- May 11, 2008
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For those interested :
Well, it is surprisingly simple once you read the datasheets and application notes of IDT. But the issue can be the Foreign Object Detection (FOD), although application notes are available from IDT. The P9025AC from IDT integrates a complete charger with synchronous rectifying in a single chip. It can deliver a maximum of 1A at 5V. Although cooling might be required.
The synchronous rectifying is a nice feature by using four mosfets in a bridge. Instead of using regular diodes, the diodes commonly seen integrated into mosfets are used initially and then the ic start switching the mosfets on and off at the right times of the AC sinus to synchronous rectify the AC voltage into a DC voltage.
This seriously reduces dissipation commonly seen in diode bridges.
www.idt.com/products/power-manageme...ac-5w-qi-compliant-wireless-power-receiver-ic
Idt has nice application notes on how to handle the FOD settings.
The P9025AC comes with preprogrammed FOD settings that can be chosen by selecting the right resistor value.
WURTH elektronik has great ready to use coils specially designed for this purpose.
For example the 760308103205 :
http://katalog.we-online.de/en/pbs/...08103205&_ga=1.189049827.972591133.1448047371
The sad part is that the ic is available only in a QFN package.
So an adaptor ic or a designed pcb or a evaluation kit might be needed to get it working. But it is a complete solution.
Well, it is surprisingly simple once you read the datasheets and application notes of IDT. But the issue can be the Foreign Object Detection (FOD), although application notes are available from IDT. The P9025AC from IDT integrates a complete charger with synchronous rectifying in a single chip. It can deliver a maximum of 1A at 5V. Although cooling might be required.
The synchronous rectifying is a nice feature by using four mosfets in a bridge. Instead of using regular diodes, the diodes commonly seen integrated into mosfets are used initially and then the ic start switching the mosfets on and off at the right times of the AC sinus to synchronous rectify the AC voltage into a DC voltage.
This seriously reduces dissipation commonly seen in diode bridges.
www.idt.com/products/power-manageme...ac-5w-qi-compliant-wireless-power-receiver-ic
Idt has nice application notes on how to handle the FOD settings.
The P9025AC comes with preprogrammed FOD settings that can be chosen by selecting the right resistor value.
WURTH elektronik has great ready to use coils specially designed for this purpose.
For example the 760308103205 :
http://katalog.we-online.de/en/pbs/...08103205&_ga=1.189049827.972591133.1448047371
The sad part is that the ic is available only in a QFN package.
So an adaptor ic or a designed pcb or a evaluation kit might be needed to get it working. But it is a complete solution.
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