CN109360404B - Multichannel intelligent meter reading remote transmission device and method for M-Bus master station - Google Patents
Multichannel intelligent meter reading remote transmission device and method for M-Bus master station Download PDFInfo
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Abstract
The invention provides an M-Bus master station multichannel intelligent meter reading remote transmission device and a remote transmission method, wherein the device comprises the following steps: the meter reading request signal output end of the meter reading platform/local meter reading control module is connected with the meter reading request signal input end of the CPU; the CPU controls the input end of the switch control signal connected with each intelligent channel; the meter reading control signal output end of the CPU is connected with the meter reading control signal input end of the 13/36V meter reading signal modulation module; the Mbus-modulation signal output end of the 13/36V meter reading signal modulation module is connected with the Mbus-modulation signal input end of the intelligent channel; the meter receiving end of the intelligent channel is simultaneously connected with a plurality of meters; the Mbus+ modulation signal output ends of the intelligent channels are commonly connected with the Mbus+ modulation signal input ends of the double operational amplifier differential data acquisition demodulation analog-to-digital conversion module; the dual operational amplifier differential data acquisition demodulation analog-to-digital conversion module outputs signals to the data input end of the CPU.
Description
Technical Field
The invention belongs to the technical field of intelligent meter reading, and particularly relates to a multichannel intelligent meter reading remote transmission device and method for an M-Bus master station.
Background
At present, intelligent terminals of water, electricity, gas and heat meters are continuously developed, and a plurality of data transmission modes are continuously appeared:
the traditional TTL meter reading technology needs a power line, cannot realize remote transmission, is easy to be interfered by a field environment, causes the situation of dislocation of data during communication transmission, has high construction cost, is difficult to maintain, and has high failure rate;
the meter reading technology of the RS485 communication mode also needs a power line, uses 4 lines for communication, so that the use cost and the fault rate are greatly improved, the carrying capacity is weak, and the use cost is greatly increased;
the M-Bus technology is two-wire, not only can meet the requirement of remote transmission, but also can meet the requirement of remote power supply, and the use cost and the fault rate are greatly reduced, but the current M-Bus data acquisition technology adopts a single-ended current modulation technology, so that the anti-interference capability on the field complex environment is obviously insufficient, the meter reading is unstable, and the development of the technology in the meter reading field is also limited.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the M-Bus master station multichannel intelligent meter reading remote transmission device which can meet the requirements of remote transmission and remote power supply and has more stable and reliable field data acquisition.
An M-Bus master station multichannel intelligent meter reading remote transmission device, comprising: the meter reading platform/local meter reading control module, the CPU, the 13/36V meter reading signal modulation module, the double operational amplifier differential data acquisition and demodulation analog-to-digital conversion module and the plurality of intelligent channel modules, wherein the meter receiving end of each intelligent channel is connected with a plurality of meters; the meter reading request signal output end of the meter reading platform/local meter reading control module is connected with the meter reading request signal input end of the CPU; the switch control ends of all intelligent channels of the CPU are correspondingly connected with the switch control signal input ends of the corresponding intelligent channels one by one; the meter reading control signal output end of the CPU is connected with the meter reading control signal input end of the 13/36V meter reading signal modulation module, and the address signal output end to be meter-read of the CPU is connected with the address signal input end to be meter-read of the 13/36V meter reading signal modulation module; the Mbus-modulation signal output end of the 13/36V meter reading signal modulation module is simultaneously connected with the Mbus-modulation signal input end of each intelligent channel; the bus output end of each intelligent channel is simultaneously connected with the bus input ends of the corresponding multiple tables, and the bus output end of each table is commonly connected with the bus input end of the corresponding intelligent channel; the Mbus+ modulation signal output ends of the intelligent channels are commonly connected with the Mbus+ modulation signal input ends of the double operational amplifier differential data acquisition demodulation analog-to-digital conversion module; the collected data differential amplification signal output end of the double operational amplifier differential data collection demodulation analog-to-digital conversion module is connected with the collected data signal input end of the CPU; the collected data signal output end of the CPU is connected with the collected data signal input end of the meter reading platform/local meter reading control module.
The M-Bus master station multichannel intelligent meter reading remote transmission device comprises: the 13/36V meter reading signal modulation module comprises a 36V power supply chip and is used for providing a 36V stabilized voltage power supply; the 13/36V meter reading signal modulation module further comprises an MBUS-modulation signal output circuit: the first end of the seventh resistor is connected with the address signal output end to be read of the CPU, the second end of the seventh resistor is connected with the base electrode of the second NPN transistor, and the middle joint of the second end of the seventh resistor and the base electrode of the second NPN transistor is grounded through the ninth resistor; the emitter of the second NPN transistor is grounded, the collector of the second NPN transistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the grid of the first MOS transistor, the drain electrode of the first MOS transistor is connected with a 36V power supply, the 36V power supply is provided by a power supply chip U4, the first diode and the fifth resistor form a first parallel circuit, the first parallel circuit is connected between the 36V power supply and the second end of the fourth resistor, the positive electrode of the first diode is connected with the second end of the fourth resistor, the first parallel circuit is also connected between the drain electrode of the first MOS transistor and the grid of the first MOS transistor, the positive electrode of the first diode is connected with the grid of the first MOS transistor, the source electrode of the first MOS transistor is connected with the positive electrode of the fourth diode, the negative electrode of the fourth diode is connected with the drain electrode of the second MOS transistor, a second parallel circuit is also connected between the drain electrode of the second MOS transistor and the grid of the second MOS transistor, and the second parallel circuit is formed by the fifth diode and the thirteenth resistor in parallel connection; the positive electrode of the fourth diode is also connected with a 13V power supply through a third diode and a second diode; the source electrode of the second MOS tube is used for outputting an Mbus-modulated signal to the Mbus-modulated signal input end of the intelligent channel; the grid electrode of the second MOS tube is connected with the collector electrode of the ninth transistor through a nineteenth resistor, the emitter electrode of the ninth transistor is grounded, the base electrode of the ninth transistor is connected with the collector electrode of the eighth transistor through a twenty-seventh resistor, the collector electrode of the eighth transistor is also connected with a CVCC1 power supply through a fifteenth resistor, the emitter electrode of the eighth transistor is grounded, the base electrode of the eighth transistor is connected with the collector electrode of the seventh transistor, the collector electrode of the seventh transistor is also connected with a 3.3V power supply through a sixteenth resistor, the emitter electrode of the seventh transistor is grounded, and the base electrode of the seventh transistor is connected with a meter reading control signal output pin of the CPU through a twenty-fourth resistor.
