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简要分析了几种单级功率因数校正及变换的拓扑及其相应的控制策略，基本工作原理，并比较了它们的优缺点和不同的应用场合。
Several kinds of single-level power factor correction and transformation topologies and their corresponding control strategies and basic working principles are briefly analyzed. Their advantages and disadvantages and different applications are compared.