CN113124501A - Air conditioner outdoor unit and air conditioner - Google Patents

Air conditioner outdoor unit and air conditioner Download PDF

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Publication number
CN113124501A
CN113124501A CN202110400145.0A CN202110400145A CN113124501A CN 113124501 A CN113124501 A CN 113124501A CN 202110400145 A CN202110400145 A CN 202110400145A CN 113124501 A CN113124501 A CN 113124501A
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China
Prior art keywords
input current
preset input
current limit
limit value
environment temperature
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Granted
Application number
CN202110400145.0A
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Chinese (zh)
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CN113124501B (en
Inventor
张俊喜
陆汉宁
殷豪杰
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN202110400145.0A priority Critical patent/CN113124501B/en
Publication of CN113124501A publication Critical patent/CN113124501A/en
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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units
    • F24F1/22—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/08—Compressors specially adapted for separate outdoor units
    • F24F1/10—Arrangement or mounting thereof
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F2110/12—Temperature of the outside air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses an air conditioner outdoor unit and an air conditioner, wherein the air conditioner outdoor unit comprises: a compressor; an IPM to provide alternating current to the compressor; the output end of the PFC circuit is connected with the input end of the IPM; a rectifier circuit that outputs a direct current to the PFC circuit; the current sampling unit is used for sampling the input current of the PFC circuit; a control unit which acquires an input detection current according to the sampled input current and controls and adjusts a frequency for the compressor according to the input detection current and a preset input current limit value; wherein the predetermined input current limit is inversely related to the outdoor ambient temperature. The invention controls and adjusts the frequency of the compressor by considering the influence of the outdoor environment temperature on the input current of the PFC circuit, and realizes the purpose of reducing the temperature and the input current during the heating period in the circuit, thereby improving the working reliability of the PFC circuit and the compressor.

Description

Air conditioner outdoor unit and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner outdoor unit and an air conditioner.
Background
The variable frequency air conditioner generally increases a Power Factor Correction (PFC) control technology so as to improve the Power Factor, adjust harmonic current and reduce the influence of the air conditioner on a Power grid.
When the IGBT in the PFC circuit has large loss, the IGBT generates heat greatly, the service life of the IGBT is shortened if the IGBT is not controlled effectively in time, and the IGBT is damaged seriously.
In addition, when the intelligent power module IPM is used for frequency conversion control of the compressor in the air conditioner outdoor unit, if the load of the air conditioner is increased, the input current of the PFC circuit cannot be controlled in time, the input current overshoots, so that large impact is caused on a power device in the PFC circuit, and the power device is seriously damaged.
Disclosure of Invention
An object of the present invention is to provide an outdoor unit of an air conditioner, which can reduce the temperature and input current during heat generation in a circuit by controlling and adjusting the frequency of a compressor in consideration of the influence of the outdoor ambient temperature on the input current of a PFC circuit, thereby improving the operational reliability of the PFC circuit and the compressor.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
the application relates to an air condensing units, its characterized in that includes:
a compressor;
an IPM providing AC power to the compressor;
the output end of the PFC circuit is connected with the input end of the IPM;
a rectifier circuit that outputs a direct current to the PFC circuit;
a current sampling unit for sampling an input current of the PFC circuit;
a control unit which acquires an input detection current according to the sampled input current and controls and adjusts a frequency for the compressor according to the input detection current and a preset input current limit value;
wherein the preset input current limit is inversely related to the outdoor ambient temperature.
In the present application, the preset input current limit includes a first preset input current limit, a second preset input current limit, and a third preset input current limit;
the second preset input current limit is a first percentage of the first preset input current limit;
the third preset input current limit is a second percentage of the first preset input current limit;
the first percentage is greater than the second percentage.
In this application, the control unit controls and adjusts the frequency used for the compressor according to the input detection current, the first preset input current limit, the second preset input current limit, and the third preset input current limit, specifically:
when the input detection current is greater than or equal to the first preset input current limit value, the control unit forcibly reduces the frequency of the compressor;
when the input detection current is greater than or equal to the second preset input current limit value and smaller than the first preset input current limit value, the control unit prohibits the compressor from increasing the frequency;
when the input detection current is greater than or equal to the third preset input current limit value and smaller than the second preset input current limit value, the control unit controls to allow the compressor to increase the frequency;
and when the input detection current is smaller than the third preset input current limit value, the control unit removes the forced frequency reduction of the compressor.
