CN209513882U - A kind of telecommunication circuit of meter - Google Patents
A kind of telecommunication circuit of meter Download PDFInfo
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- CN209513882U CN209513882U CN201821661755.6U CN201821661755U CN209513882U CN 209513882 U CN209513882 U CN 209513882U CN 201821661755 U CN201821661755 U CN 201821661755U CN 209513882 U CN209513882 U CN 209513882U
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Abstract
A kind of telecommunication circuit of meter, including slave data transmitting line and slave data receiver circuit；The data sending terminal of the base stage connection slave of first triode in slave data transmitting line, the emitter of first triode connects the first power supply, the grounded collector of first triode, the collector that the base stage of second triode is connected to the first triode is connected to ground between line, the collector of second triode connects first resistor one end, the first resistor other end connects bus, the emitter ground connection of the second triode；One end of bus connection capacitor in slave data receiver circuit, the base stage of the other end connection third transistor of capacitor, bus and capacitor connection line indirectly, the emitter of third transistor connects the first power supply, the collector of third transistor connects the base stage of the 4th triode, the emitter of 4th triode is grounded, the data receiver of the collector connection slave of the 4th triode.Meet telecommunication demand, it is at low cost, communication reliability is high.
Description
Technical field
The utility model relates to data communication field, in particular to a kind of telecommunication circuit of meter.
Background technique
Prepayment meter is divided into according to electric energy meter structure: monoblock type electric energy meter and Split electric energy meter, wherein monoblock type
Electric energy meter is the kilowatt-hour meter that all components of composition electric energy meter are arranged in same watchcase, which is suitble to replace indoor peace
The various ammeters of dress；In addition, Split electric energy meter is that all components of composition electric energy meter do not reside at the electric degree in same watchcase
Table, the CIU (Customer Interface Unit) of Split electric energy meter is i.e. between user's display unit and meter by having
The various modes such as line, wireless, infrared or power carrier communicate, and user indoors can complete to look into ammeter electricity consumption data by CIU
The operations such as inquiry, the input of token code.
The overseas pre-payment meter in part has CIU demand in African country, because of customer demand, needs to design a electric current loop
CIU is carried out telecommunication with meter, and host is meter, slave CIU, the bus quiescent voltage model connected between host and slave
Enclose 14V~30V, representative value 20V；Quiescent dissipation Imark < 10mA in bus；When host quiescent voltage is representative value 20V,
The signal transmitted from host to slave uses sequence of voltage pulses, when sending logic 1 represents host transmission high level, i.e., to bus
Transmission+20V voltage, when sending logic 0 represents host transmission low level, i.e., to bus transmission+10V voltage, All hosts communication
When bus voltage dynamic change 7V~15V；The signal that slave is transmitted to host uses current pulse sequence, and sending logic 1 represents
When slave sends high level, i.e., Imark electric current is sent to bus, when sending logic 0 represents slave transmission low level, i.e., to bus
Imark+ (20~30) mA electric current is sent, bus current dynamic change (20~30mA) when slave communicates, and meeting practical need
In the case of asking, need to guarantee the communication reliability under its mal-condition there are enough allowances, and consider meter in practical application
The case where communication causes power consumption to become larger, causes host bus brownout.
CIU is received in circuit in the prior art, as shown in Figure 1, bus voltage keeps 20V when host sends high level
Constant, by ending triode V5 after a voltage-stabiliser tube VD1 pressure drop under 20V voltage, the data receiver RXD of CIU is high electricity
It is flat；When host sends low level, bus voltage is pulled low 10V, can not puncture voltage-stabiliser tube VD1, triode V5 saturation conduction,
The data receiver RXD of CIU is low.But there are a drawbacks for this circuit, when host power supply is 14V system, host under normality
High level is sent, bus level is about 2V after voltage-stabiliser tube VD1, and triode V5 conducting, the data receiver RXD of CIU is low
Level causes CIU to receive by mistake；When host power supply is 30V system, host sends low level, if bus voltage drags down 10V, always
Line level voltage after voltage-stabiliser tube VD1 is still greater than 3.3V, and triode V5 is caused to be not turned on, the data receiver RXD mono- of CIU
Directly it is in high level.Therefore it requires further improvement.
