Hi,
sometime it is adviceable to prefer a LC power supply filter over a CLC one, i.e. an inductor as the first filter element. Given a two way rectifier with a vacuum or a gas filled double diode with direct heating. Usually the first filter element is connected to the center tapped heater winding. Is it a good idea to connect a center tapped choke in parallel with the heater winding and connecting the first filter cap to it's tapping, so that this choke works as the L input? By this way, I think, a gapped core is no more necessary, so the needed inductivity could be achieved by less turns.
Or is it better to use a bifilarly wound choke with a gapped core for this duty?
Best regards!
sometime it is adviceable to prefer a LC power supply filter over a CLC one, i.e. an inductor as the first filter element. Given a two way rectifier with a vacuum or a gas filled double diode with direct heating. Usually the first filter element is connected to the center tapped heater winding. Is it a good idea to connect a center tapped choke in parallel with the heater winding and connecting the first filter cap to it's tapping, so that this choke works as the L input? By this way, I think, a gapped core is no more necessary, so the needed inductivity could be achieved by less turns.
Or is it better to use a bifilarly wound choke with a gapped core for this duty?
Best regards!
You would need the AC and DC to go in opposite directions to make use of a common-mode choke. In a PSU smoothing application they go the same way. No free lunches!
Choque input filter is my prefered, but in your case you will need a large choque capable of carrying heater current (Several amperes) with negligible DC loss, but with sufficiently high inductance to provide choque input action. So it will be very large, bulky and expensive, although it can run.
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