CN108306261A - Intelligent power module guard method, circuit, readable storage medium storing program for executing and air conditioner - Google Patents
Intelligent power module guard method, circuit, readable storage medium storing program for executing and air conditioner Download PDFInfo
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- CN108306261A CN108306261A CN201810104647.7A CN201810104647A CN108306261A CN 108306261 A CN108306261 A CN 108306261A CN 201810104647 A CN201810104647 A CN 201810104647A CN 108306261 A CN108306261 A CN 108306261A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000013507 mapping Methods 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 32
- 230000005611 electricity Effects 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
Abstract
The invention discloses a kind of intelligent power module guard method, circuit, readable storage medium storing program for executing and air conditioner, which includes the following steps：The sampled voltage of three bridge output ends under intelligent power module is obtained, and obtains the current operating temperature of intelligent power module；According to the mapping relations that the operating temperature of the current operating temperature and preset intelligent power module and default overcurrent are held time, determine that the overcurrent of intelligent power module under current operating temperature is held time；When the duration that sampled voltage is more than predetermined voltage threshold is held time more than or equal to the overcurrent of intelligent power module under current operating temperature, overcurrent protection is executed to intelligent power module, control intelligent power module is stopped.Present invention greatly enhances the reliabilities to intelligent power module overcurrent protection.
Description
Technical field
The present invention relates to intelligent power module field more particularly to a kind of intelligent power module guard methods, circuit, readable
Storage medium and air conditioner.
Background technology
In the prior art, it typically being adopted by monitoring the voltage sampling circuit of the lower three bridges output end of intelligent power module
Sample voltage realizes the overcurrent protection function to intelligent power module, specifically, sets protection voltage to fixed voltage threshold,
After the sampled voltage of the voltage sampling circuit is more than the fixed voltage threshold and maintains a period of time t, intelligent power is executed
The overcurrent protection of module acts, and control intelligent power module is stopped, and the overcurrent protection scheme of intelligent power module is also referred to as
For one-part form over-current protection method.
However, the conveyance capacity that the IGBT pipes inside intelligent power module can bear is influenced by operating ambient temperature, when
When operating ambient temperature is relatively low, the conveyance capacity that IGBT pipes can bear is strong, when operating ambient temperature is higher, IGBT pipes institute energy
The conveyance capacity born is weaker, therefore, for the changeable application scenario of operating ambient temperature, using above-mentioned one-part form overcurrent protection
Scheme obviously not can be well protected intelligent power module, i.e., in the prior art the overcurrent protection scheme of intelligent power module can
It is relatively low by property.
Invention content
The main purpose of the present invention is to provide a kind of intelligent power module guard methods, it is intended to improve to intelligent power mould
The reliability of block overcurrent protection.
To achieve the goals above, the present invention provides a kind of intelligent power module guard method, the intelligent power module
Guard method includes the following steps：
S10 obtains the sampled voltage of three bridge output ends under intelligent power module, and obtains the current of intelligent power module
Operating temperature；
S20 is tieed up according to the operating temperature of the current operating temperature and preset intelligent power module and default overcurrent
The mapping relations for holding the time determine that the overcurrent of intelligent power module under current operating temperature is held time；
S30, when the duration that the sampled voltage is more than predetermined voltage threshold is greater than or equal to the work at present temperature
When the overcurrent of the lower intelligent power module of degree is held time, overcurrent protection is executed to the intelligent power module, controls the intelligence
Power module is stopped.
Preferably, the predetermined voltage threshold is greater than or equal to 2V.
In addition, to achieve the above object, the present invention also provides a kind of intelligent power module to protect circuit, the intelligent power
Module protection circuit includes temperature sampling circuit, voltage sampling circuit, voltage comparator circuit, delay circuit, microcontroller and deposits
Store up the overcurrent protection program for the intelligent power module that can be run in the microcontroller and on the microcontroller；Wherein：
The temperature sampling circuit is sampled for the current operating temperature to intelligent power module；
The voltage sampling circuit, the electric current for the lower three bridges output end to intelligent power module sample, and will
The electric current sampled is converted to sampled voltage；
The voltage comparator circuit, for being compared to the sampled voltage and predetermined voltage threshold；
The delay circuit, the overcurrent for generating intelligent power module under current operating temperature are held time；
The overcurrent protection program of the intelligent power module realizes following steps when being executed by the microcontroller：
S10 obtains the sampled voltage of three bridge output ends under intelligent power module, and obtains the current of intelligent power module
Operating temperature；
S20 is tieed up according to the operating temperature of the current operating temperature and preset intelligent power module and default overcurrent
The mapping relations for holding the time determine that the overcurrent of intelligent power module under current operating temperature is held time；
S30, when the duration that the sampled voltage is more than predetermined voltage threshold is greater than or equal to the work at present temperature
When the overcurrent of the lower intelligent power module of degree is held time, overcurrent protection is executed to the intelligent power module, controls the intelligence
Power module is stopped.
