The Qi wireless power transfer system power class 0 specification - Parts 1 and 2: Interface definitions

IEC PAS 63095-1:2017(E) defines the interface between a Power Transmitter and a Power Receiver, i.e. 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)

General Information

Status
Published
Publication Date
09-May-2017
Current Stage
PPUB - Publication issued
Completion Date
10-May-2017
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IEC PAS 63095-1
Edition 1.0 2017-05
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
colour
inside
The Qi wireless power transfer system power class 0 specification –
Parts 1 and 2: Interface Definitions
IEC PAS 63095-1:2017-05(en)
---------------------- Page: 1 ----------------------
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IEC PAS 63095-1
Edition 1.0 2017-05
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
colour
inside
The Qi wireless power transfer system power class 0 specification –
Parts 1 and 2: Interface Definitions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.99 ISBN 978-2-8322-415-5

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC PAS 63095-1:2017 © IEC 2017
WIRELESS POWER
The Qi Wireless Power Transfer System Parts 1 and 2: Interface Definitions
C O N S O R T I U M
Power Class 0 Specification
Version 1.2.2 Contents
Contents

1 General ............................................................................................................. 8

1.1 Introduction .............................................................................................................................................. 8

1.2 Scope ......................................................................................................................................................... 8

1.2.1 Current Specification structure (introduced in version 1.2.1) ........................................................... 8

1.2.2 Earlier Specification structure (version 1.2.0 and below) ................................................................. 9

1.3 Main features of the Qi Wireless Power Transfer System ........................................................................ 9

1.4 Conformance and references ................................................................................................................. 10

1.4.1 Conformance ................................................................................................................................... 10

1.4.2 References ....................................................................................................................................... 10

1.5 Definitions ............................................................................................................................................... 11

1.6 Acronyms ................................................................................................................................................ 14

1.7 Symbols ................................................................................................................................................... 16

1.8 Conventions ............................................................................................................................................ 17

1.8.1 Cross references .............................................................................................................................. 17

1.8.2 Informative text ............................................................................................................................... 17

1.8.3 Terms in capitals .............................................................................................................................. 17

1.8.4 Units of physical quantities ............................................................................................................. 17

1.8.5 Decimal separator ........................................................................................................................... 17

1.8.6 Notation of numbers ....................................................................................................................... 18

1.8.7 Bit ordering in a byte ....................................................................................................................... 18

1.8.8 Byte numbering ............................................................................................................................... 18

1.8.9 Multiple-bit fields ............................................................................................................................ 19

1.9 Operators ................................................................................................................................................ 19

1.9.1 Exclusive-OR .................................................................................................................................... 19

1.9.2 Concatenation ................................................................................................................................. 19

1.10 Measurement equipment ....................................................................................................................... 19

Wireless Power Consortium
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IEC PAS 63095-1:2017 © IEC 2017 – 3 –
WIRELESS POWER
The Qi Wireless Power Transfer System Parts 1 and 2: Interface Definitions
C O N S O R T I U M
Power Class 0 Specification
Version 1.2.2 Contents

PART 1: Primary Interface Definition ............................................ 20

2 Mechanical interface ...................................................................................... 21

2.1 Power Receiver design requirements (PRx) ............................................................................................ 21

2.1.1 Interface Surface ............................................................................................................................. 21

2.1.2 Alignment Aid .................................................................................................................................. 21

2.2 Power Transmitter design requirements (PTx) ....................................................................................... 22

3 Electromagnetic interface ............................................................................... 23

3.1 Power Receiver design requirements (PRx) ............................................................................................ 23

3.1.1 Dual resonant circuit ....................................................................................................................... 26

3.1.2 Rectification circuit .......................................................................................................................... 28

3.1.3 Sensing circuits ................................................................................................................................ 28

3.1.4 Communications modulator ............................................................................................................ 28

3.1.5 Communications demodulator ........................................................................................................ 28

3.1.6 Output disconnect ........................................................................................................................... 28