Utility model content
For the current state of the art, the technical problem to be solved by the utility model is to provide a kind of at low cost, communications
High reliablity and the telecommunication circuit for being applicable in the wide meter of voltage range.
Technical solution adopted by the utility model to solve the above technical problems is as follows: a kind of telecommunication circuit of meter,
For communicating between host and slave, the host is connected by bus with slave, it is characterised in that: is sent out including slave data
Power transmission road and slave data receiver circuit；
In the slave data transmitting line include first resistor, the first triode and the second triode, the described 1st
The data sending terminal of the base stage connection slave of pole pipe, emitter the first power supply of connection of first triode, the described 1st
The grounded collector of pole pipe, the collector that the base stage of second triode is connected to the first triode are connected to ground between line,
Collector connection first resistor one end of second triode, the first resistor other end connection bus, the described 2nd 3
The emitter of pole pipe is grounded；
It include capacitor, third transistor and the 4th triode, the bus connection electricity in the slave data receiver circuit
One end of appearance, the base stage of the other end connection third transistor of the capacitor, the bus and capacitor connection line indirectly, institute
The emitter for stating third transistor connects the first power supply, and the collector of the third transistor connects the base stage of the 4th triode,
The emitter of 4th triode is grounded, the data receiver of the collector connection slave of the 4th triode.
As an improvement, further include second resistance, 3rd resistor and the 4th resistance in the slave data transmitting line, it is described
Data sending terminal connects the base stage of the first triode by second resistance, and the collector of first triode passes through 3rd resistor
Connection ground, the base stage of second triode are connect by the collector that the 4th resistance is connected to the first triode with 3rd resistor
Between line.
Preferably, first triode is PNP pipe.
Preferably, second triode is NPN pipe.
It further, further include the 5th resistance, the 6th resistance and the 7th resistance in the slave data receiver circuit, it is described
One end of 5th resistance is connected between the bus and capacitor connection line, the other end of the 5th resistance ground connection, and described the
The collector of three triodes connects the base stage of the 4th triode by the 6th resistance, and one end of the 7th resistance is connected to third
Between the emitter of triode and the first electric power connection line, the other end of the 7th resistance connects the collection of the 4th triode
Electrode, the data receiver of the slave are connected between the 7th resistance and the collector connecting line of the 4th triode.
Preferably, the third transistor is PNP pipe.
Preferably, the 4th triode is NPN pipe.
Preferably, the host is meter.
Preferably, the slave is CIU display unit.
Compared with the prior art, the advantages of the utility model are: full by slave data receiver circuit and transmitting line
Demand in foot telecommunication, and can be realized the requirement in telecommunication to bus voltage, made using discrete circuit
For slave circuit, reduce costs；And the communication reliability of slave data receiver circuit is high, applicable voltage range is wide, can be applicable in
In the host system of different voltages.
Detailed description of the invention
Fig. 1 is the circuit diagram that slave receives circuit in the prior art；
Fig. 2 is slave data transmitting line figure in the utility model；
Fig. 3 is slave data receiver circuit figure in the utility model.
Specific embodiment
The utility model is described in further detail below in conjunction with figure embodiment.
A kind of telecommunication circuit of meter includes slave data transmitting line and slave data receiver circuit, is used for host
It is communicated between slave, host is connected by bus with slave.In the present embodiment, host is the meter of ammeter, and slave is
CIU display unit.
