CN105846732B - A kind of control circuit - Google Patents
A kind of control circuit Download PDFInfo
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- CN105846732B CN105846732B CN201610363623.4A CN201610363623A CN105846732B CN 105846732 B CN105846732 B CN 105846732B CN 201610363623 A CN201610363623 A CN 201610363623A CN 105846732 B CN105846732 B CN 105846732B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
Abstract
The invention discloses a kind of control circuits, it is connect with the H bridge output driving circuits of brshless DC motor, control circuit includes processing unit and signal element, processing unit is connect respectively with signal element and the connection of H bridge output driving circuits, for controlling virtual value or current direction into electric current in brshless DC motor；Signal element includes Hall element, Hall amplifier, selector and analog-digital converter, and processing unit includes input signal detection module, hysteresis comparator, hall signal detection module and output module；Output module is connect with H bridge output driving circuits.The advantages of the present invention are：Circuit system is simplified, circuit area is reduced, the design and the power consumption of debugging difficulty and brshless DC motor in startup or commutation of control circuit is reduced, improves the working efficiency of the reliability and durability and brshless DC motor of control circuit；The case where avoiding excessive electric current or electric current commutation too fast damage brshless DC motor.
Description
Technical field
The present invention relates to control field, more particularly to a kind of control circuit.
Background technology
Brushless DC motor control circuit is that the D/A converter module output controlled by digital module and Hall plate output are believed
It number relatively determines positive-negative polarity by analog circuit, hall signal is generated by hysteresis comparator analog circuit, and pass through
Hysteresis comparator thresholding needs to adjust hall signal according to different applications, realizes the control to brshless DC motor, therefore, existing
The design of some brushless DC motor control circuits and debugging are complex, and reliability and durability are poor；Existing nothing simultaneously
The Starting mode and switching mode of brushless motor are mostly to directly initiate and directly switch, wherein the startup electricity directly initiated
Stream is 3-7 times of rated current of motor, therefore brshless DC motor will often consume excessive when directly initiating or directly switching
Power, the working efficiency so as to cause motor is low and causes energy waste；Again since the starting current directly initiated is motor
3-7 times of rated current, therefore brshless DC motor is usually associated on startup since electric current is excessive or current direction mutation,
And the risk for causing brshless DC motor to damage.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of control circuit.The technical program realizes following technique effect：
1) selector is accessed while by the way that minimum speed is set end and Hall amplifier, and by using digital sluggish
Comparator, realization are multiplexed analog-digital converter, adaptively adjust hysteretic threshold, to simplify circuit system, reduce electricity
Road surface is accumulated, and is reduced the design and debugging difficulty of control circuit, is improved the reliability and durability of control circuit；
2) by using soft-start module and soft switching module, the working efficiency of brshless DC motor, energy drop are improved
Low power consumption of the brshless DC motor in startup or commutation, saves the energy；It also avoids simultaneously in startup or commutation, by
In electric current is excessive or electric current commutation is too fast damage brshless DC motor the case where.
A kind of control circuit in the present invention is connect with the H bridge output driving circuits of brshless DC motor, for controlling
State rotating speed or the torque of brshless DC motor, the control circuit includes processing unit and signal element, the processing unit with
The signal element connection, the processing unit is also connect with the H bridges output driving circuit, for controlling into described brushless
The virtual value or current direction of electric current in direct current generator；
The signal element includes Hall element, Hall amplifier, selector and analog-digital converter, the processing unit packet
Include input signal detection module, hysteresis comparator, hall signal detection module and output module；The Hall element is for exporting
Hall signal, the Hall element are connect with the input terminal of the Hall amplifier, the output end of the Hall amplifier and institute
The input terminal connection of selector is stated, the output end of the selector is connect with the input terminal of the analog-digital converter, the modulus
The output end of converter is connect with the input terminal of the input signal detection module, the output end of the input signal detection module
It is connect with the input terminal of the hysteresis comparator, the output end of the hysteresis comparator is defeated with the hall signal detection module
Enter end connection；The output module is connect with the H bridges output driving circuit；
The hall signal forms Hall digital signal, the Hall digital through the Hall amplifier and analog-digital converter
Signal enters the hysteresis comparator through the input signal detection module, and the hysteresis comparator is believed according to the Hall digital
Number export positive voltage or negative voltage to the hall signal detection module.
