Buck or boost converter that ramps up and down
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Macgravy
Newly Enlightened
I, for one, need some additional information. You stated "Output power up to about 10A". Output power is measured in Watts. This is Output Current. So you need a converter that has a capibility of providing 10 Amps of current. Now we need the voltage input & output range? Thanks.
Sorry for the confusion. I'm not real limited on range, depends whether it is buck or boost. Say 6v to 30v input and 6v to 30v on output. Any variation outside that range would be better. I'm thinking about 300W capability. I don't have a specific project in mind, I will base it on what is available in converters.
Not just a converter, but an extremely universally applicable charger: Junsi iCharger X6:
But can at the input from 7 to 32V up to 35A; at the output 2 to 26.5V up to 30A (max. 800W).
Can also charge, discharge and store all common battery chemistries. And has a display that shows all important data on one screen.
But can at the input from 7 to 32V up to 35A; at the output 2 to 26.5V up to 30A (max. 800W).
Can also charge, discharge and store all common battery chemistries. And has a display that shows all important data on one screen.
Let's approach this slightly differently. I am trying to power a portable light. I have found the following converters on ebay. All of them would work for what I am planning, but none of them have the ramp up and down feature. I need someone to tell me how to add the ramping feature to one of these, or recommend a similar converter that already has the ramping feature.
https://www.ebay.com/itm/275369682429
https://www.ebay.com/itm/2854592413...oEer27+iMrPAZ01UP1kHNOmw==|tkp:Bk9SR4ys2MTfYg
https://www.ebay.com/itm/3746782613...JYXjuu3qNk5P4EnmxYN14XK8w=|tkp:Bk9SR4isvsXfYg
https://www.ebay.com/itm/275369682429
https://www.ebay.com/itm/2854592413...oEer27+iMrPAZ01UP1kHNOmw==|tkp:Bk9SR4ys2MTfYg
https://www.ebay.com/itm/3746782613...JYXjuu3qNk5P4EnmxYN14XK8w=|tkp:Bk9SR4isvsXfYg
Dave_H
Flashlight Enthusiast
A lot of questions:
Specifically what type of lighting are you driving, incandescent, LED, and if latter does it use a driver? What kind of load current?
What ramp up/down times are you looking for, i.e. 1 second, or 5-10 seconds etc. I take it this is for aesthetic purposes?
Depending on the light, ramping its voltage up and down linearly may not produce the result you want.
Are you able to narrow down the input and output voltage ranges? Does it actually need to buck and boost? Those types are typically more complex and expensive than a pure buck or boost converter.
Rather than a special power supply which might require ramping for lab or testing use, it may be easier/cheaper to add a circuit/module between supply and lighting. I don't have specific suggestion at this point.
Looking at the eBay items, I'd be a bit skeptical of some of their specs, at those prices.
What's your budget for all of this?
Dave
A lot of answers.
Incandescent.
Ramp time--don't care
Buck, boost, or buck/boost--don't care
Adding a module would be fine, but I don't know what I need.
Budget--cheap
Just show me some options, then I can decide what I want.
Incandescent.
Ramp time--don't care
Buck, boost, or buck/boost--don't care
Adding a module would be fine, but I don't know what I need.
Budget--cheap
Just show me some options, then I can decide what I want.
Dave_H
Flashlight Enthusiast
What voltage are the lamps designed to run on?
I am thinking a 12v/24v dc lamp dimmer may have this feature, without manually have to dim up and down; but no specific advice.
Dave
Dave_H
Flashlight Enthusiast
Incandescents would require a fixed voltage output supply. A constant-current supply would only work if you can set it to the current corresponding the the lamp wattage e.g. a 24W lamp at 12v is 2A. If you change to different lamp (voltage and/or wattage), current setting would have to be changed. It's not usually done this way. CC is mainly used for LEDs.
Using voltage-output buck converter, its input voltage needs to be higher than the highest voltage of bulb being used.
Unless you can narrow down your input and output requirements, getting a "one-size-fits-all" solution which works correctly for all cases is going to be difficult.
Dave
Using voltage-output buck converter, its input voltage needs to be higher than the highest voltage of bulb being used.
Unless you can narrow down your input and output requirements, getting a "one-size-fits-all" solution which works correctly for all cases is going to be difficult.
Dave
Lamps I am considering are 12v 100W, 24v 250W, 28v 600W and 36v 400W. Say a buck for 12v and 24v, and a boost for 28v and 36v. I will not be changing lamps. I will have one converter/system and lamp for one light. If I want to use a different lamp, it would be in a different light and another converter.
I'm not asking for a one size fits all, just something that will work for one setup.
I'm not asking for a one size fits all, just something that will work for one setup.
Macgravy
Newly Enlightened
Running Incandescents on DC will cut their life by more than 50% if ran at rated voltage....Incandescents rated life is on AC only at rated voltage. Now with that said, you can greatly increase their life by decreasing the voltage source. I use to have those equations handy, but I'm guessing they are on the web somewhere. I think I would just try to find some big transformers and use them. Just 1 more choice to consider.
Low-voltage halogen lamps are already designed to operate with direct current.
But there are types from the same manufacturer with different lifespans.
For example Osram 24V150W:
64640: 50 hours;
64641: 200 hours;
64642: 300 hours;
However, it is still true that the lifespan decreases if the lamps are operated with a little more than the nominal voltage, or increases if the voltage is lower.
But there are types from the same manufacturer with different lifespans.
For example Osram 24V150W:
64640: 50 hours;
64641: 200 hours;
64642: 300 hours;
However, it is still true that the lifespan decreases if the lamps are operated with a little more than the nominal voltage, or increases if the voltage is lower.
Dave_H
Flashlight Enthusiast
OK, understanding better what you are trying to do. What voltage(s) are feeding your convertors, or is that decided?
Running buck for 12v or 24v means input above 24v; and boost for 28v and 36v implies something below 28v, so I'm thinking 26v would work for either case?
Dave
Look no further.
www.taskled.com
TaskLED Home
www.taskled.com
Macgravy
Newly Enlightened
Are you really using Low-voltage halogen lamps?
Also, are you planning to use a power supply to drop the mains voltage to some voltage the converters can use, which brings up the question, Why?
Or are you using something like an couple of automobile batteries wired in series to come up with ~24VDC, thereby you stating the use of buck converter for the 12v and 24v lamps and boost converter for the 28v and 36v lamps. Running a buck converter and trying to maintain 24 volts to the lamp(s) will be difficult on 2 series auto batteries.
Also, are you planning to use a power supply to drop the mains voltage to some voltage the converters can use, which brings up the question, Why?
Or are you using something like an couple of automobile batteries wired in series to come up with ~24VDC, thereby you stating the use of buck converter for the 12v and 24v lamps and boost converter for the 28v and 36v lamps. Running a buck converter and trying to maintain 24 volts to the lamp(s) will be difficult on 2 series auto batteries.
Dave_H
Flashlight Enthusiast
My thought also, two convertors in series, "compound" inefficiency.
I'd also be careful with the specs of some of those cheap er low-cost dc-dc convertor modules from you-know-where, they seem optimistic. 300W at 96% efficiency in a module that size costing less than US$10? Caveat emptor.
Dave
