Measuring Wireless Power Transfer Efficiency (1)


Transmission efficiency of the wireless power transfer (WPT) system can be measured with a vector network analyzer (VNWA). The following picture shows how we measured the transmission efficiency of this system. The yellow WPT coil in the left side is connected to the port 1 of VNWA, while the blue WPT coil in the right side is connected to the port 2 of VNWA. The resonant frequency of this system…


Measuring Lumped Elements Values for WPT coil


Hello. I will explain how to measure and  decide  lumped elements values for WPT coil. Here is the WPT coil that I made for my experiments. The WPT coil consists of a resonant coil and a feed coil with SMA connector. The resonant coil is spiral and has parasitic capacitance between the spiral lines and this capacitance make this coil resonate at LC resonant frequency. The feed coil is a…


Z parameters of the coupled inductors network


Circuit theory is very good tool to understand and calculate the WPT system. In order to understand what happens in the magnetic coupling in circuit theory, two port network theory provides us good knowledge. Let’s start discussion with the following figure. The figure shows the schematic of the 2-port network. the 2-port network will be anything such as band pass filter, transmission line or WPT system. We can describe this…