In said program, the signal element includes pulse-width signal end, minimum speed setting end and buffer；It is described
Pulse-width signal end is for receiving pulse-width signal, and the minimum speed setting end is for receiving minimum speed setting letter
Number；The buffer is connect with the pulse-width signal end, for receiving the pulse-width signal and being sent to the place
Manage unit；Minimum speed setting end is connect with the selector input terminal, and the minimum speed setting signal is through the choosing
It selects device and enters the analog-digital converter, the minimum speed setting signal is converted into minimum speed digital signal, the modulus
The minimum speed digital signal is sent to the input signal detection module by converter.
In said program, the processing unit further includes pulsewidth modulation detection module and soft-start module, the pulsewidth tune
Detection module processed is connect with the buffer, for receiving the pulse-width signal；The soft-start module respectively with it is described
Input signal detection module and connection, for receiving the pulse-width signal and minimum speed digital signal, and to the arteries and veins
Wide modulated signal and minimum speed digital signal are compared, and select in the pulse-width signal and minimum speed digital signal
The bigger signal of duty is as target duty ratio；The soft-start module is also exported by the output module and the H bridges
Driving circuit connects, to control the virtual value for entering electric current in the brshless DC motor.
In said program, the soft-start module steps up the duty ratio of the pulse-width signal, until the arteries and veins
The duty ratio of wide modulated signal is with the target duty than consistent；The output module controls institute according to the pulse-width signal
The time being switched on or off for stating each metal-oxide-semiconductor in H bridge output driving circuits enters electric current in the brshless DC motor with control
Virtual value.
In said program, it further includes dutyfactor value module to state processing unit, and the output module is set with rotating speed of target simultaneously
It is connect with the input signal detection module；The dutyfactor value module leads to the result of calculation of the duty ratio of pulse-width signal
The soft-start module is crossed to send to the output module；The output module is according to the calculating of the pulse-width signal duty ratio
As a result the rotating speed of target of the motor is obtained, the output module obtains the reality of the motor also according to the Hall digital signal
When rotating speed, and the rotating speed of target is compared with the real-time rotating speed；
When the rotating speed of target is more than the real-time rotating speed, the output module is by improving the pulse-width signal
Duty ratio, improve enter the brshless DC motor in electric current virtual value, to improve the real-time of the brshless DC motor
Rotating speed；When the rotating speed of target is less than the real-time rotating speed, the output module is by reducing the pulse-width signal
Duty ratio is lowered into the virtual value of electric current in the brshless DC motor, to reduce turning in real time for the brshless DC motor
Speed.
In said program, the hysteresis comparator is provided with hysteresis and lower hysteresis, and the hysteresis comparator will connect
The Hall digital signal received is compared with the upper hysteresis and lower hysteresis respectively；
When the Hall digital signal is more than the upper hysteresis, the hysteresis comparator is detected to the hall signal
Module exports positive voltage, and when the Hall digital signal is less than the lower hysteresis, the hysteresis comparator is believed to the Hall
Number detection module exports negative voltage.
In said program, the processing unit further includes soft switching module, the hall signal detection module respectively with institute
It states soft switching module to connect with Hall amplifier, the nominal torque period is set in the hall signal detection module；It is described suddenly
The positive voltage or negative voltage transition that your signal detection module receives are calculated at Hall square wave, and according to the Hall square wave
The real-time torque cycle of the brshless DC motor；
When the real-time torque cycle is less than the nominal torque period, the hall signal detection module trims described
Hall square wave simultaneously exports, to increase soft switching time；When the real-time torque cycle is equal to or more than the nominal torque period
When, the hall signal detection module stopping trims the Hall square wave and exports.
In said program, the hall signal detection module passes sequentially through the soft switching module and output module to described
H bridge output driving circuits export the Hall square wave, for being controlled in the H bridges output driving circuit according to the Hall square wave
Each metal-oxide-semiconductor is switched on or off, to control the current direction for entering electric current in the brshless DC motor.
In said program, the input terminal of the selector includes first input end and the second input terminal, first input
End is connect with the output end of the Hall amplifier, and second input terminal is connect with minimum speed setting end；It is described most
Small rotating speed sets end by minimum speed setting signal successively through the selector, the analog-to-digital conversion module, the input signal
Detection module and the hysteresis comparator are sent to the hall signal detection module.
