Step-down DC converter circuit structure

Abstract

The present invention provides a step-down DC conversion circuit structure, including a BUCK circuit structure, and the BUCK circuit structure includes a first voltage stabilizing capacitor, a second voltage stabilizing capacitor, a first voltage dividing resistor and a first voltage stabilizing capacitor. Two voltage-dividing resistors, wherein the first voltage-stabilizing capacitor and the second voltage-stabilizing capacitor are arranged in parallel to form an accommodating channel, and the first voltage-dividing resistor and the second voltage-dividing resistor are arranged on the The accommodating channel between the first voltage stabilizing capacitor and the second voltage stabilizing capacitor prevents the operator's fingers from touching the first voltage dividing resistor and the second voltage dividing resistor.

Description

technical field [0001] The invention relates to the field of wireless device communication, and further relates to a step-down DC conversion circuit structure with a protective structure and capable of stabilizing output current. Background technique [0002] With the development of electronic technology and the widespread use of consumer electronics equipment, the research and application of high-efficiency DC power conversion (DC-DC) has become an increasingly important direction. With its excellent characteristics, the DC-DC circuit has become the main application object in most consumer electronic devices, replacing the linear power conversion circuit. [0003] The DC-DC circuit is divided into two types of voltage mode and current mode control. The basic principle is that the output of the error amplifier is compared with the triangle wave to generate a PWM signal, and then the PWM signal drives the power tube to achieve conversion. Usually, the buck circuit in the DC-...

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Problems solved by technology

This phenomenon is indeed easy to occur in actual use, and it is difficult to track, and this damage is invisible and difficult to trace

[0007] At the same time, due to the existence of the 0 ohm resistor R100, it was originally used for the convenience of testing the current, but in fact 0 ohm is not a complete 0 ohm resistor, often with 0.01 ohm or even 0.05 ohm resistance inside, in a certain In some applications where the current is relatively large and the voltage fluctuation has a relatively large impact on the signal, the 0 ohm resistor R100 will have a practical impact

For example, when the current is 1A, there will be a maximum voltage fluctuation of 0.05V. This voltage fluctuation seems small, but it will cause changes in signal performance indicators in many power supply scenarios.

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