[Milsurplus] [armyradios] 400 Hz Static Inverter

[Meir WF2U]

What input?

Meir WF2U
Landrum, SC

-----Original Message-----
From: armyradios at yahoogroups.com [mailto:armyradios at yahoogroups.com] On
Behalf Of J. Forster
Sent: Saturday, April 28, 2012 6:26 PM
To: armyradios at yahoogroups.com; vintage-military-RADAR at yahoogroups.com
Cc: milsurplus at mailman.qth.net; MRCA at mailman.qth.net
Subject: [armyradios] 400 Hz Static Inverter

In looking for a static inverted to output about 500 Watts of 400 Hz, it
ocurred to me that it might be possible to modify a current 60 Hz inverted
for 400 (or 800-2400) Hz.

My rationale is as follows:

Years ago, static inverters took 12/24 VDC and used that as the supply to
the center tap of a power transformer as push-pull drive. This needed a
big, heavy, expensive custom transformer.

Now, there has been a clever change. The 12/24 VDC is up-converted to
about 170-180 VDC using chopper FETs and a high frequency transformer,
running at >20 kHz. This HF transformer is small, light, and cheap.

The170 VDC is then converted to a square wave, or modified square wave,
with an "H" bridge of transistors or fets, possibly filtered, and then to
the device being powered.

Has anybody tried modifying such a supply to provise frequencies other
than 60 Hz? I suspect it'd be pretty easy.

Alternatively, does anyone have prints for a roughly 500 Watt unit that is
currently available?

Thanks,

-John

=================





------------------------------------

For current radio net info, see the bi-weekly net 
announcement which is sent to you via e-mail.

The net schedule can also viewed at any time, 
by going to: 

http://groups.yahoo.com/group/armyradios/files/armynets.txt

The URL for the armyradios group at Yahoo is:
http://groups.yahoo.com/group/armyradios

Community email addresses:
Post message: armyradios at yahoogroups.com
   Subscribe: armyradios-subscribe at yahoogroups.com
 Unsubscribe: armyradios-unsubscribe at yahoogroups.com
  List owner: armyradios-owner at yahoogroups.com

Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/armyradios/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/armyradios/join
    (Yahoo! ID required)

<*> To change settings via email:
    armyradios-digest at yahoogroups.com 
    armyradios-fullfeatured at yahoogroups.com

<*> To unsubscribe from this group, send an email to:
    armyradios-unsubscribe at yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/