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System Description |
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Wireless Power Transfer |
Power Transmitter Designs |
Version 1.1 Addendum A11 |
2.1.1.2Electrical details
As shown in Figure 2-4, Power Transmitter design A11 uses a full-bridge inverter to drive the Primary Coil and a series capacitance. Within the Operating Frequency range specified below, the assembly of
Primary Coil, Shielding, and magnet has a self inductance |
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The value of the series |
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capacitance is |
μF. The input voltage to the full-bridge inverter is |
V. (Informative) Near |
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resonance, the voltage developed across the series capacitance can reach levels exceeding 100 V pk-pk.
Power Transmitter design A11 uses the Operating Frequency and duty cycle of the Power Signal in order to control the amount of power that is transferred. For this purpose, the Operating Frequency range of the full-bridge inverter is kHz with a duty cycle of 50%; and its duty cycle range is 10…50%
at an Operating Frequency of 205 kHz. A higher Operating Frequency or lower duty cycle result in the transfer of a lower amount of power. In order to achieve a sufficiently accurate adjustment of the amount of power that is transferred, a type A5 Power Transmitter shall control the Operating Frequency with a resolution of
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for fop in the 110…175 kHz range; |
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kHz, |
for fop in the 175…205 kHz range; |
or better. In addition, a type A5 Power Transmitter shall control the duty cycle of the Power Signal with a resolution of 0.1% or better.
When a type A11 Power Transmitter first applies a Power Signal (Digital Ping; see Section 5.2.1), it shall use an initial Operating Frequency of 175 kHz (and a duty cycle of 50%).
Control of the power transfer shall proceed using the PID algorithm, which is defined in [Part 1], Section 5.2.3.1. The controlled variable ( ) introduced in the definition of that algorithm represents the Operating Frequency or the duty cycle. In order to guarantee sufficiently accurate power control, a type A11 Power Transmitter shall determine the amplitude of the Primary Cell current—which is equal to the Primary Coil current—with a resolution of 7 mA or better. Finally, Table 2-2, Table 2-3, and Table 2-4 provide the values of several parameters, which are used in the PID algorithm.
Full-bridge
Inverter
Input
Voltage + Control
‒
CP |
LP |
Figure 2-4: Electrical diagram (outline) of Power Transmitter design A11
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© Wireless Power Consortium, May 2012 |
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Wireless Power Transfer |
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Version 1.1 Addendum A11 |
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Power Transmitter Designs |
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Table 2-2: PID parameters for Operating Frequency control |
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Parameter |
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Proportional gain |
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mA-1 |
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Integral gain |
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0.05 |
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Derivative gain |
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Integral term limit |
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3,000 |
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PID output limit |
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20,000 |
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Table 2-3: Operating Frequency dependent scaling factor |
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Frequency Range [kHz] |
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Scaling Factor |
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110…140 |
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140…160 |
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160…180 |
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180…205 |
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Table 2-4: PID parameters for duty cycle control |
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Parameter |
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Proportional gain |
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mA-1 |
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Integral gain |
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0.05 |
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Derivative gain |
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mA-1ms |
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Integral term limit |
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3,000 |
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PID output limit |
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20,000 |
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Scaling factor |
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© Wireless Power Consortium, May 2012 |
9 |
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System Description |
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Wireless Power Transfer |
Power Transmitter Designs |
Version 1.1 Addendum A11 |
This page is intentionally left blank.
10 |
© Wireless Power Consortium, May 2012 |
System Description
Wireless Power Transfer
Volume I: Low Power
Part 1: Interface Definition
Version 1.1 Addendum A12
July 2012
System Description
Wireless Power Transfer
Version 1.1 Addendum A12
System Description
Wireless Power Transfer
Volume I: Low Power
Part 1: Interface Definition
Version 1.1 Addendum A12
July 2012
© Wireless Power Consortium, July 2012
System Description
Wireless Power Transfer
Version 1.1 Addendum A12
COPYRIGHT
This System Description Wireless Power Transfer is published by the Wireless Power Consortium, and has been prepared by the Wireless Power Consortium in close co-operation with the members of the Wireless Power Consortium. All rights are reserved. Reproduction in whole or in part is prohibited without express and prior written permission of the Wireless Power Consortium.
DISCLAIMER
The information contained herein is believed to be accurate as of the date of publication. However, the Wireless Power Consortium will not be liable for any damages, including indirect or consequential, from use of this System Description Wireless Power Transfer or reliance on the accuracy of this document.
NOTICE
For any further explanation of the contents of this document, or in case of any perceived inconsistency or ambiguity of interpretation, or for any information regarding the associated patent license program, please contact: info@wirelesspowerconsortium.com.
