【摘要】 针对电解电容会导致LED驱动电源的使用寿命和可靠性降低等问题，提出一种集成反激式两开关无电解电容LED驱动电路拓扑，集成了反激变换器、Buck-Boost变换器以及Buck变换器，简化了电路结构，实现了高功率因数、输出电流的低频纹波抑制和恒流控制。利用Buck-Boost变换器将交流侧多余的能量转移至辅助电路的储能电容，利用Buck变换器补偿输出侧不足的能量，平衡输入交变功率与输出功率之间的差值，减小储能电容的容量，从而使电路可以使用小容量的薄膜电容替代电解电容，实现无电解电容化。详细分析所提电路拓扑的工作原理，并提出适用于拓扑的控制策略，给出电路主要参数的设计方法。最后，试制一台36 W的实验样机，验证所提电路拓扑及其控制策略的有效性。更多还原

【Abstract】 To address the issues of reduced lifespan and compromised reliability in LED driver power supplies caused by electrolytic capacitors, an integrated flyback two-switch electrolytic capacitor-less LED driver circuit topology was proposed, which integrates a flyback converter, a Buck-Boost converter and a Buck converter, simplifies the circuit structure, and achieves a high power factor, low frequency of the output current ripple suppression and constant current control. The Buck-Boost converter was used to transfer the excess energy from the AC side to the storage capacitor of the auxiliary circuit, and the Buck converter was used to compensate for the insufficient energy on the output side, which balances the difference between the input alternating power and the output power, and reduces the capacity of the storage capacitor, thus allowing the circuit to be electrolytic capacitor-less by using small-capacity film capacitors instead of electrolytic capacitors. The working principle of the proposed circuit topology was analysed in detail, the control strategy applicable to this topology was proposed, and the design method of the main parameters of the circuit was given. Finally, a 36 W experimental prototype was fabricated to verify effectiveness of the proposed circuit topology and its control strategy.更多还原