CN208806604U - A kind of IPM protective device and motor - Google Patents
A kind of IPM protective device and motor Download PDFInfo
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- CN208806604U CN208806604U CN201821597781.7U CN201821597781U CN208806604U CN 208806604 U CN208806604 U CN 208806604U CN 201821597781 U CN201821597781 U CN 201821597781U CN 208806604 U CN208806604 U CN 208806604U
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Abstract
The utility model discloses a kind of IPM protective device and motor, which includes: current sampling circuit, the first current foldback circuit, the second current foldback circuit and controller；Wherein, the current sampling circuit for acquiring the three-phase current of IPM institute to be protected driving motor, and exports the first output signal in its own normal situation or exports the second output signal in the case where its own exception；First current foldback circuit, for realizing the overcurrent protection to IPM to be protected according to first output signal under the control of the controller；Second current foldback circuit, for realizing the overcurrent protection to IPM to be protected according to second output signal under the control of the controller.The embodiment of the utility model, can solve IPM internal power device after amplifier chip fails in current sampling circuit and be burned out has protection reliability difference, achievees the effect that promote protection reliability.
Description
Technical field
The utility model belongs to electric motor protecting technical field, and in particular to a kind of IPM protective device and motor, more particularly to
A kind of protection circuit (i.e. the protection circuit of motor three-phase current sampling amplifier failure) of IPM current sample amplifier failure has
The guard method of the IPM current sample amplifier of the motor of the circuit and motor failure.
Background technique
The motor of intelligent power module (Intelligent Power Module, abbreviation IPM) driving, three-phase current are logical
Resistance sampling is crossed, and amplifies through signal and realizes detection.If the amplifier chip of current sampling circuit fails, MCU can not obtain electricity
Machine three-phase current real value, judges that current of electric is too low, opens motor normal driving logic, persistently increases the duty ratio of PWM, leads
The machine actual current of sending a telegraph constantly increases, and burns IPM internal power device.
Utility model content
The purpose of this utility model is that in view of the foregoing drawbacks, a kind of IPM protective device and motor are provided, it is existing to solve
Have in technology in current sampling circuit that IPM internal power device is burned out asking there are protection reliability difference after amplifier chip failure
Topic achievees the effect that promote protection reliability.
The utility model provides a kind of IPM protective device, comprising: current sampling circuit, the first current foldback circuit, second
Current foldback circuit and controller；Wherein, the current sampling circuit, for acquiring the three-phase of IPM institute to be protected driving motor
Electric current, and export in its own normal situation the first output signal or in the case where its own exception output second it is defeated
Signal out；First current foldback circuit, for being realized under the control of the controller according to first output signal
Overcurrent protection to IPM to be protected；Second current foldback circuit, under the control of the controller according to described
Two output signals realize the overcurrent protection to IPM to be protected.
Optionally, the controller is also used to before the motor that IPM to be protected is driven is opened, determines that the electric current is adopted
Whether the IPM current sampling signal of sample circuit is normal；And if the IPM current sampling signal is normal, open the motor
Normal driving logic, operated normally with controlling the motor, and pass through described first in the first output signal overcurrent
Current foldback circuit realizes the overcurrent protection to IPM to be protected；If the IPM current sampling signal is abnormal, the electricity is closed
The normal driving logic of machine, to realize the overcurrent protection to IPM to be protected by second current foldback circuit.
Optionally, the current sampling circuit, comprising: motor three-phase current sampling resistor, the first operational amplifier, feedback
Resistance and the first pull down resistor；Wherein, the motor three-phase current sampling resistor, the three-phase current that IPM to be protected is arranged in are adopted
Collect between end and the non-inverting input terminal of first operational amplifier；The feedback resistance is arranged in first operation amplifier
Between the output end of device and the inverting input terminal of first operational amplifier；First pull down resistor, setting is described the
Between the output end of one operational amplifier and the first sample port of the controller；First operational amplifier is used for
The difference of first output signal that its non-inverting input terminal receives and the first reference signal that its reverse side provides is greater than the
High level signal is exported in the case where one setting value, on the contrary output low level signal.
Optionally, first current foldback circuit, comprising: sampled signal acquires resistance and second operational amplifier；Its
In, the sampled signal acquires resistance, be arranged in the current sampling circuit output end and the second operational amplifier
Between non-inverting input terminal；The second operational amplifier, in collected first output signal of its non-inverting input terminal
It is overturn in the case where the second reference signal provided greater than its inverting input terminal, output becomes high level from low level signal
First overcurrent protection signal of signal is to the overcurrent protection end of IPM to be protected；The controller is also used to basis and is believed by low level
The the first overcurrent protection signal for number becoming high level signal, closes the normal driving logic of the motor to realize to be protected
The overcurrent protection of IPM.
Optionally, second current foldback circuit, comprising: integrating circuit and transistor drive circuit；Wherein, the product
Parallel circuit is arranged between the output end of the current sampling circuit and the input terminal of the transistor drive circuit, is used for
Low level signal when second output signal of the current sampling circuit output is low level signal after output integral, on the contrary it is defeated
High level signal after integrating out；The transistor drive circuit, be arranged in the integrating circuit output end and the control
Between second sample port of device, for exporting low level signal in the case where the integrating circuit exports low level signal；
The controller is also used to closing the motor just in the case where the transistor drive circuit exports low level signal
Often driving logic is to realize the overcurrent protection to IPM to be protected.
Optionally, the integrating circuit, comprising: first resistor, second resistance, third operational amplifier and capacitor；Wherein,
The first resistor, be arranged in the current sampling circuit output end and the third operational amplifier inverting input terminal it
Between；The non-inverting input terminal of the third operational amplifier is arranged in the second resistance；The capacitor is arranged in the third
Between the output end of operational amplifier and the inverting input terminal of the third operational amplifier.