The M-Bus master station multichannel intelligent meter reading remote transmission device comprises: in the intelligent channel module: the first end of the sixty-ninth resistor is used for being connected with a corresponding intelligent channel switch control pin of the CPU, the second end of the sixty-ninth resistor is connected with an input side cathode of the third photoelectric coupler, an input side anode of the third photoelectric coupler is connected with a 3.3V power supply through the sixty-first resistor, an output side collector of the third photoelectric coupler is connected with a CVCC1 power supply through the sixty-third resistor, an output side emitter of the third photoelectric coupler is connected with a base electrode of a sixteenth third transistor through the seventy-ninth resistor, a collector electrode of the sixteenth third transistor is connected with a 10 th pin of a control end of the third signal relay, and an emitter electrode of the sixteenth third transistor is grounded; the 1 st pin of the third signal relay is connected with a C13V power supply, and the 3 rd pin of the third signal relay is used for connecting with a source electrode of a second MOS tube in the 13/36V meter reading signal modulation module and receiving an Mbus-modulation signal transmitted by the 13/36V meter reading signal modulation module; the 4 th pin of the third signal relay is connected with the first end of the issuing bus M2-through an eleventh inductance magnetic bead, and the second end of the issuing bus M2-is simultaneously connected with all the issuing address signal input ends to be checked; all uploading signal output ends to be checked are connected with the second end of a tenth inductance magnetic bead through an uploading bus M2+, the first end of the tenth inductance magnetic bead is connected with the 7 th pin of a third signal relay K3, the 8 th pin of the third signal relay K3 is used for outputting an Mbus+ modulation signal containing a current data signal to be checked and a current address signal to be checked, and the 8 th pin of the third signal relay K3 is used for being connected with the Mbus+ modulation signal input end of the double operational amplifier differential data acquisition demodulation analog-digital conversion module.
The M-Bus master station multichannel intelligent meter reading remote transmission device comprises: in the dual-op-amp differential data acquisition demodulation analog-to-digital conversion module, an Mbus+ modulation signal input pin of the dual-op-amp differential data acquisition demodulation analog-to-digital conversion module is simultaneously connected with two paths of signal transmission circuits:
the first path is connected with the first end of the twenty-third capacitor, and the second path is connected with the first end of the forty-seventh resistor;
the first path is as follows: the second end of the twenty-third capacitor is connected with a forty-third resistor in series and then grounded, and the twenty-third capacitor and the forty-third resistor form a first band-pass filter;
the second end of the twenty-third capacitor is connected with the first end of the twenty-first capacitor, the second end of the twenty-first capacitor is connected with the forty-second resistor in series and then grounded, and the twenty-first capacitor and the forty-second resistor form a second band-pass filter;
the second end of the twenty-first capacitor is connected in series with a forty-first resistor and then connected with the negative electrode of the input end of the first operational amplifier; a thirty-ninth feedback resistor is connected between the negative electrode of the input end and the output end of the first operational amplifier;
the second path: the second end of the forty-seventh resistor is connected with the fifty-first resistor and then grounded, and the second end of the forty-seventh resistor is also connected with the first end of the twenty-fourth capacitor;
the second end of the twenty-fourth capacitor is connected with the fifty-sixth resistor in series and then grounded, and the twenty-fourth capacitor and the fifty-sixth resistor form a third band-pass filter;
the second end of the twenty-fourth capacitor is also connected with the first end of the twenty-fifth capacitor, the second end of the twenty-fifth capacitor is connected with the fifty-fourth resistor in series and then grounded, and the twenty-fifth capacitor and the fifty-fourth resistor form a fourth band-pass filter;
the second end of the twenty-fifth capacitor is connected with the anode of the input end of the first operational amplifier after being connected with the fifty-fifth resistor in series, and the anode of the input end of the first operational amplifier is also connected with the ground after being connected with the fifty-fifth resistor in series;
the output end of the first operational amplifier is connected in series with a thirty-seventh resistor and then is connected with the negative electrode of the input end of the second operational amplifier, a thirty-eighth feedback resistor is connected between the negative electrode of the input end of the second operational amplifier and the output end, the positive electrode of the input end of the second operational amplifier is grounded, and the output end of the second operational amplifier is used for being connected with the input end of the acquisition data signal of the CPU.
The M-Bus master station multichannel intelligent meter reading remote transmission device comprises: the CPU adopts an Atemel processor.
