J
Jamie Morken
Hi,
I have a simulation of multiphase active power factor correction
for a 3.6kW battery charger, that generates a 380VDC bus from
either 120VAC single phase or 240VAC split phase. At 120VAC input
the output power is limited to 1.8kW to keep the required inductor
sizes lower.
There are three phases with each phase having a 75uH/25Amp inductor.
The base PWM frequency for the inductor boost switches is 200kHz,
with the pulses to each switch being offset by 1/3rd of the PWM
period.
Here is the schematic:
http://rocketresearch.nekrom.com/new/multiphasePFC/multiphasePFCschematic.jpg
The only shunt being used for the PFC algorithm is the lowside shunt.
The input filter is just an LC lowpass on the output of the bridge
rectifier. The rectified current ripple is here:
http://rocketresearch.nekrom.com/new/multiphasePFC/60HzinputCurrent.jpg
I haven't been able to really reduce this current ripple to make a nice
signal showing good power factor. What is a better way to hook up a
filter for this type of circuit rather than using the LC filter on the
output of the bridge rectifier?
cheers,
Jamie
I have a simulation of multiphase active power factor correction
for a 3.6kW battery charger, that generates a 380VDC bus from
either 120VAC single phase or 240VAC split phase. At 120VAC input
the output power is limited to 1.8kW to keep the required inductor
sizes lower.
There are three phases with each phase having a 75uH/25Amp inductor.
The base PWM frequency for the inductor boost switches is 200kHz,
with the pulses to each switch being offset by 1/3rd of the PWM
period.
Here is the schematic:
http://rocketresearch.nekrom.com/new/multiphasePFC/multiphasePFCschematic.jpg
The only shunt being used for the PFC algorithm is the lowside shunt.
The input filter is just an LC lowpass on the output of the bridge
rectifier. The rectified current ripple is here:
http://rocketresearch.nekrom.com/new/multiphasePFC/60HzinputCurrent.jpg
I haven't been able to really reduce this current ripple to make a nice
signal showing good power factor. What is a better way to hook up a
filter for this type of circuit rather than using the LC filter on the
output of the bridge rectifier?
cheers,
Jamie