CN205405189U - MBUS calorimeter data acquisition controller transmitting circuit - Google Patents

Abstract

MBUS calorimeter data acquisition controller transmitting circuit, including high level power and low level power and singlechip, the positive pole at diode D2 is connected to the low level power, MBUS's transmitting terminal is connected to diode D2's negative pole, high level power output connects on the MOS pipe, the grid of MOS pipe is connected on the control signal circuit of singlechip output, the high level power after the output of MOS pipe the connection at diode D2's negative pole, the control signal circuit of singlechip output including connecting the resistance R8 on the singlechip serial ports, be connected with triode Q1 behind the resistance R8, be connected with resistance R9 behind the audion Q1, resistance R9 and high level power output are connected and are connected with resistance R10 between the tip that MOS managed. It is quick when this circuit switches, there is not the pressure drop to the messenger sends and not influenced by the load circuit impedance.

Description

MBUS calorimeter data acquisition controller transtation mission circuit

Technical field

This utility model relates to a kind of MBUS calorimeter data acquisition controller transtation mission circuit of calorimeter metering, belongs to control circuit technical field.

Background technology

The Major Strategic that energy-saving and emission-reduction are countries is disposed.Heat supply in winter consumes a large amount of heat energy, and the past adopts the Scientific Measurement being not suitable with the energy by the metering method of area charge, wastes substantial amounts of energy consumption.Live to build now portion's installation at popularization family, whole nation calorimeter, carry out the on-demand use of heat, spend multiplex more, need not spend, having promoted the efficient utilization to heat energy, the central heating of current China, heating system meterage gradually spread out, and metering device main in thermal substation is exactly calorimeter.Calorimeter is a kind of electromechanical integration instrument based on microprocessor and high-precision sensor, and with the gauge table that building industry has commonly used in the past, such as water meter, ammeter, gas meter are compared, and it has more complicated design and higher technology content.Calorimeter passes through temperature and two kinds of sensors of flow, records heat carrier respectively at the temperature imported and exported and flow, obtains caloric value then through compensation and the integral and calculating of density and heat enthalpy value.Meter bus MBus(Meter-Bus) it is a kind of bus protocol exclusively for the design of calorimeter remote data transmission, it is to measure a kind of important technology that instrumented data is transmitting digitized, have been widely used for heat metering field, and become a part (European standard EN1434-3) for the heat metering standard in Europe.MBus transtation mission circuit is to ensure that the basis of its normal operation, in traditional MBUS calorimeter data acquisition controller, the switching between low and high level is slow, and have pressure drop to produce, it is subject to the impact of load circuit impedance when causing sending meter reading signal, ultimately results in the less reliable of data.

Summary of the invention

The purpose of this utility model is in that the problems referred to above overcoming existing calorimeter data acquisition controller transtation mission circuit to exist, it is provided that a kind of MBUS calorimeter data acquisition controller transtation mission circuit.

nullFor realizing the purpose of this utility model，Have employed following technical scheme: MBUS calorimeter data acquisition controller transtation mission circuit，Including high level power supply and low level power and single-chip microcomputer，It is characterized in that: low level power is connected to the positive pole of diode D2，The negative pole of diode D2 connects the transmitting terminal of MBUS，The output of high level power supply is connected on metal-oxide-semiconductor，The grid of metal-oxide-semiconductor is connected on the control signal circuit of single-chip microcomputer output，High level power supply is connected to the negative pole of diode D2 after metal-oxide-semiconductor exports，The control signal circuit of described single-chip microcomputer output includes the resistance R8 being connected on microcontroller serial port，Audion Q1 it is connected to after resistance R8，Resistance R9 it is connected to after triode Q1，Resistance R9 is connected between the end of metal-oxide-semiconductor with the output of high level power supply and is connected to resistance R10，The grid of metal-oxide-semiconductor is connected after resistance R9，When the serial ports of single-chip microcomputer exports electronegative potential，Triode Q1 is not turned on，Metal-oxide-semiconductor is not turned on，Diode D2 turns on，The transmitting terminal of MBUS obtains low level voltage；When the serial ports of single-chip microcomputer exports high potential, triode Q1 turns on, the grid of metal-oxide-semiconductor makes metal-oxide-semiconductor turn on after obtaining driving voltage, metal-oxide-semiconductor after conducting makes diode D2 end, the transmitting terminal of MBUS obtains high level voltage, further, 220V power supply is adopted to be converted to 12V power supply through power supply adaptor, 12V power supply is converted to 5V power supply through MCP1703 chip and powers to single-chip microcomputer, 12V power supply is converted to high level power supply through XL6009 chip, high level power supply is converted to low level power by 78M24 chip, described high level power supply is 36V power supply, low level power is 24V power supply, further, described XL6009 chip has Enable Pin, Enable Pin is connected in the I/O interface of single-chip microcomputer.

