研究目的
To stabilize the load voltage in wireless power transfer systems with constant power loads using a secondary-side-only control strategy without communication with the primary side, avoiding discontinuous operation and big voltage transients.
研究成果
The proposed secondary-side-only control using symmetric phase shift and a PI controller effectively stabilizes the load voltage for constant power loads in WPT systems without communication with the primary side, providing smooth transients and simplicity in design. Experimental results confirm stability under various conditions, but limitations exist due to physical constraints of the system. Future work should focus on higher power experiments, efficiency improvements, and testing with real motor loads.
研究不足
The control has intrinsic stability limits dependent on the DC source voltage and mutual inductance; if secondary current or voltage exceeds these limits, stability cannot be maintained. Efficiency is not optimized and may be lower due to switching losses in phase shift operation. The method requires an FPGA for implementation, which may add complexity and cost.
1：Experimental Design and Method Selection:
The study uses a series-series compensated WPT system with a single AC/DC converter on the secondary side. The control method involves symmetric phase shift combined with synchronous rectification, implemented using a digital phase-locked loop (PLL) and a PI controller for voltage stabilization.
2：Sample Selection and Data Sources:
Experiments are conducted with a constant power load (simulated or actual, such as a motor) under varying conditions of voltage reference, power level, mutual inductance, and primary source voltage.
3：List of Experimental Equipment and Materials:
Includes an FPGA for control, power MOSFETs in H-bridge converters, current sensors, DC smoothing capacitors, coils with specific inductances and resistances, and a DC voltage source.
4：Experimental Procedures and Operational Workflow:
The FPGA generates PWM signals for the converters. The PLL synchronizes with the secondary current, and the PI controller adjusts the phase shift parameter tα to regulate the secondary voltage. Experiments involve step changes in voltage reference and variations in mutual inductance to test stability and performance.
5：Data Analysis Methods:
Data on voltage, current, and conversion ratio are collected and analyzed to verify stability, using theoretical models and pole placement for controller design.
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