Wherein, as shown in Fig. 2, including first resistor R1, second resistance R2,3rd resistor in slave data transmitting line
The data sending terminal TXD of R3, the 4th resistance R4, the first triode V1 and the second triode V2, slave are connected by second resistance R2
The base stage of the first triode V1 is connect, the emitter of the first triode V1 connects the first power supply VCC, the collector of the first triode V1
By 3rd resistor R3 connection ground, the base stage of the second triode V2 is connected to the collection of the first triode V1 by the 4th resistance R4
Between electrode and 3rd resistor R3 connecting line, the emitter of the second triode V2 is grounded, and the collector of the second triode V2 passes through
First resistor R1 connection bus, wherein bus voltage is VSS in Fig. 2.In the present embodiment, the voltage of the first power supply VCC is
3.3V, bus quiescent voltage are 20V, and the first triode V1 is PNP pipe, and the second triode V2 is NPN pipe.
In addition, as shown in figure 3, including the 5th resistance R5, the 6th resistance R6 and the 7th resistance in slave data receiver circuit
R7, capacitor C1, third transistor V3 and the 4th triode V4, bus connect one end of capacitor C1, and one end of the 5th resistance R5 connects
It connecing between bus and capacitor C1 connecting line, wherein bus voltage is VSS in circuit diagram, and the other end of the 5th resistance R5 is grounded,
The base stage of the other end connection third transistor V3 of capacitor C1, the emitter of third transistor V3 connect the first power supply VCC, the
The collector of three triode V3 passes through the base stage of the 4th triode V4 of the 6th resistance R6 connection, and the emitter of the 4th triode V4 connects
Ground, one end of the 7th resistance R7 are connected between the emitter of third transistor V3 and the first power supply VCC connecting line, the 7th electricity
The other end for hindering R7 connects the collector of the 4th triode V4, and the data receiver RXD of slave is connected to the 7th resistance R7 and the
Between the collector connecting line of four triode V4.In the present embodiment, third transistor V3 is PNP pipe, and the 4th triode V4 is NPN
Pipe.
When slave sends data to host, when the data sending terminal TXD of slave sends high level, the first triode V1 is cut
Only, the second triode V2 ends, therefore no current passes through on first resistor R1, and the electric current in bus does not change, therefore host
It is received as high level；When the data sending terminal TXD of slave sends low level, the first triode V1 saturation conduction, the second triode
V2 conducting, therefore have electric current process on first resistor R1, the increased magnitude of current is in busCurent change is by table
Meter receives, and host ready to receive is low level.
When host sends data to slave, when host sends high level, bus voltage is constant, and capacitor C1 is equivalent to disconnected
Road, third transistor V3 cut-off, the base stage no current of the 4th triode V4, therefore the 4th triode V4 ends, thus slave
Data receiver RXD is high level；When host sends low level, if bus voltage falls to 10V (20V system), because of capacitor
C1 both end voltage cannot be mutated, and capacitor C1 right end voltage is reduced to -6.7V by 3.3V, and third transistor V3 amplification is connected, and the four or three
Pole pipe V4 base stage flows through electric current, the 4th triode V4 saturation conduction, so that the data receiver RXD of slave is low level.
It is all in low level situation (2400bps) when host sends 100 bytes, total duration is about 400ms, works as electricity
When appearance C1 right end reaches the voltage 2.6V of third transistor V3 base stage because of charge circuit, third transistor V3 is not turned on, then is communicated
Failure, as long as so guaranteeing that capacitor right end voltage is ensured that lower than the voltage 2.6V of third transistor V3 base stage in 400ms
Communication reliability, therefore communication reliability is high, remains to stablize communication under extreme case.
And when host power supply is 14V system, bus voltage 14V, host sends high level, capacitor C1 under normality
It is equivalent to open circuit, third transistor V3 cut-off, the base stage no current of the 4th triode V4, therefore the 4th triode V4 ends, from
And the data receiver RXD of slave is high level；When host power supply is 30V system, bus voltage 30V, host sends low
Level falls to 20V if bus voltage drags down 10V, because capacitor C1 both end voltage cannot be mutated, capacitor C1 right end voltage by
3.3V is reduced to -16.7V, third transistor V3 amplification conducting, and the 4th triode V4 base stage flows through electric current, the 4th triode V4 saturation
Conducting, so that the data receiver RXD of slave is low level.Therefore the data transmitting line of the slave and data receiver circuit are suitable
Voltage range is wider, can be applicable in for the host system of different voltages.
