Hi,
I'll like to design a 400V capacitor bank charger from a 230ac line. Ideally, it would charge the capacitors within seconds, which implies in my case a current rate of about 5A, so the charger should deliver a power around 2kW.
As it is for charging capacitors, a big ripple voltage isn't a problem.
Also, outputting a bigger voltage (up to 430V as the capacitors are rated for 450V) is not a problem as I planned to use a voltage comparator to stop the charging when the capacitors reach a desired voltage.
The use of a transformer would be the easy solution, but the cost of such equipment is out of my budget unless you know where to find a large toroidal transformer core relatively cheaply, so then I could wind it myself
I think the a solution would be to build a SMPS, so use a full-bridge rectifier + a capacitor to rectify the AC to a DC, then a boost converter SMPS DC to DC. I was planning to use an old PC power supply + linear regulator to provide the low voltage needed for the SMPS microcontroller.
To limit the current, I was thinking of a resistor sensing + mofset.
What do you think ? Do you have any other solution in mind ?
Also, as I have no experience building such SMTP, I first wondering at which frequency such SMPS should be operated ? (as the higher the frequency the smaller the components but also the higher the losses in the switch)
Thanks
I'll like to design a 400V capacitor bank charger from a 230ac line. Ideally, it would charge the capacitors within seconds, which implies in my case a current rate of about 5A, so the charger should deliver a power around 2kW.
As it is for charging capacitors, a big ripple voltage isn't a problem.
Also, outputting a bigger voltage (up to 430V as the capacitors are rated for 450V) is not a problem as I planned to use a voltage comparator to stop the charging when the capacitors reach a desired voltage.
The use of a transformer would be the easy solution, but the cost of such equipment is out of my budget unless you know where to find a large toroidal transformer core relatively cheaply, so then I could wind it myself
I think the a solution would be to build a SMPS, so use a full-bridge rectifier + a capacitor to rectify the AC to a DC, then a boost converter SMPS DC to DC. I was planning to use an old PC power supply + linear regulator to provide the low voltage needed for the SMPS microcontroller.
To limit the current, I was thinking of a resistor sensing + mofset.
What do you think ? Do you have any other solution in mind ?
Also, as I have no experience building such SMTP, I first wondering at which frequency such SMPS should be operated ? (as the higher the frequency the smaller the components but also the higher the losses in the switch)
Thanks