A multi-channel intelligent meter reading and remote meter reading method of an M-Bus master station comprises the following steps: 1) The CPU judges whether the meter reading request signal input end of the meter reading platform/the meter reading request signal output end of the local meter reading control module transmits meter reading request signals; then, enter step 2);
2) The CPU reads all address information to be read pre-stored in a storage device of the CPU, judges and calls the address information to be read currently, and aiming at the address information to be read currently, the corresponding intelligent channel switch control end of the CPU outputs a switch control signal, and transmits the switch control signal to the switch control signal input end of the corresponding intelligent channel to control the intelligent channel to be opened; then, enter step 3);
3) The meter reading control signal output end of the CPU outputs a current meter reading control signal to be read to the meter reading control signal input end of the 13/36V meter reading signal modulation module, and the meter reading address signal output end of the CPU outputs a current address signal to be read to the meter reading address signal input end of the 13/36V meter reading signal modulation module; after that, step 4) is entered;
4) The CPU receives the current data signal to be read from the data signal input end of the dual operational amplifier differential data acquisition and demodulation analog-to-digital conversion module, and stores the current data signal to be read from the data signal input end, and judges whether the received address signal of the meter in the current data signal to be read from the data signal to be read is the last address signal to be read from the meter according to the meter reading sequence, if not, the step 2) is entered, if yes, the step 5) is entered;
5) And the CPU transmits the data signals of all the meters to the collected data signal input end of the meter reading platform/local meter reading control module through the collected data signal output end.
The M-Bus master station multichannel intelligent meter reading and remote meter reading method comprises the following steps: and after the Mbus-modulated signals output by the Mbus-modulated signal output end of the 13/36V meter reading signal modulation module are output to the Mbus-modulated signal input end of the intelligent channel, the Mbus-modulated signals are transmitted to a plurality of bus input ends to be meter-read correspondingly through the bus output end M2-of the intelligent channel, if the address information in each Mbus-modulated signal to be meter-read corresponds to the address information, the meter outputs the data signals of the meter to the bus input end M2+ of the intelligent channel through the bus output end of the meter, and then the data signals of the meter are transmitted to the Mbus+ modulated signal input end of the double operational amplifier differential data acquisition demodulation analog-digital conversion module through the Mbus+ modulated signal output end of the intelligent channel, and then the double operational amplifier differential data acquisition demodulation analog-digital conversion module processes the data.
The M-Bus master station multichannel intelligent meter reading and remote meter reading method comprises the following steps: the method comprises the steps that a to-be-meter-read address signal output end of a CPU outputs a current to-be-meter-read address signal to a meter-read control signal input end of a 13/36V meter-read signal modulation module each time, an Mbus-modulation signal output end of the 13/36V meter-read signal modulation module correspondingly outputs an Mbus-modulation signal containing current to-be-meter-read address information, and the Mbus-modulation signal is transmitted to an Mbus-modulation signal input end of an intelligent channel;
then, uploading the data signal of the meter to be read corresponding to the address information in the Mbus-modulated signal to an intelligent channel through a bus, and transmitting the address information of the read meter and the data signal of the meter to an Mbus+ modulated signal input end of a double operational amplifier differential data acquisition demodulation analog-to-digital conversion module by an Mbus+ modulated signal output end of the intelligent channel;
and the CPU sends and receives the data signals until all the data signals to be read are read.
The M-Bus master station multichannel intelligent meter reading remote transmission device and method can remotely transmit collected data and remotely supply power, and can also increase the adaptability of field environment and meter reading stability through the signal modulation of the 13/36V meter reading signal modulation module, the double operational amplifier differential demodulation analog-digital conversion technology of the double operational amplifier differential data collection demodulation analog-digital conversion module and the intelligent channel module of the meter reading end, thereby meeting the meter reading requirements of high requirements on the stability of the collected data and the running reliability of equipment at present.
Drawings
FIG. 1 is a block diagram of a multi-channel intelligent meter reading remote transmission device of an M-Bus master station;
FIG. 2 is a schematic diagram of circuit pins of a CPU;
FIG. 3 is a schematic circuit diagram of a 13/36V meter reading signal modulation module;
FIG. 4 is a schematic circuit diagram of a dual op-amp differential data acquisition demodulation analog-to-digital conversion module;
fig. 5 is a schematic circuit diagram of the smart channel module.
Detailed Description
The invention provides an M-Bus master station multichannel intelligent meter reading remote transmission device, which is shown in figure 1 and comprises the following components:
the meter reading platform/local meter reading control module, the CPU, the 13/36V meter reading signal modulation module, the double operational amplifier differential data acquisition and demodulation analog-to-digital conversion module and the plurality of intelligent channel modules, wherein the meter receiving end of each intelligent channel is connected with a plurality of meters;
the meter reading request signal output end of the meter reading platform/local meter reading control module is connected with the meter reading request signal input end of the CPU;
the switch control ends of all intelligent channels of the CPU are correspondingly connected with the switch control signal input ends of the corresponding intelligent channels one by one;
the meter reading control signal output end of the CPU is connected with the meter reading control signal input end of the 13/36V meter reading signal modulation module, and the address signal output end to be meter-read of the CPU is connected with the address signal input end to be meter-read of the 13/36V meter reading signal modulation module;
the Mbus-modulation signal output end of the 13/36V meter reading signal modulation module is connected with the Mbus-modulation signal input end of the intelligent channel;
the bus output end of the intelligent channel is simultaneously connected with the bus input ends of a plurality of tables, and the bus output end of each table is commonly connected with the bus input end of the intelligent channel;
the Mbus+ modulation signal output ends of the intelligent channels are commonly connected with the Mbus+ modulation signal input ends of the double operational amplifier differential data acquisition demodulation analog-to-digital conversion module;
the collected data differential amplification signal output end of the double operational amplifier differential data collection demodulation analog-to-digital conversion module is connected with the collected data signal input end of the CPU;
the collected data signal output end of the CPU is connected with the collected data signal input end of the meter reading platform/local meter reading control module.
