CN109066594A - A kind of over-temperature protection device of motor, motor and its excess temperature protection method - Google Patents
A kind of over-temperature protection device of motor, motor and its excess temperature protection method Download PDFInfo
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- CN109066594A CN109066594A CN201810867073.9A CN201810867073A CN109066594A CN 109066594 A CN109066594 A CN 109066594A CN 201810867073 A CN201810867073 A CN 201810867073A CN 109066594 A CN109066594 A CN 109066594A
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- 230000033228 biological regulation Effects 0.000 claims abstract description 50
- 230000001012 protector Effects 0.000 claims abstract description 49
- 230000005611 electricity Effects 0.000 claims description 11
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- 238000010586 diagram Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
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- 230000002093 peripheral effect Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
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- Protection Of Generators And Motors (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of over-temperature protection device of motor, motor and its excess temperature protection method, which includes: thermistor, the Current Temperatures of the switching tube for incuding the motor；Divider resistance is arranged in series with the thermistor, is used to form the partial pressure branch to preset power supply, to realize that the partial pressure to the voltage regulation unit and the control switch controls；Voltage regulation unit; in the case where for reaching the default overheat protector point of the switching tube in the Current Temperatures; in off state; the controller that low level signal to the motor is exported to control the control switch conducting in conjunction with the partial pressure branch, so that the controller controls the motor stopping according to the low level signal.The solution of the present invention can solve and there is a problem of protection reliability difference by controlling the switch of triode in the prior art to carry out excess temperature stoppage protection, achievees the effect that promote protection reliability.
Description
Technical field
The invention belongs to temperature protection technical fields, and in particular to a kind of over-temperature protection device of motor, motor and its mistake
Warm guard method more particularly to a kind of high-precision thermal-shutdown circuit, with the motor of the thermal-shutdown circuit and the motor
Excess temperature protection method.
Background technique
Since brshless DC motor has the characteristics that high-efficient, detent torque is big, easy to control, application field is increasingly
Extensively.Brshless DC motor is mainly made of motor body and controller two parts.Controller part includes control chip, power drive
The circuits such as dynamic circuit, position detecting circuit, signal feedback；Wherein power driving circuit is usually by signal amplification circuit and full-bridge
(or half-bridge) inverter circuit forms, and the switching tube in inverter circuit can seriously generate heat during being switched on or off at a high speed, and one
Denier fever is more than the temperature tolerance range of switching tube, then will lead to switching tube and burn out, cause motor failure.
So needing to avoid causing DC brushless motor to fail since switching tube device temperature is excessively high in brushless direct-current
Electric machine controller increases thermal-shutdown circuit when designing, therefore carries out for switching tube in brushless direct current motor controller a kind of high
Precision thermal Protection Circuit Design.Existing thermal-shutdown circuit carries out excess temperature stoppage protection by controlling the switch of triode,
Since control triode switch voltage range is larger, generally 0.7V~1.0V can cause motor to occur accidentally protecting or protecting
Not in time.
Summary of the invention
It is an object of the present invention in view of the foregoing drawbacks, provide the over-temperature protection device, motor and its excess temperature of a kind of motor
Guard method, to solve in the prior art, by controlling the switch of triode, to carry out excess temperature stoppage protection, there are protection reliabilities
The problem of difference achievees the effect that promote protection reliability.
The present invention provides a kind of over-temperature protection device of motor, comprising: thermistor, divider resistance, voltage regulation unit, control
Switch and controller；Wherein, the thermistor, the Current Temperatures of the switching tube for incuding the motor；The partial pressure electricity
Resistance is arranged in series with the thermistor, is used to form the partial pressure branch to preset power supply, to realize to the pressure stabilizing
The control of the partial pressure of unit and the control switch；The voltage regulation unit, for reaching the switching tube in the Current Temperatures
It is in off state in the case where default overheat protector point, it is defeated to control the control switch conducting in conjunction with the partial pressure branch
Low level signal stops to the controller of the motor so that the controller controls the motor according to the low level signal out
Machine.
Optionally, the voltage regulation unit, the default excess temperature for being also used to be not up to the switching tube in the Current Temperatures are protected
It is on state in the case where shield point, exports high level letter to control the control switch shutdown in conjunction with the partial pressure branch
Number to the motor controller operated normally so that the controller controls the motor according to the high level signal.
Optionally, the thermistor is arranged in the pre-determined distance of the switching tube of the motor；And/or the partial pressure
The resistance value of resistance, can be according to the voltage value of the power supply, the thermistor under the default overheat protector point
Resistance value determination obtains.
Optionally, the voltage regulation unit, comprising: the three terminal regulator of model TL431；The benchmark of the three terminal regulator
End is connected to the common end of the thermistor Yu the divider resistance, and the cathode of the three terminal regulator is connected to the control
The control terminal of switch.
