CN208423776U - A kind of over-temperature protection device and motor of motor - Google Patents
A kind of over-temperature protection device and motor of motor Download PDFInfo
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- CN208423776U CN208423776U CN201821236655.9U CN201821236655U CN208423776U CN 208423776 U CN208423776 U CN 208423776U CN 201821236655 U CN201821236655 U CN 201821236655U CN 208423776 U CN208423776 U CN 208423776U
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Abstract
The utility model discloses a kind of over-temperature protection device of motor and motor, 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 embodiment of the utility model 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 utility model belongs to temperature protection technical field, and in particular to a kind of over-temperature protection device and motor of motor,
More particularly to a kind of high-precision thermal-shutdown circuit, the overheat protector with the motor of the thermal-shutdown circuit and the motor
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.
Utility model content
The purpose of this utility model is that in view of the foregoing drawbacks, the over-temperature protection device and motor of a kind of motor are provided, with
It solves the problems, such as to carry out excess temperature stoppage protection by the switch of control triode in the prior art that there are protection reliabilities is poor, reaches
To the effect for promoting protection reliability.
The utility model 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；Described point
Piezoresistance is arranged in series with the thermistor, is used to form the partial pressure branch to preset power supply, to realize to described
The control of the partial pressure of voltage regulation unit and the control switch；The voltage regulation unit, for reaching the switch in the Current Temperatures
It is in off state in the case where the default overheat protector point of pipe, to control the control switch conducting in conjunction with the partial pressure branch
And the controller of low level signal to the motor is exported, so that the controller controls the electricity according to the low level signal
Machine is shut down.
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, the utility model another further aspect provides a kind of motor, comprising: above-described motor
Over-temperature protection device.
The embodiment of the utility model, by increase switch tube temperature detection protection circuit, can effectively solve due to
The failure of direct current generator caused by switching tube is burnt out, promotes protection reliability.
Further, the embodiment of the utility model accurately carries out protection shutdown by effective detection switch tube temperature degree, avoids
Switching tube, which is burnt out, causes motor failure, improves the reliability of protection and the safety of motor work.
Further, the embodiment of the utility model accurately carries out protection shutdown by effective detection switch tube temperature degree, avoids
Switching tube, which is burnt out, causes motor failure, can effectively reduce the fraction defective after sale of motor, improve the reliable of brshless DC motor
Property and safety.
The embodiment of the utility model as a result, by using the effective detection switch tube temperature degree of adjustable three terminal regulator, in turn
Motor overheat protector is carried out, it can be achieved that brshless DC motor is accurately shut down when switching tube temperature reaches certain value, solution is existing
Carrying out excess temperature stoppage protection in technology by the switch of control triode has protection reliability difference, thus, overcome
Protection reliability is poor in the prior art, accidentally protective rate is high and protects the defect of timeliness difference, realizes that protection reliability is good, accidentally protects
The beneficial effect that rate is low and protection timeliness is good.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood and implementing the utility model.
Below by drawings and examples, the technical solution of the utility model is 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 the motor of the utility model；
Fig. 2 is the electronic schematic diagram of an embodiment of the over-temperature protection device of the motor of the utility model；
Fig. 3 is the flow diagram of an embodiment of the excess temperature protection method of the motor of the utility model.
In conjunction with attached drawing, appended drawing reference is as follows in the utility model embodiment:
102- thermistor；104- divider resistance；106- voltage regulation unit；108- control switch；110- controller.
Specific embodiment
It is specific below in conjunction with the utility model to keep the purpose of this utility model, technical solution and advantage clearer
Technical solutions of the utility model are clearly and completely described in embodiment and corresponding attached drawing.Obviously, described embodiment
It is only the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained without making creative work, belongs to the utility model
The range of protection.
Embodiment according to the present utility model provides a kind of over-temperature protection device of motor, this is practical new as shown in Figure 1
The structural schematic diagram of one embodiment of the device of type.The over-temperature protection device of the motor may include: 102 (such as NTC of thermistor
Resistance, PTC resistor 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.
Embodiment according to the present utility model additionally provides a kind of motor of the over-temperature protection device corresponding to motor.It should
Motor 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 utility model is increased switch tube temperature detection and protects circuit, can effectively solved caused by being burnt out as switching tube
Direct current generator failure.
In an optional example, the utility model proposes a kind of high-precision thermal-shutdown circuits, can effectively detect
Switching tube temperature accurately carries out protection shutdown, avoids switching tube from burning out and causes motor failure.That is, the utility model mentions
A kind of high-precision thermal-shutdown circuit out, can effectively detection switch tube temperature degree accurately carry out protection shutdown, avoid 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.
In an optional specific example, the embodiment of the utility model, as shown in Fig. 2, by placing NTC thermistor
Carry out detection switch tube temperature degree near switching tube, thermistor NTC is affected by temperature, and resistance value changes adjustable to control
Three terminal regulator (such as TL431, a kind of parallel voltage-stabilizing integrated circuit) turns on and off, so control triode Q1 conducting and
Shutdown.When switching tube (such as triode Q1) temperature is more than safe range, NTC resistance value reduces, and TL431 shutdown, Q1 conducting, FO is (such as
The emitter of triode Q1) low level is exported to MCU, MCU sending control signal makes motor stopping；Switching tube temperature is less than peace
When gamut, NTC resistance value increases, TL431 conducting, Q1 cut-off, and FO exports high level to MCU, and motor operates normally；Traditional excess temperature
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 is 0.7V~1.0V, and conducting voltage voltage range is larger, may cause motor and occurs accidentally protecting or protect not
In time.TL431 then has accurate conducting voltage, therefore adjustable three terminal regulator (such as TL431) is used to carry out motor excess temperature guarantor
Achievable brshless DC motor is protected 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, the concrete operating principle of the utility model 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.
It is accurate by effective detection switch tube temperature degree using the technical solution of the utility model through a large amount of verification experimental verification
Ground carries out protection shutdown, avoids switching tube from burning out and causes motor failure, improves the reliability of protection and the safety of motor work
Property.
Embodiment according to the present utility model additionally provides a kind of mistake of motor of the over-temperature protection device corresponding to motor
Warm guard method.The flow diagram of one embodiment of the method for the utility model shown in Figure 3.The overheat protector of the motor
Method may 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.
It is accurate by effective detection switch tube temperature degree using the technical solution of the utility model through a large amount of verification experimental verification
Ground carries out protection shutdown, avoids switching tube from burning out and causes motor failure, can effectively reduce the fraction defective after sale of motor, improves
The reliability and safety of brshless DC motor.
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 the embodiments of the present invention, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of the claims of the utility model.
Claims (8)
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 according to claim 1 or 2, 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 according to claim 1 or 2, 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 according to claim 1 or 2, which is characterized in that further include: the first shunt resistance, the second shunt resistance
At least one of；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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821236655.9U CN208423776U (en) | 2018-08-01 | 2018-08-01 | A kind of over-temperature protection device and motor of motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821236655.9U CN208423776U (en) | 2018-08-01 | 2018-08-01 | A kind of over-temperature protection device and motor of motor |
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| CN208423776U true CN208423776U (en) | 2019-01-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066594A (en) * | 2018-08-01 | 2018-12-21 | 珠海格力电器股份有限公司 | A kind of over-temperature protection device of motor, motor and its excess temperature protection method |
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2018
- 2018-08-01 CN CN201821236655.9U patent/CN208423776U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066594A (en) * | 2018-08-01 | 2018-12-21 | 珠海格力电器股份有限公司 | A kind of over-temperature protection device of motor, motor and its excess temperature protection method |
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