Hi folks, I need some help with making a choke
I am using an inverter based power current source, a welder, to charge a large battery bank.
With no additional parts I was getting about 800mV ripple at 75Khz when the current is between 30 and 70 amps.
In an attempt to reduce this I wound a choke using appliance wire on a torroid core I had which reduced the ripple to about 300mV.with a current of 50A or so.
I couldnt run much more current than that because it gets alarmingly hot due to the wire size I had available.
The core is 75mm OD / 55mm ID and 25mm deep, it has 20 turns of 6mmSq wire on it.
It appears to be a spiral of thin flat material covered in a protective plastic coating
(Its an old 24v transformer core)
How can I work out what value this choke is?
How much bigger will it need to be to reduce the ripple to 50mV?
Will the core and windings contribute to heating, or is it simply the wire size causing the problem?
Since I want to block 750mV at 75A will I be dissipating circa 60W or is some of that energy pushed back into the circuit?
Is a torroid the best way to go and would a ferrite one be any better requiring fewer turns?
Looking forward to being educated, thanks,
Alistair
I am using an inverter based power current source, a welder, to charge a large battery bank.
With no additional parts I was getting about 800mV ripple at 75Khz when the current is between 30 and 70 amps.
In an attempt to reduce this I wound a choke using appliance wire on a torroid core I had which reduced the ripple to about 300mV.with a current of 50A or so.
I couldnt run much more current than that because it gets alarmingly hot due to the wire size I had available.
The core is 75mm OD / 55mm ID and 25mm deep, it has 20 turns of 6mmSq wire on it.
It appears to be a spiral of thin flat material covered in a protective plastic coating
(Its an old 24v transformer core)
How can I work out what value this choke is?
How much bigger will it need to be to reduce the ripple to 50mV?
Will the core and windings contribute to heating, or is it simply the wire size causing the problem?
Since I want to block 750mV at 75A will I be dissipating circa 60W or is some of that energy pushed back into the circuit?
Is a torroid the best way to go and would a ferrite one be any better requiring fewer turns?
Looking forward to being educated, thanks,
Alistair