POWERFULL DC-DC BOOST CONVERTER

In this DIY tutorial, we will build a small DC-DC converter (12-24V/72W) which will enable us to power an electronic humidifier for an egg incubator.

A pretty effective trick when you want to save a bit of money on electronic components when building a small homemade incubator.

Note that the applications of this small circuit are diverse; it can be used as a basic assembly for a booster or electric fence electrificators, portable electrolyzers etc...

Portable electrolyzer etc...

CIRCUIT DESCRIPTION 

This boost circuit is built around a UC3843N, operating at high frequency and driving an IRFZ44N mosfet. This circuit can deliver 24V output and up to 3A of current, which gives a theoretical power output of 72W, which is more than adequate for our needs since the humidifier used here only consumes a maximum of 24W. 

Yes, I know; we're all happy to hear that.

Let's be pragmatic and get to the heart of the matter. Here's the list of components required:

• Capacitors
•  C1=100pf
•  C2,C3=1n
•  C4*1000uf/35v

• Resistors
•  R1=100K 1/4W
•  R2=6K8 1/4W
•  R3,R4,R5=1K 1/4W
•  R6=100R 1/4W
•  R7=0R05 1W
•  RV1=10K 1/4W

• Inductor
•  L1=680UH

• Diodes
•  D1=MBR10100CT

• Transistor
•  T1=IRZ44N
• Other
• SMPS power supply 12V/100W
• Misting unit 12V/24W

Important notes 

To build a more powerful version of this circuit (over 100W) with the same boost architecture, here are the essential points to recalibrate the necessary components:

• Use a power supply with a higher Wattage rating than the output power you need, as the efficiency is not equal to unity.

• Use a bench of powerful Mosfet transistors(more than 2 IRFZ44N) at the output, in which case you should also use a powerful Schottky diode more than the MB10100CT and change also the shunt resistor R7 by one powerful using this formula:

R=P/I^2

Where P represents power and I for current in amperes

• Choose an inductor with a large-section winding wire, but not one with very high inductance; otherwise, the output current will drop sharply, which we'd prefer not to do.

You can also increase the cross-section of the winding wire if you're doing it yourself, so choose it according to your maximum output current by consulting the American Standard AWG table linked here:https://www.powerstream.com/Wire_Size.htm

here's the final test video - I hope you enjoy it!

here's the final result 

Test with a 24V/24W humidifier