CN202025203U

CN202025203U - Feeding type communication circuit

Info

Publication number: CN202025203U
Application number: CN2011201036676U
Authority: CN
Inventors: 陈童静
Original assignee: MENRED CONTROLS SYSTEM (YUEQING) CO Ltd
Current assignee: Zhejiang Menred Comfort Systems Co.,Ltd.
Priority date: 2011-04-03
Filing date: 2011-04-03
Publication date: 2011-11-02
Anticipated expiration: 2021-04-03

Abstract

The utility model relates to a feeding type communication circuit, comprising a first communication circuit and a second communication circuit, wherein the first communication circuit is connected with the second communication circuit via a communication interface, signals between the first communication circuit and the second communication circuit and a power supply share one connecting line; the direct-current power supply supplies power for the first communication circuit after voltage stabilization via a first voltage stabilizing circuit, and is simultaneously connected with the communication interface after voltage stabilization via a first data transmitting circuit; and after rectification by a rectifier bridge and voltage stabilization by a second voltage stabilizing circuit, the power supply from the communication interface supplies power for the second communication circuit, and the signals from the communication interface are transmitted to a one-chip microcomputer via a second data receiving circuit. Advantages of the utility model lie in that the communication circuit is compatible with both power supply and communication functions, two nonpolarity wires are used for connecting; and the communication circuit is convenient in wiring, with few wires used, is good in anti-interference, long in communication distance, and can be applicable to a plurality of places.

Description

A kind of feed type communicating circuit

Technical field:

The utility model belongs to the communicating circuit of electric signal, particularly relates to a kind of feed type communicating circuit.

Background technology:

Drag in many principal and subordinate's machine communicating circuits at one-to-one,, slave is powered by main frame, and and host communication, in the existing circuit, communication line and supply line separate, and adopt the connected mode of three-wire system or four-wire system, and promptly connecting line has three or four, wherein two is respectively the positive and negative of power supply, and another root or two are the communication signal lines.

There are following shortcoming in three-wire system or four-wire system communicating circuit: (1) three line or four lines can not wrongs, otherwise not only can cause communication undesired, even can burn circuit; (2) wiring: communication between main frame and the slave, need between main frame and slave, connect up, three-wire system or four-wire system communicating circuit then need be between main frame and slave three lines of cloth or four lines.

Introduced a kind of two-wire power supply communication circuit of air conditioner controllers in the patent 201010158359.3, though this circuit is to annex feed circuit and communicating circuit, but this circuit adopts the energy storage of series inductance L1 to be used for eliminating the influence of communication signal to the 12V direct supply, certainly will limit the length of pulse width, connection; If pulse width is widened, inductance L 1 just can not well be stablized preceding step voltage, and pulse width is 10us in this patent, narrow pulse width like this, and under long distance communication, interference free performance is non-constant.

Summary of the invention:

The purpose of this utility model provides a kind of feed type communicating circuit, and compatible power supply of communicating circuit and communication function only need two lines, the branch that does not have polarity between two lines, though wrong, also can the operate as normal communication, anti-interference is good simultaneously, and communication distance can reach about 1 km.So this feed type communicating circuit, not only easy-to-connect has reduced wiring quantity, and anti-interference is good, and communication distance is far away, applicable to multiple field of employment.

For achieving the above object, the utility model adopts following technical scheme: a kind of feed type communicating circuit, comprise first communicating circuit and second communicating circuit, described first communicating circuit is connected by communication interface with second communicating circuit, it is characterized in that: connecting line of communication signal between first communicating circuit and second communicating circuit and power sharing; Direct supply VDD is the power supply of first communicating circuit through mu balanced circuit (1) voltage stabilizing, simultaneously through first data transmit circuit (2) voltage stabilizing incoming communication interface; Power supply that second communicating circuit comes communication interface and communication signal are that second communicating circuit is powered after inserting second mu balanced circuit (4) voltage stabilizing after by the rectifier bridge rectification, and communication signal is sent into single-chip microcomputer IC2 through second data receiver circuit (6).