In this application, the second preset input current limit is 90% of the first preset input current limit, and the third preset input current limit is 80% of the first preset input current limit.
In this application, the outdoor unit of an air conditioner further includes:
a temperature acquisition unit for acquiring an outdoor ambient temperature in real time;
the temperature sampling unit is used for sampling the outdoor environment temperature in real time;
and the control unit acquires a corresponding preset input current limit value according to the sampled outdoor environment temperature.
In this application, by querying the data table, the control unit obtains the corresponding preset input current limit value according to the sampled outdoor environment temperature, specifically:
judging the outdoor environment temperature sampled in real time and the outdoor environment temperature in each group of data;
if the outdoor environment temperature sampled in real time is lower than the outdoor environment temperature in any group of data, acquiring a preset input current limit value corresponding to the outdoor environment temperature sampled in real time as a preset input current value corresponding to the minimum outdoor environment temperature;
if the outdoor environment temperature sampled in real time is greater than the outdoor environment temperature in any group of data, acquiring a preset input current limit value corresponding to the outdoor environment temperature sampled in real time as a preset input current value corresponding to the maximum outdoor environment temperature;
if the outdoor environment temperature sampled in real time is between two outdoor environment temperatures in adjacent groups of data, acquiring a preset input current limit value corresponding to the outdoor environment temperature sampled in real time by utilizing linear interpolation;
the data table comprises different groups of data, each group of data comprises outdoor environment temperature and a corresponding preset input current value, the outdoor environment temperature in each group of data is sequenced in sequence, and two adjacent groups of data are on the same straight line.
In this application, the input detection current is an average value of the input current sampled by the current sampling unit;
the sampling time of the outdoor environment temperature is the same as that of the current sampling unit.
In the present application, the control unit includes:
the frequency control module is used for controlling and adjusting the frequency of the modulation wave according to the input detection current and a preset input current limit value;
and the PWM driving module receives the modulation wave frequency and controls and adjusts the PWM pulse signal output to the IPM.
The application also relates to an air conditioner, which is characterized by comprising the air conditioner outdoor unit.
The application relates to an air conditioner outdoor unit, consider outdoor ambient temperature to the influence of the device that generates heat in the PFC circuit, set for three and preset the input current limit value and restrict input detection current, control the frequency of adjustment compressor, realize reducing the temperature of the device that generates heat in the circuit and the purpose of input current to improve PFC circuit and compressor operational reliability.
The application also relates to an air conditioner, which comprises the air conditioner outdoor unit.
The air conditioner limits the input current of the PFC circuit and controls and adjusts the operating frequency of the compressor, so that the purposes of reducing the input current and reducing the heat generation of devices in the input circuit are achieved.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is an electrical schematic diagram of an outdoor unit of an air conditioner according to an embodiment of the present invention;
fig. 2 is a diagram illustrating a relationship between an outdoor ambient temperature and a preset input current limit in an embodiment of an outdoor unit of an air conditioner according to the present invention;
fig. 3 is a diagram illustrating a relationship between an input detection current, a preset input current limit, and a frequency of the compressor M according to an embodiment of the outdoor unit of an air conditioner of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
[ basic operation principle of air conditioner ]
A refrigeration cycle of an air conditioner includes a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of an air conditioner refers to a portion including a compressor of a refrigeration cycle and includes an outdoor heat exchanger, the indoor unit of an air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit of an air conditioner.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
[ air-conditioner ]
In the present application, an air conditioner mainly relates to an outdoor unit of an air conditioner.
Referring to fig. 1, the outdoor unit of the air conditioner mainly includes a compressor M, IPM (Intelligent Power Module) 10, a PFC circuit 20, a rectifier circuit 30, a current sampling unit 40, and a control unit 50.
The utilization of IPM 10 for frequency conversion control of compressor M is a conventional technical means in frequency conversion control, and will not be described herein.
The power supply device of the air conditioner may include a PFC circuit 20, a rectification circuit 30, and an electrolytic capacitor E1.
Rectifying circuit
The input terminal of the rectifier circuit 30 is connected to a single-phase AC power source AC, and the rectifier circuit 30 is configured to rectify a single-phase AC power supplied from the single-phase AC power source AC to obtain a rectified dc power.
The rectifier circuit 30 is a single-phase bridge rectifier bridge formed by four diodes.