Preferably, the predetermined voltage threshold is greater than or equal to 2V.
Preferably, the temperature sampling circuit is connect with the I/O port of the microcontroller；The voltage sampling circuit includes the
One resistance, the first end of the first resistor is respectively compared with the lower three bridges output end of the intelligent power module and the voltage
Circuit connects, the second end ground connection of the first resistor.
Preferably, the voltage comparator circuit includes operating voltage input terminal, voltage comparator, second resistance and default electricity
Press threshold generation circuits unit；Wherein：
The in-phase input end of the voltage comparator and the first end of first resistor described in the voltage sampling circuit connect
It connects, the inverting input of the voltage comparator is connect with the output end of the predetermined voltage threshold generation circuit unit, described
The output end of voltage comparator is connect with the interrupt pin of the first end of the second resistance and the microcontroller respectively, and described
The second end of two resistance is connect with the operating voltage input terminal.
Preferably, the predetermined voltage threshold generation circuit unit includes 3rd resistor, the 4th resistance and work electricity
Press input terminal；Wherein：
The first end of the 3rd resistor is connect with the operating voltage input terminal, and the second end of the 3rd resistor is institute
State the output end of predetermined voltage threshold generation circuit unit, the second end of the 3rd resistor respectively with the voltage comparator
The first end of inverting input and the 4th resistance connects, the second end ground connection of the 4th resistance.
Preferably, the delay circuit includes the 5th resistance, multiple capacitances and corresponding multiple with multiple capacitances
Electronic switch；Wherein：
Interruption of the first end of 5th resistance respectively with the output end of the voltage comparator and the microcontroller is drawn
Foot connects, and the second end of the 5th resistance is connect with the first end of each electronic switch respectively, each electronic switch
Second end is respectively connect with the first end of a capacitance, and the second end of each capacitance is grounded, each electronic switch
Control terminal respectively corresponding to the microcontroller I/O port connection.
In addition, to achieve the above object, the present invention also provides a kind of readable storage medium storing program for executing, being deposited on the readable storage medium storing program for executing
The overcurrent protection program for containing intelligent power module, it is real when the overcurrent protection program of the intelligent power module is executed by microcontroller
Now intelligent power module guard method as described above.
In addition, to achieve the above object, the present invention also provides a kind of air conditioner, the air conditioner includes intelligent power module
It is that intelligent power module as described above protects circuit to protect circuit, the intelligent power module protection circuit.
The present invention provides a kind of intelligent power module guard method, and the intelligent power module guard method includes following step
Suddenly：S10 obtains the sampled voltage of three bridge output ends under intelligent power module, and obtains the work at present of intelligent power module
Temperature；S20, when being maintained according to the operating temperature of the current operating temperature and preset intelligent power module and default overcurrent
Between mapping relations, determine that the overcurrent of intelligent power module under current operating temperature is held time；S30, when the sampled voltage
The overcurrent for being greater than or equal to intelligent power module under the current operating temperature more than the duration of predetermined voltage threshold maintains
When the time, overcurrent protection is executed to the intelligent power module, the intelligent power module is controlled and is stopped.Present invention intelligence
Power module guard method by thus according to intelligent power module current operating temperature and preset intelligent power module
The mapping relations that operating temperature is held time with default overcurrent determine that the overcurrent of intelligent power module under current operating temperature maintains
Time, i.e., when the operating temperature difference of intelligent power module, used overcurrent is held time difference, i.e. the intelligent work(of the present invention
Rate module protection method realizes the multisection type overcurrent protection to intelligent power module, the present invention compared with the existing technology in one
Segmentation over-current protection method greatly improves the reliability to intelligent power module overcurrent protection.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the flow diagram of one embodiment of intelligent power module guard method of the present invention；
Fig. 2 is the work of preset intelligent power module described in one embodiment of intelligent power module guard method of the present invention
The mapping relations schematic diagram that temperature is held time with default overcurrent；
Fig. 3 is the high-level schematic functional block diagram that intelligent power module of the present invention protects one embodiment of circuit；
Fig. 4 is the structural schematic diagram that intelligent power module of the present invention protects one embodiment of circuit.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of intelligent power module guard method, for solving the existing one-part form to intelligent power module
The relatively low problem of over-current protection method reliability.
