CN109802527A - A kind of thermal-shutdown circuit and electric machine controller - Google Patents
A kind of thermal-shutdown circuit and electric machine controller Download PDFInfo
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- CN109802527A CN109802527A CN201811593766.XA CN201811593766A CN109802527A CN 109802527 A CN109802527 A CN 109802527A CN 201811593766 A CN201811593766 A CN 201811593766A CN 109802527 A CN109802527 A CN 109802527A
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Abstract
This application discloses a kind of thermal-shutdown circuit and electric machine controllers; the thermal-shutdown circuit includes anti-clutter circuit, comparison control circuit and processing circuit; anti-clutter circuit is used for the voltage triggered overheat protector for preventing from exporting when intelligent power module overcurrent; first predeterminated voltage is provided; the output voltage for comparing the first predeterminated voltage and intelligent power module exports the first comparison voltage to processing circuit；Comparison control circuit is for providing the second predeterminated voltage, compare the output voltage of the second predeterminated voltage and intelligent power module, the second comparison voltage is exported to processing circuit, processing circuit is used for according to the first comparison voltage and the second comparison voltage, corresponding signal is exported to micro-control unit, so that micro-control unit, which controls intelligent power module when determining intelligent power module and being in over-temperature condition, is in off working state.By the above-mentioned means, the application can monitor intelligent power module whether excess temperature, improve safety, effectively prevent interference of the overcurrent to thermal-shutdown circuit.
Description
Technical field
This application involves electronic technology fields, and in particular to a kind of thermal-shutdown circuit and electric machine controller.
Background technique
Intelligent power module (IPM, Intelligent Power Module) is not only device for power switching and driving electricity
Road integrates, and inside is also integrated with the fault detection circuits such as overcurrent and excess temperature, and can send feedback signal to
Processor.
Present inventor has found in long-term R & D, as shown in Figure 1, the inside temperature of traditional monitoring intelligent power module
The method of degree be by external pull-up resistor R1, when intelligent power module temperature changes, the resistance value of thermistor R2 also phase
It changes with answering, gives micro-control unit (MCU, Microcontroller Unit) after dividing by external pull-up resistor R1
Analog-to-digital conversion module (ADC, Analog-to-Digital Converter), pass through analog-to-digital conversion module acquire voltage value
Intelligent power module internal temperature is obtained indirectly.But since intelligent power module side is high voltage, micro-control unit side is
Low-voltage, high reference voltage end and low reference voltage end are connected directly and bring the integrity problem of system, if using isolation
Device, the linear isolation device of use increase additional cost and system complexity again.
Summary of the invention
The application mainly solves the problems, such as to be to provide a kind of thermal-shutdown circuit and electric machine controller, can monitor intelligent function
Rate module whether excess temperature, improve safety, and interference of the overcurrent to thermal-shutdown circuit can be effectively prevent.
In order to solve the above technical problems, the application is the technical solution adopted is that provide a kind of thermal-shutdown circuit, the excess temperature
Protection circuit includes: anti-clutter circuit, comparison control circuit and processing circuit, and anti-clutter circuit is for preventing intelligent power mould
The voltage triggered overheat protector exported when block overcurrent, provides the first predeterminated voltage, and compares the first predeterminated voltage and intelligent power
The output voltage of module exports the first comparison voltage to processing circuit, wherein the first predeterminated voltage is greater than intelligent power module and exists
Output voltage when overcurrent；Comparison control circuit compares the second predeterminated voltage and intelligent function for providing the second predeterminated voltage
The output voltage of rate module, exports the second comparison voltage to processing circuit, processing circuit respectively with anti-clutter circuit and compared with
Control circuit connection, for according to the first comparison voltage and the second comparison voltage, exporting corresponding signal to micro-control unit, with
So that micro-control unit gets the corresponding state of output voltage of intelligent power module, and determining at intelligent power module
Intelligent power module is controlled when over-temperature condition and is in off working state, wherein the second predeterminated voltage is intelligent power module institute
Allow the corresponding voltage value of the upper limit of temperature, the first predeterminated voltage is less than the second predeterminated voltage.
