High-Efficiency and Full Range ZVS Single-Stage Semi-DAB AC–DC Converter With Improved Modulation and Variable Frequency Control
- Resource Type
- Periodical
- Authors
- Ma, P.; Sha, D.; Zhang, D.
- Source
- IEEE Transactions on Power Electronics IEEE Trans. Power Electron. Power Electronics, IEEE Transactions on. 39(5):6003-6016 May, 2024
- Subject
- Power, Energy and Industry Applications
Aerospace
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
General Topics for Engineers
Nuclear Engineering
Signal Processing and Analysis
Transportation
Zero voltage switching
Inductors
Modulation
Frequency control
Voltage control
Switching frequency
Control systems
Full operating range zero-voltage-switching (ZVS)
improved variable switching frequency control
more accurate ZVS criteria
new modulations
single-stage ac–dc converter
- Language
- ISSN
- 0885-8993
1941-0107
In this article, an improved modulation and variable frequency control strategy for a single-stage high-frequency isolated semi-dual-active-bridge-based ac–dc converter is proposed, which can achieve full operating range (the entire ac line cycle and full-load range) zero-voltage switching (ZVS) and high efficiency. Compared with the basic variable frequency control, an improved variable frequency strategy can reduce the envelope of leakage inductor peak current and reduce the dependence and sensitivity to the load power. More accurate ZVS criteria in view of the magnetizing inductor L m are proposed. Seven operating modes are adopted and the transition among them is seamless. Three control variables are used in every mode. Wide voltage conversion gain and high-quality grid-side ac current can be obtained without mandatory current-tracking loops. In addition, detailed comparisons among different control strategies and different mode operating regions are analyzed. The design of the transformer and inductor is not affected at all despite the switching frequency varies. A 250-W experimental prototype was built to verify the effectiveness of the proposed improved variable frequency control strategy.