Charging indicating circuit and mobile terminal

Abstract

The invention discloses a charging indicating circuit and a mobile terminal. The charging indicating circuit comprises a battery, at least one LED, a processor, and a control circuit, wherein both the processor and the battery are connected to the at least one LED. The control circuit comprises a first switching element and a second switching element; a first terminal of the first switching element is connected to the at least one LED; the connection point of a control terminal of the first switching element and a first terminal of the second switching element is connected to an input terminal of a power supply; a control terminal of the second switching element is connected to the processor; and the first switching element together with a second terminal of the second switching element are grounded. By the above means, when the voltage of the battery is extremely low, the voltage at the input terminal of the power supply controls the LED to indicate a charging state.

Description

technical field [0001] The invention relates to the field of mobile terminals, in particular to a charging indication circuit and a mobile terminal. Background technique [0002] Today's mobile terminals usually use a direct charging method when they are out of power, such as mobile phones, tablets or other wearable devices. These mobile terminals have LED indicators, which generally display red when charging, and display green after charging. [0003] These LED indicators are all controlled by the baseband processor, but the baseband processor generally does not work because the battery voltage is too low. Protect 2.3V. At this time, charge the low-voltage battery. Since the processor cannot work (lower than 3.3V), the LED indicator will not display normally. You must wait until the battery voltage reaches the 3.3V processor operating voltage before you can turn on the charging indicator normally. This waiting time depends on the capacity of the battery and the charging c...

AI Technical Summary

Problems solved by technology

This waiting time depends on the capacity of the battery and the charging current. It usually takes several minutes to ten minutes. When the charger is plugged in, the LED light and LCD of the mobile phone will not display, which will give users the illusion that the battery is faulty or other reasons. Poor user experience

[0004] Mid-to-high-end mobile phones on the market use switch charging chips. Since the chip has its own power path management, it can solve such problems, but such chips are expensive and increase the cost.

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