On the basis of the hardware of the M-Bus master station multichannel intelligent meter reading remote transmission device, the invention also provides an M-Bus master station multichannel intelligent meter reading remote transmission meter reading method, which comprises the following steps:
1) The CPU judges whether the meter reading request signal input end of the meter reading platform/the meter reading request signal output end of the local meter reading control module transmits meter reading request signals; then, enter step 2);
2) The CPU reads all address information to be read pre-stored in a storage device of the CPU, judges and calls the address information to be read currently, and aiming at the address information to be read currently, the corresponding intelligent channel switch control end of the CPU outputs a switch control signal, and transmits the switch control signal to the switch control signal input end of the corresponding intelligent channel to control the intelligent channel to be opened; then, enter step 3);
3) The meter reading control signal output end of the CPU outputs a current meter reading control signal to be read to the meter reading control signal input end of the 13/36V meter reading signal modulation module, and the meter reading address signal output end of the CPU outputs a current address signal to be read to the meter reading address signal input end of the 13/36V meter reading signal modulation module; after that, step 4) is entered;
4) The CPU receives the current data signal to be read from the data signal input end of the dual operational amplifier differential data acquisition and demodulation analog-to-digital conversion module, and stores the current data signal to be read from the data signal input end, and judges whether the received address signal of the meter in the current data signal to be read from the data signal to be read is the last address signal to be read from the meter according to the meter reading sequence, if not, the step 2) is entered, if yes, the step 5) is entered;
5) And the CPU transmits the data signals of all the meters to the collected data signal input end of the meter reading platform/local meter reading control module through the collected data signal output end.
In addition, after the Mbus-modulated signals output by the Mbus-modulated signal output end of the 13/36V meter reading signal modulation module are output to the Mbus-modulated signal input end of the intelligent channel, the Mbus-modulated signals are transmitted to a plurality of bus input ends to be meter-read correspondingly through the bus output end M2-of the intelligent channel, address information in each Mbus-modulated signal to be meter-read corresponds to the address information of the corresponding meter, the meter outputs own data signals to the bus input end M2+ of the intelligent channel through the bus output end of the meter, and then the data signals of the meter are transmitted to the Mbus+ modulated signal input end of the dual-operational amplifier differential data acquisition demodulation analog-digital conversion module through the Mbus+ modulated signal output end of the intelligent channel, and then the dual-operational amplifier differential data acquisition demodulation analog-digital conversion module processes the data signals.
The method comprises the steps that a to-be-meter-read address signal output end of a CPU outputs a current to-be-meter-read address signal to a meter-read control signal input end of a 13/36V meter-read signal modulation module each time, an Mbus-modulation signal output end of the 13/36V meter-read signal modulation module correspondingly outputs an Mbus-modulation signal containing current to-be-meter-read address information, and the Mbus-modulation signal is transmitted to an Mbus-modulation signal input end of an intelligent channel;
then, uploading the data signal of the meter to be read corresponding to the address information in the Mbus-modulated signal to an intelligent channel through a bus, and transmitting the address information of the read meter and the data signal of the meter to an Mbus+ modulated signal input end of a double operational amplifier differential data acquisition demodulation analog-to-digital conversion module by an Mbus+ modulated signal output end of the intelligent channel;
and the CPU sends and receives the data signals until all the data signals to be read are read.
Fig. 2 is a schematic diagram of circuit pins of a CPU, which uses an Atemel processor, and is model AT91SAM9625.
In this embodiment, the CPU has three intelligent channel switch control pins, namely, 23 pins, 24 pins and 83 pins, respectively, which are connected to the switch control signal input ends of the first, second and third intelligent channels respectively; in this embodiment, three intelligent channels are set, and each intelligent channel is connected with 1 to 20 meter reading devices.
The meter reading control signal output end of the CPU is 21 pins, and is connected with the meter reading control signal input end MBUS 485C of the 13/36V meter reading signal modulation module; the output end of the address signal to be read of the CPU is 13 pins, and the input end TXD MBUS of the address signal to be read of the 13/36V meter reading signal modulation module is connected; the circuit diagram of the 13/36V meter reading signal modulation module is shown in fig. 3.
The acquired data differential amplification signal output end RXDMBUS of the dual operational amplifier differential data acquisition demodulation analog-to-digital conversion module is connected with the acquired data signal input end 14 pin of the CPU; the circuit diagram of the dual op-amp differential data acquisition demodulation analog-to-digital conversion module is shown in fig. 4.
FIG. 3 is a schematic circuit diagram of a 13/36V meter reading signal modulation module, wherein the 13/36V meter reading signal modulation module comprises a 36V power supply chip U4, and is provided with a model XL6019 for providing a 36V regulated power supply; the 13/36V meter reading signal modulation module further comprises an MBUS-modulation signal output circuit: the first end of the seventh resistor R7 is connected with the pin 13 of the address signal output end to be read of the CPU, the second end of the seventh resistor R7 is connected with the base electrode of the second NPN transistor N2, and the middle joint of the second end of the seventh resistor R7 and the base electrode of the second NPN transistor N2 is grounded through a ninth resistor R9; the emitter of the second NPN transistor N2 is grounded, the collector of the second NPN transistor N2 is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the grid G of the first MOS transistor Q1, the drain D of the first MOS transistor Q1 is connected with a 36V power supply, the first diode D1 and the fifth resistor R5 form a first parallel circuit, the first parallel circuit is connected between the 36V power supply and the second end of the fourth resistor R4, the positive electrode of the first diode D1 is connected with the second end of the fourth resistor R4, the first parallel circuit is also connected between the drain D of the first MOS transistor Q1 and the grid G thereof, the positive electrode of the first diode D1 is connected with the grid G of the first MOS transistor Q1, the source S of the first MOS transistor Q1 is connected with the positive electrode of the fourth diode D4, the negative electrode of the fourth diode D4 is connected with the drain D of the second MOS transistor Q2, the drain D of the second MOS transistor Q2 and the grid G thereof are also connected with the fifth diode D5 which is connected with the positive electrode of the second MOS transistor Q13 which is connected in parallel with the grid G of the thirteenth resistor; the positive electrode of the fourth diode D4 is also connected with a 13V power supply through a third diode D3 and a second diode D2;
the source electrode S of the second MOS tube Q2 is used for outputting an Mbus-modulated signal to an Mbus-modulated signal input end of the intelligent channel;
the grid of the second MOS transistor Q2 is connected with the collector of a ninth transistor N9 through a nineteenth resistor R19, the emitter of the ninth transistor N9 is grounded, the base of the ninth transistor N9 is connected with the collector of an eighth transistor N8 through a twenty-seventh resistor R27, the collector of the eighth transistor N8 is also connected with a CVCC1 power supply through a fifteenth resistor R15, the emitter of the eighth transistor N8 is grounded, the base of the eighth transistor N8 is connected with the collector of a seventh transistor N7, the collector of the seventh transistor N7 is also connected with a 3.3V power supply through a sixteenth resistor R16, the emitter of the seventh transistor N7 is grounded, and the base of the seventh transistor N7 is connected with a meter reading control signal output pin 21 pin of the CPU through a twenty-fourth resistor R24.
