Automatic testing device and method for magnetically coupled wireless power transmission system

Abstract

The present invention discloses an automatic testing device and method for a magnetically coupled wireless power transmission system. The device includes an information transmission module, a first power collection module, a second power collection module, a DC power supply, an inverter, a multi-degree-of-freedom turntable, a transmitting coil, a receiving coil, a third power collection module, a fourth power collection module, a rectifier circuit, a load, and an information receiving module. The first power collection module is connected to the direct power supply and the inverter, respectively. The inverter is connected to the second power collection module, which is connected to the multi-degree-of-freedom turntable. The multi-degree-of-freedom turntable is connected to the third power collection module, which is connected to the rectifier circuit, which is connected to the fourth power collection module, which is connected to the load. The multi-degree-of-freedom turntable can enable axial movement, radial movement, and angular rotation of the receiving coil relative to the transmitting coil. The present invention can automatically test the system transmission efficiency when the receiving coil is in different positions.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to an automatic testing device and method for a magnetically coupled wireless power transmission system. Background Art

[0002] With the advancement of the times, power equipment is also developing rapidly, and power equipment is being applied in a wide variety of complex practical scenarios. Traditional wired power transmission suffers from the problem of sparks caused by the damage and aging of transmission lines, which seriously shortens the lifespan of electrical equipment and even threatens people's personal safety. It can no longer meet people's demand for a high quality of life. Magnetic coupling resonant transmission technology, with its moderate transmission power, high efficiency, and moderate distance, has important research value and application significance.

[0003] Although wireless power transmission has many advantages, the efficiency of wireless power transmission systems has always been a concern for the public. The efficiency of wireless power transmission systems includes inverter efficiency, efficiency between coils, and rectifier efficiency. The different positions between coils (axial distance d, radial offset h, angular offset) are one of the important factors affecting efficiency. Therefore, testing inverter efficiency, efficiency between coils, and rectifier efficiency is of great significance. Summary of the Invention

[0004] To address the problem of automated testing of inverter efficiency, inter-coil efficiency, and rectifier efficiency in existing wireless power transmission systems, the present invention discloses an automatic testing device for a magnetically coupled wireless power transmission system. The testing device includes an information transmission module, a first power collection module, a second power collection module, a DC power supply, an inverter, a multi-degree-of-freedom turntable, a transmitting coil, a receiving coil, a third power collection module, a fourth power collection module, a rectifier circuit, a load, and an information receiving module. The DC power supply is connected to the first power collection module, which is connected to the inverter, which is connected to the second power collection module, which is connected to the multi-degree-of-freedom turntable, which is connected to the third power collection module, which is connected to the rectifier circuit, which is connected to the fourth power collection module, which is connected to the load. The transmitting coil and the receiving coil are mounted on the multi-degree-of-freedom turntable, the first and second power collection modules are connected to the information transmission module, and the third and fourth power collection modules are connected to the information receiving module. The multi-degree-of-freedom turntable is configured to enable the receiving coil to perform axial movement, radial movement, and / or angular rotation relative to the transmitting coil. The DC power supply is used to provide a DC output for the inverter. The inverter is used to convert DC into AC. The rectifier circuit is used to convert AC into DC. The transmitting coil is used to send wireless energy into free space. The receiving coil is used to receive the wireless energy sent by the transmitting coil.

[0005] The first power acquisition module acquires the real-time input voltage and current values of the inverter, and calculates the real-time input power P1 of the inverter based on the acquired voltage and current values; the second power acquisition module acquires the real-time output voltage and current values of the inverter, and calculates the real-time output power P2 of the inverter based on the acquired voltage and current values; the third power acquisition module acquires the real-time input voltage and current values of the rectifier, and calculates the real-time input power P3 of the rectifier based on the acquired voltage and current values; the fourth power acquisition module acquires the real-time output voltage and current values of the rectifier, and calculates the real-time output power P4 of the rectifier based on the acquired voltage and current values.

