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CN106549509B - Magnetic coupling resonant wireless energy transmission device and method - Google Patents

Magnetic coupling resonant wireless energy transmission device and method Download PDF

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CN106549509B
CN106549509B CN201710054143.4A CN201710054143A CN106549509B CN 106549509 B CN106549509 B CN 106549509B CN 201710054143 A CN201710054143 A CN 201710054143A CN 106549509 B CN106549509 B CN 106549509B
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范兴明
贾二炬
张鑫
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Guilin University of Electronic Technology
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Abstract

The invention discloses a magnetic coupling resonant wireless energy transmission device and a magnetic coupling resonant wireless energy transmission method. The transmitting device comprises a high-frequency power supply, an impedance matching network, a detection system and a transmitting coil. The receiving device comprises a receiving coil, a rectifying and filtering circuit, a cascade conversion circuit, a control system and a load. The invention adds a real-time detection and automatic regulation device in a wireless energy transmission system. When the transmission distance and the load change, the transmission performance of the system is detected in real time, free automatic control and adjustment can be realized according to the requirements of people, and the system can realize high-power and high-efficiency transmission. The method has great significance for fully exerting the advantage of long distance in the technology and enhancing the practicability of the technology.

Description

Magnetic coupling resonant wireless energy transmission device and method
Technical Field
The invention relates to the technical field of wireless energy transmission, in particular to a magnetic coupling resonant wireless energy transmission device and method.
Background
At present, the transmission of electric energy is mainly carried out in a wired mode (namely, a cable is used as an electric energy transmission medium), so that loss is easy to occur in the electric energy transmission process, and the transmission efficiency is reduced; the aging of the circuit and the occurrence of phenomena such as point discharge can also affect the service life and safety of the electric equipment; meanwhile, the charging and maintenance are difficult and the flexibility is poor under severe environments such as rain and snow, human body implanted medical appliances, underwater, mine and other operation conditions. Many of the above disadvantages of conventional wired charging can be effectively solved by wireless energy transmission technology. Wireless energy transfer, also known as contactless power transfer, refers to transferring power from the power source side to the load side without any wire connection. Because the wire is omitted, the device has stronger flexibility, higher safety and stability, and better conforms to the future social development trend.
In three common wireless energy transmission technologies, namely an electromagnetic induction type, a magnetic coupling resonant type and a microwave radiation type, the transmission distance of the magnetic coupling resonant type is far longer than that of the electromagnetic induction type; compare in microwave radiation formula, transmission efficiency is higher, can realize well remote high-power, efficient transmission, all shows very big application potential in a great deal of fields such as portable equipment, human implanted medicine, intelligent house and electric automobile, consequently receives people's favor more. However, the magnetic coupling resonant wireless energy transmission technology also has two more critical problems: (1) output power and transmission efficiency are often not compatible; (2) is sensitive to changes in distance and load. When the distance or load varies, the load of the system deviates from the output power optimum load or the transmission efficiency optimum load, and the output power and the transmission efficiency of the system are greatly reduced. Therefore, a real-time detection and automatic adjustment device is added in the wireless energy transmission system, when the transmission distance and the load change, the transmission performance of the system is detected in real time, free automatic control and adjustment can be realized according to the requirements of people, and the system can be ensured to realize high-power and high-efficiency transmission. The method has great significance for fully playing the advantages of long distance in the technology and enhancing the practicability of the technology.
Disclosure of Invention
The invention aims to solve the technical problems that the existing magnetic coupling resonant wireless energy transmission cannot give consideration to both output power and transmission efficiency and is sensitive to distance and load change, and provides a magnetic coupling resonant wireless energy transmission device and method.
