LED照明具有节能、安全、环保的特性，作为一个新兴的技术领域，在最近几年得到很大发展。LED是典型的电流驱动器件，精确控制驱动电流，可决定光效、电源效率、散热等许多参数。为了降低电流纹波系数，在高频反激式开关电源中，采用梯形积分PI控制方法。通过搭建基于MATLAB／Simulink的反激式开关电源模型，对梯形积分PI控制方法进行了仿真。仿真结果表明，梯形积分PI控制方法能有效的减小电源的纹波电流，电流纹波系数降低到1．5％，达到了控制目的。%LED illumination has characteristics of energy conservation, safety, environment protection. As a new technical field, it has made great progress. LED is a typical current driving device. Precise current controlling can determine many parameters such as luminous efficacy, power supply efficiency, heat dissipation and so on. To reduce current ripple coefficient, trapezoidal integration PI control is introduced into high-frequency switching power supply. It built the model of fly-back switching power supply based on MATLAB/Simulink to simulate trapezoidal integration PI control method. Simulation results show that trapezoidal integration PI control method can decrease the ripple current effectively. Ripple coefficient of current reduce to one point five percent, and achieve the control purpose.
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