In order to solve the above technical problems, another technical solution that the application uses is to provide a kind of electric machine controller, the electricity
Machine controller includes: intelligent power module, micro-control unit and thermal-shutdown circuit, and micro-control unit is wide for exporting pulse
Modulated signal is spent, to control intelligent power module driving motor, intelligent power module is for detecting own temperature, and by temperature value
It is converted into corresponding voltage value and is sent to thermal-shutdown circuit, thermal-shutdown circuit is used for the voltage exported to intelligent power module
Value is handled, and processing result is sent to micro-control unit, so that micro-control unit is determining intelligent power module
After over-temperature condition, stop output pulse width modulated signal, so that motor is in shutdown status；Wherein, overheat protector
Circuit is above-mentioned thermal-shutdown circuit.
Through the above scheme, the beneficial effect of the application is: being provided respectively using anti-clutter circuit and comparison control circuit
First predeterminated voltage and the second predeterminated voltage, and be respectively compared intelligent power module output voltage and the first predeterminated voltage and
The size of second predeterminated voltage exports the first comparison voltage and the second comparison voltage to processing circuit, so that processing circuit root
According to the first output voltage and the second output voltage, corresponding signal is exported to micro-control unit, micro-control unit is obtained
Taking intelligent power module, whether excess temperature improves safety, prevents intelligent power mould in order to which micro-control unit takes movement in time
The internal temperature of block is excessively high to burn circuit, and can effectively prevent interference of the overcurrent to thermal-shutdown circuit.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.Wherein:
Fig. 1 is the structural schematic diagram for detecting the internal temperature of intelligent power module in the prior art；
Fig. 2 is the structural schematic diagram of one embodiment of thermal-shutdown circuit provided by the present application；
Fig. 3 is the structural schematic diagram of another embodiment of thermal-shutdown circuit provided by the present application；
Fig. 4 is the structural schematic diagram of one embodiment of electric machine controller provided by the present application.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, rather than whole embodiments.Based on this
Embodiment in application, those of ordinary skill in the art are obtained every other under the premise of not making creative labor
Embodiment shall fall in the protection scope of this application.
In some specific utilizations, limitation electric current to be arranged smaller, and instantaneous large-current is had when starting powers on,
And intelligent power module has been internally integrated overcurrent processing circuit, when intelligent power module detects overcurrent, own can pass through
Inter-process is more than limits value to prevent electric current current limit to setting value, so overcurrent is not necessarily to outer treatment circuit intervention,
And excess temperature condition needs, but overcurrent condition can interfere the judgement to excess temperature condition again, thus present applicant proposes prevented from draining off
The thermal-shutdown circuit disturbed.
Referring to Fig.2, Fig. 2 is the structural schematic diagram of one embodiment of thermal-shutdown circuit provided by the present application, the overheat protector
Circuit includes: anti-clutter circuit 21, comparison control circuit 22 and processing circuit 23.
Anti-clutter circuit 21 is used to prevent the voltage triggered overheat protector that exports when 24 overcurrent of intelligent power module, provides the
One predeterminated voltage, and compare the output voltage of the first predeterminated voltage and intelligent power module 24, the first comparison voltage is exported to place
Circuit 23 is managed, the first predeterminated voltage corresponds to output voltage of the intelligent power module 24 in overcurrent, in a specific implementation
In example, the first predeterminated voltage can be slightly larger than output voltage of the intelligent power module 24 in overcurrent.
Anti-clutter circuit 21 generates the first predeterminated voltage, and the output voltage of intelligent power module 24 and first is default electric
Pressure is compared；When the output voltage of intelligent power module 24 is greater than the first predeterminated voltage, anti-clutter circuit 21 exports high electricity
Flat, the first comparison voltage is high level, this first comparison voltage is transmitted to processing circuit 23 by anti-clutter circuit 21；When intelligent function
When the output voltage of rate module 24 is less than the first predeterminated voltage, anti-clutter circuit 21 exports low level, and the first comparison voltage is low
This first comparison voltage is transmitted to processing circuit 23 by level, anti-clutter circuit 21.
Comparison control circuit 22 compares the second predeterminated voltage and intelligent power module 24 for providing the second predeterminated voltage
Output voltage, export the second comparison voltage to processing circuit 23.
