MUMBAI, India, Feb. 6 -- Intellectual Property India has published a patent application (202541121485 A) filed by Nandha Engineering College, Erode, Tamil Nadu, on Dec. 4, 2025, for 'smart inrush current limiter using mosfet based soft start control for solar inverter loads.'
Inventor(s) include C Pratheeba; T Kaviya; TK Sanjaiy; and K Niranjankumar.
The application for the patent was published on Feb. 6, under issue no. 06/2026.
According to the abstract released by the Intellectual Property India: "The innovation introduces an active MOSFET-based inrush limiting and soft-start system for solar inverter DC-link applications, replacing conventional resistor or NTC recharge methods with a precise, semiconductor-controlled approach. A pass MOSFET and controller generate a controlled drain/load-node voltage ramp, defining inrush current to ensure predictable surge control across varying load conditions. A decoupled ramp network independently sets the slew rate, enabling rapid fault response and avoiding the limitations of RC gate soft-start circuits. Integrated protections such as undervoltage/overvoltage lockout, active current limiting via a sense resistor, fast overcurrent detection, and a programmable circuit-breaker timer maintain MOSFET safe operating area during faults. After recharge, a bypass relay or low-RDS(on) MOSFET engages to minimize conduction losses in steady state. The design supports unidirectional or bidirectional power paths, offers programmable parameters for different DC-link capacitances and PV/battery ratings, and maintains consistent startup behavior over temperature and source variations. By shaping the voltage ramp and coordinating with inverter PWM sequencing, it reduces EMI and prevents upstream nuisance trips, while enabling fast, safe restarts without thermistor cool-down delays resulting in a compact, efficient, and reliable inrush management solution for solar and UPS power systems."
Disclaimer: Curated by HT Syndication.
