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Registered Member #4465
Joined: Wed Apr 18 2012, 08:37AM
Location: Bucharest, Romania
Posts: 145
This project consists of a single-channel transmitter and power supply side receiver and associated magnetics. The project implement a method of contactless power transfer from a Base Station to a Mobile Device, which is based on near field magnetic induction between coils.
I have followed the Texas Instruments recommended application design. The transmitter system use the following sub modules: Power Transmitter Manager (bq500410)
Buck regulator + Low Power Supervisor (TPS54231 + MSP430G2101)
RF Power amplifiers (TPS28225 + TS5A1066 + CDS17308)
The transmitter requires single 12-V at 0.5 a power supply to operate. Receiver output voltage of 5 V up to 1 A, so the the transmitter may delivers 5 Watt power into. The LEDs indicates power transfer state and buzzer indicates start of power transfer. The circuit operation at frequencies in the 100…205 kHz range. The bq500410 use a simple communications protocol enabling the Mobile Device to take full control of the power transfer. By using three coils the circuit support arbitrary placement of the Mobile Device on the surface of a Base Station that can provide power through any location of that surface. Very low stand-by power achievable by using the MSP430G2101 as Low Power Supervisor (standby power of <90mW).
Registered Member #4465
Joined: Wed Apr 18 2012, 08:37AM
Location: Bucharest, Romania
Posts: 145
The bq500410A is a WPC compliant digital wireless power controller, (actually is WPC 1.1) that integrates all functions required to control wireless power transfer to any Qi-compliant receivers. Thanks, the title has been changed in order to contain these details.
Registered Member #4465
Joined: Wed Apr 18 2012, 08:37AM
Location: Bucharest, Romania
Posts: 145
This power transmitter use the WPC design A6 and contains three primary coils. In order to achieve higher system efficiency, the transmitter system detect a best coupling case between receiver coil and any transmitter coils in the array, and selecting the appropriate coil based on the perceived strength of the coupling. The overlapping scheme guarantees that there are not ‘dead spots’ in the defined area. This is meant to ensure that a device can be placed anywhere on the defined area and it will start to charge. For the moment I have prepared some individual coils in order to do some tests.
Later on I will change the layout for a dedicated three coils design setup.
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Building a Wireless Power Transmitter base for Qi compliance