Optionally, the transistor drive circuit, comprising: current-limiting resistance, triode and the second pull down resistor；Wherein, institute
Current-limiting resistance is stated, is arranged between the output end of the integrating circuit and the base stage of the triode；The triode, comprising:
PNP type triode；Second pull down resistor, is arranged in the emitter of the triode；The emitter of the triode connects
To the second sample port of the controller；The collector of the triode connects the DC power supply of setting.
Match with above-mentioned apparatus, the utility model another further aspect provides a kind of motor, comprising: above-described IPM is protected
Protection unit.
The embodiment of the utility model is transported by being made of the sampling of motor three-phase current integrating circuit and transistor drive circuit
The protection circuit for putting failure solves the problems, such as that IPM internal power device is burned out after amplifier chip failure in current sampling circuit,
It ensure that normal operation, also ensure protection safety when sample circuit failure, high reliablity also helps and extends IPM's
Service life.
Further, the embodiment of the utility model, by constituting motor three-phase electricity by integrating circuit and transistor drive circuit
The protection circuit of stream sampling amplifier failure, after current sampling circuit failure, the integrated circuit of the output signal of sample circuit is made
It is connected with rear driving triode T, MCU identifies that overcurrent protection signal will close motor driven logic, and locking system can solve electric current
The problem of IPM inside modules power device is burned out after sample circuit failure, promotes protection reliability.
Further, the embodiment of the utility model, by the protection circuit being made of integrating circuit and transistor drive circuit,
Before motor is opened whether the exception of detection IPM current sampling signal；When IPM current sampling circuit exception, motor driven will be closed
Logic determines failure, system lock, and then IPM internal power device is protected not to be damaged, and protection reliability is high, safety is good.
The embodiment of the utility model as a result, is integrated by increasing on the basis of conventional motors three-phase current sample circuit
Circuit and transistor drive circuit form the protection circuit of motor three-phase current sampling amplifier failure, solve electric in the prior art
IPM internal power device, which is burned out, after amplifier chip fails in stream sample circuit has protection reliability difference, thus, gram
The clothes defect that protection reliability is poor in the prior art, safety difference and service life are short, realizes that protection reliability is good, safety is good
With beneficial effect with long service life.
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 IPM protective device of the utility model；
Fig. 2 is the structural schematic diagram of conventional motors three-phase current sample circuit；
Fig. 3 is the structural schematic diagram of an embodiment of the IPM protective device of the utility model, specially a kind of current sample
The structural schematic diagram of one embodiment of the protection circuit of amplifier failure；
Fig. 4 is the flow diagram of an embodiment of the IPM guard method of the motor of the utility model；
Fig. 5 be the utility model method in whether normally determined according to the IPM current sampling signal of current sampling circuit
The flow diagram for the embodiment of the normal driving logic of motor opened or closed；
Fig. 6 is by first current foldback circuit 20 in the method for the utility model according to first output signal
Realize the flow diagram of an embodiment of the overcurrent protection to IPM to be protected；
Fig. 7 is real according to second output signal by second current foldback circuit in the method for the utility model
Now to the flow diagram of an embodiment of the overcurrent protection of IPM to be protected.
In conjunction with attached drawing, appended drawing reference is as follows in the utility model embodiment:
10- current sampling circuit；The first current foldback circuit of 20-；The second current foldback circuit of 30-；40- controller is (such as
MCU)。
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 IPM protective device.The utility model shown in Figure 1
The structural schematic diagram of one embodiment of device.The IPM protective device may include: current sampling circuit 10, the first overcurrent protection
Circuit 20 (such as conventional motors three-phase current sample circuit 10), the second current foldback circuit 30 are (such as by integrating circuit and triode
Driving circuit constitute current sample amplifier failure protection circuit) and controller 40 (controller 40 of IPM such as to be protected, can
To select MCU etc.).
Specifically, the current sampling circuit 10 can be used in its own normal situation acquiring IPM institute to be protected
The three-phase current of driving motor, and the first output signal (such as amplifier A is exported in its own normal situation1It is defeated when normal
Signal U out0) or export in the case where its own exception the second output signal (such as amplifier A1Output signal U when abnormal0)。
Optionally, the current sampling circuit 10 may include: motor three-phase current sampling resistor (such as resistance R1、R2)、
First operational amplifier (such as amplifier A1), feedback resistance (such as resistance R4) and the first pull down resistor (such as resistance R5)。
Specifically, the motor three-phase current sampling resistor, be arranged in the three-phase current collection terminal of IPM to be protected with it is described
Between the non-inverting input terminal of first operational amplifier, it can be used for acquiring the three-phase current of IPM institute to be protected driving motor.
Specifically, the feedback resistance, the output end and first operation that first operational amplifier is arranged in are put
Between the inverting input terminal of big device, the reference signal of the reverse side of first operational amplifier may be used to provide.
Specifically, the output end and the controller of first operational amplifier is arranged in first pull down resistor
Between 40 the first sample port.
Specifically, first operational amplifier can be used for first output received in its non-inverting input terminal
The first reference signal that signal and its reverse side provide is (such as by resistance R3、R4The first determining reference signal) difference be greater than the
High level signal is exported in the case where one setting value, on the contrary output low level signal.
Such as: as shown in Figure 2 or Figure 3, resistance R1、R2For motor three-phase current sampling resistor, resistance R4For feedback resistance；
Amplifier A1For comparator, effect is to make the difference the signal of the current sampling signal of non-inverting input terminal and reverse side, and difference is greater than 0
High level is then exported, on the contrary output low level；Resistance R5For the pull down resistor of chip MCU sample port.
