應用於燃料電池混合動力供電系統疊接型直流-直流轉換器之數位控制晶片實作

Abstract

This work presents the architecture and design of a three-phase digital pulse width modulation (PWM) controller chip for 400-W cascoded dc-dc converter operating at continuous conduction mode in hybrid fuel cell system. A scheme for sensing three-output voltage and two-output current with an external 8-bit resolution analog-to-digital converter (ADC) is designed. To achieve the sensed values precisely, the data conversion to actual voltage and current from output of ADC is implemented which exploit the 20-bit fixed-point notation method. In addition, the suitable control strategy of modulation method is proposed with a single-input fuzzy logic controller (SIFLC) based on sliding surface method. The implementation techniques of digital controller are integrated on an application-specified integrated circuit (ASIC) in a complementary metal oxide silcon (CMOS) 0.18-m process on a 1.06-mm2 silcon area with power consumption of 4.340 mW and operated at the switching frequency of 16 kHz, which is comparable to state-of-the-art digital solutions. The overall implementation requires only 4892 logic elements which is fewer than 604 logic elements compared to conventional FLC owing to the simplicity of the SIFLC algorithm. For the exprimental system, two open-loop measurements were verified successfully for cascaded dc-dc converters in hybrid fuel cell system to achieve a steady-state output.

Date of Award	2023
Original language	Chinese (Traditional)
Supervisor	Chih-Lung Lin (Supervisor)