basit701
Newbie level 6
Hello Guys,
Hope you are doing great.
I was looking for a supply for my boost converter with high current capacity and came across an ATX Computer Power supply. I connected the dummy load of 4.7ohms between +5V and GND and on +12V rail i connected a Car Headlight bulb. After turning on the turning the bulb lit and voltage and current were 11.90V and 7.26A. After ensuring that the supply was able to drive a high current bulb i disconnected the bulb and connected the boost converter across 12V rail and started from the minimum duty cycle. Upon increasing to 60% duty i observed that the current through boost converter using DMM was about 2A and voltage went down to 10V. Upon further increasing the duty cycle the voltage went down to 8.5V and the power supply turned off. I switched off the supply and turned it on after half a minute and same happened.
I am confused now that the supply easily drove the headlight bulb which was taking 7.25A and the voltage were 11.98V but in case of boost converter the voltage dropped to 8.5V at just 2A. Is this because of the pulsating current that boost converter takes as input? (Inductor being switched) If yes then how this can problem can be solved?
Hope you are doing great.
I was looking for a supply for my boost converter with high current capacity and came across an ATX Computer Power supply. I connected the dummy load of 4.7ohms between +5V and GND and on +12V rail i connected a Car Headlight bulb. After turning on the turning the bulb lit and voltage and current were 11.90V and 7.26A. After ensuring that the supply was able to drive a high current bulb i disconnected the bulb and connected the boost converter across 12V rail and started from the minimum duty cycle. Upon increasing to 60% duty i observed that the current through boost converter using DMM was about 2A and voltage went down to 10V. Upon further increasing the duty cycle the voltage went down to 8.5V and the power supply turned off. I switched off the supply and turned it on after half a minute and same happened.
I am confused now that the supply easily drove the headlight bulb which was taking 7.25A and the voltage were 11.98V but in case of boost converter the voltage dropped to 8.5V at just 2A. Is this because of the pulsating current that boost converter takes as input? (Inductor being switched) If yes then how this can problem can be solved?