Pass through motor three-phase current sampling resistor, the first operational amplifier, feedback resistance and the first pull down resistor structure as a result,
At current sampling circuit, structure is simple and the reliability and the available guarantee of accuracy of acquisition.
Specifically, first current foldback circuit 20, be arranged in the output end of the current sampling circuit 10 with wait protect
It protects between the overcurrent protection end (i.e. the end OC) of IPM, can be used under the control of the controller 40 according to first output
Signal realizes the overcurrent protection to IPM to be protected.Such as: it, can be in the electric current by first current foldback circuit 20
Sample circuit 10 can be in the case that normal acquisition obtains the three-phase current, according to the three-phase current collected i.e.
One output signal realizes the overcurrent protection to IPM to be protected.
Optionally, first current foldback circuit 20 may include: sampled signal acquisition resistance (such as resistance R6、R7) and
Second operational amplifier (such as amplifier A2)。
Specifically, the sampled signal acquires resistance, and the output end and described the of the current sampling circuit 10 is arranged in
Between the non-inverting input terminal of two operational amplifiers, it can be used for acquiring the first output letter that the current sampling circuit 10 exports
Number.
Specifically, the second operational amplifier can be used in collected first output of its non-inverting input terminal
Signal is greater than second reference signal (such as V corresponding with the setting protective current of IPM to be protected that its inverting input terminal providesF)
In the case of overturn, output from low level signal becomes the first overcurrent protection signal of high level signal to IPM's to be protected
Overcurrent protection end (i.e. the end OC).
Specifically, the controller 40 can be also used for being become in second operational amplifier output by low level signal
In the case where the first overcurrent protection signal for high level signal, according to the first mistake for becoming high level signal from low level signal
Stream protection signal closes the normal driving logic (such as preset normal driving logic) of the motor to realize to be protected
The overcurrent protection of IPM.
Such as: as shown in Figure 2 or Figure 3, resistance R6、R7For sampling resistor, amplifier A is acquired1Whether the signal of output is greater than electricity
Press VF；Amplifier A2Effect with amplifier A1, VFFor a certain a reference value, value size in different circuits is also different.Motor three-phase electricity
Sample circuit, the sampled resistance sampling of three-phase current are flowed, and amplifies through amplifier signal and realizes detection.When current of electric is excessive,
Sampling resistor R7Partial pressure is greater than bias voltage VF, amplifier A2Overturning, output signal OC become high level, MCU identification from low level
Hardware overcurrent protection high level signal OC will close motor driven logic, and locking system protects IPM internal power device not burnt
It ruins.
Resistance is acquired by sampled signal as a result, and second operational amplifier constitutes the first current foldback circuit, Ke Yi
The overcurrent protection to IPM to be protected is reliably realized in the normal situation of current sampling circuit, and structure is simple, safety is good.
Specifically, output end and the control of the current sampling circuit 10 is arranged in second current foldback circuit 30
Between device 40 (controller 40 of IPM such as to be protected), it can be used for defeated according to described second under the control of the controller 40
Signal realizes the overcurrent protection to IPM to be protected out.Such as: by second current foldback circuit 30, adopted in the electric current
Sample circuit 10 fails and is unable in the case that normal acquisition obtains the three-phase current, according to the current sample in such cases
The second output signal that circuit 10 exports realizes the overcurrent protection to IPM to be protected.
Such as: as shown in figure 3, the protection circuit of motor three-phase current sampling amplifier failure, by integrating circuit and triode
Driving circuit is constituted.After current sampling circuit failure, amplifier A1Driving triode T is led after the integrated circuit function of output signal
Logical, MCU identifies that overcurrent protection signal will close motor driven logic, and locking system can solve IPM after current sampling circuit failure
The problem of inside modules power device is burned out.
The three-phase current for acquiring IPM institute to be protected driving motor by current sampling circuit as a result, is protected by the first overcurrent
Protection circuit realizes the overcurrent protection to IPM to be protected according to the three-phase circuit in the normal situation of current sampling circuit, and leads to
The second current foldback circuit is crossed to be realized in the case where current sampling circuit exception according to the output signal of the current sampling circuit
Overcurrent protection to IPM to be protected realizes the dual overcurrent protection to IPM to be protected, and greatly improve overcurrent protection can
By property and safety.
Optionally, second current foldback circuit 30, may include: integrating circuit and transistor drive circuit.
Specifically, the integrating circuit, the output end and the triode that the current sampling circuit 10 is arranged in drive
Between the input terminal of circuit, it can be used for detecting the current sampling circuit in the case where 10 exception of current sampling circuit
Second output signal of 10 outputs is exported when the second output signal of the current sampling circuit 10 output is low level signal
Low level signal after integral, otherwise the high level signal after output integral.
Such as: example shown in Fig. 3, compared to original motor three-phase current sample circuit (example as shown in Figure 2) its
Has the function of dual overcurrent protection；If comparator A1Damage, output signal are pulled down resistance R5Lasting draw is low level, fortune
Put A2Output signal OC is continuously low level, original current sampling circuit failure, and current of electric persistently increases and punctures IPM mould
Block, integrating circuit prevents current of electric excessive and punctures IPM module as a kind of detection circuit at this time.
Such as: Fig. 3 show the basic structure of the protection circuit of current sample amplifier failure, passes through acquisition before electric motor starting
Amplifier A in current sampling circuit1Output signal U0, via the current foldback circuit that integrating circuit and transistor amplifier are constituted,
Realize the function and protecting of current sampling circuit failure.Wherein, sample circuit output signal U0Integrated circuit function:
Powered on moment, that is, t1=0 moment, the voltage signal U on capacitor0(t1)=0, therefore the output signal U of integrating circuit1
Are as follows:
Wherein, U1For the output signal of integrating circuit, C is the negative-feedback capacitor of integrating circuit, R8For amplifier A3Reverse side
Input resistance, U0For amplifier A1Output signal, effect be use to determine whether driving triode T be connected.
