Here's a boost converter typically found on Ebay:
Product says: 150W 8A DC 8-32V to 9-46V 12 24 36 step up BOOST converter Laptop pc car power
Can anyone please explain what's preventing me from doing these:
1. Replacing the diode and output capacitors with higher voltage rating
2. Changing the feedback voltage divider ratio by getting higher value trimpot
to obtain B+ as high as 250-300 volts?
I plan to supply the module with 12V from ATX computer PSU. The module must be able to supply 100-200mA of current.
Product says: 150W 8A DC 8-32V to 9-46V 12 24 36 step up BOOST converter Laptop pc car power
An externally hosted image should be here but it was not working when we last tested it.
Can anyone please explain what's preventing me from doing these:
1. Replacing the diode and output capacitors with higher voltage rating
2. Changing the feedback voltage divider ratio by getting higher value trimpot
to obtain B+ as high as 250-300 volts?
I plan to supply the module with 12V from ATX computer PSU. The module must be able to supply 100-200mA of current.
The one i saw that fits the requirement is a one-off item, and not as cheap as these mass produced converters. Or perhaps my Ebay keyword imagination is lacking? Nixie tube power supplies can reach the voltage i need but judging from the puny inductor size, i dont think it fits the current requirement part.
Last edited:
www. ebay.com/itm/DC-DC-Converter-Boost-10-32V-to-60-90V-100W-Step-Up-Voltage-Power-Supply-MAX-2A-/251389244815?pt=LH_DefaultDomain_0&hash=item3a87f7758f
this goes up to 90v. But you would need to change inductor also, for higher voltages
this goes up to 90v. But you would need to change inductor also, for higher voltages
In my experience with Nixie tube supplies is that they are very noisy, as in a high pitched squeel audible from a few feet away. Dont think i would want to try one in an audio circuit. Output current would also be very low, i doubt they would do 100ma.
why do i need to change the inductor for higher voltages? also since most of them use toroids, i can easily rewind the inductors.. i just need to know whether to add or reduce the winding.
most important: you have to replace the mosfet switch with one that can withstand the voltage (vout + vringing) but still support the same peak current
usually HV mosfets have higher Ron, producing more heat - bigger heat spreader
you also have to redesign the snubber on the mosfet (R/C/D)
and finally boost converters over 7x get very inefficient - again more heat
usually HV mosfets have higher Ron, producing more heat - bigger heat spreader
you also have to redesign the snubber on the mosfet (R/C/D)
and finally boost converters over 7x get very inefficient - again more heat
I can suggest an alternative 'ebay type' product that hardly needs any modification - based on a car inverter plug-in product. See thread link for discussion and link to my info on that product and mods.
Any use for laptop chargers 15v - 19v for pedal supplies or amp builds
It's going to be nigh on impossible to convert a simple boost circuit to get 12V to a few hundred volts with many watts of output - because of the fet and diode duty cycles needed and the impractical high voltage and high current requirements for parts.
Any use for laptop chargers 15v - 19v for pedal supplies or amp builds
It's going to be nigh on impossible to convert a simple boost circuit to get 12V to a few hundred volts with many watts of output - because of the fet and diode duty cycles needed and the impractical high voltage and high current requirements for parts.
Last edited:
Yes i gave power inverters a thought as well but ditched the idea since they work at 50-60Hz which is harder to filter (in SET amps, most likely you'll still have to get a choke). Yours seem to work at SMPS freq though.. only drawback is the low watt output. 5 watt won't cut it even for mono SET amp. I think yours are not unlike nixie tube supplies.
This is a shocking find trobbins, pun obviously intended. Thanks! So it's unregulated, at 12v it will output 260vdc. I might be able to tweak the 12v supply to 12.5-13v to reach 275-300vdc.
At 14V input it gives 309V output.
So yes if you can tweak your '12VDC' a bit higher. If you can't do it by a feedback setting, then a brute force method may be if it has a 5V supply that is isolated from 12V, then you could add them in series and then drop that '17V' down using diodes, or a simple Mosfet based 'zener'.
So yes if you can tweak your '12VDC' a bit higher. If you can't do it by a feedback setting, then a brute force method may be if it has a 5V supply that is isolated from 12V, then you could add them in series and then drop that '17V' down using diodes, or a simple Mosfet based 'zener'.
- Status
- Not open for further replies.