A High-Efficiency Modulation Method of Two-Stage Inverter with Low Voltage Input and High Voltage Output

doi:10.16183/j.cnki.jsjtu.2022.102

Abstract

Abstract:

Miniaturization, lightweight, and high power density are development trends of vehicle-mounted inverters. The existing vehicle mounted single-phase inverter with DC 110 V input voltage adopts two-stage independent modulation between Boost circuit and full bridge inverter circuit, which has the problems of low efficiency and low power density. To solve these problems, a two-stage cooperative modulation between Boost circuit and full-bridge inverter circuit is studied. According to the relationship between the absolute value of input voltage and output voltage, the Boost circuit and the full-bridge inverter operate with different modes in the proposed method, which optimizes the insulated gate bipolar transistor(IGBT) switching state and diode on-off state to reduce the loss of the inverter and improve the efficiency of the inverter. At the same time, the output harmonics of the full-bridge inverter circuit can be reduced to decrease the size of the filter and improve the power density of the inverter. A 2.75 kV·A prototype is designed and fabricated. Experiments are conducted to verify the correctness and feasibility of the proposed method.

Key words: low voltage input and high voltage output, inverter, two-stage cooperative modulation, power density

CLC Number:

TM464

KUANG Yonghong, XIE Wei, TIAN Li, LIN Yuan, ZHOU Xifeng. A High-Efficiency Modulation Method of Two-Stage Inverter with Low Voltage Input and High Voltage Output[J]. Journal of Shanghai Jiao Tong University, 2023, 57(7): 878-886.

Figures/Tables 10

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调制方式	IGBT 导通损耗	IGBT 开关损耗	二极管导通损耗	二极管反向恢复损耗
两级独立式	31.16	36.95	31.32	16.01
两级协同式	25.97	8.57	29.56	6.90