Lord_grezington
- May 3, 2013
- 124
- Joined
- May 3, 2013
- Messages
- 124
Hi there
I am trying to get a battery charging circuit designed, however as I am not an expert on batteries I have a couple of questions.
1. Can I charge the battery via PWM? IE, 12V lead acid requires 14.4V to charge, so can I use a PWM voltage at a 30% duty cycle (from 48Vdc) without damaging the battery?
1b. Will the same theory apply to lithium batteries?
2. Batteries typically have a low resistance, lets say 1 Ohm. so if I then put 14.4V across it, there will be a current draw of 14.4A (which is too high). I then regulate this current draw to say a 5A max so my PWM signal is now @ 10.4% (of my 48V).
2b. Will by battery now stop charging because my voltage is not high enough?
Thanks
Graham
I am trying to get a battery charging circuit designed, however as I am not an expert on batteries I have a couple of questions.
1. Can I charge the battery via PWM? IE, 12V lead acid requires 14.4V to charge, so can I use a PWM voltage at a 30% duty cycle (from 48Vdc) without damaging the battery?
1b. Will the same theory apply to lithium batteries?
2. Batteries typically have a low resistance, lets say 1 Ohm. so if I then put 14.4V across it, there will be a current draw of 14.4A (which is too high). I then regulate this current draw to say a 5A max so my PWM signal is now @ 10.4% (of my 48V).
2b. Will by battery now stop charging because my voltage is not high enough?
Thanks
Graham