[0006] The multi-degree-of-freedom turntable can make the transmitting coil and the receiving coil move in the set direction. The inner diameter of the transmitting coil is r1, and the inner diameter of the receiving coil is r2. The multi-degree-of-freedom turntable makes the axial movement of the receiving coil relative to the transmitting coil d, the radial movement of the receiving coil relative to the transmitting coil h, and the angular rotation of the receiving coil relative to the transmitting coil

[0007] The first power acquisition module transmits the inverter input power P1 to the information sending module, the second power acquisition module transmits the inverter output power P2 to the information sending module, the third power acquisition module transmits the rectifier input power P3 to the information receiving module, and the fourth power acquisition module transmits the rectifier output power P4 to the information receiving module. The information sending module sends the inverter input power P1 and output power P2 to the information receiving module. The information receiving module calculates the inverter efficiency to be The coil transmission efficiency is calculated to be The efficiency of the rectifier circuit is calculated to be The overall efficiency of the magnetically coupled wireless power transmission system is calculated using the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency.

[0008] The present invention discloses a method for automatically testing a magnetic coupling wireless power transmission system by using the automatic testing device for the magnetic coupling wireless power transmission system. The first power acquisition module transmits the inverter input power P1 to the information sending module, the second power acquisition module transmits the inverter output power P2 to the information sending module, the third power acquisition module transmits the rectifier input power P3 to the information receiving module, the fourth power acquisition module transmits the rectifier output power P4 to the information receiving module, the information sending module transmits the inverter input power P1 and output power P2 to the information receiving module, and the information receiving module calculates the inverter efficiency to be The coil transmission efficiency is calculated to be The efficiency of the rectifier circuit is calculated to be The overall efficiency of the magnetically coupled wireless power transmission system is calculated using the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency.

[0009] Specifically, to calculate the overall efficiency of the magnetically coupled wireless power transmission system, the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency calculated over a period of time are used to construct an efficiency matrix. The efficiency matrix is subjected to singular value decomposition to obtain its non-zero singular values. The non-zero singular values are used as weights to perform a weighted sum calculation on the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment to obtain the overall efficiency of the magnetically coupled wireless power transmission system at the corresponding moment.

[0010] Specifically, within a period of time, at a certain time interval, the information receiving module calculates the vectors composed of the time discrete values of the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency, respectively, which are [η 1,1 ,η 1,2 ,…,η 1,N ]、[η 2,1 ,η 2,2 ,…,η 2,N ]、[η 3,1 ,η 3,2 ,…,η 3,N ], and express it in vector form, we get Y1=[η 1,1 ,η 1,2 ,…,η 1,N ],Y2=[η 2,1 ,η 2,2 ,…,η 2,N ],Y3=[η 3,1 ,η 3,2 ,…,η 3,N ], N is the number of various efficiency values calculated within a period of time, and the efficiency matrix X = [Y1; Y2; Y3] is constructed. The efficiency matrix is subjected to singular value decomposition to obtain

[0011] X=UΣV T ,

[0012] Among them, U is the left multiplication matrix, V is the right multiplication matrix, Σ is the singular value matrix, and its expression is:

[0013]

[0014] Among them, the singular value diagonal matrix Σ1=diag(σ1,σ2,σ3), with the singular values σ1,σ2,σ3 as weights, the calculated values of the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment are weighted summed to obtain the overall efficiency value of the magnetic coupling wireless power transmission system at the corresponding moment, that is:

[0015] zηi =σ1η 1,i +σ2η 2,i +σ3η 3,i ,

[0016] Among them, zη i It represents the overall efficiency value of the magnetically coupled wireless power transmission system at the i-th moment, and i represents the sequence number of the efficiency value calculation moment.

[0017] Specifically, during the automatic testing of the magnetically coupled wireless power transmission system, a multi-degree-of-freedom turntable is used to move the transmitting coil and the receiving coil in a set direction, and the moment when the power acquisition module collects power information and the relative position information of the receiving coil relative to the transmitting coil are recorded. The overall efficiency of the magnetically coupled wireless power transmission system over a period of time and the relative position information of the receiving coil relative to the transmitting coil at the corresponding moment are used to fit the two types of variables using a function fitting method to obtain a fitting function. The parameters of the fitting function are used to determine whether the working status of the magnetically coupled wireless power transmission system is normal.

