A zero-power linear charging circuit

Abstract

The invention discloses a zero-power-consumption linear charging circuit, which relates to the technical field of battery charging circuits. The zero-power-consumption linear charging circuit of the present invention includes a voltage detection analog circuit, a bias current generation circuit, a level shift circuit, and an internal power source selection circuit. The circuit and linear charging module use a voltage detection analog circuit to detect whether the adapter is inserted. When the adapter is not inserted, the voltage detection analog circuit, level shift circuit and bias current generation circuit do not consume power. The scheme of detecting whether the adapter is inserted or not, this scheme does not need to detect whether the adapter is connected at all times, and the overall power consumption is low, thus solving the problem that when the charging adapter does not exist, it is necessary to always detect whether the adapter is inserted, resulting in high standby power consumption of the charging circuit .

Description

technical field [0001] The invention relates to the field of battery charging circuits, in particular to a zero-power consumption linear charging circuit. Background technique [0002] At present, with the rapid rise of smart wearables, the standby power consumption of the linear charging circuit is getting lower and lower when the charging adapter is not required. In order to reduce the standby power consumption when the charging adapter is not present, the common practice of the linear charging circuit is to detect the presence or absence of the charging adapter. When it is detected that the adapter does not exist, most of the power-consuming modules are disabled and enter a low-power mode. [0003] figure 1 It is a structural diagram of an existing low-power linear charging circuit. The low-power linear charging circuit includes: a charging adapter detection module, a voltage reference and a linear charging module. When the charging adapter does not exist, it is necessa...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to address the above technical problems and provide a zero-power linear charging circuit to solve the problem that when the charging adapter does not exist, it is necessary to detect whether the adapter is plugged in at all times, resulting in a large standby power consumption of the charging circuit.

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