Parameter estimation method, device and equipment of DCDC converter and storage medium

Abstract

The invention provides a parameter estimation method, device and equipment for a DCDC converter and a storage medium, and relates to the technical field of DCDC converters, and the method comprises the steps: collecting a first input side parameter, an output voltage and an output current of the DCDC converter through a sampling circuit; the efficiency of the DCDC converter is determined according to the first input side parameter, the output voltage, the output current and a preset corresponding relation, and the preset corresponding relation comprises a corresponding relation between a target parameter of the DCDC converter and the efficiency; and determining a second input side parameter of the DCDC converter according to the efficiency, the first input side parameter, the output voltage and the output current. According to the invention, the number of sampling circuits is reduced, so that the circuit complexity, the circuit layout difficulty and the product cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of DC-DC converter technology, and more specifically, to a method, apparatus, device, and storage medium for estimating parameters of a DC-DC converter. Background Technology

[0002] A DC-DC (Direct Current to Direct Current) converter is a power electronic device used to convert one DC voltage to another, and it is widely used in power electronic systems. To control and protect the DC-DC converter, it is necessary to monitor the parameters (such as voltage and current) on both the input and output sides.

[0003] In related technologies, sampling circuits are typically used to sample circuit parameters. In order to sample the voltage and current on the input and output sides of the DC-DC converter, four sampling circuits are required. The design of multiple sampling circuits increases the circuit complexity of the DC-DC converter, thereby increasing the difficulty of circuit layout. Furthermore, the design of multiple sampling circuits increases the product cost of the DC-DC converter. Summary of the Invention

[0004] The problem addressed by this invention is how to reduce the circuit complexity and product cost of DC-DC converters.

[0005] To address the aforementioned problems, this invention provides a method, apparatus, device, and storage medium for estimating parameters of a DC-DC converter.

[0006] In a first aspect, the present invention provides a method for estimating the parameters of a DC-DC converter, comprising: The sampling circuit is used to collect the first input side parameters, output voltage, and output current of the DC-DC converter. The efficiency of the DC-DC converter is determined based on the first input side parameters, the output voltage, the output current, and a preset correspondence, wherein the preset correspondence includes the correspondence between the target parameters of the DC-DC converter and the efficiency; The second input-side parameter of the DC-DC converter is determined based on the efficiency, the first input-side parameter, the output voltage, and the output current, wherein when the first input-side parameter is the input voltage, the second input-side parameter is the input current; and when the first input-side parameter is the input current, the second input-side parameter is the input voltage.

[0007] Optionally, the target parameters of the DC-DC converter include the duty cycle and output current of the DC-DC converter; determining the efficiency of the DC-DC converter based on the first input side parameters, the output voltage, the output current, and a preset correspondence includes: The duty cycle of the DC-DC converter is determined based on the first input side parameters and the output voltage; The efficiency is determined based on the duty cycle and the output current in the preset correspondence.

[0008] Optionally, before determining the efficiency of the DC-DC converter based on the first input-side parameters, the output voltage, the output current, and a preset correspondence, the method further includes: Acquire the combination of influencing factors of the target DC-DC converter under different operating conditions, wherein the combination of influencing factors includes the input voltage, output voltage, output current and efficiency of the target DC-DC converter; For each output current, the duty cycle is determined based on the input voltage and the output voltage corresponding to the output current, and the duty cycle is fitted with the efficiency to obtain the fitting formula corresponding to the output current; Multiple different duty cycles are determined, and for each duty cycle, the efficiency corresponding to the duty cycle is determined according to the fitting formula corresponding to each output current. The preset correspondence is established based on the correspondence between the duty cycle, the output current, and the efficiency.

[0009] Optionally, before acquiring the combination of influencing factors data for the target DC-DC converter under different operating conditions, the method further includes: Select a predetermined number of samples from the same batch of DC-DC converters; The efficiency of each sample is tested under different operating conditions, and the sample with the median efficiency among all the samples is selected as the target DC-DC converter based on the test results.

[0010] Optionally, after establishing the preset correspondence based on the correspondence between the duty cycle, the output current, and the efficiency, the method further includes: Based on the test results obtained from testing the efficiency of each of the samples under different working conditions, determine the efficiency extreme value among all the samples; Obtain the first input-side parameters, the output voltage, the output current, and the actual efficiency of the efficiency extreme value device under different operating conditions; The duty cycle is determined based on the first input side parameters and the output voltage, and the output efficiency is determined based on the duty cycle and the output current in the preset correspondence. The output efficiency is compared with the actual efficiency, and the accuracy of the output efficiency is verified based on the comparison results.

