Control method for prolonging service life of electrolytic capacitor and related equipment

Abstract

The invention relates to a control method for prolonging the service life of an electrolytic capacitor and related equipment. Wherein the electrolytic capacitor is connected with the power supply processing module and the load module and is used for filtering the output of the power supply processing module and inputting the filtered output to the load module, and the method comprises the following steps: establishing a corresponding relation between the input voltage of the power supply processing module and the input limiting power of the load module; real-time input voltage corresponding to the power supply processing module is obtained, and input limiting power of the load module is obtained according to the real-time input voltage of the power supply processing module and the corresponding relation; and adjusting the working state of the load module according to the input limiting power of the load module so that the output power of the power processing module is not greater than the input limiting power of the load module. By implementing the invention, the service life of the electrolytic capacitor can be prolonged on the basis of not increasing the circuit cost, so that the service life of a product is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and more specifically, to a method for controlling the life extension of an electrolytic capacitor and related equipment. Background Art

[0002] At present, most inverter refrigerator control boards are equipped with large-capacitance electrolytic capacitors. In specific circuits, electrolytic capacitors are usually used to filter the rectified mains voltage to provide input power for the back-end inverter bridge. When the circuit is powered on, a peak current will flow through the electrolytic capacitor during the charging and discharging process. This peak current generates power loss under the impedance of the electrolytic capacitor itself, causing the electrolytic capacitor to heat up. Therefore, excessive current or excessive temperature rise will shorten the service life of the electrolytic capacitor. In actual circuits, the life of the electrolytic capacitor directly determines the life of the control board. The use of long-life capacitors and large-capacitance electrolytic capacitors not only increases product costs, but may also require changes to the circuit design of the entire product, increasing circuit costs. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for controlling the life extension of an electrolytic capacitor and related equipment in view of the above-mentioned defects of some of the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a method for controlling the life extension of an electrolytic capacitor, wherein the electrolytic capacitor is connected to a power processing module and a load module, and is used to filter the output of the power processing module and input it to the load module, and the method comprises:

[0005] Establishing a corresponding relationship between the input voltage of the power processing module and the input limiting power of the load module;

[0006] Acquire the real-time input voltage corresponding to the power processing module, so as to acquire the input limit power of the load module according to the real-time input voltage of the power processing module and the corresponding relationship;

[0007] The working state of the load module is adjusted according to the input limit power of the load module so that the output power of the power processing module is not greater than the input limit power of the load module.

[0008] Preferably, in an embodiment of the electrolytic capacitor life extension control method of the present invention, the step of obtaining the real-time input voltage corresponding to the power processing module includes:

[0009] A bus voltage corresponding to the power processing module is obtained, so as to obtain a real-time input voltage corresponding to the power processing module according to the bus voltage.

[0010] Preferably, in an embodiment of the electrolytic capacitor life extension control method of the present invention, the step of obtaining the real-time input voltage corresponding to the power processing module according to the bus voltage includes:

[0011] The peak value of the bus voltage is obtained, and the real-time input voltage is obtained according to the formula VAC=k1*Vdc_peak / 1.414, wherein VAC is the real-time input voltage, Vdc_peak is the peak voltage of the bus voltage, and k1 is the first preset fitting coefficient.

[0012] Preferably, in an embodiment of the electrolytic capacitor life extension control method of the present invention, the first preset fitting coefficient is 0.9 to 1.1.

[0013] Preferably, in one embodiment of the electrolytic capacitor life extension control method of the present invention, the load module includes a compressor;

[0014] The step of adjusting the working state of the load module according to the input limiting power of the load module so that the output power of the power processing module is not greater than the input limiting power of the load module includes:

[0015] Obtain the estimated power of the compressor. When the estimated power of the compressor is greater than the input limit power of the compressor, adjust the speed of the compressor according to the difference between the estimated power of the compressor and the input limit power of the compressor, so that the output power of the power processing module is the input limit power of the compressor.

[0016] Preferably, in one embodiment of the electrolytic capacitor life extension control method described in the present invention, obtaining the estimated power of the compressor includes: obtaining the estimated power of the compressor according to Pinv=K2*3 / 2(VD*ID+VQ*IQ), wherein Pinv is the estimated power of the compressor, VD is the direct-axis voltage of the compressor, ID is the direct-axis current of the compressor, VQ is the quadrature-axis voltage of the compressor, IQ is the quadrature-axis current of the compressor, and K2 is the second preset fitting coefficient.

[0017] Preferably, in an embodiment of the electrolytic capacitor life extension control method of the present invention, the second preset fitting coefficient is 0.8 to 1.2.

