CN104596045B - The temprature control method of air-conditioning system frequency conversion device - Google Patents
The temprature control method of air-conditioning system frequency conversion device Download PDFInfo
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- CN104596045B CN104596045B CN201510080316.0A CN201510080316A CN104596045B CN 104596045 B CN104596045 B CN 104596045B CN 201510080316 A CN201510080316 A CN 201510080316A CN 104596045 B CN104596045 B CN 104596045B
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- 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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- 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
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a kind of temprature control method of air-conditioning system frequency conversion device, temprature control method includes：Temperature to frequency converter is detected, obtains the temperature data of frequency converter；The working frequency of compressor is adjusted according to temperature data, by adjusting the working frequency of compressor, so that the temperature of frequency converter is in preset range.By the temprature control method that provides of the present invention, the problem of can solve the problem that air-conditioning system of the prior art uncontrollable module temperature.
Description
Technical field
The present invention relates to air conditioner technical field, in particular to a kind of temperature control side of air-conditioning system frequency conversion device
Method.
Background technology
At present, frequency converter operationally, if the module temperature of frequency converter is too high, can influence overall unit in air-conditioning system
Normally use；If the module temperature of frequency converter is too low, condensation can be produced in frequency converter.
In the prior art due to lacking the method for corresponding control module temperature so that the operating temperature of uncontrollable module,
So as to which the normal work of air-conditioning system can not be ensured.
The content of the invention
It is a primary object of the present invention to provide a kind of temprature control method of air-conditioning system frequency conversion device, to solve existing skill
The problem of air-conditioning system in art uncontrollable module temperature.
To achieve these goals, according to a kind of temprature control method of air-conditioning system frequency conversion device of offer of the present invention, temperature
Degree control method includes：Temperature to frequency converter is detected, obtains the temperature data of frequency converter；Adjusted and pressed according to temperature data
The working frequency of contracting machine, by adjusting the working frequency of compressor, so that the temperature of frequency converter is in preset range.
Further, the working frequency for adjusting compressor according to temperature data is specifically included：According to temperature data, obtain and become
Operating temperature before the change of frequency device and the operating temperature after the change of frequency converter；According to the operating temperature before change and change
Operating temperature afterwards, obtains the rate temperature change of frequency converter；The working frequency of compressor is adjusted according to rate temperature change.
Further, before the working frequency of compressor is adjusted according to temperature data, in addition to：Obtain the change of frequency converter
The temperature range residing for operating temperature before change, wherein, temperature range is to be drawn the operating temperature range of frequency converter in advance
One in the multiple temperature ranges got；Temperature range and temperature according to residing for the operating temperature before the change of frequency converter
Data, select corresponding adjustable strategies to adjust the working frequency of compressor.
Further, according to temperature range and temperature data, corresponding adjustable strategies are selected to adjust the work of compressor
Frequency is specifically included：Corresponding to multiple temperature ranges, the working frequency of adjustment compressor includes multiple adjustable strategies, each temperature
Interval one adjustable strategies of correspondence.
Further, multiple adjustable strategies are included in the working frequency corresponding to multiple temperature ranges, adjustment compressor, often
In the step of individual temperature range one adjustable strategies of correspondence, temperature range includes the first temperature range that temperature successively decreases successively, the
Two temperature ranges, the 3rd temperature range and the 4th temperature range；Adjustable strategies include the first adjustable strategies, the second adjustment plan
Slightly, the 3rd adjustable strategies and the 4th adjustable strategies, the first adjustable strategies the first temperature range of correspondence, the second adjustable strategies correspondence
Second temperature is interval, the 3rd adjustable strategies the 3rd temperature range of correspondence, the 4th adjustable strategies the 4th temperature range of correspondence.
Further, according to temperature range and temperature data, corresponding adjustment mode is selected to adjust the work of compressor
In the step of working frequency, when the operating temperature before the change of frequency converter is located in the first temperature range, if rate temperature change
More than or equal to 0, then compressor carries out raising frequency operation, if rate temperature change is less than 0, compressor keeps current frequency；When
When operating temperature before the change of frequency converter is located in second temperature interval, if rate temperature change is more than or equal to 0, compress
Machine carries out raising frequency operation, if rate temperature change is less than 0, compressor keeps current frequency；Work before the change of frequency converter
When making temperature in the 3rd temperature range, if rate temperature change is more than 0, compressor carries out raising frequency operation, if temperature becomes
Change speed and be equal to 0, then compressor keeps current frequency, if rate temperature change is less than 0, compressor carries out frequency redution operation；When
When operating temperature before the change of frequency converter is located in the 4th temperature range, if rate temperature change is more than 0, compressor is kept
Current frequency, if rate temperature change is less than or equal to 0, compressor carries out frequency redution operation.