Positive Advantageous Effects of the present utility model is in that: this transtation mission circuit adopts two-way LDO voltage and 36v and 24V, output low and high level is switched over by metal-oxide-semiconductor, namely calorimeter MBUS receives 1 and 0 required for circuit, LDO is voltage stabilization in output power range, metal-oxide-semiconductor is quick when switching, there is no pressure drop, so that not affected by load circuit impedance when sending meter reading signal, ensure stabilization of level, ensure that the reliability of data on circuit simultaneously, chip XL6009 has Enable Pin, its work can be controlled by the I/O port of single-chip microcomputer, when single-chip microcomputer detects short circuit, this enable port can be passed through and close the output of MUBS, ensure the safety of whole system.

Accompanying drawing explanation

Fig. 1 is 12V power conversion 36V power circuit principle figure of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Detailed description of the invention

In order to explain enforcement of the present utility model more fully, it is provided that embodiment of the present utility model.These embodiments are only to elaboration of the present utility model, are not intended to scope of the present utility model.

nullIn conjunction with accompanying drawing to the further details of explanation of this utility model，With high level power supply for 36V in this utility model、Low level power is 24V is that example illustrates，Actually，All suitable in MBUS's and the high level power supply matched and low level power all can use，The square frame that in accompanying drawing 2, TX1 connects is single-chip microcomputer，In figure，220V power supply is converted to 12V power supply through power supply adaptor，12V power supply is converted to 5V power supply through MCP1703 chip and powers to single-chip microcomputer，12V power supply is converted to 36V DC source through XL6009 chip，I.e. high level power supply，36V power supply is converted to low level power by 78M24 chip，Low level power is 24V power supply，XL6009 chip has Enable Pin，Enable Pin is connected in the I/O interface of single-chip microcomputer，The output of 24V power supply is connected to the positive pole of diode D2，The negative pole of diode D2 connects the transmitting terminal of MBUS，The output of 36V power supply is connected on metal-oxide-semiconductor，The grid of metal-oxide-semiconductor is connected on the control signal circuit of single-chip microcomputer output，36V power supply is connected to the negative pole of diode D2 after metal-oxide-semiconductor exports，The control signal circuit of described single-chip microcomputer output includes the resistance R8 being connected on microcontroller serial port，Audion Q1 it is connected to after resistance R8，Resistance R9 it is connected to after triode Q1，Resistance R9 and 36V power supply exports and is connected to resistance R10 between the end being connected metal-oxide-semiconductor，The grid of metal-oxide-semiconductor is connected after resistance R9，When the serial ports of single-chip microcomputer exports electronegative potential，Triode is not turned on，Metal-oxide-semiconductor is not turned on，Diode D2 turns on，The transmitting terminal of MBUS obtains 24V voltage，I.e. logic low；When the serial ports of single-chip microcomputer exports high potential, triode turns on, the grid of metal-oxide-semiconductor makes metal-oxide-semiconductor turn on after obtaining driving voltage, metal-oxide-semiconductor after conducting makes diode D2 end, the transmitting terminal of MBUS obtains 36V voltage, i.e. logic high, filter capacitor C13 is have employed when the output of 36V power supply is to 78M24, filter capacitor C10 is have employed when the output of 36V power supply is to metal-oxide-semiconductor, in Fig. 2, audion Q1 adopts TIP41C, R8=1k Ω, R9=1k Ω, R10=3.921k Ω, level output area on microcontroller serial port is at 0-5V, metal-oxide-semiconductor adopts AOD409, diode D5 is connected between MBUS+ and MBUS-.In this utility model, 12V direct current, by the 36V direct current obtained after chip XL6009 boosting, then passes through 78M24 and is converted to 24V.TX1 is that serial port of single chip computer sends pin, and when TX1 is high level, audion TIP41C turns on, and field effect transistor AOD409 turns on, and bus exports 36V direct current, for logic high.When TX1 is low level, audion TIP41C is not turned on, and 24V direct current connects bus through D2, exports 24v, and bus is logic low.MBUS adopts two-wire system, and MBUS transtation mission circuit connects single line, and additionally single line connects MBUS reception circuit, and chip XL6009 has Enable Pin, can be turned off by Single-chip Controlling, when detecting that method is raw in short-term, can complete switch off the voltage of transtation mission circuit.