[0011] Optionally, determining the second input-side parameters of the DC-DC converter based on the efficiency, the first input-side parameters, the output voltage, and the output current includes: Determine the first product of the output voltage and the output current, and the second product of the first input-side parameter and the efficiency. Divide the first product by the second product to obtain the second input-side parameter.

[0012] Optionally, the step of using a sampling circuit to acquire the first input-side parameters, output voltage, and output current of the DC-DC converter includes: The sampling circuit is connected to the automatic data acquisition tool via a bus, and the automatic data acquisition tool acquires the first input side parameters, the output voltage, and the output current collected by the sampling circuit.

[0013] Secondly, the present invention provides a parameter estimation device for a DC-DC converter, comprising: The acquisition module is used to acquire the first input side parameters, output voltage, and output current of the DC-DC converter using the sampling circuit; The query module is used to determine the efficiency of the DC-DC converter based on the first input side parameters, the output voltage, the output current, and a preset correspondence, wherein the preset correspondence includes the correspondence between the target parameters of the DC-DC converter and the efficiency; The calculation module is used to determine the second input-side parameters of the DC-DC converter based on the efficiency, the first input-side parameters, the output voltage, and the output current, wherein when the first input-side parameter is the input voltage, the second input-side parameter is the input current; and when the first input-side parameter is the input current, the second input-side parameter is the input voltage.

[0014] Thirdly, the present invention provides an electronic device, including a memory and a processor; The memory is used to store computer programs; The processor is configured to, when executing the computer program, implement the parameter estimation method for the DC-DC converter as described in the first aspect.

[0015] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the parameter estimation method for a DC-DC converter as described in the first aspect.

[0016] The beneficial effects of the parameter estimation method, apparatus, device, and storage medium for the DC-DC converter of the present invention are as follows: The first input-side parameters, output voltage, and output current of the DC-DC converter are acquired using sampling circuits. Each of these parameters is acquired through a corresponding sampling circuit, thus requiring only three sampling circuits compared to the four-circuit requirement in existing technologies. This reduces circuit complexity, layout difficulty, and product cost. The efficiency of the DC-DC converter is determined based on the first input-side parameters, output voltage, and output current within a preset correspondence. This preset correspondence is obtained through pre-calibration, enabling rapid and accurate determination of the converter's efficiency. The second input-side parameters can be determined based on the efficiency calculation formula, the efficiency, the first input-side parameters, the output voltage, and the output current. The first input-side parameter is either the input voltage or the input current, and the second output parameter is either the input voltage or the input current excluding the first input-side parameter. Estimating the second input-side parameter ensures the acquisition of the input-side voltage and current, as well as the output-side voltage and current. Furthermore, reducing the number of sampling circuits lowers circuit complexity, layout difficulty, and product cost. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating a parameter estimation method for a DC-DC converter according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a process for establishing a preset correspondence according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a parameter estimation device for a DC-DC converter according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The names of the messages or information exchanged between the multiple devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0023] In related technologies, the input voltage, input current, output voltage, and output current of a DC-DC converter all require corresponding sampling circuits to acquire data. Specifically, the input current sampling circuit acquires the input current, the input voltage sampling circuit acquires the input voltage, the output current sampling circuit acquires the output current, and the output voltage sampling circuit acquires the output voltage. Therefore, four sampling circuits are required. However, each sampling circuit includes isolation chips, peripheral sampling circuits, etc., which increases the complexity of the entire DC-DC circuit, the difficulty of circuit layout, and the product cost with each additional sampling circuit.

[0024] To address the problems existing in the aforementioned related technologies, this embodiment provides a method, apparatus, device, and storage medium for estimating parameters of a DC-DC converter.

[0025] like Figure 1 As shown in the figure, an embodiment of the present invention provides a parameter estimation method for a DC-DC converter, comprising: S100 uses a sampling circuit to acquire the first input side parameters, output voltage, and output current of the DC-DC converter.

