MUMBAI, India, Feb. 6 -- Intellectual Property India has published a patent application (202541121486 A) filed by Nandha Engineering College, Erode, Tamil Nadu, on Dec. 4, 2025, for 'design and implementation of a snubber circuit for mosfet based inverter in an residental ups systems.'
Inventor(s) include V Arun Kumar; K Veeramani; S Dinesh Kumar; and S D Moorthi.
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 design and implementation of a snubber circuit for MOSFET-based inverters in UPS systems involves creating a protective sub-circuit that controls voltage spikes, ringing, and switching transients typical in power electronics. The snubber circuit is crucial for enhancing the reliability and efficiency of MOSFET switches in the inverter stage of the UPS by mitigating the high dv/dt and voltage overshoot caused by rapid switching and inductive load effects. Innovation Abstract in Detail The snubber circuit typically employs an RC (resistor-capacitor) topology placed as close as possible to the MOSFET to minimize parasitic effects. When the MOSFET turns off, the snubber capacitor absorbs the inductive energy that otherwise causes damaging voltage spikes on the MOSFET drain. The resistor then dissipates this energy, preventing high discharge currents back into the device, protecting it from overstress and increasing, device longevity. A key innovative approach in modem UPS MOSFET inverter design is the use of regenerative snubber circuits. Unlike dissipative RC snubbers that waste energy as heat, regenerative circuits recover the energy stored in the snubber capacitor back to the DC bus or supply, thus improving overall system efficiency. This is implemented via auxiliary DC-DC converters operating with zero-voltage switching (ZVS) to achieve soft commutation, reduce losses, and suppress electromagnetic interference. Mathematically, the RC snubber components are carefully selected based on load inductance, MOSFET switching characteristics, and desired damping of voltage transients. The snubber capacitor is sized to absorb the switching energy, while the resistor is sized to limit the discharge current and power dissipation. In high-frequency applications like UPS inverters, this design must balance energy absorption, switching losses, thermal dissipation, and physical size constraints."
Disclaimer: Curated by HT Syndication.
