Charging circuit

Abstract

An embodiment of the present invention relates to the technical field of electronics and discloses a charging circuit. The charging circuit comprises a baseband management chip, a charging control circuit, a microcontroller, a rechargeable battery, an external power supply and a printer. A voltage input end of the baseband management chip is electrically connected to the external power supply, a power supply input end of the baseband management chip is electrically connected to a power supply output end of the charging control circuit, a charging output end of the baseband management chip is electrically connected to a detecting end of the charging control circuit, a control end of the baseband management chip is electrically connected to a first control input end of the microcontroller, apower supply input end of the charging control circuit is electrically connected to the rechargeable battery, a voltage output end of the charging control circuit is electrically connected to a voltage input end of the printer, a control end of the charging control circuit is electrically connected to the control output end of the microcontroller, and a second control input end of the microcontroller is electrically connected to a control end of the printer. The charging circuit is used for ensuring that the printer and the baseband management chip work normally at the same time and a POS machine is not automatically shut down.

Description

technical field [0001] The embodiments of the present invention relate to the field of electronic technology, and in particular to a charging circuit. Background technique [0002] Point of sales information management system (Point of sales, POS), referred to as POS machine, is a multifunctional terminal reader equipped with barcode technology. Realize the automatic transfer of electronic funds, with functions such as supporting consumption, pre-authorization, balance inquiry, transfer and printing receipts. At present, the traditional POS machine is developed based on the 2G mobile phone platform. There are three existing implementation methods of the charging system: external charging power supply; adding an additional charging management chip; directly using the original baseband management chip in the 2G mobile phone platform. charging unit. [0003] The inventors have found that there are at least the following problems in the prior art: whether an external charging ...

AI Technical Summary

Problems solved by technology

[0003] The inventor found that there are at least the following problems in the prior art: no matter using an external charging power source or adding an additional charging management chip, it will increase the cost and cause unnecessary waste

However, the POS machine developed based on the 2G mobile phone platform also includes a printing circuit, which will consume a large amount of power of the power supply battery of the POS machine when it is working.

Therefore, when the battery power is slightly low, the POS machine will automatically shut down and cannot be used normally.

For example, when the power supply battery still has 80% power, its output voltage will drop rapidly. At this time, the voltage of the power supply pin of the baseband management chip is lower than the threshold value of the hardware shutdown voltage, thus causing the main control unit of the POS machine to automatically closed, so that the POS machine cannot be used normally

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