3.1.7 Meaningful functionality ................................................................................................................. 29

3.1.8 Shielding .......................................................................................................................................... 29

3.2 Power Transmitter design requirements (PTx) ....................................................................................... 30

3.2.1 Load step and load dump (informative) .......................................................................................... 30

3.2.2 Load step test procedure ................................................................................................................ 30

3.2.3 Load dump test procedure .............................................................................................................. 32

3.2.4 Power Receiver over-voltage protection ......................................................................................... 35

4 Thermal interface ........................................................................................... 42

4.1 Interface Surface temperature rise ......................................................................................................... 42

5 Information interface ...................................................................................... 43

5.1 System Control ........................................................................................................................................ 43

5.1.1 Overview (informative) ................................................................................................................... 43

5.1.2 Power Transmitter (PTx) perspective .............................................................................................. 48

5.1.3 Power Receiver (PRx) perspective ................................................................................................... 69

5.1.4 State diagram (informative) ............................................................................................................ 83

5.2 Power Receiver to Power Transmitter communications interface ......................................................... 84

5.2.1 Introduction ..................................................................................................................................... 84

5.2.2 Physical and data link layers (PRx to PTx) ........................................................................................ 84

5.2.3 Logical layer (PRx to PTx) ................................................................................................................. 89

Wireless Power Consortium
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– 4 – IEC PAS 63095-1:2017 © IEC 2017
WIRELESS POWER
The Qi Wireless Power Transfer System Parts 1 and 2: Interface Definitions
C O N S O R T I U M
Power Class 0 Specification
Version 1.2.2 Contents

5.3 Power Transmitter to Power Receiver communications interface ....................................................... 104

5.3.1 Introduction ................................................................................................................................... 104

5.3.2 Physical and data link layers (PTx to PRx) ...................................................................................... 104

5.3.3 Logical layer (PTx to PRx) ............................................................................................................... 110

PART 2: Secondary Interface Definition .......................................112

6 External Power Input (Informative) ............................................................... 113

6.1 Available power—Extended Power Profile only ................................................................................... 113

7 Power Levels—Extended Power Profile only ................................................. 114

7.1 Guaranteed Power ................................................................................................................................ 114

7.2 Light load .............................................................................................................................................. 114

8 System Efficiency (Informative) ..................................................................... 115

8.1 Definition .............................................................................................................................................. 115

8.2 Power Transmitter efficiency ................................................................................................................ 116

8.2.1 Baseline Power Profile ................................................................................................................... 116

8.2.2 Extended Power Profile ................................................................................................................. 117

8.3 Power Receiver efficiency ..................................................................................................................... 118

9 Stand-by Power (Informative) ....................................................................... 119

9.1 Transmitter Measurement Method ...................................................................................................... 119

10 Object Detection (Informative) ..................................................................... 120

10.1 Resonance shift ..................................................................................................................................... 120

10.2 Capacitance change .............................................................................................................................. 122

11 Foreign Object Detection .............................................................................. 123

11.1 Introduction .......................................................................................................................................... 123

11.2 Baseline Power Profile without FOD extensions ................................................................................... 124

11.3 FOD based on quality factor change—FOD extensions ........................................................................ 125

11.3.1 Q-factor measurement (Informative) ............................................................................................ 126

11.3.2 Expected operation (Informative) ................................................................................................. 127

11.3.3 Definition of the Reference Quality Factor ................................................................................... 128

Wireless Power Consortium
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IEC PAS 63095-1:2017 © IEC 2017 – 5 –
WIRELESS POWER
The Qi Wireless Power Transfer System Parts 1 and 2: Interface Definitions
C O N S O R T I U M
Power Class 0 Specification
Version 1.2.2 Contents

11.4 FOD based on calibrated power loss accounting—FOD extensions ..................................................... 129

11.4.1 Introduction ................................................................................................................................... 129

11.4.2 Received Power accuracy .............................................................................................................. 131

11.4.3 Calibration ..................................................................................................................................... 132

