Design method based on board-level power-supply current feedback circuit

Abstract

The invention provides a design method based on a board-level power-supply current feedback circuit. According to the design method, four pins are adopted, the positions of two detection points are reserved, and network definitions of the power supply detection points and network definitions of the two ends of an inductor are separated in design; during component mounting, a pin of the inductor, an inductor bonding pad and detection point bonding pads are short-circuited. According to the design method, by means of reasonable design of packaging of the inductor, short-circuit pin devices are not used, accuracy of the power-supply feedback circuit is improved, schematic diagram designing and PCB designing efficiency is improved, the problems that PCB resistance affects design frequently and different positions of the short-circuit pin devices cannot keep current balance are solved, and the design method is beneficial to improving power supply design efficiency. The design method can be used for accurate feedback situations similarly. The design method is easy to implement and cannot increase cost.

Description

technical field [0001] The invention relates to the field of computer application technology, in particular to a design method based on a board-level power supply current feedback circuit. Background technique [0002] At present, current feedback mechanism is mostly used for high-current board-level power supplies. The role of current feedback is to determine the magnitude of the current flowing through the inductor by detecting the voltage on the inductor DCR. [0003] The design of current feedback considers the following aspects: 1. Eliminate the resistance on the PCB; 2. Ensure that the position of each power supply feedback is the same to maintain current balance; 3. How to control the accuracy to be small enough. [0004] Usually in the industry, the design of the industry usually selects the detection point artificially, or selects the current detection point in the form of short-circuiting the pin device. However, artificially controlling the detection point is no...

AI Technical Summary

Problems solved by technology

However, artificially controlling the detection point is not easy to control in terms of accuracy, and the error is relatively large; the method of short-circuiting the short-circuited pin device seems to improve the accuracy, but the error in placement will also cause a certain deviation in the accuracy. , Artificially place the short-circuit pin device, in order to pursue the accuracy of the placement position, it often takes a lot of time

Therefore, this method has the disadvantages that the accuracy is not easy to control and the design is complicated.

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