A boost circuit-based electrolytic capacitor-free control LC oscillation suppression method

Abstract

The application discloses a method for controlling LC oscillation based on a boost circuit and without an electrolytic capacitor. The method comprises the following steps: collecting the mains voltage of a compressor, and calculating the amplitude voltage of the mains according to the mains voltage and a preset filter time factor; calculating the phase of the power grid based on the amplitude voltage and the mains voltage to obtain the phase of the power grid; extracting the input current of the compressor, and calculating the amplitude of the harmonic component in the input current according to Fourier decomposition and the input current to obtain the amplitude of the harmonic component in the input current; obtaining the compensation gain of the MOS tube opening at the next moment according to the amplitude of the harmonic component, and calculating the compensation time of the MOS tube opening at the next moment based on the phase of the power grid and the compensation gain to obtain the compensation time of the MOS tube opening at the next moment. According to the compensation time, the opening time of the MOS tube is adjusted, the amplitude of the harmonic component in the input current tends to be zero, the purpose of LC harmonic elimination is achieved, and the work of parameter adjustment is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of controller, in particular to a LC oscillation suppression method based on a boost circuit and without electrolytic capacitor. BACKGROUND

[0002] In the field of controlling without electrolytic capacitor, the rated voltage of refrigerator compressor, air conditioner compressor and the like is 220V. However, in some areas such as North America and Japan, the mains voltage is 110V. Therefore, in practical application, the 110V voltage needs to be boosted to 220V to meet the demand of household appliances such as refrigerator and air conditioner. However, due to the fact that the bus film capacitor has a very small capacitance value (3.5uF), there exists LC oscillation phenomenon in the process of boosting conversion through the MOS tube and the boost inductor, that is, the LC resonance occurs between the boost inductor L and the bus film capacitor C, and high-frequency harmonic will be generated on the bus voltage, wherein the frequency of the harmonic is At the same time, high-frequency harmonic also exists in the input current, which on the one hand will produce unnecessary noise, and on the other hand will bring EMI, EMC problems such as radiation and conduction, which will endanger the power grid and need to generate additional rectification costs. Therefore, the LC resonance suppression in the boost control is one of the problems to be solved in the control without electrolytic capacitor. SUMMARY

[0003] The embodiment of the present application provides a LC oscillation suppression method based on a boost circuit and without electrolytic capacitor, and aims at solving the problem of LC resonance in the process of voltage boosting in the traditional control technology without electrolytic capacitor.

[0004] In a first aspect, the embodiment of the present application provides a LC oscillation suppression method based on a boost circuit and without electrolytic capacitor, which comprises the following steps.

[0005] The mains voltage of the compressor is collected, and the amplitude voltage of the mains is calculated according to the mains voltage and a preset filter time factor;

[0006] The phase of the power grid is calculated based on the amplitude voltage and the mains voltage, and the phase of the power grid is obtained;

[0007] The input current of the compressor is extracted, and the harmonic component amplitude in the input current is calculated according to the Fourier decomposition and the input current, and the harmonic component amplitude of the input current is obtained;

[0008] The compensation gain of the MOS tube opening at the next moment is obtained according to the harmonic component amplitude, and the compensation time of the MOS tube opening at the next moment is calculated based on the phase of the power grid and the compensation gain, and the compensation time of the MOS tube opening at the next moment is obtained.

[0009] In a second aspect, the embodiment of the present application provides a LC oscillation suppression system based on a boost circuit and without electrolytic capacitor, which comprises the following steps.

[0010] a voltage calculation module configured to collect mains voltage of the compressor and calculate a magnitude voltage of the mains according to the mains voltage and a preset filter time factor;

[0011] a phase calculation module configured to calculate a phase of the power grid based on the magnitude voltage and the mains voltage, and obtain a power grid phase;

[0012] a magnitude calculation module configured to extract input current of the compressor, calculate a harmonic component magnitude in the input current according to Fourier decomposition and the input current, and obtain a harmonic component magnitude of the input current;

[0013] a time calculation module configured to obtain a compensation gain of the MOS tube turn-on at the next time according to the harmonic component magnitude, and calculate a compensation time of the MOS tube turn-on at the next time based on the power grid phase and the compensation gain, and obtain a compensation time of the MOS tube turn-on at the next time.

[0014] In a third aspect, an embodiment of the present application further provides a compressor device, comprising a control loop and a compressor, and the control loop is provided with the electrolytic capacitor-free control LC oscillation suppression system based on the boost circuit according to the second aspect.

