[Milsurplus] [armyradios] 400 Hz Static Inverter

[J. Forster]

First choice: 115 VAC 60 Hz.
But I don't want something that doesn't need a cart, two men and a boy to
move.

Second choice: 24-28 VDC in.

Third choice: 12-14 VDC in.

I need 80 or 115 VAC at 380-800 Hz @ <300 Watts.

And no screaming mimis (rotary inverters). A Georator is out too.

-John

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




> 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
>
> =================
>
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