Optionally, wherein the thermistor, comprising: NTC thermistor or PTC thermistor；And/or the control
Switch, comprising: NPN triode or PNP triode.
Optionally, wherein if the voltage regulation unit includes the three terminal regulator of model TL431, the thermistor packet
Include NTC thermistor, the control switch includes NPN triode, then the base stage of the NPN triode is as the control switch
Control terminal, output end of the emitter of the NPN triode as the control switch be connected to the signal of the controller
Input terminal；If the voltage regulation unit include the three terminal regulator of model TL431, the thermistor include PTC thermistor,
The control switch includes PNP triode, then control terminal of the base stage of the PNP triode as the control switch, described
Output end of the collector of PNP triode as the control switch, is connected to the signal input part of the controller.
Optionally, further includes: at least one of the first shunt resistance, second shunt resistance；Wherein, it described first shunts
Resistance is arranged between the control terminal of the control switch and preset power supply, for the voltage regulation unit and described
Control switch is protected；And/or second shunt resistance, be arranged in the control switch output end and preset confession
Between power supply, for being protected to the voltage regulation unit and the control switch.
Match with above-mentioned apparatus, further aspect of the present invention provides a kind of motor, comprising: the excess temperature of above-described motor
Protective device.
Match with above-mentioned motor, another aspect of the present invention provides a kind of excess temperature protection method of motor, comprising: passes through heat
Quick resistance, the Current Temperatures of the switching tube for incuding the motor；It is arranged in series to be formed with thermistor by divider resistance
Partial pressure branch, preset power supply is divided, the partial pressure of voltage regulation unit and control switch is controlled with realizing；Pass through
Voltage regulation unit is in off state, with knot in the case where the Current Temperatures reach the default overheat protector point of the switching tube
It closes the partial pressure branch to control the control switch conducting and export low level signal, realizes and controlled according to the low level signal
The motor stopping.
Optionally, further includes: by voltage regulation unit, protected in the default excess temperature that the Current Temperatures are not up to the switching tube
It is on state in the case where shield point, exports high level letter to control the control switch shutdown in conjunction with the partial pressure branch
Number, realize that controlling the motor according to the high level signal operates normally.
Optionally, further includes: by the first shunt resistance, the voltage regulation unit and the control switch are protected；
And/or by the second shunt resistance, for being protected to the voltage regulation unit and the control switch.
The solution of the present invention can be solved effectively by increasing the protection circuit of switch tube temperature detection due to switch
The failure of direct current generator caused by pipe is burnt out, promotes protection reliability.
Further, the solution of the present invention accurately carries out protection shutdown by effective detection switch tube temperature degree, avoids switching
Pipe, which is burnt out, causes motor failure, improves the reliability of protection and the safety of motor work.
Further, the solution of the present invention accurately carries out protection shutdown by effective detection switch tube temperature degree, avoids switching
Pipe, which is burnt out, causes motor failure, can effectively reduce the fraction defective after sale of motor, improve brshless DC motor reliability and
Safety.
The solution of the present invention as a result, by using the effective detection switch tube temperature degree of adjustable three terminal regulator, and then carries out
Motor overheat protector solves the prior art, it can be achieved that brshless DC motor is accurately shut down when switching tube temperature reaches certain value
In by control triode switch come carry out excess temperature stoppage protection there is a problem of protection reliability difference, thus, overcome existing
Protection reliability is poor in technology, accidentally protective rate is high and protects the defect of timeliness difference, realizes that protection reliability is good, accidentally protective rate is low
The good beneficial effect with protection timeliness.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of an embodiment of the over-temperature protection device of motor of the invention；
Fig. 2 is the electronic schematic diagram of an embodiment of the over-temperature protection device of motor of the invention；
Fig. 3 is the flow diagram of an embodiment of the excess temperature protection method of motor of the invention.
In conjunction with attached drawing, appended drawing reference is as follows in the embodiment of the present invention:
102- thermistor；104- divider resistance；106- voltage regulation unit；108- control switch；110- controller.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
According to an embodiment of the invention, a kind of over-temperature protection device of motor is provided, the device of the invention as shown in Figure 1
An embodiment structural schematic diagram.The over-temperature protection device of the motor may include: thermistor 102 (such as NTC resistance, PTC
Resistance etc.), divider resistance 104 (such as divider resistance 104R1), voltage regulation unit 106, control switch 108 and controller 110.
In an optional example, the thermistor 102 can be used for incuding the current temperature of the switching tube of the motor
Degree.Such as: thermistor NTC is affected by temperature, resistance value change control adjustable three terminal regulator (such as TL431, one
Kind of parallel voltage-stabilizing integrated circuit) turn on and off, and then control the turn-on and turn-off of triode Q1.
