**6. Test Technologies**

A first test bench is used for recording the efficiency, the offset, the temperatures and the EMC emissions of the pad. Initially, various concepts were developed for recording the above-mentioned variables, whereby the determination of the efficiency or the associated measurement of current and voltage proved to be the most difficult task. Due to the high frequencies of the voltage at the charging pads, it was not possible to use the most common measuring devices. A further challenge was the necessary galvanic isolation, as few measuring systems available on the market have one.

For this reason, completely galvanically isolated measurement electronics was developed and implemented on a 3-Axis linar production cell. In order to detect possible temperature changes in the charge pads or other components of the contactless power transmission system, a temperature measuring system was designed and developed. In order to be able to carry out EMC measurements, an EMC probe was integrated into the test bench. Through the produced serial cable and the integration into the created LabView, the probe can be used for measurement. At the serial output, it supplies only field strengths

averaged over all spatial axes, but this is sufficient for an evaluation of the measured field strengths. IPT systems, as the limit values to be complied with by legislators, are determined in the same way.

In a second step, an EOL test was build up. It is able to measure the quality factor of the coil or the transmission efficiency in power transmission mode.
