected with the positive input of described comparator;
The 5th resistance that one end is connected with the other end of described 4th resistance, the other end ground connection of described 5th resistance.
Optionally, also comprise:
3rd electric capacity of the other end ground connection of one end and described 4th resistance, the other end ground connection of described 3rd electric capacity.
A kind of control device, comprising the main control chip for controlling brshless DC motor, optionally, also comprising:
Protective circuit that be connected with described main control chip, as above.
As can be seen from above-mentioned technical scheme; this application discloses a kind of protective circuit and control device of brshless DC motor; this protective circuit is applied to the control device of brushless dc, and control device comprises main control chip and protective circuit for driving brshless DC motor.Protective circuit comprise link together by preset structure sampled signal input RNF, the first resistance R1, the first electric capacity C1, the second electric capacity C2, comparator IC2 and switch element IC1.When the magnitude of voltage of sampled signal has exceeded protection threshold values; comparator IC2 exports high level; switch element IC1 conducting; the electricity that second electric capacity C2 stores is discharged by the signal output part of switch element IC1; the voltage of fault-signal output FIB is reduced to low level rapidly, and main control chip turns off the output of its 6 road PWM drive singal, namely stops driving brshless DC motor; brshless DC motor also just stopped the generation of big current, thus big current can be avoided to cause damage to control device.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The circuit diagram of the protective circuit of a kind of brshless DC motor that Fig. 1 provides for the embodiment of the present application;
The circuit diagram of the protective circuit of the another kind of brshless DC motor that Fig. 2 provides for the embodiment of the present application;
The circuit diagram of the protective circuit of another brshless DC motor that Fig. 3 provides for the embodiment of the present application;
The circuit diagram of the protective circuit of a kind of brshless DC motor that Fig. 4 provides for another embodiment of the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Embodiment one
The circuit diagram of the protective circuit of a kind of brshless DC motor that Fig. 1 provides for the embodiment of the present application.
As shown in Figure 1, the protective circuit that the present embodiment provides is applied in the control device of brshless DC motor, is connected with the main control chip of control device.Specifically comprise sampled signal input RNF, the first resistance R1, the first electric capacity C1, the second electric capacity C2, comparator IC2 and switch element IC1.
Wherein, sampled signal input RNF is for receiving the current signal of brshless DC motor, and current signal by the current sensor collection of brshless DC motor, and is converted to the current signal of standard, such as 0 ~ 5 volt of voltage.
One end of first resistance R1 is connected with one end of sampled signal input RNF, the first electric capacity C1 respectively, the positive input of comparator IC2 is connected, the other end then ground connection of the first electric capacity C1.
The reverse input end of comparator IC2 is then for receiving default reference voltage, and this reference voltage is as the protection threshold value of protective circuit.The signal output part of comparator IC2 is then connected with the control end of switch element IC1, and when the voltage of the current signal that sampled signal input RNF receives exceeds reference voltage, comparator IC2 exports high level signal by its signal output part.
Fault-signal output FIB is for connecting the fault-signal input of main control chip.Fault-signal output FIB is connected with one end of the second electric capacity C2, the signal input part of switch element IC1, the other end ground connection of the second electric capacity C2, the same ground connection of signal output part of switch element IC1.When the control end of switch element IC1 is loaded high level signal, switch element IC1 is by its signal input part and its signal output part conducting.
Switch element IC1 specifically can select relay, triode or metal-oxide-semiconductor.
When the magnitude of voltage of sampled signal does not exceed protection threshold values; comparator IC2 output low level; switch element IC1 turns off; second electric capacity C2 is charged by fault-signal output; second electric capacity C2 voltage is increased to high level gradually; now main control chip normally exports 6 road PWM drive singal by its signal output part, and brshless DC motor normally works.
When the magnitude of voltage of sampled signal has exceeded protection threshold values; comparator IC2 exports high level; switch element IC1 conducting; the electricity that second electric capacity C2 stores is discharged by the signal output part of switch element IC1; the voltage of fault-signal output FIB is reduced to low level rapidly, and main control chip turns off the output of its 6 road PWM drive singal.