[0026] Specifically, the first input side parameters include input voltage or input current. The first input side parameters, output voltage, and output current each correspond to one sampling circuit. Only three sampling circuits are needed. Compared with the prior art, which requires four sampling circuits for parameter acquisition, the solution in this embodiment can reduce one sampling circuit, thereby reducing the complexity of the entire DCDC circuit, the difficulty of circuit layout, and the product cost.

[0027] When the input side of the DC-DC converter is the high-voltage side, the output side is the low-voltage side; when the input side of the DC-DC converter is the low-voltage side, the output side is the high-voltage side.

[0028] S200, the efficiency of the DC-DC converter is determined based on the first input side parameters, the output voltage, the output current, and a preset correspondence, wherein the preset correspondence includes the correspondence between the target parameters of the DC-DC converter and the efficiency.

[0029] Specifically, a pre-established correspondence between the target parameters and the efficiency of the DC-DC converter is established. This pre-defined correspondence can be stored and represented in tables or graphs. The target parameters may include the first input parameters, output voltage, and output current. In this case, the pre-defined correspondence is the relationship between the combination of the first input parameters, output voltage, and output current and the efficiency. When determining the efficiency, the efficiency corresponding to the current combination of the first input parameters, output voltage, and output current is directly found in the pre-defined correspondence.

[0030] The target parameter can also be a conversion parameter calculated or converted from the first input side parameters, output voltage, and output current. In this case, the preset correspondence is the correspondence between the conversion parameter and the efficiency, which can save data storage memory resources. When determining the efficiency, the current conversion parameter is first calculated based on the current first input side parameters, output voltage, and output current, and then the efficiency corresponding to the current conversion parameter is found in the preset correspondence.

[0031] S300, the second input-side parameter of the DC-DC converter is determined based on the efficiency, the first input-side parameter, the output voltage, and the output current, wherein when the first input-side parameter is the input voltage, the second input-side parameter is the input current; when the first input-side parameter is the input current, the second input-side parameter is the input voltage.

[0032] Specifically, based on the efficiency calculation formula of the DC-DC converter, the second input side parameters are calculated by substituting the efficiency, the first input side parameters, the output voltage, and the output current.

[0033] In this embodiment, sampling circuits are used to acquire the first input-side parameters, output voltage, and output current of the DC-DC converter. Each of these parameters is acquired through a corresponding sampling circuit, thus requiring only three sampling circuits. Compared to the four sampling circuits required in existing technologies, this reduces circuit complexity, layout difficulty, and product cost. The efficiency of the DC-DC converter is determined based on a preset correspondence between the first input-side parameters, output voltage, and output current. This preset correspondence is obtained through pre-calibration, enabling rapid and accurate determination of the converter's efficiency. The second input-side parameters can be determined based on the efficiency calculation formula, the first input-side parameters, output voltage, and output current. The first input-side parameter is either the input voltage or the input current, and the second output parameter is either the input voltage or the input current excluding the first input-side parameter. Estimating the second input-side parameter ensures the acquisition of both input-side and output voltage and current. Furthermore, reducing the number of sampling circuits further lowers circuit complexity, layout difficulty, and product cost.

[0034] Optionally, the target parameters of the DC-DC converter include the duty cycle and output current of the DC-DC converter; determining the efficiency of the DC-DC converter based on the first input side parameters, the output voltage, the output current, and a preset correspondence includes: The duty cycle of the DC-DC converter is determined based on the first input side parameters and the output voltage; The efficiency is determined based on the duty cycle and the output current in the preset correspondence.

[0035] Specifically, when the target parameters of the DC-DC converter include the duty cycle and output current of the DC-DC converter, the preset correspondence is the correspondence between the parameter combination of duty cycle and output current and efficiency. Then, the current duty cycle of the DC-DC converter is determined first, and then the corresponding efficiency is found in the preset correspondence based on the current duty cycle and output current. Specifically, the efficiency can be determined by looking up a table through linear interpolation.

[0036] When the first input parameter is the input voltage, the duty cycle of the DC-DC converter is determined based on the input and output voltages. For example, for a DC-DC converter using a transformer, since the current topology of the DC-DC converter is a hard switch, the input voltage-output voltage relationship satisfies the following under constant load conditions: , in, For output voltage, Input voltage, For transformers with a fixed turns ratio, To control the duty cycle of a DC-DC converter, the duty cycle can be determined based on the input and output voltages.

