Andytester
- Aug 14, 2014
- 10
- Joined
- Aug 14, 2014
- Messages
- 10
Hi All
This is my first post, hope it makes sense. I'm trying to test some 26-28v batteries for load capacity and I'm hoping to use this simple circuit to provide a 10A DC constant current load. I've used this circuit successfully for a while testing some 7v NiCd Battery's at 5A, but if I attach a 27v battery I blow the mosfet. I'm just a novice at electronics so can only use very basic maths but I'm wondering if I need to add protection the Gate of the Mosfet, or add an extra Mosfet as per dotted line?
As I understand it the Mosfet will take 30A and accept up to 20v on the gate so not sure what I need to do to make this survive a 27v load.
Thanks
successfully
This is my first post, hope it makes sense. I'm trying to test some 26-28v batteries for load capacity and I'm hoping to use this simple circuit to provide a 10A DC constant current load. I've used this circuit successfully for a while testing some 7v NiCd Battery's at 5A, but if I attach a 27v battery I blow the mosfet. I'm just a novice at electronics so can only use very basic maths but I'm wondering if I need to add protection the Gate of the Mosfet, or add an extra Mosfet as per dotted line?
As I understand it the Mosfet will take 30A and accept up to 20v on the gate so not sure what I need to do to make this survive a 27v load.
Thanks

