CN104566819A - System and method for monitoring temperature stress of air conditioner - Google Patents
System and method for monitoring temperature stress of air conditioner Download PDFInfo
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- CN104566819A CN104566819A CN201410835960.XA CN201410835960A CN104566819A CN 104566819 A CN104566819 A CN 104566819A CN 201410835960 A CN201410835960 A CN 201410835960A CN 104566819 A CN104566819 A CN 104566819A
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- temperature
- pfc circuit
- igbt
- temperature stress
- frd
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
Abstract
The invention discloses a system and a method for monitoring the temperature stress of an air conditioner. The method includes the steps: acquiring operating parameters of a PFC (power factor correction) circuit of an outdoor unit at a preset time interval; calculating temperature stress parameters of the PFC circuit according to the operating parameters; accumulating operating time of the outdoor unit when the temperature stress parameters exceed a temperature threshold, judging whether the accumulated operating time is longer than preset temperature stress release time or not, and if yes, sending a temperature stress release operating order to the outdoor unit. The system and the method for monitoring the temperature stress of the air conditioner have the advantages that by monitoring of the temperature stress parameters of the PFC circuit, temperature stress release is carried out when the operating time with the temperature stress exceeded reaches the upper limit, and consequently the air conditioner is enabled to operate under a load lower than a rated load, and reliability of equipment is improved while service life of the equipment is prolonged.
Description
Technical field
The present invention relates to airconditioning control field, particularly relate to a kind of method for supervising and system of air-conditioner temperature stress.
Background technology
Along with the extensive use of the development of Power Electronic Technique, particularly converter technique, the air-conditioner of current main flow is at cooling or heating effect, and humid control, there has been huge progress purification of air and energy-conservation aspect.By wireless communication technique and Internet technology are applied in air-conditioning, current air-conditioner is in hommization, and the aspects such as household, intellectuality and energy-saving obtain investigation and application widely of knowing clearly.
In the detachable air conditioner of current domestic applications, off-premises station is all work under the environment of rather harsh.Typical off-premises station is mounted on outdoor wall, and the difference of dress region, Yian, the environment temperature of off-premises station work may the change from-20 DEG C to 50 DEG C.
In convertible frequency air-conditioner, off-premises station circuit is primarily of rectification circuit, and PFC (Power FactorCorrection, PFC) circuit and inverter circuit form.Input AC civil power, after rectification circuit, becomes the direct current of pulsation.Pfc circuit mainly comprises inductance, electric capacity, sampling resistor, igbt (Insulated Gate Bipolar Transistor, IGBT) and fast recovery diode (Fast RecoveryDiode, FRD).After the adjustment of pfc circuit, the voltage that DC side exports is a steady state value, and AC input current and input voltage have identical phase place simultaneously.The DC voltage alternating voltage that output amplitude and frequency are all variable after inverter circuit that DC side exports, drives the running of compressor.Because off-premises station is operated in rugged environment, therefore automatically controlled to outdoor reliability proposes strict requirement.Pfc circuit flows through large electric current when normal work, and the power semiconductor therefore in circuit all will consume very large power, and this causes its junction temperature will much larger than environment temperature.Pfc circuit operationally bears very high temperature stress, and its reliability is one of key factor of outdoor automatically controlled reliability.
Summary of the invention
Based on this, be necessary the method for supervising that a kind of air-conditioner temperature stress is provided, the temperature stress of pfc circuit is monitored, guarantee that air-conditioner can more intelligent and reliable operation.
The invention provides a kind of method for supervising of air-conditioner temperature stress, comprise the following steps:
S110, obtains the operational factor of the pfc circuit of off-premises station every Preset Time;
S120, calculates the junction temperature of IGBT and the junction temperature of FRD in described pfc circuit according to described operational factor;
S130, accumulates described off-premises station and operates in the junction temperature of described IGBT and the junction temperature of FRD that at least one exceeds the running time of corresponding temperature threshold;
S140, judges whether the running time accumulated is greater than the preset temperature Stress Release time, if then perform step S150, otherwise performs step S110;
S150, sends instruction to described off-premises station, makes described off-premises station perform temperature stress releasing operation.
