CN205901646U - Miniwatt drag cup direct current motor control circuit - Google Patents
Miniwatt drag cup direct current motor control circuit Download PDFInfo
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- CN205901646U CN205901646U CN201620898473.2U CN201620898473U CN205901646U CN 205901646 U CN205901646 U CN 205901646U CN 201620898473 U CN201620898473 U CN 201620898473U CN 205901646 U CN205901646 U CN 205901646U
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- nmos pipe
- motor
- door
- grid
- control circuit
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Abstract
The utility model discloses a miniwatt drag cup direct current motor control circuit, including control module, full -bridge drive module and current detection module, current detection module includes sampling resistor rs and high accuracy differential amplifier U306, and the electric current that the motor was exported to the full -bridge drive module turns into voltage waveform and delivers to high accuracy differential amplifier U306 through sampling resistor rs, and the voltage waveform who enlargies output through high accuracy differential amplifier U306 delivers to control module. The utility model discloses a high accuracy differential amplifier can reflect the motor current signal through enlargeing the voltage waveform who exports the back perfectly, and the degree of accuracy that has effectively improved current detection is fit for being used for the motor to this kind of undercurrent of drag cup direct current motor to carry out current detection.
Description
Technical field
The utility model is related to circuit for controlling motor, more particularly to small-power hollow cup DC motor control circuit.
Background technology
Motor is seen everywhere in our daily lifes, and with the continuous development of machine field, the performance of motor is increasingly
Good, volume is done less and less, conversion efficiency more and more higher, and wherein hollow cup DC motor is exactly typical representative.Drag cup direct current
Motor volume is little, has prominent energy conservation characteristic, sensitive convenient control characteristic and stable operation characteristic, as efficient
Energy conversion device, represents the developing direction of motor.However, hollow cup DC motor control circuit of the prior art is often
Using hall device as current detection module core, and the broad quantum of hall device, sensitivity is low, precision is not high,
Relatively it is suitable for larger current is detected, be not suitable for the electric current of this kind of low-power machine of hollow cup DC motor is examined
Survey.In actual use it has also been found that when temperature change is larger, the zero point value drift of hall device is big, small current already by
Drift is flooded, and leads to electric current loop to adjust disorderly, motor vibrating is seriously it is impossible to realize the accurate detection of electric current.
Utility model content
Utility model purpose: the purpose of this utility model is that offer is a kind of can solve the problem that defect present in prior art
Small-power hollow cup DC motor control circuit.
Technical scheme: small-power hollow cup DC motor control circuit described in the utility model, including control module, entirely
Bridge drive module and current detection module；Current detection module includes sampling resistor rs and high accuracy differential amplifier u306, entirely
The electric current that bridge drive module exports motor is converted into voltage waveform through sampling resistor rs and delivers to high accuracy differential amplifier
U306, the voltage waveform amplifying output through high accuracy differential amplifier u306 delivers to control module.
Further, it is additionally provided with resistance-capacitance type wave filter between described sampling resistor rs and high accuracy differential amplifier u306.
Further, it is additionally provided with resistance-capacitance type filtering between described high accuracy differential amplifier u306 output end and control module
Device.
Further, generate heat to solve the problems, such as hollow cup DC motor, described full-bridge drive module includes four nmos
Pipe, the source electrode of a nmos pipe q1 and the source electrode of the 3rd nmos pipe q3 are all connected with one end of motor, the source electrode of the 2nd nmos pipe q2
It is all connected with the other end of motor with the source electrode of the 4th nmos pipe q4, the grid input signal of four nmos pipes is carried by control module
For: wherein, between the grid waveform input signal of a nmos pipe q1 and the grid waveform input signal of the 3rd nmos pipe q3 mutually
Mend, also complementary between the grid waveform input signal of the 2nd nmos pipe q2 and the grid waveform input signal of the 4th nmos pipe q4.
Further, in order to not increase the quantity of controller, reduces cost, described control module include a controller mcu,
One digital logic chip u307 and two half-bridge driven chips, digital logic chip u307 has two or more and door, controls
Device mcu exports two paths of signals, and wherein, first via signal delivers to an input of first and door, and second road signal delivers to second
With an input of door, first is connected controller with another input of door and second respectively with another input of door
Mcu, first is connected two inputs of the first half-bridge driven chip u301, the first half-bridge driven chip u301 with the output end of door
An output end output signal as a nmos pipe q1 grid input signal, the first half-bridge driven chip u301 another
As the grid input signal of the 3rd nmos pipe q3, second is connected the second half to the output signal of one output end with the output end of door
Two inputs of bridge driving chip u302, the output signal of an output end of the second half-bridge driven chip u302 is as second
The grid input signal of nmos pipe q2, the output signal of another output end of the second half-bridge driven chip u302 is as the 4th
The grid input signal of nmos pipe q4.