[0018] Specifically, the parameters of the fitting function are used to determine whether the working state of the magnetic coupling wireless power transmission system is normal. The parameters of the fitting function are used as vectors, and the parameters of the transmission function of the set magnetic coupling wireless power transmission system are used as standard vectors. The norm of the difference between the two vectors is calculated. When the norm value exceeds a certain threshold, it is determined that the working state of the magnetic coupling wireless power transmission system is abnormal. The vector norms used are L0 norm, L1 norm, L2 norm, L ∞ Norm or L p One or a combination of norms.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention discloses an automatic testing method for a magnetically coupled wireless power transmission system, which uses a multi-degree-of-freedom turntable to automatically realize the axial movement d, radial movement h, and angular offset of the receiving coil relative to the transmitting coil.

[0021] 2. The control circuit of the present invention is simple and has low loss, and its cost is low. It can test the efficiency of the inverter and the rectifier. When the receiving coil and the transmitting coil are in different positions, the efficiency between the coils and the overall transmission efficiency of the system can be calculated in real time, and the working status of the magnetically coupled wireless power transmission system can be judged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of the automatic testing system for the magnetic coupling wireless power transmission system of the present invention;

[0023] Figure 2This is a coil position diagram of the transmitting coil and the receiving coil in the magnetically coupled multi-degree-of-freedom turntable of the present invention. DETAILED DESCRIPTION

[0024] In order to better understand the content of the present invention, an embodiment is given here.

[0025] Figure 1 This is a structural diagram of the automatic testing system for the magnetic coupling wireless power transmission system of the present invention;

[0026] Figure 2 This is a coil position diagram of the transmitting coil and the receiving coil in the magnetically coupled multi-degree-of-freedom turntable of the present invention.

[0027] Example 1:

[0028] The present invention discloses an automatic testing device for a magnetically coupled wireless power transmission system. The testing device includes an information transmission module, a first power collection module, a second power collection module, a direct current power supply, an inverter, a multi-degree-of-freedom turntable, a transmitting coil, a receiving coil, a third power collection module, a fourth power collection module, a rectifier circuit, a load, and an information receiving module. The direct current power supply is connected to the first power collection module, which is connected to the inverter, which is connected to the second power collection module, which is connected to the multi-degree-of-freedom turntable, which is connected to the third power collection module, which is connected to the rectifier circuit, which is connected to the fourth power collection module, which is connected to the load. The transmitting coil and the receiving coil are mounted on the multi-degree-of-freedom turntable, the first and second power collection modules are connected to the information transmission module, and the third and fourth power collection modules are connected to the information receiving module. The multi-degree-of-freedom turntable is used to enable the receiving coil to perform axial movement, radial movement, and / or angular rotation relative to the transmitting coil. The DC power supply provides a DC output to the inverter. The inverter converts DC to AC. The rectifier converts AC to DC. The transmitting coil transmits wireless power into free space, and the receiving coil receives the wireless power sent by the transmitting coil. The load is the electrical device.

[0029] The first power acquisition module acquires the real-time input voltage and current values of the inverter, and calculates the real-time input power P1 of the inverter based on the acquired voltage and current values; the second power acquisition module acquires the real-time output voltage and current values of the inverter, and calculates the real-time output power P2 of the inverter based on the acquired voltage and current values; the third power acquisition module acquires the real-time input voltage and current values of the rectifier, and calculates the real-time input power P3 of the rectifier based on the acquired voltage and current values; the fourth power acquisition module acquires the real-time output voltage and current values of the rectifier, and calculates the real-time output power P4 of the rectifier based on the acquired voltage and current values.

[0030] The multi-degree-of-freedom turntable can make the transmitting coil and the receiving coil move in the set direction. The inner diameter of the transmitting coil is r1, and the inner diameter of the receiving coil is r2. The multi-degree-of-freedom turntable makes the axial movement of the receiving coil relative to the transmitting coil d, the radial movement of the receiving coil relative to the transmitting coil h, and the angular rotation of the receiving coil relative to the transmitting coil

[0031] The first power acquisition module transmits the inverter input power P1 to the information sending module, the second power acquisition module transmits the inverter output power P2 to the information sending module, the third power acquisition module transmits the rectifier input power P3 to the information receiving module, and the fourth power acquisition module transmits the rectifier output power P4 to the information receiving module. The information sending module sends the inverter input power P1 and output power P2 to the information receiving module. The information receiving module calculates the inverter efficiency to be The coil transmission efficiency is calculated to be The efficiency of the rectifier circuit is calculated to be The overall efficiency of the magnetically coupled wireless power transmission system is calculated using the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency.