Further, when the operating temperature before the change of frequency converter is located in second temperature interval, if temperature change is fast
Rate is more than 1, then compressor raising frequency b1Hz, if rate temperature change is more than 0 and less than or equal to 1, compressor raising frequency b2Hz, if
Rate temperature change is equal to 0, then compressor raising frequency b3Hz。
Further, when the operating temperature before the change of frequency converter is located in the 3rd temperature range, if temperature change is fast
Rate is more than 1, then compressor raising frequency c1Hz, if rate temperature change is more than 0 and less than or equal to 1, compressor raising frequency c2Hz, if
Rate temperature change is equal to 0, then compressor keeps current frequency, if rate temperature change is more than or equal to -1 and less than 0, presses
Contracting machine frequency reducing c3Hz, if rate temperature change is less than -1, compressor frequency reducing c4Hz。
Further, after the working frequency step of compressor is adjusted according to temperature data, temprature control method is also wrapped
Include：Connected according to the temperature of frequency converter or disconnect the controlling brancher in parallel with frequency converter.
Further, connected according to the temperature of frequency converter or disconnect the controlling brancher in parallel with frequency converter and specifically included：Root
According to the operating temperature of frequency converter, the first preset temperature value and the second preset temperature value are set；When the temperature of frequency converter is more than or waits
When the first preset temperature value, branch road disconnects；When the temperature of frequency converter is less than or equal to the second preset temperature value, branch road connects
It is logical；Wherein, the first preset temperature value is less than the second preset temperature value.
Apply the technical scheme of the present invention, detected by the temperature to frequency converter, and adjusted according to the temperature data
The working frequency of compressor, you can the operation conditions of frequency converter is directly affected by the working frequency of compressor, in compressor
When working frequency is higher, the live load of frequency converter accordingly increases, and so the module temperature in frequency converter can be caused accordingly to increase,
When the working frequency of compressor is relatively low, the live load of frequency converter is small so that the module temperature in frequency converter is accordingly relatively low.It is logical
Cross above-mentioned adjustable strategies, you can efficiently and accurately adjust module temperature in frequency converter.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its illustrate be used for explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 shows the flow chart of the temprature control method of the air-conditioning system frequency conversion device provided according to embodiments of the present invention；
Fig. 2 shows the flow of the temprature control method of the air-conditioning system frequency conversion device provided according to further embodiment of this invention
Figure；
Fig. 3 shows the flow of the temprature control method of the air-conditioning system frequency conversion device provided according to further embodiment of this invention
Figure；
Fig. 4 shows the structural representation of the air-conditioning system frequency conversion device provided according to embodiments of the present invention.
Wherein, above-mentioned accompanying drawing is marked including the following drawings：
10th, compressor；20th, frequency converter；30th, branch road.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
As shown in Figures 1 to 4, the invention provides a kind of temprature control method of air-conditioning system frequency conversion device, the temperature control
Method processed includes：
S101, the temperature to frequency converter 20 is detected, obtains the temperature data of frequency converter 20,
S103, the working frequency of compressor 10 is adjusted according to temperature data, by adjusting the working frequency of compressor, so that
The temperature of frequency converter is in preset range.
Detected by the temperature to frequency converter 20, and according to the working frequency of temperature data adjustment compressor 10,
The operation conditions of frequency converter 20 can be directly affected by the working frequency of compressor 10, makes working frequency and the change of compressor 10
The caloric value of frequency device 20 matches.When the working frequency of compressor 10 is higher, the live load of frequency converter 20 accordingly increases, such as
This can cause the module temperature in frequency converter 20 accordingly to increase, when the working frequency of compressor 10 is relatively low, the work of frequency converter 20
Make load small so that the module temperature in frequency converter 20 is accordingly relatively low.Pass through above-mentioned adjustable strategies, you can efficiently and accurately adjust
Module temperature in whole frequency converter 20.
As shown in Fig. 2 wherein, being specifically included according to the working frequency that temperature data adjusts compressor 10：
S201, according to temperature data, is obtained after the operating temperature before the change of frequency converter 20 and the change of frequency converter 20
Operating temperature；
S202, according to the operating temperature before change and the operating temperature after change, calculates frequency converter 20 in unit interval t
Rate temperature change；
S203, the working frequency of compressor 10 is adjusted according to rate temperature change.