PFC circuit
The PFC circuit 20 is connected between the output terminal of the rectifier circuit 30 and the electrolytic capacitor E1, and the PFC circuit 20 is used for power factor correction of the power supply.
The electrolytic capacitor E1 is connected in parallel with a load, wherein the load can be a compressor M, and the compressor is subjected to frequency conversion control by adopting IPM.
That is, the single-phase AC power supply AC is subjected to uncontrollable full-wave rectification by the rectifier circuit 30, then passes through the PFC circuit 20, and is output to the electrolytic capacitor E1 having a large capacity, thereby supplying power to the load.
It should be noted that the PFC circuit 20 may adopt a boost topology, or of course, may adopt a PFC circuit without a boost function.
Referring to fig. 1, the structure of PFC circuit 20 is shown.
The rectifier circuit 30 has a dc-side positive electrode and a dc-side negative electrode.
PFC circuit 20 includes inductor L1, switching tube IGBT Q1, and diode D1.
The dc side positive electrode of the rectifying circuit 30 is connected to one end of the inductor L1, and the other end of the inductor L1 is divided into two paths.
One path is connected to the collector of the switching tube Q1, and the other path is connected to the anode of the diode D1.
The cathode of the diode D1 is the output terminal of the PFC circuit 20, and the electrolytic capacitor E1 is connected between the cathode of the diode D1 and ground.
The operation principle of the PFC circuit 20 is: the inductor L1 stores energy when the switching tube Q1 is turned on, and charges the stored energy to the large-capacity electrolytic capacitor E1 through the diode D1 when the switching tube Q1 is turned off, and the electrolytic capacitor E1 can output the smoothed and stabilized bus voltage Vdc。
Both the rectifier circuit 30 and the electrolytic capacitor E1 are used in conjunction with the PFC circuit 20.
The PFC circuit 20 may perform a boost process on the rectified dc power while performing a power factor correction on the power supply, so as to provide a stable dc voltage to the electrolytic capacitor E1.
Electric currentSampling unit
Input current I of PFC circuit 20acThe (instantaneous value) can be obtained by sampling by the current sampling unit 40.
Referring to fig. 1, the current sampling unit 40 employs an input current sampling resistor R1 connected in series in the PFC circuit 20, one end of the input current sampling resistor R1 is connected to the emitter of the switching tube Q1, and the other ends are respectively connected to the negative electrode of the dc side of the rectification circuit 30.
The digital current value sampled and acquired by the current sampling unit 40 may be sent to the control unit 50.
The sampled I can be calculated by the calculation unit 53 in the control unit 50acAs an input detection current.
Control unit
The preset input current limit is related to the outdoor ambient temperature.
If the input current is larger and the outdoor environment temperature is larger, the heat generated by the heating device in the circuit is larger, so that in order to reduce the heat generated by the heating device, when the outdoor environment temperature is larger, the corresponding preset input current limit value is set to be small so as to limit the input current.
Therefore, the predetermined input current limit is inversely related to the outdoor ambient temperature.
Namely, if the outdoor environment temperature is high, the preset input current limit value is small; and if the outdoor environment temperature is low, the preset input current limit value is large.
The control unit 50 controls and adjusts the operating frequency of the compressor M according to the input detection current and the preset input current limit value.
When the input detection current is greater than or equal to the preset input current limit value, it indicates that the current input current of the PFC circuit 20 is too large, and at this time, the operating frequency of the compressor M should be limited, and the control unit 50 controls the compressor M to reduce the frequency.
The frequency of the compressor M can be reduced to a certain range and maintained.
When the input detection current is smaller than the preset input current limit value, it indicates that the current input current of the PFC circuit 20 is small, and the frequency of the compressor M should not be reduced, and at this time, the control unit 50 may increase the frequency of the compressor M.
It is possible to maintain the frequency of the compressor M within a range of increasing the frequency.
For better frequency conversion control of the compressor M, the input detection current is limited in sections to more finely control the compressor M.
The preset input current limits include a first preset input current limit I1, a second preset input current limit I2, and a third preset input current limit I3.
Recording: the first predetermined input current limit I1 > the second predetermined input current limit I2 > the third predetermined input current limit I3.
For example, it is possible to set: i2=90% I1, I3=80% I1.
Of course, other proportional relationships among the three can be set according to the sizes of I1, I2 and I3.
