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This paper presents an analytical model of the impedance between two coils supported by ferrite shield. The new model is not restricted to round coils and applies to more complex winding geometries, as specified by the Wireless Power Consortium. The mutual inductance is derived by solving Maxwell's equations and using Bessel function of the first kind. The model results are compared with experimental...
This paper presents a power-loss model for Lateral- Diffused MOSFETs (LDMOSs) in application-specific integrated circuits (ASICs) in the field of wireless power-transfer system applications. Both the transmitter and receiver power-stages integrated in their respective ASIC units were considered, and the total system efficiency was subsequently estimated. Layout parasitics pertaining to the primary...
This paper presents a multi-objective genetic algorithm (GA) for a wireless power transfer system composed of a full-bridge series-resonant inverter (FBSRI), a synchronous full-bridge rectifier (SFBR) and a buck converter. The proposed algorithm maximizes the total system efficiency by optimizing the switching frequency of the FBSRI and the SFBR output voltage, subject to their respective design constraints...
An Li-ion battery charger based on a charge-control buck regulator operating at 2.2 MHz is implemented in 180 nm CMOS technology. The novelty of the proposed charge-control converter consists of regulating the average output current by only sensing a portion of the inductor current and using an adaptive reference voltage. By adopting this approach, the charger average output current is set to a constant...
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