[0015] The control loop compensates for the turn-on time of the MOS tube in the control circuit according to the compensation time.

[0016] In a fourth aspect, an embodiment of the present application further provides a computer device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the electrolytic capacitor-free control LC oscillation suppression method based on the boost circuit according to the first aspect when executing the computer program.

[0017] In a fifth aspect, an embodiment of the present application further provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program makes the processor execute the electrolytic capacitor-free control LC oscillation suppression method based on the boost circuit according to the first aspect when being executed by the processor.

[0018] The embodiment of the present application provides a boost circuit-based electrolytic capacitor-free control LC oscillation suppression method. The method comprises the following steps: collecting mains voltage of a compressor, and calculating an amplitude voltage of the mains according to the mains voltage and a preset filtering time factor; calculating a power grid phase based on the amplitude voltage and the mains voltage to obtain the power grid phase; extracting an input current of the compressor, and calculating a harmonic component amplitude in the input current according to Fourier decomposition and the input current to obtain the harmonic component amplitude of the input current; obtaining a compensation gain of MOS tube opening at a next moment according to the harmonic component amplitude, and calculating a compensation time of MOS tube opening at the next moment based on the power grid phase and the compensation gain to obtain the compensation time of MOS tube opening at the next moment. The method collects the input current of the compressor, performs Fourier decomposition on the input current, extracts the harmonic component amplitude of the input current, calculates the compensation time of MOS tube opening at the next moment according to the compensation gain of MOS tube opening and the power grid phase, and adjusts the opening time of the MOS tube according to the compensation time, so that the harmonic component amplitude in the input current tends to be zero, and the purpose of LC harmonic elimination is achieved, and the work of parameter setting is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a flowchart of the embodiment of the boost circuit-based electrolytic capacitor-free control LC oscillation suppression method of the present application;

[0021] Figure 2 is a schematic block diagram of the boost circuit-based electrolytic capacitor-free control LC oscillation suppression system of the present application;

[0022] Figure 3 is a control circuit schematic diagram of the boost circuit-based electrolytic capacitor-free control LC oscillation suppression method of the present application;

[0023] Figure 4 is an input current waveform diagram without using the boost circuit-based electrolytic capacitor-free control LC oscillation suppression method of the present application;

[0024] Figure 5 is an input current waveform diagram using the boost circuit-based electrolytic capacitor-free control LC oscillation suppression method of the present application. DETAILED DESCRIPTION

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present application.

[0026] It should be understood that the terms "comprise" and "include" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0027] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0029] Reference Figure 1 , Figure 1 The flowchart shows an embodiment of the present application based on the boost circuit control LC oscillation suppression method without electrolytic capacitor. In this embodiment, the method comprises steps S110-S140:

[0030] Step S110, collect the mains voltage of the compressor, and calculate the amplitude voltage of the mains according to the mains voltage and the preset filter time factor;

[0031] In this embodiment, in the control system without electrolysis, in order to fully utilize the physical quantity in vector control, the mains voltage of the compressor bus is detected in real time when the compressor is running, and the amplitude voltage of the mains is calculated based on the mains voltage and the preset filter time factor. Wherein, the input effective voltage U(n) is calculated according to the following formula: flt

[0032] U flt (n) 2 =(U ad (n)*U ad (n)-U flt (n-1) 2 )*τ1+U flt (n-1) 2 ,​

[0033] wherein, U ad (n) represents the mains voltage collected at time n, U flt (n) represents the effective voltage of the mains voltage collected at time n, U flt (n-1) represents the effective voltage of the mains voltage collected at time n-1, and τ1 represents the first filtering time factor;

[0034] Then, the amplitude voltage U rms (n) is calculated according to the following formula:

[0035]

[0036] In step S120, the phase of the power grid is calculated based on the amplitude voltage and the mains voltage, to obtain the phase of the power grid.

[0037] In this embodiment, in order to detect the phase of the power grid, the phase of the power grid is calculated based on the effective voltage and the mains voltage, to obtain the phase of the power grid sinθ. The phase of the power grid sinθ is calculated according to the following formula:

[0038]

[0039] In step S130, the input current of the compressor is extracted, and the amplitude of the harmonic component in the input current is calculated according to the Fourier decomposition and the input current, to obtain the amplitude of the harmonic component of the input current.