More optionally, the integrating circuit may include: first resistor (such as resistance R8), second resistance (such as resistance R11)、
Third operational amplifier (such as amplifier A3) and capacitor (such as capacitor C).
Wherein, the output end and the third operation amplifier of the current sampling circuit 10 is arranged in the first resistor
Between the inverting input terminal of device.The non-inverting input terminal of the third operational amplifier is arranged in the second resistance, and such as setting exists
Between the non-inverting input terminal and ground of the third operational amplifier.The defeated of the third operational amplifier is arranged in the capacitor
Between outlet and the inverting input terminal of the third operational amplifier.
Such as: as shown in figure 3, amplifier A3For comparator, effect is referring to amplifier A1、A2；Amplifier A3With resistance R8、R11With
Capacitor C forms analog integrator circuit, and when input signal is low level, integrating circuit exports U1It is on the contrary for high electricity for low level
It is flat.
Integrating circuit is constituted by first resistor, second resistance, third operational amplifier and capacitor as a result, structure is simple,
And high reliablity.
Specifically, the output end and the controller 40 of the integrating circuit is arranged in the transistor drive circuit
Between second sample port, it can be used for exporting low level signal in the case where the integrating circuit exports low level signal.
Such as: when sample circuit (such as current sampling circuit 10) works normally, amplifier A1Output signal U0, amplitude and partially
Set voltage VFUnanimously, integrated circuit function exports high level signal U1, phase and U0On the contrary.Due to transistor amplifier
PNP type triode is selected, work is emitter junction forward bias, collector junction reverse bias in the external condition of magnifying state, because
This U1Driving triode is connected, at this time transistor amplifier output signal U2It is high level, MCU identification by low level pull-up
U2Protection signal will be ignored for high level to be failure to actuate.
Such as: when sample circuit (such as current sampling circuit 10) fails, amplifier A1Output signal is continuously low level U0, by
In integrating circuit essence be a summing circuit, therefore U0It is still low level, output signal U after integrated circuit function1It can not
Driving triode conducting, transistor amplifier output signal U2Through pull down resistor R10Effect sports low level by high level,
MCU identifies hardware overcurrent protection signal U2, motor normal driving logic is closed, locking system protects IPM internal power device not
It is burned out, while being shown fault code by manual operator or liquid crystal display.
More optionally, the transistor drive circuit may include: current-limiting resistance (such as resistance R9), triode (such as three poles
Pipe T) and the second pull down resistor (such as resistance R10)。
Wherein, the current-limiting resistance is arranged between the output end of the integrating circuit and the base stage of the triode.Institute
Triode is stated, may include: PNP type triode.Second pull down resistor, is arranged in the emitter of the triode, such as sets
It sets between the emitter and ground of the triode.The emitter of the triode is connected to the second sampling of the controller 40
The control signal output of port, the controller 40 is connected to the control signal input of IPM to be protected.The triode
Collector connects the DC power supply (such as Vcc) of setting.
Such as: as shown in figure 3, resistance R9For the current-limiting resistance of triode T, resistance R10For pull down resistor.
Transistor drive circuit is constituted by current-limiting resistance, triode and the second pull down resistor as a result, structure it is simple and
High reliablity that IPM to be protected is driven and protected, safety are good.
Specifically, the controller 40 can be also used for exporting the feelings of low level signal in the transistor drive circuit
Under condition, the normal driving logic (such as preset normal driving logic) of the motor is closed to realize to IPM to be protected
Overcurrent protection.
During specifically used, the transistor drive circuit can be also used for exporting high level in the integrating circuit
In the case where signal, is connected and exports high level signal.The controller 40, can be also used in the transistor drive circuit
The motor is controlled in the case where output high level signal to operate normally by normal driving logic.
The second current foldback circuit is constituted by integrating circuit and transistor drive circuit as a result, it can be in current sample
The overcurrent protection to IPM to be protected is reliably realized in the case where circuit abnormality, greatly improves the reliability and peace of overcurrent protection
Quan Xing extends the service life of IPM to be protected, saves maintenance cost.
In an optional embodiment, the controller 40 can be also used for opening in the motor that IPM to be protected is driven
Qi Qian determines whether the IPM current sampling signal of the current sampling circuit 10 is normal；And if the IPM current sample is believed
It is number normal, then the normal driving logic (such as preset normal driving logic) of the motor is opened, to control the motor
It operates normally, and passes through described the at the first output signal overcurrent (the setting protective current as being more than IPM to be protected)
One current foldback circuit 20 realizes the overcurrent protection to IPM to be protected；Alternatively, being closed if the IPM current sampling signal is abnormal
The normal driving logic (such as preset normal driving logic) of the motor is closed, to pass through second current foldback circuit
30 realize the overcurrent protection to IPM to be protected.
Such as: the protection circuit being made of integrating circuit and transistor drive circuit, detection IPM electric current is adopted before motor is opened
Whether the exception of sample signal.When IPM current sampling circuit works normally, normal motor driving logic, IPM current sample can be opened
When circuit abnormality, motor driven logic will be closed, determine failure, system lock, and then IPM internal power device is protected not damaged
It is bad.
Whether normally controlled by the controller of IPM to be protected according to the IPM current sampling signal of current sampling circuit as a result,
Opening or closing for the normal driving logic of motor processed, ensure that the normal operation of motor, in the case of also achieving over current of motor
Reliably protecting, control mode is easy, and the available guarantee of reliability and safety.