[0018] The present invention also constructs an electronic device for implementing the above-mentioned electrolytic capacitor life extension control method, wherein the electrolytic capacitor is connected to a power processing module and a load module, and is used to filter the output of the power processing module and input it to the load module, and the device includes:

[0019] A corresponding relationship generating unit, used for establishing a corresponding relationship between the input voltage of the power processing module and the input limiting power of the load module;

[0020] A power acquisition unit, used to acquire the real-time input voltage corresponding to the power processing module, so as to acquire the input limit power of the load module according to the real-time input voltage of the power processing module and the corresponding relationship;

[0021] The power adjustment unit is used to adjust the working state of the load module according to the input limit power of the load module so that the output power of the power processing module is not greater than the input limit power of the compressor.

[0022] The present invention also constructs a computer storage medium on which a computer program is stored. When the computer program is executed by a processor, the method described above is implemented.

[0023] The present invention also constructs an electronic device, comprising a memory and a processor;

[0024] The memory is used to store computer programs;

[0025] The processor is configured to execute the computer program to implement the method described above.

[0026] The implementation of the electrolytic capacitor life extension control method and related equipment of the present invention has the following beneficial effects: it can extend the service life of the electrolytic capacitor without increasing the circuit cost, thereby ensuring the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0028] Figure 1 It is a program flow chart of an embodiment of a method for controlling the life extension of an electrolytic capacitor according to the present invention;

[0029] Figure 2 is a schematic diagram of the connection relationship of electrolytic capacitors in one embodiment of the present invention;

[0030] Figure 3 It is a logic block diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0032] like Figure 1 As shown, an embodiment of a method for controlling the life extension of an electrolytic capacitor of the present invention is disclosed. Figure 1In an embodiment of a method for controlling the life extension of an electrolytic capacitor of the present invention, the electrolytic capacitor is connected to a power processing module and a load module, and is used to filter the output of the power processing module and input it to the load module. The method specifically includes the following steps: S1. Establishing a correspondence between the input voltage of the power processing module and the input limiting power of the load module; S2. Obtaining the real-time input voltage corresponding to the power processing module, so as to obtain the input limiting power of the load module according to the real-time input voltage of the power processing module and the corresponding relationship; S3. Adjusting the working state of the load module according to the input limiting power of the load module so that the output power of the power processing module is not greater than the input limiting power of the load module. Figure 2 As shown, the input end of the power processing module is connected to the mains input, and the output end of the power processing module is connected to the electrolytic capacitor, which is used to filter the output end of the power processing module and then input it to the input end of the load module. In a specific connection circuit, the first end of the electrolytic capacitor is simultaneously connected to the output end of the power processing module and the input end of the load module, and the second end of the electrolytic capacitor is grounded. In another specific circuit, the power processing module may include a protection circuit and a rectifier circuit. In a specific embodiment, the protection circuit may include an EMI protection circuit, and the rectifier circuit may include a single-phase full-wave rectifier bridge.

[0033] Based on step S1, the corresponding relationship between the input voltage of the power processing module and the input limiting power of the load module can be established first. Usually, when the input voltage of the power processing module is reduced, in order to ensure the input power of the load module, the power processing module will increase the output current, and the increase in output current will cause the input ripple current of the filter capacitor to increase, and the large ripple current will cause damage to the electrolytic capacitor. At this time, the input limiting power of the load module can be set according to the input voltage of the power processing module to ensure that the input power of the load module will not exceed the input limiting power under the input voltage. When the input power of the load module is limited, even if the input voltage of the power processing module is reduced, the output current of the power processing module will not increase excessively, so that the input ripple circuit of the electrolytic capacitor remains within the safe range allowed by the device. It can be understood that after the circuit design is completed, the hardware parameters of the power processing module and the load module can be determined, and the ripple allowable range of the electrolytic capacitor can also be determined, so the corresponding relationship between the input voltage of the power processing module and the input limiting power of the load module can be obtained based on the relationship between the three. Simply understand that when the hardware circuit has been determined, the above-mentioned corresponding relationship can also be set in advance according to actual requirements.

[0034] Based on step S2 and step S3, in the actual circuit operation process, the input voltage of the power processing module is monitored in real time to obtain the real-time input voltage of the power processing module, and the input limit power of the load module is obtained according to the real-time input voltage and the corresponding relationship obtained above. After obtaining the input limit power of the load module, the working state of the load module can be adjusted so that the output power of the power processing module is not greater than the input limit power of the load module. Specifically, it can be determined whether the working state of the load module needs to be adjusted according to the actual output power of the power processing module. In one embodiment, when the actual output power of the power processing module is less than or equal to the input limit power of the load module, it is actually not necessary to adjust the working state of the load module at this time. That is, only when the actual output power of the current power processing module is greater than the input limit power of the load module, the working state of the load module needs to be adjusted so that the actual output power of the power processing module is not greater than the input limit power of the load module. Through this process, the ripple current of the electrolytic capacitor can be controlled to be in a safe range, and the heating and failure rate of the electrolytic capacitor under this working condition are effectively controlled. In the end, not only can the service life of the electrolytic capacitor be extended, but also the reliability of the entire product can be improved.