As shown in figure 3, specifically, before the working frequency of compressor 10 is adjusted according to temperature data, in addition to：
S301, obtains the temperature range residing for the operating temperature before the change of frequency converter, wherein, temperature range is by frequency conversion
The operating temperature range of device carries out dividing one in obtained multiple temperature ranges in advance；
The operating temperature range of frequency converter 20 divide to obtained multiple temperature ranges, according to the frequency conversion of acquisition in advance
Operating temperature before the change of device 20, finds the temperature range where correspondence, then out of multiple temperature ranges that divide in advance
According to residing temperature range and the temperature data obtained, select corresponding adjustable strategies to adjust the work frequency of compressor 10
Rate.Wherein, the working frequency of adjustment compressor 10 includes multiple adjustable strategies, one adjustable strategies of each temperature range correspondence.
By dividing multiple temperature ranges, correspondence different temperatures interval uses different adjustable strategies, ensure that in frequency converter 20
Module temperature steady change, it is to avoid influence the normal work of frequency converter 20 due to floating too big.
S302, temperature range and temperature data according to residing for the operating temperature before the change of frequency converter are selected corresponding
Adjustable strategies adjust the working frequency of compressor.
Specifically, according to actual adjustment demand and adjustment accuracy, temperature range includes first that temperature is successively decreased successively
Temperature range, second temperature interval, the 3rd temperature range and the 4th temperature range.Adjustable strategies include the first adjustable strategies,
Second adjustable strategies, the 3rd adjustable strategies and the 4th adjustable strategies.Wherein, the first temperature range of the first adjustable strategies correspondence,
Second adjustable strategies correspondence second temperature is interval, the 3rd adjustable strategies the 3rd temperature range of correspondence, the 4th adjustable strategies correspondence the
Four temperature ranges.
In the embodiment that the present invention is provided, according to the temperature range and temperature data at specific place, corresponding adjust is selected
Perfect square formula adjusts the working frequency of compressor 10, specifically, when operating temperature before the change of frequency converter 20 is located at the first temperature
When in degree is interval, if rate temperature change is more than or equal to 0, compressor 10 carries out raising frequency operation, if rate temperature change is small
In 0, then compressor 10 keeps current frequency；When the operating temperature before the change of frequency converter 20 is located in second temperature interval,
If rate temperature change is more than or equal to 0, compressor 10 carries out raising frequency operation, if rate temperature change is less than 0, compressor
10 keep current frequency；When the operating temperature before the change of frequency converter 20 is located in the 3rd temperature range, if temperature change is fast
Rate is more than 0, then compressor 10 carries out raising frequency operation, if rate temperature change is equal to 0, compressor 10 keeps current frequency, if
Rate temperature change is less than 0, then compressor 10 carries out frequency redution operation；When the operating temperature before the change of frequency converter 20 is located at the 4th
When in temperature range, if rate temperature change be more than 0, compressor 10 keep current frequency, if rate temperature change be less than or
Equal to 0, then compressor 10 carries out frequency redution operation.
Wherein, when the operating temperature before the change of frequency converter 20 is located in second temperature interval, if rate temperature change
More than 1, then the raising frequency b of compressor 101Hz, if rate temperature change is more than 0 and less than or equal to 1, the raising frequency b of compressor 102Hz,
If rate temperature change is equal to 0, the raising frequency b of compressor 103Hz.Wherein, b1、b2、b3Numerical value be sequentially reduced.Similarly, change is worked as
When operating temperature before the change of frequency device 20 is located in the 3rd temperature range, if rate temperature change is more than 1,10 liters of compressor
Frequency c1Hz, if rate temperature change is more than 0 and less than or equal to 1, the raising frequency c of compressor 102Hz, if rate temperature change is equal to
0, then compressor 10 keeps current frequency, if rate temperature change is more than or equal to -1 and less than 0, the frequency reducing of compressor 10
c3Hz, if rate temperature change is less than -1, the frequency reducing c of compressor 104Hz.Wherein, c1Numerical value be more than c2Numerical value, c3Numerical value
Less than c4Numerical value.Quick regulation so can be accomplished, when its is inclined when the operating temperature deviation design temperature of frequency converter 20 is larger
When smaller from design temperature, accomplish to fine-tune.
