ВУЗ: Не указан
Категория: Не указан
Дисциплина: Не указана
Добавлен: 13.04.2024
Просмотров: 348
Скачиваний: 0
|
System Description |
|
Wireless Power Transfer |
General |
Version 1.1.1 Addendum A14 |
This page is intentionally left blank.
4 |
© Wireless Power Consortium, September 2012 |
|
System Description |
|
Wireless Power Transfer |
Version 1.1.1 Addendum A14 |
Power Transmitter Designs |
2 Power Transmitter Designs
This Section contains the definition of the new Power Transmitter design A14. The provisions in this Section will be integrated into [Part 1] in a next release of this System Description Wireless Power Transfer.
2.1Power Transmitter design A14
Figure 2-1 illustrates the functional block diagram of Power Transmitter design A14, which consists of two major functional units, namely a Power Conversion Unit and a Communications and Control Unit.
Input Power
Inverter
Coil
Selection
Control &
Communications
Unit Primary
Coils
Current
Sense
Unit Conversion Power
Figure 2-1: Functional block diagram of Power Transmitter design A14
The Power Conversion Unit on the right-hand side of Figure 2-1 comprises the analog parts of the design. The inverter converts the DC input to an AC waveform that drives a resonant circuit, which consists of the selected Primary Coil plus a series capacitor. The selected Primary Coil is one from a linear array of partially overlapping Primary Coils, as appropriate for the position of the Power Receiver relative to the Primary Coils. Selection of the Primary Coil proceeds by the Power Transmitter attempting to establish communication with a Power Receiver using any of the Primary Coils. Note that the array may consist of a single Primary Coil only, in which case the selection is trivial. Finally, the current sense monitors the Primary Coil current.
The Communications and Control Unit on the left-hand side of Figure 2-1 comprises the digital logic part of the design. This unit receives and decodes messages from the Power Receiver, configures the Coil Selection block to connect the appropriate Primary Coil, executes the relevant power control algorithms and protocols, and drives the frequency of the AC waveform to control the power transfer. The Communications and Control Unit also interfaces with other subsystems of the Base Station, e.g. for user interface purposes.
2.1.1.1Mechanical details
Power Transmitter design A14 includes one or more Primary Coils as defined in Section 2.1.1.1.1, Shielding as defined in Section 2.1.1.1.2, an Interface Surface as defined in Section 2.1.1.1.3.
© Wireless Power Consortium, September 2012 |
5 |
|
System Description |
|
Wireless Power Transfer |
Power Transmitter Designs |
Version 1.1.1 Addendum A14 |
2.1.1.1.1Primary Coil
The Primary Coil is of the wire-wound type, and consists of litz wire having 115 strands of 0.08 mm diameter, or equivalent. As shown in Figure 2-2, the Primary Coil has a racetrack-like shape and consists of a single layer. Table 2-1 lists the dimensions of the Primary Coil.
Figure 2-2: Primary Coil of Power Transmitter design A14
Table 2-1: Primary Coil parameters of Power Transmitter design A14
|
Parameter |
|
|
Symbol |
|
|
Value |
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
Outer length |
|
|
|
|
|
mm |
|
|
|
|
|
|
|
|
|
|
|
Inner length |
|
|
|
|
|
mm |
|
|
|
|
|
|
|
|
|
|
|
Outer width |
|
|
|
|
|
mm |
|
|
|
|
|
|
|
|
|
|
|
Inner width |
|
|
|
|
|
mm |
|
|
|
|
|
|
|
|
|
|
|
Thickness |
|
|
|
|
|
mm |
|
|
|
|
|
|
|
|
|
|
|
Number of turns per layer |
|
|
|
|
23.5 |
|
|
|
|
|
|
|
|
|
|
|
|
Number of layers |
|
|
– |
|
1 |
|
|
|
|
|
|
|
|
|
|
|
Power Transmitter design A14 contains two Primary Coils, which are mounted in a Shielding block (see Section 2.1.1.1.2) with their long axes coincident, and a displacement of = mm between their centers. See Figure 2-3.