[0032] The present invention discloses a method for automatically testing a magnetic coupling wireless power transmission system by using the automatic testing device for the magnetic coupling wireless power transmission system. The first power acquisition module transmits the inverter input power P1 to the information sending module, the second power acquisition module transmits the inverter output power P2 to the information sending module, the third power acquisition module transmits the rectifier input power P3 to the information receiving module, the fourth power acquisition module transmits the rectifier output power P4 to the information receiving module, the information sending module transmits the inverter input power P1 and output power P2 to the information receiving module, and the information receiving module calculates the inverter efficiency to be The coil transmission efficiency is calculated to be The efficiency of the rectifier circuit is calculated to be The overall efficiency of the magnetically coupled wireless power transmission system is calculated using the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency.

[0033] Specifically, to calculate the overall efficiency of the magnetically coupled wireless power transmission system, the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency calculated over a period of time are used to construct an efficiency matrix. The efficiency matrix is subjected to singular value decomposition to obtain its non-zero singular values. The non-zero singular values are used as weights to perform a weighted sum calculation on the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment to obtain the overall efficiency of the magnetically coupled wireless power transmission system at the corresponding moment.

[0034] Specifically, within a period of time, at a certain time interval, the information receiving module calculates the vectors composed of the time discrete values of the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency, respectively, which are [η 1,1 ,η 1,2 ,…,η 1,N ]、[η 2,1 ,η 2,2 ,…,η 2,N ]、[η 3,1 ,η 3,2 ,…,η 3,N ], and express it in vector form, we get Y1=[η 1,1 ,η 1,2 ,…,η 1,N ],Y2=[η 2,1 ,η 2,2 ,…,η 2,N ],Y3=[η 3,1 ,η 3,2 ,…,η 3,N ], N is the number of various efficiency values calculated within a period of time, and the efficiency matrix X = [Y1; Y2; Y3] is constructed. The efficiency matrix is subjected to singular value decomposition to obtain

[0035] X=UΣV T ,

[0036] Among them, U is the left multiplication matrix, V is the right multiplication matrix, Σ is the singular value matrix, and its expression is:

[0037]

[0038] Among them, the singular value diagonal matrix Σ1=diag(σ1,σ2,σ3), with the singular values σ1,σ2,σ3 as weights, the calculated values of the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment are weighted summed to obtain the overall efficiency value of the magnetic coupling wireless power transmission system at the corresponding moment, that is:

[0039] zη i =σ1η 1,i +σ2η 2,i +σ3η 3,i ,

[0040] Among them, zη i It represents the overall efficiency value of the magnetically coupled wireless power transmission system at the i-th moment, and i represents the sequence number of the efficiency value calculation moment.

[0041] Specifically, during the automatic testing of the magnetically coupled wireless power transmission system, a multi-degree-of-freedom turntable is used to move the transmitting coil and the receiving coil in a set direction, and the moment when the power acquisition module collects power information and the relative position information of the receiving coil relative to the transmitting coil are recorded. The overall efficiency of the magnetically coupled wireless power transmission system over a period of time and the relative position information of the receiving coil relative to the transmitting coil at the corresponding moment are used to fit the two types of variables using a function fitting method to obtain a fitting function. The parameters of the fitting function are used to determine whether the working status of the magnetically coupled wireless power transmission system is normal.

[0042] Specifically, the parameters of the fitting function are used to determine whether the working state of the magnetic coupling wireless power transmission system is normal. The parameters of the fitting function are used as vectors, and the parameters of the transmission function of the set magnetic coupling wireless power transmission system are used as standard vectors. The norm of the difference between the two vectors is calculated. When the norm value exceeds a certain threshold, it is determined that the working state of the magnetic coupling wireless power transmission system is abnormal. The vector norms used are L0 norm, L1 norm, L2 norm, L ∞ Norm or L p One or a combination of norms.

[0043] When the receiving coil is in a different position from the transmitting coil, the inverter efficiency, rectifier efficiency, coil transmission efficiency, and the overall transmission efficiency of the system can be calculated in real time.

