研究目的
To propose a control strategy for voltage stabilization in wireless power transfer systems with constant power load, using only the secondary side without communication or primary side regulation, to avoid discontinuous operation and big voltage transients.
研究成果
The proposed secondary-side-only control using symmetric phase shift and PI feedback effectively stabilizes constant power load voltage in wireless power transfer systems, avoiding discontinuous operation and reducing transients. Experimental results confirm stability under various parameter changes, but inherent physical limits exist. Future work should focus on higher power experiments and better transient analysis.
研究不足
The control has intrinsic stability limits dependent on circuit parameters, DC source voltage, and mutual inductance. If secondary current or voltage exceeds these limits (e.g., conversion ratio α cannot exceed 1), stability cannot be maintained. The method requires high-performance FPGA for digital PLL implementation, and noise issues may arise from primary side switching. It is verified only in static scenarios, with dynamic conditions like coil movement partially addressed but not fully explored.
1：Experimental Design and Method Selection:
The study uses a wireless power transfer system with series-series compensation. The control method involves a PI feedback controller applied to the secondary side full active rectifier, utilizing synchronous rectification and symmetric phase shift to regulate voltage without primary side manipulation.
2：Sample Selection and Data Sources:
The system parameters are defined in Table I, including coil resistances, inductances, capacitances, operation frequency, mutual inductance, and smoothing capacitor. Experiments are conducted with varying voltage references and load powers.
3：List of Experimental Equipment and Materials:
Includes a primary side inverter, secondary side full bridge active rectifier, constant power load (e.g., motor driven by a three-phase inverter), FPGA for control, current and voltage sensors, and components like MOSFETs and capacitors as per system parameters.
4：Experimental Procedures and Operational Workflow:
The setup involves controlling both converters with an FPGA, measuring DC side currents and voltages, and an AC current sensor for PLL. Stability is verified by step-wise changes in voltage reference and mutual inductance, with data collected on voltage, current, and conversion ratio.
5：Data Analysis Methods:
Data is analyzed using pole placement method for controller design, Routh stability criterion, and Fourier expansion for waveform analysis. Results are presented graphically to show voltage stability and transient responses.
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