JSSC 2020第8期Power Management0.35µm高压CMOS工艺Neural Network Accelerator

A Hybrid LED Driver With Improved Efﬁciency Yu a n G a o, Member , IEEE

提出一种高效混合LED驱动器，结合开关转换器和无电感驱动方案的优点，实现高功率因数和低闪烁。

95.1%功率效率，0.986功率因数，92%效率（低闪烁配置），15%闪烁

LED驱动器高效率混合拓扑功率因数低闪烁

▸结合开关转换器和无电感驱动方案的优点

▸自动在开关模式和线性模式之间切换

▸可配置为单级或两级解决方案以适应不同需求

Abstract

A high-efﬁcient hybrid light-emitting diode (LED) driver is introduced in this article. By combining the merits of conventional switching-converter-based and inductor-less driving solutions, the proposed topology fully utilizes the input power from the ac mains without causing considerable switching loss or excessive voltage stress. With the help of a small-size inductor and the hybrid scheme, the proposed driver automatically alternates between switching mode and linear mode as the rectiﬁed input voltage changes. In addition, the driver can be conﬁgured either in a single stage for a high power factor (PF) and high efﬁciency or in the second stage of a two-stage solution for alleviating harmful low-frequency ﬂicker. The proposed driver-integrated circuit is implemented in a 0.35- µm high-voltage CMOS process and tested under 110-V AC 60-Hz input. Measurement results show that, when operating in the high PF conﬁguration, the proposed driver achieves 95.1% power efﬁciency and 0.986 PF. For the low ﬂicker conﬁguration, it achieves 92% efﬁciency and 15% ﬂicker while maintaining a 0.918 PF.