CN210624840U

CN210624840U - Two-wire power supply communication circuit

Info

Publication number: CN210624840U
Application number: CN201921144666.9U
Authority: CN
Inventors: 姚春良; 王军伟
Original assignee: Ningbo Shengjiu Cabinets Lock Co Ltd
Current assignee: Ningbo Shengjiu Technology Co.,Ltd.
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-05-26
Anticipated expiration: 2029-07-19

Abstract

The utility model relates to a two-wire power supply communication circuit is to the host computer in the current like product is used and power supply, communication circuit connection between the machine set up inconveniently, and difficult simultaneous use is common technical problem and design. The main point is that a serial port sending end TX of a host in the circuit leads out a ground wire GND through a resistor R2, a serial port receiving end RX of the host passes through a resistor R1, a power supply VCC of the host passes through a SW high-speed electronic switch, and a communication power supply line in a two-line interface; meanwhile, a serial port transmitting end TX1 of the slave passes through a diode D1, a serial port receiving end RX1 of the slave passes through a current-limiting resistor, a power supply VCC of the slave passes through a diode D2, a communication power supply line in the two-wire interface leads out a ground wire GND1, and the master and the slave are connected through the two-wire interface. Therefore, the diode D1 of the slave ensures normal realization and universality of two-wire power supply communication and meets the normal communication of various slave processors during two-wire communication power supply.

Description

Two-wire power supply communication circuit

Technical Field

The utility model relates to a power supply communication circuit is a two-line power supply communication circuit.

Background

At present, the serial port communication between the host and the slave machine commonly used has a four-wire mode (two power wires, two ground wires and two communication transceivers) and a three-wire mode (one power wire, one ground wire and one communication transceiver), and the mode of a two-wire power supply communication circuit is less adopted for connection. Although some existing devices employ two-wire power supply communication, such as the application No. 201010158359.3 disclosed in chinese patent literature, application publication No. 2010.03.12 entitled "two-wire power supply communication circuit of air conditioner controller"; however, the last circuit and the like are difficult to be applied to certain scenes with short distance, small interface and small circuit space to realize serial communication and power supply between the host and the slave.

Disclosure of Invention

In order to overcome the defects, the utility model aims to provide a two-line power supply communication circuit for the field, which solves the technical problems that the connection of the host and the slave machines is inconvenient and the shared communication circuit is difficult to use simultaneously when the host and the slave machines are used in the prior similar products. The purpose is realized by the following technical scheme.

A two-wire power supply communication circuit comprises a power supply end, a host end and a slave end, wherein the host end and the slave end exchange data with each other; the device is characterized in that a serial port sending end TX of the host machine is connected with a three-wire into a communication power supply line in a two-wire interface through a resistor R2, a serial port receiving end RX of the host machine is connected with a resistor R1 and a power supply VCC of the host machine is connected with a SW high-speed electronic switch respectively, and a ground wire of the host machine is led out independently to be used as a ground wire GND in the two-wire interface; meanwhile, a serial port transmitting end TX1 of the slave machine passes through a diode D1, a serial port receiving end RX1 of the slave machine passes through a current-limiting resistor, a power supply VCC of the slave machine passes through a diode D2, three wires are connected to form a communication power supply line in a two-wire interface respectively, and the ground wire of the slave machine is led out independently to be used as a ground wire GND1 in the two-wire interface; the master machine and the slave machine are connected through a two-wire interface, a communication power supply line of the master machine is connected or contacted with a communication power supply line of the slave machine, and a ground wire GND of the master machine is connected or contacted with a ground wire GND1 of the slave machine. The main processor of the host controls the 'SW high-speed electronic switch' to realize the time-sharing management of power supply and communication, and the 'SW high-speed electronic switch' is in a power supply mode at ordinary times to supply power to the slave; the slave acquires electric energy, the processor of the slave works and stores the electric energy in a C1 energy storage capacitor of the slave; when the host needs to communicate with the slave, the host controls the SW high-speed electronic switch to be switched to a communication mode, and the C1 energy storage capacitor of the slave temporarily supplies power to the slave when the host is in the communication mode, so that the working of a processor of the slave is maintained, and the communication with the host is completed; the slave machine immediately returns the information required by the host machine after receiving the information sent by the host machine, and the main processor is switched back to the power supply mode through the SW high-speed electronic switch after the host machine receives the information. The diode D1 of the slave ensures normal realization and universality of two-wire power supply communication, and meets the normal communication of various slave processors during two-wire communication power supply.

