CrabMan
Member level 1
low voltage transformer problems
Hi all,
I have a problem with my lead acid battery charger that i am working on, I have a Transformer which is converting 220VAC to 30VAC and then there is a bridge rectifier with a capacitor filter, the problem is that at low current the circuit works fine but when i try to get the current above 5Amperes the circuit responds in a weird way, the current flows for around 300msec and then it drops to 0amperes for around 500msec and then starts to flow again, I think the transformer is getting saturated, am i right? and if I am is there a way to solve this problem?
P.S i am using mosfet and driving its gate at a frequency of 30Khz with PWM i have tried and changed the frequency of gate drive from 30Hz to 70KHz but it dosnt works.
Regards,
CrabMan
Hi all,
I have a problem with my lead acid battery charger that i am working on, I have a Transformer which is converting 220VAC to 30VAC and then there is a bridge rectifier with a capacitor filter, the problem is that at low current the circuit works fine but when i try to get the current above 5Amperes the circuit responds in a weird way, the current flows for around 300msec and then it drops to 0amperes for around 500msec and then starts to flow again, I think the transformer is getting saturated, am i right? and if I am is there a way to solve this problem?
P.S i am using mosfet and driving its gate at a frequency of 30Khz with PWM i have tried and changed the frequency of gate drive from 30Hz to 70KHz but it dosnt works.
Regards,
CrabMan