In addition, additionally provide a kind of monitoring system of air-conditioner temperature stress, comprise data obtaining module, data analysis module and control module, wherein:
Described data obtaining module is used for the operational factor obtaining the pfc circuit of off-premises station every Preset Time;
Described data analysis module is used for calculating the junction temperature of IGBT and the junction temperature of FRD in described pfc circuit according to described operational factor;
For accumulating described off-premises station, described control module operates in the junction temperature of described IGBT and the junction temperature of FRD that at least one exceeds the running time of corresponding temperature threshold; Also for judging whether accumulated running time is greater than the preset temperature Stress Release time, if so, then sending instruction to described off-premises station, make described off-premises station perform temperature stress releasing operation, otherwise described data obtaining module reruning.
The method for supervising of above-mentioned air-conditioner temperature stress and system can pass through the junction temperature of middle IGBT and the junction temperature of FRD of monitoring pfc circuit, to judge whether the running time at high-temperature stress of system arrives the upper limit.So, under the state that air-conditioner can be made to be operated in lower than rated load, improve reliability and the service life of equipment.
Accompanying drawing explanation
Fig. 1 is the module map of the monitoring system of air-conditioning actuator temperature stress in present pre-ferred embodiments;
Fig. 2 is the structural representation of the typical pfc circuit of air-conditioner outdoor unit;
Fig. 3 is the flow chart of the method for supervising of air-conditioning actuator temperature stress in present pre-ferred embodiments;
Fig. 4 is the present invention's more flow chart of the method for supervising of air-conditioning actuator temperature stress in specific embodiment.
Detailed description of the invention
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Referring to Fig. 1, the monitoring system of air-conditioning actuator temperature stress in present pre-ferred embodiments, in the present embodiment, can run with air-conditioner 10 for core carrier, also can be for core carrier runs with client 20 (intelligent terminal).Below with client 20 for core carrier run, describe preferred embodiment of the present invention in detail.
The monitoring system of air-conditioner temperature stress comprises air-conditioner 10, client 20 and Cloud Server 30, this client 20 and described air-conditioner 10 and Cloud Server 30 network communication.
Air-conditioner 10 comprises data acquisition module 11, controller 12 and communication module; Data acquisition module 11 mainly carries out real-time sampling to the operational factor of the pfc circuit of off-premises station, and the running status of controller 12 pairs of air-conditioners 10 controls.
Client 20 comprises data obtaining module 21, data analysis module 22, control module 23, data disaply moudle 24 and communication module.Data obtaining module 21 mainly completes initialized work, obtains the type information of air-conditioner 10 and the geographical position of air-conditioner 10 installation, and sends to Cloud Server 30.Cloud Server 30 retrieves air-conditioning information database 31, and the air-conditioning data (mainly the mutually electrical parameter information of the composition device of pfc circuit) sending respective model are to data analysis module 22, being transmitted in when data analysis module 22 runs for the first time of these data is carried out, and follow-uply carries out synchronous renewal when air-conditioning information database upgrades.Data analysis module 22 mainly calculates the data analysis obtained from air-conditioner 10 and Cloud Server 30, provides the temperature stress data of pfc circuit.Control module 23 mainly exports data to data analysis module 22 and monitors in real time, and outputs a control signal to the control module 23 of air-conditioner 10.The data that data disaply moudle 24 pairs of data analysis modules 22 and control module 23 export carry out showing in real time, intuitively.
Cloud Server 30 comprises air-conditioning information database 31 and communication module.
In the present embodiment, the environment temperature of air-conditioner 10 can be obtained by weather server 40, also can obtain environment temperature by the temperature sensor on machine disposed in the outdoor.So, weather server 40 comprises weather real-time data base 41 and communication module.Cloud Server 30 and weather server 40 communication, obtain the environment temperature in the geographical position at air-conditioner 10 place, and send to the data analysis module 22 of client 20 from weather server 40 according to geographical position acquisition.If the weather real-time data base 41 of weather server 40 cannot connect, the data analysis module 22 of intelligent terminal will ignore this temperature information, or obtain environment temperature by temperature sensor disposed in the outdoor.
Each above-mentioned communication module is connected by network communication.Especially, be that the communication module of air-conditioner 10 is connected with the communication module of client 20, the communication module of client 20 is connected with the communication module of Cloud Server 30, and the communication module of Cloud Server 30 is connected with the communication module of weather server 40.