[0040] In this embodiment, the input current of the compressor is extracted, and the sine function and the cosine function of the harmonic component in the input current are calculated according to the Fourier decomposition and the input current, to obtain the Fourier-decomposed sine function A FFT (n) and the Fourier-decomposed cosine function B FFT (n). Then, the sin component and the cos component in the harmonic component of the input current I(n) are calculated based on the Fourier-decomposed sine function A FFT (n) and the Fourier-decomposed cosine function B FFT (n). Finally, the amplitude of the harmonic component of the input current I h (n) is obtained based on the sin component and the cos component in the harmonic component. The Fourier-decomposed sine function A FFT (n) and the Fourier-decomposed cosine function B FFT (n) are calculated according to the following formula:

[0041]

[0042] A FFT (n) = sin(θ FFT (n))

[0043] BFFT (n) = cos(θ FFT (n))

[0044] Wherein, % represents the remainder operation, f s represents the control frequency, A FFT (n) and B FFT (n) are the Fourier decomposition of the sine function and cosine function, respectively, L represents the inductance of the boost inductor, C represents the capacitance of the film capacitor, represents the frequency of the harmonic component;

[0045] Then calculate the sin component and the cos component in the harmonic component in the input current I(n) according to the following formula:

[0046] I sin (n) = (I(n)*A FFT (n)-I sin (n-1))*τ2+I sin (n-1),

[0047] I cos (n) = (I(n)*B FFT (n)-I cos (n-1))*τ2+I cos (n-1),

[0048] Wherein, I sin (n-1) represents the sin component of the harmonic component in the input current at time n-1, I sin (n) represents the sin component of the harmonic component in the input current at time n, I cos (n-1) represents the cos component of the harmonic component in the input current at time n-1, I cos (n) represents the cos component of the harmonic component in the input current at time n, and τ2 represents the second filtering time factor. Since τ2 and τ1 process signals of different frequencies, they are distinguished;

[0049] Then calculate the harmonic component amplitude I h (n) according to the following formula:

[0050]

[0051] Step S140, according to the harmonic component amplitude, obtain the compensation gain of the MOS tube opening at the next time, and calculate the compensation time of the MOS tube opening at the next time based on the power grid phase and the compensation gain, to obtain the compensation time of the MOS tube opening at the next time.

[0052] In this embodiment, the compensation gain of the MOS tube opening at the next time is determined according to the harmonic component amplitude first, and the determination process of the compensation gain includes:

[0053] Step one, initialize the target duration of the timing, the excitation signal is placed in the flag = 0, set the compensation gain for K com (n), the first adjustment step size is ΔK1 = K max / 100, the second adjustment step size is ΔK2 = K max / 50, wherein, K max is the preset maximum compensation gain;

[0054] Step two, calculate the harmonic component amplitude I h (n+1) at the time of n+1, if the timing reaches the target duration, if the excitation signal flag = 1, return to step three, if the excitation signal flag = 0, jump to step four, if the timing does not reach the target duration, update n = n + 1 and return to step two;

[0055] Step three, if the harmonic component amplitude at the time of n+1 is greater than the harmonic component amplitude at the time of n I h (n+1) > I h (n), the compensation gain at the time of n+1 is K com (n+1) = K com (n) + ΔK1 + ΔK2, if the harmonic component amplitude at the time of n+1 is less than the harmonic component amplitude at the time of n I h (n+1) < I h (n), the compensation gain at the time of n+1 is K com (n+1) = K com (n) - ΔK1 + ΔK2, flag = 0, jump to step five;

[0056] Step four, if the harmonic component amplitude at the time of n+1 is greater than the harmonic component amplitude at the time of n I h (n+1) > I h (n), the compensation gain at the time of n+1 is K com (n+1) = K com (n) - ΔK1 - ΔK2, if the harmonic component amplitude at the time of n+1 is less than the harmonic component amplitude at the time of n I h (n+1) < I h (n), the compensation gain at the time of n+1 is K com (n+1) = K com (n) + ΔK1 - ΔK2, flag = 1, jump to step five;

[0057] Step five, the target duration is cleared, and returns to step two.