[0037] When the first input parameter is the input current, the corresponding duty cycle can be determined based on the output voltage and the PI (proportional-integral) control algorithm. Specifically, since the closed-loop control system of the DC-DC converter monitors the output voltage and compares the actual value of the output voltage with the set value, it uses the PI controller to generate an error signal and then adjusts the duty cycle to make the output voltage reach the set value. Therefore, the duty cycle corresponding to the current output voltage can be directly determined.

[0038] Optionally, such as Figure 2 As shown, before determining the efficiency of the DC-DC converter based on the first input-side parameters, the output voltage, the output current, and a preset correspondence, the method further includes: S11, Obtain the combination of influencing factors of the target DC-DC converter under different operating conditions, wherein the combination of influencing factors includes the input voltage, output voltage, output current and efficiency of the target DC-DC converter; S12, for each output current, the duty cycle is determined based on the input voltage and the output voltage corresponding to the output current, and the duty cycle is fitted with the efficiency to obtain the fitting formula corresponding to the output current; S13, determine multiple different duty cycles, and for each duty cycle, determine the efficiency corresponding to the duty cycle according to the fitting formula corresponding to each output current; S14, establish the preset correspondence based on the correspondence between the duty cycle, the output current and the efficiency.

[0039] For example, a power meter is used for data acquisition. The data acquisition conditions can be combined according to the following: output voltage {maximum output design voltage, minimum output design voltage}, output current {0.3, 0.45, 0.6, 0.75, 1, 1.5, 2.5, 3.5, 5, 6.5, 8.5, 10.5, ..., rated current}, and input voltage {minimum input voltage, ..., 450, 500, 550, 600, ..., maximum input voltage}, and data under different conditions can be collected.

[0040] The collected data set of influencing factors should include the actual output voltage, actual output current, actual input voltage, and actual efficiency measured by the power meter. It may also include signals such as output voltage, output current, input voltage, duty cycle, and DCDC temperature reported by the DCDC converter to the automatic data acquisition tool via bus (e.g., CAN bus). The actual data measured by the power meter can be used to verify the data reported by the DCDC converter to the automatic data acquisition tool.

[0041] Polynomial fitting was performed on the duty cycle and efficiency data collected for each output current in the output current set {0.3, 0.45, 0.6, 0.75, 1, 1.5, 2.5, 3.5, 5, 6.5, 8.5, 10.5, ..., rated current} to obtain the output current sets {0.3, 0.45, 0.6, 0.75, 1, 1.5, 2.5, 3.5, 5, 6.5, 8.5, 10.5, ..., rated current}. The fitting formulas for each output current in the rated current are {y1, y2, y3, y4, y5, y6, y7, y8, y9, y11, y12, y13, ..., yn}. Multiple predetermined duty cycle values ​​{0.015, 0.025, 0.05, 0.1, 0.12, 0.14, 0.16, 0.2, ..., Dn} are substituted into the fitting formulas for different output currents to obtain the efficiency under different output currents. 、 、 、 、 、…、 Finally, a preset correspondence is established based on the efficiency values ​​under different output currents and duty cycles.

[0042] Specifically, each output current in the set of output currents {0.3, 0.45, 0.6, 0.75, 1, 1.5, 2.5, 3.5, 5, 6.5, 8.5, 10.5, ..., rated current} can be used as a column, and multiple different duty cycle values ​​{0.015, 0.025, 0.05, 0.1, 0.12, 0.14, 0.16, 0.2, ..., Dn} can be used as rows to construct a table (as shown in Table 1). The corresponding efficiency is then filled into the constructed table to obtain a table corresponding to the preset relationship.

[0043]

[0044] Table 1. Constructed Table It is worth noting that the values ​​and intervals of the rows and columns in the table are set based on efficiency test data. The reasonableness of the row and column values ​​directly affects the accuracy of efficiency lookup. The closer the intervals, the more accurate the efficiency value obtained by linear interpolation lookup. Preferably, the difference between the actual efficiency measured by the power meter and the efficiency determined by the data reported by the DCDC converter can be calculated. Where the difference is large, the data interval can be set closer, and where the difference is small, the data interval can be set more sparse. For example, when the difference is greater than a first preset threshold, multiple duty cycles within a preset range corresponding to the current actual efficiency are set as rows, and multiple output currents within a preset range corresponding to the current actual efficiency are set as columns. The first preset threshold and preset range are set according to the specific situation.