In more detailed embodiment, system first arranges the preset temperature Stress Release time, when the summation that the junction temperature of the IGBT in pfc circuit running and/or the junction temperature of FRD operate in the running time exceeding temperature threshold arrives or exceedes the preset temperature Stress Release time, then control air-conditioner 10 performs and operates with release temperature stress accordingly.Refer to Fig. 1 and Fig. 2, particularly:
Described data obtaining module 21 is for obtaining the operational factor of the pfc circuit of off-premises station every Preset Time.This Preset Time can be arranged according to the size of preset temperature Stress Release time, with 0.1%, 1% or 3% time be a sampling period.The operational factor of pfc circuit comprises operating current and the environment temperature of the FRD in the operating current of the IGBT in the output voltage of pfc circuit, pfc circuit, pfc circuit.
Described data analysis module 22 is for calculating the junction temperature of IGBT and the junction temperature of FRD in pfc circuit according to the described operational factor of pfc circuit and parameter information.
Described control module 23 judges whether the junction temperature of the middle IGBT of pfc circuit and the junction temperature (temperature stress parameter) of FRD have at least one to be greater than corresponding temperature threshold.If so, the running time exceeding temperature threshold that described off-premises station to operate in the junction temperature of described IGBT and the junction temperature of FRD at least one is then accumulated; Otherwise described data obtaining module 21 reruns, and enters the resampling of the operational factor of the pfc circuit in next sampling period.Exceed the running time of temperature threshold: the sampling period (i.e. above-mentioned Preset Time) exceeding temperature stress standard (temperature threshold) to run on temperature stress parameter adds up, and runs on temperature stress parameter and does not add up lower than sampling period of temperature stress standard.
Described control module 23 is also for judging whether accumulated running time is greater than the preset temperature Stress Release time.If so, then send instruction to described off-premises station, make described off-premises station perform temperature stress releasing operation; Otherwise described data obtaining module 21 reruns, and enters the resampling of the operational factor of the pfc circuit in next sampling period.It should be noted that, this Preset Time is a preset value, and when system cloud gray model exceeds this preset value in the cumulative time that the junction temperature of above-mentioned IGBT and the junction temperature of FRD have at least one to be greater than corresponding temperature threshold, system will perform temperature stress releasing operation.
Off-premises station performs temperature stress releasing operation and is specially: reduce knot to environment thermal resistance, reduce the dissipated power of IGBT in pfc circuit and reduce one or more of dissipated power three kinds of modes of FRD in pfc circuit.Reducing knot can by the rotating speed of the outer blower fan of increase and then the coefficient of heat transfer increasing air to the thermal resistance of environment; The dissipated power reducing IGBT, FRD in pfc circuit can be realized by the output current of instantaneous reduction pfc circuit.
In embodiments of the invention, can be passed through the junction temperature of middle IGBT and the junction temperature of FRD of monitoring pfc circuit by monitoring, to judge whether the running time at high-temperature stress of system arrives the upper limit.So, under the state that air-conditioner can be made to be operated in lower than rated load, improve reliability and the service life of equipment.
Further, the junction temperature of middle IGBT of pfc circuit and the calculating of the junction temperature of FRD need rely on the parameter information calculating of pfc circuit.This parameter information can be pre-stored in monitoring system, also can Real-time Obtaining.During Real-time Obtaining, data obtaining module 21 can be utilized first to obtain the model of described air-conditioner 10 and be uploaded to described Cloud Server 30; Then, the parameter information that Cloud Server 30 searches pfc circuit from air-conditioning database 31 according to described model is sent to described client 20; Finally, data analysis module 22 calculates the junction temperature of described IGBT and the junction temperature of FRD according to the operational factor of pfc circuit, parameter information and described environment temperature.
The monitoring of pfc circuit temperature stress and intelligent control method, to guarantee that air-conditioner 10 can more intelligent and reliable operation.Described air-conditioner 10 is made up of at least one off-premises station and at least one indoor set.The present invention not only can apply and domestic air conditioning, is also applicable to Large Central Air Conditioning System system.
Consult Fig. 2, typical pfc circuit comprises: input inductance L 1, igbt (IGBT) Q1, fast recovery diode (FRD) D1, electrochemical capacitor C1 and current sampling resistor R1.By periodic turn-on and turn-off IGBT Q1, constant DC voltage (output voltage) V can be obtained at electrochemical capacitor C1 two ends
out.
Consult Fig. 1 and Fig. 2, the calculating of pfc circuit temperature stress completes in the data analysis module 22 of intelligent terminal 20.Temperature stress parameter comprises the junction temperature T of IGBT Q1
j1with the junction temperature T of FRD D1
j2.According to heat conducting Ohm's law, the dissipated power P of power semiconductor, knot is to the thermal resistance R of environment
ja, junction temperature T
j, the temperature T of environment
abetween meet following relation:
T
j＝P*R
ja+T
a，
Wherein, P is the dissipated power of IGBT Q1 (or FRD D1), T
jfor the junction temperature of IGBT Q1 (or FRD D1), R
jafor IGBT Q1 (or FRD D1) knot is to the thermal resistance of environment, T
afor the temperature of environment.