The advantages of the present invention are：The present invention provides a kind of control circuit, simplifies circuit system, reduces
Circuit area, reduces the design and debugging difficulty of control circuit, improves the reliability and durability of control circuit；It improves
The working efficiency of brshless DC motor, the energy reduce power consumption of the brshless DC motor in startup or commutation, save energy
Source；It also avoids simultaneously in startup or commutation, it is too fast since electric current is excessive or electric current commutates and damage brshless DC motor
Situation.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structural schematic block diagram of control circuit of the present invention.
In figure：1, processing unit 2, signal element 3, brshless DC motor
11, input signal detection module 12, hysteresis comparator 13, hall signal detection module
14, pulsewidth modulation detection module 15, soft-start module 16, soft switching module
17, dutyfactor value module 18, output module
21, Hall element 22, Hall amplifier 23, selector
24, analog-digital converter 25, minimum speed setting end 26, pulse-width signal end
27, buffer 31, H bridge output driving circuits
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is further described.Following embodiment is only
For clearly illustrating technical scheme of the present invention, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, the present invention is a kind of control circuit, connect with the H bridges output driving circuit 31 of brshless DC motor 3
It connects, the rotating speed for controlling brshless DC motor 3 or torque, control circuit includes processing unit 1 and signal element 2, and processing is single
Member 1 is connect with signal element 2, and processing unit 1 is also connect with H bridges output driving circuit 31, enters brushless dc for controlling
The virtual value or current direction of electric current in machine 3；
Signal element 2 includes Hall element 21, Hall amplifier 22, selector 23 and analog-digital converter 24, processing unit 1
Including input signal detection module 11, hysteresis comparator 12, hall signal detection module 13 and output module 18；Hall element 21
For exporting hall signal, Hall element 21 is connect with the input terminal of Hall amplifier 22, the output end of Hall amplifier 22 with
The input terminal of selector 23 connects, and the output end of selector 23 is connect with the input terminal of analog-digital converter 24, analog-digital converter 24
Output end connect with the input terminal of input signal detection module 11, the output end of input signal detection module 11 is compared with sluggish
The input terminal of device 12 connects, and the output end of hysteresis comparator 12 is connect with the input terminal of hall signal detection module 13；Export mould
Block 18 is connect with H bridges output driving circuit 31；
Hall signal forms Hall digital signal through Hall amplifier 22 and analog-digital converter 24, and Hall digital signal is through defeated
Enter signal detection module 11 and enter hysteresis comparator 12, hysteresis comparator 12 detects mould according to Hall digital signal to hall signal
Block 13 exports positive voltage or negative voltage.
Preferably, signal element 2 includes pulse-width signal end 26, minimum speed setting end 25 and buffer 27；Pulsewidth
Modulated signal end 26 is for receiving pulse-width signal, and minimum speed setting end 25 is for receiving minimum speed setting signal；It is slow
Storage 27 is connect with pulse-width signal end 26, for receiving pulse-width signal and being sent to processing unit 1；Minimum speed is set
Fixed end 25 is connect with 23 input terminal of selector, and the chosen device 23 of minimum speed setting signal enters analog-digital converter 24, will be minimum
Rotary speed setting signal is converted into minimum speed digital signal, and minimum speed digital signal is sent to input letter by analog-digital converter 24
Number detection module 11.
Preferably, processing unit 1 further includes pulsewidth modulation detection module 14 and soft-start module 15, and pulsewidth modulation detects mould
Block 14 is connect with buffer 27, for receiving pulse-width signal；Soft-start module 15 respectively with input signal detection module 11
And connection, for receiving pulse-width signal and minimum speed digital signal, and to pulse-width signal and minimum speed number
Signal is compared, and selects the signal that duty is bigger in pulse-width signal and minimum speed digital signal as target duty
Than；Soft-start module 15 is also connect by output module 18 with H bridges output driving circuit 31, enters brshless DC motor to control
The virtual value of electric current in 3.
Preferably, soft-start module 15 steps up the duty ratio of pulse-width signal, until pulse-width signal accounts for
Sky is more consistent than with target duty ratio；Output module 18 controls each metal-oxide-semiconductor in H bridges output driving circuit 31 according to pulse-width signal
The time being switched on or off, with control enter brshless DC motor 3 in electric current virtual value.
