CN212752520U - Mbus sending circuit of intelligent water meter and intelligent water meter system - Google Patents
Mbus sending circuit of intelligent water meter and intelligent water meter system Download PDFInfo
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- CN212752520U CN212752520U CN202021543309.2U CN202021543309U CN212752520U CN 212752520 U CN212752520 U CN 212752520U CN 202021543309 U CN202021543309 U CN 202021543309U CN 212752520 U CN212752520 U CN 212752520U
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Abstract
The utility model provides a Mbus sending circuit and intelligent water gauge system of intelligence water gauge, Mbus sending circuit includes protection unit, rectifier unit and amplification unit, and the amplification unit includes first triode and second triode, and the base of second triode is connected to microcontroller, and the collecting electrode of second triode is connected to the base of first triode, and the projecting pole of second triode is connected to first level; the collector of the first triode is connected with a second level, the second level is also connected to the input end of the rectifying unit, the output end of the rectifying unit is connected to the Mbus, and the microcontroller generates a current source oscillation signal and outputs the current source oscillation signal to the Mbus by controlling a level signal of the base of the second triode, so that the communication speed is improved, the number of components is reduced, and the cost is reduced.
Description
Technical Field
The utility model relates to a water gauge communication technology field, more specifically say, relate to a Mbus sending circuit and intelligent water gauge system of intelligence water gauge.
Background
At present, remote meter reading technologies are classified into two major types, namely wireless meter reading and wired meter reading. Among them, the wired meter reading communication technology commonly uses RS485 bus technology and Mbus bus technology. The RS485 bus technology needs to provide power for equipment, has more wiring, is more complex in field construction and has limited loading capacity; mbus is a two-wire bus of European standard, and is mainly used for consumption measuring instruments such as heat meters and water meter series, the water meter can obtain power supply through the bus, the water meter is powered only when the meter is read, and the bus is not electrified when the meter is idle, so that the energy consumption is greatly saved; because the two-wire system is adopted, the construction is simple and convenient, the loading capacity is strong, the communication distance is long, and the fluctuation of the power grid voltage is adaptable.
The conventional Mbus communication circuit of the remote transmission intelligent water meter is low in general speed and poor in signal transmission capability. In addition, because more devices are adopted, the production cost is higher, and troubles are brought to later maintenance and repair.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a to foretell intelligent water gauge Mbus communication circuit general speed low, signal transmission ability is poor, the higher problem of production, maintenance cost provides an Mbus sending circuit and intelligent water gauge system of intelligent water gauge.
The technical solution to solve the above technical problem of the present invention is to provide an Mbus transmission circuit of an intelligent water meter, wherein an input terminal of the Mbus transmission circuit is connected to a microcontroller, and an output terminal of the Mbus transmission circuit is connected to an Mbus master station through an Mbus bus; the Mbus sending circuit comprises a protection unit, a rectifying unit and an amplifying unit; the amplifying unit comprises a first triode and a second triode; the base electrode of the second triode is connected to the microcontroller, the collector electrode of the second triode is connected to the base electrode of the first triode, and the emitter electrode of the second triode is connected to a first level; the collector of the first triode is connected with a second level, the second level is also connected to the input end of the rectifying unit, the output end of the rectifying unit is connected to the Mbus, and the protection unit is connected between the Mbus in parallel; and the microcontroller generates a current source oscillation signal by controlling a level signal of a base electrode of the second triode and outputs the current source oscillation signal to the Mbus.
Preferably, the second level is a bus voltage of the Mbus.
Preferably, the first triode is an NPN-type triode, and the second triode is a PNP-type triode.
Preferably, the amplifying unit further includes a first resistor, a second resistor, a third resistor, and a fourth resistor; the base electrode of the second triode is connected to the signal sending end of the microcontroller through the second resistor, and the signal sending end of the microcontroller is also connected with the first level through the first resistor; the collector of the second triode is grounded through the fourth resistor; the emitter of the first triode is grounded through the third resistor.
Preferably, the first level is + 5V.
Preferably, the protection unit includes a transient voltage suppression diode.
Preferably, the rectifying unit includes a rectifying bridge.
