IEC PAS 63095-2:2017

IEC PAS 63095-2 ®
Edition 1.0 2017-06
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
colour
inside
The Qi wireless power transfer system – Power class 0 specification –
Part 2: Reference Designs Version.1.1.2

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IEC PAS 63095-2 ®
Edition 1.0 2017-06
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
colour
inside
The Qi wireless power transfer system – Power class 0 specification –

Part 2: Reference Designs Version.1.1.2

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.99; 33.160.99; 35.200 ISBN 978-2-8322-4459-3

– 1 – IEC PAS 63095-2:2017 © IEC 2017
Contents
1 General . 6
1.1 Introduction . 6
1.2 Scope . 6
1.2.1 Current Specification structure (introduced in version 1.2.1) . 6
1.2.2 Earlier Specification structure (version 1.2.0 and below) . 7
1.3 Main features . 7
1.4 Conformance and references . 8
1.4.1 Conformance . 8
1.4.2 References . 8
1.5 Definitions . 9
1.6 Acronyms . 12
1.7 Symbols . 14
1.8 Conventions . 15
1.8.1 Cross references . 15
1.8.2 Informative text . 15
1.8.3 Terms in capitals . 15
1.8.4 Units of physical quantities . 15
1.8.5 Decimal separator . 15
1.8.6 Notation of numbers . 16
1.8.7 Bit ordering in a byte . 16
1.8.8 Byte numbering . 16
1.8.9 Multiple-bit fields . 17
1.9 Operators . 17
1.9.1 Exclusive-OR . 17
1.9.2 Concatenation . 17
1.10 Measurement equipment . 17
2 Power Transmitter reference designs . 18
2.1 Introduction . 18
2.2 Baseline Power Profile designs that activate a single Primary Coil at a time . 18
2.2.1 Power Transmitter design A1 . 19
2.2.2 Power Transmitter design A2 . 20
2.2.3 Power Transmitter design A3 . 25
2.2.4 Power Transmitter design A4 . 29

2.2.5 Power Transmitter design A5 . 35
2.2.6 Power Transmitter design A6 . 36
2.2.7 Power Transmitter design A7 . 43
2.2.8 Power Transmitter design A8 . 47
2.2.9 Power Transmitter design A9 . 52
2.2.10 Power Transmitter design A10 . 53
2.2.11 Power Transmitter design A11 . 60
2.2.12 Power Transmitter design A12 . 66
2.2.13 Power Transmitter design A13 . 72
2.2.14 Power Transmitter design A14 . 78
2.2.15 Power Transmitter design A15 . 84
2.2.16 Power Transmitter design A16 . 89
2.2.17 Power Transmitter design A17 . 95
2.2.18 Power Transmitter design A18 . 101
2.2.19 Power Transmitter design A19 . 106
2.2.20 Power Transmitter design A20 . 112
2.2.21 Power Transmitter design A21 . 117
2.2.22 Power Transmitter design A22 . 124
2.2.23 Power Transmitter design A23 . 130
2.2.24 Power Transmitter design A24 . 136
2.2.25 Power Transmitter design A25 . 142
2.2.26 Power Transmitter design A26 . 148
2.2.27 Power Transmitter design A27 . 154
2.2.28 Power Transmitter design A28 . 160
2.2.29 Power Transmitter design A29 . 167
2.2.30 Power Transmitter design A30 . 172
2.2.31 Power Transmitter design A31 . 177
2.2.32 Power Transmitter design A32 . 182
2.2.33 Power Transmitter design A33 . 190
2.2.34 Power Transmitter design A34 . 199
2.3 Baseline Power Profile designs that activate multiple Primary Coils simultaneously . 205
2.3.1 Power Transmitter design B1 . 205
2.3.2 Power Transmitter design B2 . 213
2.3.3 Power Transmitter design B3 . 218
2.3.4 Power Transmitter design B4 . 225
2.3.5 Power Transmitter design B5 . 233
2.3.6 Power Transmitter design B6 . 242
2.3.7 Power Transmitter design B7 . 250

