Hello there,
I have made a DC-DC converter which (my aim was) steps 72V to 12V. I have used a 555 IC to drive a MOSFET (IRF540N). I have made the circuit in LTspice first and it works! (24khz and 17% duty cycle). I added an inductance (0.01mh real world value for a wire and a bulb?!?) and resistance (6ohm) to see how it works under load... I added a resistor to the gate (0-1kpot) to slow down the rate of change and limit spikes.
I the 'real world' however I have exploded 3 bulbs and showered myself in glass... exciting!!! (viva la safety goggles).
I have since reduced the duty cycle to a point where the 12V bulbs no longer explode and tested it with my multi meter. I have now got 6.9VDC and 14.3VAC... Why is there so much AC?
I have made a DC-DC converter which (my aim was) steps 72V to 12V. I have used a 555 IC to drive a MOSFET (IRF540N). I have made the circuit in LTspice first and it works! (24khz and 17% duty cycle). I added an inductance (0.01mh real world value for a wire and a bulb?!?) and resistance (6ohm) to see how it works under load... I added a resistor to the gate (0-1kpot) to slow down the rate of change and limit spikes.
I the 'real world' however I have exploded 3 bulbs and showered myself in glass... exciting!!! (viva la safety goggles).
I have since reduced the duty cycle to a point where the 12V bulbs no longer explode and tested it with my multi meter. I have now got 6.9VDC and 14.3VAC... Why is there so much AC?