During calculating, we get, and for IGBT Q1, its power consumption can be expressed as follows:
P
igbt＝D*I
c*V
ce+(E
on+E
off)*f
sw
For FRD D1, its power consumption can be expressed as follows:
P
frd＝(1-D)*I
d*V
d+E
rr*f
sw
Wherein D is the dutycycle of the pulse signal of control IGBT Q1 turn-on and turn-off, I
cand I
dbe respectively the operating current flowing through IGBT Q1 and FRD Q2, V
ceand V
dbe respectively the forward conduction voltage drop of IGBT Q1 and FRD D1, E
onand E
offbe respectively the turn-on and turn-off loss of IGBT Q1, E
rrfor the reverse recovery loss of FRD D1, f
swfor the switching frequency of IGBT Q1.Wherein, D, I
c, I
dand f
swdirectly can to obtain from sampled data or indirect calculation obtains, due to I
c, I
dchange in time with D, in therefore calculating, its mean value should be adopted.V
cefor I
cfunction, V
dfor I
dfunction, other data obtain from the air-conditioning database Cloud Server.Therefore corresponding and each sampling instant, can calculate the junction temperature T providing the IGBT Q1 determined
j1with the junction temperature T of FRD D1
j2.By monitoring IGBT Q1 operating current I
cwith the operating current I of FRD Q2
dchange both can monitor the junction temperature T of IGBT Q1
j1with the junction temperature T of FRD D1
j2change.
Refer to Fig. 3, the method for supervising of air-conditioner temperature stress comprises the following steps:
Step S110, obtains the operational factor of the pfc circuit of off-premises station every Preset Time.
Step S120, calculates the junction temperature of IGBT and the junction temperature of FRD in described pfc circuit according to described operational factor.
Step S130, accumulates described off-premises station and operates in the junction temperature of described IGBT and the junction temperature of FRD that at least one exceeds the running time of corresponding temperature threshold.
Step S140, judges whether the running time accumulated is greater than the preset temperature Stress Release time, if then perform step S150, otherwise performs step S110.
S150, sends instruction to described off-premises station, makes described off-premises station perform temperature stress releasing operation
Composition graphs 1 and Fig. 3, control module 23 is first to the junction temperature T of IGBT Q1
j1with the junction temperature T of FRD D1
j2judge.For IGBT Q1 and FRD D1, the maximum junction temperature T allowed when product manual can provide its trouble free service
jmax, be generally 150 DEG C, adopt up-to-date technique can reach 175 DEG C.There is the ripple of electric current and voltage in the power device in pfc circuit, cause the ripple of its junction temperature thus in the process of switch, and we calculate the junction temperature T of the IGBT Q1 provided
j1with the junction temperature T of FRD D1
j2be actually the mean value of junction temperature in multiple switch periods.In typical case, consider the impact of design of Reducing Rating and ripple, the junction temperature T of IGBT Q1
j1with the junction temperature T of FRD D1
j2temperature threshold be generally set as T
jmax60%-80%, i.e. the junction temperature T of IGBTQ1
j1with the junction temperature T of FRD D1
j2corresponding temperature threshold can be arranged on 90 DEG C to 140 DEG C.
If the junction temperature T of IGBT Q1
j1with the junction temperature T of FRD D1
j2in have the maximum junction temperature T of one or more diode
jmnumerical value do not meet the standard of low stress, then in the stress running time (i.e. preset temperature Stress Release time) that this sampling time counts pfc circuit.If the time that stress runs reaches higher limit, control module 23 sending controling instruction is to the controller 12 of air-conditioner 10, and controller 12 performs corresponding temperature stress releasing operation.