Processing circuit is connect with anti-clutter circuit 21 and comparison control circuit 22 respectively, for according to the first comparison voltage
With the second comparison voltage, corresponding signal is exported to micro-control unit 25, so that micro-control unit 25 gets intelligent power
The corresponding state of the output voltage of module 24, the second predeterminated voltage are corresponding by the upper limit of the permission temperature of intelligent power module 24
Voltage value, the first predeterminated voltage is less than the second predeterminated voltage, and in a specific embodiment, the second predeterminated voltage can be
The corresponding voltage of maximum temperature that intelligent power module 24 allows.
Comparison control circuit 22 generates the second predeterminated voltage, by the output voltage of intelligent power module 24 and the second default electricity
Pressure is compared；When the output voltage of intelligent power module 24 is greater than the second predeterminated voltage, comparison control circuit 22 exports low
Level, the second comparison voltage are low level, this second comparison voltage is transmitted to processing circuit 23 by comparison control circuit 22；When
When the output voltage of intelligent power module 24 is less than the second predeterminated voltage, comparison control circuit 22 exports high level, and second compares
Voltage is high level, this second comparison voltage is transmitted to processing circuit 23 by comparison control circuit 22.
The output of comparison control circuit 22 is two states: low level and high level, when only comparison control circuit 22 is deposited
When, output voltage is transmitted to micro-control unit 25 by comparison control circuit 22, at this time can when 24 overcurrent of intelligent power module
Overheat protector mechanism can be triggered, influence the validity of circuit.
For example, exporting low level when 24 excess temperature of intelligent power module, low level promotes comparison control circuit 22 to export height
Level, and work as circuit on startup, there may be the situation that electric current increases suddenly, immediate current is very big, causes intelligent power
24 output voltage of module is 0, high level will be exported merely with comparison control circuit 22 at this time, so that intelligent power module 24 is stopped
It only works, interference intelligent power module 24 works.
When anti-clutter circuit 21 is added, processing circuit 23 can be sentenced according to the first comparison voltage and the second comparison voltage
It is disconnected whether excess temperature；For example, the first comparison voltage is high level when excess temperature, the second comparison voltage is high level, processing circuit 23
High level is exported, overheat protector mechanism is triggered, and when overcurrent, the first comparison voltage is low level, and the second comparison voltage is high electricity
Flat, processing circuit 23 exports low level, will not trigger overheat protector mechanism.
It is to be appreciated that isolation circuit 26 is provided between intelligent power module 24 and micro-control unit 25, for being isolated
Intelligent power module 24 and micro-control unit 25, micro-control unit 25 can control intelligent power module by isolation circuit 26
24 working condition stops working when so that intelligent power module 24 being in over-temperature condition.
The present embodiment provides the first predeterminated voltage and second in advance by anti-clutter circuit 21 and comparison control circuit 22 respectively
If voltage, and it is respectively compared the output voltage and the first predeterminated voltage and the second predeterminated voltage of intelligent power module 24, output
First comparison voltage and the second comparison voltage are to processing circuit 23, so that processing circuit 23 is according to the first comparison voltage and second
Comparison voltage exports corresponding signal to micro-control unit 25, micro-control unit 25 is enabled to obtain intelligent power module 24
State, improve safety, prevent the internal temperature of intelligent power module 24 is excessively high from burning circuit, and overcurrent can be effectively prevent
Interference to thermal-shutdown circuit.
It is the structural schematic diagram of another embodiment of thermal-shutdown circuit provided by the present application refering to Fig. 3, Fig. 3, which protects
Protection circuit includes: the first regulating circuit 31, the first comparison circuit 32, the second regulating circuit 33, the second comparison circuit 34 and place
Manage circuit 35.
Intelligent power module 36 integrates two kinds of functions, and one is integrated thermistor (not shown)s, for monitoring
Temperature, another kind are integrated overcurrent protection (not shown), the switching tube when there is overcurrent condition, in intelligent power module 36
(not shown) can be closed, at this time voltage output end VFO (the Fault output/Temperature of intelligent power module 36
Monitor, failure output/temperature monitor) output low level, thus overcurrent condition triggers overheat protector mechanism in order to prevent,
Two predeterminated voltages are set.
