Lithium-ion batteries because of their high specific energy, the advantages of small self-discharge, become an ideal electronic devices power. In recent years, as portable electronic products such as MP3, mobile phones and smart micro-universal instrumentation products, lithium-ion battery power system for the increasing demands. So, the design of stable, safe, reliable, high-performance lithium battery charger is particularly important.
In this paper, taking into account the cost of charging the battery safety, efficiency and the importance of design, based on the MSP430 microcontroller using Li-Ion battery charger to achieve the principles and methods. MSP430 family of single chip because of its ultra-low power consumption, powerful performance, the advantages of good stability and so become the first choice for the design of the chip. The design of the switch hardware circuits, voltage and current sampling circuit, display circuit, and draw schematic and PCB circuit diagram, bring out a software program programming charger.PWM-controlled single-chip switching power supply lithium-ion battery chargers, effectively overcome the general charge, under-charging, low efficiency of the shortcomings, the charger for charging the overall management process, To be completed by pre-charge, fast charge and trickle charge function of the basic charge and battery safety monitoring functions and display functions, the realization of the intelligent charging, and to ensure that the charging effect .The program designed with the flexibility to meet a variety of models of the demand for rechargeable lithium batteries, and integrated single-chip MSP430 flash memory make it easy to debug and upgrade software.
Keywords: lithium battery; charger; MSP430 single chip; switching power supply.