CN110988754A - Magnetic characteristic parameter-based electric vehicle wireless charging system magnetic transmission component interoperability testing method - Google Patents
Magnetic characteristic parameter-based electric vehicle wireless charging system magnetic transmission component interoperability testing method Download PDFInfo
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Abstract
The invention provides a magnetic characteristic parameter-based interoperability test method for a magnetic transmission component of an electric automobile wireless charging system, which is used for evaluating the magnetic interoperability of a product TA. The test of any product uses the only gauge equipment, has avoided the blind cross test between different products. The evaluation index is a magnetic characteristic parameter, namely magnetic flux, passing through the gauge device. The test object is the open circuit voltage of the gauge apparatus. And on the premise that the output power reaches the standard, when the magnetic flux of the tested product and the magnetic flux of the gauge equipment meet the reference value area, the TA of the tested product is judged to pass the interoperability judgment, and the interoperability standard is met. Compared with the existing method, the method not only can greatly reduce the test workload, but also can provide the product optimization index.
Description
Technical Field
The invention belongs to the technical field of wireless charging of electric automobiles, and particularly relates to a magnetic characteristic parameter-based interoperability testing method for a magnetic transmission component of a wireless charging system of an electric automobile.
Background
In recent years, due to the characteristics of safety, convenience, high automation degree and the like, the wireless charging technology is widely applied to the field of electric automobile charging. The structure and the working process of the wireless charging equipment of the electric automobile are as follows: ground side-the rectifier converts the power frequency AC power into DC power through AC-DC conversion, the inverter inverts the DC power into high frequency AC power through DC-AC conversion, the AC current output from the inverter is passed through a transmitting coil installed on the ground or underground, and a high frequency electromagnetic field is generated in the charging area; the vehicle side-the receiving coil installed on the vehicle chassis receives the high-frequency electromagnetic field of the transmitting coil, generates high-frequency voltage, and then converts the high-frequency voltage into direct current through the rectifying circuit so as to charge the vehicle-mounted battery.
The interoperability of the magnetic transmission component of the wireless charging system of the electric automobile refers to the performance that the transmission power and the transmission efficiency of the system are not reduced when transmitting end (TA, including a transmitting coil and a primary side compensation network) products and receiving end (RA, including a receiving coil and a secondary side compensation network) products of different manufacturers are used mutually. Because the wireless charging equipment has more technical route branches, the wireless charging equipment has great differences in structures and parameters such as power level, transmission distance, coil type and structure, working frequency, compensation network topology and the like. After the wireless charging technology is popularized, the situation of coexistence of multiple manufacturers, multiple products and multiple technical lines inevitably exists. If the interoperability requirements cannot be met among wireless charging equipment of different manufacturers, on one hand, the wireless charging equipment can cause great waste of power resources (low charging efficiency) and even cannot be charged completely; on the other hand, potential safety hazards (authentication and charging errors, protection failures, electromagnetic leakage and the like) and even equipment and personal hazards can be caused. Therefore, ensuring the interoperability of wireless charging devices is one of the key factors in the growth of the industry.
The physical core of the interoperability of the magnetic transmission part of the wireless charging system of the electric automobile is the compatibility between the coil type and the topology of the compensation network. In the aspect of the coil, two kinds of coil structures are generally adopted to the current wireless charging equipment of electric automobile related products: circular coils used by Witricity, USA, and DD-type coils used by Gautong, USA. Compensation of network topology aspects: at present, compensation topologies such as series connection, parallel connection, LCL and LCC are widely applied. When the structures of the transmitting end (coil and compensation network) and the receiving end (coil and compensation network) are different, the wireless charging device may not work normally, and interoperability between products of different manufacturers (compatibility between different types of coils and different compensation network topologies) may not be ensured. Once the wireless charging product for the electric automobile is brought to the market, the interoperability becomes a competitive advantage of the product. In order to meet interoperability and realize interconnection and intercommunication with other products, the interoperability between the product and the existing product needs to be tested by a qualified testing mechanism before the product is put on the market, and the product can enter the market after meeting the standard.