In order to solve the problems, the invention is realized by the following technical scheme:
the magnetic coupling resonant wireless energy transmission device comprises a transmitting device and a receiving device. The transmitting device comprises a high-frequency power supply, an impedance matching network, a detection system and a transmitting coil; the detection system comprises a first detection unit, a transmission microcontroller and a wireless transmission module; the output end of the high-frequency power supply is connected with the input end of the transmitting coil through an impedance matching network; the input end of the first detection unit is connected with the output end of the high-frequency power supply, the output end of the first detection unit is connected with the transmitting microcontroller, and the output end of the transmitting microcontroller is connected with the input end of the wireless transmitting module. The receiving device comprises a receiving coil, a rectifying and filtering circuit, a cascade conversion circuit, a control system and a load; the cascade conversion circuit comprises a Boost conversion circuit and a Buck conversion circuit; the control system comprises a second detection unit, a third detection unit, a receiving microcontroller and a wireless receiving module; the output end of the receiving coil is connected with the input end of a Boost conversion circuit through a rectifying and filtering circuit, the output end of the Boost conversion circuit is connected with the input end of a Buck conversion circuit, and the output end of the Buck conversion circuit is connected with a load; the input end of the wireless receiving module is wirelessly connected with the output end of the wireless transmitting module, and the output end of the wireless receiving module is connected with the input end of the receiving microcontroller; the input end of the second detection unit is connected with the output end of the rectification filter circuit, the input end of the third detection unit is connected with the output end of the Boost conversion circuit, and the output ends of the second detection unit and the third detection unit are simultaneously connected with the input end of the receiving microcontroller; the output end of the receiving microcontroller is connected with the control ends of the Boost conversion circuit and the Buck conversion circuit.
Specifically, the first detection unit includes a first voltage detection unit and a first current detection unit. The first voltage detection unit consists of a first voltage sensor, a first voltage signal conditioning circuit and a first voltage A/D conversion circuit; the first voltage sensor is arranged at the output end of the high-frequency power supply, the input end of the first voltage signal conditioning circuit is connected with the output end of the first voltage sensor, the output end of the first voltage signal conditioning circuit is connected with the input end of the first voltage A/D conversion circuit, and the output end of the first voltage A/D conversion circuit is connected with the emission microcontroller. The first current detection unit consists of a first current sensor, a first current signal conditioning circuit and a first current A/D conversion circuit; the first current sensor is arranged at the output end of the high-frequency power supply, the input end of the first current signal conditioning circuit is connected with the output end of the first current sensor, the output end of the first current signal conditioning circuit is connected with the input end of the first current A/D conversion circuit, and the output end of the first current A/D conversion circuit is connected with the emission microcontroller.
Specifically, the second detection unit includes a second voltage detection unit and a second current detection unit. The second voltage detection unit consists of a second voltage sensor, a second voltage signal conditioning circuit and a second voltage A/D conversion circuit; the second voltage sensor is arranged at the output end of the rectifying and filtering circuit, the input end of the second voltage signal conditioning circuit is connected with the output end of the second voltage sensor, the output end of the second voltage signal conditioning circuit is connected with the input end of the second voltage A/D conversion circuit, and the output end of the second voltage A/D conversion circuit is connected with the receiving microcontroller. The second current detection unit consists of a second current sensor, a second current signal conditioning circuit and a second current A/D conversion circuit; the second current sensor is arranged at the output end of the rectifying and filtering circuit, the input end of the second current signal conditioning circuit is connected with the output end of the second current sensor, the output end of the second current signal conditioning circuit is connected with the input end of the second current A/D conversion circuit, and the output end of the second current A/D conversion circuit is connected with the receiving microcontroller.
In particular, the third detection unit is a third voltage detection unit. The third voltage detection unit consists of a third voltage sensor, a third voltage signal conditioning circuit and a third voltage A/D conversion circuit; the third voltage sensor is arranged at the output end of the Boost conversion circuit, the input end of the third voltage signal conditioning circuit is connected with the output end of the third voltage sensor, the output end of the third voltage signal conditioning circuit is connected with the input end of the third voltage A/D conversion circuit, and the output end of the third voltage A/D conversion circuit is connected with the receiving microcontroller.
Particularly, the transmitting microcontroller is a single chip microcomputer, and the receiving microcontroller is a digital signal processor.
In particular, the transmitting coil and the receiving coil have the same structure, and the centers of the two coils are fixed on the same horizontal line.