In the present embodiment, after the working frequency step of compressor 10 is adjusted according to temperature data, the temperature control
Method also includes：Connected according to the temperature of frequency converter 20 or disconnect the controlling brancher 30 in parallel with frequency converter 20.Specifically, first root
According to the operating temperature of frequency converter 20, the first preset temperature value and the second preset temperature value are set, when the temperature of frequency converter 20 is more than
Or during equal to the first preset temperature value, branch road 30 disconnects, refrigerant is flowed into frequency converter 20, frequency converter 20 is carried out by refrigerant
Cooling.When the temperature of frequency converter 20 is less than or equal to the second preset temperature value, branch road 30 is connected, and refrigerant is gone into branch road 30,
Make refrigerant without frequency converter 20, to prevent the module temperature in frequency converter 20 too low.Wherein, the first preset temperature value is less than the
Two preset temperature values.By this method can in auxiliary adjustment frequency converter 20 module temperature, be further ensured that total system
Reliability.
It should be noted that the above method is the process adjusted in real time, its adjustment cycle determines according to t numerical value, such as
This can make system reach dynamic equilibrium.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (9)
1. a kind of temprature control method of air-conditioning system frequency conversion device, it is characterised in that the temprature control method includes：
Temperature to frequency converter is detected, obtains the temperature data of the frequency converter；
The working frequency of compressor is adjusted according to the temperature data, by adjusting the working frequency of the compressor, so that institute
The temperature for stating frequency converter is in preset range；
Specifically included according to the working frequency that the temperature data adjusts compressor：
According to the temperature data, obtain after the operating temperature before the change of the frequency converter and the change of the frequency converter
Operating temperature；
According to the operating temperature after the operating temperature before the change and the change, the temperature change speed of the frequency converter is obtained
Rate；
The working frequency of the compressor is adjusted according to the rate temperature change.
2. the temprature control method of air-conditioning system frequency conversion device according to claim 1, it is characterised in that according to the temperature
Before the working frequency of degrees of data adjustment compressor, in addition to：
The temperature range residing for the operating temperature before the change of the frequency converter is obtained, wherein, the temperature range is will be described
The operating temperature range of frequency converter carries out dividing one in obtained multiple temperature ranges in advance；
The temperature range and the temperature data according to residing for the operating temperature before the change of the frequency converter, selection correspondence
Adjustable strategies adjust the working frequency of the compressor.
3. the temprature control method of air-conditioning system frequency conversion device according to claim 2, it is characterised in that according to the temperature
Interval and described temperature data, selects corresponding adjustable strategies to be specifically included to adjust the working frequency of the compressor：
Corresponding to the multiple temperature range, adjusting the working frequency of the compressor includes multiple adjustable strategies, each described
Temperature range one adjustable strategies of correspondence.
4. the temprature control method of air-conditioning system frequency conversion device according to claim 3, it is characterised in that corresponding to described
Multiple temperature ranges, adjusting the working frequency of the compressor includes multiple adjustable strategies, each temperature range correspondence one
In the step of individual adjustable strategies,
The temperature range include the first temperature range, second temperature that temperature successively decreases successively interval, the 3rd temperature range and
4th temperature range；
The adjustable strategies include the first adjustable strategies, the second adjustable strategies, the 3rd adjustable strategies and the 4th adjustable strategies, institute
The first adjustable strategies correspondence first temperature range is stated, the second adjustable strategies correspondence second temperature is interval, described
3rd adjustable strategies correspondence the 3rd temperature range, the 4th adjustable strategies correspondence the 4th temperature range.
5. the temprature control method of air-conditioning system frequency conversion device according to claim 4, it is characterised in that according to the temperature
In the step of interval and described temperature data of degree, working frequency of the corresponding adjustment mode of selection to adjust the compressor,
When the operating temperature before the change of the frequency converter is located in first temperature range, if the rate temperature change
More than or equal to 0, then the compressor carries out raising frequency operation, if the rate temperature change is less than 0, the compressor is kept
Current frequency；
When the operating temperature before the change of the frequency converter is located in second temperature interval, if the rate temperature change
More than or equal to 0, then the compressor carries out raising frequency operation, if the rate temperature change is less than 0, the compressor is kept
Current frequency；
When the operating temperature before the change of the frequency converter is located in the 3rd temperature range, if the rate temperature change
More than 0, then the compressor carries out raising frequency operation, if the rate temperature change is equal to 0, the compressor keeps current frequency
Rate, if the rate temperature change is less than 0, the compressor carries out frequency redution operation；
When the operating temperature before the change of the frequency converter is located in the 4th temperature range, if the rate temperature change
More than 0, then the compressor keeps current frequency, if the rate temperature change is less than or equal to 0, the compressor is carried out
Frequency redution operation.
