CN207454883U - A kind of MBUS control circuits for temperature-sensing valve - Google Patents

Abstract

The utility model provides a kind of MBUS control circuits for temperature-sensing valve, microcontroller including being used to control temperature-sensing valve, the rectification circuit of MBUS buses connection, the power supply circuit for being used to power to microcontroller being connected with rectification circuit, the power supply circuit includes providing the 6mA constant-current sources of element task electric current to microcontroller and providing high current to microcontroller simultaneously receiving the 20mA controllable constant-currents source of microcontroller transmission signal and the constant-current control circuit of receiving host signal, the 20mA controllable constant-currents source includes constant-current source I1 with receiving the control circuit of single-chip microcomputer signal, the receiving circuit that the low and high level that host is sent is switched to the low and high level signal that microcontroller can identify is connected on the rectification circuit.The 20mA controllable constant-currents source that the utility model uses is by receiving the data interaction between the completion of slave signal and host, low and high level on host can be converted to slave by used receiving circuit can like the signal of identification, i.e., solve power supply and communication issue between host and slave by two power cords.

Description

A kind of MBUS control circuits for temperature-sensing valve

Technical field

The utility model belongs to control circuit technical field, and in particular to a kind of MBUS control circuits for temperature-sensing valve.

Background technology

MBUS is a kind of bus protocol exclusively for the design of calorimeter remote data transmission, it is measuring instrumentss data transmission A kind of digitized important technology has been widely used for the acquisition field of no source contact such as data such as water, electricity, gas, heat energy meter It closes.MBUS because its it is nonpolarity, easy for construction the advantages that, more and more applied, for example, heat supply and supply water etc. fields application Very extensively, but all it is only to be used to communicate by MBUS, also there are some enterprises to be used to power by MBUS, such as direct MBUS rear ends The shortcomings that increase DCDC decompression chips, this scheme is when load current becomes larger, and bus current is present with shake, causes MBUS Host receives the data of mistake；Also there are some enterprises using constant-current source mode, but only use a constant-current source and electric current is inclined Greatly, it is when loading lighter the shortcomings that this scheme, high current utilization rate is very low, and energy wastes, and causes damages.

Utility model content

The utility model provide it is a kind of for the MBUS control circuits of temperature-sensing valve to overcome above two technology the defects of, pole It is big to improve communication stability and current utilization rate.

In order to solve the above technical problems, used technical solution：

A kind of MBUS control circuits for temperature-sensing valve, microcontroller, the connection of MBUS buses including being used to control temperature-sensing valve Rectification circuit, the power supply circuit for being used to power to microcontroller that is connected with rectification circuit, the power supply circuit includes to monolithic Machine, which provides the 6mA constant-current sources of element task electric current and provides high current to microcontroller, can simultaneously receive the 20mA of microcontroller transmission signal Controllable constant-current source and the constant-current control circuit for the receiving host signal being connected with 6mA constant-current sources, the 20mA controllable constant-currents source Including providing the constant-current source I1 of high current with receiving single-chip microcomputer signal and controlling the control circuit of constant-current source I1, the control circuit Base stage including triode Q4 and triode Q6, the triode Q4 receives the signal of microcontroller transmission by resistance R6, described The emitter of triode Q4 is exported by the collector that resistance R3 receives high current and passes through triode Q4 to resistance R9, the electricity Resistance R9 is connected with the base stage of triode Q6 and passes through the collector of triode Q6 and exports to resistance R7, the resistance R7 and constant-current source I1 connections, the emitter of the triode Q6 connect simulation ground, and the resistance R9 connects simulation ground, the constant-current source by resistance R10 I1 is connected with rectification circuit.

Further, the power supply circuit further includes the receiving host signal being connected with 20mA controllable constant-currents source and provides total The bus-powered control circuit of line power supply, the bus-powered control circuit include triode Q5, PMOS tube Q1 and diode The base stage of D1, the triode Q5 receive single-chip microcomputer signal by resistance R5, and the emitter of the triode Q5 meets simulation ground, institute The collector of triode Q5 is stated by the G feet of resistance R4 connection PMOS tube Q1 and passes through resistance R2 and is connected with the S feet of PMOS tube Q1, The D feet of the PMOS tube Q1 are connected with the anode of diode D1, and the resistance R5 connects simulation ground by resistance R8.

