m_seifi_e
Newbie level 4
Hello Guys
I created nearly the same topic in microcontroller section of this forum , but not exactly the same question here ...
the other topic Here
If its illegal,please delete it
I'm making a high Power LED stroboscope that uses 2*10 watt LEDs Driven by micro controller with digitally controllable frequency and duty percent .
But my problem is :
for making a high speed rotary device look "still" , the duty percent should be lowered below 2% ( as experience ). and as you know with this low Duty the light intensity is so weak .
I know that with much more current the brightness can be multiplied , but with a 10-12 volt forward voltage LED the power supply should be multiplied by a factor of 50 ( 2% Duty) , which means 500-600 volts!, and i cant supply such a voltage nor LED can handle even 20% of it!( is it true at all?)
( I get about 5 mA with LED directly connected to a 20 A - 12V Computer power supply without any current limiting equipment , while strobing with 60Hz,1% Duty ) - and i cant even think about high voltage transformer circuits like the one used in crt TVs - and i couldn't find any step up regulator to do the job
Is there a specific type of circuit to do the job with a "high current capable but low voltage power supply" ?
I asked in uController section about a design that can be dynamically change this pumping current ( as duty percent incremented , the current lowered ) - but any help with analog design of such a circuit appreciated
thank you very much and sorry for my poor english - you are the best
I created nearly the same topic in microcontroller section of this forum , but not exactly the same question here ...
the other topic Here
If its illegal,please delete it
I'm making a high Power LED stroboscope that uses 2*10 watt LEDs Driven by micro controller with digitally controllable frequency and duty percent .
But my problem is :
for making a high speed rotary device look "still" , the duty percent should be lowered below 2% ( as experience ). and as you know with this low Duty the light intensity is so weak .
I know that with much more current the brightness can be multiplied , but with a 10-12 volt forward voltage LED the power supply should be multiplied by a factor of 50 ( 2% Duty) , which means 500-600 volts!, and i cant supply such a voltage nor LED can handle even 20% of it!( is it true at all?)
( I get about 5 mA with LED directly connected to a 20 A - 12V Computer power supply without any current limiting equipment , while strobing with 60Hz,1% Duty ) - and i cant even think about high voltage transformer circuits like the one used in crt TVs - and i couldn't find any step up regulator to do the job
Is there a specific type of circuit to do the job with a "high current capable but low voltage power supply" ?
I asked in uController section about a design that can be dynamically change this pumping current ( as duty percent incremented , the current lowered ) - but any help with analog design of such a circuit appreciated
thank you very much and sorry for my poor english - you are the best