Through a large amount of verification experimental verification, using the technical solution of the utility model, by being driven by integrating circuit and triode
Circuit constitutes the protection circuit of motor three-phase current sampling amplifier failure, solves in current sampling circuit 10 after amplifier chip failure
The problem of IPM internal power device is burned out, ensure that normal operation, also ensure protection safety when sample circuit failure
Property, high reliablity also helps the service life for extending IPM.
Embodiment according to the present utility model additionally provides a kind of motor corresponding to IPM protective device.The motor can be with
It include: above-described IPM protective device.
In an optional embodiment, motor three-phase current sample circuit as shown in Figure 2.If amplifier A1Failure, electricity
Whether MCU can not detect the exception of current sampling signal before machine starts, it will continue to keep motor normal driving logic, it is lasting to increase
The duty ratio of PWM.When motor actual current is more than IPM module protection electric current, amplifier A1Output signal is through pull down resistor R5Effect
It keeps low level constant, amplifier A can not be driven2Overturning, hardware overcurrent protection function failure, leads to IPM internal power device quilt
It burns.Based on this, the embodiment of the utility model designs a kind of protection circuit of motor three-phase current sampling amplifier failure, solves electricity
The problem of IPM internal power device is burned out after amplifier chip failure in stream sample circuit.
In an optional example, as shown in figure 3, the embodiment of the utility model, designs a kind of motor three-phase current sampling
The protection circuit of amplifier failure, is made of integrating circuit and transistor drive circuit.After current sampling circuit failure, amplifier A1It is defeated
Driving triode T is connected after the integrated circuit function of signal out, and MCU identifies that overcurrent protection signal will close motor driven logic,
Locking system, IPM inside modules power device is burned out after can solving the problems, such as current sampling circuit failure.
Optionally, the embodiment of the utility model designs a kind of protection being made of integrating circuit and transistor drive circuit
Circuit, before motor is opened whether the exception of detection IPM current sampling signal.When IPM current sampling circuit works normally, it can open
Normal motor drives logic, when IPM current sampling circuit exception, will close motor driven logic, determines failure, system lock,
And then IPM internal power device is protected not to be damaged.
Such as: the operation is that the protection circuit being made of integrating circuit with transistor drive circuit is performed, and electric current is adopted
The failure of sample amplifier, exports always low level signal, and the protection circuit being made of at this time integrating circuit and transistor drive circuit will
Movement, so that IPM module be protected to burn because electric current persistently increases.If current sample amplifier chip fails, i.e., current sample is believed
Number exception, at this point, the signal of current sampling circuit output is low level, if chip is normal, the signal of output is high level, because
This, whether can judging abnormal by level conditions that current sample amplifier exports.
It, can be in conjunction with Fig. 2 and example shown in Fig. 3, to the side of the utility model in an optional specific embodiment
The specific implementation process of case illustrates.
In Fig. 2, resistance R1、R2For motor three-phase current sampling resistor, resistance R4For feedback resistance；Amplifier A1For comparator,
Its effect is to make the difference the signal of the current sampling signal of non-inverting input terminal and reverse side, and difference is greater than 0 and exports high level, instead
Output low level；Resistance R5For the pull down resistor of chip MCU sample port, resistance R6、R7For sampling resistor, amplifier A is acquired1
Whether the signal of output is greater than voltage VF；Amplifier A2Effect with amplifier A1, VFFor a certain a reference value, value is in different circuits
Size is also different.
Fig. 2 is motor three-phase current sample circuit, the sampled resistance sampling of three-phase current, and is amplified through amplifier signal real
Now detect.When current of electric is excessive, sampling resistor R7Partial pressure is greater than bias voltage VF, amplifier A2Overturning, output signal OC is by low
Level becomes high level, and MCU identification hardware overcurrent protection high level signal OC will close motor driven logic, and locking system is protected
Shield IPM internal power device is not burned out.If sample circuit amplifier chip A1Damage, output signal is through pull down resistor R5Effect
Keep low level constant, output signal can not drive amplifier A2Overturning, MCU can not identify hardware overcurrent protection high level signal
OC, and then motor normal driving logic is opened, cause IPM internal power device to be burned out.
In an optional specific example, in Fig. 3, amplifier A3For comparator, effect is referring to amplifier A1、A2；Amplifier A3With
Resistance R8、R11Analog integrator circuit is formed with capacitor C, when input signal is low level, integrating circuit exports U1For low level,
It otherwise is high level；Resistance R9For the current-limiting resistance of triode T, resistance R10For pull down resistor.
Example shown in Fig. 3, compared to original motor three-phase current sample circuit (example as shown in Figure 2), it has double
The function of overcurrent protection again；If comparator A1Damage, output signal are pulled down resistance R5Lasting draw is low level, amplifier A2It is defeated
Signal OC is continuously low level, original current sampling circuit failure out, and current of electric persistently increases and punctures IPM module, at this time
Integrating circuit prevents current of electric excessive and punctures IPM module as a kind of detection circuit.
Current foldback circuit embodiment: Fig. 3 show the basic structure of the protection circuit of current sample amplifier failure, electricity
Pass through amplifier A in acquisition current sampling circuit before machine starting1Output signal U0, via integrating circuit and transistor amplifier structure
At current foldback circuit, realize current sampling circuit failure function and protecting.Wherein, sample circuit output signal U0It is integrated
Circuit function:
Powered on moment, that is, t1=0 moment, the voltage signal U on capacitor0(t1)=0, therefore the output signal U of integrating circuit1
Are as follows:
Wherein, U1For the output signal of integrating circuit, C is the negative-feedback capacitor of integrating circuit, R8For amplifier A3Reverse side
Input resistance, U0For amplifier A1Output signal, effect be use to determine whether driving triode T be connected.