In the such scheme, specifically being constructed as follows of described first communicating circuit: comprise first mu balanced circuit (1), first data transmit circuit (2) and first data receiver circuit (3); Described first data transmit circuit (2) comprises triode Q11 and stabilivolt U12; The base stage of described triode Q11 is through capacitor C 12 ground connection, insert the TXD mouth of single-chip microcomputer IC1 simultaneously behind the resistance in series R11, the grounded emitter of triode Q11, the collector of triode Q11 is connected with the adjustable side Adj of stabilivolt U12, connect resistance R 12, R13 simultaneously, resistance R 13 other end ground connection, output terminal and the resistance R 14 of resistance R 12 another termination stabilivolt U12, the news port is connected in the input port of resistance R 14 another termination fuse F11 and first data receiver circuit (3), the fuse F11 other end; The input end of stabilivolt U12 is connected with direct supply VDD, through capacitor C 11 ground connection; Described first data receiver circuit (3) comprises comparer U13 and diode D11; Described comparer U13 output terminal inserts power supply VCC through resistance R 15, and inserts the RXD mouth of single-chip microcomputer IC1; The in-phase input end of comparer U13 is through capacitor C 14 ground connection, and inserts the input port of first data receiver circuits (3) by resistance R 18; The inverting input of comparer U13 is through capacitor C 13, resistance R 16 ground connection in parallel, and inserts the input port of first data receiver circuit (3) by resistance R 17, diode D11 series connection.

Specifically being constructed as follows of described second communicating circuit: comprise second mu balanced circuit (4), second data transmit circuit (5) and second data receiver circuit (6); Described first data transmit circuit (5) comprises triode Q21 and resistance R 24; The base stage of described triode Q21 inserts the TXD mouth of single-chip microcomputer IC2 simultaneously through capacitor C 25 ground connection behind the resistance in series R24, ground connection behind the emitter resistance in series R23 of triode Q21, and the collector of triode Q21 inserts signal input; Described second data receiver circuit (6) comprises diode D22, D23 and triode Q22; The base stage of described triode Q22 is through resistance R 26 ground connection, and by resistance R 25, diode D23, D22 series connection access signal input, the grounded emitter of triode Q22, the collector of triode Q22 inserts the RXD mouth of single-chip microcomputer IC2, and inserts power supply VCC1 through resistance R 27.

The utility model adopts Manchester's cde carrier modulation principle, the shared connecting line of power supply and communication signal.Not only less demanding to the communication wire rod, common wiring just can use, and wiring is convenient, does not have the branch of polarity, the situation of wiring error can not occur, and anti-interference is good, and communication distance is far away, is applicable to one-to-one, and one drags in many a, control, the control communication line how.

Description of drawings

Fig. 1 is the first communicating circuit schematic diagram of 201010158359.3 1 kinds of two-wire power supply communication circuit of air conditioner controllers of patent;

Fig. 2 is the first communicating circuit schematic diagram of the present utility model, i.e. host communication circuit theory diagrams;

Fig. 3 is the second communicating circuit schematic diagram of the present utility model, i.e. slave communicating circuit schematic diagram;

Fig. 4 is the timing chart that produces on connection.

Embodiment

The utility model is connected between main frame and the slave, comprise first communicating circuit of main frame and second communicating circuit of slave, first communicating circuit is connected by communication interface with second communicating circuit, the particular circuit configurations of first communicating circuit is seen Fig. 2, and the particular circuit configurations of second communicating circuit is seen Fig. 3.

(1) is first mu balanced circuit among Fig. 2, and (2) are first data transmit circuit, and (3) are first data receiver circuit.

(4) are second mu balanced circuit among Fig. 3, and (5) are second data transmit circuit, and (6) are second data receiver circuit.

