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pic with 2 battery connection

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hiren.dave@bhuved.com

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Hi,


my application is I want to use two 12V battery, with my circuit. In which when one battery is working than another must be charging and vice versa. So if my battery b1 is discharged to 11V from 12V than battery b2 must be connected to my circuit and battery b1 should be connected in charging and vice-versa. for this application i design voltage divider circuit that divides voltage linearly to 5v. this is given to pic18f4550. pic will convert this analog to digital and when change is more than 1 volt, it high the particular pin. Now, the program is completed and i want to connect relay at output of pic. So which relay and relay driver circuit should i use? any other simple logic for my application???
 

hiren.dave@bhuved.com said:
Hi,

i want to connect relay at output of pic. So which relay and relay driver circuit should i use? any other simple logic for my application???
Click to expand...

Hi,

The choice of relay depends and the current and volts the relay contact need to handle.

12v Dc is a typical voltage for operating the coil.

Here are two designs, a simple transistor if you just have the one or two relays, BFY51/52, 2N2222, 2N3704/5 Transistors suitable, or an ic driver if you need several relays.
Note that the diagram for the ic is correct, the input resistors and output diodes are all built into the chip.
 

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hiren.dave@bhuved.com said:
Hi,


my application is I want to use two 12V battery, with my circuit. In which when one battery is working than another must be charging and vice versa. So if my battery b1 is discharged to 11V from 12V than battery b2 must be connected to my circuit and battery b1 should be connected in charging and vice-versa. for this application i design voltage divider circuit that divides voltage linearly to 5v. this is given to pic18f4550. pic will convert this analog to digital and when change is more than 1 volt, it high the particular pin. Now, the program is completed and i want to connect relay at output of pic. So which relay and relay driver circuit should i use? any other simple logic for my application???
Click to expand...

You donot need 2 batteries, just need a battery charge management
The battery needs to be operational only when mains supply is not available - otherwise the circuit can operate on mains supply
and donot use relay in circuit powered from battery (unless you have some ultra low current relay)
if some switching is required mosfets do a better job
 
Thank you very much wp100.

Hi amu_cpln,

friend, actually i want 24V dc. so i have to use two batteries. battery b1 is already with device and it's charging (12v). another battery b2 will be connected by me to get 24V dc. so i want to manage b2 and extra third battery b3 to give constant 12v. now i will put two batteries in series, and will get 24V. if battery b2 discharges to 11V than battery b3 will be connected and battery b2 starts charging and vice versa.
 
hehe .. you still dont need 2 batteries (you are talking of 3 batteries now)
google for voltage boost regulator ..
you can choose from a wide variety of circuits
even a 3.7 volt battery can give you a stable 24 volt supply
 
amu_cpln said:
hehe .. you still dont need 2 batteries (you are talking of 3 batteries now)
google for voltage boost regulator ..
you can choose from a wide variety of circuits
even a 3.7 volt battery can give you a stable 24 volt supply
Click to expand...




Thanks friend for suggesting me. I made a silly mistake.
 
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