[0045] In this optional embodiment, the relationship between the input voltage, output voltage, output current and efficiency of the DC-DC converter is simplified to the relationship between duty cycle, output current and efficiency. This simplifies the calibration process of the preset correspondence, reduces the work of calibration data acquisition and processing, and saves data storage memory resources.

[0046] The main factors affecting the operating efficiency of a DC-DC converter include input voltage, output voltage, output current, temperature, and product consistency. These factors can be analyzed in advance. The efficiency impact analysis test conditions are: ambient temperature {-35℃, 25℃, 55℃}; test samples {maximum, median, minimum}; input voltage {minimum input design voltage, ..., 450, 500, 550, 600, ..., maximum input design voltage}; output voltage {minimum output design voltage, rated output voltage, maximum output design voltage}; and output current {0.3, 0.45, 0.6, 0.75, 1...}. The rated current is defined as follows: 1.5, 2.5, 3.5, 5, 6.5, 8.5, 10.5, ..., Rated Current}, where the output voltage, output current, and input voltage are measured by a power meter, resulting in higher and more stable sampling accuracy. It also supports the development of automatic data acquisition tools. The efficiency of the DCDC converter is tested using a single-variable control method. Analysis of the test data shows that the input voltage, output voltage, and output current have an impact of more than 5% on efficiency, while temperature and product consistency have an impact of less than 1%. Since the impact of temperature and product consistency on efficiency is relatively small, their effects are not considered in this embodiment when estimating efficiency.

[0047] Optionally, before acquiring the combination of influencing factors data for the target DC-DC converter under different operating conditions, the method further includes: Select a predetermined number of samples from the same batch of DC-DC converters; The efficiency of each sample is tested under different operating conditions, and the sample with the median efficiency among all the samples is selected as the target DC-DC converter based on the test results.

[0048] For example, 20 samples can be selected from the same batch of DC-DC converters. For each sample, actual efficiency tests are conducted under the following conditions: room temperature, input voltage set to the maximum design value, output voltage set to the rated value, and output current set to 5% load, 10% load, 15% load, 20% load, 50% load, 75% load, and 100% load (i.e., the output current is set to 5%, 10%, ..., 100% of the maximum output current). The median, maximum, and minimum efficiency samples can be identified. Specifically, the efficiency of each sample under 5% load, 10% load, 15% load, 20% load, 50% load, 75% load, and 100% load can be obtained through testing. The average efficiency of each sample under different loads is determined, and then the median efficiency sample (i.e., the sample with the middle average efficiency), the maximum efficiency sample (i.e., the sample with the highest average efficiency), and the minimum efficiency sample (i.e., the sample with the lowest average efficiency) are determined by comparing the average efficiencies.

[0049] In this optional embodiment, using an efficiency median device to collect data for the calibration of the preset correspondence table can reduce the impact of product consistency, improve data coverage, thereby improving the calibration accuracy of the preset correspondence, and thus improving the estimation accuracy of subsequent DC-DC converter parameters.

[0050] Optionally, after establishing the preset correspondence based on the correspondence between the duty cycle, the output current, and the efficiency, the method further includes: Based on the test results obtained from testing the efficiency of each of the samples under different working conditions, determine the efficiency extreme value among all the samples; Obtain the first input-side parameters, the output voltage, the output current, and the actual efficiency of the efficiency extreme value device under different operating conditions; The duty cycle is determined based on the first input side parameters and the output voltage, and the output efficiency is determined based on the duty cycle and the output current in the preset correspondence. The output efficiency is compared with the actual efficiency, and the accuracy of the output efficiency is verified based on the comparison results.

[0051] Specifically, efficiency extremes include efficiency maximums and efficiency minimums. To simultaneously verify the impact of temperature and product consistency on efficiency accuracy, the actual efficiency of the efficiency extremes at different temperatures can be used to verify the accuracy of the estimated efficiency.

[0052] Specifically, the system acquires the first input parameters, output voltage, output current, and actual efficiency of the efficiency extreme value component at different temperatures (e.g., high temperature, room temperature, and low temperature). Based on the first input parameters and output voltage, the duty cycle is determined. Then, based on the duty cycle and output current, linear interpolation is performed in a preset correspondence to obtain the output efficiency. The accuracy of the output efficiency is verified by comparing it with the actual efficiency. For example, the absolute value of the difference between the output efficiency and the actual efficiency is determined and compared with a preset efficiency threshold. If the absolute value is less than the preset efficiency threshold, the output efficiency accuracy is high; if the absolute value is greater than or equal to the preset efficiency threshold, the output efficiency accuracy is low. Further analysis can be conducted to determine whether the issue stems from product inconsistency, problems with the calibration process, or problems with the data acquisition process.