First regulating circuit 31 is for providing the first predeterminated voltage to the first comparison circuit 32；First comparison circuit 32 difference
It is connect with the first regulating circuit 31, micro-control unit 37 and processing circuit 35, for comparing the first predeterminated voltage and intelligent function
The output voltage of rate module 36.When the first predeterminated voltage be greater than intelligent power module 36 output voltage when, export low level to
Processing circuit 35；When the first predeterminated voltage is less than the output voltage of intelligent power module 36, high level is exported to processing circuit
35。
Further, the first regulating circuit 31 include first resistor R1 and second resistance R2, one end of first resistor R1 with
First power supply VCC connection, the output voltage of first power supply VCC can be 5V, and the other end of first resistor R1 is respectively with second
The connection of the input terminal of one end of resistance R2 and the first comparison circuit 32, the other end ground connection of second resistance R2.
First comparison circuit 34 is first comparator A1, the non-inverting input terminal and intelligent power module 36 of first comparator A1
Voltage output end VFO connection, the inverting input terminal of first comparator A1 connect with the other end of first resistor R1, and first compares
The output end of device A1 is connect with processing circuit 35.
Second regulating circuit 33 is for providing the second predeterminated voltage to the second comparison circuit 34, the second comparison circuit 34 difference
It is connect with the second regulating circuit 33, micro-control unit 37 and processing circuit 35, for comparing the second predeterminated voltage and intelligent function
The output voltage of rate module 36.When the second predeterminated voltage be greater than intelligent power module 36 output voltage when, export high level to
Micro-control unit 37；When the second predeterminated voltage is less than the output voltage of intelligent power module 36, low level is exported to microcontroller
Unit 37.
Further, the second regulating circuit 33 include 3rd resistor R3 and the 4th resistance R4, one end of 3rd resistor R3 with
First power supply VCC connection, the other end of 3rd resistor R3 respectively with one end of the 4th resistance R4 and the second comparison circuit 34
Input terminal connection, the other end ground connection of the 4th resistance R4.
The inverting input terminal and intelligent power module 36 that second comparison circuit 34 is the second comparator A2, the second comparator A2
Voltage output end connection, the non-inverting input terminal of the second comparator A2 connect with the other end of 3rd resistor R3, the second comparator
The output end of A2 is connect with the output end of first comparator A1.
Please continue to refer to Fig. 2, processing circuit 35 further includes capacitor C and photo-coupler 351, on thermal-shutdown circuit further includes
Pull-up resistor 38 and pull down resistor 39.
One end of capacitor C is connect with the output end of first comparator A1, the other end ground connection of capacitor C；Photo-coupler 351 divides
It is not connect with first comparator A1 and micro-control unit 37, for isolated intelligent power module 36 and micro-control unit 37；Light
For coupler 351 using light as media transmission electric signal, it has good buffer action, output signal to input, output electric signal
On input signal without influence, strong antijamming capability.
First pin of photo-coupler 351 is connect with the output end of first comparator A1, the second pin of photo-coupler 351
Ground connection, the third pin of photo-coupler 351 are connect with the input terminal of micro-control unit 37, and the 4th pin of photo-coupler 351 connects
Second source VDD is met, the output voltage of second source VDD can be 3.3V.
When being greater than the voltage of inverting input terminal due to the voltage of the non-inverting input terminal of the comparator with open-drain output structure,
Comparator will not export high level, and be comparable to the conducting wire of vacant state, and only increase pull-up resistor can just export height
Level, thus one pull-up resistor 38 is set in the output end of first comparator A1.
The output end of first comparator A1 and the second comparator A2 use Floating drain, and pull-up resistor 38 compares with first respectively
Output end compared with device A1 and photo-coupler 351 connect, for control first comparator A1 and the second comparator A2 open-drain line with,
So when the output of any one comparator is low level state, line and result be exactly low level, only there are two comparator
Output when being all high level, line and result be just high level；In a specific embodiment, which includes the
Five resistance R5.
Pull down resistor 39 is connect with the output end of the output end of photo-coupler 351 and micro-control unit 37 respectively；One
In specific embodiment, which includes the 6th resistance R6.
When the internal temperature of intelligent power module 36 is greater than allowed temperature, the output voltage of intelligent power module 36 is small
In the second predeterminated voltage, first comparator A1 exports high level, and the second comparator A2 exports high level, and the of photo-coupler 351
One end is high level, and the output voltage of photo-coupler 351 is high level, so that micro-control unit 37 is according to the height electricity received
It is flat to obtain intelligent power module 36 and be in over-temperature condition.
