Hello!
There is a need for a quite powerful battery charger, which wouldn't mind helping at the motor starting moment too. That would mean a regulated output voltage of 14.4V and max current of 30A. It would be very nice, if the output voltage could be isolated from all the rest of the circuit- voltage regulation feedback through an optocoupler perhaps, and the current sense via the primary winding- when the max current is reached, the output voltage may drop to maintain the current. I'm sure, it can be done, but not with my own knowledge . I have searched for a proper schematic for almost a week now, but with no real success.
What I have (or will have in a 3 weeks time) from the main parts, which could be used: UC3843; TL494; SG3525; IR2153; IR2110; TL431A. And, of course, an unknown type of ferrite core EE type 42x42x19.5mm outside and 12x19.5mm core. Would it be sufficient for this much required power? According to some SMPS calculators, it should be, but what about the real life?
Calculated windings for a 200-240VAC supply and a half bridge configuration at 50kHz should be Primary-23(0.6x3 wires) + Secondary-3+3(0.6x14 wires). Not sure, if they would fit, though.
Please, share your thoughts about this.
Edit: Some of the possible circuits I found for modification:
There is a need for a quite powerful battery charger, which wouldn't mind helping at the motor starting moment too. That would mean a regulated output voltage of 14.4V and max current of 30A. It would be very nice, if the output voltage could be isolated from all the rest of the circuit- voltage regulation feedback through an optocoupler perhaps, and the current sense via the primary winding- when the max current is reached, the output voltage may drop to maintain the current. I'm sure, it can be done, but not with my own knowledge . I have searched for a proper schematic for almost a week now, but with no real success.
What I have (or will have in a 3 weeks time) from the main parts, which could be used: UC3843; TL494; SG3525; IR2153; IR2110; TL431A. And, of course, an unknown type of ferrite core EE type 42x42x19.5mm outside and 12x19.5mm core. Would it be sufficient for this much required power? According to some SMPS calculators, it should be, but what about the real life?
Calculated windings for a 200-240VAC supply and a half bridge configuration at 50kHz should be Primary-23(0.6x3 wires) + Secondary-3+3(0.6x14 wires). Not sure, if they would fit, though.
Please, share your thoughts about this.
Edit: Some of the possible circuits I found for modification:
Attachments
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