[ARC5] Army/Navy transmitters from a NON COLLECTOR viewpoint, the ham version...

[Brian Clarke]

Thank you, Dennis,

 

Yes, your image came through. This is one of the simpler Cockcroft-Walton designs. And it is full wave. The DC output is actually at 2.8 times Vin, assuming that Vin across the transformer secondary is stated in RMS terms.

 

With this design, the dotted end of the secondary winding is alternately at the highest and the lowest Voltage of the output, less one diode drop. So, insulation needs to be good for 2.8 times Vin.

 

Cheers, Brian

 

On Tuesday, 11 February 2020 6:58 PM, Dennis said:

 

The full wave voltage doubler commonly used in transmitter power supplies since the 70's is a good design.  It utilizes the core well, does not impose DC on the mains or transformer, and inherently allows use of capacitor stacking.  I believe this is one to which Ken is referring.  It's only real disadvantage is that the flying secondary is not ground referred.

 

It is true that oversized lytics increase I squared R losses, which is not a kind thing to do to a tired old transformer used to small lytics and/or chokes input filters. When the full wave doubler was applied to factory-built transmitters the vendor used transformers with a lower winding resistance than the plate transformers of old, thus minimizing the issue.

 

Hopefully, this low res image came through.

 

Dennis AE6C

 



 

 

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