When the internal temperature of intelligent power module 36 is less than allowed temperature, the output voltage of intelligent power module 36 is big
In the second predeterminated voltage, first comparator A1 exports high level, and the second comparator A2 exports low level, and the of photo-coupler 351
One end is low level, and the output voltage of photo-coupler 351 is low level, so that micro-control unit 37 is according to the low electricity received
It is flat to obtain intelligent power module 36 and be in normal temperature condition, i.e. normal temperature condition.
In a specific embodiment, it is assumed that the allowed temperature of intelligent power module 36 is 100 ° hereinafter, the first default electricity
Pressure is 0.5V, and the second predeterminated voltage is 3V；When the internal temperature of intelligent power module 36 is more than 100 °, due to intelligent power mould
Thermistor in block 36 is negative tempperature coefficient thermistor, and the voltage of the voltage output end VFO of intelligent power module 36 is less than
3V, first comparator A1 export high level, the second comparator A2 export high level, due to comparator have open-drain line and spy
Property, thus the input of photo-coupler 351 is high level, photo-coupler 351 exports high level, and micro-control unit 37 can be according to connecing
The voltage value received judges that whether in over-temperature condition, intelligent power mould is controlled by isolation circuit 30 for intelligent power module 36
Block 36 stops working.
When the internal temperature of intelligent power module 36 is lower than 100 °, the voltage output end VFO's of intelligent power module 36
Voltage is greater than 3V, and first comparator A1 exports high level, and the second comparator A2 exports low level, thus photo-coupler 351 exports
Low level.
When 36 overcurrent of intelligent power module, the voltage of the voltage output end VFO of intelligent power module 36 is 0V, the first ratio
Low level is exported compared with device A1, the second comparator A2 exports high level, thus photo-coupler 351 exports low level.
When 36 excess temperature of intelligent power module, thermal-shutdown circuit just exports high level, other either overcurrents or temperature
Degree is in normal range (NR), and thermal-shutdown circuit exports low level, and if not can avoid overcurrent item only with a comparator
It is interfered caused by part；When due to overcurrent thermal-shutdown circuit export low level, thus photo-coupler 351 low level is sent to it is micro-
Control unit 37 prevents that thermal-shutdown circuit is made to export high level when overcurrent, avoids interference caused by overcurrent condition.
The present embodiment is by can simply monitor intelligent power module using two comparators and ordinary optical coupler 351
36 whether excess temperature, two predeterminated voltages are set, when in order to prevent overcurrent trigger overheat protector mechanism, only triggered in excess temperature
Overheat protector mechanism, realize real-time monitoring intelligent power module 36 whether excess temperature.
It is the structural schematic diagram of one embodiment of electric machine controller provided by the present application, the electric machine controller refering to Fig. 4, Fig. 4
It include: intelligent power module 41, micro-control unit 42 and thermal-shutdown circuit 43.
Micro-control unit 42 is used for output pulse width modulated signal, to control 42 driving motor 44 of intelligent power module,
The motor 44 can be DC brushless motor, and intelligent power module 41 is converted into pair for detecting own temperature, and by temperature value
The voltage value answered is sent to thermal-shutdown circuit 43, and thermal-shutdown circuit 43 is used for the voltage value exported to intelligent power module 41
It is handled, and processing result is sent to micro-control unit 42, so that micro-control unit 42 is determining intelligent power mould
After block 41 is in over-temperature condition, stopping output pulse width modulated signal so that motor 44 is in shutdown status prevents temperature
The excessively high damage to circuit devcie；Wherein, thermal-shutdown circuit 43 is the thermal-shutdown circuit in above-described embodiment.
It is to be appreciated that isolation circuit 46 is provided between intelligent power module 41 and micro-control unit 42, microcontroller list
Member 42 can control the working condition of intelligent power module 41 by isolation circuit 46, so that intelligent power module 41 was in
When temperature state, it is in shutdown status.
With continued reference to Fig. 4, which further includes over-current detection circuit 45, over-current detection circuit 45 respectively with intelligence
Power module 41 and micro-control unit 42 connect, and whether the electric current for detecting intelligent power module 41 is greater than predetermined current,
And it will test result and be sent to micro-control unit 42.