Since interoperability involves cross-performance testing between different products, interoperability testing is inherently different from traditional testing targeting output power, efficiency, electromagnetic compatibility levels, and the like. However, the existing magnetic transmission component interoperability test and passing evaluation method for the wireless charging system of the electric vehicle has serious defects, mainly including:
1. the existing testing method is based on cross testing among products, and the testing workload is large. In order to fully test the interoperability among all products, the power and efficiency of the transmitting end and the receiving end of all products during the interoperability need to be cross-tested. On one hand, the test process puts forward a rigorous requirement on a test mechanism, great workload is brought by traversing all products, and meanwhile, a large part of repeated tests exist, so that the product interoperability is obviously not suitable for judgment; on the other hand, due to the lack of gauge equipment, the source tracing of the test result cannot be carried out, namely the product optimization design cannot be guided;
2. the existing passability evaluation method directly evaluates interoperability through transmission power and efficiency and cannot guide the optimization design of products. On one hand, the cross test can only form a test table for whether the power and the efficiency of the corresponding product meet the standards, and a test set or a reference value area for whether the interoperability is met cannot be provided; on the other hand, the power efficiency can only describe the overall characteristics of the two-port network, and the reason why the product does not meet the interoperability cannot be analyzed and explained, namely, which factors influence the interoperability cannot be given;
3. the existing testing method is based on a power analyzer for testing and has low accuracy. According to the calculation expression of the efficiency of the magnetic transmission component, the efficiency test relates to the effective values of the voltage and the current of the transmitting end and the receiving end and the phase difference of the voltage and the current. On one hand, as the power analyzer tests and uses current and voltage sensors \ modules with different precision grades, the precision of the test equipment may cause serious influence on the final result; on the other hand, the measurement of the high-frequency phase is difficult to be completely accurate at present, and measurement errors are introduced even if a high-precision power analyzer is used.
Disclosure of Invention
The invention provides a magnetic characteristic parameter-based electric vehicle wireless charging system magnetic transmission component interoperability testing method for solving the technical problems in the prior art.
The purpose of the invention is realized by the following technical scheme: the magnetic characterization parameter-based interoperability testing method for the magnetic transmission component of the electric automobile wireless charging system comprises the following steps of:
the method comprises the following steps: determining gauge equipment, wherein parameter design refers to transmitting and receiving coils with different power levels and different air gaps in the international standard of wireless charging of the electric automobile and topological parameters of a compensation network;
step two: calculating and determining a reference value area of the magnetic characteristic parameters of the vehicle side; respectively taking the reference TA and the gauge equipment as a transmitting end and a receiving end; setting reference TA Current value IpKeeping constant, setting the relative position of the reference TA and the gauge device when no offset exists in the XYZ directions, placing the gauge device at the position, and measuring the open-circuit average voltage U of the gauge deviceoc2Converting to obtain corresponding magnetic characteristic parameters, changing the displacement in the XYZ direction, repeating the steps for all the position points, and obtaining a reference value area of the magnetic characteristic parameters on the vehicle side;
step three: testing the product; pairing the product TA with gauge equipment and setting the test product TA current to a constant value IpSetting XYZMeasuring the relative position of the gauge equipment and the product TA when the directions are not deviated, and measuring the open-circuit average voltage U of the gauge equipmentoc2And converting to obtain corresponding magnetic characteristic parameters;
step four: testing whether the output power meets the requirement after power-on, if not, terminating the test and judging that the TA of the product does not meet the interoperability requirement; if the power requirement is met, changing the displacement in the XYZ direction, and repeating the steps for all the position points; all the position point magnetic characteristic parameter test results meet the reference value area, which is a sufficient condition for judging that the product TA meets the interoperability requirement;
step five: and forming a product TA interoperability judgment conclusion according to the test result.
