I have shown a block diagram in which the odd and even taps are connected together, respectively. The switch shown is of roller type, one of which connects through the odd taps and the other through the even. There is overlapping between even and odd taps. I need to sense when does the tap change, the timing differences etc. I need an interface circuitry to get clear pulses to sense opening and closing of taps. I tried the following sensing/debouncing circuitry, one each for odd and even :

The vcc and gnd are common with arduino as well as tfp. But because of common return path as well as inductance linking, i don't get clear interrupts.
This interface works wonderfully with 2 distinct switches but fails when they are interconnected. Can someone suggest a good interface?

 

I have shown a block diagram in which the odd and even taps are connected together, respectively.

That will create a short-circuit condition, as the two shorted taps look like a shorted secondary.

 

That will create a short-circuit condition, as the two shorted taps look like a shorted secondary.

It won't because the odd and even 'wipers' are not linked. As long as each roller only connects to one tap at a time all will be well.

Can someone suggest a good interface?

Does the transformer have any AC connected to it while you are doing this?

 

It won't because the odd and even 'wipers' are not linked. As long as each roller only connects to one tap at a time all will be well.

My comment was based on this statement.

There is overlapping between even and odd taps.

Perhaps I didn't correctly understand that statement.
How would you interpret it?

 

My comment was based on this statement.
Perhaps I didn't correctly understand that statement.
How would you interpret it?

I understood it to mean that both the even and odd rollers could be connected to taps at the same time.
So the even roller is sitting on tap 0. As the actuator moves, the odd roller contacts tap 1 before the even roller leaves tap 0.

 

It won't because the odd and even 'wipers' are not linked. As long as each roller only connects to one tap at a time all will be well.


Does the transformer have any AC connected to it while you are doing this?

No..I don't have to do it on live transformer

 

My comment was based on this statement.
Perhaps I didn't correctly understand that statement.
How would you interpret it?

I haven't shown the additional circuitry. There are contactors and resistances for limiting the short circuit current and potential equalisation.

 

is the forum alive ??

 

This thread is.

 

Waveform at low notches



waveform at high notch... how to filter out the noise is the main concern... further, at higher notches, larger part of auto winding comes into picture making the circuit more inductive and thus the reversal of polarity in one waveform can be seen when the other tap open..