After describing embodiment of the present utility model in detail, one of ordinary skilled in the art is clearly understood that, various change and amendment can be carried out under without departing from above-mentioned claim and spirit, all any simple modification, equivalent variations and modifications above example made according to technical spirit of the present utility model, belong to the scope of technical solutions of the utility model, and this utility model is also not only restricted in description the embodiment of example.

Claims (3)

1. null1.MBUS calorimeter data acquisition controller transtation mission circuit，Including high level power supply and low level power and single-chip microcomputer，It is characterized in that: low level power is connected to the positive pole of diode D2，The negative pole of diode D2 connects the transmitting terminal of MBUS，The output of high level power supply is connected on metal-oxide-semiconductor，The grid of metal-oxide-semiconductor is connected on the control signal circuit of single-chip microcomputer output，High level power supply is connected to the negative pole of diode D2 after metal-oxide-semiconductor exports，The control signal circuit of described single-chip microcomputer output includes the resistance R8 being connected on microcontroller serial port，Audion Q1 it is connected to after resistance R8，Resistance R9 it is connected to after triode Q1，Resistance R9 is connected between the end of metal-oxide-semiconductor with the output of high level power supply and is connected to resistance R10，The grid of metal-oxide-semiconductor is connected after resistance R9，When the serial ports of single-chip microcomputer exports electronegative potential，Triode Q1 is not turned on，Metal-oxide-semiconductor is not turned on，Diode D2 turns on，The transmitting terminal of MBUS obtains low level voltage；When exporting high potential on the serial ports of single-chip microcomputer, triode Q1 turns on, and the grid of metal-oxide-semiconductor makes metal-oxide-semiconductor turn on after obtaining driving voltage, and the metal-oxide-semiconductor after conducting makes diode D2 end, and the transmitting terminal of MBUS obtains high level voltage.
2. 2. MBUS calorimeter data acquisition controller transtation mission circuit according to claim 1, it is characterized in that: adopt 220V power supply to be converted to 12V power supply through power supply adaptor, 12V power supply is converted to 5V power supply through MCP1703 chip and powers to single-chip microcomputer, 12V power supply is converted to high level power supply through XL6009 chip, high level power supply is converted to low level power by 78M24 chip, described high level power supply is 36V power supply, and low level power is 24V power supply.
3. 3. MBUS calorimeter data acquisition controller transtation mission circuit according to claim 2, it is characterised in that: described XL6009 chip has Enable Pin, and Enable Pin is connected in the I/O interface of single-chip microcomputer.