CN209517095U

CN209517095U - A kind of the CIU communicating circuit and its meter of meter

Info

Publication number: CN209517095U
Application number: CN201822177810.0U
Authority: CN
Inventors: 孟遥; 郑哲; 张宇航
Original assignee: Ningbo Sanxing Smart Electric Co Ltd
Current assignee: Ningbo Sanxing Smart Electric Co Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2019-10-18
Anticipated expiration: 2028-12-24

Abstract

The utility model relates to a kind of CIU communicating circuits of meter, in meter, for passing through data sending terminal and data receiver and CIU module communication, it is characterized by comprising signal sending controling circuits, communication interface circuit and signal receive control circuit, the input terminal of the data sending terminal connection signal sending controling circuit, the output end of the signal sending controling circuit connects the communication interface circuit, one end of the communication interface circuit connects CIU module, the other end connection signal of the communication interface circuit receives control circuit, and the signal receives the output end connection data receiver of control circuit.Also disclose a kind of meter.Advantage is: being made up of discrete part, builds CIU communicating circuit using triode and metal-oxide-semiconductor as core, reduce costs, and layout of the communicating circuit on pcb board is more flexible, reliability and Electro Magnetic Compatibility are higher, not vulnerable to external interference.

Description

A kind of the CIU communicating circuit and its meter of meter

Technical field

The utility model relates to communication field, in particular to the CIU communicating circuit and its meter of a kind of meter.

Background technique

CIU, that is, handset user unit, for the data interaction between user and meter, wherein can be used for ammeter, water meter or The data query of gas meter, flow meter and the operation such as supplement with money, the CIU communicating circuit in domestic and overseas meter instrument generally uses at present CIU integrated chip cooperates the design method of peripheral circuit, and for the communicating circuit, presently, there are following problems:

1, when using integrated chip composition CIU communicating circuit, integrated chip has very big limitation to pcb board layout, past Toward needing bigger space to carry out monolith placement, substantially reduce the layout flexibility of pcb board；

2, since the integration of the chip in CIU communicating circuit is higher, in the side such as Electro Magnetic Compatibility and reliability The performance in face is poor, is easy by extraneous interference；

3, the CIU communicating circuit built by integrated chip, it is expensive, and when some component wear, it is not easy to repair, it needs Entire replacement.

Therefore, existing CIU communicating circuit there are aiming at the problem that, require further improvement.

Utility model content

First technical problem to be solved in the utility model is the status for the prior art, provides a kind of discrete And the CIU communicating circuit of the more flexible meter of layout.

Second technical problem to be solved in the utility model is the status for the prior art, is provided a kind of with upper State the meter of CIU communicating circuit.

The utility model solves technical solution used by above-mentioned first technical problem are as follows: a kind of CIU communication of meter Circuit is set in meter, for passing through data sending terminal and data receiver and CIU module communication, it is characterised in that: including letter Number sending controling circuit, communication interface circuit and signal receive control circuit, and the data sending terminal connection signal sends control The input terminal of circuit, the output end of the signal sending controling circuit connect the communication interface circuit, the communication interface electricity The one end on road connects CIU module, and the other end connection signal of the communication interface circuit receives control circuit, and the signal connects The output end for receiving control circuit connects data receiver.

As an improvement, the signal sending controling circuit includes the first triode, the second triode, third transistor, the One resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, the 6th electricity of data sending terminal connection One end of resistance, the base stage of the other end connection third transistor of the 6th resistance, the emitter ground connection of the third transistor, The collector of the third transistor connects one end of the 5th resistance, and the other end of the 5th resistance is separately connected the one or three pole The base stage of the collector of pipe and the second triode, the base stage of first triode connect the emitter of second triode, One end of the emitter connection first resistor of first triode, the other end of the first resistor are separately connected the second electricity Resistance, 3rd resistor and the 4th resistance one end, and the junction of first resistor and second resistance, 3rd resistor and the 4th resistance it Between connect first voltage, the second resistance, 3rd resistor and the 4th resistance are successively in parallel, the second resistance, 3rd resistor The connecting line of the base stage of the first triode and the emitter of the second triode is connected to the 4th resistance other end interconnected Between, the output end of the current collection of second triode extremely signal sending controling circuit.