[0044] Example 2:

[0045] The present invention discloses an automatic testing device for a magnetically coupled wireless power transmission system. The testing device includes an information transmission module, a first power collection module, a second power collection module, a direct current power supply, an inverter, a multi-degree-of-freedom turntable, a transmitting coil, a receiving coil, a third power collection module, a fourth power collection module, a rectifier circuit, a load, and an information receiving module. The direct current power supply is connected to the first power collection module, which is connected to the inverter, which is connected to the second power collection module, which is connected to the multi-degree-of-freedom turntable, which is connected to the third power collection module, which is connected to the rectifier circuit, which is connected to the fourth power collection module, which is connected to the load. The transmitting coil and the receiving coil are mounted on the multi-degree-of-freedom turntable, the first and second power collection modules are connected to the information transmission module, and the third and fourth power collection modules are connected to the information receiving module. The multi-degree-of-freedom turntable is used to enable the receiving coil to perform axial movement, radial movement, and / or angular rotation relative to the transmitting coil. The DC power supply is used to provide a DC output for the inverter. The inverter is used to convert DC into AC. The rectifier circuit is used to convert AC into DC. The transmitting coil is used to send wireless energy into free space. The receiving coil is used to receive the wireless energy sent by the transmitting coil.

[0046] The first power acquisition module acquires the real-time input voltage and current values of the inverter, and calculates the real-time input power P1 of the inverter based on the acquired voltage and current values; the second power acquisition module acquires the real-time output voltage and current values of the inverter, and calculates the real-time output power P2 of the inverter based on the acquired voltage and current values; the third power acquisition module acquires the real-time input voltage and current values of the rectifier, and calculates the real-time input power P3 of the rectifier based on the acquired voltage and current values; the fourth power acquisition module acquires the real-time output voltage and current values of the rectifier, and calculates the real-time output power P4 of the rectifier based on the acquired voltage and current values.

[0047] The multi-degree-of-freedom turntable can make the transmitting coil and the receiving coil move in the set direction. The inner diameter of the transmitting coil is r1, and the inner diameter of the receiving coil is r2. The multi-degree-of-freedom turntable makes the axial movement of the receiving coil relative to the transmitting coil d, the radial movement of the receiving coil relative to the transmitting coil h, and the angular rotation of the receiving coil relative to the transmitting coil

[0048] The first power acquisition module transmits the inverter input power P1 to the information sending module, the second power acquisition module transmits the inverter output power P2 to the information sending module, the third power acquisition module transmits the rectifier input power P3 to the information receiving module, and the fourth power acquisition module transmits the rectifier output power P4 to the information receiving module. The information sending module sends the inverter input power P1 and output power P2 to the information receiving module. The information receiving module calculates the inverter efficiency to be The coil transmission efficiency is calculated to be The efficiency of the rectifier circuit is calculated to be The overall efficiency of the magnetically coupled wireless power transmission system is calculated using the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency.

[0049] The present invention discloses a method for automatically testing a magnetic coupling wireless power transmission system by using the automatic testing device for the magnetic coupling wireless power transmission system. The first power acquisition module transmits the inverter input power P1 to the information sending module, the second power acquisition module transmits the inverter output power P2 to the information sending module, the third power acquisition module transmits the rectifier input power P3 to the information receiving module, the fourth power acquisition module transmits the rectifier output power P4 to the information receiving module, the information sending module transmits the inverter input power P1 and output power P2 to the information receiving module, and the information receiving module calculates the inverter efficiency to be The coil transmission efficiency is calculated to be The efficiency of the rectifier circuit is calculated to be The overall efficiency of the magnetically coupled wireless power transmission system is calculated using the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency.

[0050] Specifically, to calculate the overall efficiency of the magnetically coupled wireless power transmission system, the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency calculated over a period of time are used to construct an efficiency matrix. The efficiency matrix is subjected to singular value decomposition to obtain its non-zero singular values. The non-zero singular values are used as weights to perform a weighted sum calculation on the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment to obtain the overall efficiency of the magnetically coupled wireless power transmission system at the corresponding moment.

