dc dc cnverters, 12-80V -- where??

There is no shortage of $1-2 dc-dc converters for up to about 36V, ~10w total power output,

but don't see many going at least to 60V, which gets into normal batteries that we're using on ebikes.

Anyone know of some equivalents of these, with a slightly wide input voltage range? Just for powering some other "things" on the bike, like a USB port, or etc.

http://www.ebay.com/itm/DC-DC-4-2-40V-to-3-3V-5V-6V-9V-12V-24V-Buck-Step-Down-Converter-Linear-Regulator-/322365124189

Thanks

I just googled it:

https://www.amazon.com/VOLTAGE-REDUCER-CONVERTER-30V-100V-20Amax/dp/B00M6NWVTM

If you want a specialty item, you might have to give up on mass market prices.

Just a couple of weeks ago, I bought a 48V-12V 10A converter on eBay for $11 shipped, from a USA supplier.

I've done a lot of research into DC-DC converters, what is your exact voltage range and what amp draw do you want to use and I can recommend.

But for a cheap one that works at high voltage, this is the one I recommend from this supplier.

https://www.aliexpress.com/item/E-bike-DC-DC-Converter-24V-36V-48V-60V-72VDC-universal-to-12VDC-10A-72V-Electric/522806594.html?spm=a2g0s.9042311.0.0.eRQhN3

I used this one to power my cooling system and lights, this thing surprisingly works if placed outside the bike and at high amps it just keeps going. I've pushed it to 8-10 amps sometimes and it just doesn't die. It will get hot so don't expect to use it at over 5 amps or so and place it inside the bike frame. Placing a controller or anything thing inside the bike frame or bag is just stupid and without air flow will overheat very quickly.

I know of more high end DC-DC converters, but those will cost $100-200 dollars. They will push high amps and are very small and light weight.

The problem is that 72 input volts seems to not be very common when it comes to DC-DC converters so there are really not many options out there.

Element 14, Digikey, all have several options for voltages from 40 to 75 V, and 60 to 120 V DC to 12 V DC.
Not crazy power, but 3 to 10 W is normal.

For the 10 W range, you can use an AC adapter - anything from a laptop power supply down to an iphone charging cube. Just check the output ratings. It has to be a switch-mode supply, not the older transformer type, but anything made in the last 15 years or so should work. Some of these won't work below a certain voltage, but ~60 V probably won't be a problem, and some of them will work with one polarity but not the other. You might have a dozen or so lying around the house so experiment until you find one that works.

Likely need a few converters to do what you need, at least two. I would recommend a low power 5V supply. This is good for controlling stuff in standby. A high power 12V supply for lights. 12V supply is biased by 5V supply for best efficiency.
BD9G341AEFJ
Is 76V in and 3A rated. Not many available above this voltage with internal transistor.

A fly back topology may be best to consider. But I figure you weren't looking to build from scratch, definitely not easy.

http://www.ebay.com/itm/172860794791
72v and up is for AC adapters territory.

Thanks for the replies;

the question came from seeing a large range of headlights that are 12-80V compatible, that cost like $4 on ebay.

So surely there must be a similar DC DC over that input range that could get down into the same ~5V output.

I found a few low cost variants that cover the normal ebike 13S-14S range at least,

$1.39 using a lm2596HVS,

http://www.ebay.com/itm/LM2596HVS-DC-DC-Adjustable-4-5-60V-Step-Down-Buck-Converter-Power-Module-/142451693366

$2.17 using lm2576hv

http://www.ebay.com/itm/LM2576HV-Adjustable-Buck-Module-5V-60V-to-1-25V-26V-DC-DC-Step-Down-Module-/162146109697

cv cc version, $2.04

http://www.ebay.com/itm/DC-DC-LM2596-HV-S-60V-3A-Buck-Constant-Current-Voltag-wbr-e-CC-CV-Step-Down-Module-/252674671018

There is also fake LM2596HV-s araound (blow up at ~50V), so be careful.
https://www.youtube.com/watch?v=JLwJb4MVbls

timmy66 said:

the question came from seeing a large range of headlights that are 12-80V compatible, that cost like $4 on ebay.

Click to expand...

Since those LED drivers only need to deliver a single fixed current, they're made to solve a different problem than what you're talking about.