The size of the second electric capacity C2 capacitance determines charging, the discharge time of electric capacity.The charge and discharge time can be controlled by the capacitance changing the 2nd C2, and then control the duration of main control chip shutoff, output drive signal.
Example is occured as with brshless DC motor short circuit duration, when the magnitude of voltage of the sampled signal of the size of current of reflection brshless DC motor is higher than protection threshold values, second electric capacity C2 discharges, voltage on second electric capacity C2 gradually becomes low level from high level, main control chip no longer exports PWM drive singal, and the electric current of brshless DC motor reduces rapidly; The magnitude of voltage of sampled signal is lower than protection threshold values thereupon; second electric capacity C2 starts charging; voltage on second electric capacity C2 is upgraded to high level gradually from low level; the voltage signal of fault-signal output FIB is elevated to high level; main control chip starts again to export PWM drive singal; brshless DC motor produces big current again, and this circuit is ceaselessly do action between protection occurs and protection stops.
If the first resistance R1 and the first electric capacity C1 filtering charging interval are T1, the response of comparator IC2, time of delay are T2, the ON time T3 of switch element IC1, turn-off time T4, T5 discharge time of the second electric capacity C2, charging interval T6, wherein, the power model that the temporal summation of T1, T2, T3 and T5 must be less than master control set can bear the time of the big current that short circuit causes, and is dragged down by the level of fault-signal output FIB at this moment in scope; The temporal summation of T1, T2, T4 and T6 must meet the radiating requirements of power model, avoids power model to damage because temperature is too high when constantly heavy current impact is born in circulation.
As can be seen from technique scheme, present embodiments provide a kind of protective circuit of brshless DC motor, this protective circuit is applied to the control device of brushless dc, and control device comprises main control chip and protective circuit for driving brshless DC motor.Protective circuit comprise link together by preset structure sampled signal input RNF, the first resistance R1, the first electric capacity C1, the second electric capacity C2, comparator IC2 and switch element IC1.When the magnitude of voltage of sampled signal has exceeded protection threshold values; comparator IC2 exports high level; switch element IC1 conducting; the electricity that second electric capacity C2 stores is discharged by the signal output part of switch element IC1; the voltage of fault-signal output FIB is reduced to low level rapidly, and main control chip turns off the output of its 6 road PWM drive singal, namely stops driving brshless DC motor; brshless DC motor also just stopped the generation of big current, thus big current can be avoided to cause damage to control device.
When switch element selects metal-oxide-semiconductor, also need an external second resistance R2 as pull-up resistor on its control end, specifically as shown in Figure 2.
When for not at the main control chip of its fault-signal input termination power; protective circuit also needs to arrange the power supply circuits to fault-signal supplying power for input end; these power supply circuits comprise voltage input end POWER and the 3rd resistance R3; voltage input end POWER for receiving external power source is connected with fault-signal output FIB by the 3rd resistance R3, specifically as shown in Figure 3.
Embodiment two
The circuit diagram of the protective circuit of a kind of brshless DC motor that Fig. 4 provides for another embodiment of the application.
As shown in Figure 4, the present embodiment has set up bleeder circuit on the basis of a upper embodiment, this bleeder circuit is used for providing reference voltage to comparator, utilizes the benefit of bleeder circuit to be by adjusting the resistance of divider resistance and ratio can obtain required reference voltage easily.Bleeder circuit comprises branch pressure voltage input VREG, the 4th resistance R4 and the 5th resistance R4.
Branch pressure voltage input VREG is for receiving driving voltage, and it is connected with one end of the 4th resistance R4, and the other end of the 4th resistance R4 is connected with the reverse input end of comparator IC2, one end of the 5th resistance R5 respectively, the other end ground connection of the 5th resistance R5.
Can adjust by the reference voltage that exports of the reverse input end of subtend comparator IC2 easily by adjusting the resistance of the 4th resistance R4 and the 5th resistance R5 and ratio.
In addition, in order to filtering clutter, the present embodiment is also provided with the three electric capacity C3 directly in parallel with the 5th resistance R5.
