[ARC5] 800 HZ Power: Theoretical Question

[Scott Johnson]

The big problem is still there:  The unit you are powering has presumably
has 800 Hz transformers, and they will sing due to the magnetostriction
effect in  the cores.
I dare say that is why the 800 Hz "experiment" failed, and 400 Hz became the
de facto standard for lightweight AC power applications.  
BTW, the magnetosrictive vibration eventually displaces the lacquer between
the laminations, causing a marked decrease in performance of the
transformer.  This was also a problem in the inverters, and lead to fairly
short service life.

Scott V. Johnson W7SVJ
5111 E. Sharon Dr.
Scottsdale, AZ 85254-3636
H (602) 953-5779
C (480) 550-2358
scottjohnson1 at cox.net
scott.johnson at ieee.org

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of David Stinson
Sent: Friday, November 17, 2017 11:01 AM
To: ARC-5 <arc5 at mailman.qth.net>; milsurplus at mailman.qth.net
Subject: [ARC5] 800 HZ Power: Theoretical Question


Theoretical Question:
Goal: Simple, *quiet* answer to the 800Hz question.

You begin with an unknown inductance with a link-coupled output. (Like
transformers).

Drive the inductance with a powerful Class-C amplifier, sourcing pulses at
freq F.

Make the unknown inductance the PA's "tank,"
introducing tank capacitance to bring the "tank" into resonance at F,
causing the tank to "ring" and provide a sine-wave output.

Rectify the sine-wave output as a DC power source.


So....
Rectify line AC.  Heavy-Current MOSFET pulses the GP or TBW power
transformers at 800 Hz.
"Tank" capacitor across the transmitter primaries resonates and allows the
transformers to "ring."  Ringing transformers output the voltage and away we
go.

Will it work?

73 OM DE Dave AB5S



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