Paralleling multiple Switches (Mosfets) to achieve higher current and power density with significant reduction in power loss for portable battery operated low voltage inverters

Abstract

Abstract: The demand for portable, high-efficiency, low-voltage inverters has escalated with the growing adoption of battery-operated devices in a variety of applications, ranging from consumer electronics to renewable energy systems. This study explores the technique of paralleling multiple MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) in inverter circuits to achieve higher current and power density while significantly reducing power loss. By employing parallel MOSFETs, the current handling capability and thermal management of the inverter are optimized, contributing to better power conversion efficiency and higher overall performance. The work emphasizes how paralleling transistors can mitigate the common challenges faced in low-voltage, high-current applications, such as thermal runaway, excessive heat dissipation, and performance degradation due to high power losses. The research investigates the impact of MOSFET paralleling on inverter efficiency, thermal behavior, and system reliability. Several configurations of parallel MOSFETs were tested, with performance metrics such as power loss, thermal rise, and current distribution across switches analyzed. The results indicate that by carefully selecting and optimizing the number of paralleled MOSFETs, the power loss can be reduced by up to 35%, significantly enhancing the overall energy efficiency of the inverter. Furthermore, the parallel configuration allows for better current sharing, thereby reducing the stress on individual devices and improving their longevity. This paper also discusses the potential trade-offs in paralleling techniques, including challenges related to gate-drive control and switching dynamics, and presents solutions to overcome these issues. The findings demonstrate that the paralleling of MOSFETs is an effective strategy to improve the power density and efficiency of portable battery-operated inverters while minimizing power loss and ensuring long-term system stability.