When the input detection current is greater than or equal to the first preset input current limit I1, it indicates that the current input current of the PFC circuit 20 is too large, and at this time, the operation frequency of the compressor M should be limited, and the control unit 50 controls the compressor M to forcibly down-convert.
When the input detection current is greater than or equal to the second preset input current limit I2 and less than the first preset input current limit I1, the control unit 50 prohibits the compressor from increasing the frequency, for example, maintaining the current operating frequency or decreasing the frequency.
When the input detection current is greater than or equal to the third preset input current limit I3 and less than the second preset input current limit I2, the control unit 50 controls the compressor M to be allowed to be frequency-up.
When the input detection current is smaller than the third preset input current limit I3, it indicates that the current input current of the PFC circuit 20 is small and the frequency of the compressor M should not be decreased, and at this time, the control unit 50 releases the forced frequency reduction for the compressor M.
< database >
And setting a preset input current limit value corresponding to the outdoor environment temperature, wherein the relation between the preset input current limit value and the preset input current limit value is negative correlation.
For a plurality of different outdoor ambient temperatures TOuter coverThen canTo correspondingly set a plurality of preset input current limit values ILimit value. To form a database with different sets of data.
That is, the database includes, for example, (T)Outer 1，ILimit value of 1）、（TOuter 2，ILimit value of 2）......（TOuter i，ILimit value i）......（TOuter n，ILimit value n）。
The database needs to be set in an early stage and can be obtained through experimental tests.
Wherein T isOuter 1、TOuter 2、......、TOuter i、......、TOuter nRespectively, represent different outdoor ambient temperatures and are ordered in order, e.g., in order from small to large.
ILimit value of 1、ILimit value of 2、...... 、ILimit value i、......、ILimit value nRespectively representing preset input current limit values corresponding to different outdoor environment temperatures.
In the present application, four sets of data are described as an example.
Referring to FIG. 2, four sets of data are (T)Outer 1，ILimit value of 1）、（TOuter 2，ILimit value of 2）、（TOuter 3，ILimit value of 3) And (T)Outer 4，ILimit value of 4）。
It should be noted that two adjacent sets of data are on the same line.
That is, (T)Outer 1，ILimit value of 1）、（TOuter 2，ILimit value of 2) On the same straight line, (T)Outer 2，ILimit value of 2）、（TOuter 3，ILimit value of 3) On the same straight line, (T)Outer 3，ILimit value of 3) And (T)Outer 4，ILimit value of 4) On the same straight line, the slopes of the three straight lines may be different.
< acquisition of outdoor ambient temperature >
The outdoor ambient temperature is acquired by a temperature acquisition unit (not shown), such as a temperature sensor.
The outdoor ambient temperature acquired by the temperature sensor is an analog signal, and therefore, the analog signal needs to be converted into a digital signal by a temperature sampling unit (not shown) for use by the control unit 50.
The sampling time of the temperature sampling unit is the same as that of the current sampling unit 40.
The outdoor ambient temperature does not substantially change over a period of time, and therefore, the average value of the outdoor ambient temperatures sampled over a period of time may be used, or alternatively, the sampled value at a certain time may be used.
< acquisition of preset input Current Limit >
According to the database and the outdoor environment temperature T 'acquired in real time'Outer coverObtaining the outdoor ambient temperature T'Outer coverCorresponding preset input current limit value I'Limit value。
First, the outdoor ambient temperature T 'is compared'Outer coverAnd outdoor ambient temperature T in the databaseOuter 1、TOuter 2、TOuter 3And TOuter 4The size of (2).
If T'Outer coverLess than TOuter 1(i.e., less than T)Outer 1、TOuter 2、TOuter 3And TOuter 4Any one of the above) is set to T'Outer coverCorresponding preset input current limit value I'Limit valueIs TOuter 1Corresponding to ILimit value of 1。
If T'Outer coverIs equal to TOuter 1、TOuter 2、TOuter 3And TOuter 4Any one of, e.g. TOuter 2Then, T 'is set'Outer coverCorresponding preset input current limit value I'Limit valueIs equal to TOuter 2Corresponding to ILimit value of 2。
If T'Outer coverGreater than TOuter 4(i.e., greater than T)Outer 1、TOuter 2、TOuter 3And TOuter 4Any one of the above) is set to T'Outer coverCorresponding preset input current limit value I'Limit valueIs equal to TOuter 4Corresponding to ILimit value of 4。
If T'Outer coverTwo outdoor ambient temperatures, e.g. T, in adjacent group dataOuter 2And TOuter 3In between, T 'is obtained by linear interpolation'Outer coverCorresponding preset input current limit value I'Limit value。
I.e. l'Limit value= ILimit value of 2- (T'Outer cover- TOuter 2)*(ILimit value of 2-ILimit value of 3)/( TOuter 3- TOuter 2)。
From this, the outdoor ambient temperature T 'actually obtained can be obtained'Outer coverCorresponding actual preset input current limit I'Limit value。
Accordingly, the input detection current and the actual preset input current limit I 'can be determined'Limit valueThe compressor M is controlled by frequency conversion.