The magnetic coupling resonant wireless energy transmission method comprises the following steps:
the high-frequency power supply outputs high-frequency alternating current electric energy; high-frequency alternating current electric energy forms conjugate matching through an impedance matching network, the output power of a high-frequency power supply is maximized, and then the electric energy is input to a transmitting coil; the transmitting coil generates resonance and generates an alternating electromagnetic field around the transmitting coil;
the receiving coil resonates to generate an electromagnetic field with the same frequency, an energy receiving channel is formed, coupling resonance energy is obtained, and alternating current with the same frequency is generated; the rectifying and filtering circuit converts the energy received by the receiving coil into stable direct current; the cascade conversion circuit regulates and processes the direct current to obtain voltage or current suitable for load power supply, and the voltage or the current supplies power to the load to realize wireless transmission of electric energy;
when the system runs, a first detection unit of the detection system acquires system input information, namely output voltage and output current of a high-frequency power supply, and sends the system input information into a transmitting microcontroller after signal conditioning and A/D conversion, and the transmitting microcontroller sends the system input information out through a wireless transmitting module; a wireless receiving module of the control system receives system input information sent by a wireless transmitting module and sends the system input information to a receiving microcontroller; meanwhile, a second detection unit of the control system acquires system output information, namely output voltage and output current of the rectification filter circuit, and the system output information is sent to the receiving microcontroller after signal conditioning and A/D conversion; the third detection unit acquires the working voltage of the cascade conversion circuit, namely the output voltage of the Boost conversion circuit, and sends the working voltage to the receiving microcontroller after signal conditioning and A/D conversion;
when the load or the distance of the system changes, a receiving microcontroller of the control system outputs a PWM signal with certain disturbance to adjust the duty ratio of a Boost conversion circuit and the duty ratio of a Buck conversion circuit of a cascade conversion circuit, and the control system determines whether the disturbance direction is correct or not by comparing the duty ratio of the Boost conversion circuit and the duty ratio of the Buck conversion circuit with the power of the system before adjustment; if the disturbance direction is correct, continuing to disturb the output signal according to the original direction for regulation; if the disturbance direction is wrong, disturbance adjustment is carried out according to the reverse direction until the adjustment of the two times before and after ensures that the variation of the efficacy power of the system is controlled within an allowable range, and at the moment, the system works under the condition that the efficacy power reaches the maximum ideal load to realize the tracking of the optimal load.
Compared with the prior art, the invention has the following characteristics:
1. an evaluation index based on an efficacy power is adopted in a control system, a detection unit is arranged at a transmitting end, and the input power of the system is detected; the detection unit is arranged at the receiving end, the output power of the system is detected (the energy loss of the cascade circuit is ignored), the output power and the efficiency of the system are considered, the output power and the transmission efficiency of the system can be freely changed, the system is ensured to have good comprehensive performance, and the defect that only the single and optimal power and efficiency can be ensured in the traditional control is overcome;
2. by adopting the cascade Boost conversion circuit and the Buck conversion circuit, the problems of large volume or low matching precision of the traditional impedance matching network are avoided, the microcontroller is convenient to separately adjust and control, and the controllability of the system and the stability of energy transmission are improved;
3. the wireless power transmission with medium distance is realized based on the electromagnetic coupling resonance technology, and the wireless power transmission device has the advantages of high efficiency and non-radiative energy transmission;
4. the problem of when distance or load change, the output power and the transmission efficiency of control system can not freely be changed to the system according to people's requirement, and output power and transmission efficiency can not compromise is solved.
Drawings
FIG. 1 is an equivalent circuit model of an MCR-WPT system based on a string topology structure.
Fig. 2 is a block diagram of the present invention.
FIG. 3 is a schematic view of a detecting unit according to the present invention.
FIG. 4 is a schematic diagram of a receiving end cascade conversion topology circuit of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.