Further, the communication interface circuit includes first diode, the second diode and thirteenth resistor, and described The anode of the collector connection first diode of two triodes, the cathode of the first diode connect second diode The one of thirteenth resistor is also connected between the connecting line of the anode of anode, the cathode of the first diode and the second diode End, the other end ground connection of the thirteenth resistor, the cathode and the second diode of the thirteenth resistor and first diode The junction of anode is interface end.

Specifically, the communication interface circuit is connected by interface end with CIU module.

Further, the signal receive control circuit include the 4th triode, metal-oxide-semiconductor, the 7th resistance, the 8th resistance, The cathode of 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor, second diode is separately connected the 9th resistance With one end of twelfth resistor, the other end of the twelfth resistor is grounded, and the other end of the 9th resistance is separately connected the One end of eight resistance and the grid of metal-oxide-semiconductor, the other end of the 8th resistance connect one end of the 7th resistance, the 7th resistance The other end connect first voltage, the source electrode of the metal-oxide-semiconductor connects between the 7th resistance and the connecting line of the 8th resistance, described One end of the drain electrode connection eleventh resistor of metal-oxide-semiconductor, the other end of the eleventh resistor connect the base stage of the 4th triode, institute The emitter ground connection of the 4th triode is stated, the collector of the 4th triode connects one end of the tenth resistance, the tenth electricity The other end of resistance connects second voltage, and the data receiver is connected between the 4th triode and the connecting line of the tenth resistance.

Preferably, the metal-oxide-semiconductor is PMOS tube.

Preferably, first triode is PNP pipe, second triode is PNP pipe, and the third transistor is PNP pipe.

Preferably, the 4th triode is NPN pipe.

In the present solution, the meter is ammeter, water meter or gas meter, flow meter.

The utility model solves technical solution used by above-mentioned second technical problem are as follows: a kind of meter, feature exist In: there is above-mentioned CIU communicating circuit.

Compared with the prior art, the advantages of the utility model are: being communicated in the prior art by the CIU that integrated chip is built There are at high cost and be laid out on pcb board existing space constraints in circuit, which passes through discrete part Composition, builds CIU communicating circuit using triode and metal-oxide-semiconductor as core, reduces costs, and the communicating circuit is on pcb board It is laid out more flexible, reliability and Electro Magnetic Compatibility are higher, not vulnerable to external interference, solve CIU communication electricity in the prior art Electromagnetism caused by when at high cost existing for the road, space constraints existing for being laid out on pcb board and chipset become second nature higher The poor problem of the performance of compatible and reliability etc..

Detailed description of the invention

Fig. 1 is the circuit diagram of the CIU communicating circuit in the utility model embodiment.

Specific embodiment

The utility model is described in further detail below in conjunction with figure embodiment.

As shown in Figure 1, a kind of CIU communicating circuit of meter, is set in meter, for passing through data sending terminal TXD sum number Control electricity is received according to receiving end RXD and CIU module communication, including signal sending controling circuit 1, communication interface circuit 2 and signal Road 3, the input terminal of data sending terminal TXD connection signal sending controling circuit 1, the output end connection of signal sending controling circuit 1 The communication interface circuit 2, one end of communication interface circuit 2 connect CIU module, and the other end of communication interface circuit 2 connects letter Number receive control circuit 3, and signal receive control circuit 3 output end connect data receiver RXD.