As shown in Figure 2, specifically being constructed as follows of first communicating circuit: comprise first mu balanced circuit (1), first data transmit circuit (2) and first data receiver circuit (3); Described first data transmit circuit (2) comprises triode Q11 and stabilivolt U12; The base stage of described triode Q11 is through capacitor C 12 ground connection, insert the TXD mouth of single-chip microcomputer IC1 simultaneously behind the resistance in series R11, the grounded emitter of triode Q11, the collector of triode Q11 is connected with the adjustable side Adj of stabilivolt U12, connect resistance R 12, R13 simultaneously, resistance R 13 other end ground connection, output terminal and the resistance R 14 of resistance R 12 another termination stabilivolt U12, the news port is connected in the input port of resistance R 14 another termination fuse F11 and first data receiver circuit (3), the fuse F11 other end; The input end of stabilivolt U12 is connected with direct supply VDD, through capacitor C 11 ground connection; Described first data receiver circuit (3) comprises comparer U13 and diode D11; Described comparer U13 output terminal inserts power supply VCC through resistance R 15, and inserts the RXD mouth of single-chip microcomputer IC1; The in-phase input end of comparer U13 is through capacitor C 14 ground connection, and inserts the input port of first data receiver circuits (3) by resistance R 18; The inverting input of comparer U13 is through capacitor C 13, resistance R 16 ground connection in parallel, and inserts the input port of first data receiver circuit (3) by resistance R 17, diode D11 series connection.

As shown in Figure 3, specifically being constructed as follows of second communicating circuit: comprise second mu balanced circuit (4), second data transmit circuit (5) and second data receiver circuit (6); Described first data transmit circuit (5) comprises triode Q21 and resistance R 24; The base stage of described triode Q21 inserts the TXD mouth of single-chip microcomputer IC2 simultaneously through capacitor C 25 ground connection behind the resistance in series R24, ground connection behind the emitter resistance in series R23 of triode Q21, and the collector of triode Q21 inserts signal input; Described second data receiver circuit (6) comprises diode D22, D23 and triode Q22; The base stage of described triode Q22 is through resistance R 26 ground connection, and by resistance R 25, diode D23, D22 series connection access signal input, the grounded emitter of triode Q22, the collector of triode Q22 inserts the RXD mouth of single-chip microcomputer IC2, and inserts power supply VCC1 through resistance R 27.

The course of work and principle

See Fig. 2, direct supply VDD is not only by after first mu balanced circuit (1) voltage stabilizing being first communicating circuit power supply, and by incoming communication interface after the stabilivolt U12 voltage stabilizing in first data transmit circuit (2), gives the power supply of second communicating circuit by communication interface.

When single-chip microcomputer IC1 sends data, its TXD pin output positive pulse signal control triode Q11 conducting, voltage adjustment characteristic according to LM317, the output voltage of stabilivolt U12 is reduced to about about 1.5V, a series of pulse signals as shown in Figure 4 on communication line, have just been produced like this, because pulse width is 416us, has guaranteed good anti-interference, has reduced the line that produces because of the connection lengthening and disturbed and environmental interference; Voltage on the connection is to be produced by the output voltage of stabilivolt U12, and therefore, the communication signal on the connection can not have influence on step voltage before the stabilivolt U12.

When single-chip microcomputer IC1 received data, the communication voltage signal was through the in-phase input end of resistance R 18 access comparer U13, and simultaneously, communication signal inserts the inverting input of comparer U13 through diode D11, resistance R 17 series connection; When the communication interface pulse-free signal, the in-phase input end voltage of comparer U13 is higher than inverting input voltage, the output terminal output high level of comparer U13; When communication interface has pulse signal, the pulse signal that second data transmit circuit sends drags down communication line voltage, and capacitor C 14 capacity are little, can discharge rapidly by resistance R 18, the in-phase input end voltage of comparer U13 drags down rapidly, and capacitor C 13 capacity are big, and because the unidirectional characteristic of diode D11, can only be by resistance R 16 discharges, resistance R 16 resistances are big, discharge time is slow, therefore the inverting input voltage of comparer U13 slowly reduces, thereby during this section of pulse pulsewidth, the in-phase input end voltage of comparer U13 is lower than inverting input voltage, the output terminal output low level of comparer U13, the RXD mouth of single-chip microcomputer IC1 is received pulse signal.

