Artlav
Full Member level 2
Greetings.
I'm designing a boost converter to power neon bulbs and such from a battery.
9VDC input, 180-220VDC output.
I'd like to know how much sense this design makes, and in which ways can it be optimised or improved.
Also, what kind of power output can i expect from this kind of a converter?
Mosfet gets hot at about 2-3W already.
Timer runs at 50 kHz with 98% duty cycle, 2Ω resistor inserted to measure current, there is a 300µF capacitor at the input.
With a neon bulb:
Pin=0,81W
Pout=0,53W
Iout=2,45mA
Efficiency=65%
With 16.6k resistor:
Pin=2,43W
Pout=1,9W
Iout=10,6mA
Efficiency=78%
Issues:
-Gets hot over 2W output
-Want to improve overall efficiency and/or low efficiency with small loads
One thing i can not tell if it's bad or normal is the spikes in the current on the inductor and it's reversal, as measured across the 2Ω resistor between the mosfet and the ground.
With a neon bulb:
With the resistors:
Then, the mosfet is warming up quickly at about 2W on output, but is still quite cold with 1.3W.
The gate is opening quick, thanks to the driver (200ns/square):
I'm designing a boost converter to power neon bulbs and such from a battery.
9VDC input, 180-220VDC output.
I'd like to know how much sense this design makes, and in which ways can it be optimised or improved.
Also, what kind of power output can i expect from this kind of a converter?
Mosfet gets hot at about 2-3W already.
Timer runs at 50 kHz with 98% duty cycle, 2Ω resistor inserted to measure current, there is a 300µF capacitor at the input.
With a neon bulb:
Pin=0,81W
Pout=0,53W
Iout=2,45mA
Efficiency=65%
With 16.6k resistor:
Pin=2,43W
Pout=1,9W
Iout=10,6mA
Efficiency=78%
Issues:
-Gets hot over 2W output
-Want to improve overall efficiency and/or low efficiency with small loads
One thing i can not tell if it's bad or normal is the spikes in the current on the inductor and it's reversal, as measured across the 2Ω resistor between the mosfet and the ground.
With a neon bulb:
With the resistors:
Then, the mosfet is warming up quickly at about 2W on output, but is still quite cold with 1.3W.
The gate is opening quick, thanks to the driver (200ns/square):