6. the temprature control method of air-conditioning system frequency conversion device according to claim 5, it is characterised in that
When the operating temperature before the change of the frequency converter is located in second temperature interval, if the rate temperature change
More than 1, then the compressor raising frequency b1Hz, if the rate temperature change is more than 0 and less than or equal to 1, the compressor
Raising frequency b2Hz, if the rate temperature change is equal to 0, the compressor raising frequency b3Hz。
7. the temprature control method of air-conditioning system frequency conversion device according to claim 5, it is characterised in that
When the operating temperature before the change of the frequency converter is located in the 3rd temperature range, if the rate temperature change
More than 1, then the compressor raising frequency c1Hz, if the rate temperature change is more than 0 and less than or equal to 1, the compressor
Raising frequency c2Hz, if the rate temperature change is equal to 0, the compressor keeps current frequency, if the rate temperature change
More than or equal to -1 and less than 0, then the compressor frequency reducing c3Hz, if the rate temperature change is less than -1, the compression
Machine frequency reducing c4Hz。
8. the temprature control method of air-conditioning system frequency conversion device according to claim 1, it is characterised in that according to the temperature
After the working frequency step of degrees of data adjustment compressor, the temprature control method also includes：
Connected according to the temperature of the frequency converter or disconnect the controlling brancher in parallel with the frequency converter.
9. the temprature control method of air-conditioning system frequency conversion device according to claim 8, it is characterised in that according to the frequency conversion
The temperature connection of device or the disconnection controlling brancher in parallel with the frequency converter are specifically included：
According to the operating temperature of the frequency converter, the first preset temperature value and the second preset temperature value are set；
When the temperature of the frequency converter is more than or equal to first preset temperature value, the branch road disconnects；
When the temperature of the frequency converter is less than or equal to second preset temperature value, the branch road connection；
Wherein, first preset temperature value is less than second preset temperature value.
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| CN201510080316.0A CN104596045B (en) | 2015-02-12 | 2015-02-12 | The temprature control method of air-conditioning system frequency conversion device |
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| CN201510080316.0A CN104596045B (en) | 2015-02-12 | 2015-02-12 | The temprature control method of air-conditioning system frequency conversion device |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949267A (en) * | 2015-06-08 | 2015-09-30 | 广东美的暖通设备有限公司 | Method and device for judging failure of frequency conversion module temperature detecting device |
| CN104949269A (en) * | 2015-06-08 | 2015-09-30 | 广东美的暖通设备有限公司 | System control method and device for overhigh module temperature |
| CN105299825B (en) * | 2015-06-30 | 2018-07-10 | 广东美的暖通设备有限公司 | The limit frequency guard method of air-conditioning |
| CN105546754B (en) * | 2016-01-04 | 2019-07-19 | 广东美的暖通设备有限公司 | Temprature control method, device and the air-conditioning of frequency converter |
| CN105546760B (en) * | 2016-01-12 | 2018-08-17 | 芜湖美智空调设备有限公司 | Compressor control method, device and the air conditioner of air conditioner |
| CN108518827B (en) * | 2018-02-28 | 2019-09-20 | 珠海格力电器股份有限公司 | The control method and air-conditioning system of air-conditioning system |
| CN110425711B (en) * | 2019-09-05 | 2021-12-21 | 宁波奥克斯电气股份有限公司 | Temperature control method and device of intelligent power module and air conditioner |
| CN111397077B (en) * | 2020-02-24 | 2021-03-23 | 珠海格力电器股份有限公司 | Temperature control method and device, storage medium and air conditioner |
| CN113188234B (en) * | 2021-05-13 | 2022-05-17 | 珠海格力电器股份有限公司 | Power module condensation prevention control method and device, storage medium and air conditioning system |
| CN114087736B (en) * | 2021-11-26 | 2022-11-18 | 珠海格力电器股份有限公司 | Constant-temperature dehumidification control method based on system reliability and air conditioner |
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|---|---|---|---|---|
| JPH03291446A (en) * | 1990-04-06 | 1991-12-20 | Matsushita Refrig Co Ltd | Defrost controller for air conditioner |
| CN101821509A (en) * | 2007-10-08 | 2010-09-01 | 艾默生环境优化技术有限公司 | Compressor protection system and method |
| KR20090039486A (en) * | 2007-10-18 | 2009-04-22 | 엘지전자 주식회사 | Motor controller of air conditioner |
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| CN203519173U (en) * | 2013-04-12 | 2014-04-02 | 天津瑞能电气有限公司 | Automatic recording device for temperature data of wind power frequency converter |
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| CN104596045A (en) | 2015-05-06 |
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