Hello, I'm looking for information. I'd like to create PCB (A) with circular or square "coils" on the copper, from which an inch away, a second PCB (B) with similar coil(s), can induce enough current into (A) to raise a microcontroller pin to a logic-high state (1.8v.)
This seems like it shouldn't be too difficult, as the power radiated need only be very little - just enough to rectify and charge say, a small cap / 1M pulldown resistance / Zener on PCB (A) to 1.8v. But where to begin? I haven't seen anything resembling a reference design anywhere.
How to design the coils? Rough estimates are fine. All the math I've seen is very complex and for multiple-layer coils. A calculator like this, http://www.circuits.dk/calculator_planar_coil_inductor.htm is nice, but what are the calculated units? Micro Henries? That is nice, but how do I go from an inductance value to "this will (or will not) work?"
What rectifier diodes would be good for this type of application? I'm assuming they'd have to be fast.
Could 100kHz work, or is the megahertz range necessary? Is resonance necessary?
What driver circuit is good for PCB coils? The thread here, http://www.instructables.com/id/I-need-your-help.-INDUCTION/?lang=es shows one such "driver" idea, http://cdn.instructables.com/F29/4Z86/FOVWM4LD/F294Z86FOVWM4LD.LARGE.jpg as essentially a ZVS SMPS with an air-core transformer.
Thanks for any insight.
This seems like it shouldn't be too difficult, as the power radiated need only be very little - just enough to rectify and charge say, a small cap / 1M pulldown resistance / Zener on PCB (A) to 1.8v. But where to begin? I haven't seen anything resembling a reference design anywhere.
How to design the coils? Rough estimates are fine. All the math I've seen is very complex and for multiple-layer coils. A calculator like this, http://www.circuits.dk/calculator_planar_coil_inductor.htm is nice, but what are the calculated units? Micro Henries? That is nice, but how do I go from an inductance value to "this will (or will not) work?"
What rectifier diodes would be good for this type of application? I'm assuming they'd have to be fast.
Could 100kHz work, or is the megahertz range necessary? Is resonance necessary?
What driver circuit is good for PCB coils? The thread here, http://www.instructables.com/id/I-need-your-help.-INDUCTION/?lang=es shows one such "driver" idea, http://cdn.instructables.com/F29/4Z86/FOVWM4LD/F294Z86FOVWM4LD.LARGE.jpg as essentially a ZVS SMPS with an air-core transformer.
Thanks for any insight.