Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Detect low voltage and power outage detector

Status
Not open for further replies.
R

romel_emperado

Advanced Member level 2
Joined
Jul 23, 2009
Messages
606
Helped
45
Reputation
132
Reaction score
65
Trophy points
1,318
Location
philippines
Activity points
6,061
Hi guys Im planning to make an automatic failover system.

our power line is 220VAC and I want to consider 8% of that is already low voltage and it should turn on the backup power..

power cut off is easy to detect but Im asking idea on how to properly detect the low voltage....

anyone?


I will use PIC MCU for this experiment..

Thanks so much
 

simply use ADC sensing topology . like this ,,,,,
Code: 
 /*****************************************************************************
  Main Program
 ****************************************************************************/
void main()
{
   disable_interrupts(GLOBAL);

  // Initilize RAM Variables
  ..
  ..// Do something
  ..
   enable_interrupts(INT_TIMER1);
   enable_interrupts(GLOBAL);

   while (1)
   {

     // Do something
if (volt <= 202)
      return(low_VOLTAGE);
   } // Loop Forever  


} // End Main

//
 
yes.. i should ask in my previous post if it's not dangerous if I monitor directly to the power line?
I'ts all about some simple circuit before I sense the voltage to my ADC.

yes it's all about ADC topology but 220V is big for my adc..

can I use step down transformer for this to detect 8% low voltage? A 12V secondary output transformer

---------- Post added at 18:34 ---------- Previous post was at 18:33 ----------

Im not sure if I can detect it by using a transformer
 

romel_emperado said:
yes.. i should ask in my previous post if it's not dangerous if I monitor directly to the power line?
I'ts all about some simple circuit before I sense the voltage to my ADC.

yes it's all about ADC topology but 220V is big for my adc..

can I use step down transformer for this to detect 8% low voltage? A 12V secondary output transformer

---------- Post added at 18:34 ---------- Previous post was at 18:33 ----------

Im not sure if I can detect it by using a transformer
Click to expand...

have u any proper sch for it .
yes u can use step down transformer for this to detect 8% low voltage , or step down 220 v ac supply using diver network .
what mcu u want to use ?
OK ...
 
I don't have schematic I just imagine what will I do in the future ;)

I got that.. thanks so much.

will let you know the update..
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top