Figure 2-3: Primary Coils of Power Transmitter design A14
6 |
© Wireless Power Consortium, September 2012 |
|
System Description |
|
Wireless Power Transfer |
Version 1.1.1 Addendum A14 |
Power Transmitter Designs |
2.1.1.1.2Shielding
As shown in Figure 2-4, soft-magnetic material protects the Base Station from the magnetic field that is generated in the Primary Coil. The top face of the Shielding block is aligned with the top face of the Primary Coils, such that the Shielding surrounds the Primary Coils on all sides except for the top face. In addition, the Shielding extends to at least 2.5 mm beyond the outer edge of the Primary Coils, and has a thickness of at least 4.7 mm. This version 1.1.1 Addendum A14 to the System Description Wireless Power Transfer, Volume I, Part 1, limits the composition of the Shielding to a choice from the following list of materials:
Mn-Zn-Ferrite Dust Core – any supplier
Interface
Surface
5 mm min.
dz
Primary Coil (lower) |
|
|
|
|
|
|
4.7 mm |
|
|
|
|
|
|
|
|
|
|
Base |
Primary Coil (upper) |
2.5 mm min. |
|
|
|
|
|
|
|
|
|||||||
Shielding |
|
|
|
|
|
|
|
|
Station |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Figure 2-4: Primary Coil assembly of Power Transmitter design A14
2.1.1.1.3Interface Surface
As shown in Figure 2-4, the distance from the Primary Coil to the Interface Surface of the Base Station is mm, across the top face of the Primary Coil. In addition, the Interface Surface of the Base
Station extends at least 5 mm beyond the outer edges of the Primary Coils.
2.1.1.1.4Inter coil separation
If the Base Station contains multiple type A14 Power Transmitters, the Primary Coils of any pair of those Power Transmitters shall have a center-to-center distance of at least 70 mm.
2.1.1.2Electrical details
As shown in Figure 2-5, Power Transmitter design A14 uses a full-bridge inverter to drive the Primary Coils and a series capacitance. In addition, Power Transmitter design A14 shall operate coil selection switches SWu and SWl such that only a single Primary Coil is connected to the inverter.
Within the Operating Frequency range Specified below, the assembly of Primary Coils and Shielding has a
self inductance |
μH. |
The value of the series capacitance is |
nF. The input voltage |
to the full-bridge inverter is |
V. (Informative) Near resonance, the voltage developed across the |
||
series capacitance can reach levels up to 100 Vpk-pk. |
|
||
Power Transmitter design A14 uses the Operating Frequency and duty cycle of the full-bridge inverter 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 2…50% at
an Operating Frequency of 110…205 kHz. A higher Operating Frequency and lower duty cycle result in the transfer of a lower amount of power. In order to achieve a sufficiently accurate adjustment of the power that is transferred, a type A14 Power Transmitter shall be able to control the frequency with a resolution of 0.5 kHz or better, and the duty cycle of the Power Signal with a resolution of 0.1% or better.
When a type A14 Power Transmitter first applies a Power Signal (Digital Ping; see [Part 1] Section 5.2.1), the Power Transmitter shall use an initial Operating Frequency of 142 kHz, and a duty cycle of 50%. If the
© Wireless Power Consortium, September 2012 |
7 |
|
System Description |
|
Wireless Power Transfer |
Power Transmitter Designs |
Version 1.1.1 Addendum A14 |
Power Transmitter does not to receive a Signal Strength Packet from the Power Receiver, the Power Transmitter shall remove the Power Signal as defined in [Part 1], Section 5.2.1. The Power Transmitter may reapply the Power Signal multiple times at other-consecutively lower-Operating Frequencies within the range specified above, until the Power Transmitter receives a Signal Strength Packet containing an appropriate Signal Strength Value.
Full-bridge
Inverter
Input
Voltage + Control
‒
CP
LPu
LPl
SWu SWl
Figure 2-5: Electrical diagram (outline) of Power Transmitter design A14
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 Operating Frequency or duty cycle. In order to guarantee sufficiently accurate power control, a type A14 Power Transmitter shall determine the amplitude of the Primary Cell current-which is equal to the Primary Coil current-with a resolution of 5mA or better. Finally, Table 2-2 and Table 2-3 provide the values of several parameters, which are used in the PID algorithm.