Further, in order to ensure during upper electricity and power down and when electromagnetic environment is poor motor will not tamper work, institute
State first and pass through a resistance eutral grounding with another input of door, second passes through another resistance with another input of door
Ground connection.
Further, also include detecting feedback module, the rotating speed of detection feedback module detection motor or position and will detect
Result delivers to control module；Described detection feedback module includes the four-way buffering conversion gate being capable of level conversion.
Beneficial effect: the utility model adopts high accuracy differential amplifier, after amplifying, the voltage waveform of output can
Ideally reflect motor current signal, effectively increase the degree of accuracy of current detecting, be suitable for hollow cup DC motor
The motor of this small current carries out current detecting.
Brief description
Fig. 1 is the general diagram of the utility model specific embodiment；
Fig. 2 is the circuit diagram of the full-bridge drive module of the utility model specific embodiment；
Fig. 3 is the circuit diagram of the control module of the utility model specific embodiment；
Fig. 4 is the circuit diagram of the current detection module of the utility model specific embodiment；
Fig. 5 is the circuit diagram of the detection feedback module of the utility model specific embodiment.
Specific embodiment
With reference to the accompanying drawings and detailed description the technical solution of the utility model is further introduced.
As shown in figure 1, the utility model discloses a kind of small-power hollow cup DC motor control circuit, including controlling mould
Block, full-bridge drive module, current detection module and detection feedback module；Control module produces the grid input of full-bridge drive module
Signal, full-bridge drive module motor operates, and current detection module detects that full-bridge drive module exports the electric current of motor simultaneously
Testing result is delivered to control module, the rotating speed of detection feedback module detection motor or position and testing result is delivered to control
Module.
Wherein, full-bridge drive module includes four nmos pipes, as shown in Fig. 2 the source electrode and the 3rd of a nmos pipe q1
The source electrode of nmos pipe q3 is all connected with one end of motor, and the source electrode of the 2nd nmos pipe q2 and the source electrode of the 4th nmos pipe q4 are all connected with electricity
The other end of machine, the grid input signal of four nmos pipes is provided by control module: wherein, the grid of a nmos pipe q1 is defeated
Enter complementary between signal waveform and the grid waveform input signal of the 3rd nmos pipe q3, the grid input signal of the 2nd nmos pipe q2
Also complementary between the grid waveform input signal of waveform and the 4th nmos pipe q4.In this specific embodiment, when motor rotates forward, the
The grid input signal of the grid input signal of one nmos pipe q1 and the 3rd nmos pipe q3 is the pwm signal that dutycycle is less than 1,
The grid input signal of the 2nd nmos pipe q2 is low level, and the grid input signal of the 4th nmos pipe q4 is high level；Motor is anti-
When turning, the grid input signal of a nmos pipe q1 is low level, and the grid input signal of the 3rd nmos pipe q3 is high level, the
The grid input signal of the grid input signal of two nmos pipe q2 and the 4th nmos pipe q4 is the pwm signal that dutycycle is less than 1.
So can rotating speed according to required for the motor size to arrange dutycycle, thus solving serious heating during electrode drive
Problem.
Control module is as shown in figure 3, include controller mcu, a digital logic chip u307 and two half-bridges drives
Dynamic chip, wherein, model 74hct08 of digital logic chip u307, the model of two half-bridge driven chips is
irs2183spbf.Digital logic chip u307 has two or more and door, and controller mcu exports two paths of signals, wherein, first
Road signal delivers to an input of first and door, and first is grounded by resistance r341 with another input of door, the second tunnel
Signal delivers to an input of second and door, and second is grounded by resistance r342 with another input of door, and first and door
Another input and second be also respectively connected with controller mcu with another input of door, and first with door another
Input and second all inputs enable signal with another input of door, and first is connected the first half-bridge driven with the output end of door
Two inputs of chip u301, the output signal of an output end of the first half-bridge driven chip u301 is managed as a nmos
The grid input signal of q1, the output signal of another output end of the first half-bridge driven chip u301 is as the 3rd nmos pipe q3
Grid input signal, second is connected two inputs of the second half-bridge driven chip u302, the second half-bridge with the output end of door
The output signal of one output end of driving chip u302 is as the grid input signal of the 2nd nmos pipe q2, the second half-bridge driven
The output signal of another output end of chip u302 is as the grid input signal of the 4th nmos pipe q4.