Preferably, it further includes dutyfactor value module 17 to state processing unit 1, output module 18 be set with rotating speed of target and with it is defeated
Enter the connection of signal detection module 11；The result of calculation of the duty ratio of pulse-width signal is passed through soft start by dutyfactor value module 17
Module 15 is sent to output module 18；Output module 18 obtains the target of motor according to the result of calculation of pulse-width signal duty ratio
Rotating speed, output module 18 obtain the real-time rotating speed of motor also according to Hall digital signal, and by rotating speed of target and real-time rotating speed into
Row compares；
When rotating speed of target is more than real-time rotating speed, output module 18 is improved by the duty ratio of raising pulse-width signal
The virtual value of electric current in into brshless DC motor 3, to improve the real-time rotating speed of brshless DC motor 3；When rotating speed of target is less than
When real-time rotating speed, output module 18 is lowered into electric current in brshless DC motor 3 by the duty ratio of reduction pulse-width signal
Virtual value, to reduce the real-time rotating speed of brshless DC motor 3.
Preferably, hysteresis comparator 12 is provided with hysteresis and lower hysteresis, and hysteresis comparator 12 will receive suddenly
You compare with upper hysteresis and lower hysteresis digital signal respectively；
When Hall digital signal is more than upper hysteresis, hysteresis comparator 12 exports positive electricity to hall signal detection module 13
Pressure, when Hall digital signal is less than lower hysteresis, hysteresis comparator 12 exports negative voltage to hall signal detection module 13.
Preferably, processing unit 1 further includes soft switching module 16, hall signal detection module 13 respectively with soft switching module
16 and Hall amplifier 22 connect, be set with the nominal torque period in hall signal detection module 13；Hall signal detection module
13 positive voltages received or negative voltage transition calculate the real-time of brshless DC motor 3 at Hall square wave, and according to Hall square wave
Torque cycle；
When real-time torque cycle is less than the nominal torque period, hall signal detection module 13 trims Hall square wave and defeated
Go out, to increase soft switching time；When real-time torque cycle is equal to or more than the nominal torque period, hall signal detection module 13
Stopping trims Hall square wave and exports.
Preferably, hall signal detection module 13 passes sequentially through soft switching module 16 and output module 18 and exports drive to H bridges
Dynamic circuit 31 exports Hall square wave, for controlling the unlatching of each metal-oxide-semiconductor or pass in H bridges output driving circuit 31 according to Hall square wave
It is disconnected, to control the current direction for entering electric current in brshless DC motor 3.
Preferably, the input terminal of selector 23 includes first input end and the second input terminal, and first input end is put with Hall
The output end connection of big device 22, the second input terminal are connect with minimum speed setting end 25；Minimum speed sets end 25 and turns minimum
Fast setting signal chosen device 23, analog-to-digital conversion module, input signal detection module 11 and hysteresis comparator 12 successively, are sent to
Hall signal detection module 13.
Based on the above technical solution, brshless DC motor 3 is controlled using following methods：
1) 3 startups of brshless DC motor-soft start control method
Soft-start module 15 is operated, soft-start module 15 passes through to pulse-width signal and the progress of minimum speed digital signal
It compares, selects the larger signal in pulse-width signal and minimum speed digital signal as target duty ratio；Soft start mould
Block 15 also connect by output module 18 with H bridges output driving circuit 31, enters electric current in brshless DC motor 3 to control and has
Valid value；
Soft-start module 15 steps up the duty ratio of pulse-width signal, wherein the duty ratio of pulse-width signal exists
40% is increased linearly in 2ms, then increases by 1% per 20ms；After one circle of motor rotation, then with every 20ms increasing or decreasings
1%, keep the duty ratio of pulse-width signal close to target duty ratio, until the duty ratio of pulse-width signal is accounted for target
Sky is than consistent, completion soft start-up process.
2) electric current commutation-soft handover control method of brshless DC motor 3
Hall signal detection module 13 passes sequentially through dutyfactor value module 17, soft switching module 16 and output module 18 to H
Bridge output driving circuit 31 exports Hall square wave, for controlling each metal-oxide-semiconductor in H bridges output driving circuit 31 according to Hall square wave
It is switched on or off, to control the current direction for entering electric current in brshless DC motor 3；
Hysteresis comparator 12 is provided with hysteresis and lower hysteresis, and hysteresis comparator 12 believes the Hall digital received
It number is compared respectively with upper hysteresis and lower hysteresis, and exports positive voltage or negative voltage；Hall signal detection module 13 will receive
The positive voltage or negative voltage transition arrived is at Hall square wave；
Dutyfactor value module 17 receives pulse-width signal input and calculates its duty ratio；16 soft switching module of soft switching module
1616, it is connect with hall signal detection module 1313.
