Hi Guys,
I am after some thoughts on my circuit design. I want to build a circuit board for switching between batteries for both charging and discharging some SLA batteries.
For simplicity I have omitted irrelevant parts of the circuit design for my question.
I was wondering if there is something simpler out there or if I'm going crazy going down a wrong path. I want to be able to charge and discharge batteries with a max of about 10-15 amps. The issue i have found driving the circuitry with MOSFETs are, the 2 mosfets with common source (or drain) have too much of a voltage drop across the body diode to handle that kind of current. While having the driving mosfets in parallel means battery can undesirably self-discharge or charge through the body diode.
I have come to a solution, but i was wondering if there is a better or easier way. I originally went with relays but I thought they consume over a watt running the coil. I know there are some mosfets that can operate in the mOhm rds (on) range, but im relatively inexperienced with BJTs.
I guess i just want to know if my idea is bad or not. I know IGBTs are meant to do what im trying to do here, in a single package, but i cant seem to find the right one.
I am after some thoughts on my circuit design. I want to build a circuit board for switching between batteries for both charging and discharging some SLA batteries.
For simplicity I have omitted irrelevant parts of the circuit design for my question.
I was wondering if there is something simpler out there or if I'm going crazy going down a wrong path. I want to be able to charge and discharge batteries with a max of about 10-15 amps. The issue i have found driving the circuitry with MOSFETs are, the 2 mosfets with common source (or drain) have too much of a voltage drop across the body diode to handle that kind of current. While having the driving mosfets in parallel means battery can undesirably self-discharge or charge through the body diode.
I have come to a solution, but i was wondering if there is a better or easier way. I originally went with relays but I thought they consume over a watt running the coil. I know there are some mosfets that can operate in the mOhm rds (on) range, but im relatively inexperienced with BJTs.
I guess i just want to know if my idea is bad or not. I know IGBTs are meant to do what im trying to do here, in a single package, but i cant seem to find the right one.
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