Drive circuit, electronic device, and method for controlling charging

Abstract

The present application provides a driving circuit, an electronic device and a charging control method, including: a first interface connected to an external power supply device for receiving a DC signal input by the external power supply device; a second interface connected to the MCU connection, for receiving at least two pulse width modulation PWM signals input by the MCU; processing circuit, respectively connected with the first interface and the second interface, for connecting the direct current signal and the at least two channels The PWM signal is superimposed and rectified to obtain a first direct current signal, and the first direct current signal is output to the gate of the MOS transistor, so that the voltage of the gate of the MOS transistor is greater than the first threshold. Since the MCU inputs at least two PWM signals to the driving circuit through the second interface, it can avoid the reduction of the charging efficiency, the reduction of the fast charging current or the exit of the fast charging mode due to the low voltage of the MOS transistor VGS.

Description

technical field [0001] The embodiments of the present application relate to the technical field of charging, and in particular, to a driving circuit, an electronic device, and a method for controlling charging. Background technique [0002] With the popularization of electronic devices (such as mobile phones, pads, wristbands, etc.), the functions of electronic devices are constantly enriched. Some manufacturers have launched electronic devices that support fast charging mode. Fast charging technology has greatly shortened the charging time of electronic devices. widely favored. [0003] When fast charging electronic equipment, the gate voltage of the field effect (Metal Oxide Semiconductor, MOS) tube on the fast charging circuit is currently controlled by the driving voltage output by the driving circuit. However, the driving voltage output by the driving circuit currently used is relatively Small, so that the impedance between the drain and source of the MOS tube when it ...

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Problems solved by technology

[0003] When fast charging electronic equipment, the gate voltage of the field effect (Metal Oxide Semiconductor, MOS) tube on the fast charging circuit is controlled by the driving voltage output by the driving circuit at present, but the driving voltage output by the driving circuit currently used is relatively low. Small, so that the impedance between the drain and the source of the MOS tube is large when it is turned on. On the one hand, it causes serious heating of the MOS tube and reduces the charging efficiency; The impedance of the charging circuit is too large, which reduces the fast charging current or exits the fast charging mode

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