– 3 – IEC PAS 63095-2:2017 © IEC 2017
2.4 Extended Power Profile Power Transmitter designs . 257
2.4.1 Power Transmitter design MP-A1 . 257
2.4.2 Power Transmitter design MP-A2 . 264
2.4.3 Power Transmitter design MP-A3 . 272
2.4.4 Power Transmitter design MP-A4 . 278
2.4.5 Power Transmitter design MP-A5 . 286
3 Power Receiver reference designs (Informative) . 291
3.1 Power Receiver example 1 (5W) . 291
3.1.1 Mechanical details . 291
3.1.2 Electrical details . 293
3.2 Power Receiver example 2 (5W) . 295
3.2.1 Mechanical details . 295
3.2.2 Electrical details . 297
3.3 Power Receiver example 3 (8 W) . 298
3.3.1 Mechanical details . 298
3.3.2 Electrical details . 300
3.4 Power Receiver example 4 (15 W) . 301
3.4.1 Mechanical details . 301
3.4.2 Electrical details . 303
3.5 Power Receiver example 5 (12 W) . 305
3.5.1 Mechanical details . 305
3.5.2 Electrical details . 306
Annex A History of Changes . 308

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
THE QI WIRELESS POWER TRANSFER SYSTEM –
POWER CLASS 0 SPECIFICATION –
Part 2: Reference Designs Version.1.1.2

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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in the subject dealt with may participate in this preparatory work. International, governmental and non-
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
A PAS is a technical specification not fulfilling the requirements for a standard, but made
available to the public.
IEC PAS 63095-2 has been processed by technical area 15: Wireless power transfer, of IEC
technical committee 100: Audio, video and multimedia systems and equipment.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document
Draft PAS Report on voting
100/2827/PAS 100/2862/RVDPAS
Following publication of this PAS, which is a pre-standard publication, the technical committee
or subcommittee concerned may transform it into an International Standard.

– 5 – IEC PAS 63095-2:2017 © IEC 2017
This PAS shall remain valid for an initial maximum period of 3 years starting from the
publication date. The validity may be extended for a single period up to a maximum of
3 years, at the end of which it shall be published as another type of normative document, or
shall be withdrawn.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
1 General
1.1 Introduction
The Wireless Power Consortium (WPC) is a worldwide organization that aims to develop and promote
global standards for wireless power transfer in various application areas. A first application area is
wireless charging of low and medium power devices, such as mobile phones and tablet computers. The
Wireless Power Consortium maintains the Qi logo for this application area.
1.2 Scope
This document, Part 4: Reference Designs, comprises reference designs for Power Class 0 Base Stations
and Mobile Devices. Power Class 0 is the WPC designation for flat-surface devices, such as chargers,
mobile phones, tablets, cameras, and battery packs, in the Baseline Power Profile (≤ 5 W) and Extended
Power Profile (≤ 15 W).
1.2.1 Current Specification structure (introduced in version 1.2.1)
The Qi Wireless Power Transfer System for Power Class 0 Specification consists of the following
documents.
 Parts 1 and 2: Interface Definitions
 Part 1: Primary Interface Definition
 Part 2: Secondary Interface Definition
 Part 3: Compliance Testing
 Part 4: Reference Designs (this document)
NOTE WPC publications prior to version 1.2.1 were structured differently, and are listed in Section 1.2.2 below. In
particular, the Low Power and Medium Power publications were divided into separate System Description
documents. Beginning with version 1.2.1, the Low Power and Medium Power System Descriptions have been merged
into the Specification structure shown in this section. Additionally, the terms Low Power and Medium Power have
been replaced in the current Specification by the terms Baseline Power Profile and Extended Power Profile
respectively.
– 7 – IEC PAS 63095-2:2017 © IEC 2017
1.2.2 Earlier Specification structure (version 1.2.0 and below)
Before release 1.2.1, the Wireless Power Transfer specification comprised the following documents.
 System Description, Wireless Power Transfer, Volume I: Low Power, Part 1: Interface Definition.
 System Description, Wireless Power Transfer, Volume I: Low Power, Part 2: Performance
Requirements.
 System Description, Wireless Power Transfer, Volume I: Low Power, Part 3: Compliance Testing.
 System Description, Qi Wireless Power Transfer, Volume II: Medium Power.
1.3 Main features
 A method of contactless power transfer from a Base Station to a Mobile Device that is based on near
field magnetic induction between coils.
 A Baseline Power Profile supporting transfer of up to about 5 W and an Extended Power Profile
supporting transfer of up to about 15 W of power using an appropriate Secondary Coil (having a
typical outer dimension of around 40 mm).
 Operation at frequencies in the 87…205 kHz range.
 Support for two methods of placing the Mobile Device on the surface of the Base Station:
 Guided Positioning helps a user to properly place the Mobile Device on the surface of a Base
Station that provides power through a single or a few fixed locations of that surface.
 Free Positioning enables arbitrary placement of the Mobile Device on the surface of a Base Station
that can provide power through any location of that surface.
 A simple communications protocol enabling the Mobile Device to take full control of the power
transfer.
 Considerable design flexibility for integration of the system into a Mobile Device.
 Very low stand-by power achievable (implementation dependent).

