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Abstract
Electronic technology's fast development causes that various electronic products
towards portable type and the small lightweight direction. It also causes the more
electrification products to use power supply system which is based on battery. At present,
a lot of used batteries contain the nickel cadmium, the nickel hydrogen, the lead
accumulator and the lithium battery. Their respective characteristics have decided that
they will coexist in a long time development. Due to different types of batteries charge
characteristic differently. In general, to different type, even different voltage, capacity
rank battery use different battery chargers, but it leads some inconveniences in the actual
use.
The control core of the design is the single chip STC12C5A60S2 . The system is
composed of a power supply circuit, BUCK circuit, display circuit, output control
voltage / current detection circuit, output constant current circuit, over temperature /
overvoltage protection circuit. The basic function of achieving the battery charging, LED
indicator, liquid crystal display, protection mechanism and exception handling charger is
realized. In this paper, the charging parameter characteristics of lithium ion battery 、
charging principle and charging method is not only described in detail but also putting
forward the design idea and system structure of the charging module. The circuit
provides safe and fast charging function, which can be widely used in indoor and outdoor
lithium ion batteries, such as mobile phone, digital products and so on.
Keywords: Lithium-ion battery; STC12C5A60S2; the charging parameter
characteristics of lithium ion battery; charging rinciple and charging
method