Wherein, signal sending controling circuit 1 includes the first triode V1, the second triode V2, third transistor V3, first Resistance R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, data sending terminal TXD One end of the 6th resistance R6 is connected, the other end of the 6th resistance R6 connects the base stage of third transistor V3, third transistor V3's Emitter ground connection, the collector of third transistor V3 connect one end of the 5th resistance R5, and the other end of the 5th resistance R5 connects respectively The collector of the first triode V1 and the base stage of the second triode V2 are connect, the base stage of the first triode V1 connects the two or three pole The emitter of pipe V2, one end of the emitter connection first resistor R1 of the first triode V1, the other end difference of first resistor R1 Connect one end of second resistance R2,3rd resistor R3 and the 4th resistance R4, and first resistor R1 and second resistance R2,3rd resistor Between R3 and the junction of the 4th resistance R4 connect first voltage VCC, second resistance R2,3rd resistor R3 and the 4th resistance R4 according to Secondary parallel connection, second resistance R2,3rd resistor R3 and the 4th resistance R4 other end interconnected are connected to the first triode V1's Between the connecting line of the emitter of base stage and the second triode V2, the current collection of the second triode V2 extremely signal sending controling circuit Output end.In the present embodiment, the first triode V1 is PNP pipe, and the second triode V2 is PNP pipe, and third transistor V3 is PNP Pipe, first voltage VCC are 18V.

Communication interface circuit 2 includes first diode D1, the second diode D2 and thirteenth resistor R13, the second triode The anode of the collector connection first diode D1 of V2, the cathode of first diode D1 connect the anode of the second diode D2, the One diode D1) cathode and the second diode D2 anode connecting line between be also connected with one end of thirteenth resistor R13, The other end of thirteenth resistor R13 is grounded, and the cathode and the second diode D2 of thirteenth resistor R13 and first diode D1 are just The junction of pole is interface end A, and communication interface circuit 2 is connected by interface end A with CIU module.

It includes the 4th triode V4, metal-oxide-semiconductor M1, the 7th resistance R7, the 8th resistance R8, the 9th that signal, which receives control circuit 3, Resistance R9, the tenth resistance R10, eleventh resistor R11 and twelfth resistor R12, the cathode of the second diode D2 are separately connected One end of nine resistance R9 and twelfth resistor R12, the other end ground connection of twelfth resistor R12, the other end point of the 9th resistance R9 Not Lian Jie one end of the 8th resistance R8 and the grid of metal-oxide-semiconductor M1, the other end of the 8th resistance R8 connects one end of the 7th resistance R7, The other end of 7th resistance R7 connects first voltage VCC, and the source electrode of metal-oxide-semiconductor M1 connects the company of the 7th resistance R7 and the 8th resistance R8 Between wiring, one end of the drain electrode connection eleventh resistor R11 of metal-oxide-semiconductor M1, the other end connection the four or three of eleventh resistor R11 The base stage of pole pipe V4, the emitter ground connection of the 4th triode V4, the collector of the 4th triode V4 connect the one of the tenth resistance R10 End, the other end of the tenth resistance R10 connect second voltage VSS, and data receiver RXD is connected to the electricity of the 4th triode V4 and the tenth Between the connecting line for hindering R10.In the present embodiment, metal-oxide-semiconductor M1 is PMOS tube, and the 4th triode V4 is NPN pipe.In the present embodiment, Second voltage VSS is 3.3V.

A kind of meter has above-mentioned CIU communicating circuit.In the present embodiment, meter is ammeter, water meter or gas meter, flow meter.

The CIU communicating circuit is connected with CIU module, when CIU communicating circuit and CIU module are in communication state When, data sending terminal TXD is in high level, and the base stage of diode V2 is grounded resistance R67 biasing at this time, and diode V2 is in full And on state, then the voltage at interface end A are as follows: first voltage 18V subtracts second resistance R2 both end voltage and the second triode The CE of V2 is tied, then obtains voltage interface end A at as 16.7V, at this time the base stage of the first triode V1 by pull-up resistor R2 in parallel, R3, R4 biasing, since the electric current that the collector of the second triode V2 flows through is smaller, generate on parallel resistance R2, R3, R4 Pressure drop it is smaller, the not up to cut-in voltage of the emitter of the first triode V1, and the base stage of the first triode V1 flows through Electric current is extremely small, therefore the first triode V1 is in off state；Then the negative pole end voltage of the second diode D2 is about at this time 16.1V, in the present embodiment, the 7th resistance R7 is 10K Ω, and the 8th resistance R8 is 4.7K Ω, and the 9th resistance R9 is 1K Ω, then at this time Flow through the electric current on the 8th resistance R8 are as follows: the grid and source electrode of (18-16.1)/(10K+4.7K+1K)=1.2mA, metal-oxide-semiconductor M1 it Between voltage be 0.56V, less than the conducting voltage of metal-oxide-semiconductor M1, therefore metal-oxide-semiconductor M1 is not turned on, and the 4th triode V4 be in cut Only state, then data receiver RXD is high level, when CIU communicating circuit is in communication state with CIU module, CIU communication Circuit plays the role of power supply, is CIU module for power supply.