Further, each gauge device is composed of N mutually independent winding nests, and the number of turns of each winding is N2。
Further, measuring the open-circuit voltage U of the secondary gauge equipmenti2Calculating according to the formula (1) to obtain the average open-circuit voltage Uoc2Changing the position of the coil to obtain a test result;
in the formula, n is the winding number of a single gauge device;
calculating according to a formula (2) to obtain corresponding magnetic characteristic parameters, and forming a magnetic characteristic parameter standard area;
in the formula N2Indicating the gauge equipment coil turns and omega the operating angular frequency.
Drawings
FIG. 1 is a graph of measured open circuit voltage; wherein R is resistance, L2Is a receiving coil inductance;
FIG. 2 is a test chart of product TA;
fig. 3 is a diagram of a single-pole type gauge apparatus;
fig. 4 is a diagram of a bipolar gauge apparatus.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention selects gauge equipment recommended to be used in the existing electric vehicle wireless charging international standards (such as SAE, IEC, ISO and the like) as a secondary side test coil. The method is used for evaluating the magnetic interoperability of the product TA. The test of any product uses the only gauge equipment, has avoided the blind cross test between different products. The evaluation index is the magnetic flux through the gauge apparatus. The test object is the open circuit voltage of the gauge apparatus. And on the premise that the output power reaches the standard, when the magnetic flux of the tested product and the magnetic flux of the gauge equipment meet the reference value area, the TA of the tested product is judged to pass the interoperability judgment, and the interoperability standard is met.
The invention provides an electric automobile wireless charging system magnetic transmission component interoperability testing method based on magnetic characterization parameters, which comprises the following steps:
the method comprises the following steps: determining gauge equipment, wherein parameter design refers to transmitting and receiving coils with different power levels and different air gaps in the international standard of wireless charging of the electric automobile and topological parameters of a compensation network;
step two: calculating and determining a reference value area of a vehicle side magnetic characteristic parameter (namely magnetic flux); respectively taking the reference TA and the gauge equipment as a transmitting end and a receiving end; setting reference TA Current value IpKeeping constant, setting the relative position of the reference TA and the gauge device when no offset exists in the XYZ directions, placing the gauge device at the position, and measuring the open-circuit average voltage U of the gauge deviceoc2Converting to obtain corresponding magnetic flux, changing the displacement in the XYZ direction, repeating the steps for all the position points, and obtaining a vehicle side magnetic flux reference value area;
step three: with reference to fig. 2, the product was tested; pairing the product TA with gauge equipment and setting the test product TA current to a constant value IpSetting the relative position of the gauge equipment and the product TA when no offset exists in the XYZ directions, and measuring the open-circuit average voltage U of the gauge equipmentoc2And converting to obtain corresponding magnetic flux;
step four: testing whether the output power meets the requirement after power-on, if not, terminating the test and judging that the TA of the product does not meet the interoperability requirement; if the power requirement is met, changing the displacement in the XYZ direction, and repeating the steps for all the position points; the condition that the magnetic flux test results of all the position points meet the reference value area is a sufficient condition for judging that the product TA meets the interoperability requirement;
step five: and forming a product TA interoperability judgment conclusion according to the test result.
As the sizes of the coils of the TA equipment produced by manufacturers are different, in order to comprehensively measure the interoperability of the coils, the gauge equipment is designed into various structures such as a single-pole type (figure 3) and a double-pole type (figure 4), each gauge equipment is formed by nesting N mutually independent windings, and the number of turns of each winding is N2。
Measuring secondary side gauge equipment open circuit voltage Ui2Calculating according to the formula (1) to obtain the average open-circuit voltage Uoc2Changing the coil position (XYZ direction) to obtain a test result;
in the formula, n is the winding number of a single gauge device;
calculating according to the formula (2) to obtain corresponding magnetic flux, and forming a magnetic flux standard area;
in the formula N2Indicating the gauge equipment coil turns and omega the operating angular frequency.
As shown in fig. 1, the open-circuit voltage of the secondary winding is tested
Calculated to obtain an average value of
Magnetic flux corresponding to the moment
Where ω is the angular frequency of operation of the system, MTA、MRAIs the primary and secondary side coil mutual inductance coefficient, I1、I2Is the primary and secondary side coil current, N1、N2The number of primary and secondary turns is shown as β, which is a correction value and is supplied by the manufacturer.