Over-current detection circuit 45 includes the comparison circuit 451 and photo-coupler 452 interconnected, in a specific embodiment
In, comparison circuit 451 is comparator, and non-inverting input terminal is connect with the output end of intelligent power module 41, anti-phase input termination
Receive predeterminated voltage；When 41 overcurrent of intelligent power module, the voltage of the non-inverting input terminal of comparator is less than the electricity of inverting input terminal
Pressure, photo-coupler 452 export low level；When the temperature of intelligent power module 41 is in normal range (NR), intelligent power module
41 output high level, the voltage of the non-inverting input terminal of comparator are greater than the voltage of inverting input terminal, and photo-coupler 452 exports high electricity
It is flat.
Thus intelligent power mould can be judged according to the output result of thermal-shutdown circuit 43 and over-current detection circuit 45
The state of block 41；When thermal-shutdown circuit 43 exports high level, intelligent power module 41 is in over-temperature condition, if over-current detection
Circuit 45 exports low level, then intelligent power module 41 is also in over-current state；When thermal-shutdown circuit 43 exports low level,
If over-current detection circuit 45 exports low level, for intelligent power module 41 also in over-current state, temperature is normal, if over-current detection
Circuit 45 export high level, then the temperature of intelligent power module 41 be within normal range (NR) or electric current be in normal range (NR) with
It is interior.
The working condition that intelligent power module 41 is detected using thermal-shutdown circuit 43 and over-current detection circuit 45, in intelligence
Energy power module 41 is when in an abnormal state, and micro-control unit 42 makes a response in time, stops output pulse width modulated signal,
So that motor 44 is in shutdown status, the damage of circuit devcie is prevented.
The above is only embodiments herein, are not intended to limit the scope of the patents of the application, all to be said using the application
Equivalent structure or equivalent flow shift made by bright book and accompanying drawing content is applied directly or indirectly in other relevant technology necks
Domain similarly includes in the scope of patent protection of the application.
Claims (10)
1. a kind of thermal-shutdown circuit characterized by comprising
It is default to provide first for anti-clutter circuit, the voltage triggered overheat protector exported when for preventing intelligent power module overcurrent
Voltage, and the output voltage of first predeterminated voltage and the intelligent power module export the first comparison voltage to place
Manage circuit, wherein first predeterminated voltage is greater than output voltage of the intelligent power module in overcurrent；
Comparison control circuit, for providing the second predeterminated voltage, and second predeterminated voltage and the intelligent power mould
The output voltage of block exports the second comparison voltage to the processing circuit；
Processing circuit is connect with the anti-clutter circuit and the comparison control circuit respectively, for comparing according to described first
Compared with voltage and second comparison voltage, corresponding signal is exported to micro-control unit, so that the micro-control unit obtains
Over-temperature condition is in the corresponding state of output voltage of the intelligent power module, and determining the intelligent power module
When control the intelligent power module and be in off working state；
Wherein, second predeterminated voltage by the intelligent power module permission temperature the corresponding voltage value of the upper limit, institute
The first predeterminated voltage is stated less than second predeterminated voltage.
2. thermal-shutdown circuit according to claim 1, which is characterized in that
The anti-clutter circuit includes the first regulating circuit and the first comparison circuit, and first regulating circuit is used to provide the described
First predeterminated voltage gives first comparison circuit；First comparison circuit respectively with first regulating circuit, described micro-
Control unit and processing circuit connection, the output for second predeterminated voltage and the intelligent power module
Voltage exports low level to the processing when second predeterminated voltage is greater than the output voltage of the intelligent power module
Circuit exports high level to the processing when second predeterminated voltage is less than the output voltage of the intelligent power module
Circuit；The comparison control circuit includes the second regulating circuit and the second comparison circuit, and second regulating circuit is for providing
Second predeterminated voltage give second comparison circuit, second comparison circuit respectively with second regulating circuit, institute
Micro-control unit and processing circuit connection are stated, for first predeterminated voltage and the intelligent power module
Output voltage, when first predeterminated voltage be greater than the intelligent power module output voltage when, export the high level to
The processing circuit exports the low electricity when first predeterminated voltage is less than the output voltage of the intelligent power module
It puts down to the processing circuit.
3. thermal-shutdown circuit according to claim 2, which is characterized in that
First regulating circuit includes first resistor and second resistance, and one end of the first resistor is connect with the first power supply,
The other end of the first resistor is connect with the input terminal of one end of the second resistance and first comparison circuit respectively,
The other end of the second resistance is grounded；Second regulating circuit includes 3rd resistor and the 4th resistance, the 3rd resistor
One end connect with first power supply, the other end of the 3rd resistor respectively with one end of the 4th resistance and described
The input terminal of second comparison circuit connects, the other end ground connection of the 4th resistance.
