CN-121984250-A - Magnetic resonance wireless energy transmission multi-load constant voltage output system and method

CN121984250ACN 121984250 ACN121984250 ACN 121984250ACN-121984250-A

Abstract

The application discloses a magnetic resonance wireless energy transfer multi-load constant voltage output system and a method, which belong to the field of wireless power supply, and adopt an N-level architecture (comprising a transmitting-relaying unit, a receiving-transmitting unit and a relaying-receiving unit, wherein the receiving unit is added when N is even number), and the system combines an S-type compensation topology, a DD/Q and DDQ differential coil structure, and realizes zero phase angle input and multi-load constant voltage output of a transmitting end by equivalent mutual inductance reconstruction and dynamic adjustment and elimination of a compensation capacitor. The novel power supply system has the advantages of compact and flexible structure, effective cross coupling inhibition, high efficiency and stability, capability of replacing wired power supply, capability of solving the problems of difficult wiring and high maintenance cost of the distributed scene such as ultra/extra-high voltage insulator monitoring and the like, and important engineering application value.

Inventors

LIANG GANG
MA CHONG
XIAO HAN
WANG XIN
LI CHUNLONG
HUANG HUI
XIE PENG
LIU JIE
LUO RUIXUE
CAI ZIAN
HOU JIANMING

Assignees

国网新疆电力有限公司信息通信公司
中国电力科学研究院有限公司南京分院

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. A magnetic resonance wireless energy transfer multi-load constant voltage output system consists of an N-level framework and is characterized by comprising a transmitting-relay unit, [ (N-1)/2 ] receiving-transmitting units and [ (N-1)/2 ] relay-receiving units; The system comprises a receiving-transmitting unit, a relay unit, a receiving unit, a relay unit, a system final stage and a load end, wherein the receiving-transmitting unit is positioned at the head end of an N-level architecture and is responsible for transmitting electric energy to the receiving-transmitting unit of the next level in a magnetic resonance mode, the receiving-transmitting unit and the relay-receiving unit are alternately arranged in the middle and bear the functions of energy receiving and re-transmitting, when N is even, the receiving unit is added at the final stage to realize constant voltage output of the load end, when N is odd, the system final stage does not need an additional receiving unit, and energy is directly transmitted to the load end through the relay-receiving unit to realize constant voltage output.
2. The magnetic resonance wireless energy transmission multi-load constant voltage output system of claim 1, wherein the transmitting-relaying unit and the part adjacent to the receiving-transmitting unit form a first type of sub-architecture, the relaying-receiving unit and the part adjacent to the two sides of the receiving-transmitting unit form a second type of sub-architecture, the first type of sub-architecture is connected with the second type of sub-architecture through a circuit, and a complete N-level magnetic resonance wireless energy transmission link is formed between the second type of sub-architecture in series.
3. A magnetic resonance wireless energy transmission multi-load constant voltage output method, which adopts the magnetic resonance wireless energy transmission multi-load constant voltage output system as claimed in claims 1-2, and is characterized by comprising the following steps: S1, initializing an N-level magnetic resonance wireless energy transmission link to measure frequency f, direct current input voltage U in , load resistance R Lb , coil self-inductance L k , actual adjacent coil mutual inductance M k（k+1） and coil internal resistance R k ; S2, based on cross coupling classification in coils, dividing the N-level magnetic resonance wireless energy transmission link into cross coupling between a constant voltage level coil and a constant current level coil, cross coupling between the constant voltage level coils and cross coupling between the constant current level coils; S3, calculating equivalent mutual inductance M' k(k+1) corresponding to the actual adjacent mutual inductance M k(k+1) based on the cross coupling between the constant voltage level coils and the cross coupling between the constant current level coils according to the measured parameters; S4, calculating loop currents I k of coils in the first type of sub-architecture and the second type of sub-architecture respectively; S5, calculating the right induction voltage sum F R_s (k) and the left induction voltage sum F L_s (k) of the coil through the actual adjacent mutual inductance M k(k+1) and the coil loop current I k ; S6, calculating the compensation capacitance C k of each coil connected in series based on the sum F R_s (k) of the right induced voltages and the sum F L_s (k) of the left induced voltages of the coils.
4. A magnetic resonance wireless energy transfer multi-load constant voltage output method as set forth in claim 3, wherein in step S2, in the cross coupling between the constant voltage stage coil and the constant current stage coil, the current phase difference between the constant voltage stage coil and the constant current stage coil is 90 degrees, and the phase difference effectively counteracts the coupling action between the constant voltage stage coil and the constant current stage coil through the mutual inductance M k（k+1） of the actual adjacent coils.
5. The method of claim 3, wherein in step S3, the cross coupling between the constant voltage stage coils and the cross coupling between the constant current stage coils are achieved by adjusting the compensation capacitor C k of the corresponding coil to zero the relevant coupling items in the full impedance matrix, so that the cross coupling is eliminated due to the fact that the coil loop current I k has a phase difference of 0 DEG and-180 DEG, which results in significant induced voltage superposition effect.
6. The method of claim 3, wherein in step S3, the conversion formula of the equivalent mutual inductance M' k(k+1) corresponding to the actual adjacent mutual inductance M k(k+1) is as follows: ;① in equation ①, ω represents the system operating resonant angular frequency, n represents the maximum number of coil steps, j is the imaginary unit, Indicating the loop current through the k-1 th coil; Wherein, the concrete expression of G (k) and J (k) is as follows: ;② in equation ②, G (k) represents the cross-coupling of the kth coil loop with the k+ (1+2a) th coil loop on the right side The sum of the induced voltages generated, J (k) represents the cross-coupling of the kth coil loop with the (1+2a) left-hand kth coil loop The sum of the generated induced voltages is 1-k (1+2a) n and a is a positive integer.
7. The method of claim 3, wherein in step S4, the loop currents I k (k=1, 2, 3) of the first type of sub-architecture are expressed as follows: ;③ in the formula ③ of the present invention, R Leqb represents the equivalent input resistance of the rectifier alternating current side of the load corresponding to the b-th coil; the coil loop currents I k (k=4, 5, 2m+1) of the second class of sub-architecture are expressed as: ;④ In the formula ④ of the present invention, Representing the output voltage on the m-2 th load.
8. The method of claim 7, wherein the expression of the output voltage of the load port corresponding to the first type of sub-architecture is: ;⑤ In the formula ⑤ of the present invention, M represents the number of the load, wherein m is less than or equal to N-1, and m is a positive integer; the output voltage expression of the load port corresponding to the second type of sub-architecture is: ;⑥ In the formula ⑥ of the present invention, And Representing the output voltages on the m-1 st load and the m-th load, respectively.
9. The method of claim 3, wherein in step S5, the sum of right induced voltages F R_s (k) and the sum of left induced voltages FL_s (k) of the coil are expressed as follows: ⑦。
10. The method of claim 3, wherein in step S6, the right induced voltage sum F R_s (k) and the left induced voltage sum F L_s (k) are substituted into the following formula to calculate the compensation capacitance Ck of each coil: ⑧。

