Abstract
A new circuit structure and control method for a high power interleaved dual-buck inverter are proposed. The proposed inverter consists of six switches, four diodes and two inductors, uses a dual-buck structure to eliminate zero-cross distortion, and operates in an interleaved mode to reduce the current stress of switch. To reduce the total harmonic distortion at low output power, the inverter is controlled using discontinuous-current-mode control combined with continuous-current-mode control. The experimental inverter had a power-conversion efficiency of 98.5% at output power = 1300 W and 98.3% at output power = 2 kW, when the inverter was operated at an input voltage of 400 VDC, output voltage of 220 VAC/60 Hz, and switching frequency of 20 kHz. The total harmonic distortion was < 0.66%, which demonstrates that the inverter is suitable for high-power dc-ac power conversion.
Highlights
The full-bridge inverter (FBI, Figure 1a) is widely used for dc-ac power conversion because of its simple structure and easy control [1]
IXFK80N60P3 inverter saved 8.62% of the circuit cost compared with the interleaved dual-buck inverter (IDBI), and 3.87% compared with FBI
This paper proposes an inverter that can achieve high power conversion efficiency ηe at high output power Po
Summary
The full-bridge inverter (FBI, Figure 1a) is widely used for dc-ac power conversion because of its simple structure and easy control [1]. The dual-buck inverters use freewheeling diodes to solve the shoot-through problem but have high output current ripple. The interleaved dual-buck inverter (IDBI) in [9], as shown, is basically a parallel connection of four buck converters. In this inverter, SU1 and SU2 operate to generate positive sinusoidal voltage, SD1 and SD2 operate to generate negative sinusoidal voltage, and the switching-phase differences between SU1 and SU2 and between SD1 and SD2 are set to 180◦. When IDBI uses typical sinusoidal pulse width control and operates at a low output power Po , IDBI has much higher total harmonic distortion (THD) of the output current than that of the FBI
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