DC-DC BOOST CONVERTER: EFFICIENCY & UNDERVOLTAGE PROTECTION!

#diy #power
This video was made to show how to set the under voltage threshold of a DC-DC constant current boost converter. Also in this video, we showed how to measure the efficiency of the 1500W boost converter using some cheap digital power monitors.

Relevant videos:
1800W, 10-60V to 12-96V Constant Current DC to DC Boost Converter, for Ebike, and Battery Charger.

RELEVANT COMPONENTS: Affiliate links

[dalenassar]

I noticed the same voltage drops in my power monitor (that looks exactly like the one you show at about timestamp 5:40 ) which, for mine, is rated for 200 Amps. Even around 70A when charging super capacitor banks, the wires became hot causing false readings. The fix was simply to replace the monitor wires with much thicker wires. They don't fit so nicely, but it cured the problem...which could become very significant at 200A!

[mentalfusin]

Great video!!
Very well explained and easy to understand.
Thanks a lot for making these videos. I learned a lot from watching your videos.
👏👏

[dalenassar]

After the last comment, I hooked my adjustable bench supply and tried out the UVP adjust pot. I couldn't get a very precise value as there seems to be a good bit of play (hysteresis) in this control function. Also, If I got near enough to the setpoint (while the LED was still off), I noticed that if I wait a few seconds, without turning the pot, that the LED would slowly start turning on...same with turning off...I guess it takes a bit of trial and error to get an 'exact' shut-off value.
THANKS FOR ILLUSTRATING THIS FUNCTION...I never found any details on using UVP!

[ryanmcneal]

Did you need to change the CC potentiometer off camera? Do the lights pull the require amps? I have a similar situation where I need to power a light at 72-74 volts with a 12v battery.

[christianschmidt]

Thank you for the video, can you please upload the STL File for the holder?

[owenhewitt-mu]

Hello my e scooter delivery is a 60v setup. Can you let me know what would be the best way to incorporate my converter for a better performance please. The motor is a 1000watt @ 60v using a lithium 60 battery pack i would be most grateful for the help.

[pascalfiabane]

Thank you for your great videos. I have a question. if I take my car battery (lead battery) as input 12.8v and my 48v ebike battery as output (load). what happens if I set the uvp to 12.3v.

12.3v meets 54v
Can electricity also flow back?

[sll]

Hello, I appreciate the in-depth videos. I bought a couple of these to use as a DIY double conversion UPS. I just have a problem with these 1800W boost converters, I keep blowing them up. I'm wondering what's the issue if maybe you know. If I use a CC/CV input like 52V/2A and no load on the output, I can get them to turn on and adjust the output voltage using a multimeter. However, for two units I tried to connect the input directly to my 48V lifepo4 battery with no output load and they instantly blew up. For other two units that have blown, they were on a DC PSU at 60V/20A but they didn't seem to completely blow up, they just ended up with input short, presumably due to the FET blowing short. I need to be able to turn these on and off with the high current source like battery and with low load like my inverter with no load. Is it possible that the inrush current is too much from the batteries? Is it possible that not having a load is causing the voltage to rise infinitely? Do I need some kind of soft start circuit on the input to slowly charge the capacitors? Do I need some dummy resistor always connected on the output? Any ideas would be greatly appreciated. Thank you!

[dexterousx]

*I have watched this video twice now. You have some great information here and i really appreciate you sharing it . I have a question. How do we know what size boost converter do we need for our project. What determines if the converter is suitable. My input and output voltage falls within the range. What else is important to know if it works?*

[leratomotsei]

Very informative experiment. However, due to low input voltage at high power consumption we therefore draw more current that results in I2R losses (heat) hence the drop in effeciency the higger you go. Best system is higg voltage at low current and constant power. Perhaps next experiment should be where you adjust current and leta see how effeciency compares

[dalenassar]

At about timestamp 7:29 I noticed that you were turning the UVP pot a bit fast when the LED came on. If you turn back a bit until the UVP LED just "barely" starts to turn on wouldn't you get a more precise 20.0v trigger setting?
THANKS MUCH!

[curtchase]

OK, which way did you turn the pot to lower the threshold for low voltage cutoff? I would guess turning CCW would lower threshold (lower voltage). Right?

[maroxG]

Greeting! Very educational videos!!! Well done Professor! Which converter would you recommend to make a power supply with DC input and output~ 4-6V and ~8-12A adjustable ! That it can work without interruption and overheating for a long time!

[raylivengood]

Yes, thank you for the video. I’ll have to give your example a try for the UVP.

Also- are you selling any of those holder’s ? 😁

[philippedeschenes]

Very informative video. Thanks. I was able to hook up a boost converter from a source battery (42 volts) to a 48 volt inverter successfully. Quick question for you: are you using PLA for your support and casings? If so, don't you fear it might somehow melt if the temperature increases?

[naturetoday]

Please tell me under voltage potentiometer (1200watt )substitute
How many k it rated. My pot damaged. This pot not available here

[mikev]

What's the efficiency at 13v input to 48v output?

[roghibashfahani]

hello sir, is it possible if battery 12v 9A boost to 24V 20A. or is there any boost converter like that ?

[perdonomai]

Nice! What about GaN DC DC Converter that could achieve much better efficiency (95+%) ?

[null]

Just order one switching transistor and solder it parallel with the main switching transistor and efficency will go up👍