1.4 Conformance and references
1.4.1 Conformance
All provisions in The Qi Wireless Power Transfer System, Power Class 0 Specification are mandatory,
unless specifically indicated as recommended, optional, note, example, or informative. Verbal expression
of provisions in this Specification follow the rules provided in Annex H of ISO/IEC Directives, Part 2. For
clarity, the word “shall” indicates a requirement that is to be followed strictly in order to conform to The
Qi Wireless Power Transfer System, Power Class 0 Specification, and from which no deviation is
permitted. The word “should” indicates that among several possibilities one is recommended as
particularly suitable, without mentioning or excluding others, or that a certain course of action is
preferred but not necessarily required, or that in the negative form a certain possibility or course of
action is deprecated but not prohibited. The word “may” indicates a course of action permissible within
the limits of The Qi Wireless Power Transfer System, Power Class 0 Specification. The word “can”
indicates a possibility or capability, whether material, physical, or causal.
1.4.2 References
For undated references, the most recently published Specification applies. The most recent WPC
publications can be downloaded from http://www.wirelesspowerconsortium.com. (See Section 1.2.1 for
a list of documents included in The Qi Wireless Power Transfer System for Power Class 0 Specification.)
In addition, the following documents are referenced within The Qi Wireless Power Transfer System for
Power Class 0 Specification.
 Product Registration Procedure Web page (WPC Web site for members, Testing & Registration
section)
 Qi Product Registration Manual, Logo Licensee/Manufacturer
 Qi Product Registration Manual, Authorized Test Lab
 Power Receiver Manufacturer Codes, Wireless Power Consortium
 The International System of Units (SI), Bureau International des Poids et Mesures

– 9 – IEC PAS 63095-2:2017 © IEC 2017
1.5 Definitions
Active Area The part of the Interface Surface of a Base Station or Mobile Device through which a
sufficiently high magnetic flux penetrates when the Base Station is providing power
to the Mobile Device.
Base Station A device that is able to provide near field inductive power as specified in The Qi
Wireless Power Transfer System, Power Class 0 Specification. A Base Station carries
a logo to visually indicate to a user that the Base Station complies with The Qi
Wireless Power Transfer System, Power Class 0 Specification.
Baseline Power Profile
The minimum set of features applying to Power Transmitters and Power Receivers
that can transfer no more than around 5 W of power.
Communications and Control Unit
The functional part of a Power Transmitter or Power Receiver that controls the
power transfer.
NOTE With regard to implementation, the Communications and Control Unit may be
distributed over multiple subsystems of the Base Station or Mobile Device.
Control Point The combination of voltage and current provided at the output of the Power
Receiver, and other parameters that are specific to a particular Power Receiver
implementation.
Detection Unit The functional part of a Power Transmitter that detects the presence of a Power
Receiver on the Interface Surface.
Digital Ping The application of a Power Signal in order to detect and identify a Power Receiver.
Extended Power Profile
The minimum set of features applying to Power Transmitters and Power Receivers
that can transfer power above 5 W.
Free Positioning A method of positioning a Mobile Device on the Interface Surface of a Base Station
that does not require the user to align the Active Area of the Mobile Device to the
Active Area of the Base Station.
Foreign Object Any object that is positioned on the Interface Surface of a Base Station, but is not
part of a Mobile Device.
Foreign Object Detection
A process that a Power Transmitter or Power Receiver executes in order to
determine if a Foreign Object is present on the Interface Surface.
Friendly Metal A part of a Base Station or a Mobile Device in which a Power Transmitter’s magnetic
field can generate eddy currents.
Guaranteed Power The amount of output power of an appropriate reference Power Receiver that the
Power Transmitter ensures is available at any time during the power transfer phase.
For Power Transmitters that comply with the Baseline Power Profile, the reference
is TPR#1A, which is defined in Part 3: Compliance Testing. For Power Transmitters
that comply with the Extended Power Profile, the reference is TPR#MP1B, which is
also defined in Part 3: Compliance Testing.
Guided Positioning A method of positioning a Mobile Device on the Interface Surface of a Base Station
that provides the user with feedback to properly align the Active Area of the Mobile
Device to the Active Area of the Base Station.
Interface Surface The flat part of the surface of a Base Station that is closest to the Primary Coil(s), or
the flat part of the surface of the Mobile Device that is closest to the Secondary Coil.
Maximum Power The maximum amount of power that a Power Receiver expects to provide at its
output throughout the power transfer phase. The Maximum Power serves as a
scaling factor for the Received Power Values that a Power Receiver reports in its
Received Power Packets.
Mobile Device A device that is able to consume near field inductive power as specified in The Qi
Wireless Power Transfer System, Power Class 0 Specification. A Mobile Device
carries a logo to visually indicate to a user that the Mobile Device complies with the
Specification.
Operating Frequency
The oscillation frequency of the Power Signal.
Operating Point The combination of the frequency, duty cycle, and amplitude of the voltage that is
applied to the Primary Cell.
Packet A data structure for communicating a message from a Power Receiver to a Power
Transmitter or vice versa. A Packet consists of a preamble, a header byte, a message,
and a checksum. A Packet is named after the kind of message that it contains.