Referring to Fig.1, in one embodiment, which includes the following steps：
S10 obtains the sampled voltage of three bridge output ends under intelligent power module, and obtains the current of intelligent power module
Operating temperature；
Specifically, the guard method of the present embodiment intelligent power module is to obtain three bridge output ends under intelligent power module first
Sampled voltage, and obtain intelligent power module current operating temperature.The overcurrent that can bear due to intelligent power module
Ability is influenced by operating temperature, and the conveyance capacity that it can bear when operating temperature is relatively low is strong, its energy when operating temperature is higher
The conveyance capacity born is weaker, therefore, the present embodiment intelligent power module guard method, three bridges in the case where obtaining intelligent power module
While the sampled voltage of output end, the current operating temperature of intelligent power module is also obtained, then executes step S20.
S20 is tieed up according to the operating temperature of the current operating temperature and preset intelligent power module and default overcurrent
The mapping relations for holding the time determine that the overcurrent of intelligent power module under current operating temperature is held time；
It is understood that the mapping relations that the operating temperature of the intelligent power module is held time with default overcurrent can
To be set according to actual conditions, it is preferable that according to the working characteristics of IGBT pipes inside the intelligent power module, this implementation
Example is arranged longer overcurrent in low-temperature space and holds time, to improve the reliability of the overcurrent protection action to intelligent power module,
The present embodiment is arranged shorter overcurrent in high-temperature region and holds time, to ensure the fast of the overcurrent protection action to intelligent power module
Speed response.Also, the overcurrent that the present embodiment is chosen in low-temperature space hold time it is sparse, and high-temperature region choose overcurrent maintain
Time with respect to comparatively dense, using the selection mode can save hardware resource and make intelligent power module operating temperature compared with
It is adequately protected when high.Specifically, Fig. 2 is preset described in one embodiment of intelligent power module guard method of the present invention
The mapping relations schematic diagram that the operating temperature of intelligent power module and default overcurrent are held time, with reference to Fig. 2, in the present embodiment,
When the work temperature of the intelligent power module is less than or equal to 20 DEG C, the corresponding default overcurrent t1 that holds time is
20ms, the corresponding default overcurrent when the work temperature of the intelligent power module is more than 20 DEG C and is less than or equal to 40 DEG C
The t2 that holds time is 10ms, and when the work temperature of the intelligent power module is more than 40 DEG C and is less than or equal to 55 DEG C, institute is right
The default overcurrent answered holds time t3 for 5ms, when the work temperature of the intelligent power module is more than 55 DEG C and is less than or equal to
Corresponding default overcurrent holds time t4 as 2.5ms at 65 DEG C.Assuming that the institute accessed by step S10 described in the present embodiment
State intelligent power module current operating temperature T be 37 DEG C, then as can be seen from FIG. 2, the intelligent power module 37 DEG C when institute
Corresponding default overcurrent holds time t as 10ms, you can to determine the overcurrent of the intelligent power module under current operating temperature
The t that holds time is 10ms.
S30, when the duration that the sampled voltage is more than predetermined voltage threshold is greater than or equal to the work at present temperature
When the overcurrent of the lower intelligent power module of degree is held time, overcurrent protection is executed to the intelligent power module, controls the intelligence
Power module is stopped.
Specifically, in the present embodiment, when the sampled voltage of three bridge output ends under the intelligent power module got is more than in advance
If when voltage threshold, and the sampled voltage is more than the duration of predetermined voltage threshold more than or equal to the work at present temperature
When the overcurrent of the lower intelligent power module of degree is held time, overcurrent protection is executed to the intelligent power module, controls the intelligence
Power module is stopped.
