研究目的
Investigating the maximum power transmission problem in wireless power transmission (WPT) systems by transforming the maximum power tracking (MPT) problem into the critical coupling point tracking (CCPT) problem.
研究成果
The study demonstrates that maximum power tracking for a class of MCR WPT systems can be achieved by pushing the system on the CCP. By adding a DC-DC converter on the receiving side and adjusting the duty cycle, the system can reach the maximum power point in a short time, showing the effectiveness of the proposed method.
研究不足
The practical application of changing the coils distance to realize CCP is difficult, especially in scenarios like wireless charging of electric vehicles.
1：Experimental Design and Method Selection:
The study involves the establishment of a load power model for the magnetic resonant coupling WPT system with string-to-string structure, followed by theoretical performance analysis using the power normalization method to identify the critical coupling point (CCP).
2：Sample Selection and Data Sources:
The system parameters include inductances L1 and L2, capacitances C1 and C2, internal resistances R1 and R2, and mutual inductance M between the coils.
3：List of Experimental Equipment and Materials:
High-frequency inverter, transmitting coil, receiving coil, resonant compensation capacitor, rectifier with filter, resistance load, and a DC-DC converter.
4：Experimental Procedures and Operational Workflow:
The system is designed to work in the resonant state, with the load voltage and current collected to calculate the load power. The duty cycle of the converter is adjusted dynamically to achieve maximum power.
5：Data Analysis Methods:
The relationship between the CCP and load resistance is analyzed, and the effectiveness of the proposed method is verified through simulation.
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high-frequency inverter
Converts DC power to high-frequency AC power for the WPT system.
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transmitting coil
Generates a magnetic field for power transmission.
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receiving coil
Receives power from the transmitting coil through magnetic resonance coupling.
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resonant compensation capacitor
Compensates for the inductive reactance in the resonant circuit to achieve resonance.
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rectifier with filter
Converts AC power to DC power and filters out the ripple.
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resistance load
Simulates the load in the WPT system.
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DC-DC converter
Adjusts the equivalent load resistance dynamically to achieve maximum power tracking.
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