Wherein, switching tube (the built-in control of such as DC brushless motor of the motor is arranged in the thermistor 102
The switching tube that device 110 uses) pre-determined distance in.
Such as: as shown in Fig. 2, by the way that NTC thermistor is placed on switching tube nearby come detection switch tube temperature degree.
As a result, in the pre-determined distance by the switching tube that thermistor is arranged in the built-in controller of motor, be conducive to
Promote the accuracy and reliability to the induction of the Current Temperatures of the switching tube, so promoted motor overheat protector is controlled it is reliable
Property and safety.
Optionally, the thermistor 102 may include: NTC thermistor 102 or PTC thermistor 102.
Such as: it can be directed to the practical application of thermal-shutdown circuit, thermistor can choose PTC in circuit, by outer
The setting of circuit is enclosed to reset turn-on and turn-off condition, to reach identical function.
Such as: NTC is thermistor, determines itself to prevent size by temperature sensor, and then control and be input to TL431
Pressure drop size；NTC can be used PTC and be replaced；Triode can be used positive-negative-positive and be replaced.
As a result, by the thermistor of diversified forms, be conducive to be promoted the Current Temperatures induction to the switching tube of motor
Accuracy also improves flexibility and convenience to motor overheat protector.
In an optional example, the divider resistance 104 is arranged in series with the thermistor 102, can be used for shape
The partial pressure branch of pairs of preset power supply, to realize the partial pressure control to the voltage regulation unit 106 and the control switch 108
System.Such as: the divider resistance 104 and the thermistor 102 are arranged in series in preset power supply (such as DC power supply
VDD) between earth signal (such as GND signal).
Wherein, the resistance value of the divider resistance 104, being capable of voltage value, the thermistor according to the power supply
Resistance value determination under the default overheat protector point obtains.
Such as: R1 is divider resistance, and the overheat protector point of switching tube can be set by calculating its resistance value.
Such as: to make switching tube work need to combine power of motor and actual test in reliable temperature range, design
Carry out the setting of temperature protection point.Setting NTC temperature sensor is 110 DEG C and is protected, and can be found according to the NTC specifications used
Temperature is 110 DEG C of corresponding NTC resistance value R0；Reference voltage since three terminal regulator TL431 is adjusted is 2.5V, is being switched
It is on state when the input voltage of power supply is more than upper limit voltage, then can calculates the resistance value of corresponding R1:
Such as: by choosing suitable R1 resistance value, shut down motor accurately in time in the overheat protector point of setting
Protection；According to the above calculation formula, it is assumed that VDD 5V chooses the NTC resistance of model 103KT1608T, and temperature is 110 DEG C
When, NTC resistance value is 770 Ω, and can calculate R1 resistance value at this time is 770 Ω.It accurately can timely be realized using this circuit
Motor overheat protector function, to guarantee the reliability and safety of motor.
As a result, by determining the resistance value of divider resistance, may be implemented to keep motor reliable in the default overheat protector point of motor
It shuts down, is conducive to promote the accuracy and timeliness to motor overheat protector, and then promote the reliability to motor overheat protector
And safety.
Optionally, the voltage regulation unit 106 may include: the three terminal regulator of model TL431.
Wherein, the reference edge of the three terminal regulator is connected to the public affairs of the thermistor 102 and the divider resistance 104
End, the cathode of the three terminal regulator are connected to the control terminal of the control switch 108 altogether, and the anode of the three terminal regulator connects
Ground.
Such as: TL431 then has accurate conducting voltage, therefore adjustable three terminal regulator (such as TL431) is used to carry out electricity
Machine overheat protector can realize that brshless DC motor is accurately shut down when switching tube temperature reaches certain value.
Such as: high-precision overheat protector is realized using the higher TL431 of switching accuracy.TL431 is that adjustable three ends are steady
Depressor, switching accuracy is higher, switching point only one, the switch of switch controls triode.
As a result, by selecting TL431 as voltage regulation unit, the reliability and accuracy of pressure stabilizing control can be protected
Card, and then the reliability to motor overheat protector can be promoted.
