ngen33r
Newbie level 6
I need to design a power supply that will regulate 35A CC. The proposed input power is 3PH 70VAC 2800ARMS off the secondary off a 480V transformer. I need a little guidance to get on the correct path to base a design. Application is industrial equipment.
I have 2 input power options: Use the transformer secondary or use mains input.
If I use mains input the range is 200VAC-575VAC
If I use the secondary winding the range is 60VAC-140VAC (85VDC-265VDC) 70VAC nominal but I need to account for user miswiring in the primary, AKA feeding 480V into the 220V tap. The system has an OVLO but that would not protect this supply.
Required Output is ~35VDC @ 35A with a duty cycle of 10%
I am leaning towards a Push Pull design but not sure the best way to drive it and regulate the output. Should I go with a self resonant design with a closed loop chopper on the output or a IC based design such as the LM5030.
I have seen some interesting designs in the Audio world that use self resonant push pull driving 2 parallel ETD39 transformers at 1000W output, but not sure if that is the correct path to take. The main requirement is that the supply is isolated from the mains so I don't have any sneek paths for the 2800A to wreak havok on.
Any experienced feedback is appreciated. I know I have a lot to learn.
I have 2 input power options: Use the transformer secondary or use mains input.
If I use mains input the range is 200VAC-575VAC
If I use the secondary winding the range is 60VAC-140VAC (85VDC-265VDC) 70VAC nominal but I need to account for user miswiring in the primary, AKA feeding 480V into the 220V tap. The system has an OVLO but that would not protect this supply.
Required Output is ~35VDC @ 35A with a duty cycle of 10%
I am leaning towards a Push Pull design but not sure the best way to drive it and regulate the output. Should I go with a self resonant design with a closed loop chopper on the output or a IC based design such as the LM5030.
I have seen some interesting designs in the Audio world that use self resonant push pull driving 2 parallel ETD39 transformers at 1000W output, but not sure if that is the correct path to take. The main requirement is that the supply is isolated from the mains so I don't have any sneek paths for the 2800A to wreak havok on.
Any experienced feedback is appreciated. I know I have a lot to learn.