Design of integrated high-voltage power converters and their applications in solid-state LED lighting system

High-voltage (HV) power converters can be easily found in electronic vehicles, renewable energy systems, medical equipment, solid-state Light Emitting Diode (LED) lighting systems, etc. They can greatly reduce bill-of-material (BOM) size and cost while improving scalability and reliability without compromising performance.;It is necessary to maximize the power density and the power efficiency of the HV power converters. Two integrated low-power and high-speed gate drivers in HV power converters are presented in this dissertation. The first capacitively coupled level shifter (CCLS)-based gate driver supports complimentary-metal-oxide-semiconductor (CMOS) power train, and the second dynamically controlled level shifter (DCLS)-based gate driver enables dual-nMOS power train. Implemented in a 0.5-mum 120-V CMOS process, both proposed CCLS and DCLS have improve the figure of merit (FoM) by at least 10 times and 2.9 times compared with state-of-the-art level shifters. The buck converter with the CCLS-based gate driver achieves a maximum efficiency improvement of 11.5%.;HV power converters have also been used for high-brightness solid-state LED lighting applications. Previously-reported dimmable LED drivers from industry and literature are unable to simultaneously meet contradictory performance requirements on input range, power efficiency, settling time, and current accuracy. This dissertation presents a glitch-tolerant synchronous current control scheme and advanced HV current sensors to improve the performances of LED drivers. Implemented in a 50-V 0.35-mum CMOS process, experimental results show that the proposed LED driver supports a wide input range from 5 V to 45 V, operates up to 4 MHz. The proposed LED driver achieves a peak power efficiency of 97.2% and the current deviation <3.3% of the average LED current under different conditions.;Finally, a wide input range 5 - 115-V dimmable LED driver in 120-V 0.5-mum CMOS is presented. In this work, an auto-configurable switching scheme and adaptive resonant timing control are developed to enable soft-switching for improving the converter power efficiency under wide input range. Hence, a high peak power efficiency of 94.4% is achieved. Adaptive synchronous current control is also proposed to enhance the current accuracy of the LED driver to within 6.4% over wide ranges of input and output voltages.