CN112032978A - Winding induction heating method and system and air conditioning equipment - Google Patents
Winding induction heating method and system and air conditioning equipment Download PDFInfo
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- CN112032978A CN112032978A CN202010857692.7A CN202010857692A CN112032978A CN 112032978 A CN112032978 A CN 112032978A CN 202010857692 A CN202010857692 A CN 202010857692A CN 112032978 A CN112032978 A CN 112032978A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 190
- 238000004804 winding Methods 0.000 title claims abstract description 59
- 230000006698 induction Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004378 air conditioning Methods 0.000 title abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 55
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000020169 heat generation Effects 0.000 description 4
- 230000005291 magnetic effect Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 239000003302 ferromagnetic material Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- F24F11/70—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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Abstract
The invention provides a winding induction heating method and system and air conditioning equipment. The method comprises the steps of testing a compressor control system, fixing heating target power conditions when a compressor is heated, determining different duty ratios corresponding to different direct current bus voltages, and fitting a curve relation between the direct current bus voltages and the duty ratios; when the compressor is heated, detecting the current direct-current bus voltage in a compressor control system in real time, and adjusting the duty ratio according to the established relation between the direct-current bus voltage and the duty ratio and corresponding to the detected current direct-current bus voltage; and performing PWM output control according to the adjusted duty ratio to control the opening time sequence of the power module of the compressor control system and keep the heating power constant when the compressor is heated. The scheme can realize that the duty ratio is adjusted according to voltage fluctuation to control the winding to perform induction heating to keep the heating power constant, avoids overlarge or undersize heating power caused by voltage fluctuation, and has the characteristics of low power consumption, low cost, high reliability and the like.
Description
Technical Field
The invention relates to the technical field of heating control of compressors, in particular to a winding induction heating method and system and air conditioning equipment.
Background
When the air temperature of the air conditioner compressor is low, the refrigerant oil in the compressor can be condensed, and forced starting needs a large moment to correspondingly generate large driving electricity under the condition, so that the permanent magnet in the compressor is demagnetized and fails in starting due to too large heat productivity of a winding, and the problem of overlarge energy consumption exists. In addition, such long term operation can increase compressor wear; when the air temperature is high, the refrigerant liquid in the shell of the compressor is easy to be incompletely evaporated, leaked and blocked under the shutdown state of the refrigerating unit, and the lubrication of the compressor can be damaged. Thus, the air conditioner compressor is appropriately heated to avoid the above-mentioned situation. In addition, in the heating process, the heating power can not be too large or too small, the overheating aging and even demagnetization of the motor coil can be caused by the too large heating power, and the expected heating purpose can not be achieved when the too small heating power is too small.
In the existing compressor heating technology, three modes are mainly included:
1) auxiliary electric heating belt heating: increase an external electric heating area for the compressor, heat through supplying power for the heating area, for open loop control, need increase external electric heating area for the compressor, the cost is higher, and it is efficient low to heat the inside energy consumption of compressor through compressor shell heat-conduction, and the power is different when voltage fluctuation, can not keep heating power/calorific capacity invariable. Even if the compressor is used for a long time, the heating belt is broken due to high temperature, stress and the like, so that the normal operation of the compressor is influenced, and the fire hidden trouble exists.
2) Heating by utilizing the copper loss of a compressor winding: the method is characterized in that a large current is applied to a compressor winding, heat, namely copper loss, is generated through the self resistance of the winding, closed-loop control is adopted, the current flowing through the motor winding is similar to direct current, the duty ratio of a direct current adjusting power module can be detected, the heating power can be ensured to be constant, the loss is generated through the self resistance of the winding through the large current, the power consumption is too large, the power module can generate heat, and the mode is difficult to use for a compressor with large power and small winding resistance.
3) Utilizing the iron loss induction heating of a compressor winding: the high-frequency alternating voltage is applied to the two phases of the compressor, the hysteresis loss and the eddy current loss, namely the iron loss, of the ferromagnetic material of the compressor are increased, the induction heating of the winding is realized, and the constant heating power cannot be ensured for the open-loop control. Compared with the former two modes, the power module has the advantages of small current, small power module loss, high reliability and lower cost. However, since induction heating is mainly based on hysteresis loss and eddy current loss, the loss model is complex and generally difficult to calculate the heating power, and usually depends on experimental data, and the current is small and changes rapidly, which causes difficulty in detection. Under the condition that the voltage of the public power grid is constant, the power device is switched on and off according to a fixed duty ratio under a fixed switching period, and the heating power can be ensured to be constant; in fact, the input voltage of the public network is not constant and fluctuates within a certain range, and under the condition, the power device is switched according to the original duty ratio, and the heating power is still too large or too small (the too large causes overheating aging and demagnetization of the motor coil, and the too small causes the expected heating).
In view of the above drawbacks, a new winding induction heating method is needed, which can conveniently adjust the duty ratio according to the voltage fluctuation under the condition of voltage fluctuation, ensure constant heating power, avoid the excessive or insufficient heating power caused by the voltage fluctuation, and maintain the characteristics of small winding induction current, small power consumption, low cost, strong reliability, and the like.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks, the present invention is proposed to solve or at least partially solve the technical problem of how to adjust the duty ratio according to the voltage fluctuation to control the winding induction heating to keep the heating power constant. In order to solve the technical problems, the invention provides a winding induction heating method, a winding induction heating system and air conditioning equipment.
