Hi all,
I am currently designing a POV (persistence of vision) display with a rotating part and a stationary part. For this it is necessary to transmit both power and data wirelessly from the stationary part to the rotating part.
I have built a resonant inductive wireless power system using a Royer oscillator. This operates at 2.22MHz and is working well. The receiver on the rotating part takes the RF from the LC tank circuit and feeds it into a bridge rectifier to produce about 30 volts DC, then into a smoothing cap and a voltage regulator to make a usable 5 volts DC at an amp or so.
Now then, what I want to do is switch the transmitter circuit using a MOSFET in order to transmit data, in other words modulating the 2.22MHz carrier with a square wave, let's say at a purely arbitrary speed of 50khz. I can do that bit - it's on the receiver side that I'm struggling.
How can I get this signal back out at the receiver end? Obviously I can't just take a signal from right after the bridge rectifier because there is a smoothing cap which would smooth out the signal, so what can I do?
Hope this makes some sense and someone can help.
Thanks!
I am currently designing a POV (persistence of vision) display with a rotating part and a stationary part. For this it is necessary to transmit both power and data wirelessly from the stationary part to the rotating part.
I have built a resonant inductive wireless power system using a Royer oscillator. This operates at 2.22MHz and is working well. The receiver on the rotating part takes the RF from the LC tank circuit and feeds it into a bridge rectifier to produce about 30 volts DC, then into a smoothing cap and a voltage regulator to make a usable 5 volts DC at an amp or so.
Now then, what I want to do is switch the transmitter circuit using a MOSFET in order to transmit data, in other words modulating the 2.22MHz carrier with a square wave, let's say at a purely arbitrary speed of 50khz. I can do that bit - it's on the receiver side that I'm struggling.
How can I get this signal back out at the receiver end? Obviously I can't just take a signal from right after the bridge rectifier because there is a smoothing cap which would smooth out the signal, so what can I do?
Hope this makes some sense and someone can help.
Thanks!