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 (9)
1. a kind of telecommunication circuit of meter, for communicating between host and slave, the host passes through bus and slave phase
Connection, it is characterised in that: including slave data transmitting line and slave data receiver circuit；
It include first resistor (R1), the first triode (V1) and the second triode (V2), institute in the slave data transmitting line
The data sending terminal (TXD) of the base stage connection slave of the first triode (V1) is stated, the emitter of first triode (V1) connects
It connects the first power supply (VCC), the base stage of the grounded collector of first triode (V1), second triode (V2) is connected to
The collector of first triode (V1) is connected to ground between line, and the collector of second triode (V2) connects first resistor
(R1) one end, first resistor (R1) other end connect bus, the emitter ground connection of second triode (V2)；
It is described total including capacitor (C1), third transistor (V3) and the 4th triode (V4) in the slave data receiver circuit
Line connect capacitor (C1) one end, the capacitor (C1) the other end connection third transistor (V3) base stage, the bus with
Capacitor (C1) connecting line indirectly, the emitter of the third transistor (V3) connects the first power supply (VCC), the described 3rd 3
The collector of pole pipe (V3) connects the base stage of the 4th triode (V4), and the emitter ground connection of the 4th triode (V4) is described
The data receiver (RXD) of the collector connection slave of 4th triode (V4).
2. the telecommunication circuit of meter according to claim 1, it is characterised in that: in the slave data transmitting line
It further include second resistance (R2), 3rd resistor (R3) and the 4th resistance (R4), the data sending terminal (TXD) passes through second resistance
(R2) base stage of the first triode (V1) is connected, the collector of first triode (V1) is connected by 3rd resistor (R3)
Ground, the base stage of second triode (V2) are connected to the collector and third of the first triode (V1) by the 4th resistance (R4)
Between resistance (R3) connecting line.
3. the telecommunication circuit of described in any item meters according to claim 1~2, it is characterised in that: the one or three pole
Managing (V1) is PNP pipe.
4. the telecommunication circuit of described in any item meters according to claim 1~2, it is characterised in that: the two or three pole
(V2) is managed as NPN pipe.
5. the telecommunication circuit of meter according to claim 1, it is characterised in that: in the slave data receiver circuit
It further include the 5th resistance (R5), the 6th resistance (R6) and the 7th resistance (R7), one end of the 5th resistance (R5) is connected to institute
It states between bus and capacitor (C1) connecting line, the other end ground connection of the 5th resistance (R5), the third transistor (V3)
Collector connects the base stage of the 4th triode (V4) by the 6th resistance (R6), and one end of the 7th resistance (R7) is connected to the
Between the emitter and the first power supply (VCC) connecting line of three triodes (V3), the other end of the 7th resistance (R7) connects institute
The collector of the 4th triode (V4) is stated, the data receiver (RXD) of the slave is connected to the 7th resistance (R7) and the four or three
Between the collector connecting line of pole pipe (V4).
6. according to claim 1 or the telecommunication circuit of 5 described in any item meters, it is characterised in that: the three or three pole
Managing (V3) is PNP pipe.
7. according to claim 1 or the telecommunication circuit of 5 described in any item meters, it is characterised in that: the four or three pole
(V4) is managed as NPN pipe.
8. the telecommunication circuit of meter according to claim 1, it is characterised in that: the host is meter.
9. the telecommunication circuit of meter according to claim 1, it is characterised in that: the slave is CIU display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821661755.6U CN209513882U (en) | 2018-10-12 | 2018-10-12 | A kind of telecommunication circuit of meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821661755.6U CN209513882U (en) | 2018-10-12 | 2018-10-12 | A kind of telecommunication circuit of meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209513882U true CN209513882U (en) | 2019-10-18 |
Family
ID=68192396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821661755.6U Active CN209513882U (en) | 2018-10-12 | 2018-10-12 | A kind of telecommunication circuit of meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209513882U (en) |
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2018
- 2018-10-12 CN CN201821661755.6U patent/CN209513882U/en active Active
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