My latest project is a bikelamp using 7 of these (http://www.led-tech.de/de/High-Powe...2-auf-Kupfer-Rundplatine-LT-1847_120_117.html) XM-L copper boards and this (http://www.led-tech.de/de/High-Powe...en/CREE-7-Fach-Linse-12°-LT-1730_106_108.html) optic. The maximum power is about 570W, 350W is the maximum continous output with watercooling.
The power supply is a very simple boost-converter for a input voltage of 24-40 VDC (8s LiPo or 10s LiFePO4) and a output voltage of 190V maximum (limited, using 200V Fet and Diode) with 600W maximum output power. The Efficiency is greater than 95% in the range of 40W-300W and greater 90% in the range 10W-500W. The current output of the converter is controlled by a 0-5V signal fron a digital control. The control unit displays the battery voltage, the status of liquid cooler (pump on or off), the measures lamp power and the LED temperature calculated by the forward voltage and current. For this measurement it is necassary to calibrate the lamp at about 25°C lamp temperature from time to time (when you see that the tempereature display has a big difference to the real temperature) but it works very well. The water temperature at 350W is about 10-15 degrees lower than the LED-Temperature, this is a very good value and is due to the copper board.
Here a short video:
best regards
Thomas
The power supply is a very simple boost-converter for a input voltage of 24-40 VDC (8s LiPo or 10s LiFePO4) and a output voltage of 190V maximum (limited, using 200V Fet and Diode) with 600W maximum output power. The Efficiency is greater than 95% in the range of 40W-300W and greater 90% in the range 10W-500W. The current output of the converter is controlled by a 0-5V signal fron a digital control. The control unit displays the battery voltage, the status of liquid cooler (pump on or off), the measures lamp power and the LED temperature calculated by the forward voltage and current. For this measurement it is necassary to calibrate the lamp at about 25°C lamp temperature from time to time (when you see that the tempereature display has a big difference to the real temperature) but it works very well. The water temperature at 350W is about 10-15 degrees lower than the LED-Temperature, this is a very good value and is due to the copper board.
Here a short video:
best regards
Thomas