The MCR-WPT device based on the optimal load tracking of the power factor adopts the control concept of the power factor. This concept is described below in conjunction with fig. 1:
an equivalent circuit model of the MCR-WPT system adopting the series topology structure is shown in figure 1. In the figure, L 1 ,L 2 ,C 1 ,C 2 ,R 1 ,R 2 Equivalent inductance of transmitting coil and receiving coil respectivelyEquivalent capacitance and equivalent resistance. I is 1 ,I 2 Current in the transmitter coil and receiver coil, respectively, M is the mutual inductance between the two coils, D is the distance between the two coils, R L For equivalent load, U S Is a high frequency power supply. The calculation formula of the output power and the transmission efficiency of the system obtained from fig. 1 is formula (1) and formula (2):
Figure BDA0001216741670000041
Figure BDA0001216741670000042
from the expressions (1) and (2), it can be seen that the maximum output power load R exists LP And an optimum transmission efficiency load R The output power and transmission efficiency of the system are respectively maximized, but R LP >R I.e. there is no optimal workload while maximizing the output power and efficiency of the system. Therefore, in the load interval [ R ] ,R LP ]In addition, the transmission performance of the system is transited from the maximum transmission efficiency to the maximum output power, and when the load is closer to R The greater the transmission efficiency of the system; as the load approaches R LP The greater the output power of the system. In order to give consideration to both the output power and the transmission efficiency of the system and realize free conversion of the output power and the transmission efficiency, the invention provides an evaluation index adopting a new efficacy power, which is specifically shown as formula (3):
Figure BDA0001216741670000043
in the formula, n and m are powers of P and eta respectively and are used for representing the weights of the P and eta in a system evaluation process. If n is far larger than m or m =0, it indicates that only the output power of the system is concerned in the system evaluation process; if m is far greater than n or n =0, it indicates that only the transmission efficiency of the system is concerned in the evaluation process; if m = n, it indicates that the output power and transmission of the system are concerned simultaneously in the evaluation processThe input efficiency, the importance of the two is in the same position; if m is slightly larger than n or n is slightly larger than m, the system is slightly biased to the transmission efficiency or the output power of the system when the system is evaluated. The partial derivative with respect to the load is obtained by taking equation (3) to obtain equation (4). In the formula, Z m And (= omega × M), and M and n are not less than 1.
Figure BDA0001216741670000051
From equation (4), it can be seen that there is an optimal power load to maximize equation (3), specifically as shown in equation (5):
Figure BDA0001216741670000052
maximizing the power of the efficiency At maximum output power load R LP And an optimum transmission efficiency load R Within the interval of (a), i.e.: r ∈[R ,R LP ]. Therefore, by reasonably setting the values of m and n according to the formula (5), the optimal load R which enables the power factor to obtain the maximum can be adjusted When the work load of the system is converted to the maximum load value of the efficacy power through a certain conversion device, namely the maximum load of the efficacy power is obtained through dynamic tracking, the output power and the transmission efficiency of the system can be freely controlled according to the will of people, and the high-power and high-efficiency transmission of the system can be ensured.
To load R L Conversion to the power of efficacy to the maximum optimum load R The DC-DC conversion mode can be adopted. In order to realize the impedance conversion of the load in any range from small to large, a cascade connection form of a Boost conversion circuit and a Buck conversion circuit can be adopted. From this, R can be obtained L And R The relationship between them is shown in formula (6). In the formula, D 1 For the duty cycle of the Boost conversion circuit, D 2 Is the duty cycle of the Buck conversion circuit.
Figure BDA0001216741670000053
A magnetic coupling resonant wireless energy transmission device based on maximum power square load tracking, as shown in fig. 2, includes a transmitting device and a receiving device.
The transmitting device comprises a high-frequency power supply, an impedance matching network, a detection system and a transmitting coil. The output end of the high-frequency power supply is connected with the input end of the transmitting coil through the impedance matching network. The detection system comprises a first detection unit, a transmission microcontroller and a wireless transmission module. The input end of the first detection unit is connected with the output end of the high-frequency power supply, the output end of the first detection unit is connected with the transmitting microcontroller, and the output end of the transmitting microcontroller is connected with the input end of the wireless transmitting module.
The receiving device comprises a receiving coil, a rectifying and filtering circuit, a cascade conversion circuit, a control system and a load. The cascade conversion circuit comprises a Boost conversion circuit and a Buck conversion circuit. The output end of the receiving coil is connected with the input end of the Boost conversion circuit through the rectifying and filtering circuit; the output end of the Boost conversion circuit is connected with the input end of the Buck conversion circuit; the output end of the Buck conversion circuit is connected with a load. The control system comprises a second detection unit, a voltage detection unit, a receiving microcontroller and a wireless receiving module. The input end of the wireless receiving module is wirelessly connected with the output end of the wireless transmitting module, and the output end of the wireless receiving module is connected with the input end of the microcontroller. The input end of the second detection unit is connected with the output end of the rectification filter circuit, the input end of the voltage detection unit is connected with the output end of the Boost conversion circuit, and the output ends of the second detection unit and the voltage detection unit are simultaneously connected with the input end of the receiving microcontroller. The output end of the receiving microcontroller is connected with the control ends of the Boost conversion circuit and the Buck conversion circuit.