It is understood that above-mentioned predetermined voltage threshold can be set according to actual conditions, it is preferable that the present embodiment
In, the predetermined voltage threshold is greater than or equal to 2V.Assuming that the intelligent power module accessed by the present embodiment is current
Operating temperature be 37 DEG C (i.e. under current operating temperature the overcurrent of the intelligent power module hold time t be 10ms), and obtain
The sampled voltage of three bridge output ends is more than 2V under the intelligent power module arrived, and the sampled voltage is big more than the duration of 2V
In or be equal to 10ms, then the present embodiment to the intelligent power module execute overcurrent protection, control the intelligent power module and stop
Only work.
The guard method of the present embodiment intelligent power module by thus according to intelligent power module current operating temperature and
The mapping relations that the operating temperature of preset intelligent power module is held time with default overcurrent, determine intelligence under current operating temperature
The overcurrent of energy power module is held time, i.e., when the operating temperature difference of intelligent power module, used overcurrent is held time
Difference, the i.e. guard method of the present embodiment intelligent power module realize the multisection type overcurrent protection to intelligent power module, this reality
One-part form over-current protection method in applying example compared with the existing technology, greatly improves to intelligent power module overcurrent protection
Reliability；Also, the guard method of the present embodiment intelligent power module is arranged longer overcurrent in low-temperature space and holds time, and improves
To the reliability of the overcurrent protection action of intelligent power module, the present embodiment is arranged shorter overcurrent in high-temperature region and holds time,
Ensure the quick response of the overcurrent protection action to intelligent power module；Meanwhile the overcurrent that the present embodiment is chosen in low-temperature space
It holds time sparse, and in high-temperature region, the overcurrent of selection is held time with respect to comparatively dense, can be saved using the selection mode
Hardware resource, and intelligent power module can be made adequately to be protected when operating temperature is higher.
It is that intelligent power module of the present invention protects circuit to protect circuit, Fig. 3 the present invention also provides a kind of intelligent power module
The high-level schematic functional block diagram of one embodiment, with reference to Fig. 3, in the present embodiment, it includes temperature which, which protects circuit 100,
Sample circuit 101, voltage sampling circuit 102, voltage comparator circuit 103, delay circuit 104, microcontroller 105 and it is stored in institute
State the overcurrent protection program for the intelligent power module that can be run in microcontroller 105 and on the microcontroller 105.
Specifically, the temperature sampling circuit 101 is adopted for the current operating temperature to intelligent power module 200
Sample；
The voltage sampling circuit 102, the electric current for the lower three bridges output end to intelligent power module 200 are adopted
Sample, and the electric current sampled is converted into sampled voltage, and the sampled voltage is exported to the voltage comparator circuit
103；
The voltage comparator circuit 103, for being compared to the sampled voltage and predetermined voltage threshold that receive；
The delay circuit 104, the overcurrent for generating intelligent power module under current operating temperature are held time；
In the present embodiment, realized such as when the overcurrent protection program of the intelligent power module is executed by the microcontroller 105
The step of intelligent power module guard method described in above-described embodiment, details are not described herein again.
In the present embodiment, the temperature sampling circuit 101 is connect with the microcontroller 105, the voltage sampling circuit 102
Sampling input terminal connect with the lower three bridges output end (label not shown) of the intelligent power module 200, the voltage sample
The sampled output of circuit 102 is connect with the voltage comparator circuit 103, the delay circuit 104 respectively with the voltage ratio
It is connected compared with circuit 103 and the microcontroller 105.
Fig. 4 is the structural schematic diagram that intelligent power module of the present invention protects one embodiment of circuit, together reference Fig. 3 and Fig. 4,
In the present embodiment, the temperature sampling circuit 101 is connect with the I/O port (label not shown) of the microcontroller 105.
In the present embodiment, the voltage sampling circuit 102 includes the first end point of first resistor R1, the first resistor R1
Not with the lower three bridges output end of the intelligent power module 200 (i.e. the end NW, NV and NU of the intelligent power module 200) and institute
The connection of voltage comparator circuit 103 is stated, the second end of the first resistor R1 is grounded GND.
In the present embodiment, the voltage comparator circuit 103 includes operating voltage input terminal VCC, voltage comparator U1, second
Resistance R2 and predetermined voltage threshold generation circuit unit 1031.It is understood that the voltage comparator U1 can be single electricity
Press comparator, or twin voltage comparator, in the present embodiment, the voltage comparator U1 is twin voltage comparator.Specifically
Ground, the of the inverting input 2IN- of the voltage comparator U1 and first resistor R1 described in the voltage sampling circuit 102
One end connects, the in-phase input end 2IN+ of the voltage comparator U1 and the predetermined voltage threshold generation circuit unit 1031
Output end connects, the output end of the voltage comparator U1 respectively with the first end of the second resistance R2 and the microcontroller
105 interrupt pin INT connections, the second end of the second resistance R2 are connect with the operating voltage input terminal VCC.