In an optional example, the voltage regulation unit 106 can be used for reaching the switching tube in the Current Temperatures
Default overheat protector point in the case where, be in off state, to control the control switch 108 conducting in conjunction with the partial pressure branch
And the controller 110 (built-in controller 110 of such as DC brushless motor) of low level signal to the motor is exported, so that described
Controller 110 can control the motor stopping according to the low level signal.Such as: as shown in Fig. 2, switching tube (such as three poles
Pipe Q1) when being more than safe range, NTC resistance value reduces temperature, and TL431 shutdown, Q1 conducting, FO (such as emitter of triode Q1) is defeated
Low level, which issues control signal to MCU, MCU, out makes motor stopping.In switching tube (such as switching tube Q1) temperature during the work time
When reaching overheat protector point (such as the safe range of setting), NTC resistance reduces, and electric resistance partial pressure pressure drop reduces, and causes adjustable
The input voltage for saving three terminal regulator is less than 2.5V, and TL431 is in off state, triode Q1 conducting, FO output low level at this time
To MUC, MCU, which issues control signal, makes motor stopping.
Such as: during specific implementation, it can also be protected in the default excess temperature that the Current Temperatures reach the switching tube
In the case where shield point, the reminder message of the switching tube excess temperature is initiated, is such as reminded with voice reminder message, buzzer warning, is aobvious
Display screen shows etc. that modes initiate reminder message.
Such as: increase switch tube temperature detection protect circuit, can effectively detection switch tube temperature degree accurately protected
Shield is shut down, and is avoided switching tube from burning out and is caused motor failure, is lost to effectively solve direct current generator caused by burning out as switching tube
Effect.Such as: can effectively detection switch tube temperature degree accurately carry out protection shutdown, avoid switching tube from burning out and cause motor failure,
The fraction defective after sale of motor can be effectively reduced, the reliability and safety of brshless DC motor are improved.
As a result, by the Current Temperatures of the switching tube of thermistor induction machine built-in controller, and then make voltage regulation unit
In off state, and the partial pressure branch to be formed of connecting in conjunction with thermistor and divider resistance makes control switch be connected and export low electricity
Ordinary mail number gives the built-in controller of motor, so that the built-in controller is made to make motor stopping according to the low level signal, so as to
By realizing the overheat protector to motor, and the timeliness and accuracy protected are guaranteed.
Optionally, the control switch 108 may include: NPN triode or PNP triode.
Such as: it can be directed to the practical application of thermal-shutdown circuit, three poles of model PNP can be used in Q1 in circuit
Pipe, resets turn-on and turn-off condition, by the setting of peripheral circuit to reach identical function.
Such as: Q1 is triode, carries out stoppage protection by controlling its switch to trigger MCU.
As a result, by the control switch of diversified forms, is conducive to be promoted to send in conjunction with voltage regulation unit to built-in controller and control
The accuracy of signal processed also improves flexibility and convenience to motor overheat protector.
More optionally, if the voltage regulation unit 106 may include the three terminal regulator of model TL431, temperature-sensitive electricity
It may include NPN triode that resistance 102, which may include NTC thermistor 102, the control switch 108, then the NPN triode
Control terminal of the base stage as the control switch 108, the emitter of the NPN triode is as the control switch 108
Output end is connected to the signal input part of the controller 110.The grounded collector of the NPN triode.
If the more described voltage regulation unit 106 may include that the three terminal regulator of model TL431, the thermistor 102 can
It may include PNP triode to include PTC thermistor 102, the control switch 108, then the base stage of the PNP triode is made
For the control terminal of the control switch 108, output end of the collector of the PNP triode as the control switch 108 connects
It is connected to the signal input part of the controller 110.The emitter of the NPN triode is grounded.
As a result, by being adapted to setting control planning according to the different form of voltage regulation unit, control switch and thermistor, have
Conducive to the reliability and flexibility for promoting the control to motor overheat protector, also improve to the convenient of motor overheat protector operation
Property.
In an optional example, the voltage regulation unit 106 can be also used for being not up to described open in the Current Temperatures
It is on state in the case where the default overheat protector point for closing pipe, to control the control switch 108 in conjunction with the partial pressure branch
The controller 110 of high level signal to the motor is turned off and exports, so that the controller 110 can be according to the high level
Signal controls the motor and operates normally.Such as: as shown in Fig. 2, NTC resistance value increases when switching tube temperature is less than safe range
Greatly, TL431 is connected, Q1 cut-off, and FO exports high level to MCU, and motor operates normally.It is working in switching tube (such as switching tube Q1)
When temperature is not up to overheat protector point in the process, NTC resistance increases, and electric resistance partial pressure pressure drop increases, and is input to adjustable three
The voltage of voltage-stablizer is held to be greater than 2.5V, TL431 is on state, triode Q1 cut-off, FO output high level to MUC, MCU at this time
Issuing control signal operates normally motor.
As a result, by making voltage regulation unit in the case where the Current Temperatures of the switching tube of motor are not up to overheat protector point
In on state, and the partial pressure branch to be formed of connecting in conjunction with thermistor and divider resistance turns off control switch and exports high electricity
Ordinary mail number gives the built-in controller of motor, so that the built-in controller is made to operate normally motor according to the high level signal, from
And avoid to the protection of the mistake of motor, reduce accidentally protective rate, improve motor operation reliability and overheat protector it is reliable
Property.