When CIU communicating circuit and CIU module are in communication state, wherein before communication, CIU communicating circuit sends one A communication starts data frame and gives CIU module, and CIU module receives after the communication starts data frame, CIU module and CIU communication electricity Road is communicated；Likewise, CIU communication sends a communication end data frame and gives CIU module, CIU module at the end of communication After receiving the communication and terminating data frame, CIU module terminates to communicate with CIU communicating circuit, when terminating communication, CIU communicating circuit Play the role of power supply, is CIU module for power supply.Data mode is sent when CIU communicating circuit is in: when sending data " 1 ", data Transmitting terminal TXD is high level, and interface end A voltage is 16.7V, when sending data " 0 ", at this time due to the first triode V1 and the Two triode V2 are in off state, and interface end A voltage is to be pulled down resistance R13 to be pulled down to 0V；When CIU communicating circuit is in Receive data mode: when receiving data " 1 ", logical AND is identical with communication state, and data receiver RXD obtains high level, real Data " 1 " now is received, when receiving data " 0 ", accesses 400 Ω resistance, the transmitting of the second triode V2 over the ground out with interface end A The desired value of electrode current is 41mA, due to the biasing of parallel resistance R2, R3, R4, when the emitter current of the second triode V2 increases When greatly to 15mA, the first triode V1 is in saturation conduction state, by current-clamp in electric current in 15mA, then interface end A at this time Voltage is about 9.6V, and the negative pole end voltage of the second diode D2 is 9V, at this time grid of the pressure drop greater than metal-oxide-semiconductor M1 on the 8th resistance R8 Cut-in voltage between pole and source electrode, therefore metal-oxide-semiconductor M1 is connected, the 4th triode V4 conducting, then data receiver RXD is low electricity It is flat, therefore receive signal " 0 ".

Therefore CIU communicating circuit is formed by discrete component, reduced costs, and structure is simpler, in pcb board On layout it is more flexible, reduce the occupied space on pcb board, avoid integrated chip in Electro Magnetic Compatibility and reliability Aspect is easy the problem of by external interference；By the way that individual devices are arranged, therefore the influence between each component is smaller, reliability It is obviously improved with Electro Magnetic Compatibility, and when some component damage, can be individually replaced, replace more convenient.

The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without deviating from the technical principle of the utility model, several improvements and modifications can also be made, these change It also should be regarded as the protection scope of the utility model into retouching.

Claims

1. a kind of CIU communicating circuit of meter is set in meter, for passing through data sending terminal (TXD) and data receiver (RXD) with CIU module communication, it is characterised in that: connect including signal sending controling circuit (1), communication interface circuit (2) and signal It receives control circuit (3), the input terminal of data sending terminal (TXD) the connection signal sending controling circuit (1), the signal is sent The output end of control circuit (1) connects the communication interface circuit (2), and one end of the communication interface circuit (2) connects CIU mould The other end connection signal of block, the communication interface circuit (2) receives control circuit (3), and the signal receives control circuit (3) output end connects data receiver (RXD).

