Re: Need electronic experts pointers...
From: Suraj Singh (surajs21_at_yahoo.com)
Date: 10/12/04
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Date: 11 Oct 2004 19:37:04 -0700
Here is a simple circuit for an DC-AC Inverter for begineer.
http://www.aaroncake.net/circuits/inverter.htm
I have two comments based on your description:
1. For a 500 Watt output you need to draw 500/12 = ~ 40A from a 12 v
battery which is quite high for a transister/MOSFET switch to handle
without too much power wastage. So think of using 48V battery.
2. Square wave is not recommended for inductive loads such as motor,
fridge.
Seraphina Lee <seraphina_lee_my@hotmail.com> wrote in message news:<1skdl01a0l415cseq3ob914k7403gve6li@4ax.com>...
> Dear all,
>
> I am an electronic hobbyist... beginner :) ... and have mainly
> theoratical knowledge of electronics. I've decided to design and
> build, what i call, a BBU. I'm not sure if this is going to tedious
> but i'm willing to give it a try. I've found so far 1 schematic
> diagram and the reason i'm posting here is because i would like to
> gather more pointers regarding the BBU or perhaps links to any other
> 'royalty free' schematic diagrams which fulfils the following;-
>
> Design Philosophy
> The purpose of this Battery Back-up Unit (BBU) is for the back-up of
> equipment such as (aquarium... maybe fridges at a later stage)
> especially motor loads during power outage. During normal conditions,
> the battery will be charged through a 13A switch socket outlet. The
> equipment will be attached in series with this BBU unit. When a power
> disruption occurs, this unit will cut out the charging unit and will
> deliver power to the load via a Lead Acid Battery which is on stand-by
> mode. There will be an interruption during this switch over. When the
> power supply is available, the BBU will switch the load supply from
> Battery to main power supply. Then the battery charger will charge the
> battery that has been consumed. When the battery is fully charged,
> trickle charging mode will be selected automatically to ensure a
> healthy battery for next power outage.
>
> Tech Details
> Battery Charger input source: 240VAC 50Hz 13A Plug-Top*
> Battery Charger Output Current: 5A
> Charging Algorithm: 1. Trickle Charge 2. Bulk Charge 3. Over-Charge
> 4. Float Charge
> Battery: Lead Acid 12VDC (Maintenance Free Battery)
>
> Inverter
> DC Input: 12VDC**
> Rated Continuous Power Output: 500W
> Max Surge Power Output: 1000W
> AC Output Waveform: Square Wave
> AC Output source: 240VAC 50Hz 13A Switch Socket Outlet*
> Frequency Output: 50Hz
>
> Options
> *Variable input 220 - 240VAC 50Hz
> *Variable input 110 - 120VAC 60Hz
> **24VDC
>
> Would appreciate it if some kind soul out there could point to me to a
> site (which either sells or gives out free schematic diagrams) which
> does the above. Other pointers / tips before start of work would also
> be appreciated even though many have told me that it's extremely
> simple to create :) It's always the case of 'easier said than done' to
> me..
>
> Many Thanks,
> Seraphina L.
> seraphina_lee_my@yahoo.com
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