The nominal torque period is set as 34ms, when being less than 34ms when real-time torque cycle is less than the nominal torque period, is counted
Mode converter trims the Hall square wave exported to hall signal detection module 13, to increase soft switching time, and obtains
25% soft switching time；When real-time torque cycle is equal to or more than 34ms, digital analog converter stops detecting hall signal
What the Hall square wave that module 13 exports carried out trims, wherein the soft switching time of the raising and lowering of Hall square wave is fixed as
2.6ms, centre may have longer no driving time.
3) the constant rotational speed method of brshless DC motor 3
For completing the motor after starting, pulsewidth modulation detection module 14 is by soft-start module 15, according to target duty
Than to 18 output pulse width modulated signal of output module, output module 18 controls H bridge output driving circuits according to pulse-width signal
The time of each metal-oxide-semiconductor being switched on or off in 31, to control the virtual value for entering electric current in brshless DC motor 3；
Rotating speed of target is set in output module 18, the result of calculation of duty ratio is sent to soft open by dutyfactor value module 17
Dynamic model block 15；Output module 18 obtains the real-time rotating speed of motor by calculating duty ratio, and by rotating speed of target and real-time rotating speed into
Row compares；
When rotating speed of target is more than real-time rotating speed, output module 18 is improved by the duty ratio of raising pulse-width signal
The virtual value of electric current in into brshless DC motor 3, to improve the real-time rotating speed of brshless DC motor 3；When rotating speed of target is less than
When real-time rotating speed, output module 18 is lowered into electric current in brshless DC motor 3 by the duty ratio of reduction pulse-width signal
Virtual value, to reduce the real-time rotating speed of brshless DC motor 3.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (8)
1. a kind of control circuit is connect with the H bridge output driving circuits of brshless DC motor, for controlling the brushless dc
The rotating speed of machine or torque, which is characterized in that the control circuit includes processing unit and signal element, the processing unit and institute
Signal element connection is stated, the processing unit is also connect with the H bridges output driving circuit, for controlling into described brushless straight
The virtual value or current direction of electric current in galvanic electricity machine；
The signal element includes Hall element, Hall amplifier, selector and analog-digital converter, and the processing unit includes defeated
Enter signal detection module, hysteresis comparator, hall signal detection module and output module；The Hall element is for exporting Hall
Signal, the Hall element are connect with the input terminal of the Hall amplifier, output end and the choosing of the Hall amplifier
The input terminal connection of device is selected, the output end of the selector is connect with the input terminal of the analog-digital converter, the analog-to-digital conversion
The output end of device is connect with the input terminal of the input signal detection module, the output end of the input signal detection module and institute
State the input terminal connection of hysteresis comparator, the input terminal of the output end of the hysteresis comparator and the hall signal detection module
Connection；The output module is connect with the H bridges output driving circuit；
The hall signal forms Hall digital signal, the Hall digital signal through the Hall amplifier and analog-digital converter
Through the input signal detection module enter the hysteresis comparator, the hysteresis comparator according to the Hall digital signal to
The hall signal detection module output positive voltage or negative voltage；
The signal element includes pulse-width signal end, minimum speed setting end and buffer；The pulse-width signal end
For receiving pulse-width signal, the minimum speed setting end is for receiving minimum speed setting signal；The buffer with
The pulse-width signal end connection, for receiving the pulse-width signal and being sent to the processing unit；The minimum
Rotating speed setting end is connect with the selector input terminal, and the minimum speed setting signal enters the modulus through the selector
The minimum speed setting signal is converted into minimum speed digital signal by converter, and the analog-digital converter is by the minimum
Rotating speed digital signal is sent to the input signal detection module.
2. a kind of control circuit according to claim 1, which is characterized in that the processing unit further includes pulsewidth modulation inspection
Module and soft-start module are surveyed, the pulsewidth modulation detection module is connect with the buffer, for receiving the pulsewidth modulation
Signal；The soft-start module respectively with the input signal detection module and connect, for receiving the pulse-width signal
With minimum speed digital signal, and the pulse-width signal and minimum speed digital signal are compared, select the arteries and veins
The bigger signal of duty is as target duty ratio in wide modulated signal and minimum speed digital signal；The soft-start module is also
It is connect with the H bridges output driving circuit by the output module, enters electric current in the brshless DC motor to control
Virtual value.
