Re: Interesting inductor

john larkin <jl@650pot.com> wrote:

On Wed, 13 Mar 2024 22:32:27 +0000, Clive Arthur
<clive@nowaytoday.co.uk> wrote:
 

On 13/03/2024 04:18, John Larkin wrote:
 
<snip>
 

I'm hassling with inductors now too, but at the other end of the speed
spectrum.
 
We want a programmable inductor, from maybe 1 mH to 500 mH or so,
maybe 100 mA. Sounds like an inductive DAC, a series string of
inductors with shorting relays. If the step inductance ratio were,
say, 1.8:1 we could have some hidden bits, more than the customer
sees, so we could get pretty close to his requested value.
 
We could test all 2^n steps, make a list, and select the closest to
his request.
 
We're simulating loads to an engine control computer, torque motors
and solenoids and steppers.
 

 
Gyrator?

 
We just yesterday had a brainstorm session about that. How can one
make a programmable electronic fake inductor?
 
A real inductor stores energy, and can do things like high voltage
flyback. So a fake inductor should store energy, or pretend to. It
could be done with a current shunt, a fast ADC, some math in an FPGA,
a fast DAC, and a big power amplifier with big power supplies. Too
much work.
 
 

I wonder if you could reduce the power supply needs a bit by switchmoding
the incoming current into big storage capacitors so the gyrator does some
energy storage and could make flybacks up to some limit?

--
piglet