In the present embodiment, the predetermined voltage threshold generation circuit unit 1031 includes 3rd resistor R3, the 4th resistance R4
And the operating voltage input terminal VCC.Specifically, the first end of the 3rd resistor R3 and the operating voltage input terminal VCC
Connection, the second end of the 3rd resistor R3 are the output end of the predetermined voltage threshold generation circuit unit 1031, described the
The second end of three resistance R3 respectively with the in-phase input end 2IN+ of the voltage comparator U1 and the 4th resistance R4 first
The second end of end connection, the 4th resistance R4 is grounded GND.
In the present embodiment, the delay circuit 104 includes the 5th resistance R5, multiple capacitances and opposite with multiple capacitances
The multiple electronic switches answered, wherein multiple capacitances are respectively capacitance C1, capacitance C2...... and capacitance Cn, multiple electronic switches
Respectively electronic switch K1, electronic switch K2...... and electronic switch Kn, in the present embodiment, the number of the capacitance with it is described
The number of electronic switch is equal.Specifically, in the present embodiment, the first end of the 5th resistance R5 is respectively compared with the voltage
The interrupt pin INT connections of the output end 2OUT and the microcontroller 105 of device U1, the second end of the 5th resistance R5 respectively with
The first end of each electronic switch connects, (second end of the i.e. described 5th resistance R5 respectively with the electronic switch K1 the
The first end of one end, the first end ... of the electronic switch K2 and the electronic switch Kn connects), each electronic switch
Second end respectively connect that (second end of the i.e. described electronic switch K1 is with the capacitance C1's with the first end of a capacitance
First end connects, and the second end of the electronic switch K2 is connect with the first end of the capacitance C2 ..., the electronic switch
The second end of Kn is connect with the first end of the capacitance Cn), the second end of each capacitance is grounded GND (the i.e. described capacitance C1
Second end, the second end of the second end ... of the capacitance C2 and the capacitance Cn be grounded GND)；In the present embodiment, respectively
The respectively I/O port connection corresponding to the microcontroller 105 of the control terminal of the electronic switch, i.e., the control of the described electronic switch K1
The control terminal at end processed, the control terminal ... of the electronic switch K2 and the electronic switch Kn respectively with the microcontroller
105 corresponding I/O port connection (specific connection relation not shown).It is understood that in the present embodiment, the number n of the capacitance
(namely the number n) of the electronic switch is integer, the value of n can be set according to actual conditions, and the present embodiment is root
It is determined according to the quantity that the default overcurrent is held time.
The operation principle of the present embodiment intelligent power module protection circuit 100 is described in detail below：The 5th resistance R5
The first RC circuits are constituted with the capacitance C1, the 5th resistance R5 and capacitance C2 constitutes the 2nd RC circuits ..., institute
It states the 5th resistance R5 and capacitance Cn and constitutes the n-th RC circuits, the discharge time of above-mentioned each RC circuits corresponds to an overcurrent and maintains
Time.Specifically, in the present embodiment, the intelligence that the microcontroller 105 is sampled according to the temperature sampling circuit 101
The current operating temperature of power module 200 exports corresponding electronic cutting in corresponding switch control signal to the delay circuit 104
The control terminal of pass, to control the break-make of corresponding electronic switch, so that the delay circuit 104 generates current operating temperature institute
Corresponding overcurrent hold time namely the present embodiment in the delay circuit 104 caused by intelligence under current operating temperature
The overcurrent of power module is held time to be controlled by the microcontroller 105.
