Showing posts with label automatic. Show all posts
Showing posts with label automatic. Show all posts
Tuesday, April 9, 2013
A Simple 5 KVA to 10 KVA Automatic Voltage Stabilizer Circuit Explained 220 Volts 120 Volts
The diagram shows a rather simple voltage stabilizer design which can hold huge output power in the order of 5 to 10KVA. The use of SSR or solid state relays makes the output stage easy to configure and very accurate - thanks to the modern SSRs which are designed to trigger massive power in response to smaller input DC potentials.
The circuit is pretty simple to understand. All the opamps are arranged in standard voltage comparator modes.
The presets P1 to P7 can be adjusted as per the required tripping points, which will correspond to the output SSR switching and the subsequent transformer tap selections.The central green TAP is the normal voltage output, the lower TAPs gradually produce higher voltages while the upper TAPs are set for lower voltages.
These TAPs are chosen by the appropriate SSRs in response to the varying AC voltages, thus adjusting the output voltage to the appliances close to normal levels.This circuit was asked by Mr. Alexandar and the SSR data was provided by him.
Parts List
R1 to R9 = 1K, 1/4 watt,
P1 to P7 = 10K preset,
C1 = 1000uF/25V
VR1 = 1K Preset,
opamps = IC 324,
Transformer = Input 230volts or 120volts, Taps - incrementing/decrementing voltage levels (TAPs) as per individual specs.
SSR = 10KVA/230volts = output, 5 to 32 volts DC = input
COMPLETE SSR SPECIFICATION CAN BE FOUND HERE:
http://www.unisoncontrols.com/ssr-dc-to-ac-1ph.php
The circuit is pretty simple to understand. All the opamps are arranged in standard voltage comparator modes.
The presets P1 to P7 can be adjusted as per the required tripping points, which will correspond to the output SSR switching and the subsequent transformer tap selections.The central green TAP is the normal voltage output, the lower TAPs gradually produce higher voltages while the upper TAPs are set for lower voltages.
These TAPs are chosen by the appropriate SSRs in response to the varying AC voltages, thus adjusting the output voltage to the appliances close to normal levels.This circuit was asked by Mr. Alexandar and the SSR data was provided by him.
Parts List
R1 to R9 = 1K, 1/4 watt,
P1 to P7 = 10K preset,
C1 = 1000uF/25V
VR1 = 1K Preset,
opamps = IC 324,
Transformer = Input 230volts or 120volts, Taps - incrementing/decrementing voltage levels (TAPs) as per individual specs.
SSR = 10KVA/230volts = output, 5 to 32 volts DC = input
COMPLETE SSR SPECIFICATION CAN BE FOUND HERE:
http://www.unisoncontrols.com/ssr-dc-to-ac-1ph.php
Thursday, April 4, 2013
How to Make a simplest Automatic Battery Charger Circuit Using Just a Single Relay
Amazed to hear this! Yep that’s actually possible, you would need only one relay and a handful of diodes to make a simplest one relay automatic battery charger circuit.
The idea struck me while trying to design the easiest possible battery charger circuit for one my clients.
The concept is simple; just raise the operating or triggering voltage of the relay up to the optimal battery charging threshold voltage by dropping the required amount of supply voltage to the relay coil, with the help of series diodes.
The idea may be understood from the following points:
Take an ordinary relay, measure its triggering voltage by carefully applying a variable voltage across its coil.
Now suppose the triggering voltage of the particular relay was about 9 volts, and also assume you want to raise its voltage to 14 volts, which may be your 12 volt battery’s charging threshold voltage.
We know that a 1N4007 diode drops about 0.6 volts across it, so if we add sufficient number of diodes in series with the relay coil would hopefully pull its tripping or triggering voltage to about 14 volts.
That means, 14 – 9 = 5, we’ll require 5/0.5 = 10 diodes in series to achieve this rise in the triggering voltage of the relay.
That’s pretty simple and interesting isn’t it?
The rest may be done with the help of the shown diagram…..your simplest single relay automatic battery charger is ready.
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