Research on LED flyback switching power supply based on trapezoidal integration PI control

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.