In a first aspect, a winding induction heating method is provided, including: establishing a relation between the direct current bus voltage and an output control duty ratio by fixing a heating target power condition; and adjusting the detected current actual direct-current bus voltage into a corresponding duty ratio according to the relation, and performing PWM output control according to the duty ratio.
The "establishing a relationship between the dc bus voltage and the output control duty ratio by fixing the heating target power condition" specifically includes: testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different direct current bus voltages, and fitting a curve relation between the direct current bus voltages and the duty ratios.
The method specifically includes the following steps of testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different direct-current bus voltages, and fitting a curve relation between the direct-current bus voltages and the duty ratios: setting a constant heating power as a fixed heating target power condition according to the corresponding compressor model; setting rated direct current bus voltage and a fluctuation range thereof, and setting a plurality of voltage values in the fluctuation range as voltage test conditions; testing the duty ratio value when the constant heating power is reached under each voltage value; and establishing a test coordinate axis, performing point tracing on the corresponding voltage value and the duty ratio value, fitting a curve trend, and determining a curve relation between the direct-current bus voltage and the duty ratio.
Wherein the fluctuation range fluctuates within the range of +/-20% of the rated direct-current bus voltage; the voltage values are evenly distributed in the fluctuation range; and the coordinate axis is plotted with the voltage as the vertical axis and the duty ratio as the horizontal axis.
The "adjusting the detected current actual dc bus voltage to a corresponding duty ratio according to the relationship, and performing PWM output control with the duty ratio" specifically includes: when the compressor is heated, detecting the current direct current bus voltage in a compressor control system in real time; according to the established relation between the direct current bus voltage and the duty ratio, correspondingly detecting the current direct current bus voltage, and adjusting the duty ratio; and performing PWM output control according to the adjusted duty ratio to control the opening time sequence of the power module of the compressor control system and keep the heating power constant when the compressor is heated.
In a second aspect, a winding induction heating system is provided, which specifically includes: the relation module is used for establishing the relation between the direct current bus voltage and the output control duty ratio; and the control module is used for adjusting the detected current actual direct-current bus voltage passing the fixed heating target power condition into a corresponding duty ratio according to the relation, and performing PWM output control on the duty ratio.
The "establishing a relationship between the dc bus voltage and the output control duty ratio by fixing the heating target power condition" specifically includes: testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different direct current bus voltages, and fitting a curve relation between the direct current bus voltages and the duty ratios.
The method specifically includes the following steps of testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different direct-current bus voltages, and fitting a curve relation between the direct-current bus voltages and the duty ratios: setting a constant heating power as a fixed heating target power condition according to the corresponding compressor model; setting rated direct current bus voltage and a fluctuation range thereof, and setting a plurality of voltage values in the fluctuation range as voltage test conditions; testing the duty ratio value when the constant heating power is reached under each voltage value; and establishing a test coordinate axis, performing point tracing on the corresponding voltage value and the duty ratio value, fitting a curve trend, and determining a curve relation between the direct-current bus voltage and the duty ratio.
Wherein the fluctuation range fluctuates within the range of +/-20% of the rated direct-current bus voltage; the voltage values are evenly distributed in the fluctuation range; and the coordinate axis is plotted with the voltage as the vertical axis and the duty ratio as the horizontal axis.
The "adjusting the detected current actual dc bus voltage to a corresponding duty ratio according to the relationship, and performing PWM output control with the duty ratio" specifically includes: when the compressor is heated, detecting the current direct current bus voltage in a compressor control system in real time; according to the established relation between the direct current bus voltage and the duty ratio, correspondingly detecting the current direct current bus voltage, and adjusting the duty ratio; and performing PWM output control according to the adjusted duty ratio to control the opening time sequence of the power module of the compressor control system and keep the heating power constant when the compressor is heated.
In a third aspect, there is provided a computer storage device storing a plurality of program codes adapted to be loaded and run by a processor to perform the aforementioned winding induction heating method.
In a fourth aspect, a control device is provided, comprising a processor and a memory, said memory device being adapted to store a plurality of program codes, said program codes being adapted to be loaded and run by said processor to perform the aforementioned winding induction heating method.
In a fifth aspect, an air conditioning apparatus is provided, which comprises the control system for induction heating of the winding as described above; alternatively, it comprises: a compressor control system and the control device; and a processor of the control device loads a plurality of program codes in a memory and executes any one of the winding induction heating methods, detects the actual direct current bus voltage of the compressor control system in real time and adjusts the corresponding duty ratio according to the established relationship between the direct current bus voltage and the duty ratio so as to perform PWM output control.
The method according to the claim 3, wherein the fluctuation range fluctuates within ± 20% of the rated dc bus voltage; the voltage values are evenly distributed in the fluctuation range; and the coordinate axis is plotted with the voltage as the vertical axis and the duty ratio as the horizontal axis.
Scheme 5 and the method according to scheme 4, wherein the step of adjusting the detected current actual dc bus voltage to a corresponding duty ratio according to the relationship, and performing PWM output control with the duty ratio specifically includes: when the compressor is heated, detecting the current direct current bus voltage in a compressor control system in real time; according to the established relation between the direct current bus voltage and the duty ratio, correspondingly detecting the current direct current bus voltage, and adjusting the duty ratio; and performing PWM output control according to the adjusted duty ratio to control the opening time sequence of the power module of the compressor control system and keep the heating power constant when the compressor is heated.
Scheme 6, a winding induction heating system, its characterized in that specifically includes: the relation module is used for establishing the relation between the direct-current bus voltage and the output control duty ratio by fixing the heating target power condition; and the control module is used for adjusting the detected current actual direct-current bus voltage into a corresponding duty ratio according to the relation and performing PWM output control according to the duty ratio.
Scheme 7 and the system according to scheme 6, wherein the establishing of the relationship between the dc bus voltage and the output control duty ratio by fixing the heating target power condition specifically includes: testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different direct current bus voltages, and fitting a curve relation between the direct current bus voltages and the duty ratios.
Scheme 8 and the system according to scheme 7, wherein the step of testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different dc bus voltages, and fitting a curve relationship between the dc bus voltages and the duty ratios specifically includes: setting a constant heating power as a fixed heating target power condition according to the corresponding compressor model; setting rated direct current bus voltage and a fluctuation range thereof, and setting a plurality of voltage values in the fluctuation range as voltage test conditions; testing the duty ratio value when the constant heating power is reached under each voltage value; and establishing a test coordinate axis, performing point tracing on the corresponding voltage value and the duty ratio value, fitting a curve trend, and determining a curve relation between the direct-current bus voltage and the duty ratio.
Scheme 9, the system of scheme 8, wherein the fluctuation range fluctuates within ± 20% of the rated dc bus voltage; the voltage values are evenly distributed in the fluctuation range; and the coordinate axis is plotted with the voltage as the vertical axis and the duty ratio as the horizontal axis.
The system according to claim 10 and claim 9, wherein the adjusting the detected current actual dc bus voltage to a corresponding duty ratio according to the relationship, and performing PWM output control with the duty ratio specifically includes: when the compressor is heated, detecting the current direct current bus voltage in a compressor control system in real time; according to the established relation between the direct current bus voltage and the duty ratio, correspondingly detecting the current direct current bus voltage, and adjusting the duty ratio; and performing PWM output control according to the adjusted duty ratio to control the opening time sequence of the power module of the compressor control system and keep the heating power constant when the compressor is heated.
Scheme 11, a computer storage device storing a plurality of program codes adapted to be loaded and run by a processor to perform the winding induction heating method of schemes 1-5.
Scheme 12, a control apparatus comprising a processor and a memory, said memory device adapted to store a plurality of program codes, said program codes adapted to be loaded and run by said processor to perform the winding induction heating method of schemes 1-5.
Scheme 13, an air conditioning apparatus, characterized in that the air conditioning apparatus comprises a control system of winding induction heating as in scheme 6-10; alternatively, it comprises: a compressor control system and the control device; the processor of the control device loads a plurality of program codes in the memory and executes any winding induction heating method of schemes 1-5, detects the actual direct current bus voltage of the compressor control system in real time and adjusts the corresponding duty ratio according to the established relationship between the direct current bus voltage and the duty ratio so as to carry out PWM output control.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
according to the technical scheme, the relation between the direct-current bus voltage and the output control duty ratio is established by fixing the heating target power condition; and adjusting the detected current actual direct-current bus voltage into a corresponding duty ratio according to the relation, and performing PWM output control according to the duty ratio. Therefore, the duty ratio of the corresponding heating control is adjusted when the voltage fluctuates, the voltage fluctuation condition in the actual power supply environment is adapted, the duty ratio is rapidly and conveniently adjusted to keep the heating power constant, the complex and tedious experiment that the winding induction maintains the heating power constant in the past and the difficulty of small and fast current detection are avoided, and the technical problem of how to conveniently and effectively adjust the duty ratio to control the heating power to keep the heating power constant according to the voltage fluctuation is solved.
Further, the improved winding induction heating method is improved on the basis of the winding induction heating method, the duty ratio can be adjusted according to the voltage of the direct current bus, the heating power of closed-loop control is adjusted, the constant heating power is ensured, extra devices are not needed to increase the cost, meanwhile, the power consumption is avoided being overlarge, and the closed-loop control is also realized, so that the improved winding induction heating method not only ensures low current, low power consumption, low cost and working stability, but also realizes the closed-loop control and ensures the constant heating power.
Drawings
Embodiments of the invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a principal flow diagram of one embodiment of a winding induction heating method according to the present invention;
FIG. 2 is a block diagram of the structure of one embodiment of a winding induction heating system according to the present invention;
FIG. 3 is a schematic diagram of a compressor control circuit according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of an on timing of a compressor control circuit according to one embodiment of the present disclosure;
fig. 5 is a schematic diagram of an embodiment of establishing a relationship between dc bus voltage and duty ratio according to the present invention.
Detailed Description
For the purpose of facilitating understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and examples, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, a "module" or "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like. The term "a and/or B" denotes all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one A or B" or "at least one of A and B" means similar to "A and/or B" and may include only A, only B, or both A and B. The singular forms "a", "an" and "the" may include the plural forms as well.
Among three known modes of present air conditioning equipment to compressor heating, utilize compressor winding iron loss induction heating to have advantages such as with low costs, low power dissipation, safety and stability, but winding iron loss induction heating's electric current is little and change fast, the iron loss model is found complicacy, and the invariable process of power of generating heat is comparatively complicated loaded down with trivial details through experimental data control. The invention provides a winding induction heating method, a winding induction heating system and air conditioning equipment by improving a winding iron loss induction heating mode, so as to realize closed-loop control of winding induction heating, and conveniently and effectively adjust the duty ratio according to voltage fluctuation to control the heating power to be constant on the basis of not adding any additional device. One embodiment of an aspect of the invention, comprises: under the constant heating target power, establishing the relation between the direct current bus voltage and the duty ratio; when the compressor is subjected to winding induction heating, the duty ratio corresponding to the detected actual direct-current bus voltage is adjusted based on the relation according to the detected actual direct-current bus voltage, so that the heating actual power is basically consistent with the heating target power under the condition that the bus voltage fluctuates.
The following are definitions and explanations of some terms involved in the present invention: (Please supplement the following definitions)
Direct current bus voltage: the load-bearing inverter system is from DC-AC DC voltage.
And (3) output control: refers to the control of the power device.
Duty ratio: the ratio of the power device on time to the switching period.
PWM: the pulse width modulation is an analog control mode, and the bias of a transistor base electrode or an MOS tube grid electrode is modulated according to the change of corresponding load to change the conduction time of the transistor or the MOS tube, so that the change of the output of the switching voltage-stabilized power supply is realized.
Referring to fig. 1, fig. 1 is a main flow chart of one embodiment of a winding induction heating method according to the present invention.
And step S110, establishing the relation between the direct current bus voltage and the output control duty ratio by fixing the heating target power condition.
The relationship between the direct current bus voltage and the output control duty ratio can be established through testing, and the relationship can be a curve relationship obtained through testing; more specifically, during testing, a target heating power of a compressor to be heated used in the test is fixed through an existing compressor control system such as a control circuit, different direct current bus voltages are provided, a required switching timing sequence is determined to output a control duty ratio, the corresponding duty ratio has corresponding output PWM control, the control switching timing sequence can ensure corresponding different direct current bus voltages, the fixed target heating power can be controlled to be output, namely, the heating power is unchanged as an actual value, discrete results of the duty ratios obtained through the test are corresponding to different direct current bus voltages, and a curve (function) is fitted to form a relationship between the direct current bus voltages and the duty ratio. Such as a linear relationship, etc.
The implementation of obtaining the dc bus voltage to duty cycle relationship is described in more detail below with reference to fig. 3, 4, and 5.
Referring to fig. 3, a schematic diagram of a compressor control circuit according to an embodiment of the present invention is shown. In this example of the control circuit, the three-phase ac power input to the compressor permanent magnet motor M is U, V and W, respectively. The figure is divided into three parts, namely direct current bus voltage 1, a power module 2 and a compressor 3.
In one embodiment, the dc bus voltage 1 is denoted by Vdc, P denotes [ positive electrode of the dc bus voltage 1 ], N denotes [ positive electrode of the dc bus voltage 1 ], VT1 to VT6 denote [ switching portion of the power device ], and VD1 to VD6 denote [ diode portion of the power device ].
In particular, control signals may be applied to the compressor 3 by the power module 2, for example: in one switching cycle, in the first 1/2 switching cycles, VT1 is always turned on, VT2 and VT3 are always turned off, and VT4 is turned on according to the time length of the set duty ratio; and in the last 1/2 switching cycles, VT1 and VT4 are always turned off, VT2 is turned on according to the set duty ratio time length, and VT3 is always turned on. As shown in fig. 4, the schematic diagram of the turn-on timing of the compressor control circuit according to an embodiment of the present invention schematically shows the variation of the control signal of the power module 2, where Ts denotes [ power device switching period ], t denotes [ time ], and VT1 to VT6 rectangular blocks denote [ power device turn-on time ].
In one embodiment, taking the above-mentioned turn-on sequence as an example, VT1 turns on in the first 1/2 cycles of one cycle Ts, VT3 turns on in the last 1/2 cycles of one cycle Ts, and the turn-on time is fixed. VT2 and VT4 are on for the same time (i.e., the same length of on time) and at different times (VT4 is on in the first 1/2 cycle and VT2 is on in the last 1/2 cycle). Duty cycle regulation is achieved by adjusting the turn-on times of VT2 and VT4, respectively, in one cycle Ts, the longer the turn-on time, the larger the duty cycle. Otherwise, the larger the duty ratio is, the larger the heat generation power is.
In one embodiment, on the basis of the circuit and the switching sequence, fluctuating direct current bus voltage is provided, and under the condition of fixed heating target power, the relation between the bus voltage corresponding to fluctuation and the duty ratio is tested and obtained.
The following describes in further detail the process of obtaining the relationship between the dc bus voltage and the duty ratio based on the maximum fluctuation range of the allowable operating voltage of the air conditioner compressor as ± 20% of the rated voltage, in conjunction with the above circuit and switch design, by a specific example:
and S1, setting a reasonable heating power Wc according to the corresponding compressor model.
S2, setting a plurality of/N voltage values as voltage test conditions within the range of +/-20% of rated voltage fluctuation. Further, the test voltage may be uniformly distributed within this range. The nominal voltage, i.e. the value of the normal dc bus voltage, corresponds to a constant heating power.
And S3, testing the duty ratio of the reasonable heating power Wc which is set under the condition of each voltage value.
And S4, finishing the test, and performing point drawing by taking the voltage as a horizontal axis and the duty ratio as a vertical axis.
S5, fitting the curve trend as shown in fig. 5, is a schematic diagram of an embodiment of establishing a relationship between dc bus voltage and duty ratio according to the technical solution of the present invention. After the test is completed, the relation between the direct current bus voltage and the duty ratio is determined, namely the relation between the direct current bus voltage and the duty ratio is fitted with a curve, a linear relation between the direct current bus voltage and the duty ratio is established, and preferably, a curve relation between the direct current bus voltage and the duty ratio is established. Further, a curve fitting formula represents the relationship between the direct current bus voltage and the duty ratio. Taking the mitsubishi LNB65FBEMC compressor as an example, when the switching period is 50us, the curve of the constant heating power under different dc bus voltages can be fitted to ton ═ U (real/U)N)2*tNWherein U isNIs the rated voltage, tNIs rated voltage UNNext, the turn-on times of VT2 and VT4 that can satisfy the heat generation target power, urea is the actual voltage, and ton is the turn-on times of VT2 and VT4 that satisfy the heat generation target power under different dc bus voltage regulations.
In one embodiment, the compressor system in the air conditioning equipment generally comprises a control circuit for controlling the compressor, when the compressor is heated, the scheme of the invention does not need to add an additional device, only controls the three-phase voltage input to the compressor through an existing circuit to realize the winding induction heating, and firstly determines the relation between the fluctuating direct current bus voltage and the duty ratio, particularly the fitting linear relation, so that the duty ratio is adjusted through the relation with the duty ratio in the heating process of the compressor when the voltage fluctuates, and the heating power is controlled to keep constant in the PWM output process.
And step S120, adjusting the detected current actual direct current bus voltage into a corresponding duty ratio according to the relation, and performing PWM output control according to the duty ratio.
After the relation between the direct current bus voltage corresponding to the compressor to be heated and the duty ratio is established, the corresponding duty ratio is adjusted by detecting the change condition of the current actual direct current bus voltage in real time when the compressor is heated.
Such as: when the compressor needs to be heated after being started, the current actual direct current bus voltage is detected, the duty ratio corresponding to the actual direct current bus voltage is found according to the curve relation, the duty ratio result is adjusted, PWM output is carried out according to the duty ratio result, the PWM output is controlled, the switching time sequence ensures that high-frequency alternating current voltage is applied to two phases of the compressor and is changed alternately, the hysteresis loss and the eddy current loss of ferromagnetic materials of the compressor are increased, the winding induction heating is realized, particularly the PWM output control is carried out, the heating power is ensured to be kept constant corresponding to the actual direct current bus voltage value.
TABLE 1
In one embodiment, as shown in table 1, taking the mitsubishi LNB65FBEMC compressor as an example, the switching cycle is 50us, and in one switching cycle, VT1 and VT3 are turned on for 25us in the first half cycle and the second half cycle, respectively. The opening time of VT2 and VT4 is correspondingly adjusted according to the detected direct current bus voltage, when the compressor is controlled to heat, the fixed heating target power is 50W, when the direct current bus voltage is detected to be 425V, the opening time of VT2 and VT4 is adjusted to be 14.7us, the duty ratio is 29 percent, and the actual heating power is 51.6W; when detecting that the voltage of the direct current bus is 472V, adjusting the turn-on time of VT2 and VT4 to 12.1us, adjusting the duty ratio to 24 percent and adjusting the actual heating power to 51.0W; when the direct current bus voltage is detected to be 525V, the turn-on time of VT2 and VT4 is adjusted to be 9.8us, the duty ratio is 20 percent, and the actual heating power is 50.4W; when the detected direct current bus voltage is 577V, the turn-on time of VT2 and VT4 is adjusted to 8.0us, the duty ratio is 16%, and the actual heating power is 51.1W; when the direct current bus voltage is 643V, the turn-on time of VT2 and VT4 is adjusted to be 6.7us, the duty ratio is 13%, and the actual heating power is 49.9W. And the output control is changed along with the voltage fluctuation, so that the heating power is kept constant. Therefore, different direct current bus voltage changes are corresponding to different duty ratios, the duty ratios can be changed at any time according to different voltage fluctuations so as to change PWM output control, and constant heating power is always kept as in the case of obtaining the relation between the direct current bus voltage and the duty ratios through tests, so that the constancy of the control heating power is ensured.
According to the scheme, under the condition of voltage fluctuation, the heating power of the compressor winding during induction heating can still be kept constant, the equipment cost does not need to be increased, the power consumption is low, the current is low, the operation is convenient and effective, complex operation and model construction are not needed, the fitting curve relation between the direct current bus voltage and the duty ratio is obtained by testing under the condition that the heating target power is fixed and constant, when the compressor of the air conditioning equipment is heated and controlled, once the voltage fluctuates, the duty ratio can be adjusted according to the direct current bus voltage, the corresponding PWM output control is obtained, and the heating power/the heat release power is ensured to be constant; and the control program can be operated by using the program only in a microprocessor/microcontroller MCU of the air conditioning equipment to realize control signal output, so that the scheme of the invention is realized, the method is effective, convenient and low in cost, constant power closed-loop control is realized, any large power consumption and cost are not needed, and the compressor system, particularly the power module of the compressor system, is not heated to generate extra power consumption.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art will understand that, in order to achieve the effect of the present invention, different steps do not necessarily need to be executed in such a sequence, and they may be executed simultaneously (in parallel) or in other sequences, and these changes are all within the protection scope of the present invention.
Referring now to fig. 2, a block diagram of one embodiment of a winding induction heating system of the present invention is shown. The system at least comprises:
the relation module 210 is configured to establish a relation between the dc bus voltage and the output control duty ratio by fixing the heating target power condition;
the relationship between the direct current bus voltage and the output control duty ratio can be established through testing, and the relationship can be a curve relationship obtained through testing; more specifically, during testing, the heating target power of the compressor to be heated used in the test is fixed through an existing compressor control system, such as a control circuit, different direct current bus voltages are provided, a required switching time sequence is determined to output a control duty ratio, the corresponding duty ratio has corresponding output PWM control, the control switching time sequence can ensure corresponding different direct current bus voltages, the fixed heating target power can be controlled to be output, namely, the heating power is unchanged as an actual value, discrete results of the duty ratios obtained through the test are corresponding to different direct current bus voltages, and a curve (function) is fitted to form a relationship between the direct current bus voltages and the duty ratio. Such as a linear relationship, etc.
The implementation of obtaining the dc bus voltage to duty cycle relationship is described in more detail below with reference to fig. 3, 4, and 5.
Referring to fig. 3, a schematic diagram of a compressor control circuit according to an embodiment of the present invention is shown. In this example of the control circuit, the three-phase ac power input to the compressor permanent magnet motor M is U, V and W, respectively. The figure is divided into three parts, namely direct current bus voltage 1, a power module 2 and a compressor 3.
In one embodiment, the dc bus voltage 1 is denoted by Vdc, P denotes [ positive electrode of the dc bus voltage 1 ], N denotes [ negative electrode of the dc bus voltage 1 ], VT1 to VT6 denote [ switching portion of the power device ], and VD1 to VD6 denote [ diode portion of the power device ].
In particular, control signals may be applied to the compressor 3 by the power module 2, for example: in one switching cycle, in the first 1/2 switching cycles, VT1 is always turned on, VT2 and VT3 are always turned off, and VT4 is turned on according to the time length of the set duty ratio; and in the last 1/2 switching cycles, VT1 and VT4 are always turned off, VT2 is turned on according to the set duty ratio time length, and VT3 is always turned on. As shown in fig. 4, the schematic diagram of the turn-on timing of the compressor control circuit according to an embodiment of the present invention schematically shows the variation of the control signal of the power module 2, where Ts denotes [ power device switching period ], t denotes [ time ], and VT1 to VT6 rectangular blocks denote [ power device turn-on time ].
In one embodiment, taking the above-mentioned turn-on sequence as an example, VT1 turns on in the first 1/2 cycles of one cycle Ts, VT3 turns on in the last 1/2 cycles of one cycle Ts, and the turn-on time is fixed. VT2 and VT4 are on for the same time (i.e., the same length of on time) and at different times (VT4 is on in the first 1/2 cycle and VT2 is on in the last 1/2 cycle). Duty cycle regulation is achieved by adjusting the turn-on times of VT2 and VT4, respectively, in one cycle Ts, the longer the turn-on time, the larger the duty cycle. Otherwise, the larger the duty ratio is, the larger the heat generation power is.
In one embodiment, on the basis of the circuit and the switching sequence, fluctuating direct current bus voltage is provided, and under the condition of fixed heating target power, the relation between the bus voltage corresponding to fluctuation and the duty ratio is tested and obtained.
The following describes in further detail the process of obtaining the relationship between the dc bus voltage and the duty ratio based on the maximum fluctuation range of the allowable operating voltage of the air conditioner compressor as ± 20% of the rated voltage, in conjunction with the above circuit and switch design, by a specific example:
and S1, setting a reasonable heating power Wc according to the corresponding compressor model.
S2, setting a plurality of/N voltage values as voltage test conditions within the range of +/-20% of rated voltage fluctuation. Further, the test voltage may be uniformly distributed within this range. The nominal voltage, i.e. the value of the normal dc bus voltage, corresponds to a constant heating power.
And S3, testing the duty ratio of the reasonable heating power Wc which is set under the condition of each voltage value.
And S4, finishing the test, and performing point drawing by taking the voltage as a horizontal axis and the duty ratio as a vertical axis.
S5, fitting the curve trend as shown in fig. 5, is a schematic diagram of an embodiment of establishing a relationship between dc bus voltage and duty ratio according to the technical solution of the present invention. After the test is completed, the relation between the direct current bus voltage and the duty ratio is determined, namely the relation between the direct current bus voltage and the duty ratio is fitted with a curve, a linear relation between the direct current bus voltage and the duty ratio is established, and preferably, a curve relation between the direct current bus voltage and the duty ratio is established. Further, a curve fitting formula represents the relationship between the direct current bus voltage and the duty ratio. Taking the mitsubishi LNB65FBEMC compressor as an example, when the switching period is 50us, the curve of the constant heating power under different dc bus voltages can be fitted to ton ═ U (real/U)N)2*tNWhere UN is the rated voltage, tN is the rated voltage UN, VT2 and VT4 are the on-times that can meet the target heating power, urea is the actual voltage, and ton is the VT2 and VT4 are the on-times that meet the target heating power under different dc bus voltage regulations.
In one embodiment, the compressor system in the air conditioning equipment generally comprises a control circuit for controlling the compressor, when the compressor is heated, the scheme of the invention does not need to add an additional device, only controls the three-phase voltage input to the compressor through an existing circuit to realize the winding induction heating, and firstly determines the relation between the fluctuating direct current bus voltage and the duty ratio, particularly the fitting linear relation, so that the duty ratio is adjusted through the relation with the duty ratio in the heating process of the compressor when the voltage fluctuates, and the heating power is controlled to keep constant in the PWM output process.
And the control module 220 is configured to adjust the detected current actual dc bus voltage to a corresponding duty ratio according to the relationship, and perform PWM output control with the duty ratio.
After the relation between the direct current bus voltage corresponding to the compressor to be heated and the duty ratio is established, the corresponding duty ratio is adjusted by detecting the change condition of the current actual direct current bus voltage in real time when the compressor is heated.
Such as: when the compressor needs to be heated after being started, the current actual direct current bus voltage is detected, the duty ratio corresponding to the actual direct current bus voltage is found according to the curve relation, the duty ratio result is adjusted, PWM output is carried out according to the duty ratio result, the PWM output is controlled, the switching time sequence ensures that high-frequency alternating current voltage is applied to two phases of the compressor and is changed alternately, the hysteresis loss and the eddy current loss of ferromagnetic materials of the compressor are increased, the winding induction heating is realized, particularly the PWM output control is carried out, the heating power is ensured to be kept constant corresponding to the actual direct current bus voltage value.
TABLE 1
In one embodiment, as shown in table 1, taking the mitsubishi LNB65FBEMC compressor as an example, the switching cycle is 50us, and in one switching cycle, VT1 and VT3 are turned on for 25us in the first half cycle and the second half cycle, respectively. The opening time of VT2 and VT4 is correspondingly adjusted according to the detected direct current bus voltage, when the compressor is controlled to heat, the fixed heating target power is 50W, when the direct current bus voltage is detected to be 425V, the opening time of VT2 and VT4 is adjusted to be 14.7us, the duty ratio is 29 percent, and the actual heating power is 51.6W; when detecting that the voltage of the direct current bus is 472V, adjusting the turn-on time of VT2 and VT4 to 12.1us, adjusting the duty ratio to 24 percent and adjusting the actual heating power to 51.0W; when the direct current bus voltage is detected to be 525V, the turn-on time of VT2 and VT4 is adjusted to be 9.8us, the duty ratio is 20 percent, and the actual heating power is 50.4W; when the detected direct current bus voltage is 577V, the turn-on time of VT2 and VT4 is adjusted to 8.0us, the duty ratio is 16%, and the actual heating power is 51.1W; when the direct current bus voltage is 643V, the turn-on time of VT2 and VT4 is adjusted to be 6.7us, the duty ratio is 13%, and the actual heating power is 49.9W. And the output control is changed along with the voltage fluctuation, so that the heating power is kept constant. Therefore, different direct current bus voltage changes are corresponding to different duty ratios, the duty ratios can be changed at any time according to different voltage fluctuations so as to change PWM output control, and constant heating power is always kept as in the case of obtaining the relation between the direct current bus voltage and the duty ratios through tests, so that the constancy of the control heating power is ensured.
An example of an application scenario of the technical solution of the present invention is described below to further illustrate the implementation of the present invention:
the air conditioner includes a compressor control system, as shown in fig. 3. The compressor control system comprises a permanent magnet motor M (compressor) part 3, wherein the voltage input into the permanent magnet motor M has three phases U, V and W, and the part also has an oil pool. The compressor control system further includes a dc bus voltage Vdc portion 1 connected to an input power terminal, and a power module portion 2. The dc bus voltage Vdc portion 1 applies a control signal to the compressor portion 3 through the power module portion 2 to control the switching of VT1 to VT6, specifically, for example, the switching sequence shown in fig. 4. For example: in one switching cycle, the first 1/2 switching cycles, VT1 is always turned on, VT2 and VT3 are always turned off, and VT4 is turned on according to the time length of the set duty ratio; and in the last 1/2 switching cycles, VT1 and VT4 are always turned off, VT2 is turned on according to the set duty ratio time length, and VT3 is always turned on. VT5 and VT6 are always off. In the on timing of this switch, VT1 and VT3 are turned on at the front and rear 1/2 cycles, respectively. VT2 and VT4 are turned on at different times and have the same turn-on time. Duty cycle regulation can be achieved by adjusting the VT2 and VT4 on-times, with the longer the on-time, the larger the duty cycle. Under the same other conditions, the duty ratio is increased, the current flowing through the winding is increased, the magnetic flux is increased, and the eddy current loss and the hysteresis loss of the winding are in a proportional relationship with the magnetic flux, so that the heating power is increased. In this way, a fluctuating voltage range is set for the compressor, the voltage is evenly distributed under the voltage range, the direct current bus voltage is determined at each voltage value, the turn-on timing sequence under the condition of fixed heating target power is tested, and the duty ratio results, 30%, 50%, 80%, and the like, are determined. And after the test is finished, drawing a corresponding duty ratio value corresponding to the direct current bus voltage value, and fitting a curve relation between the direct current bus voltage value and the duty ratio value. When the air conditioner compressor needs to control heating, the current actual direct current bus voltage value detected in real time is adjusted according to the curve relation, and therefore PWM output control is carried out according to the duty ratio, and the fact that the VT 1-VT 6 switching-on time of the power module part 2 is controlled to change accordingly can be achieved, and the whole heating process can keep a constant heating power.
Further, in an embodiment of a computer storage medium of the present invention, the computer storage medium stores a plurality of program codes adapted to be loaded and executed by a processor to perform any of the aforementioned winding induction heating methods.
Further, in one embodiment of a control apparatus of the present invention, the control apparatus comprises a processor and a memory, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform any of the winding induction heating methods described above. Further, the control device may be, for example, an MCU or the like in an air conditioner.
Further, in an embodiment of an air conditioning apparatus of the present invention, comprising: any of the aforementioned winding induction heating systems; alternatively, it comprises: a compressor control system and the aforementioned control device. Specifically, the processor of the control device loads a plurality of program codes in the memory and executes any one of the aforementioned winding induction heating methods, detects the actual dc bus voltage of the compressor control system in real time and adjusts the corresponding duty ratio according to the established relationship between the dc bus voltage and the duty ratio to perform PWM output control. Further, the PWM output controls the turn-on time sequence of a switch in the power module so as to keep the heating power of the compressor heating constant.
It will be understood by those skilled in the art that all or part of the flow of the method according to the above-described embodiment may be implemented by a computer program, which may be stored in a computer-readable storage medium and used to implement the steps of the above-described embodiments of the method when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
Further, it should be understood that, since the modules are only configured to illustrate the functional units of the system of the present invention, the corresponding physical devices of the modules may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the system may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solutions to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.
So far, the technical solution of the present invention has been described with reference to one embodiment shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A method of winding induction heating, comprising:
establishing a relation between the direct current bus voltage and an output control duty ratio by fixing a heating target power condition;
and adjusting the detected current actual direct-current bus voltage into a corresponding duty ratio according to the relation, and performing PWM output control according to the duty ratio.
2. The method according to claim 1, wherein the establishing a relationship between the dc bus voltage and the output control duty cycle by fixing the heating target power condition specifically comprises:
testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different direct current bus voltages, and fitting a curve relation between the direct current bus voltages and the duty ratios.
3. The method according to claim 2, wherein the step of testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different dc bus voltages, and fitting a curve relationship between the dc bus voltages and the duty ratios specifically comprises:
setting a constant heating power as a fixed heating target power condition according to the corresponding compressor model;
setting rated direct current bus voltage and a fluctuation range thereof, and setting a plurality of voltage values in the fluctuation range as voltage test conditions;
testing the duty ratio value when the constant heating power is reached under each voltage value;
and establishing a test coordinate axis, performing point tracing on the corresponding voltage value and the duty ratio value, fitting a curve trend, and determining a curve relation between the direct-current bus voltage and the duty ratio.
4. The method of claim 3, wherein,
the fluctuation range fluctuates within the range of +/-20% of rated direct current bus voltage;
the voltage values are evenly distributed in the fluctuation range;
and the coordinate axis is plotted with the voltage as the vertical axis and the duty ratio as the horizontal axis.
5. The method according to claim 4, wherein the step of adjusting the detected current actual dc bus voltage to a corresponding duty ratio according to the relationship, and performing PWM output control with the duty ratio specifically includes:
when the compressor is heated, detecting the current direct current bus voltage in a compressor control system in real time;
according to the established relation between the direct current bus voltage and the duty ratio, correspondingly detecting the current direct current bus voltage, and adjusting the duty ratio;
and performing PWM output control according to the adjusted duty ratio to control the opening time sequence of the power module of the compressor control system and keep the heating power constant when the compressor is heated.
6. A winding induction heating system, characterized by specifically comprising:
the relation module is used for establishing the relation between the direct-current bus voltage and the output control duty ratio by fixing the heating target power condition;
and the control module is used for adjusting the detected current actual direct-current bus voltage into a corresponding duty ratio according to the relation and performing PWM output control according to the duty ratio.
7. The system according to claim 6, wherein the establishing a relationship between the dc bus voltage and the output control duty cycle by fixing the heating target power condition specifically includes:
testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different direct current bus voltages, and fitting a curve relation between the direct current bus voltages and the duty ratios.
8. The system of claim 7, wherein the step of testing a compressor control system, fixing a heating target power condition when the compressor is heated, determining different duty ratios corresponding to different dc bus voltages, and fitting a curve relationship between the dc bus voltages and the duty ratios specifically comprises:
setting a constant heating power as a fixed heating target power condition according to the corresponding compressor model;
setting rated direct current bus voltage and a fluctuation range thereof, and setting a plurality of voltage values in the fluctuation range as voltage test conditions;
testing the duty ratio value when the constant heating power is reached under each voltage value;
and establishing a test coordinate axis, performing point tracing on the corresponding voltage value and the duty ratio value, fitting a curve trend, and determining a curve relation between the direct-current bus voltage and the duty ratio.
9. The system of claim 8, wherein,
the fluctuation range fluctuates within the range of +/-20% of rated direct current bus voltage;
the voltage values are evenly distributed in the fluctuation range;
and the coordinate axis is plotted with the voltage as the vertical axis and the duty ratio as the horizontal axis.
10. The system according to claim 9, wherein the step of adjusting the detected current actual dc bus voltage to a corresponding duty ratio according to the relationship, and performing PWM output control with the duty ratio specifically includes:
when the compressor is heated, detecting the current direct current bus voltage in a compressor control system in real time;
according to the established relation between the direct current bus voltage and the duty ratio, correspondingly detecting the current direct current bus voltage, and adjusting the duty ratio;
and performing PWM output control according to the adjusted duty ratio to control the opening time sequence of the power module of the compressor control system and keep the heating power constant when the compressor is heated.
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Application publication date: 20201204 |
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