Consider a 1:1 transformer.
Short DC pulses are applied to the primary (input) coil. Once it's positive current pulse, once it's negative current. It's not strict alternating current (i.e. two successive positive pulses are possible). I want to block negative current on the secondary coil without using any diodes.
Is it possible at all?
I thought about two possible solutions:
- connect secondary (output) coil to the solenoid densely wound around a permanent magnet. This way the current flowing in one of the directions will see the resistance, because it will be harder for it to build magnetic field that is in opposition to the magnet's field. Is it the right thinking?
- connect secondary (output) coil to DC voltage source so there will be constant DC current in the coil. Positive induced voltage will pass, adding to the existing DC bias. Negative induced voltage will be blocked by the opposite current - or - will it subtract from the existing DC bias?
I'm looking for a way to pass positive pulses through the transformer and block the negative ones without using any semiconductors.
Duration of all consecutive pulses is constant. Input voltage is also constant, between 1-5V, but it may drop after being passed through many transformers connected in series.
"Transformers" are supposed to be microfabricated (printed) on PCB as pairs of inducively coupled microcoils. Many of them will be connected in series. It's currently not possible for me to microfabricate semiconductor elements, including any diodes (only copper wires are possible). Also, any vacuum tubes will be too big to use them.
One possibility is to use microwires that are routed to one or few external components, but I don't want to mount an external diode for every microcoil, because there may be many of them.