In a still further embodiment, the method for supervising of air-conditioner temperature stress is further comprising the steps of:
User sets operational factor, and air-conditioner 10 brings into operation; Intelligent terminal 20 obtains air-conditioner model and positional information, and is uploaded to manufacturer's Cloud Server 30 by communication module; Cloud Server 30 searches the model of air-conditioner 10 from database, obtains the parameter information calculating pfc circuit temperature stress, and sends to intelligent terminal 20; Air-conditioner 10 is every fixed time-interval sampling outdoor environment temperature T
a, the operating current I of pfc circuit
c, I
dwith output voltage V
out; Sampled data is sent to the data analysis module 22 of intelligent terminal 10 by air-conditioner 10 by communication module; Data analysis module 22 calculates the junction temperature T of IGBT in pfc circuit
j1with the junction temperature T of FRD
j2; Data analysis module 22 sends result of calculation to control module 23 and data disaply moudle 24.
In more detail, the present embodiment, is monitored and Based Intelligent Control by the temperature stress of the data analysis module 22 and control module 23 pairs of off-premises station pfc circuits that are arranged on intelligent terminal for relying in real time with client 20 and internet remote service.Refer to Fig. 1 and Fig. 4, more detailed flow process comprises the steps:
Step S10, the parameter that air-conditioning sets according to user brings into operation;
Step S11, intelligent terminal (i.e. client 20) first obtains type information and the installation site information of air-conditioner 10, is then sent in manufacturer's Cloud Server 30 by communication module.
Step S12, Cloud Server 30 searches the key parameter calculating pfc circuit temperature stress and need in air-conditioning information database 31, then sends to intelligent terminal by communication module.
Step S13, Cloud Server 30, by communication module and weather server 40 communication, obtains the environment temperature T of air-conditioner 10 region
a, and send it back intelligent terminal.Environment temperature T
acan real-time update.
Step S14, air-conditioner 10 is sampled every the operational factor of fixed time interval to the pfc circuit of off-premises station, and typical operational factor comprises: the environment temperature T of off-premises station
a, the operating current I of pfc circuit
c, I
dand output voltage.Air-conditioner 10 is sent to sampled data by communication module the data analysis module 22 of intelligent terminal 20.If regional environment temperature T
acannot weather server 40 Real-time Obtaining be passed through, then temperature sensor can be utilized to detect.
Step S15, the data that data analysis module 22 utilizes air-conditioner 10 and Cloud Server 30 to send, calculate the temperature stress parameter of pfc circuit, mainly comprise: the junction temperature T of IGBT Q1
j1with the junction temperature T of FRD D1
j2.
Step S16, data analysis module 22 sends to data disaply moudle 24 and control module 23 result of calculation.
Step S17, the junction temperature T of the IGBT Q1 in control module 23 pairs of off-premises station pfc circuit runnings
j1with the junction temperature T of FRD D1
j2monitor in real time.The junction temperature T of first right IGBT Q1
j1with the junction temperature T of FRD D1
j2analyze, judge whether it meets the standard of low stress.If all meet low temperature stress criterion (the i.e. junction temperature T of IGBT Q1
j1with the junction temperature T of FRD D1
j2lower than corresponding preset temperature threshold value), then wait for the result in next sampling period and it is rejudged; If have at least one not meet low temperature stress criterion in the two, then accumulation is operated in the running time not meeting low temperature stress criterion.If operate in the operation total time not meeting low temperature stress criterion to be less than higher limit, then wait for the result in next sampling period and it is rejudged.If operate in the operation total time not meeting low temperature stress criterion to exceed higher limit, then control module 23 is by the controller 12 of communication module sending controling instruction to air-conditioner 10.
Step S18, air-conditioner 10, under the effect of controller 12, performs the releasing operation of temperature stress.Junction temperature equals the dissipated power of power semiconductor and the product of knot to the thermal resistance of environment relative to environment temperature rise.Therefore any operation, as long as the dissipated power P that can reduce IGBT in pfc circuit
igbtwith the dissipated power P of FRD
frdor the knot of IGBT and FRD is to the thermal resistance R of environment
ja, all should be considered to the releasing operation of temperature stress.
By the present invention, the junction temperature of IGBT Q1 in monitoring off-premises station pfc circuit running that can be real-time and the junction temperature of FRD D1 also carry out Based Intelligent Control, thus guarantee the long-term reliability that off-premises station runs.
In another embodiment, with reference to figure 1, if the method for supervising of above-mentioned air-conditioner temperature stress and system are arranged in air-conditioner 10, then client can be omitted, in above-described embodiment, the modules of client 20 can be arranged on (except communication module) on air-conditioner, air-conditioner 10 and the communication of Cloud Server 30 straight-forward network, the operation method of its system is same as the previously described embodiments, repeats no more here.