[0051] Specifically, within a period of time, at a certain time interval, the information receiving module calculates the vectors composed of the time discrete values of the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency, respectively, which are [η 1,1 ,η 1,2 ,…,η 1,N ]、[η 2,1 ,η 2,2 ,…,η 2,N ]、[η 3,1 ,η3,2 ,…,η 3,N ], and express it in vector form, we get Y1=[η 1,1 ,η 1,2 ,…,η 1,N ],Y2=[η 2,1 ,η 2,2 ,…,η 2,N ],Y3=[η 3,1 ,η 3,2 ,…,η 3,N ], N is the number of various efficiency values calculated within a period of time, and the efficiency matrix X = [Y1; Y2; Y3] is constructed. The efficiency matrix is subjected to singular value decomposition to obtain

[0052] X=UΣV T ,

[0053] Among them, U is the left multiplication matrix, V is the right multiplication matrix, Σ is the singular value matrix, and its expression is:

[0054]

[0055] Among them, the singular value diagonal matrix Σ1=diag(σ1,σ2,σ3), with the singular values σ1,σ2,σ3 as weights, performs logarithmic weighted summation on the calculated values of inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment, and obtains the overall efficiency value of the magnetic coupling wireless power transmission system at the corresponding moment, that is:

[0056] zη i =|log(σ1 / σ0)|η 1,i +|log(σ2 / σ0)σ2η 2,i +log(σ3 / σ0)|σ3η 3,i ,

[0057] Among them, zη i represents the overall efficiency value of the magnetically coupled wireless power transmission system at the i-th moment, i represents the sequence number of the efficiency value calculation moment, σ0=σ1+σ2+σ3.

[0058] Specifically, during the automatic testing of the magnetically coupled wireless power transmission system, a multi-degree-of-freedom turntable is used to move the transmitting coil and the receiving coil in a set direction, and the moment when the power acquisition module collects power information and the relative position information of the receiving coil relative to the transmitting coil are recorded. The overall efficiency of the magnetically coupled wireless power transmission system over a period of time and the relative position information of the receiving coil relative to the transmitting coil at the corresponding moment are used to fit the two types of variables using a function fitting method to obtain a fitting function. The parameters of the fitting function are used to determine whether the working status of the magnetically coupled wireless power transmission system is normal.

[0059] Specifically, the parameters of the fitting function are used to determine whether the working state of the magnetic coupling wireless power transmission system is normal. The parameters of the fitting function are used as vectors, and the parameters of the transmission function of the set magnetic coupling wireless power transmission system are used as standard vectors. The norm of the difference between the two vectors is calculated. When the norm value exceeds a certain threshold, it is determined that the working state of the magnetic coupling wireless power transmission system is abnormal. The vector norms used are L0 norm, L1 norm, L2 norm, L ∞ Norm or L p One or a combination of norms.

[0060] Example 3:

[0061] like Figure 1 As shown, the present invention discloses an automatic testing method for a magnetically coupled wireless power transmission system. The testing platform includes an information sending module, a power collection module 1, a power collection module 2, a DC power supply, an inverter, a multi-degree-of-freedom turntable, a transmitting coil, a receiving coil, a power collection module 3, a power collection module 4, a rectifier circuit, a load, and an information receiving module. The direct power supply is connected to the power collection module 1, which is connected to the inverter, which is connected to the power collection module 2, which is connected to the multi-degree-of-freedom turntable, which is connected to the power collection module 3, which is connected to the rectifier circuit, which is connected to the power collection module 4, which is connected to the load. The multi-degree-of-freedom turntable is equipped with a transmitting coil and a receiving coil. The power collection modules 1 and 2 are connected to the information sending module, and the power collection modules 3 and 4 are connected to the information receiving module. The multi-degree-of-freedom turntable can enable the receiving coil to move axially, radially, and angularly relative to the transmitting coil.

[0062] The power acquisition module 1 acquires the real-time input voltage and current values of the inverter, and calculates the real-time inverter input power P1 based on the acquired voltage and current values; the power acquisition module 2 acquires the real-time output voltage and current values of the inverter, and calculates the real-time inverter output power P2 based on the acquired voltage and current values; the power acquisition module 3 acquires the real-time input voltage and current values of the rectifier, and calculates the real-time rectifier input power P3 based on the acquired voltage and current values; the power acquisition module 4 acquires the real-time output voltage and current values of the rectifier, and calculates the real-time rectifier output power P4 based on the acquired voltage and current values. The multi-degree-of-freedom turntable is equipped with a transmitting coil and a receiving coil and can make them move automatically. The inner diameter of the transmitting coil is r1, and the inner diameter of the receiving coil is r2. The multi-degree-of-freedom turntable can make the receiving coil move axially d, radially h, and rotate angularly relative to the transmitting coil.