And the current limiting resistor of the slave is connected with a small current limiting resistor in series, so that the slave is reserved as a protection interface for use.

The utility model has simple and reasonable structural design, feasible production and manufacture, simple and reliable interface process, lower production cost, wide application range, high communication speed and good universality; the two-wire power supply communication circuit is particularly suitable for being used as a two-wire power supply communication circuit between a host and a slave in an electrical cabinet and the structural improvement of the similar products.

Drawings

Fig. 1 is a schematic diagram of a two-wire interface power supply communication circuit of the present invention.

Detailed Description

The structure of the present invention will now be further described with reference to the accompanying drawings. As shown in fig. 1, the circuit includes a power supply terminal, and a host terminal and a slave terminal that exchange data with each other, where the power supply supplies power to the host terminal and the slave terminal, and the host terminal and the slave terminal are respectively provided with a master processor and a slave processor, and perform data communication through serial communication. The host computer 'serial port transmitting end TX' is connected with a three-wire to form a 'communication power supply line' in a 'two-wire interface' through a 'resistor R2', the host computer 'serial port receiving end RX' is connected with a 'resistor R1' and the host computer 'power VCC' is connected with a 'SW high-speed electronic switch', and the host computer ground wire is independently led out to form a 'ground wire GND' in the 'two-wire interface'; the three wires of the slave are connected to form a communication power supply wire in the two-wire interface through a diode D1 from a serial port transmitting end TX1 of the slave and a current-limiting resistor from a serial port receiving end RX1 of the slave and a diode D2 from a power supply VCC of the slave, and the communication power supply wire is independently led out from the ground wire of the slave to form a ground wire GND1 in the two-wire interface; the master machine and the slave machine are connected through a two-wire interface, the communication power supply line of the master machine is connected or contacted with the communication power supply line of the slave machine, and the ground line GND of the master machine is connected or contacted with the ground line GND1 of the slave machine.

The utility model relates to a host computer and follow two lines power supply communication circuit of serial ports communication between the machine can extensively be applicable to short distance passive equipment control field, be applied to from the machine no power supply, the interface requires simple electronic equipment. The circuit provides a two-wire power supply communication circuit which can supply power and transmit information on the basis of two wires. The communication is carried out in a two-line mode, namely one ground wire and one power supply communication line, and the power supply communication line is subjected to time-sharing management through a host machine and supplies power and carries out two-way communication for a slave machine; the two-wire interface power supply communication method of the circuit meets the requirement of the slave machine for controlling large-current equipment in a time-sharing management mode, has the advantages of high communication speed, good universality, simple and reliable interface process, low cost and the like, and meets the requirement of industrial mass production. The circuit changes the original four-wire and three-wire communication modes into two-wire communication modes, adopts the most common serial communication mode, and completes the two-wire interface mode of power supply communication through a plurality of simple components.

Claims

1. A two-wire power supply communication circuit comprises a power supply end, a host end and a slave end, wherein the host end and the slave end exchange data with each other; the device is characterized in that a serial port sending end TX of the host machine is connected with a three-wire into a communication power supply line in a two-wire interface through a resistor R2, a serial port receiving end RX of the host machine is connected with a resistor R1 and a power supply VCC of the host machine is connected with a SW high-speed electronic switch respectively, and a ground wire of the host machine is led out independently to be used as a ground wire GND in the two-wire interface; meanwhile, a serial port transmitting end TX1 of the slave machine passes through a diode D1, a serial port receiving end RX1 of the slave machine passes through a current-limiting resistor, a power supply VCC of the slave machine passes through a diode D2, three wires are connected to form a communication power supply line in a two-wire interface respectively, and the ground wire of the slave machine is led out independently to be used as a ground wire GND1 in the two-wire interface; the master machine and the slave machine are connected through a two-wire interface, a communication power supply line of the master machine is connected or contacted with a communication power supply line of the slave machine, and a ground wire GND of the master machine is connected or contacted with a ground wire GND1 of the slave machine.

2. A two-wire power supply communication circuit according to claim 1, characterised in that the current limiting resistor of the slave is connected in series with a small current limiting resistor.