Channel Switch Impedance Adjustable Power Circuit and Electronic Device

Abstract

The invention provides a power supply circuit with an adjustable channel switch impedance and electronic equipment. The power supply circuit comprises N main channel MOS tubes, a control module, an execution module and a detection module. The execution module comprises a first MOS tube; the detection module comprises a detection resistor and a second MOS transistor; a gate-source voltage of a mainchannel MOS transistor and the gate-source voltage of the first MOS transistor are configured to be consistent, and a source-drain voltage of the main channel MOS transistor and the source-drain voltage of the second MOS transistor are consistent; the control module is connected with a detection resistor and is used for detecting voltage drop information at two ends of the detection resistor; thevoltage drop information can represent a current of a load; and the current between a source and a drain of the first MOS transistor is adjusted according to the voltage drop information so as to adjust the source-drain voltage of the first MOS transistor so that the gate-source voltage of the main channel MOS transistor is correspondingly changed, and the impedance formed by the N main channel MOS transistors is adjusted accordingly.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a power supply circuit and electronic equipment with adjustable channel switch impedance. Background technique [0002] In the power circuit of electronic equipment, the adjustment of the main current channel can be realized by controlling the on-off control of the switching device in the main current channel. The power supply circuit can be applied to the power output side or the power input side of the electronic equipment. [0003] In the existing related technology, the current-sensing resistor and the MOS transistor used to control the on-off of the main current channel can be connected in series in the main current channel, and then the current of the main current channel can be determined based on the voltage of the current-sensing resistor. However, considering This solution will increase the heat loss of the main current channel. When the current is small, it is difficult to ac...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a power supply circuit and electronic equipment with adjustable channel switch impedance to solve the problems of heat loss, single control means, and difficulty in meeting various circuit requirements

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