The first detection unit and the second detection unit have the same structure and each include a voltage detection unit and a current detection unit, as shown in fig. 3. The voltage detection unit consists of a voltage sensor, a voltage signal conditioning circuit and a voltage A/D conversion circuit. The input end of the voltage signal conditioning circuit is connected with the voltage sensor, the output end of the voltage signal conditioning circuit is connected with the input end of the voltage A/D conversion circuit, and the output end of the voltage A/D conversion circuit is connected with the corresponding microcontroller. The current detection unit consists of a current sensor, a current signal conditioning circuit and a current A/D conversion circuit. The input end of the current signal conditioning circuit is connected with the current sensor, the output end of the current signal conditioning circuit is connected with the input end of the current A/D conversion circuit, and the output end of the current A/D conversion circuit is connected with the corresponding microcontroller.
The third detection unit is also composed of a voltage sensor, a voltage signal conditioning circuit and a voltage A/D conversion circuit. The input end of the voltage signal conditioning circuit is connected with the voltage sensor, the output end of the voltage signal conditioning circuit is connected with the input end of the voltage A/D conversion circuit, and the output end of the voltage A/D conversion circuit is connected with the receiving microcontroller.
In the invention, the transmitting microcontroller of the detection system is a single chip microcomputer, and the receiving microcontroller of the control system is a Digital Signal Processor (DSP). The evaluation index adopted by the receiving microcontroller is an efficacy power, and the times m and n in the efficacy power can be freely set according to the requirements of people. The transmitting coil and the receiving coil have the same structure and are wound by copper wires. The centers of the transmitting coil and the receiving coil are on the same horizontal line so as to improve the electric energy transmission efficiency. The load may be a purely resistive load or a load such as a battery or a super capacitor, etc. whose impedance changes under the influence of external conditions.
The invention adds a real-time detection and automatic regulation device in a wireless energy transmission system. When the transmission distance and the load are changed, the transmission performance of the system is detected in real time, free automatic control and adjustment can be realized according to the requirements of people, and the system can be ensured to realize high-power and high-efficiency transmission. The method has great significance for fully playing the advantages of long distance in the technology and enhancing the practicability of the technology.
The working principle of the invention is as follows:
the high-frequency power supply of the transmitting device outputs high-frequency alternating current electric energy, conjugate matching is formed through the impedance matching network, the output power of the high-frequency power supply is maximized, and then the electric energy is input to the transmitting coil. The transmitting coil resonates, generating an alternating electromagnetic field around it. The receiving coil and the transmitting coil have basically the same structural parameters and are also resonated to generate an electromagnetic field with the same frequency, an energy receiving channel is formed to obtain coupling resonant energy, and alternating current with the same frequency is generated in the transmitting coil. The energy received by the receiving coil is converted into stable direct current through the rectifying and filtering circuit, and is regulated and processed by the control system to obtain voltage or current suitable for load power supply, so that the load is powered, and wireless transmission of electric energy is realized.
When the system runs, a detection unit of the detection system respectively acquires input voltage and input current signals of the system through a voltage sensor and a current sensor; the input voltage V of the cascade conversion circuit is acquired by a detection unit of the control system through a voltage sensor and a current sensor respectively in And an input current signal I in The signals are used as output voltage and output current signals of the system, and are transmitted to corresponding microcontrollers after being processed by circuits such as signal conditioning and A/D conversion. The microcontroller of the detection device transmits system input information to the microcontroller of the control system through the wireless transmitting module and the wireless receiving module. And the microcontroller of the control system obtains the transmission efficiency and the efficacy power of the system through information processing according to the preset times of the efficacy power.