See Fig. 3, the power supply communication signal from first communicating circuit will not be subjected to the polarity effect of communication interface wiring by after the rectifier bridge D1 rectification.Power supply through the second mu balanced circuit voltage stabilizing, offers second communicating circuit by resistance R 21, diode D21 series connection, and because of the unidirectional characteristic of diode, mu balanced circuit can not influence the communication signal before the diode D21.

When single-chip microcomputer IC2 sent data, its TXD mouth output positive pulse signal control triode Q21 conducting dragged down the power supply communication signal, forms a series of pulse signals as shown in Figure 4.

When single-chip microcomputer IC2 received data, when pulse-free signal, the power supply communication signal after the rectification was a high voltage, through utmost point pipe D22, D23, resistance R 25, made triode Q22 conducting, and the RXD mouth of single-chip microcomputer IC2 is a low level; When pulse signal, because of about the about 1.5V of pulse signal, through diode D22 and D23 dividing potential drop, triode Q22 ends, and the RXD mouth of Dan Banji IC2 is a high level.

Claims

1. feed type communicating circuit, comprise first communicating circuit and second communicating circuit, described first communicating circuit is connected by communication interface with second communicating circuit, it is characterized in that: connecting line of communication signal between first communicating circuit and second communicating circuit and power sharing; Direct supply through first surely too circuit (1) voltage stabilizing be first communicating circuit power supply, simultaneously through first data transmit circuit (2) voltage stabilizing incoming communication interface; Power supply that second communicating circuit comes communication interface and communication signal are that second communicating circuit is powered after inserting second mu balanced circuit (4) voltage stabilizing after by the rectifier bridge rectification, and communication signal is sent into single-chip microcomputer IC2 through second data receiver circuit (6).

2. according to a kind of feed type communicating circuit described in the claim 1, it is characterized in that: specifically being constructed as follows of described first communicating circuit: comprise first mu balanced circuit (1), first data transmit circuit (2) and first data receiver circuit (3); Described first data transmit circuit (2) comprises triode Q11 and stabilivolt U12; The base stage of described triode Q11 is through capacitor C 12 ground connection, insert the TXD mouth of single-chip microcomputer IC1 simultaneously behind the resistance in series R11, the grounded emitter of triode Q11, the collector of triode Q11 is connected with the adjustable side Adj of stabilivolt U12, connect resistance R 12, R13 simultaneously, resistance R 13 other end ground connection, output terminal and the resistance R 14 of resistance R 12 another termination stabilivolt U12, the news port is connected in the input port of resistance R 14 another termination fuse F11 and first data receiver circuit (3), the fuse F11 other end; The input end of stabilivolt U12 is connected with direct supply VDD, through capacitor C 11 ground connection; Described first data receiver circuit (3) comprises comparer U13 and diode D11; Described comparer U13 output terminal inserts power supply VCC through resistance R 15, and inserts the RXD mouth of single-chip microcomputer IC1; The in-phase input end of comparer U13 is through capacitor C 14 ground connection, and inserts the input port of first data receiver circuits (3) by resistance R 18; The inverting input of comparer U13 is through capacitor C 13, resistance R 16 ground connection in parallel, and inserts the input port of first data receiver circuit (3) by resistance R 17, diode D11 series connection.

3. according to a kind of feed type communicating circuit described in the claim 1, it is characterized in that: specifically being constructed as follows of described second communicating circuit: comprise second mu balanced circuit (4), second data transmit circuit (5) and second data receiver circuit (6); Described first data transmit circuit (5) comprises triode Q21 and resistance R 24; The base stage of described triode Q21 inserts the TXD mouth of single-chip microcomputer IC2 simultaneously through capacitor C 25 ground connection behind the resistance in series R24, ground connection behind the emitter resistance in series R23 of triode Q21, and the collector of triode Q21 inserts signal input; Described second data receiver circuit (6) comprises diode D22, D23 and triode Q22; The base stage of described triode Q22 is through resistance R 26 ground connection, and by resistance R 25, diode D23, D22 series connection access signal input, the grounded emitter of triode Q22, the collector of triode Q22 inserts the RXD mouth of single-chip microcomputer IC2, and inserts power supply VCC1 through resistance R 27.