[SOLVED] circuit bugs :solar charge controller idea

[myfaithnka]

hi all,
I am trying to make a simple charge controller using 555 to charge my emergency(6v sla battery) from a solar panel of 12 v.

This is the circuit made i on bread board,

the output pulses drives a mosfet. There i found problems. Oscillations from 555 goes dead and mosfet gets heated.

is there any problem with this circuit? please give your suggestions and corrections.

thanks

 

[godfreyl]

I'd expect the BC547 to get damaged due to the base being over-driven. There should be a current limiting resistor between it's base and pin 3 of the 555.

Why do you need the BC547, Rb and Rbb anyway? Can't you drive the MOSFET directly from pin 3 of the 555?

Also, what is the purpose of R1? It doesn't seem to have any useful purpose.

 

[myfaithnka]

I'd expect the BC547 to get damaged due to the base being over-driven. There should be a current limiting resistor between it's base and pin 3 of the 555.

Why do you need the BC547, Rb and Rbb anyway? Can't you drive the MOSFET directly from pin 3 of the 555?

Also, what is the purpose of R1? It doesn't seem to have any useful purpose.

i needed an inversion because the mosfet should switch more during low light and less during high light.

r1 is the charging path for oscillation capacitor i assume.

is there any foolish things i have done ?

 

[adi0803199]

I think that the timer IC has not been properly configured in astable mode.Check the datasheet.Try either disconnecting the pin 7 or connect the pin 7 properly to the node in the schematic.

 

[amayilsamy]

Try this ..

 

[myfaithnka]

thank you,i am looking its out put now

 

[pilko]

@ amayilsamy,

Nice schematic --- what is your software?

 

[amayilsamy]

It is proteus from Labcenter electronics... Its good simulation software..

 

[pilko]

@ amayilsamy,

Thank you

 

[Jibby Benjamen]

Too badly designed a circuit. Wrong input to Pin 5 . Direct drive to the transistor from pin 3 and many other mistakes.