Power switching and controlling circuit

Abstract

The invention provides a power switching and controlling circuit for controlling a power adapter or battery to supply power to a load. The circuit comprises a switching circuit and a controlling circuit, wherein the switching circuit comprises a first MOS (Metal Oxide Semiconductor) transistor, a second MOS transistor, and a third MOS transistor, and the source of the first MOS transistor is electrically connected with the positive electrode of the battery; the gate of the first MOS tube is electrically connected with the control circuit, and the drain of the first MOS transistor is electrically connected with the drain of the second MOS transistor; the gate of the second MOS transistor is electrically connected with the input terminal of the power adaptor, and the source of the second MOS transistor is electrically connected with a load and then is grounded; the source of the second MOS transistor is also electrically connected with the drain of the third MOS transistor, and the gate of the third MOS transistor is electrically connected with the control circuit; the source of the third MOS transistor is electrically connected with the input terminal of the power adaptor, and the control circuit controls the first MOS transistor and the third MOS transistor to be turned on or off. Compared with the traditional universal power switching and controlling circuit, the power switching and controlling circuit has the advantages of low power consumption, small amount of heat, and high standby efficiency.

Description

technical field [0001] The invention relates to the field of circuit control switching, in particular to a power switching control circuit. Background technique [0002] At present, many portable electronic products are powered by lithium batteries and charged by external power adapters, and can also be used while charging. The traditional lithium battery switching circuit generally uses the reverse characteristic of the diode to switch between the battery and the power adapter. However, due to the large power consumption of the diode itself, it is difficult to meet the needs of today's electronic products with low heat generation, low power consumption during work and standby. directional development needs. Contents of the invention [0003] Based on this, it is necessary to solve the problem that the traditional power switching control circuit is difficult to meet the needs of electronic products in the direction of low heat generation, low working and standby power con...

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to solve the problem that the traditional power switching control circuit is difficult to meet the needs of electronic products in the direction of low heat generation, low working and standby power consumption, and provide a power supply that reduces circuit heat generation and reduces working and standby power consumption. switch control circuit

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