[0063] The inverter input power is P1, the inverter output power is P2, the rectifier input power is P3, and the rectifier output power is P4. The power acquisition module 1 transmits the inverter input power P1 to the information sending module, the power acquisition module 2 transmits the inverter output power P2 to the information sending module, the power acquisition module 3 transmits the rectifier input power P3 to the information receiving module, and the power acquisition module 4 transmits the rectifier output power P4 to the information receiving module. The information sending module transmits the inverter input power P1 and output power P2 to the information receiving module. The information receiving module calculates the current inverter efficiency as follows: The coil transmission efficiency is The rectifier efficiency is Overall efficiency of the system

[0064] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for automatically testing a magnetically coupled wireless power transmission system, characterized in that: The invention is realized by using an automatic test device for a magnetically coupled wireless power transmission system; the automatic test device for a magnetically coupled wireless power transmission system comprises: an information sending module, a first power acquisition module, a second power acquisition module, a DC power supply, an inverter, a multi-degree-of-freedom turntable, a transmitting coil, a receiving coil, a third power acquisition module, a fourth power acquisition module, a rectifier circuit, a load and an information receiving module; the DC power supply is connected to the first power acquisition module, the first power acquisition module is connected to the inverter, the inverter is connected to the second power acquisition module, the second power acquisition module is connected to the multi-degree-of-freedom turntable, the multi-degree-of-freedom turntable is connected to the third power acquisition module, the third power acquisition module is connected to the rectifier circuit, and the rectifier circuit The first power acquisition module and the second power acquisition module are connected to the information sending module, and the third power acquisition module and the fourth power acquisition module are connected to the information receiving module. The multi-degree-of-freedom turntable is used to make the receiving coil move axially, radially and / or angularly rotate relative to the transmitting coil. The DC power supply is used to provide a DC power output for the inverter, the inverter is used to convert DC power into AC power, the rectifier circuit is used to convert AC power into DC power, the transmitting coil is used to send wireless energy into free space, and the receiving coil is used to receive the wireless energy sent by the transmitting coil. The method comprises: The first power acquisition module transmits the inverter input power P1 to the information sending module, the second power acquisition module transmits the inverter output power P2 to the information sending module, the third power acquisition module transmits the rectifier input power P3 to the information receiving module, and the fourth power acquisition module transmits the rectifier output power P4 to the information receiving module. The information sending module sends the inverter input power P1 and output power P2 to the information receiving module. The information receiving module calculates the inverter efficiency to be The coil transmission efficiency is calculated to be The efficiency of the rectifier circuit is calculated to be The overall efficiency of the magnetically coupled wireless power transmission system is calculated using the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency. To calculate the overall efficiency of the magnetically coupled wireless power transmission system, an efficiency matrix is constructed using the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency calculated over a period of time. Singular value decomposition is performed on the efficiency matrix to obtain its non-zero singular values. These non-zero singular values are used as weights to perform a weighted sum calculation on the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment to obtain the overall efficiency of the magnetically coupled wireless power transmission system at the corresponding moment.

2. The method for automatically testing a magnetically coupled wireless power transmission system according to claim 1, wherein: In a period of time, at a certain time interval, the information receiving module calculates the time discrete values of the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency respectively, which are [η 1,1 ,η 1,2 ,…,η 1,N ]、[η 2,1 ,η 2,2 ,…,η 2,N ]、[η 3,1 ,η 3,2 ,…,η 3,N ], and express it in vector form, we get Y1=[η 1,1 ,η 1,2 ,…,η 1,N ],Y2=[η 2,1 ,η 2,2 ,…,η 2,N ],Y3=[η 3,1 ,η 3,2 ,…,η 3,N ], N is the number of various efficiency values calculated within a period of time, and the efficiency matrix X = [Y1; Y2; Y3] is constructed. The efficiency matrix is subjected to singular value decomposition to obtain X=UΣV T , Among them, U is the left multiplication matrix, V is the right multiplication matrix, Σ is the singular value matrix, and its expression is: Among them, the singular value diagonal matrix Σ1=diag(σ1,σ2,σ3), with the singular values σ1,σ2,σ3 as weights, the calculated values of the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment are weighted summed to obtain the overall efficiency value of the magnetic coupling wireless power transmission system at the corresponding moment, that is: zη i =σ1η 1,i +s2h 2,i +s3h 3,i , Among them, zη i It represents the overall efficiency value of the magnetically coupled wireless power transmission system at the i-th moment, and i represents the sequence number of the efficiency value calculation moment.

