Direct Coupling [RE-wrenches]

[Jeffery Wolfe, Global Resource Options]

"standard AC ballast". If it's defined as a magnetic transformer type,
you're right. If it's defined as an electronic type, it's different.

The way an electronic AC ballast works is by rectifying the AC into DC. When
you do this, you get something like 165V DC out. This DC is then fed into a
chopper to make 400V 20,000 Hz AC.

When DC is put into a rectifier, it passes straight through. There are
losses, depending upon current flow and rating, but nothing goes boom, and
no smoke is released.

So when the proper level of DC is put into an AC (electronic) ballast, the
ballast operates identically to putting AC into it. For a 120VAC ballast,
you need about 165VDC. For a 277 VAC ballast, you need about 375 VDC.

The other Jeff again.

-----Original Message-----
From: Jeff Yago [mailto:jryago at earthlink.net]
Sent: Friday, April 18, 2003 11:59 AM
To: RE-wrenches at topica.com
Subject: RE: Direct Coupling [RE-wrenches]




"As I understand it, you can pump 165 VDC into a standard ballast and
operate
with no problems. "

Mark:

A standard AC lighting ballast is a type of transformer.  I have yet to see
a DC transformer, although they has been trying since Edison invented DC
lighting.

Ballasts designed to operate fluorescent lighting on DC power include an
electronic circuit to either convert the DC into a square wave on-off pulsed
electrical flow which can operate through a transformer, or generate a very
high frequency waveform that does not require any ballast.

A standard AC ballast connected to a constant DC voltage source might make a
good electro-magnet though!

Jeff Yago

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