Optionally, when sample circuit works normally, amplifier A1Output signal U0, amplitude and bias voltage VFUnanimously, through product
Parallel circuit effect output high level signal U1, phase and U0On the contrary.Since transistor amplifier selects PNP type triode,
The external condition to work in magnifying state is emitter junction forward bias, collector junction reverse bias, therefore U1Driving triode is led
Lead to, at this time transistor amplifier output signal U2It is high level by low level pull-up, MCU identifies U2Guarantor will be ignored for high level
Shield signal is failure to actuate.
Wherein, MCU identifies U2The operation for protecting signal to be failure to actuate will be ignored for high level, can be and pass through software realization
, which can be set in program, if U2It is then failure to actuate for high level, then acts and protected if low level.
Optionally, when sample circuit fails, amplifier A1Output signal is continuously low level U0, since integrating circuit essence is
One summing circuit, therefore U0It is still low level, output signal U after integrated circuit function1Can not driving triode conducting,
Transistor amplifier output signal U2Through pull down resistor R10Effect sports low level by high level, and MCU identifies hardware overcurrent
Protect signal U2, motor normal driving logic is closed, locking system is protected IPM internal power device not to be burned out, passed through simultaneously
Manual operator or liquid crystal display show fault code.
For motor three-phase current sample circuit, can solve current sampling circuit failure causes what module burnt to ask
Topic.
The processing and function realized by the motor of the present embodiment essentially correspond to earlier figures 1 to device shown in Fig. 3
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 the technical solution of the utility model, by being driven by integrating circuit and triode
Circuit constitutes the protection circuit of motor three-phase current sampling amplifier failure, after the failure of current sampling circuit 10, sample circuit
Driving triode T is connected after the integrated circuit function of output signal, and MCU identifies that overcurrent protection signal is patrolled motor driven is closed
Volume, locking system, IPM inside modules power device is burned out after can solving the problems, such as the failure of current sampling circuit 10, is promoted and is protected
Protect reliability.
Embodiment according to the present utility model additionally provides a kind of IPM guard method of motor corresponding to motor, such as schemes
The flow diagram of one embodiment of the method for the utility model shown in 4.The IPM guard method of the motor may include: step
S110 to step S130.
At step S110, by current sampling circuit 10, IPM to be protected is acquired in its own normal situation and is driven
The three-phase current of dynamic motor, and the first output signal (such as amplifier A is exported in its own normal situation1Output when normal
Signal U0) or export in the case where its own exception the second output signal (such as amplifier A1Output signal U when abnormal0)。
Optionally, the three-phase of IPM institute to be protected driving motor is acquired by the current sampling circuit 10 in step S110
Electric current, mainly may include: by the first operational amplifier, first output signal that its non-inverting input terminal receives with
The first reference signal that its reverse side provides is (such as by resistance R3、R4The first determining reference signal) difference be greater than first setting
High level signal is exported in the case where value, on the contrary output low level signal.
Such as: as shown in Figure 2 or Figure 3, resistance R1、R2For motor three-phase current sampling resistor, resistance R4For feedback resistance；
Amplifier A1For comparator, effect is to make the difference the signal of the current sampling signal of non-inverting input terminal and reverse side, and difference is greater than 0
High level is then exported, on the contrary output low level；Resistance R5For the pull down resistor of chip MCU sample port.
Pass through motor three-phase current sampling resistor, the first operational amplifier, feedback resistance and the first pull down resistor structure as a result,
At current sampling circuit, structure is simple and the reliability and the available guarantee of accuracy of acquisition.
At step S120, protected by the overcurrent of output end and IPM to be protected that the current sampling circuit 10 is arranged in
The first current foldback circuit 20 between end (i.e. the end OC) is protected, according to described the under the control of the controller 40 of IPM to be protected
One output signal realizes the overcurrent protection to IPM to be protected.Such as: it, can be in institute by first current foldback circuit 20
Stating current sampling circuit 10 can be in the case that normal acquisition obtains the three-phase current, according to the three-phase electricity collected
Stream is overcurrent protection of the first output signal realization to IPM to be protected.
It is alternatively possible to pass through first current foldback circuit 20 in the method for the utility model as shown in connection with fig. 6
An embodiment flow diagram of the overcurrent protection to IPM to be protected is realized according to first output signal, further illustrates step
It is realized by first current foldback circuit 20 according to first output signal in rapid S120 and the overcurrent of IPM to be protected is protected
The detailed process of shield may include: step S310 and step S320.
Step S310 is big in collected first output signal of its non-inverting input terminal by second operational amplifier
In second reference signal (such as V corresponding with the setting protective current of IPM to be protected that its inverting input terminal providesF) in the case where
It is overturn, exports and protected from the first overcurrent protection signal to the overcurrent of IPM to be protected that low level signal becomes high level signal
It protects at end (i.e. the end OC).
Step S320 is also exported in the second operational amplifier and is believed by low level by the controller 40 of IPM to be protected
In the case where the first overcurrent protection signal for number becoming high level signal, become the of high level signal according to from low level signal
One overcurrent protection signal is closed the normal driving logic (such as preset normal driving logic) of the motor and is treated with realizing
Protect the overcurrent protection of IPM.
Such as: as shown in Figure 2 or Figure 3, resistance R6、R7For sampling resistor, amplifier A is acquired1Whether the signal of output is greater than electricity
Press VF；Amplifier A2Effect with amplifier A1, VFFor a certain a reference value, value size in different circuits is also different.Motor three-phase electricity
Sample circuit, the sampled resistance sampling of three-phase current are flowed, and amplifies through amplifier signal and realizes detection.When current of electric is excessive,
Sampling resistor R7Partial pressure is greater than bias voltage VF, amplifier A2Overturning, output signal OC become high level, MCU identification from low level
Hardware overcurrent protection high level signal OC will close motor driven logic, and locking system protects IPM internal power device not burnt
It ruins.