[0053] In this optional embodiment, the estimated output efficiency is verified by using the actual efficiency of the efficiency extremum component under different operating conditions. This can verify the impact of operating conditions such as temperature and product consistency on efficiency accuracy, as well as verify the data acquisition process and the calibration process of the preset correspondence. This makes it easier to detect problems in a timely manner when the estimation accuracy is poor, thereby improving the efficiency of correction.

[0054] Optionally, determining the second input-side parameters of the DC-DC converter based on the efficiency, the first input-side parameters, the output voltage, and the output current includes: Determine the first product of the output voltage and the output current, and the second product of the first input-side parameter and the efficiency. Divide the first product by the second product to obtain the second input-side parameter.

[0055] Specifically, the efficiency calculation formula for a DC-DC converter is as follows: , in, Output voltage, in volts (V). Output current, in amperes (A); This refers to the output power. Input voltage, in volts (V); Input current, in amperes (A); Input power; The efficiency of the DC-DC converter is given by the formula. In this formula, either the input voltage or the input current can be obtained through a sampling circuit. The output voltage and output current are also obtained through a sampling circuit. The efficiency of the DC-DC converter is obtained by linear interpolation using a preset correspondence table. Based on this formula, the value of the other signal between the input voltage and the input current can be calculated.

[0056] Optionally, the step of using a sampling circuit to acquire the first input-side parameters, output voltage, and output current of the DC-DC converter includes: The sampling circuit is connected to the automatic data acquisition tool via a bus, and the automatic data acquisition tool acquires the first input side parameters, the output voltage, and the output current collected by the sampling circuit.

[0057] Specifically, the bus may include CAN bus, SPI bus, and EtherCAT bus, etc. This embodiment preferably uses a CAN bus. Software developed using the CAPL language in CANoe (CAN open environment, CAN bus development environment) can be deployed in an automatic data acquisition tool. The automatic data acquisition tool may include a computer, server, etc. The tool automatically acquires data collected by the sampling circuit through the bus and processes it based on the acquired first input side parameters, output voltage, and output current. It determines the corresponding efficiency in a preset correspondence and automatically calculates the second input side parameters based on the first input side parameters, output voltage, output current, and efficiency.

[0058] In this optional embodiment, an automatic data acquisition tool is used to automatically acquire the data collected by the sampling circuit, eliminating the need for manual data acquisition, thus improving data acquisition efficiency and reducing manual workload.

[0059] like Figure 3 As shown, an embodiment of the present invention provides a parameter estimation device 300 for a DC-DC converter, comprising: The acquisition module 310 is used to acquire the first input side parameters, output voltage and output current of the DC-DC converter using the sampling circuit; The query module 320 is used to determine the efficiency of the DC-DC converter based on the first input side parameters, the output voltage, the output current and a preset correspondence, wherein the preset correspondence includes the correspondence between the target parameters of the DC-DC converter and the efficiency; The calculation module 330 is used to determine the second input side parameter of the DC-DC converter based on the efficiency, the first input side parameter, the output voltage, and the output current, wherein when the first input side parameter is the input voltage, the second input side parameter is the input current; and when the first input side parameter is the input current, the second input side parameter is the input voltage.

[0060] The advantages of the parameter estimation device for the DC-DC converter in this embodiment compared to the prior art are the same as the advantages of the parameter estimation method for the DC-DC converter described above compared to the prior art.

[0061] Optionally, the target parameters of the DC-DC converter include the duty cycle and output current of the DC-DC converter; the query module 320 is specifically used to: determine the duty cycle of the DC-DC converter according to the first input side parameters and the output voltage; and determine the efficiency according to the duty cycle and the output current in the preset correspondence.

[0062] Optionally, the parameter estimation device for the DC-DC converter further includes a calibration module, which is used to: select a preset number of samples from the same batch of DC-DC converters; test the efficiency of each sample under different operating conditions; and select the median efficiency sample among all the samples as the target DC-DC converter based on the test results.