– 11 – IEC PAS 63095-2:2017 © IEC 2017
Potential Power The amount of output power by an appropriate reference Power Receiver that the
Power Transmitter can make available during the power transfer phase. For Power
Transmitters that comply with the Baseline Power Profile, the reference is TPR#1A,
which is defined in Part 3: Compliance Testing. For Power Transmitters that comply
with the Extended Power Profile, the reference is TPR#MP1B, which is also defined
in Part 3: Compliance Testing.
Power Conversion Unit
The functional part of a Power Transmitter that converts electrical energy to a
Power Signal.
Power Factor The ratio of the active power consumed and the apparent power drawn. The active
power is expressed in watts. The apparent power typically is expressed in volt-
amperes (VA).
Power Pick-up Unit The functional part of a Power Receiver that converts a Power Signal to electrical
energy.
Power Receiver The subsystem of a Mobile Device that acquires near field inductive power and
controls its availability at its output, as defined in The Qi Wireless Power Transfer
System, Power Class 0 Specification. For this purpose, the Power Receiver
communicates its power requirements to the Power Transmitter.
Power Signal The oscillating magnetic flux that is enclosed by a Primary Cell and possibly a
Secondary Coil.
Power Transfer Contract
A set of boundary conditions on the parameters that characterize the power
transfer from a Power Transmitter to a Power Receiver. Violation of any of these
boundary conditions causes the power transfer to abort.
Power Transmitter The subsystem of a Base Station that generates near field inductive power and
controls its transfer to a Power Receiver, as defined in The Qi Wireless Power
Transfer System, Power Class 0 Specification.
Primary Cell A single Primary Coil or a combination of Primary Coils that are used to provide a
sufficiently high magnetic flux through the Active Area.
Primary Coil A component of a Power Transmitter that converts electric current to magnetic flux.