When the CPU sends the meter reading signal to be read to the 13/36V meter reading signal modulation module, the 21 pin of the CPU always outputs high level, and the 13 pin of the CPU outputs the address signal to be read;
the high level output by the 21 pin of the CPU enters the base electrode of a seventh transistor N7 through a resistor R24, the collector electrode and the emitter electrode of the seventh transistor N7 are conducted, the high level of the base electrode of an eighth transistor N8 is pulled down, the eighth transistor N8 is cut off, the base electrode of a ninth transistor N9 is connected to a CVCC1 power supply through resistors R27 and R15, the ninth transistor N9 is conducted, current passes through the resistor R13 and the resistor R19, the voltage loaded on the grid electrode G of a second MOS tube is matched, and the drain electrode D and the source electrode S of the second MOS tube are conducted; when the CPU sends the meter reading signal to be read to the 13/36V meter reading signal modulation module, the pin 21 of the CPU always outputs high level, and the drain electrode D and the source electrode S of the second MOS tube are always conducted;
the address signal to be read output by the 13 pins of the CPU reaches the base electrode of the second triode N2 through the resistor R7, the second triode N2 is controlled to be turned on or off, the address signal to be read output by the 13 pins of the CPU is high/low level information, and the high/low level controls the second triode N2 to be turned on/off.
When the second triode N2 is conducted, the voltage on the grid electrode of the first MOS tube Q1 is pulled high, the drain electrode D and the source electrode S of the first MOS tube Q1 are conducted, a 36V power supply reaches the fourth diode D4 through the drain electrode D and the source electrode S of the first MOS tube Q1 and then reaches the drain electrode D of the second MOS tube Q2, at the moment, the drain electrode D and the source electrode S of the second MOS tube are conducted, and the MBUS-modulated signal output end outputs 36V high level;
when the second triode N2 is cut off, the first MOS tube is cut off, the voltage loaded on the drain electrode D of the second MOS tube is only 13V voltage, the 13V voltage is transmitted to the drain electrode D of the second MOS tube by a C13V power supply through the second diode D2, the third diode D3 and the fourth diode D4, 13V low level is output through the source electrode S of the second MOS tube, and 13V low level is output by the MBUS-modulated signal output end;
fig. 5 is a schematic circuit diagram of an intelligent channel module, and the embodiment uses a first intelligent channel module as an example for explanation: the first end of a sixty-ninth resistor R69 is used for being connected with a first intelligent channel switch control pin 23 of a CPU, the second end of the sixty-ninth resistor R69 is connected with an input side cathode of a third photoelectric coupler OP3, an input side anode of the third photoelectric coupler OP3 is connected with a 3.3V power supply through a sixty-first resistor R61, an output side collector of the third photoelectric coupler OP3 is connected with a CVCC1 power supply through a sixty-third resistor R63, an output side emitter of the photoelectric coupler OP3 is connected with a base electrode of a sixteenth triode N16 through a seventy-ninth resistor R79, a collector electrode of the sixteenth triode N16 is connected with a 10 th pin of a control end of a third signal relay K3, and an emitter of the sixteenth triode N16 is grounded; the 1 st pin of the third signal relay K3 is connected with a C13V power supply, and the 3 rd pin of the third signal relay K3 is used for connecting with a source S of a second MOS tube Q2 in the 13/36V meter reading signal modulation module and receiving an Mbus-modulation signal transmitted by the 13/36V meter reading signal modulation module; the 4 th pin of the third signal relay K3 is connected with the first end of the issuing bus M2-through an eleventh inductive magnetic bead FB11, and the second end of the issuing bus M2-is simultaneously connected with all the issuing address signal input ends to be read; all uploading signal output ends to be checked are connected with the second end of a tenth inductance magnetic bead FB10 through an uploading bus M2+, the first end of the tenth inductance magnetic bead FB10 is connected with the 7 th pin of a third signal relay K3, the 8 th pin of the third signal relay K3 is used for outputting an Mbus+ modulation signal containing a current data signal to be checked and a current address signal to be checked, and the 8 th pin of the third signal relay K3 is used for being connected with the Mbus+ modulation signal input end of the double operational amplifier differential data acquisition demodulation analog-digital conversion module.