Why adopt the half-bridge driven chip of model irs2183spbf, be because this anti-phase electricity of built-in chip type high speed
Road and dead-zone circuit, are prevented from half-bridge upper and lower two nmos pipes conducting, the pwm waveform of the complementation with dead band for the output, in addition it
Also there is waveform filter function.
Innovatively add enable control in control module, each motor individually can be enabled or disable, when needing to lock
Determine when motor it is only necessary to controller mcu export low level signal to first with another input of door and second and door
Another input, then through the two ends of full-bridge drive module rear motor be entirely ground connection, any action will not be produced.This
Outward, the setting of resistance r341 and r342 is so that when controller mcu exports or output state is unstable, and first and door
Another input and second be entirely ground connection with another input of door, any action will not be produced, so can
Guarantee that during upper electricity and power down and when electromagnetic environment is poor, motor will not tamper work.
Current detection module is as shown in figure 4, include sampling resistor rs, the first resistance-capacitance type wave filter, in high precision differential amplification
Device u306 and the second resistance-capacitance type wave filter, the electric current that full-bridge drive module exports motor is converted into voltage through sampling resistor rs
Waveform, voltage waveform delivers to high accuracy differential amplifier u306 after the filtering of the first resistance-capacitance type wave filter, through high accuracy
The voltage waveform that differential amplifier u306 amplifies output delivers to the second resistance-capacitance type wave filter, through the filter of the second resistance-capacitance type wave filter
Control module is delivered to after ripple.Physical circuit is: one end of motor connects one end of sampling resistor rs, the other end of sampling resistor rs
Connect one end of power supply vcc and resistance r320, the other end of sampling resistor rs connects one end of resistance r321, and resistance r321's is another
One end connects one end of electric capacity c322, and the other end of electric capacity c322 connects the other end of resistance r320, and one end of electric capacity c322 is even
Meet the positive input terminal in+ of high accuracy differential amplifier u306, the other end of electric capacity c322 connects high accuracy differential amplifier u306
Negative input end in, output end out of high accuracy differential amplifier u306 connects one end of electric capacity c331, and electric capacity c331's is another
One end connects one end of resistance r337, and the other end of resistance r337 connects one end of resistance r338, and one end of resistance r338 connects
One end of electric capacity c333, the other end of the other end of electric capacity c331, the other end of resistance r338 and electric capacity c333 is all grounded.Its
In, resistance r320, resistance r321 and electric capacity c322 constitute the first resistance-capacitance type wave filter, resistance r337, electric capacity c331, resistance r338
Constitute the second resistance-capacitance type wave filter with electric capacity c333.
Because the power supply that controller mcu uses is 3.3v, and the power supply of the encoder of motor is often 5v, so encoder
The type feeding back cannot directly be made a gift to someone and be detected in controller mcu, and relatively common way is by transistor collector
The mode of pull-up, is converted into 3.3v signal 5v signal, if the distinct disadvantage of such way is number of motors is multiple, needs
Want the device that multichannel is discrete, circuit complexity is loaded down with trivial details, and fault rate is very high, and encoder exports to have during interference and can reflect detection
End.So, the utility model proposes a kind of highly integrated detection feedback module with high reliability and disturbance filter function,
As shown in figure 5, including the four-way buffering conversion gate u109 being capable of level conversion, four-way buffers conversion gate
Model sn74lv4t125 of u109, it has bi-directional conversion function, also has necessarily sluggish filter function, is a high speed
Electrical level conversion chip, is highly suitable for encoder circuit.
Claims (7)
1. small-power hollow cup DC motor control circuit it is characterised in that: include control module, full-bridge drive module and electric current
Detection module；Current detection module includes sampling resistor rs and high accuracy differential amplifier u306, and full-bridge drive module exports
The electric current of motor is converted into voltage waveform through sampling resistor rs and delivers to high accuracy differential amplifier u306, poor through high accuracy
The voltage waveform that dynamic amplifier u306 amplifies output delivers to control module.
2. small-power hollow cup DC motor control circuit according to claim 1 it is characterised in that: described sampling resistor
It is additionally provided with resistance-capacitance type wave filter between rs and high accuracy differential amplifier u306.
3. small-power hollow cup DC motor control circuit according to claim 1 it is characterised in that: described high accuracy is poor
It is additionally provided with resistance-capacitance type wave filter between dynamic amplifier u306 output end and control module.