Received Power The total amount of power dissipated inside a Mobile Device, due to the magnetic
field generated by a Power Transmitter. The Received Power includes the power
that the Power Receiver makes available at its output for use by the Mobile Device,
any power that the Power Receiver uses for its own purposes, as well as any power
that is lost within the Mobile Device.
Reference Quality Factor
The quality-factor of Test Power Transmitter #MP1’s Primary Coil at an Operating
Frequency of 100 kHz, with a Power Receiver positioned on the Interface Surface
and no Foreign Object nearby.
Response A sequence of eight consecutive bi-phase modulated bits transmitted by a Power
Transmitter in response to a request from a Power Receiver.
Secondary Coil The component of a Power Receiver that converts magnetic flux to electromotive
force.
Shielding A component in the Power Transmitter that restricts magnetic fields to the
appropriate parts of the Base Station, or a component in the Power Receiver that
restricts magnetic fields to the appropriate parts of the Mobile Device.
Specification The set of documents, Parts 1 through 4, that comprise The Qi Wireless Power
Transfer System, Power Class 0 Specification (see Section 1.2.1).
Transmitted Power The total amount of power dissipated outside the Interface Surface of a Base Station,
due to the magnetic field generated by the Power Transmitter.
WPID A 48-bit number that uniquely identifies a Qi-compliant device.
1.6 Acronyms
AC Alternating Current
ACK Acknowledge
AWG American Wire Gauge
BSUT Base Station Under Test
CEP Control Error Packet
DC Direct Current
DCR Direct Current Resistance
– 13 – IEC PAS 63095-2:2017 © IEC 2017
EM Electro Magnetic
EMC Electro Magnetic Compatibility
EMF Electro Magnetic Fields
EPT End Power Transfer
ESR Equivalent Series Resistance
FET Field Effect Transistor
FOD Foreign Object Detection
FSK Frequency-Shift Keying
LSB Least Significant Bit
MSB Most Significant Bit
MDUT Mobile Device Under Test
N.A. Not Applicable
NAK Not-Acknowledge
ND Not-Defined
PID Proportional Integral Differential
PRx Power Receiver
PTx Power Transmitter
RMS Root Mean Square
TPR Test Power Receiver
UART Universal Asynchronous Receiver Transmitter
USB Universal Serial Bus
WPID Wireless Power Identifier

1.7 Symbols
Cd Capacitance parallel to the Secondary Coil [nF]
Cm Capacitance in the impedance matching network [nF]
𝐶 Capacitance in series with the Primary Coil [nF]
P
C Capacitance in series with the Secondary Coil [nF]
S
𝑑 Duty cycle of the inverter in the Power Transmitter
𝑑 Distance between a coil and its Shielding [mm]
s
𝑑 Distance between a coil and the Interface Surface [mm]
z
𝑓 Communications bit rate [kHz]
CLK
𝑓 Resonant detection frequency [kHz]
d
𝑓 Operating Frequency [kHz]
op
𝑓 Secondary resonance frequency [kHz]
S
𝐼 Primary Coil current modulation depth [mA]
m
𝐼 Power Receiver output current [mA]
o
𝐼 Primary Coil current [mA]
P
L Inductance in the impedance matching network [μH]
m
𝐿 Primary Coil self inductance [μH]
P
𝐿 Secondary Coil self inductance (Mobile Device away from Base Station) [μH]
S
′
𝐿 Secondary Coil self inductance (Mobile Device on top of Base Station) [μH]
S
𝑃 Power loss that results in heating of a Foreign Object [W]
FO
𝑃 Total amount of power received through the Interface Surface [W]
PR
𝑃 Total amount of power transmitted through the Interface Surface [W]
PT
Q Quality factor
𝑡 Power Control Hold-off Time [ms]
delay
– 15 – IEC PAS 63095-2:2017 © IEC 2017
𝑡 Communications clock period [μs]
CLK
𝑡 Maximum transition time of the communications [μs]
T
𝑉 Rectified voltage [V]
r
𝑉 Power Receiver output voltage [V]
o
1.8 Conventions
This section defines the notations and conventions used in The Qi Wireless Power Transfer System,
Power Class 0 Specification.
1.8.1 Cross references
Unless indicated otherwise, cross references to sections include the sub sections contained therein.
1.8.2 Informative text
Informative text is set in italics, unless the complete Section is marked as informative.
1.8.3 Terms in capitals
Terms having a specific meaning in the context of The Qi Wireless Power Transfer System, Power Class 0
Specification are capitalized and defined in Section 1.5.
1.8.4 Units of physical quantities
Physical quantities are expressed in units of the International System of Units.
1.8.5 Decimal separator
The decimal separator is a period.