It should be noted that in the present embodiment, it is preset in the present embodiment in order to avoid electronic switch persistent switch acts
The operating temperature of intelligent power module is staged mapping relations with the mapping relations that default overcurrent is held time, it is possible to understand that
It is that the mapping relations that the operating temperature of the intelligent power module is held time with default overcurrent can be carried out according to actual conditions
Setting, it is preferable that according to the working characteristics of IGBT pipes inside the intelligent power module, the present embodiment is arranged longer in low-temperature space
Overcurrent hold time, to improve the reliability to the overcurrent protection of intelligent power module action, the present embodiment is set in high-temperature region
It sets shorter overcurrent to hold time, to ensure the quick response of the overcurrent protection action to intelligent power module.Also, this implementation
The overcurrent that example is chosen in low-temperature space is held time sparse, and the overcurrent chosen in high-temperature region is held time opposite comparatively dense, is adopted
Hardware resource can be saved with the selection mode and intelligent power module is made adequately to be protected when operating temperature is higher
Shield.Specifically, Fig. 2 is the work of preset intelligent power module described in one embodiment of intelligent power module guard method of the present invention
Make the mapping relations schematic diagram that temperature and default overcurrent are held time, with reference to Fig. 2, in the present embodiment, when the intelligent power mould
The work temperature of block default overcurrent corresponding when being less than or equal to 20 DEG C holds time t1 for 20ms, when the intelligent power
The work temperature of module is more than 20 DEG C and the corresponding default overcurrent t2 that holds time is 10ms when less than or equal to 40 DEG C, when
The work temperature of the intelligent power module default overcurrent corresponding when being more than 40 DEG C and being less than or equal to 55 DEG C is held time
T3 is 5ms, corresponding when the work temperature of the intelligent power module is more than 55 DEG C and is less than or equal to 65 DEG C to preset
Stream holds time t4 as 2.5ms.Assuming that the intelligent power module accessed by step S10 described in the present embodiment is current
Work temperature is 37 DEG C, then as can be seen from FIG. 2, when the intelligent power module default overcurrent corresponding at 37 DEG C maintains
Between t be 10ms, you can to determine that the overcurrent of the intelligent power module under current operating temperature holds time t as 10ms.
Specifically, in the present embodiment, when sampled voltage Ur (i.e. described first electricity that the voltage sampling circuit 102 exports
Hinder R1 and the voltage at the link node of the intelligent power module 200) it is less than or equal to predetermined voltage threshold generation circuit list
Predetermined voltage threshold Uref (the predetermined voltage threshold Uref, that is, 3rd resistor R3 and the described 4th caused by member 1031
The voltage of link node between resistance R4) when, i.e. when Ur≤Uref, the high electricity of output end 2OUT outputs of the voltage comparator U1
Flat, the microcontroller 105 is without response, i.e., the microcontroller 105 does not execute overcurrent protection to the intelligent power module 200, institute
State the normal work of intelligent power module 200；
When the sampled voltage Ur that the voltage sampling circuit 102 exports is more than the predetermined voltage threshold generation circuit unit
Caused by 1031 when predetermined voltage threshold Uref, i.e. Ur>When Uref, due to the voltage comparator U1 output end 2OUT with
Ground GND is connected, at this point, due to the presence of RC circuits in the delay circuit 104, the output end 2OUT of the voltage comparator U1
Voltage can not be pulled low at once so that the microcontroller 105 is not responding to, the intelligent power module 200 is still normal
Work；When the sampled voltage Ur that the voltage sampling circuit 102 exports is more than the duration of the predetermined voltage threshold Uref
When overcurrent more than or equal to intelligent power module under current operating temperature 200 is held time, the voltage comparator U1's is defeated
The voltage of outlet 2OUT is pulled low to low potential, i.e., the interrupt pin INT of the microcontroller 105 at this time is low level, described
When microcontroller 105 detects that its interrupt pin INT is low level, institute's microcontroller 105 executed the intelligent power module 200
Stream protection, controls the intelligent power module 200 and is stopped.Assuming that temperature sampling circuit 101 described in the present embodiment is adopted
The current operating temperature for the intelligent power module that sample arrives is 37 DEG C, and the intelligence that the voltage sampling circuit 102 is sampled
The sampled voltage of energy 200 times three bridge output ends of power module is more than 2V, and duration of the sampled voltage more than 2V is more than
Or when equal to 10ms, the microcontroller 105 can detect that its interrupt pin INT is low level, when the microcontroller 105 detects
When its interrupt pin INT is low level, the microcontroller 105 executes overcurrent protection to the intelligent power module 200, controls institute
Intelligent power module 200 is stated to be stopped.