[0058] Further, when the compensation gain of the next time the MOS tube is turned on is determined, the compensation time of the next time the MOS tube is turned on is calculated based on the grid phase and the compensation gain, and the compensation time of the next time the MOS tube is turned on is obtained. Wherein, the compensation time of the next time the MOS tube is turned on is calculated according to the following formula com (n+1):

[0059] T com (n+1)=K com (n+1)*sinθ。

[0060] In the method, the input current of the compressor is collected, the input current is Fourier decomposed, the harmonic component amplitude of the input current is extracted, the MOS tube opening compensation time of the next time is calculated according to the compensation gain of the MOS tube opening and the grid phase, and the MOS tube opening time is adjusted according to the compensation time, so that the harmonic component amplitude in the input current tends to zero, so as to achieve the purpose of LC harmonic elimination, and the parameter setting work is greatly reduced.

[0061] The embodiment of the application also provides a boost circuit-based electrolytic capacitor-free control LC oscillation suppression system, which is used to execute any one of the foregoing boost circuit-based electrolytic capacitor-free control LC oscillation suppression methods. Specifically, refer to Figure 2 , Figure 2 is a schematic block diagram of the boost circuit-based electrolytic capacitor-free control LC oscillation suppression system provided by the embodiment of the application. The boost circuit-based electrolytic capacitor-free control LC oscillation suppression system 100 can be configured in a server.

[0062] As shown in Figure 2 , the boost circuit-based electrolytic capacitor-free control LC oscillation suppression system 100 includes a voltage calculation module 110, a phase calculation module 120, an amplitude calculation module 130, and a time calculation module 140.

[0063] The voltage calculation module 110 is configured to collect the mains voltage of the compressor and calculate the amplitude voltage of the mains according to the mains voltage and a preset filter time factor.

[0064] The phase calculation module 120 is configured to calculate the phase of the grid based on the amplitude voltage and the mains voltage, and obtain the grid phase.

[0065] The amplitude calculation module 130 is configured to extract the input current of the compressor, calculate the harmonic component amplitude in the input current according to Fourier decomposition and the input current, and obtain the harmonic component amplitude of the input current.

[0066] The time calculation module 140 is used for obtaining the compensation gain of the MOS tube opening at the next time according to the harmonic component amplitude, and calculating the compensation time of the MOS tube opening at the next time based on the power grid phase and the compensation gain, so as to obtain the compensation time of the MOS tube opening at the next time

[0067] The embodiment of the present application also provides a compressor device, comprising a control circuit and a compressor, wherein the control circuit is provided with the electrolytic capacitor-free control LC oscillation suppression system based on the boost circuit.

[0068] The control circuit compensates the opening time of the MOS tube in the control circuit according to the compensation time.

[0069] In the embodiment, the compressor device is composed of a control circuit and a compressor, and the control circuit can be a single-chip microcomputer or the like, and the control circuit is provided with the electrolytic capacitor-free control LC oscillation suppression system based on the boost circuit.

[0070] Further, as shown in Figure 3 The control circuit used in the present application is shown in the drawings, wherein S1-S7 represent MOS tubes, C1 represents a thin film capacitor, D1 represents a diode, DB1 represents a rectifier bridge, L1 represents an inductor, and CN1 and CN2 represent terminal connections. The opening time of S7 is controlled to realize the control of the bus capacitor C1 voltage, and the longer the opening time of S7 is, the higher the bus voltage is. However, L1 and C1 will resonate to generate high-frequency harmonics on the bus voltage, and the amplitude and phase of the high-frequency harmonics are detected to appropriately compensate the opening time of S7, so as to achieve the goal of eliminating the high-frequency harmonics of the bus voltage.

[0071] Referring to Figure 4 and Figure 5 As shown in Figure 4 is an input current waveform diagram without using the electrolytic capacitor-free control LC oscillation suppression method based on the boost circuit of the present application, Figure 5 is an input current waveform diagram using the electrolytic capacitor-free control LC oscillation suppression method based on the boost circuit of the present application. After comparison, the input current waveform using the electrolytic capacitor-free control LC oscillation suppression method based on the boost circuit of the present application is obviously improved.

[0072] The embodiment of the present application further provides a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the boost-circuit-based electrolytic capacitor-free control LC oscillation suppression method as described above when executing the computer program.

[0073] In another embodiment of the present application, a computer readable storage medium is provided. The computer readable storage medium can be a non-volatile computer readable storage medium. The computer readable storage medium stores a computer program which, when executed by a processor, causes the processor to execute the boost-circuit-based electrolytic capacitor-free control LC oscillation suppression method as described above.

[0074] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the devices, apparatuses and units described above can refer to the corresponding processes in the foregoing method embodiments, which will not be described here. Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in general terms in the foregoing description. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0075] In several embodiments provided by the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other manners. For example, the described apparatus embodiments are merely schematic. The division of the units is merely a logical function division. There can be another division manner in actual implementation, or a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or other forms of connections.

