A new type of high power LED drivers is proposed by adopting an improved two-stages non-isolated configuration. In order to improve power factor and achieve accurate average current control under universal input volta...A new type of high power LED drivers is proposed by adopting an improved two-stages non-isolated configuration. In order to improve power factor and achieve accurate average current control under universal input voltages ranging from 100 Vrms to 240 Vrms, the power factor correction and average current mode control methods operating in continuous current conduction mode are designed and implemented. With the LUMILEDS emitter type LEDs, a laboratory prototype is built and measured. And from the measured results, it could be concluded that the proposed driver has many better performances such as high power factor, low current harmonic, accurate average current control and switch protection.展开更多
An integrated single-inductor dual-output （SIDO） switching DC-DC converter is presented. The outputs are specified with 1.2 V/400 mA and 1.8 V/200 mA. A decoupling small signal model is proposed to analyze the multi...An integrated single-inductor dual-output （SIDO） switching DC-DC converter is presented. The outputs are specified with 1.2 V/400 mA and 1.8 V/200 mA. A decoupling small signal model is proposed to analyze the multi-loop system and to design the on-chip compensators. An average current control mode is introduced with lossless, continuous current detection. The converter has been fabricated in a 0.25μm 2P4M CMOS process. The power efficiency is 86% at a total output power of 840 mW while the output ripples are about 40 mV at an oscillator frequency of 600 kHz.展开更多
为解决应用于LCL型并网逆变器的传统反步控制策略所存在的计算量大、测量噪声被成倍放大的问题,提出一种基于加权平均电流控制WACC(weighted average current control )的改进反步控制策略。首先,利用WACC策略将LCL三阶滤波系统降阶为一...为解决应用于LCL型并网逆变器的传统反步控制策略所存在的计算量大、测量噪声被成倍放大的问题,提出一种基于加权平均电流控制WACC(weighted average current control )的改进反步控制策略。首先,利用WACC策略将LCL三阶滤波系统降阶为一阶,在有效减少整体计算量的同时,降低对虚拟控制量的求导次数;然后,利用滑模观测器对加权平均电流进行观测,以减小LCL滤波器参数摄动对加权平均电流精度的影响;最后,依据所建立的等效系统模型设计反步控制器,控制并网电流。仿真与实验结果表明,所提控制策略具有良好的稳态性能和较高的鲁棒性。展开更多
文摘A new type of high power LED drivers is proposed by adopting an improved two-stages non-isolated configuration. In order to improve power factor and achieve accurate average current control under universal input voltages ranging from 100 Vrms to 240 Vrms, the power factor correction and average current mode control methods operating in continuous current conduction mode are designed and implemented. With the LUMILEDS emitter type LEDs, a laboratory prototype is built and measured. And from the measured results, it could be concluded that the proposed driver has many better performances such as high power factor, low current harmonic, accurate average current control and switch protection.
文摘An integrated single-inductor dual-output （SIDO） switching DC-DC converter is presented. The outputs are specified with 1.2 V/400 mA and 1.8 V/200 mA. A decoupling small signal model is proposed to analyze the multi-loop system and to design the on-chip compensators. An average current control mode is introduced with lossless, continuous current detection. The converter has been fabricated in a 0.25μm 2P4M CMOS process. The power efficiency is 86% at a total output power of 840 mW while the output ripples are about 40 mV at an oscillator frequency of 600 kHz.
文摘为解决应用于LCL型并网逆变器的传统反步控制策略所存在的计算量大、测量噪声被成倍放大的问题,提出一种基于加权平均电流控制WACC(weighted average current control )的改进反步控制策略。首先,利用WACC策略将LCL三阶滤波系统降阶为一阶,在有效减少整体计算量的同时,降低对虚拟控制量的求导次数;然后,利用滑模观测器对加权平均电流进行观测,以减小LCL滤波器参数摄动对加权平均电流精度的影响;最后,依据所建立的等效系统模型设计反步控制器,控制并网电流。仿真与实验结果表明,所提控制策略具有良好的稳态性能和较高的鲁棒性。