When the pin 23 of the first intelligent channel switch control pin of the CPU is changed from high level to low level, the first intelligent channel is started to be opened: the current is generated between the anode and the cathode of the input end of the third photoelectric coupler OP3, the collector and the emitter of the output end of the third photoelectric coupler OP3 are conducted, the base electrode of the sixteenth transistor N16 is high-level through resistors R79 and R63, the sixteenth transistor N16 is conducted, the 10-pin level of the third signal relay K3 is pulled down, the 3-pin of the third signal relay K3 receives the MBUS-modulation signal transmitted by the 13/36V meter reading signal modulation module, the third signal relay K3 outputs the MBUS-modulation signal to the first end of the eleventh inductive magnetic bead FB11 through the 4-th pin thereof, then the second end of the eleventh inductive magnetic bead FB11 is transmitted to the lower transmission bus M2-, the address signal in the received MBUS-modulation signal is analyzed by the lower transmission bus M2-connected to be read, if the address signal of the meter is not corresponding to the meter to be read, the data signal of the meter to be read is not transmitted by the meter to be read by the meter by the user, the data signal to be read by the user is transmitted by the data signal output end of the user, the data signal to be read by the user B3 through the data to the data signal output end of the user, the data to be read by the data signal to be read by the user B, and the data signal to be read by the user B3 is transmitted by the data signal to the data input module B7 through the third pin 7, and the current signal to the Mb 7+ is converted to the data signal to be transmitted by the data signal to the current bus 7 through the third pin 7;
fig. 4 is a schematic circuit diagram of a dual-op differential data acquisition and demodulation analog-to-digital conversion module, in which an mbus+ modulation signal input pin is simultaneously connected with two signal transmission circuits:
the first path is connected with the first end of the twenty-third capacitor C23, and the second path is connected with the first end of the forty-seventh resistor R47;
the first path is as follows: the second end of the twenty-third capacitor C23 is connected with a forty-third resistor R43 in series and then grounded, and the twenty-third capacitor C23 and the forty-third resistor R43 form a first band-pass filter;
the second end of the twenty-third capacitor C23 is connected with the first end of the twenty-first capacitor C21, the second end of the twenty-first capacitor C21 is connected with the forty-second resistor R42 in series and then grounded, and the twenty-first capacitor C21 and the forty-second resistor R42 form a second band-pass filter;
the second end of the twenty-first capacitor C21 is connected in series with a forty-first resistor and then connected to the negative electrode of the input end of the first operational amplifier U8A; a thirty-ninth feedback resistor R39 is connected between the negative electrode of the input end and the output end of the first operational amplifier U8A;
the second path: the second end of the forty-seventh resistor R47 is connected with the fifty-first resistor and then grounded, and the second end of the forty-seventh resistor R47 is also connected with the first end of the twenty-fourth capacitor C24;
the second end of the twenty-fourth capacitor C24 is connected with the fifty-sixth resistor R56 in series and then grounded, and the twenty-fourth capacitor C24 and the fifty-sixth resistor R56 form a third band-pass filter;
the second end of the twenty-fourth capacitor C24 is also connected with the first end of the twenty-fifth capacitor C25, the second end of the twenty-fifth capacitor C25 is connected with the fifty-fourth resistor R54 in series and then grounded, and the twenty-fifth capacitor C25 and the fifty-fourth resistor R54 form a fourth band-pass filter;
the second end of the twenty-fifth capacitor C25 is connected in series with a fifty-first resistor R50 and then connected with the positive electrode of the input end of the first operational amplifier U8A, and the positive electrode of the input end of the first operational amplifier U8A is also connected in series with a fifty-fifth resistor R55 and then grounded;
the output end of the first operational amplifier U8A is connected in series with a thirty-seventh resistor and then is connected with the negative electrode of the input end of the second operational amplifier U8B, a thirty-eighth feedback resistor R38 is connected between the negative electrode of the input end of the second operational amplifier U8B and the output end, the positive electrode of the input end of the second operational amplifier U8B is grounded, and the output end of the second operational amplifier U8B is used for being connected with the input end of the acquired data signal of the CPU.
In the dual-op-amp differential data acquisition demodulation analog-to-digital conversion module, an Mbus+ modulation signal input by an input pin of the Mbus+ modulation signal is divided into two paths:
the first path is input into the negative electrode of the input end of the first operational amplifier U8A after other interference signals are filtered by the first band-pass filter and the second band-pass filter; the second path filters other interference signals through a third band-pass filter and a fourth band-pass filter, and then inputs the interference signals into the positive electrode of the input end of the first operational amplifier U8A; the first path and the second path form input signals with equal signal sizes and opposite polarities, according to the differential amplification principle of the operational amplifier, the current increment of the differential pair transistor is equal in size and opposite in polarity, so that the voltage output to the ground by the pin 1 (OUTA) of the output end of the first operational amplifier U8A is increased, differential mode signals can be effectively amplified, common mode signals are restrained, and the effective signals are amplified and brushed; setting the ratio of the resistor R37 to the resistor R38 as the amplification factor of the second operational amplifier U8B, sending the signal output by the pin 1 of the output end of the first operational amplifier U8A to the pin 6 (INB-) of the input end of the second operational amplifier U8B, comparing the voltages according to the reference of the pin 5 (INB+) of the input end of the second operational amplifier U8B, and outputting a useful digital signal from the pin 7 (OUTB) of the second operational amplifier U8B to the pin 14 of the acquisition data signal input end of the CPU serial port.
The CPU can upload the data of the meter end to the meter reading platform or display the data on a local display screen in a communication mode such as GPRS/Ethernet.
The foregoing is merely illustrative of the present invention and is not intended to limit the scope of the invention. All equivalent changes or modifications made according to the spirit of the main technical solution of the present invention should be included in the scope of the present invention.