[0076] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present application.

[0077] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0078] When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art, or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a magnetic disk or an optical disk, and various program code storage media.

[0079] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for suppressing LC oscillation based on a boost circuit without an electrolytic capacitor, characterized by, The method comprises the following steps: acquiring the mains voltage of the compressor, and calculating the amplitude voltage of the mains according to the mains voltage and a preset filter time factor; calculating the phase of the power grid based on the amplitude voltage and the mains voltage to obtain the phase of the power grid; extracting the input current of the compressor, and calculating the harmonic component amplitude of the input current according to Fourier decomposition and the input current to obtain the harmonic component amplitude of the input current; acquiring the compensation gain of the MOS tube opening of the compressor at the next moment according to the harmonic component amplitude, and calculating the compensation time of the MOS tube opening of the compressor at the next moment based on the phase of the power grid and the compensation gain to obtain the compensation time of the MOS tube opening of the compressor at the next moment; the compensation gain of the MOS tube opening at the next moment is acquired according to the harmonic component amplitude, and the compensation time of the MOS tube opening at the next moment is calculated based on the phase of the power grid and the compensation gain, and the compensation time of the MOS tube opening of the compressor at the next moment is obtained, comprising: Step one, initialize the target duration of the timing, incentive signal is placed in the flag flag = 0, set the compensation gain for K com (n), the first adjustment step is ΔK1 = K max / 100, the second adjustment step is ΔK2 = K max / 50, wherein, K max is the preset maximum compensation gain; Step two, calculate the harmonic component amplitude I at n+1 time h (n+1), when the timing reaches the target length, if the excitation signal flag=1, return to step three, if the excitation signal flag=0, jump to step four, if the timing does not reach the target length, update n=n+1 and return to step two; Step three, if the harmonic component amplitude at n+1 time is greater than the harmonic component amplitude I at n time h (n+1) > I h (n), the compensation gain at n+1 time is K com (n+1) = K com (n) + ΔK1+ ΔK2, if the harmonic component amplitude at n+1 time is less than the harmonic component amplitude I at n time h (n+1) < I h (n), the compensation gain at n+1 time is K com (n+1) = K com (n) - ΔK1+ ΔK2, flag = 0, jump to step five; Step four, if the harmonic component amplitude at n+1 time is greater than the harmonic component amplitude I at n time h (n+1) > I h (n), the compensation gain at n+1 time is K com (n+1) = K com (n)-ΔK1-ΔK2, if the harmonic component amplitude at n+1 time is less than the harmonic component amplitude I at n time h (n+1) < I h (n), the compensation gain at n+1 time is K com (n+1) = K com (n)+ΔK1-ΔK2, flag = 1, jump to step five; step five, the target duration is cleared, and step two is returned.

2. The boost circuit-based control LC oscillation suppression method of claim 1, wherein the amplitude voltage of the mains is calculated according to the mains voltage and a preset filter time factor, comprising: The effective voltage U of the mains voltage is calculated according to the following formula flt (n): U 2 flt (n) = (U ad (n)*U ad (n)-U 2 flt (n-1))*τ1+U 2 flt (n-1), wherein U ad (n) represents the mains voltage collected at time n, U flt (n) represents the effective voltage of the mains voltage collected at time n, U flt (n-1) represents the effective voltage of the mains voltage collected at time n-1, τ1 represents a first filter time factor; the amplitude voltage is calculated according to the following formula: wherein U rms (n) represents the amplitude voltage.

3. The boost circuit-based control LC oscillation suppression method of claim 2, wherein the phase of the power grid is calculated based on the amplitude voltage and the mains voltage to obtain the phase of the power grid, comprising: the phase of the power grid is calculated according to the following formula: wherein θ represents the phase of the power grid.

