1 - 18 of 18 Posts

Black Dog

·
RIP 1959-2015
Joined
·
10,750 Posts
I'm watching now:laughing:

·
Banned
Joined
·
11,766 Posts
Discussion Starter
I'm watching now:laughing:
Turn up the volume to max in video two, for a real world audio experience. :laughing:

circuitman1

·
Registered
Joined
·
1,054 Posts
really cool stuff!:thumbup::thumbup::thumbup:

circuitman1

·
Registered
Joined
·
1,054 Posts
really cool stuff! thanks for sharing! :thumbup::thumbup::thumbup:

five.five-six

·
Registered
Joined
·
6,960 Posts
Groovy music in that first clip!

Electric_Light

·
Light Emitting Decoration
Joined
·
1,323 Posts
indiainternetuniversity.in hehe

Zog

·
Registered
Joined
·
5,446 Posts
20 years ago I was lucky enough to participate in some of the testing phases of using IGBT switching technology while working at a Navy testing facility, DC has certain advantages in submarine applications so lots of funding and testing of the HVDC systems we are seeing today came from all that research and testing.

·
Banned
Joined
·
11,766 Posts
Discussion Starter
20 years ago I was lucky enough to participate in some of the testing phases of using IGBT switching technology while working at a Navy testing facility, DC has certain advantages in submarine applications so lots of funding and testing of the HVDC systems we are seeing today came from all that research and testing.
When the IGBTs turn DC into AC, is it a pure sine wave or is the wave square with something smoothing into a sine wave?

Zog

·
Registered
Joined
·
5,446 Posts
Neither, you have 2 opposing (+/-) signals that are either gated on or off, always at full voltage, by changing the timing and duration of these you can shape a pretty smooth effective sine wave.

pete87

·
Banned
Joined
·
1,486 Posts
When the IGBTs turn DC into AC, is it a pure sine wave or is the wave square with something smoothing into a sine wave?

I thought it said up to 200 steps .

Pete

·
Banned
Joined
·
11,766 Posts
Discussion Starter
Neither, you have 2 opposing (+/-) signals that are either gated on or off, always at full voltage, by changing the timing and duration of these you can shape a pretty smooth effective sine wave.

Ok now even more confused :blink: How does a square go to a sine... I guess Im just not seeing something.

Zog

·
Registered
Joined
·
5,446 Posts
Think of the area under each "tower" on curve 3 as a sum of effective energy being equivalent to the smooth sine.

·
Banned
Joined
·
11,766 Posts
Discussion Starter
Think of the area under each "tower" on curve 3 as a sum of effective energy being equivalent to the smooth sine.
So in essence each one is pulsed in varying magnitude, when the sum of all IGBTs is added together over a half cycle we see a rising or falling sine wave?

·
Banned
Joined
·
11,766 Posts
Discussion Starter
Think of the area under each "tower" on curve 3 as a sum of effective energy being equivalent to the smooth sine.
But where does AC smoothing and filtering come in?

·
Joined
·
5,446 Posts
Later