Short circuit protection and overload detection circuit for MBus main station circuit

Abstract

The invention relates to the technical field of communication, and discloses a short circuit protection and overload detection circuit for an MBus main station circuit. The short circuit protection and overload detection circuit includes a short circuit protection sub-circuit, an overload detection sub-circuit and an MBus output sub-circuit which are connected by wires and mounted on a circuit board. The short circuit protection sub-circuit uses a self-recovering fuse as a protection component and has the characteristics of fast response, high reliability, automatic recovery and the like. Theoverload detection sub-circuit inputs a sampled voltage signal into a base stage of a NPN-type silicon triode, outputs an overload signal when the voltage signal exceeds conduction voltage of the triode and has the characteristics of simple structure, convenient use and the like. The circuit of the invention is simple, reliable, convenient in use, easy in implementation and low in equipment cost,and so the short circuit protection and overload detection circuit of the invention has a good application prospect.

Description

[0001] The invention relates to the technical field of communication, in particular to a short-circuit protection and overload detection circuit used for an MBus master station circuit. Background technique [0002] As a master-slave half-duplex communication technology, MBus has the characteristics of strong anti-interference ability, long communication distance, and flexible and diverse power supply methods. It is widely used in data acquisition of various smart instruments. The short-circuit protection and overload protection circuits of the traditional MBus master circuit are often complex, and the reliability is not high. The complex circuit leads to increased cost, and the low reliability will cause the MBus master circuit to be damaged when the MBus bus is short-circuited, or when it is overloaded. cause a communication error. Contents of the invention [0003] In view of the above problems, the present invention provides a circuit structure simple and reliable, stron...

AI Technical Summary

Problems solved by technology

The short-circuit protection and overload protection circuits of the traditional MBus master circuit are often complex, and the reliability is not high. The complex circuit leads to increased cost, and the low reliability will cause the MBus master circuit to be damaged when the MBus bus is short-circuited, or when it is overloaded. causing a communication error

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