500A power source

[Michael Terrell]

On Saturday, April 4, 2020 at 2:38:11 PM UTC-4, upsid...@downunder.com wrote:

On Sat, 4 Apr 2020 09:36:53 -0700 (PDT), Michael Terrell wrote:

On Saturday, April 4, 2020 at 9:59:36 AM UTC-4, Winfield Hill wrote:
Michael Terrell wrote...

The main power transformer from one piece of broadcast
NTSC video equipment I maintained in the late '80s had a
1000A, regulated 5VDC power supply that was over a half ton.
It ran on 208, three phase. It was in a Vital Industries
'SqueezeZoom. It was the first electronic special effects
system of its kind, and it sold for US $250,000.

That 1000A supply was used for a Z80B based computer system,
with a lot of slow, power hungry RAM. Enough to store two
pages of live video, and chroma.

Whoa, a 5kW Z80 system! Most of ours were under 100W.

It was a full relay rack of circuit boards and fans. 768KB of 12 bit wide 4Kx1 TI DRAM per video page.

With 768 KB x 12 bits that makes just more than 2200 chips, consuming
less than 100 W, since all chips weren't accessed all the time.

The available SRAM was so slow that 16 DRAM chips per bit were addressed at once, then read in sequence to get the required data rate.

More likely 12 or 24 chips/sample.

It was 16 by 18 chips, per 4K of page RAM, per board. The video output of the system was as clean as what it was fed. These were designed to be used by networks at Master Control. It could even take unstabilized video from an unsynced VCR, and clean it up enough to use for broadcast. This allowed News departments to use cheap, portable VHS machines to cover stories, instead of a remote van with U-Matic, or 1" VTRs.

 

[Flyguy]

On Wednesday, April 1, 2020 at 2:35:51 PM UTC-7, Winfield Hill wrote:

In my search for a 8 to 10V, 500A source,
needed for 2 seconds, I've been looking at
LiFePO4, and LTO (Lithium Titanate) cells,
in 38120 and 66160 sizes. All types of
suppliers, plus completed battery systems,
with charge balancing electronics. Sheesh,
it's enough to make one's head spin. BTW,
a simple "12V" battery has a bit too much
voltage, an extra burden on power MOSFET(s),
so cell-by-cell connectivity would be nice.
Probably gonna be at least $500, no matter.
Gotta ask Rob Legg what he thinks.


--
Thanks,
- Win

You have stuck with the same MOSFET that you said won't work.