It can also include: the first shunt resistance (such as shunt resistance R2), the second shunt resistance in an optional example
At least one of (such as shunt resistance R3).
Such as: in Fig. 2, R2, R3 are current-limiting resistance.
In an optional example, first shunt resistance is arranged in the control terminal of the control switch 108 and presets
Power supply between, can be used for protecting the voltage regulation unit 106 and the control switch 108 (such as: to described
The control terminal of control switch 108 carries out flow-dividing control).
In an optional example, second shunt resistance is arranged in the output end of the control switch 108 and presets
Power supply between, can be used for protecting the voltage regulation unit 106 and the control switch 108 (such as: to described
The output end of control switch 108 carries out flow-dividing control).
Such as: as shown in Fig. 2, current-limiting resistance R2, R3 etc., electric current is excessive and damage when can be connected to avoid Q1 and TL431.
It is arranged as a result, by the adaptation of shunt resistance, is conducive to promote the safety to the control of motor overheat protector, in turn
It can better ensure that the reliability and accuracy to the control of motor overheat protector.
Through a large amount of verification experimental verification, using the technical solution of the present embodiment, by the guarantor for increasing switch tube temperature detection
Protection circuit can effectively be solved the failure of direct current generator caused by being burnt out as switching tube, promote protection reliability.
According to an embodiment of the invention, additionally providing a kind of motor of the over-temperature protection device corresponding to motor.The motor
It may include: the over-temperature protection device of above-described motor.
In an optional embodiment, it is contemplated that the switching tube that the built-in controller of DC brushless motor uses is in high speed
It can generate heat during turning on and off serious, if it exceeds the operating temperature range of switching tube, then will lead to switching tube and burn out.This
The scheme of invention is increased switch tube temperature detection and protects circuit, can effectively solve direct current caused by being burnt out as switching tube
Motor failure.
In an optional example, the invention proposes a kind of high-precision thermal-shutdown circuits, can effective detection switch
Tube temperature degree accurately carries out protection shutdown, avoids switching tube from burning out and causes motor failure.That is, one kind proposed by the present invention
High-precision thermal-shutdown circuit, can effectively detection switch tube temperature degree accurately carry out protection shutdown, avoid switching tube from burning out and make
At motor failure, the fraction defective after sale of motor can be effectively reduced, improves the reliability and safety of brshless DC motor.
In an optional specific example, the solution of the present invention, as shown in Fig. 2, by the way that NTC thermistor to be placed on out
It closes pipe and nearby carrys out detection switch tube temperature degree, thermistor NTC is affected by temperature, and resistance value changes to control adjustable three end
Voltage-stablizer (such as TL431, a kind of parallel voltage-stabilizing integrated circuit) turns on and off, and then controls conducting and the pass of triode Q1
It is disconnected.When switching tube (such as triode Q1) temperature is more than safe range, NTC resistance value reduces, TL431 shutdown, Q1 conducting, FO (such as three
The emitter of pole pipe Q1) low level is exported to MCU, MCU sending control signal makes motor stopping；Switching tube temperature is less than safety
When range, NTC resistance value increases, TL431 conducting, Q1 cut-off, and FO exports high level to MCU, and motor operates normally；Traditional excess temperature is protected
Protection circuit carries out FO low and high level realization motor overheat protector using turning on and off for triode, due to general triode Vbe
Conducting voltage be 0.7V~1.0V, conducting voltage voltage range is larger, may cause motor appearance accidentally protect or protect it is too late
When.TL431 then has accurate conducting voltage, therefore adjustable three terminal regulator (such as TL431) is used to carry out motor overheat protector
Brshless DC motor can be achieved accurately to shut down when switching tube temperature reaches certain value.
Wherein, in Fig. 2, Q1 is triode, by controlling the turn-on and turn-off of triode Q1, control FO output height electricity
Flat, TL431 is adjustable three terminal regulator, and NTC is thermistor, and R1 is divider resistance, be can be set by calculating its resistance value
The overheat protector point of switching tube；R2, R3 are current-limiting resistance.
Specifically, concrete operating principle of the invention is described as follows:
In switching tube (such as switching tube Q1), temperature reaches overheat protector point during the work time (such as the safe range of setting)
When, NTC resistance reduces, and electric resistance partial pressure pressure drop reduces, and cause the input voltage of adjustable three terminal regulator to be less than 2.5V, this
When TL431 be in off state, triode Q1 conducting, FO exports low level to MUC, and MCU, which issues control signal, makes motor stopping.
