Tianqi Li;Guangce Zheng;Chaoqun Qi;Haoyu Wang;Yu Liu;Minfan Fu
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Small-Signal Modeling of an S-S Compensated IPT System Under Frequency Modulation
Frequency modulation is widely utilized in inductive power transfer systems and is also included in the Qi standard for low-power chargers. This brief examines small-signal modeling and simplification methods using an example of an S-S compensated system under frequency modulation. Initially, it develop models for the resonant components under frequency perturbation, which subsequently help in constructing the model of the resonant tank. By incorporating the models of the inverter and rectifier, it derives a sixth-order model for the entire system. The pole-zero analysis helps simplify this sixth-order model to a third-order and a first-order model. Experimental results show that these models can accurately predict the system’s control-to-output gain up to 1/2, 2/5, and 1/10 of the switching frequency. These models effectively illustrate the impacts of circuit parameters and the trade-offs between accuracy and complexity.
期刊介绍:
TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes:
Circuits: Analog, Digital and Mixed Signal Circuits and Systems
Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic
Circuits and Systems, Power Electronics and Systems
Software for Analog-and-Logic Circuits and Systems
Control aspects of Circuits and Systems.