Hello. This is a small, adjustable step-up boost converter I got from banggood. Com i'm going to take it out and do some tests. The input voltage is between 3.5 and 32v. and the output voltage is between 5 and 35v.
The output current is 2.5a, 3 if you add a heatsink. The output voltage can be adjusted using this potentiometer, and it's regulated to 0.5%. This is a mini voltmeter i've connected to the output of the boost converter.
The mini voltmeter goes up to 100v. I'm powering the boost converter using this buck converter, which i've also reviewed. And i'm measuring the output of the boost converter using this ammeter.
Here I have a 1k resistor. This is a 100ohm resistor. 50ohm resistor. And a series of 2 10ohm resistors. I'm going to start by setting the output voltage of the boost converter to 10v.
You can see that even if it's not connected to a load, it draws 15ma. Connecting it to the 1k load. And it has 10ma on the output, but it draws 36ma.
The 100ohms. You can see that the voltage is pretty stable. 50ohms. 20ohms. And let's try 10ohms. And again, pretty stable (output voltage).
Raising the output. And let's go through the same sequence. 1k, 100ohms, 50ohms, 20 ohms. I need to raise the limits of my source. Let's set it to the 6 amps maximum.
Let's go again, 20ohms. The voltage on the boost converter seems to drop. And my resistors are smoking. Let's try the 10 ohms.
These are 10 1ohm 5w resistors. I've set the output of the boost converter to 10volts. Because the wires that i'm passing the current through are 2 ohms, i'm going to only connect 8 of the resistors, and we should get 1a.
And we do. And we're drawing 2.6a from the buck converter. I set the boost converter to 20v, but I had to raise the buck converter to 10v so that it can supply the required current that the boost converter requires to get 2a out when I connect this 10ohm load.
And we should get 2a. And we do. We're drawing a bit over 5a from the power supply, in order to output 2a at 20v.
We have 10v and 5a on the input, which gives 50w of power, and on the output we have 20v with 2a which is 40w. At these settings we get a conversion efficiency of 80%.
But if we connect a 100ohm load, we have 10v on the input with 450ma, which is 4.5w of power. On the output we have 20v, with 200ma, which is 4w of power.
Giving us a conversion efficiency of around 89%. I'm using this bulb because my resistors can't handle the power output. I've set the voltage on the buck converter to 5v, and the voltage on the output of the boost converter is 35v.
If we measure the input current is 630ma, with 5v. That gives us 3.15w, and on the output we have 35v and 75ma which is 2.6w. That gives us a conversion efficiency of 83%.
These types of boost converters are very useful on projects where you have limited space or you need portability. Here, for example, i'm powering this 12v fan from a single lithium cell. The cell outputs 3.8v and the boost converter gives out 12v.
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