[0035] Optionally, in one embodiment, based on the above step S2, the real-time input voltage corresponding to the power processing module is obtained, including: obtaining the bus voltage corresponding to the power processing module, so as to obtain the real-time input voltage corresponding to the power processing module according to the bus voltage. Specifically, since the input end of the power processing module is usually directly connected to the mains input, in this embodiment, the bus voltage can be obtained by detecting the bus input corresponding to the power processing module. Among them, the bus input can also be understood as the input to the electrolytic capacitor, and the process of detecting the bus voltage can be obtained by detecting the voltage across the two ends of the electrolytic capacitor. Thus, the mains input of the power processing module is fitted, that is, the real-time input voltage of the power processing module is obtained.

[0036] On the basis of the above, the real-time input voltage corresponding to the power processing module is obtained according to the bus voltage, including: obtaining the peak value of the bus voltage, and obtaining the real-time input voltage according to the formula VAC=k1*Vdc_peak / 1.414, wherein VAC is the real-time input voltage, Vdc_peak is the peak voltage of the bus voltage, and k1 is the first preset fitting coefficient. That is, the input voltage of the power processing module can be obtained according to a specific fitting formula. The bus voltage VDC is monitored by software, the voltage peak value thereof is obtained, and the peak value is low-pass filtered to obtain the peak voltage Vdc_peak of the clean bus voltage. The first preset fitting coefficient can be a suitable constant and is pre-set. In a specific embodiment, the first preset fitting coefficient k1 can be set close to 1, for example, a value between 0.9 and 1.1.

[0037] Optionally, in one embodiment, for example, in an air conditioning device, the load module may include a compressor. In step S3, the operation state of the load module is adjusted according to the input limit power of the load module so that the output power of the power processing module is not greater than the input limit power of the load module, including: obtaining the estimated power of the compressor, and when the estimated power of the compressor is greater than the input limit power of the compressor, adjusting the speed of the compressor according to the difference between the estimated power of the compressor and the input limit power of the compressor, so that the output power of the power processing module is the input limit power. Specifically, during the operation of the compressor, the estimated power to be reached by the compressor is obtained. When the estimated power of the compressor is greater than the input limit power of the compressor, it means that the output current of the power processing module is too large at this time. At this time, it is necessary to adjust the speed of the compressor, for example, reduce the speed of the compressor, so that the actual power of the compressor is reduced, and finally the input power of the power processing module is limited to the input limit power of the compressor. In one embodiment, in addition to the compressor, the load module may also include peripheral circuits such as a three-phase inverter bridge, an MCU, a drive unit, a bus voltage detection unit, a motor current detection unit, and main working circuits such as a three-phase AC motor. The three-phase AC motor includes a compressor. In air-conditioning equipment, the compressor is the main workload, so the impact of the compressor on the electrolytic capacitor is considered.

[0038] Further, on the basis of the above, the estimated power of the compressor is obtained, including: obtaining the estimated power of the compressor according to Pinv=K2*3 / 2(VD*ID+VQ*IQ), wherein Pinv is the estimated power of the compressor, VD is the direct-axis voltage of the compressor, ID is the direct-axis current of the compressor, VQ is the quadrature-axis voltage of the compressor, IQ is the quadrature-axis current of the compressor, and K2 is the second preset fitting coefficient. That is, the estimated power of the compressor can be obtained according to a specific fitting formula. The direct-axis voltage of the compressor, the direct-axis current of the compressor, the quadrature-axis voltage of the compressor and the quadrature-axis current of the compressor are monitored by software, and then the estimated power of the compressor is obtained according to the above fitting formula. The second preset fitting coefficient can be a suitable constant and is pre-set. In a specific embodiment, the second preset fitting coefficient k1 can be set close to 1, for example, between 0.8 and 1.2.

