Dual-Buck Full-Bridge Inverter With Hysteresis Current Control

• Published in: IEEE transactions on industrial electronics (1982) Vol. 56; no. 8; pp. 3153 - 3160
• Main Authors: Zhilei Yao, Zhilei Yao, Lan Xiao, Lan Xiao, Yangguang Yan, Yangguang Yan
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2009; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Buck converter; Current control; Devices; Diodes; Electric potential; full-bridge; Guidelines; half-bridge; Hysteresis; hysteresis current control; Inverters; Stability analysis; Stress; Stresses; Switches; Uninterruptible power supply; Uninterruptible power systems; Voltage
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2009.2022072

This paper presents a dual-buck full-bridge inverter (DBFBI) to solve the shoot-through problem in conventional bridge-type inverters and reduce the voltage stress of the power device in the dual-buck half-bridge inverter (DBHBI). Hysteresis current control is used in the DBFBI. All switches and diodes operate at each half line cycle, and the freewheeling current flows through the independent freewheeling diodes instead of the body diodes of the switches, so the efficiency can be increased potentially. As the shoot-through problem does not exist in the DBFBI, dead time between the switches need not be set. The input-voltage utilization rate of the DBFBI is twice that of the DBHBI under the same output-voltage condition, i.e., the voltage stress of the power device in DBFBI is half that in the DBHBI. The operating principle, stability and relative stability analyses, and design guidelines and example are provided. Experimental results of a 1-kVA DBFBI verify the theoretical analysis. The comparisons among other inverters and the DBFBI show that the proposed inverter is very promising in 220-240-V rms output-voltage and high-reliability applications, such as uninterruptible power supplies and grid-connected inverters.