When the load or the distance of the system changes, the microcontroller of the control system outputs a PWM signal with certain disturbance to adjust the duty ratio D of the cascade conversion circuit 1 And D 2 And determining whether the disturbance direction is correct or not by comparing with the power of the efficacy of the system before regulation. If the disturbance direction is correct, continuing to disturb the output signal according to the original direction for regulation; if the disturbance direction is wrong, disturbance adjustment is carried out according to the reverse direction until the two previous and subsequent adjustments ensure that the variation of the power of the system is controlled within an allowable range, and at the moment, the system works under the condition that the power of the system reaches the maximum ideal load to realize the tracking of the optimal load. Before the system works, a buffer capacitor C is arranged 2 Buffer voltage V across bf For operating voltage of loadk times (k is slightly larger than 1 to ensure the safety of load work), a microprocessor of the control system outputs a PWM signal to adjust the duty ratio of the Boost conversion circuit and ensure V bf Greater than V in (ii) a The input end of the Buck conversion circuit is provided with a voltage detection unit for detecting V in real time bf Ensuring buffer voltage V in the event of load or distance variations bf Is always greater than the rated working voltage V at two ends of the load out The working effectiveness of the Buck conversion circuit is guaranteed, the output stability of the system is improved, and the specific working principle of the system is shown in figure 4. Through the control and adjustment, the system can realize high-power and high-efficiency transmission when the load or the distance changes. The load of the system can be a pure resistance load or a load with impedance changing under the influence of external conditions, such as a battery or a super capacitor.
The invention adopts a control strategy taking an efficacy power as an evaluation index and combines a Boost conversion circuit and a Buck conversion circuit in a cascade mode to regulate the working load of the system to the ideal load which enables the efficacy power to reach the maximum when the distance or the load changes, can freely change the output power and the transmission efficiency of the system according to the will of people, can ensure that the system has higher output power and higher transmission efficiency, and overcomes the defect that the traditional control strategy can only ensure the output power and the transmission efficiency to be single and optimal. The system has the characteristics of simple structure, easy realization, superior system comprehensive performance and the like.

Claims (7)

1. The magnetic coupling resonant wireless energy transmission method is characterized by comprising the following steps of:
the high-frequency power supply outputs high-frequency alternating current electric energy; high-frequency alternating current electric energy forms conjugate matching through an impedance matching network, the output power of a high-frequency power supply is maximized, and then the electric energy is input to a transmitting coil; the transmitting coil generates resonance and generates an alternating electromagnetic field around the transmitting coil;
the receiving coil resonates to generate an electromagnetic field with the same frequency, an energy receiving channel is formed, coupling resonance energy is obtained, and alternating current with the same frequency is generated; the rectifying and filtering circuit converts the energy received by the receiving coil into stable direct current; the cascade conversion circuit regulates and processes the direct current to obtain voltage or current suitable for load power supply, and the voltage or the current supplies power to the load to realize wireless transmission of electric energy;
when the system runs, a first detection unit of the detection system acquires system input information, namely output voltage and output current of a high-frequency power supply, and sends the system input information into a transmitting microcontroller after signal conditioning and A/D conversion, and the transmitting microcontroller sends the system input information out through a wireless transmitting module; a wireless receiving module of the control system receives system input information sent by a wireless transmitting module and sends the system input information to a receiving microcontroller; meanwhile, a second detection unit of the control system acquires system output information, namely output voltage and output current of the rectification filter circuit, and the system output information is sent to the receiving microcontroller after signal conditioning and A/D conversion; the third detection unit acquires the working voltage of the cascade conversion circuit, namely the output voltage of the Boost conversion circuit, and sends the working voltage to the receiving microcontroller after signal conditioning and A/D conversion;
when the load or the distance of the system changes, a receiving microcontroller of the control system outputs a PWM signal according to certain disturbance to adjust the duty ratio of a Boost conversion circuit and the duty ratio of a Buck conversion circuit of the cascade conversion circuit, and the control system determines whether the disturbance direction is correct or not by comparing the duty ratio of the Boost conversion circuit and the duty ratio of the Buck conversion circuit with the efficacy power of the system before adjustment; if the disturbance direction is correct, continuing to disturb the output signal according to the original direction for regulation; if the disturbance direction is wrong, disturbance adjustment is carried out according to the reverse direction until the adjustment of the two times before and after ensures that the variation of the efficacy power of the system is controlled within an allowable range, and at the moment, the system works under the condition that the efficacy power reaches the maximum ideal load to realize the tracking of the optimal load.
