基于电流型控制的LED恒流源分析与设计

设计了一种输出功率约50W的LED恒流源驱动模块, 其负载为由多只LED管(每只功率为1W)采用混联方式组成的LED阵列。通过对其电流型反激式变换及恒流控制电路的设计与试制, 并在不同输入电压下, 改变负载测试, 可看出其电流变化规律基本相似。随着负载变小, 输出电压升高, 输出电流逐渐减小, 输出电流稳定度达4.6%。在一定负载时, 输出电压值保持在47.2V左右, 电压纹波峰-峰值约为400mV。电流波动约0.05A, 输出电流稳定可靠, 可用于对多只串并混联的LED阵列驱动供电。

Analysis and Design of LED Constant Current Source Based on Current Mode Control

A drive module of LED constant current source with the output power of about 50W was designed, and the load is a LED array consisting of multiple hybrid LED tubes, and the power of each LED is 1W. By designing and manufacturing of the current-mode flyback converter and constant current control circuit, tests with different loads under different input voltages indicate that the current change laws are similar for each condition. As the load decreases, the output voltage increases but the output current decreases, the output current stability will be up to 4.6%. Under a certain load and the output voltage maintaining at around 47.2V, the voltage ripple peak-peak value will be approximately 400mV. The current fluctuation is about 0.05A, and the output current is stable and reliable, which can be used for power supply of multiple hybrid LED array.