Description

Magnetic resonance wireless energy transmission multi-load constant voltage output system and method Technical Field The application relates to the field of wireless power supply, in particular to a magnetic resonance wireless energy transmission multi-load constant voltage output system and method. Background The wireless power transmission technology based on the near field electromagnetic coupling principle is widely applied to the fields of biomedical science, consumer electronics, electric automobiles, intelligent industry and the like due to the characteristics of safety, flexibility, no wire contact and the like. In the condition monitoring scene of porcelain insulators of ultra/extra-high voltage transmission lines, a large number of distributed sensors need to be continuously and stably powered, and the traditional wired power supply has the problems of difficult wiring, high maintenance cost, weak capability of adapting to severe environments and the like, so that the wireless power supply becomes an ideal alternative scheme. In order to break through the limit of near-field coupling transmission distance and meet the requirement of multi-load power supply, the prior art often adopts a multi-relay coil structure or a domino coil topology to expand the transmission distance, but the scheme has the following key limitations: 1. the cross coupling interference is remarkable, in a multi-coil framework, the cross coupling relation between constant voltage level coils and constant current level coils and between coils of the same type is complex, so that the system parameters are extremely sensitive to coupling changes, and the stability of output voltage is poor; 2. The existing multi-load system adopts complex compensation networks such as LCC, LLC and the like, a large number of passive devices are needed, the system volume and cost are increased, and the structure compactness is reduced; 3. When the load changes or cross coupling is interfered, the voltage of each load port is difficult to be kept constant by the existing system, and the requirement of the distributed sensor on the power supply precision cannot be met; 4. The transmission efficiency is low, the energy transmission loss is increased due to cross coupling, the transmission efficiency is obviously reduced due to coupling interference, and the power supply device is difficult to adapt to long-distance and high-reliability power supply scenes. The limitations restrict the large-scale application of the wireless energy transmission technology in the scenes such as distributed monitoring, and therefore, a magnetic resonance wireless energy transmission system which has a simple structure, a compact volume, can effectively eliminate cross coupling interference, realizes multi-load constant-voltage output and has high transmission efficiency is needed. Disclosure of Invention The application provides a multi-load constant voltage output realization method of a multi-stage magnetic resonance wireless energy transmission system, which is characterized in that an equivalent mutual inductance model is introduced to decouple the first cross coupling influence between adjacent coils, a system impedance equation based on equivalent parameters is constructed, and the series compensation capacitance of each stage of coils is dynamically regulated by combining feedback information of a load end, so that the system can maintain a resonance state under different load conditions, and the technical problems of multi-load constant voltage output and zero phase angle input of a transmitting end are solved. In order to achieve the above purpose, the application provides a magnetic resonance wireless energy transfer multi-load constant voltage output system, which consists of an N-level architecture and comprises a transmitting-relay unit, [ (N-1)/2 ] receiving-transmitting units and [ (N-1)/2 ] relay-receiving units; The system comprises a receiving-transmitting unit, a relay unit, a receiving unit, a relay unit, a system final stage and a load end, wherein the receiving-transmitting unit is positioned at the head end of an N-level architecture and is responsible for transmitting electric energy to the receiving-transmitting unit of the next level in a magnetic resonance mode, the receiving-transmitting unit and the relay-receiving unit are alternately arranged in the middle and bear the functions of energy receiving and re-transmitting, when N is even, the receiving unit is added at the final stage to realize constant voltage output of the load end, when N is odd, the system final stage does not need an additional receiving unit, and energy is directly transmitted to the load end through the relay-receiving unit to realize constant voltage output. In an embodiment, the transmitting-relaying unit and the part adjacent to the receiving-transmitting unit form a first type of sub-architecture, the relaying-receiving unit and the part adjacent to the two sides o