Apparatus and method for regulating working frequency of step-down conversion circuit by detection current

Abstract

The invention provides a device and a method for regulating the working frequency of a voltage reduction switching circuit through current detection. The device comprises a current detection circuit, a variable module and a controller. The current detection circuit is used for judging the output load state of the voltage reduction switching circuit through the detection of the size of current flowing out from the voltage reduction switching circuit and outputting a control signal for regulating the working frequency of the voltage reduction switching circuit according to the load state. The variable module is coupled with the voltage reduction switching circuit and is used for providing an external resistor for the voltage reduction switching circuit. The controller is coupled to a current monitoring module and the variable module and is used for receiving the control signal and regulating the resistance value of the variable module according to the control signal so as to regulate the working frequency of the voltage reduction switching circuit. The device and the method can reduce loss of the voltage reduction switching circuit.

Description

technical field [0001] The present invention relates to a power supply technology, and in particular to a technology for reducing the loss of power supply equipment. Background technique [0002] With the development of electronic information technology, many circuits are required to convert the battery voltage into a power supply voltage, such as mobile phones, laptop computers and other battery-powered handheld devices, all need to convert the battery voltage into a power supply voltage. The VRD (voltage regulator down, step-down conversion circuit) module is used in a general power supply as a basic voltage regulation circuit, so more and more VRD modules are used in various electronic products. [0003] Most of the current computers use VRD as a power supply device for the CPU (Central Processing Unit). However, since the current VRD modules all adopt a fixed switching frequency, when it is applied to a computer, the frequency of the VRD module remains unchanged regardl...

AI Technical Summary

Problems solved by technology

[0007] One of the purposes of the present invention is to provide a device for adjusting the operating frequency of the step-down conversion circuit by detecting the current, so as to solve the problems of high cost and complicated detection process in the prior art

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