When temperature is not up to overheat protector point to switching tube (such as switching tube Q1) during the work time, NTC resistance increases
Greatly, electric resistance partial pressure pressure drop increases, and the voltage for being input to adjustable three terminal regulator is greater than 2.5V, and TL431 is on state at this time,
Triode Q1 cut-off, FO export high level to MUC, and MCU sending control signal operates normally motor.
Switching tube temperature range used at present is generally -55 DEG C -- and 150 DEG C, to make switching tube work in reliable temperature
Range, when design, need that power of motor and actual test is combined to carry out the setting of temperature protection point.
Such as: setting NTC temperature sensor is 110 DEG C and is protected that can find temperature according to the NTC specifications used is
110 DEG C of corresponding NTC resistance value R0；Reference voltage since three terminal regulator TL431 is adjusted is 2.5V, in Switching Power Supply
It is on state when input voltage is more than upper limit voltage, then can calculates the resistance value of corresponding R1:
The advantages of this circuit, is motor can be kept accurate in the overheat protector point of setting by choosing suitable R1 resistance value
Stoppage protection is carried out in time；According to the above calculation formula, it is assumed that VDD 5V chooses the NTC electricity of model 103KT1608T
Resistance, when temperature is 110 DEG C, NTC resistance value is 770 Ω, and can calculate R1 resistance value at this time is 770 Ω.
Motor overheat protector function accurately can be timely realized using this circuit, to guarantee the reliability of motor
And safety.
In an alternative example, it can be directed to the practical application of thermal-shutdown circuit, type can be used in Q1 in circuit
Number triode for being PNP, thermistor can choose PTC, turn-on and turn-off item reset by the setting of peripheral circuit
Part, to reach identical function.
The processing and function realized by the motor of the present embodiment essentially correspond to earlier figures 1 to device shown in Fig. 2
Embodiment, principle and example, therefore not detailed place in the description of the present embodiment may refer to mutually speaking on somebody's behalf in previous embodiment
Bright, this will not be repeated here.
Through a large amount of verification experimental verification, using technical solution of the present invention, by effective detection switch tube temperature degree accurately into
Row protection is shut down, and is avoided switching tube from burning out and is caused motor failure, and the reliability of protection and the safety of motor work are improved.
According to an embodiment of the invention, the excess temperature for additionally providing a kind of motor of the over-temperature protection device corresponding to motor is protected
Maintaining method.The flow diagram of one embodiment of method of the invention shown in Figure 3.The excess temperature protection method of the motor can be with
It include: step S110 to step S130.
At step S110, by thermistor 102, it can be used for incuding the Current Temperatures of the switching tube of the motor.
Switching tube (the opening of using of the built-in controller 110 of such as DC brushless motor of the motor is arranged in the thermistor 102
Close pipe) pre-determined distance in.
At step S120, the partial pressure branch to be formed is arranged in series by divider resistance 104 and thermistor 102, to pre-
If power supply divided, the partial pressure of voltage regulation unit 106 and control switch 108 is controlled with realizing.Such as: the partial pressure
Resistance 104 and the thermistor 102 are arranged in series in preset power supply (such as DC power supply VDD) and earth signal (such as
GND signal) between.
At step S130, by voltage regulation unit 106, protected in the default excess temperature that the Current Temperatures reach the switching tube
It is in off state in the case where shield point, exports low level to control the conducting of control switch 108 in conjunction with the partial pressure branch
Signal is realized and controls the motor stopping according to the low level signal.Such as: as shown in Fig. 2, switching tube (such as triode Q1)
When temperature is more than safe range, NTC resistance value reduces, TL431 shutdown, Q1 conducting, and FO (such as emitter of triode Q1) output is low
Level, which issues control signal to MCU, MCU, makes motor stopping.In switching tube (such as switching tube Q1), temperature reaches during the work time
When overheat protector point (such as the safe range of setting), NTC resistance reduces, and electric resistance partial pressure pressure drop reduces, and leads to adjustable three
The input voltage of voltage-stablizer is held to be less than 2.5V, TL431 is in off state at this time, and triode Q1 conducting, FO output low level is extremely
MUC, MCU, which issue control signal, makes motor stopping.
Such as: during specific implementation, it can also be protected in the default excess temperature that the Current Temperatures reach the switching tube
In the case where shield point, the reminder message of the switching tube excess temperature is initiated, is such as reminded with voice reminder message, buzzer warning, is aobvious
Display screen shows etc. that modes initiate reminder message.
