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Re: " impedance" of the 10H choke at 120Hz

Posted by cheap-Jack (M) on January 29, 2004 at 06:56:36

In Reply to: impedance of the 10H choke at 120Hz posted by throbbinnut on January 28, 2004 at 08:58:05:

Hi Chris.

First off, the formula is for reactance X, NOT impedance (which is
the VECTOR sumation of DC resistance R, reactance of the capacitance, Xc & reactance of the inductance XL in the circuit).

So you mean the reactance XL of the inductance is 7.539-ohm. Strictly
speaking, the calculated impedance of a 10H inductor should be XL + DCR, assuming the stray capacitance inside the inductor is negligible to induce additional Xc & vector shift.

So, why 120Hz? How are you so sure that this is a full wave rectification. It could be half wave or bridge-type (double full wave) rectification.

Back to the issue, while XL is to suppress AC rippling of the HV,
larger the better, provided the too big henries would not 'ding' up
overshoots from the filter caps. We must not confuse with its DC resistance which should be lower the better to reduce the undue DC voltage drop throughout the HV circuit.

Here comes in the application of active or passive regulators to provide the voltage drop required by the load plus stablization, without which filter chokes & resistors alone can't achieve.

Good "impedance" listening

cheap-Jack
Jan 29, 2004.

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