[0039] In addition, in an electronic device of the present invention, it is used to implement the above electrolytic capacitor life extension control method, wherein the electrolytic capacitor is connected to a power processing module and a load module, and is used to filter the output of the power processing module and input it to the load module, such as Figure 3As shown, the device includes: a corresponding relationship generating unit 301, which is used to establish a corresponding relationship between the input voltage of the power processing module and the input limiting power of the load module; a power obtaining unit 302, which is used to obtain the real-time input voltage corresponding to the power processing module, so as to obtain the input limiting power of the load module according to the real-time input voltage of the power processing module and the corresponding relationship; a power adjustment unit 303, which is used to adjust the working state of the load module according to the input limiting power of the load module so that the output power of the power processing module is not greater than the input limiting power of the compressor. That is, an electronic device of the present invention has the function of implementing the corresponding steps performed in the above method. Each function can be implemented by hardware, or by hardware executing the corresponding software. The corresponding hardware or software includes one or more modules corresponding to the above functions. That is, the steps in the above method are respectively executed by one or more modules. The specific coordination operation between the modules can refer to the specific process of the above method, which will not be repeated here.

[0040] In addition, an electronic device of the present invention may also include a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program to implement any of the above methods. Specifically, according to an embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed by an electronic device and when executed, it performs the above functions defined in the method of the embodiment of the present invention. The electronic device in the present invention can be a terminal such as a notebook, a desktop, a tablet computer, a smart phone, or a server.

[0041] In addition, a computer storage medium of the present invention stores a computer program thereon, and when the computer program is executed by a processor, any of the above methods is implemented. Specifically, it should be noted that the above-mentioned computer-readable medium of the present invention may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0042] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0043] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A method for controlling the life extension of an electrolytic capacitor, characterized in that: The electrolytic capacitor is connected to the power processing module and the load module, and is used to filter the output of the power processing module and input it to the load module. The method includes: Establishing a corresponding relationship between the input voltage of the power processing module and the input limiting power of the load module; Acquire the real-time input voltage corresponding to the power processing module, so as to acquire the input limit power of the load module according to the real-time input voltage of the power processing module and the corresponding relationship; The working state of the load module is adjusted according to the input limit power of the load module so that the output power of the power processing module is not greater than the input limit power of the load module.

2. The electrolytic capacitor life extension control method according to claim 1, characterized in that: The obtaining of the real-time input voltage corresponding to the power processing module includes: A bus voltage corresponding to the power processing module is obtained, so as to obtain a real-time input voltage corresponding to the power processing module according to the bus voltage.

3. The electrolytic capacitor life extension control method according to claim 2, characterized in that: The step of acquiring the real-time input voltage corresponding to the power processing module according to the bus voltage includes: The peak value of the bus voltage is obtained, and the real-time input voltage is obtained according to the formula VAC=k1*Vdc_peak / 1.414, wherein VAC is the real-time input voltage, Vdc_peak is the peak voltage of the bus voltage, and k1 is the first preset fitting coefficient.

4. The electrolytic capacitor life extension control method according to claim 3, characterized in that: The first preset fitting coefficient ranges from 0.9 to 1.

1.

5. The electrolytic capacitor life extension control method according to claim 1, characterized in that: The load module includes a compressor; The step of adjusting the working state of the load module according to the input limiting power of the load module so that the output power of the power processing module is not greater than the input limiting power of the load module includes: Obtain the estimated power of the compressor. When the estimated power of the compressor is greater than the input limit power of the compressor, adjust the speed of the compressor according to the difference between the estimated power of the compressor and the input limit power of the compressor, so that the output power of the power processing module is the input limit power of the compressor.

6. The electrolytic capacitor life extension control method according to claim 5, characterized in that: The method of obtaining the estimated power of the compressor includes: obtaining the estimated power of the compressor according to Pinv=K2*3 / 2(VD*ID+VQ*IQ), wherein Pinv is the estimated power of the compressor, VD is the direct-axis voltage of the compressor, ID is the direct-axis current of the compressor, VQ is the quadrature-axis voltage of the compressor, IQ is the quadrature-axis current of the compressor, and K2 is a second preset fitting coefficient.

7. The electrolytic capacitor life extension control method according to claim 6, characterized in that: The second preset fitting coefficient ranges from 0.8 to 1.

2.

8. An electronic device, characterized in that: Used to implement the electrolytic capacitor life extension control method according to any one of claims 1 to 7, wherein the electrolytic capacitor is connected to a power processing module and a load module, and is used to filter the output of the power processing module and input it to the load module, and the device includes: A corresponding relationship generating unit, used for establishing a corresponding relationship between the input voltage of the power processing module and the input limiting power of the load module; A power acquisition unit, used to acquire the real-time input voltage corresponding to the power processing module, so as to acquire the input limit power of the load module according to the real-time input voltage of the power processing module and the corresponding relationship; The power adjustment unit is used to adjust the working state of the load module according to the input limit power of the load module so that the output power of the power processing module is not greater than the input limit power of the compressor.

9. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: including memory and processor; The memory is used to store computer programs; The processor is configured to execute the computer program to implement the method according to any one of claims 1 to 7.

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