Li-Ion Multi-Bay Battery Charger Reference Design
Created: Sep 03, 2014
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Li-ion battery is a type of rechargeable battery, which excites lithium ions positive electrode to the negative electrode during charge and opposite when discharging. Lithium ion batteries are the most common batteries used for electronic gadgets.
The MCP1630 Li-Ion multi-bay battery charger is a complete, stand-alone, constant-current, constant-voltage battery charger for single-cell Li-Ion battery packs. Different battery chemistries (i.e. three NiMH or NiCd batteries connected in series) can be charged with minor modifications to the firmware. This board utilizes Microchip's MCP1630 (High-speed PWM MSOP8), MCP6292 (Dual Op Amp MSOP8) and PIC18F2410 (Flash MCU SOIC28). The input voltage range for the MCP1630 Li-Ion Multi-Bay Battery Charger is 10V to 28V. The output is capable of charging at a fast-charge rate of 2A constant current. An input terminal block is provided to apply an input voltage to the charger and as a convenient means to daisy-chain boards together. Output headers are also provided as a means to connect the external battery packs or simulated battery loads.
The circuit is intended for use in pseudo-smart battery charger applications in conjunction with battery packs containing Microchip's PS700 Battery Monitor. Standard battery packs can be utilized as well. It provides preconditioning, cell temperature monitoring and battery pack fault monitoring. Each charger bay provides status and fault indications. It automatically detects the insertion or removal of a battery pack.