2. CIU communicating circuit according to claim 1, it is characterised in that: the signal sending controling circuit (1) includes the One triode (V1), the second triode (V2), third transistor (V3), first resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5) and the 6th resistance (R6), the data sending terminal (TXD) connect the 6th resistance (R6) one end, the base stage of other end connection third transistor (V3) of the 6th resistance (R6), the third transistor (V3) emitter ground connection, the collector of the third transistor (V3) connect one end of the 5th resistance (R5), the 5th electricity The other end of resistance (R5) is separately connected the collector of the first triode (V1) and the base stage of the second triode (V2), and the described 1st The base stage of pole pipe (V1) connects the emitter of second triode (V2), the emitter connection of first triode (V1) the One end of one resistance (R1), the other end of the first resistor (R1) be separately connected second resistance (R2), 3rd resistor (R3) and One end of 4th resistance (R4), and first resistor (R1) and second resistance (R2), 3rd resistor (R3) and the 4th resistance (R4) First voltage (VCC) is connected between junction, the second resistance (R2), 3rd resistor (R3) and the 4th resistance (R4) are successively simultaneously Connection, the second resistance (R2), 3rd resistor (R3) and the 4th resistance (R4) other end interconnected are connected to the one or three pole It manages between the base stage of (V1) and the connecting line of the emitter of the second triode (V2), the current collection of second triode (V2) is extremely The output end of signal sending controling circuit.

3. CIU communicating circuit according to claim 2, it is characterised in that: the communication interface circuit (2) includes the one or two Pole pipe (D1), the second diode (D2) and thirteenth resistor (R13), the collector connection the one or two of second triode (V2) The anode of pole pipe (D1), the anode of cathode connection second diode (D2) of the first diode (D1), described first The one of thirteenth resistor (R13) is also connected between the connecting line of the anode of the cathode and the second diode (D2) of diode (D1) End, the other end ground connection of the thirteenth resistor (R13), the cathode of the thirteenth resistor (R13) and first diode (D1) Junction with the anode of the second diode (D2) is interface end (A).

4. CIU communicating circuit according to claim 3, it is characterised in that: the communication interface circuit (2) passes through interface end (A) it is connected with CIU module.

5. CIU communicating circuit according to claim 3, it is characterised in that: it includes that the signal, which receives control circuit (3), Four triodes (V4), metal-oxide-semiconductor (M1), the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10), The cathode of eleventh resistor (R11) and twelfth resistor (R12), second diode (D2) is separately connected the 9th resistance (R9) With one end of twelfth resistor (R12), the other end of the twelfth resistor (R12) is grounded, the 9th resistance (R9) it is another One end is separately connected one end of the 8th resistance (R8) and the grid of metal-oxide-semiconductor (M1), the other end connection of the 8th resistance (R8) The other end of one end of the 7th resistance (R7), the 7th resistance (R7) connects first voltage (VCC), the metal-oxide-semiconductor (M1) Source electrode connects between the 7th resistance (R7) and the connecting line of the 8th resistance (R8), the drain electrode connection the 11st of the metal-oxide-semiconductor (M1) One end of resistance (R11), the base stage of the other end the 4th triode (V4) of connection of the eleventh resistor (R11), the described 4th The emitter of triode (V4) is grounded, and the collector of the 4th triode (V4) connects one end of the tenth resistance (R10), described The other end of tenth resistance (R10) connects second voltage (VSS), and the data receiver (RXD) is connected to the 4th triode (V4) between the connecting line of the tenth resistance (R10).

6. CIU communicating circuit according to claim 5, it is characterised in that: the metal-oxide-semiconductor (M1) is PMOS tube.

7. CIU communicating circuit according to claim 2, it is characterised in that: first triode (V1) is PNP pipe, institute Stating the second triode (V2) is PNP pipe, and the third transistor (V3) is PNP pipe.

8. CIU communicating circuit according to claim 5, it is characterised in that: the 4th triode (V4) is NPN pipe.

9. CIU communicating circuit according to claim 1, it is characterised in that: the meter is ammeter, water meter or gas meter, flow meter.

10. a kind of meter, it is characterised in that: have CIU communicating circuit according to any one of claims 1 to 9.