MUMBAI, India, Feb. 13 -- Intellectual Property India has published a patent application (202541124537 A) filed by Dr. Surya Natarajan, Ernakulam, Kerala, on Dec. 10, 2025, for 'level extendable self balanced switching capacitor converter based single phase multilevel inverter.'
Inventor(s) include Dr. Surya Natarajan.
The application for the patent was published on Feb. 13, under issue no. 07/2026.
According to the abstract released by the Intellectual Property India: "Single-phase four-level inverter and application circuit thereof Country: China Date of Filing: 2015-09-07 15 Compared with a traditional diode-clamped and capacitor-clamped multilevel topology, the invention provides a single-phase four-level inverter and an application circuit thereof. The circuit is simple, the system cost is low, and the reliability is high. Through different conduction combinations of a switching tube unit, a clamping capacitor, a first switching tube and a second switching tube, different conduction combinations can be chosen for different control objectives on the premise of 20 same output voltage of the single-phase four-level inverter. Flexible control is achieved. For applications such as defense, medical equipments, and high-precision drives, where superior harmonic performance is crucial, extending the levels of MLIs is desirable. Higher- level MLIs produce output voltages with reduced harmonic content, thereby meeting power quality standards. The proposed topology allows for the generation of any number of voltage levels using a single de source. To achieve any desired voltage level, only three switches in the MLI need to conduct. Furthermore, fewer basic switched-capacitor cells are required to achieve boosted voltage levels. The switched-capacitor cells used in this topology arc highly modular in nature. The same SC cells are connected in parallel for increasing the voltage levels of the multilevel inverter. Voltage balancing of the level capacitors can be achieved without the need for complex control methods. The extended topology facilitates high voltage boosting while providing virtual isolation between the source and the load. A key advantage of this extended multilevel inverter topology is its simplicity in design and ease of implementation."
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