Claims (6)
1. M-Bus master station multichannel intelligence remote transmission device that checks meter, its characterized in that includes:
the meter reading platform/local meter reading control module, the CPU, the 13/36V meter reading signal modulation module, the double operational amplifier differential data acquisition and demodulation analog-to-digital conversion module and the plurality of intelligent channel modules, wherein the meter receiving end of each intelligent channel is connected with a plurality of meters; the meter reading request signal output end of the meter reading platform/local meter reading control module is connected with the meter reading request signal input end of the CPU; the switch control ends of all intelligent channels of the CPU are correspondingly connected with the switch control signal input ends of the corresponding intelligent channels one by one; the meter reading control signal output end of the CPU is connected with the meter reading control signal input end of the 13/36V meter reading signal modulation module, and the address signal output end to be meter-read of the CPU is connected with the address signal input end to be meter-read of the 13/36V meter reading signal modulation module; the Mbus-modulation signal output end of the 13/36V meter reading signal modulation module is simultaneously connected with the Mbus-modulation signal input end of each intelligent channel; the bus output end of each intelligent channel is simultaneously connected with the bus input ends of the corresponding multiple tables, and the bus output end of each table is commonly connected with the bus input end of the corresponding intelligent channel; the Mbus+ modulation signal output ends of the intelligent channels are commonly connected with the Mbus+ modulation signal input ends of the double operational amplifier differential data acquisition demodulation analog-to-digital conversion module; the collected data differential amplification signal output end of the double operational amplifier differential data collection demodulation analog-to-digital conversion module is connected with the collected data signal input end of the CPU; the collected data signal output end of the CPU is connected with the collected data signal input end of the meter reading platform/local meter reading control module;
the 13/36V meter reading signal modulation module comprises a 36V power supply chip and is used for providing a 36V stabilized voltage power supply; the 13/36V meter reading signal modulation module further comprises an MBUS-modulation signal output circuit: the first end of the seventh resistor is connected with the address signal output end to be read of the CPU, the second end of the seventh resistor is connected with the base electrode of the second NPN transistor, and the middle joint of the second end of the seventh resistor and the base electrode of the second NPN transistor is grounded through the ninth resistor; the emitter of the second NPN transistor is grounded, the collector of the second NPN transistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the grid of the first MOS transistor, the drain electrode of the first MOS transistor is connected with a 36V power supply, the 36V power supply is provided by a power supply chip U4, the first diode and the fifth resistor form a first parallel circuit, the first parallel circuit is connected between the 36V power supply and the second end of the fourth resistor, the positive electrode of the first diode is connected with the second end of the fourth resistor, the first parallel circuit is also connected between the drain electrode of the first MOS transistor and the grid of the first MOS transistor, the positive electrode of the first diode is connected with the grid of the first MOS transistor, the source electrode of the first MOS transistor is connected with the positive electrode of the fourth diode, the negative electrode of the fourth diode is connected with the drain electrode of the second MOS transistor, a second parallel circuit is also connected between the drain electrode of the second MOS transistor and the grid of the second MOS transistor, and the second parallel circuit is formed by the fifth diode and the thirteenth resistor in parallel connection; the positive electrode of the fourth diode is also connected with a 13V power supply through a third diode and a second diode; the source electrode of the second MOS tube is used for outputting an Mbus-modulated signal to the Mbus-modulated signal input end of the intelligent channel; the grid electrode of the second MOS tube is connected with the collector electrode of the ninth transistor through a nineteenth resistor, the emitter electrode of the ninth transistor is grounded, the base electrode of the ninth transistor is connected with the collector electrode of the eighth transistor through a twenty-seventh resistor, the collector electrode of the eighth transistor is also connected with a CVCC1 power supply through a fifteenth resistor, the emitter electrode of the eighth transistor is grounded, the base electrode of the eighth transistor is connected with the collector electrode of the seventh transistor, the collector electrode of the seventh transistor is also connected with a 3.3V power supply through a sixteenth resistor, the emitter electrode of the seventh transistor is grounded, and the base electrode of the seventh transistor is connected with a meter reading control signal output pin of the CPU through a twenty-fourth resistor;
in the intelligent channel module: the first end of the sixty-ninth resistor is used for being connected with a corresponding intelligent channel switch control pin of the CPU, the second end of the sixty-ninth resistor is connected with an input side cathode of the third photoelectric coupler, an input side anode of the third photoelectric coupler is connected with a 3.3V power supply through the sixty-first resistor, an output side collector of the third photoelectric coupler is connected with a CVCC1 power supply through the sixty-third resistor, an output side emitter of the third photoelectric coupler is connected with a base electrode of a sixteenth third transistor through the seventy-ninth resistor, a collector electrode of the sixteenth third transistor is connected with a 10 th pin of a control end of the third signal relay, and an emitter electrode of the sixteenth third transistor is grounded; the 1 st pin of the third signal relay is connected with a C13V power supply, and the 3 rd pin of the third signal relay is used for connecting with a source electrode of a second MOS tube in the 13/36V meter reading signal modulation module and receiving an Mbus-modulation signal transmitted by the 13/36V meter reading signal modulation module; the 4 th pin of the third signal relay is connected with the first end of the issuing bus M2-through an eleventh inductance magnetic bead, and the second end of the issuing bus M2-is simultaneously connected with all the issuing address signal input ends to be checked; all uploading signal output ends to be checked are connected with the second end of the tenth inductance magnetic bead through an uploading bus M2+, the first end of the tenth inductance magnetic bead is connected with the 7 th pin of the third signal relay K3, the 8 th pin of the third signal relay K3 is used for outputting Mbus+ modulation signals containing current data signals to be checked and current address signals to be checked, and the 8 th pin of the third signal relay K3 is used for being connected with the Mbus+ modulation signal input end of the double operational amplifier differential data acquisition demodulation analog-digital conversion module.
