研究目的
Presenting a discontinuous conduction mode (DCM) zero-voltage switching (ZVS) scheme for a class-D power amplifier (PA) for wireless power transfer, reducing the sizes of the ZVS inductor and capacitor by 7.5 and 5 times while maintaining high power conversion efficiency (PCE).
研究成果
The proposed DCM ZVS scheme for class-D PA reduces sizes of ZVS inductor and capacitor by 7.5 and 5 times while maintaining a high PCE, achieving a peak efficiency of 87.0% at 7.18 W output power.
研究不足
The study focuses on a specific application (wireless power transfer) and process technology (0.35 μm high-voltage CMOS), which may limit generalizability to other contexts or technologies.
1：Experimental Design and Method Selection
The study presents a DCM ZVS scheme for a class-D PA, utilizing a time-based controller for fractional control of power transistor strength and fast transient response.
2：Sample Selection and Data Sources
The class-D PA was fabricated with a 0.35 μm high-voltage CMOS process, with measurements taken under varying supply voltage and output current conditions.
3：List of Experimental Equipment and Materials
ZVS LC resonant tank consisting of a 39 nH inductor and a 200 nF capacitor, switching frequency of 6.78 MHz, and supply voltage of 20 V.
4：Experimental Procedures and Operational Workflow
The PA's performance was evaluated by measuring output power and efficiency under specified conditions, demonstrating the effectiveness of the DCM ZVS scheme.
5：Data Analysis Methods
Measurement results were analyzed to determine output power and efficiency, comparing the proposed DCM ZVS scheme with conventional CCM ZVS and hard-switching schemes.
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