一种能量分配与能量回馈型的单级式无电解电容LED驱动器

A Single Stage Electrolytic-capacitor-less LED Driver Based on Energy Channeling Method and Energy Feedback Method

为了消除电解电容对发光二极管(light emitting diode,LED)驱动器使用寿命的影响,减少LED驱动器中功率半导体的使用数量及能量多次处理的比例。文中提出一款能量分配与能量回馈的单级LED驱动器。该驱动器通过添加一个非常简单的纹波消除电电路,输出一个交流的纹波消除电压以抵消总电压纹波。当输出的纹波消除电压为正电压时,LED驱动器工作在能量分配模式,实现能量的单级传递。当纹波消除电压为负时,LED驱动器工作于能量回馈模态并向输入侧回馈小于4%的输出功率。该LED驱动器同时兼具了低能量传递比例、低功率半导体器件使用数量的优点,使得其效率非常接近单级LED驱动器。最后,搭建一台35W(100V,0.35A)的样机验证方案的可行性。

To eliminate the impact on the life time of light emitting diode(LED)drivers due to electrolytic capacitors and reduce power processing,this paper presented a single-stage LED driver with energy channeling and feedback method.The proposed LED driver could output an AC ripple cancellation voltage by the simple ripple cancellation circuit to offset the PFC stage circuit output voltage ripple.When the cancellation voltage was positive,the LED driver worked in energy channeling mode and realized the single-stage energy conversion.When the cancellation voltage was negative,the LED driver worked in the energy feedback mode and feeds back less than 4%of the output power to the input side.The LED driver had the characteristics of low energy transfer ratio and low power semiconductor devices,its efficiency was very close to that of single-stage LED driver.Finally,a35 W(100 V/0.35 A)prototype was built to verify the feasibility of the scheme.