I believe, the coil must be driven at its parallel resonance frequency. This means the oszillating resonance current in the coil can be much larger than the source current. This should produce a much stronger magnetic field. So a coil with high inner capacity, wound from thin foil, not from wire, should work best.
Dear Peter, the wireless power transfer technology is based on resonant circuit. If the capacity is too high, you can't drive at a higher frequency. Regards, Lorandt
@@wuerthelektronik Thank you for the answer. I am not a professional, but I find this technology interesting. It was my idea, because the energy transmission is in the near field and not in the far field, very high frequency should not be required, but high idle current in the sender coil (which acts like a resonant tank circuit) is required. Lower frequency and thus lower impedance of the coil should increase the reactive wattless current and magnetic field and so increase the reach. This is just a speculation of mine, maybe this would increase ohmic losses too much. I am rather sure your engineers worked harder on this than I can ever do and know more. Maybe I am wrong with this idea.
@@hpeterh Dear Peter, first of all must be EMC compliant, second if the freq are higher, this will generate higher core losses. This is the reason to use max 205KHz freq. Additional there is a Qi-Standard consortium where many manufacturer working on a common agreement to be compatible to each other. If you want to know more I would recommend to visit this website: www.we-online.de/web/en/electronic_components/produkte_pb/demoboards/wireless_power/wireless_power_1.php There is also a book released about WPT which you can order from our sales team. Kind regards, Lorandt
Thanks! It's indeed a highly interesting technology for Würth Elektronik. More information about what we do in this case: bit.ly/1gNMIfl! Best regards, Würth Elektronik
I believe, the coil must be driven at its parallel resonance frequency. This means the oszillating resonance current in the coil can be much larger than the source current. This should produce a much stronger magnetic field. So a coil with high inner capacity, wound from thin foil, not from wire, should work best.
Dear Peter, the wireless power transfer technology is based on resonant circuit. If the capacity is too high, you can't drive at a higher frequency. Regards, Lorandt
@@wuerthelektronik Thank you for the answer. I am not a professional, but I find this technology interesting.
It was my idea, because the energy transmission is in the near field and not in the far field, very high frequency should not be required, but high idle current in the sender coil (which acts like a resonant tank circuit) is required. Lower frequency and thus lower impedance of the coil should increase the reactive wattless current and magnetic field and so increase the reach.
This is just a speculation of mine, maybe this would increase ohmic losses too much.
I am rather sure your engineers worked harder on this than I can ever do and know more. Maybe I am wrong with this idea.
@@hpeterh Dear Peter, first of all must be EMC compliant, second if the freq are higher, this will generate higher core losses. This is the reason to use max 205KHz freq.
Additional there is a Qi-Standard consortium where many manufacturer working on a common agreement to be compatible to each other. If you want to know more I would recommend to visit this website:
www.we-online.de/web/en/electronic_components/produkte_pb/demoboards/wireless_power/wireless_power_1.php
There is also a book released about WPT which you can order from our sales team.
Kind regards, Lorandt
@@wuerthelektronik Thank You very much!
@@hpeterh do you have any reference on resonant transmission ,pleas help me if you have ,am working on this project
good
Thanks! It's indeed a highly interesting technology for Würth Elektronik. More information about what we do in this case: bit.ly/1gNMIfl! Best regards, Würth Elektronik