Freescale Semiconductor
User Guide
Document Number:LPWPRUG
Rev. 0, 11/2012
Low Power Wireless Power
Receiver
Contents
1 Introduction
This document describes the basic steps for getting started
with the wireless charger receiver reference design Rev1.2.
Basic board functions are described in this document.
Freescale provides a low power wireless charger solution
(transmitter and receiver) that is compliant with WPC Qi
V1.0.2 specification.
1
Introduction................................................................1
2
Reference Board Features.........................................1
2.1
Reference board block diagram. ....................2
2.2
Modules explanation......................................3
2.3
Boards input and output..................................4
2.4
Software Developing
Environment...................................................5
2 Reference Board Features
The wireless power receiver demo board Rev1.2 includes the
following features:
• Compliance with WPC Qi V1.0.2 low power (5 W)
standard
• Input power (5~20 Vac peak) from the transmitter via
the Rx coil
• Output power 5 W (5 V at 1 A) capability
• Communication with the transmitter with a 2 Kbps biphase signal. Quick dynamic response to load the
change through a control error signal fed back to the
transmitter in real time
• Output disconnection function
• System input/output voltage, current and temperature
out-of-range protection
© 2012 Freescale Semiconductor, Inc.
2.5
2.6
2.4.1
MCU debugger – P&E
Multilink..........................................5
2.4.2
Software developing IDE
— CodeWarrior................................6
2.4.3
Software configuration tool
– processor expert............................6
2.4.4
Run-time debugging tool –
Freemaster.......................................7
How to Test...................................................8
2.5.1
Test points........................................8
2.5.2
Measurements...............................10
References...................................................11
Reference Board Features
• Small PCB size (32 mm x 18 mm x 2 mm). Can be fitted into the back sleeve of mobiles
• Optimal power efficiency
B1 – type transmitter and primary coil
Receiver and secondary coil
Figure 1. Freescale low power wireless receiver/transmitter in working
2.1 Reference board block diagram
The Rx Rev1.2 design block diagram is shown in Figure 2.
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Reference Board Features
Figure 2. Reference board block diagram Rev 1.2
2.2 Modules explanation
Freescale
MC9RS08KB12 MCU
AC/DC Rectifier and
communication circuit
DC-DC converter and output
disconnection circuit
Figure 3. Board overview
MCU
The Freescale MC9RS08KB12 microcontroller is used to monitor and calibrate system input/output power, control the output
connection, or disconnection.
The followings MCU modules are used in this application:
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Reference Board Features
• Modulo Timer (MTIM) for communication and timing control
• 10 bits ADC for voltage/current sampling
• GPIO for output disconnection on/off
Rectifier
The rectifier uses self-driven sync type. Its characteristics are:
• Input voltage — 5 – 20 Vac peak
• Output voltage — 5 – 20 Vdc
Communication
Differential bi-phase signal is modulated by switching modulation capacitor.
DC-DC converter
• Input voltage — 5~20 Vdc
• Output voltage — 5 Vdc/1000mA
2.3 Boards input and output
AC Input—Connect to Rx coil
DC Output—Connect to loading
–
+
Figure 4. Board input and output
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Reference Board Features
2.4 Software Developing Environment
This chapter demonstrates the software developing environment.
2.4.1 MCU debugger – P&E Multilink
Debugging the target board through the P&E Multilink debugger
Freemaster for run-time debugging
P&E Multilink
debugger
6 pins to 4 pins convert cable
Wireless power receiver target board
Figure 5. SW developing environment
Connector for PE Multilink BDM Debugger
To connect the BDM debugger with the target board, a connector for 6 pins to 4 pins is needed.
Connect the board as Figure 6 indicates.
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Reference Board Features
Figure 6. 6 pin to 4-pin connector for the BDM debug cable
2.4.2 Software developing IDE — CodeWarrior
For the Freescale MC9RS08KB12 MCU, software (SW) compiling and debugging is in CodeWarrior V6.3.
Figure 7. Freescale MC9RS08KB12 MCU developing IDE – CodeWarrior V6.3
2.4.3 Software configuration tool – processor expert
For MCU resource management and input /output (I/O) driver developping, Freescale provides a Processor Expert GUI tool
for the reference design. The tool is integrated in CodeWarrior and can generate low level I/O drivers and initialization codes
automatically. A customer can change hardware (HW) configurations using this tool.
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Reference Board Features
Figure 8. SW configuration tool – processor xxpert
2.4.4 Run-time debugging tool – Freemaster
For system run-time debugging and configuration, Freescale provides the Freemaster tool. You can read or write RAM data
for testing, watch the real-time data curve to know system operation status, and record the data curve to a text file with time
stamp for debugging.
Figure 9. Run-time debugging tool – Freemaster through P&E Multilink debugger
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Reference Board Features
Setting -up Freemaster before connecting to the target
Set debugging interface:
P&E BDM
Select which P&E BDM debugger
connects to the board
Set the binary file
or symbol mapping
Figure 10. Setting Freemaster option
2.5 How to Test
This chapter is about testing.
2.5.1 Test points
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Reference Board Features
Main test points on the receiver board are shown in the figures below.
DC output
MCU 3.3 v Vcc
AC input
–
+
Communication signal
Rectifier DC output voltage
Figure 11. Test Points on Wireless Power Receiver Board Rev1.2
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Reference Board Features
Output 5 V / 1A
+
MCU Debugging pins — Reset-BKGD-Vcc_GND
–
Figure 12. Debugging Pins on the back of the Board
2.5.2 Measurements
Here are several examples that show how to measure and debug the board.
Figure 13 shows the input voltage and communication signal from ping phase to a power transfer setup.
Ch1— Rectifier DC output voltage
Ch2 — Coil AC input voltage
Ch3 — Communication signal
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Reference Board Features
Figure 13. Wireless power receiver ping process
Figure 14 shows the control error signals fed back to the power transmitter when the input voltage changes.
Ch2 —Rectifier DC output voltage
Ch3 —Communication signal
Figure 14. Control error signals response of input voltage change
2.6 References
Get more information from Freescale wireless power charger solution page:
• www.freescale.com/wirelesscharging
RS08KB MCU summary page:
• http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=RS08KB
MCU Debugger: USB BDM Multilink
• http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=USBMULTILINKBDM&fsrch=1
• http://www.pemicro.com/universal/index.cfm
SW Developing IDE: Codewarrior Rev 6.3
• http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=CW-MICROCONTROLLERS&tid=CWH
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Document Number: LPWPRUG
Rev. 0, 11/2012
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