The above embodiment only have expressed several embodiment of the present invention, and not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a method for supervising for air-conditioner temperature stress, is characterized in that, comprises the following steps:
S110, obtains the operational factor of the pfc circuit of off-premises station every Preset Time;
S120, calculates the junction temperature of IGBT and the junction temperature of FRD in described pfc circuit according to described operational factor;
S130, accumulates described off-premises station and operates in the junction temperature of described IGBT and the junction temperature of FRD that at least one exceeds the running time of corresponding temperature threshold;
S140, judges whether the running time accumulated is greater than the preset temperature Stress Release time, if then perform step S150, otherwise performs step S110;
S150, sends instruction to described off-premises station, makes described off-premises station perform temperature stress releasing operation.
2. method for supervising according to claim 1, is characterized in that, the operational factor of described pfc circuit comprises operating current and the environment temperature of the FRD in the operating current of the IGBT in the output voltage of pfc circuit, pfc circuit, pfc circuit.
3. method for supervising according to claim 1, it is characterized in that, described off-premises station performs temperature stress releasing operation and is specially: reduce knot to environment thermal resistance, reduce the dissipated power of IGBT in pfc circuit and reduce one or more of dissipated power three kinds of modes of FRD in pfc circuit.
4. method for supervising according to claim 1, is characterized in that, the corresponding temperature threshold of described junction temperature is 90 DEG C to 140 DEG C.
5. a monitoring system for air-conditioner temperature stress, is characterized in that, comprises data obtaining module, data analysis module and control module, wherein:
Described data obtaining module is used for the operational factor obtaining the pfc circuit of off-premises station every Preset Time;
Described data analysis module is used for calculating the junction temperature of IGBT and the junction temperature of FRD in described pfc circuit according to described operational factor;
For accumulating described off-premises station, described control module operates in the junction temperature of described IGBT and the junction temperature of FRD that at least one exceeds the running time of corresponding temperature threshold; Also for judging whether accumulated running time is greater than the preset temperature Stress Release time, if so, then sending instruction to described off-premises station, make described off-premises station perform temperature stress releasing operation, otherwise described data obtaining module reruning.
6. monitoring system according to claim 5, is characterized in that, described in state pfc circuit operational factor comprise operating current and the environment temperature of the FRD in the operating current of the IGBT in the output voltage of pfc circuit, pfc circuit, pfc circuit.
7. monitoring system according to claim 5, is characterized in that, the corresponding temperature threshold of described maximum junction temperature is 90 DEG C to 140 DEG C.
8. monitoring system according to claim 5, it is characterized in that, described monitoring system also comprises Cloud Server and client, this client and described air-conditioner and Cloud Server network communication, described data obtaining module, data analysis module and control module are arranged at this client or air-conditioner.
9. monitoring system according to claim 8, is characterized in that, described data obtaining module is also for obtaining the model of described air-conditioner and being uploaded to described Cloud Server;
The parameter information that described Cloud Server searches described pfc circuit according to described model is sent to described client;
Described data analysis module calculates the junction temperature of described IGBT and the junction temperature of FRD according to the operational factor of described pfc circuit, parameter information and described environment temperature.
10. monitoring system according to claim 9, is characterized in that, described data obtaining module, also for obtaining the geographical position of described air-conditioner, and is uploaded to described Cloud Server;
Described Cloud Server, with weather server communication, obtains the on-site described environment temperature of described air-conditioner according to described geographical position and is sent to described client.
11. monitoring systems according to any one of claim 5 to 10, it is characterized in that, described off-premises station performs temperature stress releasing operation and is specially: reduce knot to environment thermal resistance, reduce the dissipated power of IGBT in pfc circuit and reduce one or more of dissipated power three kinds of modes of FRD in pfc circuit.
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| CN106410760A (en) * | 2015-06-08 | 2017-02-15 | 瑞萨电子株式会社 | Semiconductor integrated circuit device and electronics device |
| CN108072819A (en) * | 2016-11-10 | 2018-05-25 | 西门子公司 | The abatement detecting method and device of IGBT |
| CN109831102A (en) * | 2017-11-21 | 2019-05-31 | 河北工业大学 | A kind of method, apparatus and computer readable storage medium of loss calculation |
| CN110867835A (en) * | 2019-11-26 | 2020-03-06 | 广东美的制冷设备有限公司 | Intelligent power module and air conditioner |
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| CN109831102A (en) * | 2017-11-21 | 2019-05-31 | 河北工业大学 | A kind of method, apparatus and computer readable storage medium of loss calculation |
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