Embodiment three
Present embodiments provide a kind of control device of brshless DC motor, this control device comprises main control chip and the protective circuit that provides of embodiment above.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a protective circuit for brshless DC motor, is applied to the control device of described brshless DC motor, it is characterized in that, comprising:
For receiving the sampled signal input of the current signal of described brshless DC motor;
The first resistance that one end is connected with described sampled signal input;
The first electric capacity that one end is connected with the other end of described first resistance, the other end ground connection of described first electric capacity;
The comparator that positive input is connected with the other end of described first resistance, the reverse input end of described comparator is for receiving reference voltage;
The switch element that control end is connected with the output of described comparator, described switching elements conductive when described control end receives high level signal;
For connecting the fault-signal output of the fault-signal input of the main control chip of described control device;
The second electric capacity that one end is connected with described fault-signal output, the other end ground connection of described second electric capacity;
The signal input part of described switch element is connected with described fault-signal output, signal output part ground connection.
2. protective circuit as claimed in claim 1, it is characterized in that, described switch element comprises relay or triode.
3. protective circuit as claimed in claim 1, it is characterized in that, described switch element is metal-oxide-semiconductor, also comprises:
The second resistance that one end is connected with described fault-signal output, the other end of described second resistance is connected with described control end.
4. the protective circuit as described in any one of claims 1 to 3, is characterized in that, also comprises the power supply circuits for powering to described fault-signal output.
5. protective circuit as claimed in claim 4, it is characterized in that, described power supply circuits comprise:
For receiving the voltage input end of driving voltage;
The 3rd resistance that one end is connected with described voltage input end, the other end of described 3rd resistance is connected with described fault-signal output.
6. protective circuit as claimed in claim 4, is characterized in that, also comprise the bleeder circuit for exporting described reference voltage to the reverse input end of described comparator.
7. protective circuit as claimed in claim 6, it is characterized in that, described bleeder circuit comprises:
For receiving the branch pressure voltage input of driving voltage;
The 4th resistance that one end is connected with described branch pressure voltage output, the other end of described 4th resistance is connected with the positive input of described comparator;
The 5th resistance that one end is connected with the other end of described 4th resistance, the other end ground connection of described 5th resistance.
8. protective circuit as claimed in claim 7, is characterized in that, also comprise:
3rd electric capacity of the other end ground connection of one end and described 4th resistance, the other end ground connection of described 3rd electric capacity.
9. a control device, comprising the main control chip for controlling brshless DC motor, it is characterized in that, also comprise:
That be connected with described main control chip, as described in any one of claim 1 ~ 8 protective circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520946016.1U CN205141642U (en) | 2015-11-24 | 2015-11-24 | Brushless DC motor's protection circuit and controlling means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520946016.1U CN205141642U (en) | 2015-11-24 | 2015-11-24 | Brushless DC motor's protection circuit and controlling means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205141642U true CN205141642U (en) | 2016-04-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520946016.1U Withdrawn - After Issue CN205141642U (en) | 2015-11-24 | 2015-11-24 | Brushless DC motor's protection circuit and controlling means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205141642U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262061A (en) * | 2015-11-24 | 2016-01-20 | 珠海格力节能环保制冷技术研究中心有限公司 | Protection circuit and control device of brushless DC motor |
-
2015
- 2015-11-24 CN CN201520946016.1U patent/CN205141642U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262061A (en) * | 2015-11-24 | 2016-01-20 | 珠海格力节能环保制冷技术研究中心有限公司 | Protection circuit and control device of brushless DC motor |
| WO2017088566A1 (en) * | 2015-11-24 | 2017-06-01 | 珠海格力电器股份有限公司 | Protection circuit and control device for brushless dc motor |
| CN105262061B (en) * | 2015-11-24 | 2018-09-07 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of the protection circuit and control device of brshless DC motor |
| US10411461B2 (en) | 2015-11-24 | 2019-09-10 | Gree Electric Appliances, Inc. Of Zhuhai | Protection circuit for brushless DC motor, and control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160406 Effective date of abandoning: 20180907 |