| Autor: |
SUN Zhan, WANG Yijie |
| Jazyk: |
čínština |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
电力工程技术, Vol 41, Iss 1, Pp 70-76 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2096-3203 |
| DOI: |
10.12158/j.2096-3203.2022.01.010 |
| Popis: |
With the increasing energy required by data center, a soft switch power factor correction (PFC) circuit based on totem pole structure is designed to meet the urgent need of high performance index of converter. A soft-switching PFC circuit based on the totem pole structure that can achieve high efficiency and high power density is proposed. The bridgeless PFC topology is combined with the third-generation wide bandgap GaN device, and it is realized through a fully digital control method. The circuit is switched to work in two states of critical current and quasi-square wave to ensure that the converter has the power factor correction function and realizes zero voltage switch (ZVS). The basic circuit structure of the totem pole bridgeless PFC is first introduced. The conditions for realizing the soft switching characteristics are obtained through the analysis of the circuit transient process. Then the system power factor correction function is realized according to the all-digital double closed-loop control method, combined with mathematical simulation to analyze different states totem pole PFC output characteristics. Finally, an AC/DC converter with 220 V input and 48 V/400 W output is built. The results show that while the PFC function is implemented, it can maintain ZVS characteristics in the full input voltage range, verifying the feasibility of the circuit design and control strategy. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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