[GreenKeys] 400 Hz MITE Power Supply

[William Wuttke]

MITE AN/TGC-14A(V) Tactical Teletypewriter:

http://www.rtty.com/development/teletype/mite/index.html
and
https://youtu.be/lnBxZc6sOmg

Bill

On Fri, Jul 7, 2023 at 7:35 AM steve bennett <raleigh_ranger at yahoo.com>
wrote:

> What are you powering? A 400hz printer? Is this aircraft related?
>
> -Steve
>
> On Thursday, July 6, 2023 at 05:26:37 PM EDT, William Wuttke <
> wcwuttke at gmail.com> wrote:
>
>
> I just got my 400 Hz MITE power supply kludged together for testing. It
> works well! It uses a EGS002 SPWM Sinusoid Inverter Driver Board (slightly
> modified) driving a MOSFET H-Bridge driving an old UPS transformer -
> powered by a 12VDC 30 amp switching supply. It draws about 2 amps (DC) at
> idle and about 8 amps when the MITE is powered on. Looks like the MITE
> draws about 6 amps (x 12 Volts) or about 70 watts which is what the spec
> says it should draw from the AC supply. The heat sinks stay cool. Now I
> have to get rid of the RFI it generates - probably going to line the Apache
> box with copper tape. Apparently, the distortion you see on the sine wave
> is due to the voltage regulation of the EGS002 which varies the PWM pulse
> width to regulate the voltage. The meter is reading the output voltage
> feedback, which is compared against a 3 volt reference for regulation. Now
> I don't have to swap out my one 60 Hz motor between printers for
> troubleshooting. (The spare (400 Hz) printer needs some work, but will
> print out the QBF message.)
> 73
> Bill
>
> [image: IMG_1944.jpeg]
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