Resistance is acquired by sampled signal as a result, and second operational amplifier constitutes the first current foldback circuit, Ke Yi
The overcurrent protection to IPM to be protected is reliably realized in the normal situation of current sampling circuit, and structure is simple, safety is good.
It is (such as to be protected by output end and controller 40 that the current sampling circuit 10 is arranged at step S130
The controller 40 of IPM) between the second current foldback circuit 30, under the control of the controller 40 of IPM to be protected according to
Second output signal realizes the overcurrent protection to IPM to be protected.Such as: by second current foldback circuit 30, described
Current sampling circuit 10 fails and is unable in the case that normal acquisition obtains the three-phase current, according to the electricity in such cases
Flow overcurrent protection of the second output signal realization of the output of sample circuit 10 to IPM to be protected.
Such as: as shown in figure 3, the protection circuit of motor three-phase current sampling amplifier failure, by integrating circuit and triode
Driving circuit is constituted.After current sampling circuit failure, amplifier A1Driving triode T is led after the integrated circuit function of output signal
Logical, MCU identifies that overcurrent protection signal will close motor driven logic, and locking system can solve IPM after current sampling circuit failure
The problem of inside modules power device is burned out.
The three-phase current for acquiring IPM institute to be protected driving motor by current sampling circuit as a result, is protected by the first overcurrent
Protection circuit realizes the overcurrent protection to IPM to be protected according to the three-phase circuit in the normal situation of current sampling circuit, and leads to
The second current foldback circuit is crossed to be realized in the case where current sampling circuit exception according to the output signal of the current sampling circuit
Overcurrent protection to IPM to be protected realizes the dual overcurrent protection to IPM to be protected, and greatly improve overcurrent protection can
By property and safety.
It is alternatively possible to as shown in connection with fig. 7 in the method for the utility model by second current foldback circuit according to
Second output signal realizes an embodiment flow diagram of the overcurrent protection to IPM to be protected, and further explanation passes through
Second current foldback circuit realizes the detailed process of the overcurrent protection to IPM to be protected according to second output signal,
It may include: step S410 to step S430.
Step S410, by the way that the defeated of the output end of the current sampling circuit 10 and the transistor drive circuit is arranged in
Enter the integrating circuit between end, the current sampling circuit 10 is detected in the case where 10 exception of current sampling circuit and is exported
The second output signal, the current sampling circuit 10 output the second output signal be low level signal when output integral after
Low level signal, otherwise output integral after high level signal.
Step S420, by be arranged in the integrating circuit output end and the controller 40 the second sample port it
Between transistor drive circuit, the integrating circuit export low level signal in the case where, export low level signal.
Step S430 also exports low level signal in the transistor drive circuit by the controller 40 of IPM to be protected
In the case where, the normal driving logic (such as preset normal driving logic) of the motor is closed to realize to be protected
The overcurrent protection of IPM.
During specifically used, also by the transistor drive circuit, high level signal is exported in the integrating circuit
In the case where, it is connected and exports high level signal.Also pass through the controller 40 of IPM to be protected, also drives electricity in the triode
The motor is controlled in the case where road output high level signal to operate normally by normal driving logic.
The second current foldback circuit is constituted by integrating circuit and transistor drive circuit as a result, it can be in current sample
The overcurrent protection to IPM to be protected is reliably realized in the case where circuit abnormality, greatly improves the reliability and peace of overcurrent protection
Quan Xing extends the service life of IPM to be protected, saves maintenance cost.
In an optional embodiment, can also include: according to the IPM current sampling signal of current sampling circuit whether
The process of the normal normal driving logic for determining motor opened or closed.
It is according to the IPM current sampling signal of current sampling circuit below with reference in the method for the utility model shown in Fig. 5
The embodiment flow diagram of the normal driving logic of no normal determining motor opened or closed is further illustrated according to electricity
Whether the IPM current sampling signal of stream sample circuit normally determines the specific mistake of the normal driving logic of motor opened or closed
Journey may include: step S210 to step S230.
Step S210 also before the motor that IPM to be protected is driven is opened, is determined by the controller 40 of IPM to be protected
Whether the IPM current sampling signal of the current sampling circuit 10 is normal.And
Step S220 opens the normal driving logic of the motor (as in advance if the IPM current sampling signal is normal
The normal driving logic first set), it is operated normally with controlling the motor, and (be such as more than in the first output signal overcurrent
The setting protective current of IPM to be protected) when realized by first current foldback circuit 20 overcurrent of IPM to be protected protected
Shield.
Step S230 closes the normal driving logic of the motor (as in advance if the IPM current sampling signal is abnormal
The normal driving logic first set), to realize the overcurrent protection to IPM to be protected by second current foldback circuit 30.
Such as: the protection circuit being made of integrating circuit and transistor drive circuit, detection IPM electric current is adopted before motor is opened
Whether the exception of sample signal.When IPM current sampling circuit works normally, normal motor driving logic, IPM current sample can be opened
When circuit abnormality, motor driven logic will be closed, determine failure, system lock, and then IPM internal power device is protected not damaged
It is bad.
Whether normally controlled by the controller of IPM to be protected according to the IPM current sampling signal of current sampling circuit as a result,
Opening or closing for the normal driving logic of motor processed, ensure that the normal operation of motor, in the case of also achieving over current of motor
Reliably protecting, control mode is easy, and the available guarantee of reliability and safety.
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 the technical solution of the present embodiment, by driving electricity by integrating circuit and triode
The protection circuit that road is constituted, before motor is opened whether the exception of detection IPM current sampling signal；IPM current sampling circuit is abnormal
When, motor driven logic will be closed, determine failure, system lock, and then IPM internal power device is protected not to be damaged, protected
High reliablity, safety are good.