Such as: increase switch tube temperature detection protect circuit, can effectively detection switch tube temperature degree accurately protected
Shield is shut down, and is avoided switching tube from burning out and is caused motor failure, is lost to effectively solve direct current generator caused by burning out as switching tube
Effect.Such as: can effectively detection switch tube temperature degree accurately carry out protection shutdown, avoid switching tube from burning out and cause motor failure,
The fraction defective after sale of motor can be effectively reduced, the reliability and safety of brshless DC motor are improved.
As a result, by the Current Temperatures of the switching tube of thermistor induction machine built-in controller, and then make voltage regulation unit
In off state, and the partial pressure branch to be formed of connecting in conjunction with thermistor and divider resistance makes control switch be connected and export low electricity
Ordinary mail number gives the built-in controller of motor, so that the built-in controller is made to make motor stopping according to the low level signal, so as to
By realizing the overheat protector to motor, and the timeliness and accuracy protected are guaranteed.
It can also include: to be not up to by voltage regulation unit 106 in the Current Temperatures in an optional embodiment
It is on state in the case where the default overheat protector point of the switching tube, to control the control in conjunction with the partial pressure branch
Switch 108 turns off and exports high level signal, realizes that controlling the motor according to the high level signal operates normally.Such as:
As shown in Fig. 2, NTC resistance value increases when switching tube temperature is less than safe range, and TL431 conducting, Q1 cut-off, the high electricity of FO output
It puts down to MCU, motor operates normally.When temperature is not up to overheat protector point to switching tube (such as switching tube Q1) during the work time,
NTC resistance increases, and electric resistance partial pressure pressure drop increases, and the voltage for being input to adjustable three terminal regulator is greater than 2.5V, at this time
TL431 is on state, and triode Q1 cut-off, FO output high level to MUC, MCU, which issues control signal, operates normally motor.
As a result, by making voltage regulation unit in the case where the Current Temperatures of the switching tube of motor are not up to overheat protector point
In on state, and the partial pressure branch to be formed of connecting in conjunction with thermistor and divider resistance turns off control switch and exports high electricity
Ordinary mail number gives the built-in controller of motor, so that the built-in controller is made to operate normally motor according to the high level signal, from
And avoid to the protection of the mistake of motor, reduce accidentally protective rate, improve motor operation reliability and overheat protector it is reliable
Property.
It can also include: by the first shunt resistance, to 106 He of voltage regulation unit in an optional embodiment
The control switch 108 is protected (such as: carrying out flow-dividing control to the control terminal of the control switch 108)；And/or it is logical
The second shunt resistance is crossed, can be used for protecting the voltage regulation unit 106 and the control switch 108 (such as: to described
The output end of control switch 108 carries out flow-dividing control).
Such as: in Fig. 2, R2, R3 are current-limiting resistance, and electric current is excessive and damage when can be connected to avoid Q1 and TL431.
It is arranged as a result, by the adaptation of shunt resistance, is conducive to promote the safety to the control of motor overheat protector, in turn
It can better ensure that the reliability and accuracy to the control of motor overheat protector.
The processing and function realized by the method for the present embodiment essentially correspond to the embodiment of aforementioned motor, principle and
Example, therefore not detailed place in the description of the present embodiment, may refer to the related description in previous embodiment, do not do herein superfluous
It states.
Through a large amount of verification experimental verification, using technical solution of the present invention, by effective detection switch tube temperature degree accurately into
Row protection is shut down, and is avoided switching tube from burning out and is caused motor failure, and the fraction defective after sale of motor can be effectively reduced, and is improved brushless
The reliability and safety of direct current generator.
To sum up, it will be readily appreciated by those skilled in the art that under the premise of not conflicting, above-mentioned each advantageous manner can be certainly
It combined, be superimposed by ground.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (11)
1. a kind of over-temperature protection device of motor characterized by comprising thermistor (102), divider resistance (104), pressure stabilizing
Unit (106) and control switch (108)；Wherein,
The thermistor (102), the Current Temperatures of the switching tube for incuding the motor；
The divider resistance (104) is arranged in series with the thermistor (102), is used to form and divides preset power supply
Branch is pressed, to realize that the partial pressure to the voltage regulation unit (106) and the control switch (108) controls；
The voltage regulation unit (106), the case where for reaching the default overheat protector point of the switching tube in the Current Temperatures
Under, it is in off state, exports low level signal to institute to control control switch (108) conducting in conjunction with the partial pressure branch
The controller (110) of motor is stated, so that the controller (110) controls the motor stopping according to the low level signal.
2. the apparatus according to claim 1, which is characterized in that the voltage regulation unit (106) is also used in the current temperature
It is on state in the case that degree is not up to the default overheat protector point of the switching tube, to be controlled in conjunction with the partial pressure branch
The control switch (108) turns off and exports high level signal to the controller (110), so that the controller (110) root
The motor is controlled according to the high level signal to operate normally.
