Current Expansion Fast Charging Circuit for Handheld Electronic Devices

Abstract

A current expansion fast charging circuit for a handheld electronic device, including a charging management module integrated in the main chip of the handheld electronic device or built separately, and a rechargeable battery, especially, it also includes a basic charging current sampling resistor, an expansion The current charging current sampling resistor and the comparison expansion module; when the charging management module charges the rechargeable battery, the comparison expansion module outputs the expanded current from the expansion output port according to the voltage difference between the two comparison input ports. The current expansion fast charging circuit of the present invention has a simple structure and occupies less space on the printed circuit board. The actual charging current of the rechargeable battery is greatly increased in proportion by two sampling resistors and the comparison current expansion module, which improves the charging speed and meets the requirements for large capacity. The charging requirements of the rechargeable battery; at the same time, the charging management module can maintain the three-stage charging of the small current pre-charging stage, the constant current charging stage, and the constant voltage charging stage for the rechargeable battery, which is conducive to maintaining the life of the rechargeable battery.

Description

technical field [0001] The invention relates to a charging device for a rechargeable battery, in particular to a current expansion charging circuit suitable for a charging management module of a handheld electronic device. Background technique [0002] With the rapid development of multimedia technology, Bluetooth technology, wireless network technology, etc., a variety of handheld electronic devices have appeared on the market, including Internet radio, Bluetooth hands-free devices, portable media players, mobile communication terminals, global positioning system GPS, handheld Instruments and PDAs. Generally, the handheld electronic devices have a built-in rechargeable battery as a power source; in order to cooperate with the reasonable charging of the battery, the handheld electronic device is also equipped with a charging management module separately or integrated in the main chip. In order to meet the requirements of miniaturization and portability, the space provided b...

AI Technical Summary

Problems solved by technology

[0005] 1. Use a dedicated charging management module, resulting in waste of resources; at the same time, the main chip of the handheld electronic device cannot monitor the charging state through the charging management module;

[0006] 2. Configuring a dedicated charging management chip and adding a current expansion circuit increases the cost of the handheld electronic device; and configuring a complicated current expansion circuit increases the space occupied by the printed circuit board, which is not in line with the development of miniaturized and portable handheld electronic devices Moreover, these added dedicated charging management chips and current expansion circuits need manual debugging, which increases production costs; and the charging current is not programmable, and it is not possible to implement small current pre-charging, constant-current charging, and constant-voltage charging stages for rechargeable batteries. Three-stage charging, affecting the life of the rechargeable battery

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