According to the formula, when the magnetic flux of the tested product and the magnetic flux of the gauge equipment meet the standard magnetic flux value area, the TA of the product passes the interoperability test, and otherwise, the TA of the product does not have the interoperability.
Compared with the prior art, the invention has the following beneficial results:
1. compared with the existing test method based on the cross test among the products, the test method for the interoperability of the magnetic transmission component of the wireless charging system of the electric automobile based on the magnetic characteristic parameters introduces the reference TA, converts repeated cross traversal tests among the products into tests between the product TA and gauge equipment, and greatly reduces the test workload.
2. The method provided by the invention introduces gauge equipment, and solves the problems that the existing testing method is lack of gauge equipment and testing standards and is difficult to popularize to a testing mechanism. Further, the product will target gauge equipment to optimize interoperability designs, which may guide product development.
3. According to the method provided by the invention, only the open-circuit voltage of the gauge equipment needs to be measured when the product TA is tested, two groups of data of the transmitting end and the receiving end need to be measured in the traditional method, and the method reduces the influence of the uncertainty of measurement on the final result, thereby improving the test accuracy.
4. The method provided by the invention has strong visualization degree, and the interoperability test result can be visually given in a magnetic flux diagram mode. The traditional test method can only obtain the conclusion whether the interoperability is provided, and the reason cannot be explained in detail.
The magnetic characteristic parameter-based electric vehicle wireless charging system magnetic transmission component interoperability test method provided by the invention is described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (3)
1. The magnetic characteristic parameter-based interoperability testing method for the magnetic transmission component of the wireless charging system of the electric automobile is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: determining gauge equipment, wherein parameter design refers to transmitting and receiving coils with different power levels and different air gaps in the international standard of wireless charging of the electric automobile and topological parameters of a compensation network;
step two: calculating and determining a reference value area of the magnetic characteristic parameters of the vehicle side; respectively taking the reference TA and the gauge equipment as a transmitting end and a receiving end; setting reference TA Current value IpKeeping constant, setting the relative position of the reference TA and the gauge device when no offset exists in the XYZ directions, placing the gauge device at the position, and measuring the open-circuit average voltage U of the gauge deviceoc2Converting to obtain corresponding magnetic characteristic parameters, changing the displacement in the XYZ direction, repeating the steps for all the position points, and obtaining a reference value area of the magnetic characteristic parameters on the vehicle side;
step three: testing the product; pairing the product TA with gauge equipment and setting the test product TA current to a constant value IpSetting the relative position of the gauge equipment and the product TA when no offset exists in the XYZ directions, and measuring the open-circuit average voltage U of the gauge equipmentoc2And converting to obtain corresponding magnetic characteristic parameters;
step four: testing whether the output power meets the requirement after power-on, if not, terminating the test and judging that the TA of the product does not meet the interoperability requirement; if the power requirement is met, changing the displacement in the XYZ direction, and repeating the steps for all the position points; all the position point magnetic characteristic parameter test results meet the reference value area, which is a sufficient condition for judging that the product TA meets the interoperability requirement;
step five: and forming a product TA interoperability judgment conclusion according to the test result.
2. The method of claim 1, wherein: each gauge device is composed of N mutually independent winding nests, and the number of turns of each winding is N2。
3. The method of claim 2, wherein: measuring secondary side gauge equipment open circuit voltage Ui2Calculating according to the formula (1) to obtain the average open-circuit voltage Uoc2Changing the position of the coil to obtain a test result;
in the formula, n is the winding number of a single gauge device;
calculating according to a formula (2) to obtain corresponding magnetic characteristic parameters, and forming a magnetic characteristic parameter standard area;
in the formula N2Indicating the gauge equipment coil turns and omega the operating angular frequency.
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| CN114487667A (en) * | 2022-01-18 | 2022-05-13 | 中国矿业大学 | Electric automobile wireless charging interoperability test system and method |
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