Further, the super capacitor control circuit powered when being connected on the microcontroller for powering off, it is described super Capacitor control circuit is included through the super capacitor C14 capacitor charging circuits connected and capacitor discharging circuit, and the capacitance charges Circuit includes triode Q17, PMOS tube Q15 and the base stage of diode D15, the triode Q17 receive master by resistance R37 Machine signal simultaneously passes through the collector of triode Q17 and connects the G feet of resistance R35 and PMOS tube Q15, the D of the PMOS tube Q15 respectively Foot is exported by the S feet that resistance R33 receives 5V voltages and passes through PMOS tube Q15 to diode D15, and the diode D15's is another One end is exported to super capacitor C14, the D feet of another termination PMOS tube Q15 of the resistance R35, and the resistance R37 passes through series connection Resistance R39 ground connection；The capacitor discharging circuit includes triode Q16 and PMOS tube Q14, the resistance R36 receiving hosts letter Number and by the base stage of the triode Q16 by resistance R36 receiving hosts signal and pass through triode collector export to The G feet of resistance R34 and PMOS tube Q14, the D feet of the PMOS tube Q14 receive the voltage of super capacitor C14 outputs and pass through PMOS The S feet output of pipe Q14, the resistance R36 connect simulation ground by the resistance R38 of series connection.

Further, the power supply circuit output voltage is provided to microcontroller after being converted by DCDC reduction voltage circuits, described DCDC reduction voltage circuits include DCDC and are depressured chip, the 5th pin connection 6mA constant-current sources of the DCDC decompressions chip, the first pin It is exported by capacitance C9 to power inductance L1, the other end of the power inductance L1 is exported to filter circuit, and second pin connects mould Intend ground, the 3rd pin is exported by divider resistance R23 to filter circuit, and the divider resistance R23 connects mould by divider resistance R27 Intend ground, the divider resistance R18 that the 4th pin is connected by diode D12 connections with 6mA constant-current sources, the divider resistance R18 leads to It crosses divider resistance R28 and connects simulation ground, the 4th pin connects simulation ground by capacitance C13.

Further, it is connected on the rectification circuit and the low and high level that host is sent is switched to what microcontroller can identify The receiving circuit of low and high level signal, the receiving circuit include diode D8, triode Q10 and triode Q12, and described two Pole pipe D8 is connected with rectification circuit by resistance R14 and passes through the emitter of resistance R17 and triode Q10, the triode Q10 Collector exported by resistance R24 to triode Q12 base stages, the emitter of the triode Q12 connects simulation ground, the resistance R24 connects simulation ground by resistance R29, and the collector of the triode Q12 receives 3.3V voltages and and microcontroller by resistance R26 It connects and sends data to microcontroller.

The MBUS control circuits for temperature-sensing valve that the utility model uses are powered using double constant current source modules to slave, Element task electric current is provided to slave using 6mA constant-current sources, passes through 20mA controllable constant-currents source when 6mA constant current source current deficiencies High current is provided to slave；Used 20mA constant-current sources can receive slave signal, and host demodulates slave by permanent profit source I1 to be believed Number, i.e., 20mA controllable constant-currents source completes that data interaction of the slave to host is powered while completed to slave；Used bus supplies Electric control circuit can provide bus-powered in 6mA constant-current sources and the source electricity shortage of 20mA controllable constant-currents to slave；It is used Super capacitor control circuit is powered to the back-end when powering-off state occurs in slave detection, reduces circut breaking and power-off time, solution The problem of certainly client the powering-off state lower maintenance period occurs and can not power, increases customer satisfaction degree.

