Stepping up DC!

[Vizier87]

hence my question in post #16.

 

[qamarbukhari]

qamarbukhari,

A resistive voltage divider is totally unpractical at your current requirements. Even a linear regulator would produce (48-36)*15= 180W of heat. This would require a huge heatsink.

This is a job for a SMPS buck converter with an overall efficiency of ~85% which would reduce the power dissipation to about 30W.

Please confirm if i would go for 5-6 Amp Constant OutPut.

thanks,

Qamar

 

[colin55]

Is is 5 amps or 6 amps?

What regulation do you want?

 

[qamarbukhari]

Is is 5 amps or 6 amps?

What regulation do you want?

I have a rectifier of 48 Volts, with 15 Amp Module, and want to reduce it down to 36 Volts and 6 Amps DC,

 

[colin55]

How much higher than 36v can the output go to?

Is the 6A a CONSTANT value?
What is a "15 amp module?"

 

[qamarbukhari]

How much higher than 36v can the output go to?

Is the 6A a CONSTANT value?
What is a "15 amp module?"

i need a circuit to stepdown 48 Volts (Which are being generated through a rectifier) to 36 Volts, 6 Amp is constant power which will be utilized. voltage can be varried from 36 to 40 Volts.

thanks

Qamar

 

[colin55]

Put two IN5404 diodes in parallel (18 cents each) and this will drop about 0.7v and allow 6A of current to flow without overheating the diodes. Do this 15 times and you have a 10v drop.
Alternatively get four 3R3 10watt resistors and put them in parallel. Do this again and put the first quad of resistors in series with the second quad of resistors.

Put either of these "droppers" on the positive line and it will drop about 10v.

 

[Electroenthusiast]

Here's a simple circit to increase 5v to about 7v:

**broken link removed**

On what factors does Ouptut Voltage and Current Depend?
Can i not use Zener ar Output to get required Output 7V to 6V?