11.5 FOD by Power Receiver (Informative) .................................................................................................. 135

12 Unintentional Magnetic Field Susceptibility (Informative) ............................. 136

12.1 Limits ..................................................................................................................................................... 136

12.2 Protection ............................................................................................................................................. 136

12.3 Power Transmitter detection ................................................................................................................ 136

13 User Interface ............................................................................................... 137

13.1 User interaction with a Base Station .................................................................................................... 137

13.2 User interaction with a Mobile Device ................................................................................................. 138

Annex A EMC Standards and Regulations (informative) ................................... 139

A.1 EMC ....................................................................................................................................................... 139

A.1.1 Regulatory obligation .................................................................................................................... 139

A.1.2 Product category ........................................................................................................................... 139

A.1.3 Applicable standards ..................................................................................................................... 139

A.2 User Exposure to Magnetic Fields (informative) .................................................................................. 140

A.2.1 Introduction ................................................................................................................................... 140

A.2.2 Applicable standards ..................................................................................................................... 140

A.2.3 Measurement method .................................................................................................................. 141

A.2.4 Limits (reference levels) ................................................................................................................ 141

A.2.5 Intended use .................................................................................................................................. 145

A.2.6 Application notes ........................................................................................................................... 145

Annex B Power Receiver Localization (Informative) ......................................... 146

B.1 Guided Positioning ................................................................................................................................ 146

B.2 Primary Coil array based Free Positioning ............................................................................................ 146

B.2.1 A single Power Receiver covering multiple Primary Cells.............................................................. 146

B.2.2 Two Power Receivers covering two adjacent Primary Cells .......................................................... 147

B.2.3 Two Power Receivers covering a single Primary Cell .................................................................... 148

B.3 Moving Primary Coil based Free Positioning ........................................................................................ 149

Wireless Power Consortium
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– 6 – IEC PAS 63095-1:2017 © IEC 2017
WIRELESS POWER
The Qi Wireless Power Transfer System Parts 1 and 2: Interface Definitions
C O N S O R T I U M
Power Class 0 Specification
Version 1.2.2 Contents

B.4 User-assisted positioning ...................................................................................................................... 151

B.4.1 Example 1 ...................................................................................................................................... 151

B.4.2 Example 2 ...................................................................................................................................... 153

Annex C Power Receiver design guidelines (informative)................................. 154

C.1 Large-signal resonance check ............................................................................................................... 154

C.2 Power Receiver coil design ................................................................................................................... 155

Annex D Mechanical Design Guidelines (Informative) ...................................... 156

D.1 Base Station .......................................................................................................................................... 156

D.2 Mobile Device ....................................................................................................................................... 156

D.3 Base Station Alignment Aid ................................................................................................................... 157

D.4 Mobile Device Alignment Aid ............................................................................................................... 157

Annex E History of Changes ............................................................................. 158

Wireless Power Consortium
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IEC PAS 63095-1:2017 © IEC 2017 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
THE QI WIRELESS POWER TRANSFER SYSTEM
POWER CLASS 0 SPECIFICATION –
Parts 1 and 2: Interface Definitions
FOREWORD

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A PAS is a technical specification not fulfilling the requirements for a standard, but made

available to the public.

IEC PAS 63095-1 has been processed by subcommittee 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
100/2826/PAS 100/2864/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.

This PAS shall remain valid for an initial maximum period of 3 years starting from the

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shall be withdrawn.
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– 8 – IEC PAS 63095-1:2017 © IEC 2017
WIRELESS POWER
The Qi Wireless Power Transfer System Parts 1 and 2: Interface Definitions
C O N S O R T I U M
Power Class 0
Version 1.2.2 General
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,

designated Power Class 0, 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, Parts 1 and 2: Interface Definitions, defines the interface between a Power Transmitter

and a Power Receiver, i.e. 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 (this document)
 Part 1: Primary Interface Definition
 Part 2: Secondary Interface Definition
 Part 3: Compliance Testing
 Part 4: Reference Designs

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

...

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