8 |
© Wireless Power Consortium, September 2012 |
|
|
|
System Description |
|
|
|
|
|
|
||||
|
|
|
Wireless Power Transfer |
|
|
|
|
|
|
||||
Version 1.1.1 Addendum A14 |
|
|
|
|
|
|
|
Power Transmitter Designs |
|||||
|
|
Table 2-2: PID parameters for Operating Frequency control |
|||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Parameter |
|
|
Symbol |
|
|
Value |
|
|
Unit |
|
|
|
|
Proportional gain |
|
|
|
|
|
1 |
|
|
mA-1 |
|
|
|
|
Integral gain |
|
|
|
|
|
0 |
|
|
mA-1ms-1 |
|
|
|
|
Derivative gain |
|
|
|
|
|
0 |
|
|
mA-1ms |
|
|
|
|
Integral term limit |
|
|
|
|
|
N.A. |
|
|
N.A. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
PID output limit |
|
|
|
|
|
20,000 |
|
|
N.A. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Scaling factor |
|
|
|
|
|
1.0 |
|
|
Hz |
|
|
|
|
|
|
|
|
|
|
|
|
||||
|
|
Table 2-3: PID parameters for duty cycle control |
|
|
|
|
|
||||||
|
|
|
|
|
|
|
|
|
|
||||
|
|
Parameter |
|
|
Symbol |
|
|
Value |
|
|
Unit |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Proportional gain |
|
|
|
|
|
1 |
|
|
mA-1 |
|
|
|
|
Integral gain |
|
|
|
|
|
0 |
|
|
mA-1ms-1 |
|
|
|
|
Derivative gain |
|
|
|
|
|
0 |
|
|
mA-1ms |
|
|
|
|
Integral term limit |
|
|
|
|
|
N.A |
|
|
N.A. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
PID output limit |
|
|
|
|
|
20,000 |
|
|
N.A. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Scaling factor |
|
|
|
|
|
0.1 |
|
% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
© Wireless Power Consortium, September 2012 |
9 |
|
System Description |
|
Wireless Power Transfer |
Power Transmitter Designs |
Version 1.1.1 Addendum A14 |
This page is intentionally left blank.
10 |
© Wireless Power Consortium, September 2012 |
System Description
Wireless Power Transfer
Volume I: Low Power
Part 1: Interface Definition
Version 1.1 Addendum B4
May 2012
System Description
Wireless Power Transfer
Version 1.1 Addendum B4
System Description
Wireless Power Transfer
Volume I: Low Power
Part 1: Interface Definition
Version 1.1 Addendum B4
May 2012
© Wireless Power Consortium, May 2012
System Description
Wireless Power Transfer
Version 1.1 Addendum B4
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
|
System Description |
|
Wireless Power Transfer |
Version 1.1 Addendum B4 |
Table of Contents |
Table of Contents
1 |
General................................................................................................................... |
1 |
||
|
1.1 |
Scope............................................................................................................................................................................................. |
1 |
|
|
1.2 |
Conformance and references ............................................................................................................................................. |
1 |
|
|
1.3 |
Definitions .................................................................................................................................................................................. |
1 |
|
|
1.4 |
Acronyms .................................................................................................................................................................................... |
1 |
|
|
1.5 |
Symbols........................................................................................................................................................................................ |
1 |
|
|
1.6 |
Conventions ............................................................................................................................................................................... |
2 |
|
|
1.6.1 |
Cross references ............................................................................................................................................................ |
2 |
|
|
1.6.2 |
Informative text............................................................................................................................................................. |
2 |
|
|
1.6.3 |
Terms in capitals........................................................................................................................................................... |
2 |
|
|
1.6.4 |
Notation of numbers.................................................................................................................................................... |
2 |
|
|
1.6.5 Units of physical quantities ...................................................................................................................................... |
2 |
||
|
1.6.6 Bit ordering in a byte................................................................................................................................................... |
2 |
||
|
1.6.7 |
Byte numbering ............................................................................................................................................................. |
2 |
|
|
1.6.8 |
Multiple-bit Fields......................................................................................................................................................... |
2 |
|
|
1.7 |
Operators .................................................................................................................................................................................... |
3 |
|
|
1.7.1 |
Exclusive-OR ................................................................................................................................................................... |
3 |
|
|
1.7.2 |
Concatenation................................................................................................................................................................. |
3 |
|
2 |
Power Transmitter Designs............................................................................ |
5 |
||
|
2.1.1 Power Transmitter design B4 ................................................................................................................................. |
5 |
||
© Wireless Power Consortium, May 2012 |
i |