2. A magnetic coupling resonant wireless energy transmission device for implementing the method of claim 1, comprising a transmitter and a receiver, wherein:
the transmitting device comprises a high-frequency power supply, an impedance matching network, a detection system and a transmitting coil; the detection system comprises a first detection unit, a transmission microcontroller and a wireless transmission module;
the output end of the high-frequency power supply is connected with the input end of the transmitting coil through an impedance matching network; the input end of the first detection unit is connected with the output end of the high-frequency power supply, the output end of the first detection unit is connected with the transmitting microcontroller, and the output end of the transmitting microcontroller is connected with the input end of the wireless transmitting module;
the receiving device comprises a receiving coil, a rectifying and filtering circuit, a cascade conversion circuit, a control system and a load; the cascade conversion circuit comprises a Boost conversion circuit and a Buck conversion circuit; the control system comprises a second detection unit, a third detection unit, a receiving microcontroller and a wireless receiving module;
the output end of the receiving coil is connected with the input end of the Boost conversion circuit through the rectifying and filtering circuit, the output end of the Boost conversion circuit is connected with the input end of the Buck conversion circuit, and the output end of the Buck conversion circuit is connected with a load; the input end of the wireless receiving module is wirelessly connected with the output end of the wireless transmitting module, and the output end of the wireless receiving module is connected with the input end of the receiving microcontroller; the input end of the second detection unit is connected with the output end of the rectification filter circuit, the input end of the third detection unit is connected with the output end of the Boost conversion circuit, and the output ends of the second detection unit and the third detection unit are simultaneously connected with the input end of the receiving microcontroller; the output end of the receiving microcontroller is connected with the control ends of the Boost conversion circuit and the Buck conversion circuit.
3. A magnetic coupling resonant wireless energy transmission device according to claim 2, wherein the first detection unit comprises a first voltage detection unit and a first current detection unit;
the first voltage detection unit consists of a first voltage sensor, a first voltage signal conditioning circuit and a first voltage A/D conversion circuit; the first voltage sensor is arranged at the output end of the high-frequency power supply, the input end of the first voltage signal conditioning circuit is connected with the output end of the first voltage sensor, the output end of the first voltage signal conditioning circuit is connected with the input end of the first voltage A/D conversion circuit, and the output end of the first voltage A/D conversion circuit is connected with the emission microcontroller;
the first current detection unit consists of a first current sensor, a first current signal conditioning circuit and a first current A/D conversion circuit; the first current sensor is arranged at the output end of the high-frequency power supply, the input end of the first current signal conditioning circuit is connected with the output end of the first current sensor, the output end of the first current signal conditioning circuit is connected with the input end of the first current A/D conversion circuit, and the output end of the first current A/D conversion circuit is connected with the emission microcontroller.
4. A magnetic coupling resonant wireless energy transmission device according to claim 2, wherein the second detection unit comprises a second voltage detection unit and a second current detection unit;
the second voltage detection unit consists of a second voltage sensor, a second voltage signal conditioning circuit and a second voltage A/D conversion circuit; the second voltage sensor is arranged at the output end of the rectification filter circuit, the input end of the second voltage signal conditioning circuit is connected with the output end of the second voltage sensor, the output end of the second voltage signal conditioning circuit is connected with the input end of the second voltage A/D conversion circuit, and the output end of the second voltage A/D conversion circuit is connected with the receiving microcontroller;
the second current detection unit consists of a second current sensor, a second current signal conditioning circuit and a second current A/D conversion circuit; the second current sensor is arranged at the output end of the rectifying and filtering circuit, the input end of the second current signal conditioning circuit is connected with the output end of the second current sensor, the output end of the second current signal conditioning circuit is connected with the input end of the second current A/D conversion circuit, and the output end of the second current A/D conversion circuit is connected with the receiving microcontroller.
5. A magnetic coupling resonant wireless energy transmission device according to claim 2, wherein the third detection unit is a third voltage detection unit;
the third voltage detection unit consists of a third voltage sensor, a third voltage signal conditioning circuit and a third voltage A/D conversion circuit; the third voltage sensor is arranged at the output end of the Boost conversion circuit, the input end of the third voltage signal conditioning circuit is connected with the output end of the third voltage sensor, the output end of the third voltage signal conditioning circuit is connected with the input end of the third voltage A/D conversion circuit, and the output end of the third voltage A/D conversion circuit is connected with the receiving microcontroller.
6. A magnetic coupling resonant wireless energy transmission device according to claim 2, wherein the transmitting microcontroller is a single chip microcomputer and the receiving microcontroller is a digital signal processor.
7. A magnetically coupled resonant wireless energy transfer device as claimed in claim 2, wherein the transmitter coil and the receiver coil are identical in structure and fixed at their centers on the same horizontal line.
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