Long-distance AD (Analog/Digital) sampling circuit based on LVDS (Low Voltage Differential Signaling) and SIP (Serial Peripheral Interface) buses

Abstract

The invention provides a long-distance AD (Analog / Digital) sampling circuit based on LVDS (Low Voltage Differential Signaling) and SIP (Serial Peripheral Interface) buses. An LVDS bus circuit capable of performing long-distance high-speed digital communication between PCBs (Printed Circuit Boards) or on a PCB is connected between an SPI bus interface on a PCB where a CPU (Central Processing Unit) is positioned and an SPI bus interface on a PCB where an AD sampling chip is positioned in order that the CPU can realize direct sampling control and digital communication for long-distance AD sampling chips outside the PCBs or on the PCBs, so that additional CPU chips needing to be arranged on an AD sampling board are saved. Through adoption of the design, the cost of an electric power automatic protection device is reduced; the integration degree is increased; and the aim of the invention is fulfilled. Through practical application to a low-cost power distribution automatic protection product, the feasibility and reliability of the circuit and the timeliness and high degree of sampling speed are proved.

Description

technical field [0001] The present invention relates to a circuit design in which a CPU controls an AD chip to realize digital sampling in a power protection device, especially the long-distance control and sampling of the AD sampling chip where the CPU is located outside the PCB board, or the board is relatively far away. circuit design. technical background [0002] In the field of power system automation, digital protection and automation control devices are mainly used for protection monitoring of power lines, circuit breakers, transformers and other power facilities and control of stable operation of the power grid. An embedded computer system designed for the core processing unit, as well as a series of other peripheral electronic components such as AD sampling chips and memory. After years of development and application, the design of these devices increasingly requires low cost and integration, while the protection target or scope is constantly increasing. Traditio...

AI Technical Summary

Problems solved by technology

However, the SPI bus is mainly used for long-distance communication on the PCB board. When doing inter-board or long-distance communication on the board, the communication rate is difficult to meet the sampling requirements.

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