CN205283502U

CN205283502U - Two buses sample data receiving circuit that floats

Info

Publication number: CN205283502U
Application number: CN201521109256.2U
Authority: CN
Inventors: 踪家帅; 踪念品; 徐伦
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-29
Filing date: 2015-12-29
Publication date: 2016-06-01
Anticipated expiration: 2025-12-29

Abstract

The utility model relates to a two buses sample data receiving circuit that floats, by the unsteady sampling circuit of voltage, signal shaping circuit constitutes, characterized by voltage floats the voltage variation of sampling circuit on to two buses and samples, discernment high -low level signal, and the advantage only volume of detecting the change of sampling of firstly floating even bus terminal voltage is lower, as long as bus voltage variation is within the settlement scope, can all be improved the reception sensitivity by effective detection, improves the data ability of receiving, improves sampling adaptability and reliability, even total line voltage decay during long distance transmission also can normally detect the signal through unsteady sampling circuit of voltage and signal shaping circuit. Secondly, circuit structure is simple, and components and parts are few, and is with low costs, thirdly, the commission repair of being convenient for.

Description

A kind of two lines bus floating sampled data receives circuit

Technical field

This utility model relates to two line communication technical field, particularly relates to a kind of two lines bus floating sampled data and receives circuit.

Background technology

On two lines bus traditional at present equipment distance power supply farther out or equipment more, bus pressure drop is different, and general two lines bus sampling fixed voltage distinguishes low and high level signal, and two lines bus end cannot normally detect signal, and reliability reduces; , there is debugging difficulty, it is difficult to the shortcomings such as maintenance in general two lines bus data receiver circuit complicated structure.

Summary of the invention

Goal of the invention:

In order to avoid the weak point existed in background technology, devise a kind of two lines bus floating sampled data and receive circuit, there is simple in construction, improve data reception capabilities, improve the two lines bus data receiver circuit of data sampling adaptability and reliability.

Technical scheme:

A kind of two lines bus floating sampled data involved by this utility model receives circuit, including: voltage floating sample circuit, signal transformation circuit.

Described voltage floating sample circuit includes: resistance R1, R2, R3, R4, electric capacity C1, C2, audion Q1; Resistance R1, R2 connect bus; Wherein another termination capacitor C1 positive pole of R1 and audion Q1 emitter stage; Electric capacity C1 minus earth, the resistance R2 other end is connected with audion Q1 base stage; Audion Q1 colelctor electrode is connected with resistance R3, electric capacity C2, and resistance R3 other end ground connection, the electric capacity C2 other end is connected with resistance R4 one end as voltage floating sample circuit outfan, resistance R4 other end ground connection.

Described signal transformation circuit includes: resistance R5, R6, NAND gate U1A; The pin 1,2 of NAND gate U1A connects voltage floating sample circuit outfan, and the pin 3 of NAND gate U1A connects resistance R5, the resistance R5 other end and resistance R6 one end as signal transformation circuit outfan, resistance R6 other end ground connection.

Being in high level state during the transmission of two lines bus no data, electric capacity C1 is charged by this high level through resistance R1, and the voltage of C1 is substantially identical with bus high level voltage, and audion Q1 is in cut-off state, colelctor electrode output low level; Microprocessor input does not have signal; When bus has data to transmit, bus can be drawn as low level, and at this moment audion Q1 emitter voltage is higher than base stage, and triode turns on, colelctor electrode output high level.

Further, voltage floating sample circuit signal output part connects signal transformation circuit, is input to microprocessor by signal transformation circuit.

Advantage and effect:

This utility model is compared with background technology, and advantage one is to float to sample only to detect variable quantity, even if terminal bus voltage is relatively low, as long as bus voltage changes within set point, can effectively be detected, improved receiving sensitivity, improve data reception capabilities, improve sampling adaptability and reliability; Even if bus voltage decay, also is able to signal is normally detected through overvoltage floating sample circuit and signal transformation circuit during long-distance transmissions; Two is that circuit structure is simple, and components and parts are few, and cost is low; Three are easy for debugging maintenance.

Accompanying drawing illustrates:

Fig. 1: a kind of two lines bus floating sampled data receives circuit structure diagram.

Detailed description of the invention:

Below in conjunction with the drawings and specific embodiments, this utility model being described further, this utility model protection domain is not only limited to the statement of herein below.

Described a kind of two lines bus floating sampled data receives circuit (Fig. 1), including: voltage floating sample circuit, signal transformation circuit.

Described voltage floating sample circuit: data connect resistance R1, R2 from VIN input; Wherein another termination capacitor C1 positive pole of R1 and audion Q1 emitter stage; Electric capacity C1 minus earth, the resistance R2 other end is connected with audion Q1 base stage; Audion Q1 colelctor electrode is connected with resistance R3, electric capacity C2, resistance R3 other end ground connection, and the electric capacity C2 other end is connected as voltage floating sample circuit outfan, resistance R4 other end ground connection with resistance R4 one end; By resistance R1, R2, R3, R4, electric capacity C1, C2, voltage variety in bus is detected by the voltage floating sample circuit of audion Q1 composition.

The pin 1,2 of described signal transformation circuit: NAND gate U1A connects voltage floating sample circuit outfan, and the pin 3 of NAND gate U1A connects resistance R5, the resistance R5 other end and resistance R6 one end as signal transformation circuit outfan, resistance R6 other end ground connection; By resistance R5, R6, signal is carried out shaping by the signal transformation circuit of NAND gate U1A composition.

It is understandable that, above with respect to specific descriptions of the present utility model, it is merely to illustrate this utility model and is not limited to the technical scheme described by this utility model embodiment, it will be understood by those within the art that, still this utility model can be modified or equivalent replacement, to reach identical technique effect; Using needs as long as meeting, all within protection domain of the present utility model, the content not being described in detail in this utility model description belongs to the known technology of those skilled in the art.

Claims

1. two lines bus floating sampled data receives a circuit, including: voltage floating sample circuit, signal transformation circuit;

Described voltage floating sample circuit includes: resistance R1, R2, R3, R4, electric capacity C1, C2, audion Q1; Resistance R1, R2 connect bus; Wherein another termination capacitor C1 positive pole of R1 and audion Q1 emitter stage; Electric capacity C1 minus earth, the resistance R2 other end is connected with audion Q1 base stage; Audion Q1 colelctor electrode is connected with resistance R3, electric capacity C2, resistance R3 other end ground connection, and the electric capacity C2 other end is connected as voltage floating sample circuit outfan, resistance R4 other end ground connection with resistance R4 one end;