4. The boost circuit-based control LC oscillation suppression method according to claim 3, wherein the input current of the compressor is extracted, and the harmonic component amplitude of the input current is calculated according to Fourier decomposition and the input current to obtain the harmonic component amplitude of the input current, comprising: The Fourier-decomposed sine function A FFT (n) and the cosine function B FFT (n) are calculated as follows A FFT (n) = sin(θ FFT (n)) B FFT (n) = cos(θ FFT (n)) Where % represents the remainder operation, f s Indicates the control frequency, A FFT (n) and B FFT (n) represent the sine and cosine functions obtained from Fourier decomposition, respectively; L represents the inductance of the boost inductor; and C represents the capacitance of the film capacitor. Indicates the frequency of harmonic components; the sin component and the cos component in the harmonic component in the input current I(n) are calculated according to the following formula: I sin (n) = (I(n) * A FFT (n) - I sin (n-1) * τ2+ I sin (n-1), I cos (n) = (I(n) * B FFT (n) - I cos (n-1) * τ2+ I cos (n-1), where I sin (n-1) represents the sin component of the harmonic content of the input current at time n-1, I sin (n) represents the sin component of the harmonic content of the input current at time n, I cos (n-1) represents the cos component of the harmonic content of the input current at time n-1, I cos (n) represents the cos component of the harmonic content of the input current at time n, τ2 represents the second filter time factor; The amplitude I of the harmonic component at time n is calculated according to the following equation h (n):

5. The boost circuit-based control LC oscillation suppression method of claim 3, wherein, the compensation time of the MOS tube opening of the compressor at the next moment is calculated based on the phase of the power grid and the compensation gain to obtain the compensation time of the MOS tube opening of the compressor at the next moment, comprising: The compensation time T of the MOS transistor opening at the next time is calculated according to the following formula com (n+1): T com (n+1) = K com (n+1)*sinθ.

6. A boost circuit based electrolytic capacitor-less control LC oscillation suppression system, characterized in that, comprising: a voltage calculation module, configured to acquire the mains voltage of the compressor, and calculate the amplitude voltage of the mains according to the mains voltage and a preset filter time factor; a phase calculation module, configured to calculate the phase of the power grid based on the amplitude voltage and the mains voltage to obtain the phase of the power grid; an amplitude calculation module, configured to extract the input current of the compressor, and calculate the harmonic component amplitude of the input current according to Fourier decomposition and the input current to obtain the harmonic component amplitude of the input current; a time calculation module, configured to acquire the compensation gain of the MOS tube opening of the compressor at the next moment according to the harmonic component amplitude, and calculate the compensation time of the MOS tube opening of the compressor at the next moment based on the phase of the power grid and the compensation gain to obtain the compensation time of the MOS tube opening of the compressor at the next moment; the time calculation module is specifically configured to: Step one, initialize the target duration of the timing, incentive signal is placed in the flag flag = 0, set the compensation gain for K com (n), the first adjustment step is ΔK1 = K max / 100, the second adjustment step is ΔK2 = K max / 50, wherein, K max is the preset maximum compensation gain; Step two, calculate the harmonic component amplitude I at n+1 time h (n+1), when the timing reaches the target length, if the excitation signal flag=1, return to step three, if the excitation signal flag=0, jump to step four, if the timing does not reach the target length, update n=n+1 and return to step two; Step three, if the harmonic component amplitude at n+1 time is greater than the harmonic component amplitude at n time I h (n+1) > I h (n), the compensation gain at n+1 time is K com (n+1) = K com (n) + ΔK1+ ΔK2, if the harmonic component amplitude at n+1 time is less than the harmonic component amplitude at n time I h (n+1) < I h (n), the compensation gain at n+1 time is K com (n+1) = K com (n) - ΔK1+ ΔK2, flag = 0, jump to step five; Step four, if the harmonic component amplitude at n+1 time is greater than the harmonic component amplitude at n time I h (n+1) > I h (n), the compensation gain at n+1 time is K com (n+1) = K com (n) - ΔK1- ΔK2, if the harmonic component amplitude at n+1 time is less than the harmonic component amplitude at n time I h (n+1) < I h (n), the compensation gain at n+1 time is K com (n+1) = K com (n) + ΔK1- ΔK2, flag = 1, jump to step five; step five, the target duration is cleared, and step two is returned.

7. A boost circuit-based electrolytic capacitorless control LC oscillation suppression device, characterized by, comprising a control loop and a compressor, and the control loop is provided with the electrolytic capacitor free control LC oscillation suppression system based on the boost circuit as claimed in claim 6; the control loop compensates the opening time of the MOS tube in the control circuit according to the compensation time.

8. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, the processor executes the computer program to realize the electrolytic capacitor free control LC oscillation suppression method based on the boost circuit as claimed in any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, which, when executed by the processor, causes the processor to perform the boost circuit-based control LC oscillation suppression method without an electrolytic capacitor according to any one of claims 1 to 5.

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