Compact Design of Buck Based FPGA Topology for Battery Charging System

摘要

This paper describes compact design of buck based FPGA topology for battery charging system. It comprises different blocks like flyback converter, buck converter, FPGA, ADC. Flyback converter uses 230V as input and gives 36V at the output. Output of flyback converter used as input for LM2596 buck converter to produce 12V output for charging battery. Buck converter is triggered by pwm pulses supplied by cyclone IV EP4CE22F17C6 FPGA. FPGA enhances computation capability of digital controller. Current sensor measures battery charging current through one of the eight ADC channels. Battery operates in three modes such as trickle current, constant current and constant voltage with different protections like over voltage, under voltage, over current, short circuit protection and thermal protection. Simulated waveforms of buck converter and RTL schematic in FPGA for ADC and pwm are given.