3. The method for automatically testing a magnetically coupled wireless power transmission system according to claim 1, wherein: In a period of time, at a certain time interval, the information receiving module calculates the time discrete values of the inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency respectively, which are [η 1,1 ,η 1,2 ,…,η 1,N ]、[η 2,1 ,η 2,2 ,…,η 2,N ]、[η 3,1 ,η 3,2 ,…,η 3,N ], and express it in vector form, we get Y1=[η 1,1 ,η 1,2 ,…,η 1,N ],Y2=[η 2,1 ,η 2,2 ,…,η 2,N ],Y3=[η 3,1 ,η 3,2 ,…,η 3,N ], N is the number of various efficiency values calculated within a period of time, and the efficiency matrix X = [Y1; Y2; Y3] is constructed. The efficiency matrix is subjected to singular value decomposition to obtain X=UΣV T , Among them, U is the left multiplication matrix, V is the right multiplication matrix, Σ is the singular value matrix, and its expression is: Among them, the singular value diagonal matrix Σ1=diag(σ1,σ2,σ3), with the singular values σ1,σ2,σ3 as weights, performs logarithmic weighted summation on the calculated values of inverter efficiency, coil transmission efficiency, and rectifier circuit efficiency at each moment, and obtains the overall efficiency value of the magnetic coupling wireless power transmission system at the corresponding moment, that is: zη i =|log(σ1 / σ0)|η 1,i +|log(σ2 / σ0)|σ2η 2,i +|log(σ3 / σ0)|σ3η 3,i , Among them, zη i represents the overall efficiency value of the magnetically coupled wireless power transmission system at the i-th moment, i represents the sequence number of the efficiency value calculation moment, σ0=σ1+σ2+σ3.

4. The method for automatically testing a magnetically coupled wireless power transmission system according to claim 1, wherein: During the automatic testing of the magnetically coupled wireless power transmission system, a multi-degree-of-freedom turntable is used to move the transmitting coil and the receiving coil in a set direction. The moment when the power acquisition module collects power information and the relative position information of the receiving coil relative to the transmitting coil are recorded. The overall efficiency of the magnetically coupled wireless power transmission system over a period of time and the relative position information of the receiving coil relative to the transmitting coil at the corresponding moment are used to fit the two types of variables using a function fitting method to obtain a fitting function. The parameters of the fitting function are used to determine whether the working status of the magnetically coupled wireless power transmission system is normal.

5. The method for automatically testing a magnetically coupled wireless power transmission system according to claim 4, wherein: The parameters of the fitting function are used to determine whether the working state of the magnetic coupling wireless power transmission system is normal. The parameters of the fitting function are used as a vector, and the parameters of the transmission function of the set magnetic coupling wireless power transmission system are used as a standard vector. The norm of the difference between the two vectors is calculated. When the norm value exceeds a certain threshold, it is determined that the working state of the magnetic coupling wireless power transmission system is abnormal.

6. The method for automatically testing a magnetically coupled wireless power transmission system according to claim 1, wherein: The first power acquisition module acquires the real-time input voltage and current values of the inverter, and calculates the real-time input power P1 of the inverter based on the acquired voltage and current values; the second power acquisition module acquires the real-time output voltage and current values of the inverter, and calculates the real-time output power P2 of the inverter based on the acquired voltage and current values; the third power acquisition module acquires the real-time input voltage and current values of the rectifier, and calculates the real-time input power P3 of the rectifier based on the acquired voltage and current values; the fourth power acquisition module acquires the real-time output voltage and current values of the rectifier, and calculates the real-time output power P4 of the rectifier based on the acquired voltage and current values.

7. The method for automatically testing a magnetically coupled wireless power transmission system according to claim 1, wherein: The multi-degree-of-freedom turntable can make the transmitting coil and the receiving coil move in the set direction. The inner diameter of the transmitting coil is r1, and the inner diameter of the receiving coil is r2. The multi-degree-of-freedom turntable makes the axial movement of the receiving coil relative to the transmitting coil d, the radial movement of the receiving coil relative to the transmitting coil h, and the angular rotation of the receiving coil relative to the transmitting coil

Images