The embodiment of the utility model provides an intelligence water gauge system is still provided, a serial communication port, including Mbus main website, microcontroller, and as above Mbus transmitting circuit, Mbus transmitting circuit's input is connected microcontroller, Mbus transmitting circuit's output passes through the Mbus bus connection the Mbus main website.
Implement the utility model discloses Mbus sending circuit and intelligent water gauge system of intelligence water gauge have following beneficial effect: the Mbus sending circuit comprises a protection unit, a rectifying unit and an amplifying unit, wherein the amplifying unit comprises a first triode and a second triode, the base electrode of the second triode is connected to the microcontroller, the collector electrode of the second triode is connected to the base electrode of the first triode, and the emitter electrode of the second triode is connected to a first level; the collector of the first triode is connected with a second level, the second level is also connected to the input end of the rectifying unit, the output end of the rectifying unit is connected to the Mbus, and the microcontroller generates a current source oscillation signal and outputs the current source oscillation signal to the Mbus by controlling a level signal of the base of the second triode, so that the communication speed is improved, the number of components is reduced, and the cost is reduced.
Drawings
Fig. 1 is a block diagram of an intelligent water meter system provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of an Mbus sending circuit of an intelligent water meter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the block diagram of the intelligent water meter system provided by the embodiment of the present invention includes an Mbus transmission circuit, an MCU (Microcontroller Unit)104, and an Mbus master station 105. The input terminal of the Mbus transmission circuit is connected to the MCU 104, and the output terminal of the Mbus transmission circuit is connected to the Mbus master station 105 via an Mbus. Specifically, the Mbus transmission circuit includes a protection unit 101, a rectification unit 102, and an amplification unit 103.
With reference to fig. 2, it is a schematic diagram of the Mbus sending circuit of the intelligent water meter according to an embodiment of the present invention, wherein the amplifying unit 103 includes a first transistor Q1 and a second transistor Q2, a base of the second transistor Q2 is connected to the MCU 105, a collector of the second transistor Q2 is connected to a base of the first transistor Q1, and an emitter of the second transistor Q1 is connected to the first level signal; the collector of the first triode Q1 is connected to the second level signal, and the second level signal is also connected to the input of the rectifying unit 102, the output of the rectifying unit 102 is connected to the Mbus bus, and the protection unit 101 is connected in parallel between the two bus lines (Mbus1, Mbus2) of the Mbus. The microcontroller 104 generates a current source oscillation signal by controlling a level signal of the base of the second transistor Q2 and outputs the current source oscillation signal to the Mbus bus, thereby improving the communication rate, reducing the number of components, and reducing the cost.
Wherein the second level signal is a bus voltage of said Mbus, and the first level is + 5V.
Specifically, in the embodiment of the present invention, the protection unit 101 is a Transient Voltage suppression diode (TVS), and when two poles of the TVS diode are impacted by high energy of reverse Transient, the high impedance between the two poles changes to low impedance, so that the Voltage between the two poles is clamped at a predetermined value, thereby effectively protecting the Mbus device from being damaged by the surge pulse.
Specifically, the rectifying unit 102 includes a rectifying bridge U1, the rectifying bridge U1 may be a rectifying chip, or may be formed by two pairs of four diodes in a butt joint, an input end of the rectifying bridge U1 is connected to the bus voltage of the Mbus, and two output ports of the rectifying bridge U1 are respectively connected to two Mbus buses.
In the embodiment of the present invention, the first transistor Q1 is an NPN transistor, and the second transistor Q2 is a PNP transistor.
In addition, the amplifying unit 103 further includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4; the base of the second transistor Q2 is connected to the transmitting signal terminal TXD of the MCU 104 via a second resistor R2, and the transmitting signal terminal TXD of the MCU 104 is also connected to the +5V via a first resistor R1. The collector of the second transistor Q2 is coupled to ground via a fourth resistor Q4, and the emitter of the first transistor Q1 is coupled to ground via a third resistor Q3.
The utility model discloses a level signal of microcontroller 104 control second triode Q2's base produces the current source oscillation signal and exports to the Mbus.