1.8.6 Notation of numbers
 Real numbers are represented using the digits 0 to 9, a decimal point, and optionally an exponential
part. In addition, a positive and/or negative tolerance indicator may follow a real number. Real
numbers that do not include an explicit tolerance indicator, are accurate to half the least significant
digit that is specified.
+0.01
EXAMPLE A specified value of 1.23 comprises the range from 1.21 through 1.24; a specified value of
−0.02
+0.01
1.23 comprises the range from 1.23 through 1.24; a specified value of 1.23 comprises the range from
−0.02
1.21 through 1.23; a specified value of 1.23 comprises the range from 1.225 through 1.234999…; and a specified
±10%
value of 1.23 comprises the range from 1.107 through 1.353.
 Integer numbers in decimal notation are represented using the digits 0 to 9.
 Integer numbers in hexadecimal notation are represented using the hexadecimal digits 0 to 9 and A to
F, and are prefixed by “0x” unless explicitly indicated otherwise.
 Single bit values are represented using the words ZERO and ONE.
 Integer numbers in binary notation and bit patterns are represented using sequences of the digits 0
and 1, which are enclosed in single quotes (e.g. ‘01001’). In a sequence of n bits, the most significant
bit (MSB) is bit bn–1 and the least significant bit (LSB) is bit b . The most significant bit is shown on
the left-hand side.
 Numbers that are shown between parentheses are informative.
1.8.7 Bit ordering in a byte
The graphical representation of a byte is such that the most significant bit is on the left, and the least
significant bit is on the right. Figure 1 defines the bit positions in a byte.
Figure 1. Bit positions in a byte
MSB    LSB
b7 b6 b5 b4 b3 b2 b1 b0
1.8.8 Byte numbering
The bytes in a sequence of n bytes are referred to as B0, B1, …, Bn–1. Byte B0 corresponds to the first byte in
the sequence; byte Bn–1 corresponds to the last byte in the sequence. The graphical representation of a
byte sequence is such that B is at the upper left-hand side, and byte B is at the lower right-hand side.
0 n–1
– 17 – IEC PAS 63095-2:2017 © IEC 2017
1.8.9 Multiple-bit fields
Multiple-bit fields are used in the ID Packet. Unless indicated otherwise, a multiple-bit field in a data
structure represents an unsigned integer value. In a multiple-bit field that spans multiple bytes, the MSB
of the multiple-bit field is located in the byte with the lowest address, and the LSB of the multiple-bit field
is located in the byte with the highest address.
NOTE Figure 2 provides an example of a 6-bit field that spans two bytes.
Figure 2. Example of multiple-bit field
b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

B B
0 1
1.9 Operators
This section defines less-commonly used operators that are used in The Qi Wireless Power Transfer
System, Power Class 0 Specification. The commonly used operators have their usual meaning.
1.9.1 Exclusive-OR
The symbol ‘’ represents the exclusive-OR operation.
1.9.2 Concatenation
The symbol ‘||’ represents the concatenation of two bit strings. In the resulting concatenated bit string,
the MSB of the right-hand side operand directly follows the LSB of the left-hand side operand.
1.10 Measurement equipment
All measurements shall be performed using equipment that has a resolution of at least one quarter of the
precision of the quantity that is to be measured, unless indicated otherwise.
EXAMPLE “t =15 ms” means that the equipment shall be precise to 0.25 ms.
start
2 Power Transmitter reference designs
2.1 Introduction
The Power Transmitter designs that are defined in this Part 4: Reference Designs, are grouped in two basic
types.
Type A Power Transmitter designs have one or more Primary Coils. They activate a single Primary Coil at
a time and therefore employ a single Primary Cell that coincides with the activated Primary Coil. In
addition, type A Power Transmitter designs include means to realize proper alignment of the Primary Coil
and Secondary Coil. Depending on this means, a type A Power Transmitter enables either Guided
Positioning or Free Positioning.
Type B Power Transmitter designs have an array of Primary Coils. All type B Power Transmitters enable
Free Positioning. For that purpose, type B Power Transmitters can activate one or more Primary Coils
from the array to realize a Primary Cell at different positions across the Interface Surface.
A Power Transmitter serves only one Power Receiver at a time only. However, a Base Station may contain
several Power Transmitters in order to serve multiple Mobile Devices simultaneously. Note that multiple
type B Power Transmitters may share (parts of) the multiplexer and array of Primary Coils (see Section
3.3.1.3).
NOTE Power Receivers that use thin magnetic Shielding have been found to experience reduced performance on
Power Transmitters that contain a permanent magnet in or near the Active Area. Such Power Receivers may exhibit,
for example, less positioning freedom and/or a longer charging time. For this reason Power Transmitter designs A1,
A5, and A9 have been deprecated as of version 1.2 of the Qi Power Class 0 Specification.
The remaining Power Transmitter designs provided in this
...