IEC 62969-2:2018

Semiconductor devices - Semiconductor interface for automotive vehicles - Part 2: Efficiency evaluation methods of wireless power transmission using resonance for automotive vehicles sensors

IEC 62969-2:2018 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.

Dispositifs à semiconducteurs - Interface à semiconducteurs pour les véhicules automobiles - Partie 2: Méthodes d’évaluation du rendement de la transmission d’énergie sans fil par résonance pour les capteurs de véhicules automobiles

L’IEC 62969-2:2018 spécifie les modes opératoires et les définitions permettant de mesurer le rendement du système de transmission d’énergie sans fil pour les capteurs de véhicules automobiles. Le présent document couvre la plage de puissance située au-dessous de 500 mW.

General Information

• Status: Published
• Publication Date: 07-Mar-2018
• ICS: 31.080.99 - Other semiconductor devices
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: TC 47 - Semiconductor devices
• Drafting Committee: WG 7 - TC 47/WG 7
• Current Stage: PPUB - Publication issued
• Start Date: 08-Mar-2018
• Completion Date: 23-Mar-2018

Standards Content (Sample)

IEC 62969-2 ®
Edition1.0 2018-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Semiconductor devices – Semiconductor interface for automotive vehicles –
Part 2: Efficiency evaluation methods of wireless power transmission using
resonance for automotive vehicles sensors

Dispositifs à semiconducteurs – Interface à semiconducteurs pour les véhicules
automobiles –
Partie 2: Méthodes d’évaluation du rendement de la transmission d’énergie sans
fil par résonance pour les capteurs de véhicules automobiles

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IEC 62969-2 ®
Edition 1.0 2018-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Semiconductor devices – Semiconductor interface for automotive vehicles –

Part 2: Efficiency evaluation methods of wireless power transmission using

resonance for automotive vehicles sensors

Dispositifs à semiconducteurs – Interface à semiconducteurs pour les véhicules

automobiles –
Partie 2: Méthodes d’évaluation du rendement de la transmission d’énergie sans

fil par résonance pour les capteurs de véhicules automobiles

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.080.99 ISBN 978-2-8322-5442-4

– 2 – IEC 62969-2:2018 © IEC 2018
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Testing methods . 6
4.1 General . 6
4.2 RF power generation efficiency . 7
4.3 RF coupling efficiency . 8
4.4 RF rectifying efficiency . 9
4.5 DC-DC converting efficiency . 10
4.6 System efficiency . 11

Figure 1 – Schematic diagram of wireless power transmission system . 7
Figure 2 – Measurement schematics for RF power generation efficiency . 8
Figure 3 – Measurement schematics for RF coupling efficiency . 9
Figure 4 – Measurement schematics for RF rectifying efficiency . 10
Figure 5 – Measurement schematics for DC-DC converting efficiency . 10

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SEMICONDUCTOR DEVICES –
SEMICONDUCTOR INTERFACE FOR AUTOMOTIVE VEHICLES –

Part 2: Efficiency evaluation methods of wireless power transmission
using resonance for automotive vehicles sensors

FOREWORD
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International Standard IEC 62969-2 has been prepared by IEC technical committee 47:
Semiconductor devices.
The text of this International Standard is based on the following documents:
FDIS Report on voting
47/2450/FDIS 47/2460/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – IEC 62969-2:2018 © IEC 2018
A list of all the parts in the IEC 62969 series, published under the general title Semiconductor
devices – Semiconductor interface for automotive vehicles, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SEMICONDUCTOR DEVICES –
SEMICONDUCTOR INTERFACE FOR AUTOMOTIVE VEHICLES –

Part 2: Efficiency evaluation methods of wireless power transmission
using resonance for automotive vehicles sensors

