Primary Side Circuit Design of a Multi-coil Inductive System for Powering Wireless Sensors

Abstract Circuit design of the primary side is decisive for the efficiency of inductive energy transmission. In order to maximise the transmitted energy to the load, primary side DC/AC inverter and system resonance topologies should be investigated. This paper presents an inverter for a multi-coil inductive system with different system resonance topologies for a low voltage and a relative high frequency of 1.2 MHz. A comparison between half-wave and full-wave inverters is carried out for both Series-Series (SS) and Parallel-Parallel (PP) topologies. Results show that the full-wave inverter with PP topology is adequate primary side circuit for multi-coil inductive system and reaches a sending power 10 times higher than a classical half wave inverter.

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