Design of load balancing of polymer lithium -ion battery charging system.best solar generator for home

　　The traditional method of designing polymer lithium -ion battery power supply system is to directly connect the system load with the battery. The system load will keep the lithium ion battery discharge and consume the life cycle of the battery. In order to maximize the life cycle of the lithium -ion battery, it is recommended to stop charging appropriately when the input power supply is available, and supply the system by the input power supply. In order to prevent overcharges from lithium ion batteries, a duration timer is usually used as auxiliary method to turn off the battery charging activity before meeting the appropriate termination conditions. The minimum current detection in the constant voltage phase is a typical termination method for lithium ion batteries. If the system consumes current from lithium -ion battery continuously, the minimum current cannot be used to terminate the charging management system normally. It will open and close regularly, or cause errors due to timer failure conditions.

　　MCP73871 of polymer lithium -ion batteries aims to overcome these design challenges of lithium -ion battery power supply application. MCP73871 is a compact and functional single -chip solution. This device is very suitable for designing small systems, and it can also extend the operation time and battery life of the system. The MCP73871 device is a complete linear solution for system load balancing and lithium polymer battery charging management. You can choose AC/DC wall adapter or USB port power. In addition, it can choose independent power supply between the input power and the battery. This device is not only small in physical volume and fewer external components, so it is very suitable for portable applications. The MCP73871 device can automatically obtain the power supply of the system load from a single -section ion battery or input power supply (AC/DC wall adapter or USB port). The MCP73871 device fully follows the current consumption limit specified in the USB specification. When using the AC/DC wall adapter to the system, the external resistance will set up a charging current with a maximum value of 1A. At the same time, it will support the total current of the system load and battery charging current with a maximum of 1.8A. The MCP73871 device uses a constant current/constant voltage (CC/CV) charging algorithm, which has optional charging termination points. Provide 4 fixed constant voltage voltage voltage voltage options: 4.10V, 4.20V, 4.35V or 440V to meet the emerging battery charging needs. Under high power consumption or high -ambient temperature conditions, the MCP73871 device can also limit the charging current based on the temperature limit of the nude. This heat -tone function can optimize the charging cycle time, while maintaining the reliability of the device. The MCP73871 device contains a battery low -power indicator, a normal power indicator, and two charging status indicator. You can use LED to display or communicate with the main control single -chip microcomputer. The MCP73871 device supports the ambient temperature range from -40 ° C to+85 ° C.

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