2. The M-Bus master station multichannel intelligent meter reading remote transmission device according to claim 1, wherein: in the dual-op-amp differential data acquisition demodulation analog-to-digital conversion module, an Mbus+ modulation signal input pin of the dual-op-amp differential data acquisition demodulation analog-to-digital conversion module is simultaneously connected with two paths of signal transmission circuits:
the first path is connected with the first end of the twenty-third capacitor, and the second path is connected with the first end of the forty-seventh resistor;
the first path is as follows: the second end of the twenty-third capacitor is connected with a forty-third resistor in series and then grounded, and the twenty-third capacitor and the forty-third resistor form a first band-pass filter;
the second end of the twenty-third capacitor is connected with the first end of the twenty-first capacitor, the second end of the twenty-first capacitor is connected with the forty-second resistor in series and then grounded, and the twenty-first capacitor and the forty-second resistor form a second band-pass filter;
the second end of the twenty-first capacitor is connected in series with a forty-first resistor and then connected with the negative electrode of the input end of the first operational amplifier; a thirty-ninth feedback resistor is connected between the negative electrode of the input end and the output end of the first operational amplifier;
the second path: the second end of the forty-seventh resistor is connected with the fifty-first resistor and then grounded, and the second end of the forty-seventh resistor is also connected with the first end of the twenty-fourth capacitor;
the second end of the twenty-fourth capacitor is connected with the fifty-sixth resistor in series and then grounded, and the twenty-fourth capacitor and the fifty-sixth resistor form a third band-pass filter;
the second end of the twenty-fourth capacitor is also connected with the first end of the twenty-fifth capacitor, the second end of the twenty-fifth capacitor is connected with the fifty-fourth resistor in series and then grounded, and the twenty-fifth capacitor and the fifty-fourth resistor form a fourth band-pass filter;
the second end of the twenty-fifth capacitor is connected with the anode of the input end of the first operational amplifier after being connected with the fifty-fifth resistor in series, and the anode of the input end of the first operational amplifier is also connected with the ground after being connected with the fifty-fifth resistor in series;
the output end of the first operational amplifier is connected in series with a thirty-seventh resistor and then is connected with the negative electrode of the input end of the second operational amplifier, a thirty-eighth feedback resistor is connected between the negative electrode of the input end of the second operational amplifier and the output end, the positive electrode of the input end of the second operational amplifier is grounded, and the output end of the second operational amplifier is used for being connected with the input end of the acquisition data signal of the CPU.
3. The M-Bus master station multichannel intelligent meter reading remote transmission device according to claim 2, wherein: the CPU adopts an Atemel processor.
4. A meter reading method applied to the M-Bus master station multichannel intelligent meter reading remote transmission device as set forth in any one of claims 1-3, characterized by comprising the following steps:
1) The CPU judges whether the meter reading request signal input end of the meter reading platform/the meter reading request signal output end of the local meter reading control module transmits meter reading request signals; then, enter step 2);
2) The CPU reads all address information to be read pre-stored in a storage device of the CPU, judges and calls the address information to be read currently, and aiming at the address information to be read currently, the corresponding intelligent channel switch control end of the CPU outputs a switch control signal, and transmits the switch control signal to the switch control signal input end of the corresponding intelligent channel to control the intelligent channel to be opened; then, enter step 3);
3) The meter reading control signal output end of the CPU outputs a meter reading control signal to be read currently to the meter reading control signal input end of the 13/36V meter reading signal modulation module, and the address signal to be read currently is output to the address signal to be read input end of the 13/36V meter reading signal modulation module by the address signal to be read output end of the CPU; after that, step 4) is entered;
4) The CPU receives the current data signal to be read from the data signal input end of the dual operational amplifier differential data acquisition and demodulation analog-to-digital conversion module, and stores the current data signal to be read, and the CPU judges whether the received meter address signal in the current data signal to be read is the last address signal to be read according to the reading sequence, if not, the step 2) is entered, if yes, the step 5) is entered;
5) And the CPU transmits the data signals of all the meters to the collected data signal input end of the meter reading platform/local meter reading control module through the collected data signal output end.
5. The meter reading method of claim 4, wherein: and after the Mbus-modulated signals output by the Mbus-modulated signal output end of the 13/36V meter reading signal modulation module are output to the Mbus-modulated signal input end of the intelligent channel, the Mbus-modulated signals are transmitted to a plurality of bus input ends to be meter-read correspondingly through the bus output end M2-of the intelligent channel, if the address information in each Mbus-modulated signal to be meter-read corresponds to the address information, the meter outputs the data signals of the meter to the bus input end M2+ of the intelligent channel through the bus output end of the meter, and then the data signals of the meter are transmitted to the Mbus+ modulated signal input end of the double operational amplifier differential data acquisition demodulation analog-digital conversion module through the Mbus+ modulated signal output end of the intelligent channel, and then the double operational amplifier differential data acquisition demodulation analog-digital conversion module processes the data.
6. The meter reading method of claim 5, wherein: the method comprises the steps that a to-be-meter-read address signal output end of a CPU outputs a current to-be-meter-read address signal to a meter-read control signal input end of a 13/36V meter-read signal modulation module each time, an Mbus-modulation signal output end of the 13/36V meter-read signal modulation module correspondingly outputs an Mbus-modulation signal containing current to-be-meter-read address information, and the Mbus-modulation signal is transmitted to an Mbus-modulation signal input end of an intelligent channel;
then, uploading the data signal of the meter to be read corresponding to the address information in the Mbus-modulated signal to an intelligent channel through a bus, and transmitting the address information of the read meter and the data signal of the meter to an Mbus+ modulated signal input end of a double operational amplifier differential data acquisition demodulation analog-to-digital conversion module by an Mbus+ modulated signal output end of the intelligent channel;
and the CPU sends and receives the data signals until all the data signals to be read are read.
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| CN107464411A (en) * | 2017-09-25 | 2017-12-12 | 河南卓正电子科技有限公司 | A kind of MBUS circuits being used in automatic meter reading system |
| CN207909118U (en) * | 2018-02-08 | 2018-09-25 | 湖南东润智能仪表有限公司 | A kind of M-bus channel selection circuits |
| CN108492542A (en) * | 2018-04-03 | 2018-09-04 | 辛成辉 | A kind of improved electric energy meter copying device |
| CN108417002A (en) * | 2018-04-09 | 2018-08-17 | 南通德高环境监测技术有限公司 | A kind of high-performance MBUS collectors for water meter |
| CN209028810U (en) * | 2018-12-13 | 2019-06-25 | 湖南常德牌水表制造有限公司 | A kind of M-Bus main website multi-channel intelligent meter reading remote transmission device |
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