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 IPM protective device characterized by comprising current sampling circuit (10), the first current foldback circuit (20),
Second current foldback circuit (30) and controller (40)；Wherein,
The current sampling circuit (10), for acquiring the three-phase current of IPM institute to be protected driving motor, and it is normal at its own
In the case where export the first output signal or export the second output signal in the case where its own exception；
First current foldback circuit (20) is used under the control of the controller (40) according to first output signal
Realize the overcurrent protection to IPM to be protected；
Second current foldback circuit (30) is used under the control of the controller (40) according to second output signal
Realize the overcurrent protection to IPM to be protected.
2. the apparatus according to claim 1, which is characterized in that the controller (40) is also used to be driven in IPM to be protected
Before dynamic motor is opened, determine whether the IPM current sampling signal of the current sampling circuit (10) is normal；And
If the IPM current sampling signal is normal, the normal driving logic of the motor is opened, it is normal to control the motor
Operation, and realized by first current foldback circuit (20) to IPM's to be protected in the first output signal overcurrent
Overcurrent protection；
If the IPM current sampling signal is abnormal, the normal driving logic of the motor is closed, to pass through second overcurrent
Circuit (30) are protected to realize the overcurrent protection to IPM to be protected.
3. device according to claim 1 or 2, which is characterized in that the current sampling circuit (10), comprising: motor three
Phase current sampling resistance, the first operational amplifier, feedback resistance and the first pull down resistor；Wherein,
The motor three-phase current sampling resistor, the three-phase current collection terminal and first operation that IPM to be protected is arranged in are put
Between the non-inverting input terminal of big device；
The feedback resistance, the reverse phase that the output end and first operational amplifier of first operational amplifier is arranged in are defeated
Enter between end；
First pull down resistor, the output end and the first of the controller (40) that first operational amplifier is arranged in are adopted
Between sample port；
First operational amplifier, first output signal for receiving in its non-inverting input terminal are mentioned with its reverse side
The difference of the first reference signal supplied exports high level signal in the case where being greater than the first setting value, otherwise output low level letter
Number.
4. device according to claim 1 or 2, which is characterized in that first current foldback circuit (20), comprising: adopt
Sample signal acquisition resistance and second operational amplifier；Wherein,
The sampled signal acquires resistance, and output end and second operation amplifier in the current sampling circuit (10) is arranged
Between the non-inverting input terminal of device；
The second operational amplifier, it is defeated for being greater than its reverse phase in collected first output signal of its non-inverting input terminal
It is overturn in the case where entering the second reference signal that end provides, output is become the first mistake of high level signal from low level signal
Stream protects signal to the overcurrent protection end of IPM to be protected；
The controller (40) is also used to be closed according to the first overcurrent protection signal for becoming high level signal from low level signal
The normal driving logic of the motor is closed to realize the overcurrent protection to IPM to be protected.
5. device according to claim 1 or 2, which is characterized in that second current foldback circuit (30), comprising: product
Parallel circuit and transistor drive circuit；Wherein,
The input in the output end and the transistor drive circuit of the current sampling circuit (10) is arranged in the integrating circuit
Between end, after the output integral when the second output signal that the current sampling circuit (10) export is low level signal
Low level signal, otherwise the high level signal after output integral；
The output end of the integrating circuit and second sampling end of the controller (40) is arranged in the transistor drive circuit
Between mouthful, for exporting low level signal in the case where the integrating circuit exports low level signal；
The controller (40) is also used in the case where the transistor drive circuit exports low level signal, described in closing
The normal driving logic of motor is to realize the overcurrent protection to IPM to be protected.
6. device according to claim 5, which is characterized in that the integrating circuit, comprising: first resistor, second resistance,
Third operational amplifier and capacitor；Wherein,
The reverse phase of the output end and the third operational amplifier in the current sampling circuit (10) is arranged in the first resistor
Between input terminal；
The non-inverting input terminal of the third operational amplifier is arranged in the second resistance；
The output end of the third operational amplifier and the inverting input terminal of the third operational amplifier is arranged in the capacitor
Between.
7. device according to claim 5, which is characterized in that the transistor drive circuit, comprising: current-limiting resistance, three
Pole pipe and the second pull down resistor；Wherein,
The current-limiting resistance is arranged between the output end of the integrating circuit and the base stage of the triode；The triode,
It include: PNP type triode；
Second pull down resistor, is arranged in the emitter of the triode；The emitter of the triode is connected to the control
Second sample port of device (40) processed；The collector of the triode connects the DC power supply of setting.
8. a kind of motor characterized by comprising IPM protective device as claimed in claim 1.
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| CN201821597781.7U CN208806604U (en) | 2018-09-28 | 2018-09-28 | A kind of IPM protective device and motor |
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| CN201821597781.7U CN208806604U (en) | 2018-09-28 | 2018-09-28 | A kind of IPM protective device and motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193569A (en) * | 2018-09-28 | 2019-01-11 | 珠海格力电器股份有限公司 | A kind of IPM protective device, motor and its IPM guard method |
| CN110369160A (en) * | 2019-06-25 | 2019-10-25 | 深圳市四方电气技术有限公司 | Centrifuge driver protects circuit |
-
2018
- 2018-09-28 CN CN201821597781.7U patent/CN208806604U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193569A (en) * | 2018-09-28 | 2019-01-11 | 珠海格力电器股份有限公司 | A kind of IPM protective device, motor and its IPM guard method |
| CN110369160A (en) * | 2019-06-25 | 2019-10-25 | 深圳市四方电气技术有限公司 | Centrifuge driver protects circuit |
| CN110369160B (en) * | 2019-06-25 | 2021-07-30 | 深圳市四方电气技术有限公司 | Centrifuge driver protection circuit |
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