[0063] Optionally, the calibration module is further configured to: acquire a combination of influencing factors of the target DC-DC converter under different operating conditions, wherein the combination of influencing factors includes the input voltage, output voltage, output current, and efficiency of the target DC-DC converter; for each output current, determine the duty cycle based on the input voltage and output voltage corresponding to the output current, and fit the duty cycle with the efficiency to obtain a fitting formula corresponding to the output current; determine multiple different duty cycles, and for each duty cycle, determine the efficiency corresponding to the duty cycle based on the fitting formula corresponding to each output current; and establish the preset correspondence relationship based on the correspondence relationship between the duty cycle, the output current, and the efficiency.

[0064] Optionally, the parameter estimation device for the DC-DC converter further includes a verification module, which is used to: determine the efficiency extremum device among all the samples based on the test results; obtain the first input-side parameters, the output voltage, the output current, and the actual efficiency of the efficiency extremum device under different operating conditions; determine the duty cycle based on the first input-side parameters and the output voltage; determine the output efficiency based on the duty cycle and the output current in the preset correspondence; compare the output efficiency with the actual efficiency; and verify the efficiency accuracy of the output efficiency based on the comparison result.

[0065] Optionally, the calculation module 330 is specifically used to: determine a first product of the output voltage and the output current, and a second product of the first input-side parameter and the efficiency, and divide the first product by the second product to obtain the second input-side parameter.

[0066] Optionally, the acquisition module 310 is specifically used to: connect the sampling circuit and the automatic data acquisition tool via a bus, and acquire the first input side parameters, the output voltage and the output current acquired by the sampling circuit through the automatic data acquisition tool.

[0067] like Figure 4 As shown, an electronic device 400 provided in this embodiment of the invention includes a memory 410 and a processor 420; the memory 410 is used to store a computer program; the processor 420 is used to implement the parameter estimation method of the DC-DC converter as described above when the computer program is executed.

[0068] Alternatively, an electronic device 400 includes a memory 410 and a processor 420 coupled to the memory 410; the memory 410 is configured to store a computer program; and the processor 420 is configured to perform the following operations when the computer program is executed: The sampling circuit is used to collect the first input side parameters, output voltage, and output current of the DC-DC converter. The efficiency of the DC-DC converter is determined based on the first input side parameters, the output voltage, the output current, and a preset correspondence, wherein the preset correspondence includes the correspondence between the target parameters of the DC-DC converter and the efficiency; The second input-side parameter of the DC-DC converter is determined based on the efficiency, the first input-side parameter, the output voltage, and the output current, wherein when the first input-side parameter is the input voltage, the second input-side parameter is the input current; and when the first input-side parameter is the input current, the second input-side parameter is the input voltage.

[0069] This invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the parameter estimation method for a DC-DC converter as described above.

[0070] Alternatively, a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the following operations: The sampling circuit is used to collect the first input side parameters, output voltage, and output current of the DC-DC converter. The efficiency of the DC-DC converter is determined based on the first input side parameters, the output voltage, the output current, and a preset correspondence, wherein the preset correspondence includes the correspondence between the target parameters of the DC-DC converter and the efficiency; The second input-side parameter of the DC-DC converter is determined based on the efficiency, the first input-side parameter, the output voltage, and the output current, wherein when the first input-side parameter is the input voltage, the second input-side parameter is the input current; and when the first input-side parameter is the input current, the second input-side parameter is the input voltage.

[0071] The present invention will now be described an electronic device 400 that can serve as a server or client of the present invention, which is an example of a hardware device that can be applied to various aspects of the present invention. Electronic device 400 is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 400 can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0072] Electronic device 400 includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) or a computer program loaded from a storage unit into random access memory (RAM). The RAM may also store various programs and data required for device operation. The computing unit, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0073] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc. In this application, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention according to actual needs. Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units can be implemented in hardware or as software functional units.

[0074] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for estimating parameters of a DC-DC converter, characterized in that, include: The sampling circuit is used to collect the first input side parameters, output voltage, and output current of the DC-DC converter. The efficiency of the DC-DC converter is determined based on the first input side parameters, the output voltage, the output current, and a preset correspondence, wherein the preset correspondence includes the correspondence between the target parameters of the DC-DC converter and the efficiency; The second input-side parameter of the DC-DC converter is determined based on the efficiency, the first input-side parameter, the output voltage, and the output current, wherein when the first input-side parameter is the input voltage, the second input-side parameter is the input current; and when the first input-side parameter is the input current, the second input-side parameter is the input voltage.

