Control method, device and electronic equipment applied to battery charging circuit

Abstract

The embodiment of the invention provides a control method for a battery charging circuit, a device and an electronic device. In the embodiment of the invention, when the voltage of an adapter socket is more than a first preset voltage at a moment in a voltage boosting process of the adapter socket, the first preset voltage of the adapter socket is less than the stable voltage, a first switch tube is under switch-off state, and meanwhile, a second preset voltage is applied to an output end of the first switch tube; when the voltage of the adapter socket approaches to the stable voltage, namely, the first switch tube is connected, the voltage difference of the output end and input end of the first switch tube is the difference between the stable voltage and the second preset voltage; compared with the difference between the stable voltage and the voltage almost being 0 in the prior art, the voltage difference of the output end and input end of the first switch tube is greatly reduced, the power endured by the first switch tube is within the endurance capacity scope of the first switch tube, and the problem of damage to the first switch tube is avoided.

Description

technical field [0001] The present application relates to the technical field of communication, and more specifically relates to a control method, device and electronic equipment applied to a battery charging circuit. Background technique [0002] When the energy of the battery in the electronic device is low or exhausted, it needs to be connected to the power supply through the adapter, so as to achieve the purpose of charging the battery by the power supply. Back-to-back MOSFETs connect the adapter and battery. [0003] Such as figure 1 As shown, it is a schematic diagram of a battery charging circuit in the prior art, such as figure 1 The middle MOSFET 11 and the MOSFET 12 are back-to-back MOSFETs. The gate G1 of MOSFET 11 is connected to the gate G2 of MOSFET 12, the drain D1 of MOSFET 11 is connected to the socket ADIN_1 of the adapter, the source S1 of MOSFET 11 is connected to the source S2 of MOSFET 12, and the drain D2 of MOSFET 12 is connected to the battery co...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a control method, device and electronic equipment applied to a battery charging circuit, so as to overcome the problem of MOSFET 11 source S1 and drain D1 when MOSFET 11 and MOSFET 12 are simultaneously turned on in the prior art. The voltage difference between them is very large, and it is easy to exceed the withstand capacity of MOSFET 11, causing the problem of MOSFET 11 burning

Images