4. thermal-shutdown circuit according to claim 3, which is characterized in that
First comparison circuit is first comparator, the non-inverting input terminal of the first comparator and the intelligent power module
Voltage output end connection, the inverting input terminal of the first comparator connect with the other end of the first resistor, described the
The output end of one comparator is connect with the processing circuit；Second comparison circuit is the second comparator, and described second compares
The inverting input terminal of device is connect with the voltage output end of the intelligent power module, the non-inverting input terminal of second comparator with
The other end of the 3rd resistor connects, and the output end of second comparator is connect with the output end of the first comparator.
5. thermal-shutdown circuit according to claim 4, which is characterized in that
The processing circuit includes capacitor and photo-coupler, the output end company of one end of the capacitor and the first comparator
Connect, the other end of the capacitor and ground connection, the photo-coupler respectively with the first comparator and the micro-control unit
Connection, for the intelligent power module and the micro-control unit to be isolated.
6. thermal-shutdown circuit according to claim 5, which is characterized in that
First pin of the photo-coupler is connect with the output end of the first comparator, the second pin of the photo-coupler
Ground connection, the third pin of the photo-coupler are connect with the input terminal of the micro-control unit, the 4th pipe of the photo-coupler
Foot connects second source.
7. thermal-shutdown circuit according to claim 5, which is characterized in that
The thermal-shutdown circuit further includes pull-up resistor, the pull-up resistor respectively with the first comparator and described second
The output end of the output end of comparator and photo-coupler connection, the first comparator and second comparator uses
Floating drain.
8. thermal-shutdown circuit according to claim 5, which is characterized in that
The thermal-shutdown circuit further includes pull down resistor, the pull down resistor respectively with the output end of the photo-coupler and
The input terminal of the micro-control unit connects.
9. thermal-shutdown circuit according to claim 5, which is characterized in that
When the internal temperature of the intelligent power module is greater than the allowed temperature, the output electricity of the intelligent power module
Pressure is less than second predeterminated voltage, and the first comparator exports high level, and second comparator exports high level, described
The output voltage of photo-coupler is high level, so that described in the micro-control unit obtains according to the high level received
Intelligent power module is in the over-temperature condition；
When the internal temperature of the intelligent power module is less than the allowed temperature, the output electricity of the intelligent power module
Pressure is greater than second predeterminated voltage, and second comparator exports low level, and the output voltage of the photo-coupler is low electricity
It is flat, so that the micro-control unit, which obtains the intelligent power module according to the low level received, is in normal temperature
State.
10. a kind of electric machine controller characterized by comprising intelligent power module, micro-control unit and overheat protector electricity
Road, the micro-control unit is used for output pulse width modulated signal, described to control the intelligent power module driving motor
Temperature value is converted into corresponding voltage value and is sent to the overheat protector electricity by intelligent power module for detecting own temperature
Road, the voltage value that the thermal-shutdown circuit is used to export the intelligent power module is handled, and processing result is sent out
It send to the micro-control unit, so that the micro-control unit is in over-temperature condition determining the intelligent power module
Afterwards, stop exporting the pulse width modulating signal, so that the motor is in shutdown status；Wherein, the overheat protector
Circuit is thermal-shutdown circuit of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811593766.XA CN109802527B (en) | 2018-12-25 | 2018-12-25 | Over-temperature protection circuit and motor controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811593766.XA CN109802527B (en) | 2018-12-25 | 2018-12-25 | Over-temperature protection circuit and motor controller |
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| CN109802527A true CN109802527A (en) | 2019-05-24 |
| CN109802527B CN109802527B (en) | 2020-06-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110364995A (en) * | 2019-08-07 | 2019-10-22 | 珠海格力电器股份有限公司 | IPM module FO output protection circuit and method |
| CN114132193A (en) * | 2021-11-30 | 2022-03-04 | 长春捷翼汽车零部件有限公司 | New energy electronic lock, feedback control circuit and feedback control method thereof and new energy automobile |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110364995A (en) * | 2019-08-07 | 2019-10-22 | 珠海格力电器股份有限公司 | IPM module FO output protection circuit and method |
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