4. small-power hollow cup DC motor control circuit according to claim 1 it is characterised in that: described full-bridge drives
Module includes four nmos pipe, and the source electrode of a nmos pipe q1 and the source electrode of the 3rd nmos pipe q3 are all connected with one end of motor, the
The source electrode of the source electrode of two nmos pipe q2 and the 4th nmos pipe q4 is all connected with the other end of motor, the grid input letter of four nmos pipes
Number by control module provide: wherein, the grid waveform input signal of a nmos pipe q1 is defeated with the grid of the 3rd nmos pipe q3
Enter complementation, the grid waveform input signal of the 2nd nmos pipe q2 and the grid input signal of the 4th nmos pipe q4 between signal waveform
Also complementary between waveform.
5. small-power hollow cup DC motor control circuit according to claim 4 it is characterised in that: described control module
Including a controller mcu, a digital logic chip u307 and two half-bridge driven chips, digital logic chip u307 has
Two or more and door, controller mcu exports two paths of signals, and wherein, first via signal delivers to an input of first and door, the
Two road signals deliver to an input of second and door, first with another input of door and second with another input of door
End connects controller mcu respectively, and first is connected two inputs of the first half-bridge driven chip u301 with the output end of door, and first
The output signal of one output end of half-bridge driven chip u301 is as the grid input signal of a nmos pipe q1, the first half-bridge
The output signal of another output end of driving chip u301 as the grid input signal of the 3rd nmos pipe q3, second with door
Output end connects two inputs of the second half-bridge driven chip u302, an output end of the second half-bridge driven chip u302
Output signal as the grid input signal of the 2nd nmos pipe q2, another output end of the second half-bridge driven chip u302 defeated
Go out signal as the grid input signal of the 4th nmos pipe q4.
6. small-power hollow cup DC motor control circuit according to claim 5 it is characterised in that: described first and door
Another input pass through a resistance eutral grounding, second passes through another resistance eutral grounding with another input of door.
7. small-power hollow cup DC motor control circuit according to claim 1 it is characterised in that: also include detection anti-
Testing result is simultaneously delivered to control module by feedback module, the rotating speed of detection feedback module detection motor or position；Described detection is anti-
Feedback module includes the four-way buffering conversion gate being capable of level conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620898473.2U CN205901646U (en) | 2016-08-17 | 2016-08-17 | Miniwatt drag cup direct current motor control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620898473.2U CN205901646U (en) | 2016-08-17 | 2016-08-17 | Miniwatt drag cup direct current motor control circuit |
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| Publication Number | Publication Date |
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| CN205901646U true CN205901646U (en) | 2017-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620898473.2U Active CN205901646U (en) | 2016-08-17 | 2016-08-17 | Miniwatt drag cup direct current motor control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768227A (en) * | 2018-06-27 | 2018-11-06 | 深圳市歌尔泰克科技有限公司 | Automatic coffee machine and its circuit for controlling motor |
| CN109861593A (en) * | 2018-12-28 | 2019-06-07 | 诺鑫（南通）医疗技术有限公司 | A kind of hollow-cup motor control method |
| CN109932669A (en) * | 2019-03-27 | 2019-06-25 | 三峡大学 | A kind of digit compensated AMR magnetic field measuring device |
| CN111342735A (en) * | 2018-12-19 | 2020-06-26 | 厦门市必易微电子技术有限公司 | Stepless speed regulating circuit and speed regulating method for single-phase motor |
-
2016
- 2016-08-17 CN CN201620898473.2U patent/CN205901646U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768227A (en) * | 2018-06-27 | 2018-11-06 | 深圳市歌尔泰克科技有限公司 | Automatic coffee machine and its circuit for controlling motor |
| WO2020001218A1 (en) * | 2018-06-27 | 2020-01-02 | 歌尔股份有限公司 | Automatic coffee machine and electric motor control circuit thereof |
| CN111342735A (en) * | 2018-12-19 | 2020-06-26 | 厦门市必易微电子技术有限公司 | Stepless speed regulating circuit and speed regulating method for single-phase motor |
| CN109861593A (en) * | 2018-12-28 | 2019-06-07 | 诺鑫（南通）医疗技术有限公司 | A kind of hollow-cup motor control method |
| CN109932669A (en) * | 2019-03-27 | 2019-06-25 | 三峡大学 | A kind of digit compensated AMR magnetic field measuring device |
| CN109932669B (en) * | 2019-03-27 | 2021-06-29 | 三峡大学 | Digital compensation type AMR magnetic field measuring device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |