Electric control system and control method thereof, storage medium, electrical equipment and air conditioner

Abstract

The invention discloses an electric control system and a control method thereof, a storage medium, electrical equipment and an air conditioner, the system comprises a plurality of electric control units, each electric control unit comprises a controllable switch, and the method comprises the steps that a plurality of frequencies corresponding to each target electric control unit in a plurality of target electric control units in a current control period are obtained, the electric control unit comprises a target electric control unit, and the multiple frequencies comprise the switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency; and when at least one of the plurality of frequencies corresponding to any two target electronic control units is the same, adjusting the switching frequency corresponding to at least one of any two target electronic control units, so that the plurality of frequencies corresponding to any two target electronic control units are different. According to the method, in the process of driving the controllable switches, the frequencies of any two target electric control units are different, so that frequency coupling superposition between different controllable switches is avoided, and the EMC of the electric control system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a control method of an electric control system, a computer-readable storage medium, an electric control system, an electrical equipment and an air conditioner. Background Art

[0002] In the related art, the electric control system of the outdoor unit of the air conditioner mainly includes: the compressor control part, the fan drive control part and the power factor correction part. The compressor and the fan are both controlled by a three-phase inverter drive system, and the power factor correction unit is implemented by a boost type PFC (Power Factor Correction) circuit.

[0003] The above three parts all involve PWM (Pulse width modulation) modulation technology, which uses PWM signals to control the on and off of the controllable switches in the compressor control part, the fan drive control part, and the power factor correction part. However, the on and off of high-frequency switches will generate electromagnetic interference. At the same time, as the power density of the electric control increases, and the switching frequencies between different parts are coupled and superimposed to a certain extent, the energy of electromagnetic interference will be further aggravated, leading to more serious EMC (Electromagnetic Compatibility) problems. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first object of the present invention is to provide a control method for an electric control system, in which, in the process of driving a controllable switch, when at least one frequency among multiple frequencies corresponding to any two target electric control units is the same, the switching frequency corresponding to the corresponding target electric control unit is adjusted so that the frequencies of the any two target electric control units are different, thereby avoiding frequency coupling superposition between different controllable switches and making the electric control system meet the EMC requirements.

[0005] A second object of the present invention is to provide a computer-readable storage medium.

[0006] The third objective of the present invention is to provide an electronic control system.

[0007] A fourth objective of the present invention is to provide an electrical device.

[0008] A fifth object of the present invention is to provide an air conditioner.

[0009] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a control method for an electric control system, the system includes multiple electric control units, each electric control unit includes a controllable switch, and the control method for the electric control system includes: obtaining multiple frequencies corresponding to each target electric control unit among multiple target electric control units in a current control cycle, wherein the electric control unit includes a target electric control unit, and the multiple frequencies include a switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency; when at least one frequency is the same among the multiple frequencies corresponding to any two target electric control units, adjusting the switching frequency corresponding to at least one target electric control unit among any two target electric control units so that the multiple frequencies corresponding to any two target electric control units are different.

[0010] According to the control method of the electric control system of the embodiment of the present invention, first, multiple frequencies corresponding to each target electric control unit in multiple target electric control units in the current control cycle are obtained, wherein the electric control unit includes a target electric control unit, and the multiple frequencies include the switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency, and when at least one frequency is the same among the multiple frequencies corresponding to any two target electric control units, the switching frequency corresponding to at least one target electric control unit in any two target electric control units is adjusted so that the multiple frequencies corresponding to any two target electric control units are different. Therefore, in the process of driving the controllable switch, when at least one frequency is the same among the multiple frequencies corresponding to any two target electric control units, the switching frequency corresponding to the corresponding target electric control unit is adjusted so that the frequencies of the any two target electric control units are different, thereby avoiding the frequency coupling superposition between different controllable switches, so that the EMC of the electric control system meets the requirements.

[0011] In addition, the control method of the electric control system according to the above embodiment of the present invention may also have the following additional technical features:

[0012] According to an embodiment of the present invention, each electronic control unit has a corresponding switching frequency range, and the switching frequency corresponding to each target electronic control unit is obtained from the corresponding switching frequency range.

[0013] According to an embodiment of the present invention, the multiple target ECUs are ECUs whose frequency spectra overlap among the multiple ECUs, wherein the frequency spectrum is determined according to a switching frequency range and a harmonic frequency range corresponding to the switching frequency range.

[0014] According to an embodiment of the present invention, adjusting the switching frequency corresponding to at least one of any two target electronic control units includes: adjusting the switching frequency corresponding to at least one of any two target electronic control units to the switching frequency corresponding to the previous control cycle.

[0015] According to one embodiment of the present invention, multiple target electronic control units include a power factor correction unit, a compressor drive unit and a fan drive unit, wherein the output end of the power factor correction unit is connected to the input end of the compressor drive unit and the input end of the fan drive unit, respectively, and the control method of the electronic control system also includes: obtaining the input voltage, output voltage and first working current of the power factor correction unit, the second working current of the compressor drive unit and the third working current of the fan drive unit; based on the input voltage, output voltage, first working current, second working current and third working current, obtaining the corresponding switching frequency from the corresponding switching frequency range of each target electronic control unit.

[0016] According to one embodiment of the present invention, when the frequency spectrum corresponding to the fan drive unit overlaps with the frequency spectrum corresponding to the compressor drive unit and the frequency spectrum corresponding to the power factor correction unit, and the frequency spectrum corresponding to the compressor drive unit does not overlap with the frequency spectrum corresponding to the power factor correction unit, the priority of adjusting the switching frequency corresponding to the fan drive unit is higher than the priority of adjusting the switching frequencies corresponding to the compressor drive unit and the power factor correction unit.

[0017] To achieve the above objectives, a second aspect of the present invention provides a computer-readable storage medium on which a control program of an electric control system is stored. When the control program of the electric control system is executed by a processor, the control method of the electric control system is implemented.

[0018] According to the computer-readable storage medium of an embodiment of the present invention, the control method of the electric control system is implemented when the control program of the electric control system is executed by the processor. Based on the control method of the electric control system, in the process of driving the controllable switch, when at least one frequency among the multiple frequencies corresponding to any two target electric control units is the same, the switching frequencies corresponding to the corresponding target electric control units are adjusted so that the frequencies of the any two target electric control units are different, thereby avoiding the frequency coupling and superposition between different controllable switches and improving the EMC of the electric control system.

[0019] To achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention proposes an electronic control system, comprising: multiple electronic control units, each electronic control unit comprising a controllable switch; an acquisition unit, used to acquire multiple frequencies corresponding to each target electronic control unit among multiple target electronic control units in a current control cycle, wherein the electronic control unit includes a target electronic control unit, and the multiple frequencies include a switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency; a control unit, used to adjust the switching frequency corresponding to at least one target electronic control unit among any two target electronic control units when at least one frequency among the multiple frequencies corresponding to any two target electronic control units is the same, so that the multiple frequencies corresponding to any two target electronic control units are different.

[0020] According to the electric control system of the embodiment of the present invention, each electric control unit includes a controllable switch, and a plurality of frequencies corresponding to each target electric control unit in a plurality of target electric control units in the current control cycle are obtained by an acquisition unit, wherein the electric control unit includes a target electric control unit, and the plurality of frequencies include a switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency. When at least one frequency is the same among the plurality of frequencies corresponding to any two target electric control units, the control unit adjusts the switching frequency corresponding to at least one target electric control unit in any two target electric control units, so that the plurality of frequencies corresponding to any two target electric control units are different. Thus, in the process of driving the controllable switch, when at least one frequency is the same among the plurality of frequencies corresponding to any two target electric control units, the electric control system adjusts the switching frequency corresponding to the corresponding target electric control unit, so that the frequencies of the any two target electric control units are different, thereby avoiding the frequency coupling superposition between different controllable switches, and making the EMC of the electric control system meet the requirements.

[0021] To achieve the above-mentioned purpose, a fourth aspect of the present invention provides an electrical device, including the above-mentioned electric control system.

[0022] According to the electrical equipment of an embodiment of the present invention, based on the above-mentioned electrical control system, in the process of driving the controllable switch, when at least one frequency among the multiple frequencies corresponding to any two target electrical control units is the same, the switching frequencies corresponding to the corresponding target electrical control units are adjusted so that the frequencies of the any two target electrical control units are different, thereby avoiding the frequency coupling and superposition between different controllable switches, making the EMC of the electrical control system meet the requirements, and ensuring the working stability of the electrical equipment.

[0023] To achieve the above-mentioned purpose, the fifth aspect of the present invention proposes an air conditioner, including a memory, a processor, and a control program of an electronic control system stored in the memory and executable on the processor. When the processor executes the control program of the electronic control system, the control method of the electronic control system is implemented.

[0024] According to the air conditioner of the embodiment of the present invention, the control program of the electric control system runs on the processor, and when the processor executes the control program of the electric control system, the control method of the electric control system is implemented. Based on the control method of the electric control system, in the process of driving the controllable switch, when at least one frequency among the multiple frequencies corresponding to any two target electric control units is the same, the switching frequencies corresponding to the corresponding target electric control units are adjusted so that the frequencies of the any two target electric control units are different, thereby avoiding the frequency coupling and superposition between different controllable switches, so that the EMC of the electric control system meets the requirements, and the working stability of the air conditioner is further guaranteed.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of a control method of an electronic control system according to an embodiment of the present invention;

[0027] Figure 2 is a circuit diagram of an electric control system according to a specific embodiment of the present invention;

[0028] Figure 3 is a circuit diagram of a compressor driving unit according to an embodiment of the present invention;

[0029] Figure 4 is a circuit diagram of a fan drive unit according to an embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of a frequency generation module according to an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of a spectrum of a power factor correction unit, a fan drive unit and a compressor drive unit according to an embodiment of the present invention;

[0032] Figure 7 is a block diagram of an electric control system according to an embodiment of the present invention;

[0033] Figure 8 is a block diagram of an electrical device according to an embodiment of the present invention;

[0034] Fig. 9 FIG. 4 is a block diagram of an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] The following describes a control method of an electric control system, a computer-readable storage medium, an electric control system, an electrical device, and an air conditioner according to embodiments of the present invention with reference to the accompanying drawings.

[0037] Figure 1 4 is a flow chart of a control method of an electronic control system according to an embodiment of the present invention.

[0038] In one embodiment of the present invention, the electric control system includes a plurality of electric control units, and each electric control unit includes a controllable switch.

[0039] Specifically, Figure 2 Taking the electric control system shown in FIG. 1 as an example, the electric control system includes a rectifier unit 11, a power factor correction unit 12, a compressor drive unit 13 and a motor drive unit 14, wherein the power factor correction unit 12, the compressor drive unit 13 and the motor drive unit 14 are multiple electric control units of the electric control system, the power factor correction unit 12 includes a controllable switch S1, and the specific topology of the compressor drive unit 13 is as follows: Figure 3 As shown, the controllable switches VT1 to VT6 are included, and the specific topology of the fan drive unit 14 is as follows Figure 4 The shown embodiment includes controllable switches ST1 to ST6.

[0040] The switching frequency corresponding to the controllable switches in the above modules is given by Figure 5 The frequency generation module 15 shown is generated, and the input of the frequency generation module 15 is the sampled bus voltage, the input voltage of the power factor correction unit 12, the inductor current of the power factor correction unit 12, the compressor bus current and the fan bus current. The output of the frequency generation module 15 is the switching frequency of the power factor correction unit 12 (to drive the controllable switch S1), the switching frequency of the compressor drive unit 13 (to drive the controllable switches VT1~VT6), and the switching frequency of the fan drive unit 14 (to drive the controllable switches ST1~ST6), wherein the PWM speed regulation of the compressor 15 can be achieved by the switching frequency of the compressor drive unit 14, and the PWM speed regulation of the fan 16 can be achieved by the switching frequency of the fan drive unit 15. It should be noted that the inductor current of the power factor correction unit 12 can be sampled and obtained through the first resistor R1, the compressor bus current 13 can be sampled and obtained through the second resistor R2, and the fan bus current 14 can be sampled and obtained through the third resistor R3. The connection of the sampling resistors is specifically referred to. Figure 2-Figure 4 shown.

[0041] Since the energy of electromagnetic interference is concentrated on the switching frequency and its multiples, the corresponding spectrum can be changed by controlling the switching frequency, thereby changing the energy distribution of electromagnetic interference and ultimately improving the EMC of the electronic control system. In related technologies, PWM random switching modulation technology and PWM frequency jitter control technology are used to improve the EMC of the electronic control system.

[0042] Although the above technical solutions can achieve a certain EMC improvement effect, the complexity of the electric control system and the diversification of switches have increased the difficulty of EMC rectification. For example, when there are multiple electric control units with controllable switches in the air conditioner outdoor system, different controllable switches are required to drive the electric control units. These controllable switches have different switching frequencies. These frequencies are coupled and superimposed to a certain extent, which will further increase the energy of electromagnetic interference, thereby causing more serious EMC problems.

[0043] Therefore, the switching frequency technology of controlling a single device can no longer meet the EMC requirements of the system. This application proposes a control method for an electric control system, which is based on the variable control of the switching frequency of multiple controllable switches, and achieves the goal of modulating all switching frequencies while avoiding the superposition of different switching frequencies, so that the EMC of the electric control system meets the requirements.

[0044] like Figure 1 As shown, the control method of the electric control system of the embodiment of the present invention may include:

[0045] S1, obtaining multiple frequencies corresponding to each target electronic control unit in multiple target electronic control units in the current control cycle, wherein the electronic control unit includes the target electronic control unit, and the multiple frequencies include a switching frequency of a controllable switch and multiple harmonic frequencies corresponding to the switching frequency;

[0046] S2, when at least one frequency among the multiple frequencies corresponding to any two target electronic control units is the same, adjusting the switching frequency corresponding to at least one of the any two target electronic control units so that the multiple frequencies corresponding to the any two target electronic control units are different.

[0047] This control method only controls the target ECU, which can be pre-specified according to the working requirements or adjusted based on the working parameters of the module. Figure 2 In the electronic control system shown, only the power factor correction unit and the compressor drive unit can be used as target electronic control units to perform the following multi-frequency comparison and switching frequency adjustment actions, or the power factor correction unit, the compressor drive unit and the fan drive unit 14 can all be used as target electronic control units.

[0048] First, based on the PWM signals corresponding to multiple target electronic control units in the current control cycle, the switching frequency of the controllable switch corresponding to each target electronic control unit can be determined, and then based on the preset harmonic order, the multiple harmonic frequencies corresponding to the switching frequency can be determined. For example, if the switching frequency of the controllable switch is determined to be F, and the preset harmonic order is 3, then the multiple frequencies of the target electronic control unit include: switching frequency F, 2nd harmonic frequency 2F, and 3rd harmonic frequency 3F. The harmonic order can be set according to the impact of multiple harmonics on the work during actual operation.

[0049] Then, multiple frequencies of each target electronic control unit are compared to determine whether there is a situation where the multiple frequencies corresponding to any two target electronic control units are the same, and further adjust the switching frequency of the target electronic control unit with the same frequency so that the multiple frequencies corresponding to them are different. Taking the switching frequency of the first target electronic control unit and the second target electronic control unit as an example, after determining that the switching frequency of the first target electronic control unit is equal to the second harmonic frequency of the second target electronic control unit, the switching frequency of the first target electronic control unit in the first target electronic control unit and the second target electronic control unit is adjusted, or the switching frequency of the second target electronic control unit is adjusted, or the switching frequency of the first target electronic control unit and the second target electronic control unit are adjusted, for example, the switching frequency of the first target electronic control unit is controlled to increase the preset frequency, and the switching frequency of the second target electronic control unit is controlled to decrease the preset frequency, so that the adjusted first target electronic control unit and the second target electronic control unit do not have the same frequency, avoid the mutual superposition of the spectrum of the first target electronic control unit and the second target electronic control unit, reduce electromagnetic interference, and improve the EMC of the electronic control system.

[0050] It should be noted that the switching frequency may be adjusted by increasing the switching frequency by a preset frequency, or by decreasing the switching frequency by a preset frequency, or by adjusting the switching frequency according to a preset coefficient, which is not limited here.

[0051] In one embodiment of the present invention, each electronic control unit has a corresponding switching frequency range, and the switching frequency corresponding to each target electronic control unit is obtained from the corresponding switching frequency range.

[0052] First, a corresponding initial switching frequency is pre-set according to the target electronic control unit, and a corresponding switching frequency range is determined according to the initial switching frequency. The switching frequency corresponding to each target electronic control unit is controlled to change within the corresponding switching frequency range according to the preset control frequency based on the PWM frequency jittering technology. For example, the switching frequency can be controlled to increase step by step within the corresponding switching frequency range, or the switching frequency can be controlled to decrease step by step within the corresponding switching frequency range.

[0053] Specifically, continue with Figures 2 to 5 Taking the electronic control system shown as an example, it is assumed that the initial switching frequency of the compressor drive unit 13 is X, the initial switching frequency of the fan drive unit 14 is Y, and the initial switching frequency of the power factor correction unit 12 is Z.

[0054] When the initial switching frequency of the compressor drive unit 13 is determined to be X based on the above calculation, the switching frequency range corresponding to the compressor drive unit 13 is determined to be [X-ΔX, X+ΔX], where ΔX is the preset switching frequency variation amplitude of the compressor drive unit 13. The switching frequency X of the compressor drive unit 13 is calculated and updated in each control cycle.k , so that the switching frequency X k In the same way, when the initial switching frequency of the fan drive unit 14 is determined to be Y, the switching frequency range corresponding to the fan drive unit 14 is determined to be [Y-ΔY, Y+ΔY], where ΔY is the preset switching frequency variation of the fan drive unit 14. The switching frequency Y of the fan drive unit 14 is calculated and updated in each control cycle. k , so that the switching frequency Y k When the initial switching frequency of the power factor correction unit 12 is determined to be Z, the switching frequency range corresponding to the power factor correction unit 12 is determined to be [Z-ΔZ, Z+ΔZ], where ΔZ is the preset switching frequency variation amplitude of the power factor correction unit 12. The switching frequency Z of the power factor correction unit 12 is calculated and updated in each control cycle. k , so that the switching frequency Z k Change within the range of [Z-ΔZ, Z+ΔZ]. Thus, the switching frequencies of the compressor drive unit 13, the fan drive unit 14 and the power factor correction unit 12 are changed with X, Y, and Z as the center frequencies, so that the interference signals generated by them will not be concentrated on a certain fixed frequency, but will be extended to a certain frequency range, thereby reducing the electromagnetic interference of the target electronic control unit at a certain fixed frequency point.

[0055] In one embodiment of the present invention, the multiple target ECUs are ECUs whose frequency spectra overlap among the multiple ECUs, wherein the frequency spectrum is determined according to a switching frequency range and a harmonic frequency range corresponding to the switching frequency range.

[0056] Specifically, taking the initial switching frequency of the compressor drive unit 13 as X and determining the switching frequency range corresponding to the compressor drive unit 13 as [X-ΔX, X+ΔX] as an example, then, taking X as the fundamental frequency, the ath harmonic is aX, and the frequency range of the ath harmonic caused by the fundamental frequency change is [aX-aΔX, aX+aΔX], and the frequency spectrum of the compressor drive unit 13 is:

[0057] [X-ΔX, X+ΔX], [2X-ΔX, 2X+ΔX], ..., [aX-aΔX, aX+aΔX]

[0058] Similarly, when the initial switching frequency of the fan drive unit 14 is Y, the switching frequency range corresponding to the fan drive unit 14 is determined to be [Y-ΔY, Y+ΔY] as an example. Then, taking Y as the b-th harmonic of the fundamental frequency as bY, the frequency range of the b-th harmonic caused by the change of the fundamental frequency is [bY-bΔY, bY+bΔY], and the frequency spectrum of the fan drive unit 14 is:

[0059] [Y - ΔY, Y + ΔY], [2Y - 2ΔY, 2Y + 2ΔY], ……, [bY - bΔY, bY + bΔY]

[0060] Taking the initial switching frequency of the power factor correction unit 12 as Z and determining the switching frequency range corresponding to the power factor correction unit 12 as [Z - ΔZ, Z + ΔZ] as an example, then, the c-th harmonic with Z as the fundamental frequency is cZ. The frequency range of the c-th harmonic caused by the change of the fundamental frequency is [cZ - cΔZ, cZ + cΔZ]. Then, the spectrum of the power factor correction unit 12 is:

[0061] [Z - ΔZ, Z + ΔZ], [2Z - 2ΔZ, 2Z + 2ΔZ], ……, [cZ - cΔZ, cZ + cΔZ]

[0062] The schematic diagram of the spectrum coincidence in the above three electronic control units is as Figure 6 , where the relationship of the initial switching frequencies is X < Y < Z. In Figure 6 , the overlapping part is indicated by a diagonal line. Based on Figure 6 shown, there is an overlap between the spectrum of the compressor drive unit 13 and the spectrum of the fan drive unit 14, and there is an overlap between the spectrum of the fan drive unit 14 and the spectrum of the power factor correction unit 12. That is to say, during the process of adjusting the switching frequencies of the power factor correction unit 12, the compressor drive unit 13, and the fan drive unit 14, it is possible that the frequencies of the compressor drive unit 13 and the fan drive unit 14 are equal, or the frequencies of the power factor correction unit 12 and the fan drive unit 14 are equal. Therefore, the power factor correction unit 12, the compressor drive unit 13, and the fan drive unit 14 are set as the target electronic control units.

[0063] When the frequency of an electronic control unit does not overlap with the frequencies of other electronic control units in the electronic control system, that is, during the process of adjusting the switching frequency of this electronic control unit, there will be no situation where the stored frequencies are equal to those of other electronic control units. Therefore, it is not necessary to obtain the control frequency of this electronic control unit and perform subsequent judgment processes during the control process, thereby simplifying the control method and improving the regulation efficiency.

[0064] In an embodiment of the present invention, adjusting the switching frequency corresponding to at least one of any two target electronic control units includes: adjusting the switching frequency corresponding to at least one of any two target electronic control units to the switching frequency corresponding to the previous control cycle.

[0065] For example, assuming that the initial switching frequency of the fan drive unit is 14K, and the switching frequency range is [14K-1K, 14K+1K], then the 2nd harmonic frequency range of the fan drive unit is [26K, 30K], the 3rd frequency range is [39K, 45K], and the switching frequency change step of each control cycle is 0.2K. The initial switching frequency of the power factor correction unit is 40K, and the switching frequency range is [40K-2, 40K+2], then the 2nd harmonic frequency range of the power factor correction unit is [76K, 84K], where the switching frequency change step of each control cycle is 0.2K.

[0066] Assume that the switching frequency Y of the fan drive unit in the current control cycle k is k =14K, then its third harmonic frequency is 42K. If the switching frequency of the power factor correction unit in the current control cycle k is Z k =42K. Then in the current control cycle k, the switching frequency of the power factor correction unit is equal to the third harmonic frequency of the fan drive unit, and the switching frequency of the power factor correction unit is adjusted to the previous control cycle, Z k =Z k-1 =40K-0.2K=41.8K, so that there is no frequency equality between the adjusted power factor correction unit and the fan drive unit.

[0067] In one embodiment of the present invention, multiple target electronic control units include a power factor correction unit, a compressor drive unit and a fan drive unit, wherein the output end of the power factor correction unit is connected to the input end of the compressor drive unit and the input end of the fan drive unit, respectively, and the control method of the electronic control system also includes: obtaining the input voltage, output voltage and first working current of the power factor correction unit, the second working current of the compressor drive unit and the third working current of the fan drive unit; based on the input voltage, output voltage, first working current, second working current and third working current, obtaining the corresponding switching frequency from the corresponding switching frequency range of each target electronic control unit.

[0068] The circuit connections of the power factor correction unit, compressor drive unit and fan drive unit can refer to Figures 2 to 4 As shown, no further description is given here.

[0069] by Figure 2-Figure 4For example, the input voltage of the power factor correction unit 12 and the output voltage of the power factor correction unit 12 can be obtained through the voltage detection unit, and the inductor current of the power factor correction unit is sampled through the first resistor R1 as the first working current of the power factor correction unit 12. The compressor bus current is sampled through the second resistor R2 as the second working current of the compressor drive unit 13. The fan bus current is sampled through the third resistor R3 as the third working current of the fan drive unit 13, and then the corresponding initial switching frequency is generated in combination with the above parameters, and the switching frequency range is further determined, and then the corresponding switching frequency is obtained according to the preset control period and the change step of the switching frequency.

[0070] In one embodiment of the present invention, when the frequency spectrum corresponding to the fan drive unit overlaps with the frequency spectrum corresponding to the compressor drive unit and the frequency spectrum corresponding to the power factor correction unit, and the frequency spectrum corresponding to the compressor drive unit does not overlap with the frequency spectrum corresponding to the power factor correction unit, the priority of adjusting the switching frequency corresponding to the fan drive unit is higher than the priority of adjusting the switching frequencies corresponding to the compressor drive unit and the power factor correction unit.

[0071] Specifically, the frequency generation module generates the switching frequency of the current control cycle. Assuming that in the current control cycle, the switching frequency of the compressor driving unit 13 is X k , the switching frequency of the fan drive unit 14 is Y k , the switching frequency of the power factor correction unit 12 is Z k .

[0072] First, the switching frequency X of the compressor drive unit 13 is calculated. k The corresponding frequency spectrum of 1 to a times, the switching frequency Y of the fan drive unit 14 k The corresponding 1~b frequency spectrum, if there is a1X k =b1Y k , that is, there are two equal frequencies, then the switching frequency Y of the fan drive unit 14 is controlled k =Y k-1 , that is, the switching frequency of the fan drive unit 14 maintains the output value of the previous control cycle, and then the adjusted switching frequency of the fan drive unit 14, that is, Y k-1 Determine the corresponding 1 to b frequency spectra, and compare the adjusted determined frequency spectrum with the power factor correction unit 12; if there are no two equal frequencies between the compressor drive unit 13 and the fan drive unit 14, control the switching frequencies of the compressor drive unit 13 and the fan drive unit 14 to remain unchanged, and further compare the multiple frequencies corresponding to the fan drive unit 14 and the power factor correction unit 12.

[0073] The switching frequency of the power factor correction unit 12 is calculated as Z k The corresponding 1 to c frequency spectra are compared with the frequency spectra of the fan drive unit 14 and the power factor correction unit 12. If it is determined that there is an equal frequency between the fan drive unit 14 and the power factor correction unit 12, such as b1Y k =c1Z k , the fan drive unit 14 is preferentially controlled to maintain the switching frequency input of the previous control cycle. In the current control cycle, when the switching frequency of the fan drive unit 14 has been adjusted, the switching frequency of the power factor correction unit 12 is adjusted, that is, the switching frequency Z of the power factor correction unit 12 is controlled. k =Z k-1 , that is, the switching frequency of the power factor correction unit 12 maintains the output value of the previous control cycle. Wherein, a1 is any harmonic of X from 1st to ath order, b1 is any harmonic of Y from 1st to bth order, and c1 is any harmonic of Z from 1st to cth order.

[0074] In summary, according to the control method of the electric control system of the embodiment of the present invention, first, multiple frequencies corresponding to each target electric control unit in multiple target electric control units in the current control cycle are obtained, wherein the electric control unit includes a target electric control unit, and the multiple frequencies include the switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency, and when at least one frequency is the same among the multiple frequencies corresponding to any two target electric control units, the switching frequency corresponding to at least one target electric control unit in any two target electric control units is adjusted so that the multiple frequencies corresponding to any two target electric control units are different. Therefore, in the process of driving the controllable switch, when at least one frequency is the same among the multiple frequencies corresponding to any two target electric control units, the switching frequency corresponding to the corresponding target electric control unit is adjusted so that the frequencies of the any two target electric control units are different, thereby avoiding the frequency coupling superposition between different controllable switches, so that the EMC of the electric control system meets the requirements.

[0075] Corresponding to the above embodiment, the present invention also proposes a computer-readable storage medium.

[0076] The computer-readable storage medium of the embodiment of the present invention stores a control program of an electric control system, and the control program of the electric control system implements the above-mentioned control method of the electric control system when executed by a processor.

[0077] According to the computer-readable storage medium of an embodiment of the present invention, the control method of the electric control system is implemented when the control program of the electric control system is executed by the processor. Based on the control method of the electric control system, in the process of driving the controllable switch, when at least one frequency among the multiple frequencies corresponding to any two target electric control units is the same, the switching frequencies corresponding to the corresponding target electric control units are adjusted so that the frequencies of the any two target electric control units are different, thereby avoiding the frequency coupling and superposition between different controllable switches and improving the EMC of the electric control system.

[0078] Corresponding to the above embodiment, the present invention also proposes an electric control system.

[0079] like Figure 7 As shown, the electronic control system of the embodiment of the present invention includes: a plurality of electronic control units 10 , an acquisition unit 20 and a control unit 30 .

[0080] Each electronic control unit 10 includes a controllable switch. The acquisition unit 20 is used to acquire multiple frequencies corresponding to each target electronic control unit in the current control cycle, wherein the electronic control unit 10 includes a target electronic control unit, and the multiple frequencies include a switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency. The control unit 30 is used to adjust the switching frequency corresponding to at least one target electronic control unit in any two target electronic control units when at least one frequency is the same among the multiple frequencies corresponding to any two target electronic control units, so that the multiple frequencies corresponding to any two target electronic control units are different.

[0081] According to an embodiment of the present invention, each electronic control unit 10 has a corresponding switching frequency range, and the switching frequency corresponding to each target electronic control unit is obtained from the corresponding switching frequency range.

[0082] According to an embodiment of the present invention, the multiple target ECUs are ECUs whose frequency spectra overlap among the multiple ECUs, wherein the frequency spectrum is determined according to a switching frequency range and a harmonic frequency range corresponding to the switching frequency range.

[0083] According to one embodiment of the present invention, the control unit 30 adjusts the switching frequency corresponding to at least one of any two target electronic control units, specifically for: adjusting the switching frequency corresponding to at least one of any two target electronic control units to the switching frequency corresponding to the previous control cycle.

[0084] According to one embodiment of the present invention, multiple target electronic control units include a power factor correction unit, a compressor drive unit and a fan drive unit, wherein the output end of the power factor correction unit is connected to the input end of the compressor drive unit and the input end of the fan drive unit, respectively, and the acquisition unit 20 is also used to obtain the input voltage, output voltage and first working current of the power factor correction unit, the second working current of the compressor drive unit and the third working current of the fan drive unit; based on the input voltage, output voltage, first working current, second working current and third working current, the corresponding switching frequency is obtained from the corresponding switching frequency range of each target electronic control unit.

[0085] According to one embodiment of the present invention, when the frequency spectrum corresponding to the fan drive unit overlaps with the frequency spectrum corresponding to the compressor drive unit and the frequency spectrum corresponding to the power factor correction unit, and the frequency spectrum corresponding to the compressor drive unit does not overlap with the frequency spectrum corresponding to the power factor correction unit, the priority of adjusting the switching frequency corresponding to the fan drive unit is higher than the priority of adjusting the switching frequencies corresponding to the compressor drive unit and the power factor correction unit.

[0086] It should be noted that for details not disclosed in the electric control system of the embodiment of the present invention, please refer to the details disclosed in the control method of the electric control system of the above embodiment of the present invention, and the details will not be repeated here.

[0087] According to the electric control system of the embodiment of the present invention, each electric control unit includes a controllable switch, and a plurality of frequencies corresponding to each target electric control unit in a plurality of target electric control units in the current control cycle are obtained by an acquisition unit, wherein the electric control unit includes a target electric control unit, and the plurality of frequencies include a switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency. When at least one frequency is the same among the plurality of frequencies corresponding to any two target electric control units, the control unit adjusts the switching frequency corresponding to at least one target electric control unit in any two target electric control units, so that the plurality of frequencies corresponding to any two target electric control units are different. Thus, in the process of driving the controllable switch, when at least one frequency is the same among the plurality of frequencies corresponding to any two target electric control units, the electric control system adjusts the switching frequency corresponding to the corresponding target electric control unit, so that the frequencies of the any two target electric control units are different, thereby avoiding the frequency coupling superposition between different controllable switches, and making the EMC of the electric control system meet the requirements.

[0088] Corresponding to the above embodiment, the present invention also proposes an electrical device.

[0089] like Figure 8 As shown, the electrical device 100 of the embodiment of the present invention includes the above-mentioned electric control system 110. The electrical device 100 may be an air conditioner, a refrigerator, a washing machine, etc., which is not limited here.

[0090] According to the electrical equipment of an embodiment of the present invention, based on the above-mentioned electrical control system, in the process of driving the controllable switch, when at least one frequency among the multiple frequencies corresponding to any two target electrical control units is the same, the switching frequencies corresponding to the corresponding target electrical control units are adjusted so that the frequencies of the any two target electrical control units are different, thereby avoiding the frequency coupling and superposition between different controllable switches, making the EMC of the electrical control system meet the requirements, and ensuring the working stability of the electrical equipment.

[0091] Corresponding to the above embodiment, the present invention also proposes an air conditioner.

[0092] like Fig. 9 As shown, the air conditioner 200 of the embodiment of the present invention includes a memory 210, a processor 220, and a control program of the electric control system stored in the memory 210 and executable on the processor 220. When the processor 220 executes the control program of the electric control system, the control method of the electric control system is implemented.

[0093] According to the air conditioner of the embodiment of the present invention, the control program of the electric control system runs on the processor, and when the processor executes the control program of the electric control system, the control method of the electric control system is implemented. Based on the control method of the electric control system, in the process of driving the controllable switch, when at least one frequency among the multiple frequencies corresponding to any two target electric control units is the same, the switching frequencies corresponding to the corresponding target electric control units are adjusted so that the frequencies of the any two target electric control units are different, thereby avoiding the frequency coupling and superposition between different controllable switches, so that the EMC of the electric control system meets the requirements, and the working stability of the air conditioner is further guaranteed.

[0094] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0095] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0097] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A control method for an electric control system, characterized in that: The system includes a plurality of electronic control units, each of which includes a controllable switch, and the method includes: Acquire multiple frequencies corresponding to each of the target electronic control units in a current control cycle, wherein the electronic control unit includes the target electronic control unit, and the multiple frequencies include a switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency; When at least one frequency among the multiple frequencies corresponding to any two of the target electronic control units is the same, the switching frequency corresponding to at least one of the any two target electronic control units is adjusted so that the multiple frequencies corresponding to any two of the target electronic control units are different.

2. The method according to claim 1, characterized in that Each of the electronic control units has a corresponding switching frequency range, and the switching frequency corresponding to each of the target electronic control units is obtained from the corresponding switching frequency range.

3. The method according to claim 2, characterized in that The multiple target electronic control units are electronic control units whose frequency spectra overlap among the multiple electronic control units, wherein the frequency spectrum is determined according to the switching frequency range and the harmonic frequency range corresponding to the switching frequency range.

4. The method according to any one of claims 1 to 3, characterized in that: The adjusting the switching frequency corresponding to at least one of any two target electronic control units includes: The switching frequency corresponding to at least one of any two target electronic control units is adjusted to the switching frequency corresponding to the previous control cycle.

5. The method according to claim 3, characterized in that: The plurality of target electronic control units include a power factor correction unit, a compressor drive unit and a fan drive unit, wherein an output end of the power factor correction unit is connected to an input end of the compressor drive unit and an input end of the fan drive unit, respectively, and the method further includes: Acquire an input voltage, an output voltage and a first operating current of the power factor correction unit, a second operating current of the compressor drive unit and a third operating current of the fan drive unit; Based on the input voltage, the output voltage, the first operating current, the second operating current and the third operating current, a corresponding switching frequency is acquired from a corresponding switching frequency range of each target electronic control unit.

6. The method according to claim 5, characterized in that When the frequency spectrum corresponding to the fan drive unit overlaps with the frequency spectrum corresponding to the compressor drive unit and the frequency spectrum corresponding to the power factor correction unit, and the frequency spectrum corresponding to the compressor drive unit does not overlap with the frequency spectrum corresponding to the power factor correction unit, the priority of adjusting the switching frequency corresponding to the fan drive unit is higher than the priority of adjusting the switching frequencies corresponding to the compressor drive unit and the power factor correction unit.

7. A computer-readable storage medium, characterized in that: A control program of an electric control system is stored thereon, and when the control program of the electric control system is executed by a processor, a control method of an electric control system according to any one of claims 1-6 is implemented.

8. An electronic control system, characterized in that: include: A plurality of electronic control units, each of which comprises a controllable switch; an acquisition unit, configured to acquire a plurality of frequencies corresponding to each of a plurality of target electronic control units in a current control cycle, wherein the electronic control units include the target electronic control units, and the plurality of frequencies include a switching frequency of the controllable switch and multiple harmonic frequencies corresponding to the switching frequency; A control unit is used to adjust the switching frequency corresponding to at least one of any two target electronic control units when at least one frequency among the multiple frequencies corresponding to any two of the target electronic control units is the same, so that the multiple frequencies corresponding to any two of the target electronic control units are different.

9. An electrical device, characterized in that: Comprising the electronic control system according to claim 8.

10. An air conditioner, characterized in that: The invention comprises a memory, a processor and a control program of an electric control system stored in the memory and executable on the processor. When the processor executes the control program of the electric control system, a control method of the electric control system according to any one of claims 1 to 6 is implemented.

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