Specifically, when TXD is low, the MCU 104 transmits data, and since the second transistor Q2 is a PNP transistor, the second transistor Q2 is turned on when its controlled terminal is low. At this time, the controlled terminal of the first triode Q1 is at a high level, and since the first triode Q1 is an NPN type triode, when the controlled terminal is at a high level, the first triode Q1 is turned on, the bus voltage VCC of the Mbus passes through the triode Q1 and the resistor R3 to form an instantaneous current, and after rectification and TVS protection by the rectifier bridge, the instantaneous current is output to the Mbus bus Mbus1 and the Mbus 2.
When TXD is high, since the second transistor Q2 is a PNP transistor, the second transistor Q2 is turned off when its controlled terminal is high. At this time, the controlled terminal of the first transistor Q1 is at a low level, and since the first transistor Q1 is an NPN transistor, the first transistor Q1 is turned off when the controlled terminal thereof is at a low level, so that the currents output to the Mbus bus Mbus1 and Mbus2 are maintained stable.
The embodiment of the utility model provides a still provide an intelligent water gauge system, this water gauge can be photoelectric direct reading water gauge, and this intelligent water gauge system includes Mbus main website 105, microcontroller 104, and as above Mbus transmitting circuit, microcontroller 104 is connected to Mbus transmitting circuit's input, Mbus main website 105 is passed through to Mbus transmitting circuit's output. The microcontroller 104 generates a current source oscillation signal via the Mbus transmission circuit by controlling a level signal of the transmission signal terminal TXD and outputs the current source oscillation signal to the Mbus bus, thereby improving the communication rate, reducing the number of components, and reducing the cost.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An input end of the Mbus sending circuit is connected with a microcontroller, and an output end of the Mbus sending circuit is connected with an Mbus master station through an Mbus; the Mbus sending circuit is characterized by comprising a protection unit, a rectifying unit and an amplifying unit;
the amplifying unit comprises a first triode and a second triode;
the base electrode of the second triode is connected to the microcontroller, the collector electrode of the second triode is connected to the base electrode of the first triode, and the emitter electrode of the second triode is connected to a first level;
the collector of the first triode is connected with a second level, the second level is also connected to the input end of the rectifying unit, the output end of the rectifying unit is connected to the Mbus, and the protection unit is connected between the Mbus in parallel;
and the microcontroller generates a current source oscillation signal by controlling a level signal of a base electrode of the second triode and outputs the current source oscillation signal to the Mbus.
2. The Mbus transmission circuit of an intelligent water meter as set forth in claim 1, wherein the second level is a bus voltage of the Mbus.
3. The Mbus routing circuit of an intelligent water meter of claim 1, wherein the first transistor is an NPN transistor and the second transistor is a PNP transistor.
4. The Mbus sending circuit of an intelligent water meter as set forth in claim 1, wherein the amplification unit further comprises a first resistor, a second resistor, a third resistor, and a fourth resistor;
the base electrode of the second triode is connected to the signal sending end of the microcontroller through the second resistor, and the signal sending end of the microcontroller is also connected with the first level through the first resistor;
the collector of the second triode is grounded through the fourth resistor;
the emitter of the first triode is grounded through the third resistor.
5. The Mbus sending circuit of the intelligent water meter of claim 4, wherein the first level is + 5V.
6. The Mbus routing circuit of an intelligent water meter as set forth in claim 1, wherein the protection unit includes a transient voltage suppression diode.
7. The Mbus routing circuit of an intelligent water meter as set forth in claim 1, wherein the rectifying unit comprises a rectifier bridge.
8. An intelligent water meter system, comprising an Mbus master station, a microcontroller, and an Mbus transmission circuit as claimed in any one of claims 1-7, an input of the Mbus transmission circuit coupled to the microcontroller, and an output of the Mbus transmission circuit coupled to the Mbus master station via the Mbus bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021543309.2U CN212752520U (en) | 2020-07-29 | 2020-07-29 | Mbus sending circuit of intelligent water meter and intelligent water meter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021543309.2U CN212752520U (en) | 2020-07-29 | 2020-07-29 | Mbus sending circuit of intelligent water meter and intelligent water meter system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212752520U true CN212752520U (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021543309.2U Active CN212752520U (en) | 2020-07-29 | 2020-07-29 | Mbus sending circuit of intelligent water meter and intelligent water meter system |
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| Country | Link |
|---|---|
| CN (1) | CN212752520U (en) |
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2020
- 2020-07-29 CN CN202021543309.2U patent/CN212752520U/en active Active
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