Referring to fig. 3, a control relationship diagram between the input sensed current, the preset input current limit, and the frequency of the compressor M is shown.
Wherein the preset input current limit comprises a first preset input current limit I'Limit valueAnd a second preset input current limit value of 90% 'I'Limit valueAnd a third preset input current limit of 80% 'I'Limit value。
The different actual outdoor ambient temperatures (i.e., T'Outer 1、T'Outer 2、T'Outer 3And T'Outer 4) The following control manner.
Since the control manner is the same for each outdoor ambient temperature, only at outdoor ambient temperature T'Outer 1The following control method will be described as an example.
Assumed to be equal to the outdoor ambient temperature T 'as above'Outer coverObtaining corresponding actual preset input current limit value I'Limit valueIn the same manner as in (1), T 'has been obtained'Outer 1Corresponding l'Limit value of 1. (as I1')
When the input detection current is greater than or equal to I'Limit value of 1(I1'), the control unit 50 controls the compressor M to be forced down.
The detected current is greater than or equal to 90%'Limit value of 1(denoted as I2 ') and less than I'Limit value of 1When compression is prohibited, the control unit 50 prohibits compressionThe machine is ramped up, e.g., to maintain the current operating frequency or to decrease the frequency.
The detected current is greater than or equal to 80% I'Limit value of 1(denoted as I3 ') and less than 90% ' I 'Limit value of 1When the frequency of the compressor M is allowed to be increased, the control unit 50 controls.
The detected current at the input is less than 90% 'I'Limit value of 1At this time, the control unit 50 releases the forced down-conversion of the compressor M.
Therefore, according to T 'acquired in real time'Outer coverIs correspondingly obtained of'Limit valueThe current and I 'can be detected according to the input'Limit valueThe relationship between the input current and the outdoor environment temperature, that is, the influence of the input current and the outdoor environment temperature on the heating device in the circuit is considered, the frequency of the compressor M is controlled and adjusted, the purpose of reducing the temperature of the heating device in the circuit and the input current is realized, and therefore the working reliability of the PFC circuit 20 and the compressor M is improved.
Referring back to fig. 1, the control unit 50 may include a frequency control module 51 and a PWM driving module 52.
The frequency control module 51 receives preset input current limits I 'of the input detection currents'Limit valueAnd controlling and adjusting the frequency of the modulation wave.
The PWM driving module 52 receives the modulation wave frequency output by the frequency control module 51, and drives and outputs a PWM pulse signal through the PWM driving module 52, where the PWM pulse signal is a pulse signal for controlling the on/off of the switch in the IPM 10, so as to adjust the operating frequency of the compressor M.
The outdoor unit of the air conditioner as described above is applied to the air conditioner, so that the operation reliability of the PFC circuit 20 and the compressor M is achieved by considering the influence of the outdoor ambient temperature on the heat generating device and limiting the input current, thereby improving the operation reliability of the air conditioner.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (8)

1. An outdoor unit of an air conditioner, comprising:
a compressor;
an IPM providing AC power to the compressor;
the output end of the PFC circuit is connected with the input end of the IPM;
a rectifier circuit that outputs a direct current to the PFC circuit;
a current sampling unit for sampling an input current of the PFC circuit;
a control unit which acquires an input detection current according to the sampled input current and controls and adjusts a frequency for the compressor according to the input detection current and a preset input current limit value;
wherein the preset input current limit is inversely related to the outdoor ambient temperature.
2. The outdoor unit of claim 1, wherein the preset input current limits comprise a first preset input current limit, a second preset input current limit, and a third preset input current limit;
the second preset input current limit is a first percentage of the first preset input current limit;
the third preset input current limit is a second percentage of the first preset input current limit;
the first percentage is greater than the second percentage.
