CAJ | 학술논문

针对目前市场上LED照明驱动电源功率因数低、电流谐波大的问题，介绍了一种改进的两级式高功率因数LED照明驱动电源拓扑。该电源的前级采用Boost拓扑构成功率因数校正级，后级采用准谐振反激式拓扑构成DC/DC功率变换级，两级电路共用一个控制电路，简化了电路结构。分析了实现功率因数校正的控制原理，给出了主要的设计参数。制作一个额定功率为12 W的实验样机，进行功率因数校正、恒流稳压输出等实验，实验结果证明了该设计方案及控制方法的可行性与有效性。
침대목전시장상LED조명구동전원공솔인수저、전류해파대적문제，개소료일충개진적량급식고공솔인수LED조명구동전원탁복。해전원적전급채용Boost탁복구성공솔인수교정급，후급채용준해진반격식탁복구성DC/DC공솔변환급，량급전로공용일개공제전로，간화료전로결구。분석료실현공솔인수교정적공제원리，급출료주요적설계삼수。제작일개액정공솔위12 W적실험양궤，진행공솔인수교정、항류은압수출등실험，실험결과증명료해설계방안급공제방법적가행성여유효성。
In order to solve the disadvantages of the present LED power supply, such as low power factor and large harmonic current, a novel LED power supply with two-stage power factor correction was introduced in this paper. The first PFC stage of the introduced power supply adopts boost topology to improve the power factor, while the sec-ond DC/DC stage adopts quasi-resonant flyback topology to provide constant-current control regulation of the out-put. The PFC stage and the DC/DC stage are controlled by the same controller, which simplifies the circuit struc-ture, and achieves power-factor-correction and constant-curent driving concurrently. The operating principle of power factor correction was analysed in detail, meanwhile, the main design parameters were provided. A prototype of a 12W LED power supply was implemented and tested. The experiment results show that the power factor of the power supply is higher than 0?96, and the circuit design and control method are verified to be correct and effective.