3. device according to claim 1 or 2, which is characterized in that wherein,
The thermistor (102), is arranged in the pre-determined distance of the switching tube of the motor；
And/or
The resistance value of the divider resistance (104), can be according to the voltage value of the power supply, the thermistor described pre-
If the resistance value determination under overheat protector point obtains.
4. device described in one of -3 according to claim 1, which is characterized in that the voltage regulation unit (106), comprising: model
The three terminal regulator of TL431；
The reference edge of the three terminal regulator is connected to the common end of the thermistor (102) Yu the divider resistance (104),
The cathode of the three terminal regulator is connected to the control terminal of the control switch (108).
5. device described in one of -4 according to claim 1, which is characterized in that wherein,
The thermistor (102), comprising: NTC thermistor (102) or PTC thermistor (102)；And/or
The control switch (108), comprising: NPN triode or PNP triode.
6. device according to claim 5, which is characterized in that wherein,
If the voltage regulation unit (106) includes that the three terminal regulator of model TL431, the thermistor (102) include NTC heat
Quick resistance (102), the control switch (108) include NPN triode, then the base stage of the NPN triode is as the control
The control terminal of (108) is switched, output end of the emitter of the NPN triode as the control switch (108) is connected to institute
State the signal input part of controller (110)；
If the voltage regulation unit (106) includes that the three terminal regulator of model TL431, the thermistor (102) include PTC heat
Quick resistance (102), the control switch (108) include PNP triode, then the base stage of the PNP triode is as the control
The control terminal of (108) is switched, output end of the collector of the PNP triode as the control switch (108) is connected to institute
State the signal input part of controller (110).
7. device described in one of -6 according to claim 1, which is characterized in that further include: the first shunt resistance, second shunt electricity
At least one of resistance；Wherein,
First shunt resistance is arranged between the control terminal and preset power supply of the control switch (108), is used for
The voltage regulation unit (106) and the control switch (108) are protected；And/or
Second shunt resistance is arranged between the output end and preset power supply of the control switch (108), is used for
The voltage regulation unit (106) and the control switch (108) are protected.
8. a kind of motor characterized by comprising the over-temperature protection device of motor as claimed in claim 1.
9. a kind of excess temperature protection method of motor as claimed in claim 8 characterized by comprising
By thermistor (102), the Current Temperatures of the switching tube for incuding the motor；
Be arranged in series the partial pressure branch to be formed by divider resistance (104) and thermistor (102), to preset power supply into
Row partial pressure, to realize that the partial pressure to voltage regulation unit (106) and control switch (108) controls；
It is in the case where the Current Temperatures reach the default overheat protector point of the switching tube by voltage regulation unit (106)
Off state exports low level signal to control control switch (108) conducting in conjunction with the partial pressure branch, realizes basis
The low level signal controls the motor stopping.
10. according to the method described in claim 9, it is characterized by further comprising:
By voltage regulation unit (106), in the case where the Current Temperatures are not up to the default overheat protector point of the switching tube,
In on state, high level signal is exported to control control switch (108) shutdown in conjunction with the partial pressure branch, realizes root
The motor is controlled according to the high level signal to operate normally.
11. method according to claim 9 or 10, which is characterized in that further include:
By the first shunt resistance, the voltage regulation unit (106) and the control switch (108) are protected；And/or
By the second shunt resistance, for being protected to the voltage regulation unit (106) and the control switch (108).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810867073.9A CN109066594A (en) | 2018-08-01 | 2018-08-01 | A kind of over-temperature protection device of motor, motor and its excess temperature protection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810867073.9A CN109066594A (en) | 2018-08-01 | 2018-08-01 | A kind of over-temperature protection device of motor, motor and its excess temperature protection method |
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| CN109066594A true CN109066594A (en) | 2018-12-21 |
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| CN201810867073.9A Pending CN109066594A (en) | 2018-08-01 | 2018-08-01 | A kind of over-temperature protection device of motor, motor and its excess temperature protection method |
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| CN110829733A (en) * | 2019-10-24 | 2020-02-21 | 珠海凯邦电机制造有限公司 | Control panel, motor and air conditioning system |
| CN111175628A (en) * | 2020-01-06 | 2020-05-19 | 广东美的制冷设备有限公司 | Detection circuit and household electrical appliance |
| CN114879802A (en) * | 2022-06-23 | 2022-08-09 | 广东美的白色家电技术创新中心有限公司 | Current regulating device, method, device, equipment and medium |
| CN114967815A (en) * | 2022-06-23 | 2022-08-30 | 广东美的白色家电技术创新中心有限公司 | Voltage regulation device, method, device, equipment and medium |
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