From: "Tom Faloon"
Subject: Re: How I could superpose a high power ac signal (600Veff, 300Hz), with a high dc voltaje (3000 V DC)?
Date: Fri, 18 Oct 2002 14:51:40 +0100
NNTP-Posting-Date: Fri, 18 Oct 2002 13:52:39 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Fernando Rodríguez wrote in message
> Hi everybody!,
> I want to superpose a inverter ac voltaje signal with a dc signal, and
> I would be gratefull is someone could tell me how can I do it and send
> me and send me the circuit. Thank you in advance.
You didn't say how much power?
If the load current is low, then a low tech solution would be to use an
Use a transformer with secondary having an output is 600 V ac. Connect one
side of the secondary to 3000V DC. The other end of the secondary will have
600V ac, superimposed on 3000 V DC. Such a transformer requires insulation
between cores which can withstand max DC + peak ac, on a continuous basis.
(3850 Volts.) This may not be easy to find 'off the shelf'.
This approach may not be suitable if there is any appreciable output
current. (The secondary winding introduces a resistive drop, and more
importantly, the transformer may not like a high DC current flowing in it's
winding, since it will set up a static magnetic field in the transformer.)
Regardless of how you do this, remember that these voltages can kill, unless
the current is limited to a very low value. It is essential to provide
safety precautions, not just to protect yourself, but also to protect
everyone who has access to the area. i.e they must not be able to touch any
of these high voltages, even with probing fingers, or with the aid of metal
objects, and all metal parts, including the transformer core should be
connected to safety earth. You have a responsibility to find what safety
standards apply, and to conform to them. That is IMPORTANT.