© Wireless Power Consortium, July 2012
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System Description |
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Wireless Power Transfer |
Version 1.1 Addendum A12 |
Table of Contents |
Table of Contents
1 |
General................................................................................................................... |
1 |
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1.1 |
Scope............................................................................................................................................................................................. |
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1.2 |
Conformance and references ............................................................................................................................................. |
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1.3 |
Definitions .................................................................................................................................................................................. |
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1.4 |
Acronyms .................................................................................................................................................................................... |
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1.5 |
Symbols........................................................................................................................................................................................ |
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1.6 |
Conventions ............................................................................................................................................................................... |
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1.6.1 |
Cross references ............................................................................................................................................................ |
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1.6.2 |
Informative text............................................................................................................................................................. |
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1.6.3 |
Terms in capitals........................................................................................................................................................... |
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1.6.4 |
Notation of numbers.................................................................................................................................................... |
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1.6.5 Units of physical quantities ...................................................................................................................................... |
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1.6.6 Bit ordering in a byte................................................................................................................................................... |
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1.6.7 |
Byte numbering ............................................................................................................................................................. |
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1.6.8 |
Multiple-bit Fields......................................................................................................................................................... |
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1.7 |
Operators .................................................................................................................................................................................... |
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1.7.1 |
Exclusive-OR ................................................................................................................................................................... |
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1.7.2 |
Concatenation................................................................................................................................................................. |
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Power Transmitter Designs............................................................................ |
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2.1.1 Power Transmitter design A12............................................................................................................................... |
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© Wireless Power Consortium, July 2012 |
i |
System Description |
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Wireless Power Transfer |
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Table of Contents |
Version 1.1 Addendum A12 |
List of Figures |
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Figure 1-1: Bit positions in a byte ..................................................................................................................................................... |
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Figure 1-2: Example of multiple-bit field....................................................................................................................................... |
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Figure 2-1: Functional block diagram of Power Transmitter design A12....................................................................... |
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Figure 2-2: Primary Coil of Power Transmitter design A12.................................................................................................. |
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Figure 2-3: Electrical diagram (outline) of Power Transmitter design A12 .................................................................. |
8 |
ii |
© Wireless Power Consortium, July 2012 |
System Description |
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Wireless Power Transfer |
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Version 1.1 Addendum A12 |
Table of Contents |
List of Tables |
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Table 2-1: Primary Coil parameters of Power Transmitter design A12 |
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Table 2-2: PID parameters for Operating Frequency control............................................................................................... |
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Table 2-3: PID parameters for duty cycle control ...................................................................................................................... |
9 |
© Wireless Power Consortium, July 2012 |
iii |
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System Description |
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Wireless Power Transfer |
Table of Contents |
Version 1.1 Addendum A12 |
This page is intentionally left blank.
iv |
© Wireless Power Consortium, July 2012 |
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System Description |
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Wireless Power Transfer |
Version 1.1 Addendum A12 |
General |
1 General
1.1Scope
Volume I of the System Description Wireless Power Transfer consists of the following documents:
Part 1, Interface Definition.
Part 2, Performance Requirements.
Part 3, Compliance Testing.
This document defines the addition of a new Power Transmitter design. The material contained in this document will be integrated into Part 1 of Volume I of the System Description Wireless Power Transfer, at some later time.
1.2Conformance and references
All specifications in this document are mandatory, unless specifically indicated as recommended or optional or informative. To avoid any doubt, the word “shall” indicates a mandatory behavior of the specified component, i.e. it is a violation of this System Description Wireless Power Transfer if the specified component does not exhibit the behavior as defined. In addition, the word “should” indicates a recommended behavior of the specified component, i.e. it is not a violation of this System Description Wireless Power Transfer if the specified component has valid reasons to deviate from the defined behavior. And finally, the word “may” indicates an optional behavior of the specified component, i.e. it is up to the specified component whether to exhibit the defined behavior (without deviating there from) or not.
In addition to the specifications provided in this document, product implementations shall also conform to the specifications provided in the System Descriptions listed below. Moreover, the relevant parts of the International Standards listed below shall apply as well. If multiple revisions exist of any System Description or International Standard listed below, the applicable revision is the one that was most recently published at the release date of this document. Moreover, if there exist addendum documents to the applicable revision, such addendum documents are considered to be an integral part of that applicable revision.
[Part 1] |
System Description Wireless Power Transfer, Volume I, Part 1, Interface |
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Definition. |
[Part 2] |
System Description Wireless Power Transfer, Volume I, Part 2, Performance |
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Requirements. |
[Part 3] |
System Description Wireless Power Transfer, Volume I, Part 3, Compliance |
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Testing. |
[SI] |
The International System of Units (SI), Bureau International des Poids et |
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Mesures. |
1.3Definitions
This document introduces no new definitions to the System Description Wireless Power Transfer.
1.4Acronyms
This document introduces no new acronyms to the System Description Wireless Power Transfer.
1.5Symbols
This document introduces no new symbols to the System Description Wireless Power Transfer.
© Wireless Power Consortium, July 2012 |
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