1 Scope
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.
– 6 – IEC 62969-2:2018 © IEC 2018
3.6
receiving resonator coil
coil which is receiving wireless power
Note 1 to entry: The receiving resonator coil is part of the basic elements of the resonant wireless power
transmission system.
3.7
load coil
coil which supplies power to the devices
Note 1 to entry: The load coil is part of the basic elements of the resonant wireless power transmission system.
3.8
resonator coil
coil, the inductance and capacitance of which have been determined according to its
geometry
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 coil unit, an R coil unit, a rectifier unit and a
x x
DC-DC converter unit. The T coil unit includes a power driving coil and a transmitting
x
resonator coil. The R coil unit includes a receiving resonator coil and a load coil.
x
The automotive vehicle DC supply means that the supplied electric power which is provided
by vehicle, which voltage can be +12V 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 coil unit and the R coil unit are actually delivering
x x
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 ) should be specified when designing a high frequency circuit and measuring
the high frequency characteristics. Usually the value of Z is 50 Ω.
T coil
x
Power driving coil
Automotive P P
DC1 RF1
RF power
vehicle
generator
DC supply
Transmitting
resonator coil
Transmission
distance
Receiving
resonator coil
P P P
DC3 DC2 RF2
DC-DC
Rectifier
converter
Load coil
R coil
x
Load
IEC
Key
P DC power from automotive vehicle DC supply
DC1
P RF power from RF power generator
RF1
P RF power from R coil
x
RF2
P DC power from rectifier
DC2
P DC power from DC-DC converter

DC3
Figure 1 – Schematic diagram of wireless power transmission system
4.2 RF power generation efficiency
The RF power generation efficiency is defined as the conversion efficiency when the power is
converted from DC power to RF power which is shown in Figure 2. The efficiency is
represented by the ratio of RF output power to the used power for DC input. The efficiency
can be affected by the efficiency of inverter circuit when the used frequency is lower than
1 MHz and the efficiency of power amplifier when the used frequency is higher than 1 MHz.
The efficiency can be calculated by measuring the power calculated from the voltage and
current of P and by measuring the RF power of P using RF power sensor. During the
DC1 RF1
efficiency measurement, the RF output power is adjusted to sufficient. The RF power
generation efficiency shall be given as shown by Formula (1) below:
(1)
where
η
is RF power generation efficiency;
RF
P is RF power from RF power generator;

RF1
P is DC power from automotive vehicle DC supply.
DC1
– 8 – IEC 62969-2:2018 © IEC 2018
Digital multi-meter
or
oscilloscope
Coupler
Automotive
P
P
DC1
RF1
RF power
vehicle
generator
DC supply
Z
Z 0
RF power
sensor
IEC
Figure 2 – Measurement schematics for RF power generation efficiency
4.3 RF coupling efficiency
The RF coupling efficiency is defined as the transmission efficiency when the signal is
transferred wirelessly which is shown in Figure 3. The efficiency is represented by the ratio of
RF output power to the RF input power. The efficiency can be affected by the coupling of
between transfer and receiver part, the resistance loss between transfer and receiver part,
radiation. The RF coupling efficiency is major efficiency of the wireless power transmission
system.
The RF coupling efficiency can be measured by s-parameter using Vector Network Analyser
(VNA). The RF coupling efficiency shall be given as shown by Formula (2) below:
(2)
where
η
is RF coupling efficiency;
Coupling
P is RF power from RF power generator;
RF1
P is RF power from R coil.
RF2 x
Transmission
distance
Power driving
Load coil
coil
Transmitting Receiving
resonator coil resonator coil
P P
RF1 RF2
Vector network
analyzer
IEC
Figure 3 – Measurement schematics for RF coupling efficiency
4.4 RF rectifying efficiency
The RF rectifying efficiency is defined as the efficiency when the power is transferred from
P to P which is shown in Figure 4. The RF rectifying efficiency is represented by the
RF2 DC2
power ratio of DC output power by rectifying circuit to received RF input power. The RF
rectifying efficiency can be affected by the diodes efficiency. The RF rectifying efficiency shall
be given as shown by Formula (3) below:
(3)
where
η
is RF rectifying efficiency;
Rect
P is DC power from rectifier;
DC2
P is RF power from R coil.
RF2 x
– 10 – IEC 62969-2:2018 © IEC 2018
Digital multi-meter
or
oscilloscope
Coupler
P P
RF2 DC2
Power
Signal
Rectifier
amplifier
generator
R of DC-DC
Z IN
converter
RF power
sensor
IEC
...