Improved Switching Loss for Single-Phase H-Bridge Boost Inverter Configuration
Corressponding author's email:
tridd@hcmute.edu.vnDOI:
https://doi.org/10.54644/jte.2025.1641Keywords:
Switching loss, DC-AC converter, H-bridge, Boost converter, Film capacitorAbstract
This paper presents the configuration of a single-phase H-bridge boost inverter circuit controlled by an algorithm that can reduce switching losses on power switches. The configuration combines a three-level boost DC - DC converter and a single-phase H-bridge inverter. Different from the conventional algorithm, where the voltage behind the DC - DC boost converter is maintained at a constant level. The paper proposes a solution in which the DC-link voltage control technique supplied to the inverter can be changed in two modes. In buck mode, the input DC voltage is higher than the output voltage, and then only the switches on the inverter side operate to create the output voltage. In boost mode, the input DC voltage is lower than the output voltage, and the semiconductor switches of the boost DC - DC converter control the DC-link voltage equal to the output voltage. From there, the number of switching times as well as the voltage stress applied to the semiconductor switches can be reduced. Thereby improving efficiency compared to conventional algorithm. In addition, using film capacitors instead of electrolytic capacitors makes the inverter more efficient and reliable. To verify the advantage of reducing switching losses, power loss analysis simulation results were performed using PSIM software.
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