MOSFET-Controlled NTC Bypass
Budget: $10 – $30 USD
I need a compact RC timing network that drives a MOSFET to short-out an NTC after start-up so the circuit acts as an inrush-current limiter only for the first few hundred milliseconds. The system runs from a 110 V DC bus and the load can draw up to 10 A once the bypass closes.
Your task is to select suitable parts, calculate the RC values that give a clean, repeatable hand-over, and show how the MOSFET gate is protected against the high dV/dt on the bus. I’d like the work delivered as:
• Schematic (PDF or KiCad).
• Brief calculation sheet or annotated simulation showing how you arrived at the delay and confirming the inrush profile.
• Short parts list with readily available components.
I can validate the design on my bench, so please keep the explanation concise but complete enough that I can reproduce your results.
Your task is to select suitable parts, calculate the RC values that give a clean, repeatable hand-over, and show how the MOSFET gate is protected against the high dV/dt on the bus. I’d like the work delivered as:
• Schematic (PDF or KiCad).
• Brief calculation sheet or annotated simulation showing how you arrived at the delay and confirming the inrush profile.
• Short parts list with readily available components.
I can validate the design on my bench, so please keep the explanation concise but complete enough that I can reproduce your results.