The
main circuit for this Wind Power Generator in Train System is charging circuit.
The system is using wind generator to charge the 12VDC battery. A relay is used
to start or stop charging. This relay is controlled by PIC microcontroller.
Whenever the charging operation is running, a LED indicator will turn on else
the LED indicator will turn off.
Two
voltage dividers are being used to detect battery voltage and wind generator
voltage. The voltage divider is used to avoid over voltage over 5V access PIC
microcontroller.
Below
shows the calculation for the voltage divider:-
- When voltage input from wind generator or battery is 15.64V, PIC will get maximum voltage 5V.
Ratio
= Voltage input from wind generator or battery / PIC voltage
Ratio
= 15.64V/5V
Ratio
= 3.128/1
So,
the ratio is 3 to 1
Voltage
divider formula:-
VDR
= [R1 / (R1+R2)] x Vin
[4.7k
/ (4.7k + 10k)] x 5V = 1.599V
[10k
/ (10k + 4.7k)] x 5V = 3.401V
Total
voltage = V1 + V2
Total
voltage = 3.401V + 1.599V
Total
voltage = 5V
3.401V
x 3.128 = 1064V
1.599V
x 3.128 = 5V
Total
voltage = V1 + V2
Total
voltage = 10.64V + 5V
Total
voltage = 15.64V
So,
input voltage must not exceeding 15.64V or else PIC will burn because PIC only
supports 5V.
Hi,
ReplyDeleteI want your help to understand one of the line in your program.
set_adc_channel(1);
delay_ms(10);
adc2=read_adc();
mybat=adc2/65.41;
delay_ms(10);
how did you calculated 65.41
It is a useful and charming post.It is extremely helpful for me.
ReplyDeletegenerator maintenance & bunded fuel tank hire