In addition, it is necessary to explanation, if in overcurrent is held time, the institute that the voltage sampling circuit 102 samples
Sampled voltage Ur recoveries to less than the state of the predetermined voltage threshold Uref are stated, then the electricity of the operating voltage input terminal VCC
Pressure is by the second resistance R2 and the 5th resistance R5 to corresponding capacitor charging in the delay circuit 104 so that institute
The output end 2OUT for stating voltage comparator U1 is high level, so that the microcontroller 105 is without response, so that the list
Piece machine 105 does not execute overcurrent protection to the intelligent power module 200, and the intelligent power module 200 keeps normal work.
The present embodiment intelligent power module protect circuit, by thus according to intelligent power module current operating temperature and
The mapping relations that the operating temperature of preset intelligent power module is held time with default overcurrent, determine intelligence under current operating temperature
The overcurrent of energy power module is held time, i.e., when the operating temperature difference of intelligent power module, used overcurrent is held time
Difference, i.e. the present embodiment intelligent power module protection circuit realize the multisection type overcurrent protection to intelligent power module, this reality
One-part form overcurrent protection scheme in applying example compared with the existing technology, greatly improves to intelligent power module overcurrent protection
Reliability；Also, the present embodiment is arranged longer overcurrent in low-temperature space and holds time, and improves to intelligent power module 200
The reliability of overcurrent protection action is arranged shorter overcurrent in high-temperature region and holds time, it is ensured that intelligent power module 200
The quick response of overcurrent protection action；Meanwhile the overcurrent chosen in low-temperature space of the present embodiment hold time it is sparse, and in high temperature
The overcurrent that area chooses is held time with respect to comparatively dense, can be saved hardware resource using the selection mode and be made intelligent power
Module is adequately protected when operating temperature is higher.
The present invention also provides a kind of readable storage medium storing program for executing, intelligent power module is stored on the readable storage medium storing program for executing
Overcurrent protection program realizes following operation when the overcurrent protection program of the intelligent power module is executed by microcontroller：
S10 obtains the sampled voltage of three bridge output ends under intelligent power module, and obtains the current of intelligent power module
Operating temperature；
S20 is tieed up according to the operating temperature of the current operating temperature and preset intelligent power module and default overcurrent
The mapping relations for holding the time determine that the overcurrent of intelligent power module under current operating temperature is held time；
S30, when the duration that the sampled voltage is more than predetermined voltage threshold is greater than or equal to the work at present temperature
When the overcurrent of the lower intelligent power module of degree is held time, overcurrent protection is executed to the intelligent power module, controls the intelligence
Power module is stopped.
It is understood that above-mentioned predetermined voltage threshold can be set according to actual conditions, it is preferable that described default
Voltage threshold is greater than or equal to 2V.
The present invention also provides a kind of air conditioner, which includes intelligent power module protection circuit, the intelligent power
The structure and working principle of module protection circuit can refer to above-described embodiment, and details are not described herein.Naturally, due to this reality
The air conditioner for applying example uses the technical solution of above-mentioned intelligent power module protection circuit, therefore the air conditioner has above-mentioned intelligence
The advantageous effect that power module protects circuit all.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of intelligent power module guard method, which is characterized in that the intelligent power module guard method includes following step
Suddenly：
S10 obtains the sampled voltage of three bridge output ends under intelligent power module, and obtains the work at present of intelligent power module
Temperature；
S20, when being maintained according to the operating temperature of the current operating temperature and preset intelligent power module and default overcurrent
Between mapping relations, determine that the overcurrent of intelligent power module under current operating temperature is held time；
S30, when the duration that the sampled voltage is more than predetermined voltage threshold is greater than or equal under the current operating temperature
When the overcurrent of intelligent power module is held time, overcurrent protection is executed to the intelligent power module, controls the intelligent power
Module from service.
2. intelligent power module guard method as described in claim 1, which is characterized in that the predetermined voltage threshold be more than or
Equal to 2V.
3. a kind of intelligent power module protects circuit, which is characterized in that the intelligent power module protection circuit includes that temperature is adopted
It sample circuit, voltage sampling circuit, voltage comparator circuit, delay circuit, microcontroller and is stored in the microcontroller and can be
The overcurrent protection program of the intelligent power module run on the microcontroller；Wherein：
The temperature sampling circuit is sampled for the current operating temperature to intelligent power module；
The voltage sampling circuit, the electric current for the lower three bridges output end to intelligent power module sample, and will sampling
To the electric current be converted to sampled voltage；
The voltage comparator circuit, for being compared to the sampled voltage and predetermined voltage threshold；
The delay circuit, the overcurrent for generating intelligent power module under current operating temperature are held time；
The overcurrent protection program of the intelligent power module realizes following steps when being executed by the microcontroller：
S10 obtains the sampled voltage of three bridge output ends under intelligent power module, and obtains the work at present of intelligent power module
Temperature；
S20, when being maintained according to the operating temperature of the current operating temperature and preset intelligent power module and default overcurrent
Between mapping relations, determine that the overcurrent of intelligent power module under current operating temperature is held time；
S30, when the duration that the sampled voltage is more than predetermined voltage threshold is greater than or equal under the current operating temperature
When the overcurrent of intelligent power module is held time, overcurrent protection is executed to the intelligent power module, controls the intelligent power
Module from service.
