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System Description |
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Wireless Power Transfer |
Power Transmitter Designs |
Version 1.1 Addendum A10 |
2.1.1.2Electrical details
As shown in Figure 2-4, Power Transmitter design A10 uses a half-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 |
nF. The input voltage to the half-bridge inverter is |
V. (Informative) Near |
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resonance, the voltage developed across the series capacitance can reach levels exceeding 200 V pk-pk.
Power Transmitter design A10 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 half-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 A10 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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for fop in the 175…205 kHz range; |
or better. In addition, a type A10 Power Transmitter shall control the duty cycle of the Power Signal with a resolution of 0.1% or better.
When a type A10 Power Transmitter first applies a Power Signal (Digital Ping; see [Part 1] 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 A10 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.
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LP
Figure 2-4: Electrical diagram (outline) of Power Transmitter design A10
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© Wireless Power Consortium, May 2012 |
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Wireless Power Transfer |
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Version 1.1 Addendum A10 |
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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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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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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 A10 |
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 A11
May 2012
System Description
Wireless Power Transfer
Version 1.1 Addendum A11
System Description
Wireless Power Transfer
Volume I: Low Power
Part 1: Interface Definition
Version 1.1 Addendum A11
May 2012
© Wireless Power Consortium, May 2012
System Description
Wireless Power Transfer
Version 1.1 Addendum A11
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, May 2012
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System Description |
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Wireless Power Transfer |
Version 1.1 Addendum A11 |
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 A11............................................................................................................................... |
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© Wireless Power Consortium, May 2012 |
i |
System Description |
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Wireless Power Transfer |
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Table of Contents |
Version 1.1 Addendum A11 |
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 A11....................................................................... |
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Figure 2-2: Primary Coil of Power Transmitter design A11.................................................................................................. |
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Figure 2-3: Primary Coil assembly of Power Transmitter design A11 ............................................................................. |
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Figure 2-4: Electrical diagram (outline) of Power Transmitter design A11 .................................................................. |
8 |
ii |
© Wireless Power Consortium, May 2012 |
System Description |
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Wireless Power Transfer |
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Version 1.1 Addendum A11 |
Table of Contents |
List of Tables |
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Table 2-1: Primary Coil parameters of Power Transmitter design A11 |
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Table 2-2: PID parameters for Operating Frequency control............................................................................................... |
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Table 2-3: Operating Frequency dependent scaling factor.................................................................................................... |
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Table 2-4: PID parameters for duty cycle control ...................................................................................................................... |
9 |
© Wireless Power Consortium, May 2012 |
iii |
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System Description |
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Wireless Power Transfer |
Table of Contents |
Version 1.1 Addendum A11 |
This page is intentionally left blank.
iv |
© Wireless Power Consortium, May 2012 |