2. The parameter estimation method for a DC-DC converter according to claim 1, characterized in that, The target parameters of the DC-DC converter include the duty cycle and output current of the DC-DC converter; determining the efficiency of the DC-DC converter based on the first input side parameters, the output voltage, the output current, and a preset correspondence includes: The duty cycle of the DC-DC converter is determined based on the first input side parameters and the output voltage; The efficiency is determined based on the duty cycle and the output current in the preset correspondence.

3. The parameter estimation method for a DC-DC converter according to claim 2, characterized in that, Before determining the efficiency of the DC-DC converter based on the first input side parameters, the output voltage, the output current, and a preset correspondence, the method further includes: Acquire the combination of influencing factors of the target DC-DC converter under different operating conditions, wherein the combination of influencing factors includes the input voltage, output voltage, output current and efficiency of the target DC-DC converter; For each output current, the duty cycle is determined based on the input voltage and the output voltage corresponding to the output current, and the duty cycle is fitted with the efficiency to obtain the fitting formula corresponding to the output current; Multiple different duty cycles are determined, and for each duty cycle, the efficiency corresponding to the duty cycle is determined according to the fitting formula corresponding to each output current. The preset correspondence is established based on the correspondence between the duty cycle, the output current, and the efficiency.

4. The parameter estimation method for a DC-DC converter according to claim 3, characterized in that, Before acquiring the combination of influencing factors of the target DC-DC converter under different operating conditions, the method further includes: Select a predetermined number of samples from the same batch of DC-DC converters; The efficiency of each sample is tested under different operating conditions, and the sample with the median efficiency among all the samples is selected as the target DC-DC converter based on the test results.

5. The parameter estimation method for a DC-DC converter according to claim 4, characterized in that, After establishing the preset correspondence based on the correspondence between the duty cycle, the output current, and the efficiency, the method further includes: Based on the test results obtained from testing the efficiency of each of the samples under different working conditions, determine the efficiency extreme value among all the samples; Obtain the first input-side parameters, the output voltage, the output current, and the actual efficiency of the efficiency extreme value device under different operating conditions; The duty cycle is determined based on the first input side parameters and the output voltage, and the output efficiency is determined based on the duty cycle and the output current in the preset correspondence. The output efficiency is compared with the actual efficiency, and the accuracy of the output efficiency is verified based on the comparison results.

6. The parameter estimation method for a DC-DC converter according to any one of claims 1 to 5, characterized in that, Determining the second input-side parameters of the DC-DC converter based on the efficiency, the first input-side parameters, the output voltage, and the output current includes: Determine the first product of the output voltage and the output current, and the second product of the first input-side parameter and the efficiency. Divide the first product by the second product to obtain the second input-side parameter.

7. The parameter estimation method for a DC-DC converter according to any one of claims 1 to 5, characterized in that, The process of acquiring the first input-side parameters, output voltage, and output current of the DC-DC converter using a sampling circuit includes: The sampling circuit is connected to the automatic data acquisition tool via a bus, and the automatic data acquisition tool acquires the first input side parameters, the output voltage, and the output current collected by the sampling circuit.

8. A parameter estimation device for a DC-DC converter, characterized in that, include: The acquisition module is used to acquire the first input side parameters, output voltage, and output current of the DC-DC converter using the sampling circuit; The query module is used to determine the efficiency of the DC-DC converter based on the first input side parameters, the output voltage, the output current, and a preset correspondence, wherein the preset correspondence includes the correspondence between the target parameters of the DC-DC converter and the efficiency; The calculation module is used to determine the second input-side parameters of the DC-DC converter based on the efficiency, the first input-side parameters, the output voltage, and the output current, wherein when the first input-side parameter is the input voltage, the second input-side parameter is the input current; and when the first input-side parameter is the input current, the second input-side parameter is the input voltage.

9. An electronic device, characterized in that, Including memory and processor; The memory is used to store computer programs; The processor is configured to, when executing the computer program, implement the parameter estimation method for the DC-DC converter as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that, when executed by a processor, implements the parameter estimation method for the DC-DC converter as described in any one of claims 1 to 7.

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