a charging circuit

Abstract

The embodiment of the invention relates to the field of electronic technology, and discloses a charging circuit. The charging circuit includes a baseband management chip, a charging control circuit, a microcontroller, a rechargeable battery, an external power supply and a printer; the voltage input terminal of the baseband management chip is electrically connected to the external power supply, and the power supply input terminal of the baseband management chip is connected to the power supply output of the charging control circuit Terminals are electrically connected, the charging output terminal of the baseband management chip is electrically connected to the detection terminal of the charging control circuit, the control terminal of the baseband management chip is electrically connected to the first control input terminal of the microcontroller; the power supply input terminal of the charging control circuit is connected to the rechargeable battery Electrically connected, the voltage output terminal of the charging control circuit is electrically connected to the voltage input terminal of the printer, the control terminal of the charging control circuit is electrically connected to the control output terminal of the microcontroller, and the second control input terminal of the microcontroller is connected to the control terminal of the printer. electrical connection. It is used to ensure that the printer and the baseband management chip work normally at the same time, and prevent the POS machine from automatically shutting 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 (POS, POS) for short, is a multi-function terminal reader equipped with bar code technology. Realize automatic transfer of electronic funds, with functions such as support for consumption, pre-authorization, balance inquiry, transfer and printing receipts. At present, the traditional POS machine is developed based on the 2G mobile phone platform, and the existing implementation methods of its charging system are as follows: 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 inventor found that there are at least the following problems in the prior art: whether an external charging power source is used or an add...

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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