3. a kind of control circuit according to claim 2, which is characterized in that the soft-start module steps up the arteries and veins
The duty ratio of wide modulated signal, until the duty ratio of the pulse-width signal is consistent with target duty ratio；The output
Module controls the time of each metal-oxide-semiconductor in the H bridges output driving circuit being switched on or off according to the pulse-width signal, with
Control enters the virtual value of electric current in the brshless DC motor.
4. a kind of control circuit according to claim 3, which is characterized in that it further includes dutyfactor value mould to state processing unit
Block, the output module are set with rotating speed of target and are connect with the input signal detection module；The dutyfactor value module will
The result of calculation of the duty ratio of pulse-width signal is sent by the soft-start module to the output module；The output module
Obtain the rotating speed of target of the motor according to the result of calculation of the pulse-width signal duty ratio, the output module also according to
The Hall digital signal obtains the real-time rotating speed of the motor, and the rotating speed of target and the real-time rotating speed are compared
It is right；
When the rotating speed of target is more than the real-time rotating speed, the output module is by improving accounting for for the pulse-width signal
Empty ratio improves the virtual value for entering electric current in the brshless DC motor, to improve the real-time rotating speed of the brshless DC motor；
When the rotating speed of target is less than the real-time rotating speed, the output module passes through the duty for reducing the pulse-width signal
Than the virtual value of electric current in the brshless DC motor being lowered into, to reduce the real-time rotating speed of the brshless DC motor.
5. a kind of control circuit according to claim 1, which is characterized in that the hysteresis comparator is provided with hysteresis
With lower hysteresis, the hysteresis comparator by the Hall digital signal received respectively with the upper hysteresis and lower sluggishness
Value compares；
When the Hall digital signal is more than the upper hysteresis, the hysteresis comparator is to the hall signal detection module
Positive voltage is exported, when the Hall digital signal is less than the lower hysteresis, the hysteresis comparator is examined to the hall signal
It surveys module and exports negative voltage.
6. a kind of control circuit according to claim 4, which is characterized in that the processing unit further includes soft handover mould
Block, the hall signal detection module are connect with the soft switching module and Hall amplifier respectively, the hall signal detection
The nominal torque period is set in module；The positive voltage that the hall signal detection module receives or negative voltage transition at
Hall square wave, and calculate according to the Hall square wave the real-time torque cycle of the brshless DC motor；
When the real-time torque cycle is less than the nominal torque period, the hall signal detection module trims the Hall
Square wave simultaneously exports, to increase soft switching time；When the real-time torque cycle is equal to or more than the nominal torque period, institute
The stopping of hall signal detection module is stated to trim the Hall square wave and export.
7. a kind of control circuit according to claim 6, which is characterized in that the hall signal detection module passes sequentially through
The soft switching module and output module export the Hall square wave to the H bridges output driving circuit, are used for according to suddenly
Your square wave controls being switched on or off for each metal-oxide-semiconductor in the H bridges output driving circuit, enters the brshless DC motor with control
The current direction of interior electric current.
8. a kind of control circuit according to claim 1, which is characterized in that the input terminal of the selector includes first defeated
Enter end and the second input terminal, the first input end connect with the output end of the Hall amplifier, second input terminal and
Minimum speed setting end connection；Minimum speed setting end by minimum speed setting signal successively through the selector,
The analog-to-digital conversion module, the input signal detection module and the hysteresis comparator are sent to the hall signal detection
Module.
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| CN116937503A (en) * | 2023-07-20 | 2023-10-24 | 青岛科凯电子研究所股份有限公司 | Motor rotation speed control device |
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| CN1705220A (en) * | 2004-06-03 | 2005-12-07 | 旺玖科技股份有限公司 | Low-noise DC motor drive chip |
| CN201887710U (en) * | 2010-08-06 | 2011-06-29 | 刘二林 | Two-phase speed adjustable brushless DC motor |
| CN205792320U (en) * | 2016-05-27 | 2016-12-07 | 上海路虹电子科技有限公司 | A kind of brushless DC motor control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100732717B1 (en) * | 2005-12-29 | 2007-06-27 | 삼성전자주식회사 | Motor system and control method thereof, and compressor using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1705220A (en) * | 2004-06-03 | 2005-12-07 | 旺玖科技股份有限公司 | Low-noise DC motor drive chip |
| CN201887710U (en) * | 2010-08-06 | 2011-06-29 | 刘二林 | Two-phase speed adjustable brushless DC motor |
| CN205792320U (en) * | 2016-05-27 | 2016-12-07 | 上海路虹电子科技有限公司 | A kind of brushless DC motor control circuit |
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