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In Reply to: Negative Side Choke posted by Triode_Kingdom on August 20, 2015 at 05:58:20:
To do a useful analysis, you must first determine the power transformer's winding design. When I tried to explore that last night, I came up with a very complicated circuit!
In the first analysis, the capacitance between a winding and an adjacent core (which is chassis/safety grounded) will be several hundred picofarads - not a big deal at 120Hz, but enough to pass tons of diode switching noise and other HF junk. It greatly exceeds the self-capacitance of the filter choke winding.
More realistically, consider a primary winding adjacent to the core, followed by a HV winding with the center tap in its middle. Further assume the power line neutral is adjacent to the core. Then there is a capacitance from neutral to chassis ground (the core) in parallel with the house wiring which grounds the neutral line at the power entry box. Between the hot side and neutral of the primary there is a voltage source of 120v. From the hot side to the secondary is another capacitance, followed by anther voltage source of the HV half winding, to the center tap. All of this is in parallel with the filter chokes. Lots of opportunity to induce noise bypassing the choke impedance.
At that point, realizing it was both complex and dependent on the design of the specific power transformer, I went to bed. :^)
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Follow Ups
- RE: Negative Side Choke - Paul Joppa 10:34:24 08/20/15 (2)
- RE: Negative Side Choke - Triode_Kingdom 21:54:25 08/20/15 (0)
- RE: Negative Side Choke - deafbykhorns 16:29:35 08/20/15 (0)
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