What component (s) do i add in this circuit diagram

[ermsk8er]

What component (s) do i add in this circuit diagram to boost the voltage output more than my input voltage ( 6v dc) with constant amperes. thanks!

 

[ronsimpson]

Out put voltage larger then input voltage.....will never happen with this circuit. Look for a 'boost' circuit.

Constant current.......are you driving LEDs. This and most power supplies are constant voltage. Look for boost LED driver.

 

[ermsk8er]

Out put voltage larger then input voltage.....will never happen with this circuit. Look for a 'boost' circuit.

Constant current.......are you driving LEDs. This and most power supplies are constant voltage. Look for boost LED driver.

No im not driving any leds in that circuit. I will use that in driving a dc brushless motor. Here is my project, i am planning to build a solar powered fan. 6v solar cell and 6v chargeable batt. And i want to boost that input into 12 volts. Thanks 1 to you!

 

[ronsimpson]

I think you have 6V solar cell and it charges a 6V battery.
I think you have a 12 volt motor.

If this is true. A 'boost switching power supply' can take 6V 2A from the battery and run a 12V 1A motor.

 

[ermsk8er]

I think you have 6V solar cell and it charges a 6V battery.
I think you have a 12 volt motor.

If this is true. A 'boost switching power supply' can take 6V 2A from the battery and run a 12V 1A motor.

Thats it.. But i cant find the right circuit for that.. Do you have one, sir? I cant build a 12v because its to expensive and the 12 battery is to heavy and overall it will cost me alot.. Thanks!

 

[ronsimpson]

I don't know where you are. In the USA you can look on ebay.com and search for "DC Boost Converter 3-24V to 5-25V Battery Step Up Switching Power Supply Module". It can be set for 6V in 12V out at 1/2A. I know that is too small.

See attached data sheet. Look at fig. 2.

 

[ermsk8er]

I don't know where you are. In the USA you can look on ebay.com and search for "DC Boost Converter 3-24V to 5-25V Battery Step Up Switching Power Supply Module". It can be set for 6V in 12V out at 1/2A. I know that is too small.

See attached data sheet. Look at fig. 2.

Thanks sir for the quick response.. I will analyze the circuit inside the pdf that you gave me. By the way, im living here in Philippines.

 

[ermsk8er]

@sir ronsimpson
Refering to the datasheet that you attached please see figure 42 page 25 boost regulator.. Can i add or change the R2 with a variable resistor with value of 5k so that it will become adjustable?

 

[ronsimpson]

Replace R1 not R2. Will work at any voltage above 1.23V. Will not go to 0V! Can use pin 1 for on/off or 0V.

VOUT = VREF (1 + R1/R2) where VREF = 1.23V

R1 = R2 (VOUT/VREF − 1) where VREF = 1.23V

 

[ermsk8er]

Replace R1 not R2. Will work at any voltage above 1.23V. Will not go to 0V! Can use pin 1 for on/off or 0V.

VOUT = VREF (1 + R1/R2) where VREF = 1.23V

R1 = R2 (VOUT/VREF − 1) where VREF = 1.23V

Thank you very much, sir! Take care!