4. intelligent power module as claimed in claim 3 protects circuit, which is characterized in that the predetermined voltage threshold be more than or
Equal to 2V.
5. intelligent power module as described in claim 3 or 4 protects circuit, which is characterized in that the temperature sampling circuit with
The I/O port of the microcontroller connects；The voltage sampling circuit includes first resistor, the first end of the first resistor respectively with
The lower three bridges output end of the intelligent power module and voltage comparator circuit connection, the second termination of the first resistor
Ground.
6. intelligent power module as claimed in claim 5 protects circuit, which is characterized in that the voltage comparator circuit includes work
Make voltage input end, voltage comparator, second resistance and predetermined voltage threshold generation circuit unit；Wherein：
The in-phase input end of the voltage comparator is connect with the first end of first resistor described in the voltage sampling circuit, institute
The inverting input for stating voltage comparator is connect with the output end of the predetermined voltage threshold generation circuit unit, the voltage ratio
It is connect respectively with the interrupt pin of the first end of the second resistance and the microcontroller compared with the output end of device, the second resistance
Second end connect with the operating voltage input terminal.
7. intelligent power module as claimed in claim 6 protects circuit, which is characterized in that the predetermined voltage threshold generates electricity
Road unit includes 3rd resistor, the 4th resistance and the operating voltage input terminal；Wherein：
The first end of the 3rd resistor is connect with the operating voltage input terminal, and the second end of the 3rd resistor is described pre-
If the output end of voltage threshold generation circuit unit, the second end of the 3rd resistor reverse phase with the voltage comparator respectively
The first end of input terminal and the 4th resistance connects, the second end ground connection of the 4th resistance.
8. intelligent power module as claimed in claim 7 protects circuit, which is characterized in that the delay circuit includes the 5th electricity
Resistance, multiple capacitances and multiple electronic switches corresponding with multiple capacitances；Wherein：
The first end of 5th resistance connects with the interrupt pin of the output end of the voltage comparator and the microcontroller respectively
It connecing, the second end of the 5th resistance is connect with the first end of each electronic switch respectively, and the second of each electronic switch
End is respectively connect with the first end of a capacitance, and the second end of each capacitance is grounded, the control of each electronic switch
End processed respectively I/O port connection corresponding to the microcontroller.
9. a kind of readable storage medium storing program for executing, which is characterized in that be stored with the overcurrent of intelligent power module on the readable storage medium storing program for executing
Protective program is realized when the overcurrent protection program of the intelligent power module is executed by microcontroller as any in claim 1 to 2
Intelligent power module guard method described in.
10. a kind of air conditioner, which is characterized in that the air conditioner includes intelligent power module protection circuit, the intelligent power
Module protection circuit is that the intelligent power module described in any one of claim 3 to 8 protects circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810104647.7A CN108306261B (en) | 2018-01-31 | 2018-01-31 | Intelligent power module guard method, circuit, readable storage medium storing program for executing and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810104647.7A CN108306261B (en) | 2018-01-31 | 2018-01-31 | Intelligent power module guard method, circuit, readable storage medium storing program for executing and air conditioner |
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| CN108306261A true CN108306261A (en) | 2018-07-20 |
| CN108306261B CN108306261B (en) | 2019-10-25 |
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| CN110690683A (en) * | 2019-11-05 | 2020-01-14 | 四川虹美智能科技有限公司 | Overcurrent protection circuit and overcurrent protection device of intelligent power module |
| CN113983664A (en) * | 2021-10-29 | 2022-01-28 | 北京小米移动软件有限公司 | Air conditioner, control method thereof, and computer-readable storage medium |
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| Publication number | Publication date |
|---|---|
| CN108306261B (en) | 2019-10-25 |
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