LOSS MITIGATION AND EFFICIENCY ENHANCEMENT IN CASCADED H-BRIDGE MULTILEVEL INVERTERS THROUGH INDUCTIVE DECOUPLING.

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Bibliographic Details
Title:	LOSS MITIGATION AND EFFICIENCY ENHANCEMENT IN CASCADED H-BRIDGE MULTILEVEL INVERTERS THROUGH INDUCTIVE DECOUPLING.
Authors:	K. S. R., DEEPIKA¹, S. K., ABDUL AHAD², R., SRINIVASA RAO³
Source:	i-Manager's Journal on Electrical Engineering. Mar2026, Vol. 19 Issue 3, p61-80. 20p.
Subjects:	Electric power conversion, Power electronics, Energy dissipation, Alternating current electric motors, Electric testing
Abstract:	This cascaded h-bridge multilevel structure is designed to balance cost and efficiency. A key problem in such H-bridge inverters is the high switching loss that arises when the SiC-MOSFET turns on against a silicon diode. This causes large turnoff losses in the silicon diode due to stored bipolar charge carriers. To solve this issue, the paper introduces an inductive decoupling concept. Small additional inductors are placed between the SiC-MOSFET half bridge and the IGBT with silicon diode half bridge. These inductors reduce the electrical interaction between the two branches during switching events. As a result, the turn-on losses of the active SiC-MOSFET and the turn-off losses of the passive silicon diode are greatly reduced. This leads to lower total inverter losses compared to a conventional non-decoupled cascaded Hbridge multilevel inverter. Double pulse tests are used to accurately measure switching losses. While a cascaded Hbridge multilevel inverter setup is used to validate system-level behaviour with closed loop AC motor load conditions. The proposed inductive decoupling reduces the total switching energy per event from approximately 420 µJ to 260 µJ. This corresponding to a reduction of about 38% compared with the conventional coupled hybrid inverter. This allows reorganization of an optimal value for the decoupling inductance. The performance results show that inductive decoupling improves average efficiency during realistic vehicle operation with proposed approach. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This cascaded h-bridge multilevel structure is designed to balance cost and efficiency. A key problem in such H-bridge inverters is the high switching loss that arises when the SiC-MOSFET turns on against a silicon diode. This causes large turnoff losses in the silicon diode due to stored bipolar charge carriers. To solve this issue, the paper introduces an inductive decoupling concept. Small additional inductors are placed between the SiC-MOSFET half bridge and the IGBT with silicon diode half bridge. These inductors reduce the electrical interaction between the two branches during switching events. As a result, the turn-on losses of the active SiC-MOSFET and the turn-off losses of the passive silicon diode are greatly reduced. This leads to lower total inverter losses compared to a conventional non-decoupled cascaded Hbridge multilevel inverter. Double pulse tests are used to accurately measure switching losses. While a cascaded Hbridge multilevel inverter setup is used to validate system-level behaviour with closed loop AC motor load conditions. The proposed inductive decoupling reduces the total switching energy per event from approximately 420 µJ to 260 µJ. This corresponding to a reduction of about 38% compared with the conventional coupled hybrid inverter. This allows reorganization of an optimal value for the decoupling inductance. The performance results show that inductive decoupling improves average efficiency during realistic vehicle operation with proposed approach. [ABSTRACT FROM AUTHOR]
ISSN:	09738835
DOI:	10.26634/jee.19.3.1128