EN IEC 62969-2-2018 pdf free.Semiconductor devices – Semiconductor interface for automotive vehicles – Part 2: Efficiency evaluation methods of wirelesspower transmission using resonance for automotive vehicles sensors (IEC 62969-2:2018).
This part of lEC 62969 specifies procedures and definitions for measuring the efficiency of thewireless power transmission system for the automotive vehicles sensors. This document dealswith the power range below 500 mw.
Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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3.1 wireless power transfer technology of power transmission/receiving without power line
3.2 resonance frequency special frequency which is determined by inductance and capacitance of the coil.
3.3 resonant wireless power transfer energy transfer maximizing method using the concord of resonance frequency between thetwo coils which make magnetic inductive coupling.
4.1General
The concept of resonant wireless power transfer system is shown in Figure 1 and efficiency isa function of the loading conditions (e.g. light load, medium load, and full load) as well as thedegree of coupling between the transmission and receiver coils (e.g. weak coupling or perfectcoupling). The system comprises six main functional units which are an automotive vehicleDC supply unit,a RF power generator unit, a T, coil unit, an R, coil unit, a rectifier unit and aDc-DC converter unit. The T, coil unit includes a power driving coil and a transmittingresonator coil.The R, coil unit includes a receiving resonator coil and a load coil.
The automotive vehicle DC supply means that the supplied electric power which is providedby vehicle，which voltage can be +12V or +24v.The RF power generator unit is the circuitwhich can convert DC power to RF power.At this time, the frequency of RF power can behundreds of kHz to tens of MHz.The T, coil unit and the R, coil unit are actually deliveringpower wirelessly.The rectifier unit is the electric circuit which can convert RF power to Dcpower. The DC-DC converter unit converts the level of DC voltage.The rectified voltage isdifferent from the voltage for driving a load. Therefore,the DC-DC converter is required.Finally a load can be connected to the output of DC-DC converter.The value of characteristicimpedance(Zo) should be specified when designing a high frequency circuit and measuringthe high frequency characteristics. Usually the value of z is 50 Q.EN IEC 62969-2 pdf download.