3. The outdoor unit of claim 2, wherein the control unit controls and adjusts the frequency for the compressor according to the input detection current, the first preset input current limit, the second preset input current limit, and the third preset input current limit, specifically:
when the input detection current is greater than or equal to the first preset input current limit value, the control unit forcibly reduces the frequency of the compressor;
when the input detection current is greater than or equal to the second preset input current limit value and smaller than the first preset input current limit value, the control unit prohibits the compressor from increasing the frequency;
when the input detection current is greater than or equal to the third preset input current limit value and smaller than the second preset input current limit value, the control unit controls to allow the compressor to increase the frequency;
and when the input detection current is smaller than the third preset input current limit value, the control unit removes the forced frequency reduction of the compressor.
4. The outdoor unit of claim 1, further comprising:
a temperature acquisition unit for acquiring an outdoor ambient temperature in real time;
the temperature sampling unit is used for sampling the outdoor environment temperature in real time;
and the control unit acquires a corresponding preset input current limit value according to the sampled outdoor environment temperature.
5. The outdoor unit of claim 4, wherein the control unit obtains the corresponding preset input current limit value according to the sampled outdoor environment temperature by querying a data table, specifically:
judging the outdoor environment temperature sampled in real time and the outdoor environment temperature in each group of data;
if the outdoor environment temperature sampled in real time is lower than the outdoor environment temperature in any group of data, acquiring a preset input current limit value corresponding to the outdoor environment temperature sampled in real time as a preset input current value corresponding to the minimum outdoor environment temperature;
if the outdoor environment temperature sampled in real time is greater than the outdoor environment temperature in any group of data, acquiring a preset input current limit value corresponding to the outdoor environment temperature sampled in real time as a preset input current value corresponding to the maximum outdoor environment temperature;
if the outdoor environment temperature sampled in real time is between two outdoor environment temperatures in adjacent groups of data, acquiring a preset input current limit value corresponding to the outdoor environment temperature sampled in real time by utilizing linear interpolation;
the data table comprises different groups of data, each group of data comprises outdoor environment temperature and a corresponding preset input current value, the outdoor environment temperature in each group of data is sequenced in sequence, and two adjacent groups of data are on the same straight line.
6. The outdoor unit of claim 4, wherein the input detection current is an average value of the input current sampled by the current sampling unit;
the sampling time of the outdoor environment temperature is the same as that of the current sampling unit.
7. The outdoor unit of claim 1, wherein the control unit comprises:
the frequency control module outputs a modulation wave frequency according to the input detection current and a preset input current limit value;
and the PWM driving module receives the modulation wave frequency and controls and adjusts the PWM pulse signal output to the IPM.
8. An air conditioner, characterized in that the air conditioner comprises: the outdoor unit of an air conditioner according to any one of claims 1 to 7.
CN202110400145.0A 2021-04-14 2021-04-14 Air conditioner outdoor unit and air conditioner Active CN113124501B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113606737A (en) * 2021-08-17 2021-11-05 宁波奥克斯电气股份有限公司 Fan rotating speed control method and device and air conditioner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010037395A (en) * 1999-10-16 2001-05-07 구자홍 inverter air conditioner control Method and apparatus
CN2511909Y (en) * 2001-11-19 2002-09-18 顺德市华傲电子有限公司 Modular frequency converter air-conditioner controller
JP2008202905A (en) * 2007-02-22 2008-09-04 Sharp Corp Air conditioner
CN102937322A (en) * 2012-11-29 2013-02-20 海信（山东）空调有限公司 Rotation speed control method of air conditioner compressor and air conditioner

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010037395A (en) * 1999-10-16 2001-05-07 구자홍 inverter air conditioner control Method and apparatus
CN2511909Y (en) * 2001-11-19 2002-09-18 顺德市华傲电子有限公司 Modular frequency converter air-conditioner controller
JP2008202905A (en) * 2007-02-22 2008-09-04 Sharp Corp Air conditioner
CN102937322A (en) * 2012-11-29 2013-02-20 海信（山东）空调有限公司 Rotation speed control method of air conditioner compressor and air conditioner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113606737A (en) * 2021-08-17 2021-11-05 宁波奥克斯电气股份有限公司 Fan rotating speed control method and device and air conditioner
CN113606737B (en) * 2021-08-17 2022-10-25 宁波奥克斯电气股份有限公司 Fan rotating speed control method and device and air conditioner

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