IEC 62969-2-2018 pdf download.Semiconductor devices – Semiconductor interface for automotive vehicles – Part 2: Efficiency evaluation methods of wireless power transmission using resonance for automotive vehicles sensors.
This part of IEC 62969 specifies procedures and definitions for measuring the efficiency of the
wireless power transmission system for the automotive vehicles sensors. This document deals with the power range below 500 mW.
2 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.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 wireless power transfer
technology of power transmission/receiving without power line
3.2 resonance frequency
f 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 the two coils which make magnetic inductive coupling
3.4 power driving coil
coil which receives RF power directly
Note 1 to entry: The power driving coil is part of the basic elements of the resonant wireless power transmission system.
3.5 transmitting resonator coil
coil which transfers power using magnetic resonance
Note 1 to entry: The transmitting resonator coil is part of the basic elements of the resonant wireless power transmission system.
4 Testing methods 4.1 General The concept of resonant wireless power transfer system is shown in Figure 1 and efficiency is a function of the loading conditions (e.g. light load, medium load, and full load) as well as the degree of coupling between the transmission and receiver coils (e.g. weak coupling or perfect coupling). The system comprises six main functional units which are an automotive vehicle DC supply unit, a RF power generator unit, a T x coil unit, an R x coil unit, a rectifier unit and a DC-DC converter unit. The T x coil unit includes a power driving coil and a transmitting resonator coil. The R x coil unit includes a receiving resonator coil and a load coil. The automotive vehicle DC supply means that the supplied electric power which is provided by vehicle, which voltage can be +1 2V or +24V. The RF power generator unit is the circuit which can convert DC power to RF power. At this time, the frequency of RF power can be hundreds of kHz to tens of MHz. The T x coil unit and the R x coil unit are actually delivering power wirelessly. The rectifier unit is the electric circuit which can convert RF power to DC power. The DC-DC converter unit converts the level of DC voltage. The rectified voltage is different 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 characteristic impedance (Z 0 ) should be specified when designing a high frequency circuit and measuring the high frequency characteristics. Usually the value of Z 0 is 50 Ω.IEC 62969-2 pdf download.