New high-efficiency multifunctional buck/boost/buckboost PFC converter
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ORIGINAL ARTICLE
New high‑efficiency multifunctional buck/boost/buckboost PFC converter Lunquan Li1,3 · Chang Ye2 · Qianhong Chen1 · Jun Li2 · Bin Liu2 Received: 9 March 2020 / Revised: 16 September 2020 / Accepted: 17 September 2020 © The Korean Institute of Power Electronics 2020
Abstract A new three-phase buck/boost/buckboost power factor correction rectifier is presented in this paper. For the converter, only two high-frequency switching actions exist in each sample period, and only one inductor is used. As a result, system efficiency can be improved. The commutation procedures are analyzed for the three modes, the controller design of the rectifier is discussed, and the output duty is assigned between switches according to different intervals of input voltage. Experiments are conducted to verify the effectiveness of the proposed rectifier. Keywords Buck PFC · Boost PFC · Buckboost PFC · Conduction state · Controller
1 Introduction Charging technology, which is converting alternative grid energy into DC batteries, is attracting more interest with the development of electric vehicles. PFC converters are adopted as the first stage of the chargers, and a DC/DC converter is often used for the second stage. For a system with a large capacity, a three-phase PFC is commonly used because the maximum power of single ones is limited [1, 2]. Chargers are built in vehicles or charging stalls. There are two kinds of PFC rectifiers: boost type and buck type. The former [3] is simple and adopted widely but requires the output voltage to be higher than the input peak line voltage. In several cases requiring a low DC output voltage, such as the charger for electric vehicles, a bucktype DC/DC converter should be connected serially to the boost-type PFC. This kind of system design is very simple and direct, and has become sophisticated. Many academic or engineering achievements exist for this type of converter,
* Qianhong Chen [email protected] 1
College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2
Institute of Information Engineering, Nanchang Hangkong University, Nanchang, China
3
Gaoyi Zhineng Electric Ltd., Shenzhen, China
which include the control of output voltage, input current, SVM modulation, or system efficiency improvement [4–7]. The buck-type PFC has become an engaging research focus in recent years because it can greatly improve conversion efficiency, while the controller has become more complicated to update converter topology and improve system efficiency or power density. In [8], three single-phase PFC converters are combined to form a three-phase buck-type rectifier. The system inductor current can be properly distributed to the three phases by proper modulation such that the system drains the three-phase sinusoidal mains currents through a low-pass filter. In [9], a novel buck-type PFC rectifier is proposed, where the conduction states, controller design, and modulation strategy are discussed in detail. The key of the topology is the contro
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