L4981在门机电源功率因数校正中的应用

针对普通开关电源功率因数较低和谐波较大的缺陷,以L4981功率因数校正芯片为核心,构建了双级式PFC电源的功率因数校正前级。在选取确定了主电路拓扑结构后,介绍了它的工作原理及主要外围器件参数的计算方法,最后给出了一则基于L4981的应用于300W AC/DC自动门电源上的功率因数校正模块的设计实例。测试结果表明,此方法可有效改善电源品质。

Application of L4981 in Active Power Factor Correction for Gate Driver

Aiming at the defects of normal switching power supplies, e.g. low active power factor and higher harmonics, by adopting L4981 power factor correction chip as the core element, a two-stage PFC pre-corrector is built. Having been selected the topological structure of the main circuit, the operational principle and the calc~ation method for parameters of major peripherals are introduced. The design of a sample application based on L4981, the correction module for 300 W AC/DC power supply of the automatic gate is given. The test result shows that the method is effective in improving the quality of the power supply.