Apparatus and methods for measuring energy conversion efficiency in wireless power transmission systems

Abstract

This invention discloses a device and method for measuring the energy conversion efficiency of a wireless power transmission system, belonging to the field of wireless power transmission efficiency measurement. The device includes a PCB transmitting coil, a PCB receiving coil, a power measurement circuit, an inductance measurement circuit, and multiple switches, which can be used to connect to either the power measurement circuit or the inductance measurement circuit. The power measurement circuit includes a signal generator, a compensation capacitor, a mode-taking resistor, a load resistor, and an oscilloscope; the inductance measurement circuit includes a self-inductance measurement circuit and a mutual inductance measurement circuit, which, in conjunction with an impedance analyzer, measure the coil's self-inductance, mutual inductance, and same / reverse series inductance. The method calculates the theoretical and experimental efficiency by measuring parameters such as coil inductance, mutual inductance, coupling coefficient, quality factor, voltage, and phase difference, and can optimize the load resistance. This invention features high integration, ease of operation, and real-time efficiency monitoring, making it suitable for physics experiment teaching and industrial design verification.

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