Description of the drawings

Fig. 1 is the analog circuit schematic diagram of the utility model；

In figure：1st, rectification circuit；2nd, 6mA constant-current sources；3rd, 20mA controllable constant-currents source；4th, bus-powered control circuit；5、 DCDC reduction voltage circuits；6th, stabilized power source chip circuit；7th, receiving circuit；8th, super capacitor control circuit；9th, constant-current control circuit； 10th, bus-powered detection circuit；11st, reverse leakage protection circuit；12nd, accumulator；13rd, filter circuit.

Specific embodiment

The utility model is described in further detail with reference to circuit the drawings and specific embodiments.

MBUS control circuits described in the utility model for temperature-sensing valve include microcontroller, rectification circuit 1, power supply electricity Road, accumulator 12, DCDC reduction voltage circuits 5, filter circuit 13, stabilized power source chip circuit 6, receiving circuit 7, super capacitor control Circuit 8 processed, reverse leakage protection circuit 11, accumulator 12 and filter circuit 13, wherein to include 6mA permanent for the power supply circuit Stream source 2,20mA controllable constant-currents source 3 and bus-powered control circuit 4 and constant-current control circuit 9.

As described in Figure 1, the rectification circuit is connected by two power cords with MBUS buses, wherein the 6mA constant-current sources 2 Fuse F2 is connected by rectification circuit with receiving circuit 7, so as to be connected with MBUS buses, 3 He of 20mA controllable constant-currents source Bus-powered control circuit 4 connects fuse F1 by rectification circuit, so as to be connected with MBUS buses.The 6mA constant-current sources are used In the operating current that basis is provided to microcontroller, including triode Q7 and triode Q8 and diode D9, the triode Q8 Collector be connected by resistance R11 with rectification circuit, the emitter of the triode Q8 is exported by diode D9 to energy storage Circuit 12 simultaneously passes through accumulator and exports to DCDC reduction voltage circuits, and the accumulator 12 is capacitance C2, the capacitance being connected in parallel The collector of C3 and capacitance C4, the triode Q7 connect rectification circuit, and the base stage of the triode is connected with resistance R11, institute It states the base stage of triode Q8 and simulation ground, the size of current of the 6mA perseverances power supply is connect by resistance R16 with the emitter of triode Q7 It is controlled by resistance R11.

The 20mA controllable constant-currents source includes providing the constant-current source I1 of high current with receiving single-chip microcomputer signal and controlling constant current The control circuit of source I1, the constant-current source I1 include triode Q3 and triode Q2, the triode Q2 by resistance R1 with it is whole Current circuit connects and controls the size of current of constant-current source I1 and pass through the collector of triode Q2 and exports to diode D7, and described two The other end of pole pipe D7 exports to accumulator 12 and passes through accumulator and export to DCDC reduction voltage circuits, the triode Q2's Base stage is connected with the collector of triode Q3, and the triode Q3 is connected by resistance R7 with control circuit, the triode Q3 Emitter be connected with rectification circuit；The control circuit includes triode Q4 and triode Q6, the base of the triode Q4 Pole receives the signal of microcontroller transmission by resistance R6, and the emitter of the triode Q4 receives high current by resistance R3 and leads to The collector for crossing triode Q4 is exported to resistance R9, and the resistance R9 is connected with the base stage of triode Q6 and passes through triode Q6's Collector is exported to resistance R7, and the emitter of the triode Q6 connects simulation ground, and the resistance R9 connects simulation by resistance R10 Ground.When it is high level that the microcontroller that resistance R6 is received, which sends signal, triode Q4 cut-offs so that triode Q6 ends, so as to No current is made to pass through diode D7；When received signal is low level, triode Q4 conductings so that triode Q6 is turned on, from And constant-current source I1 is made to power by DCDC reduction voltage circuits to microcontroller, while host can be by the demodulation of constant-current source I1 received signals For TTL signal, slave is completed to the data interaction between host.

As shown in Figure 1, the constant-current control circuit 9 includes triode Q9 and diode D10, the current collection of the triode Q9 Pole is by resistance R12 receiving host signals, and the emitter of the triode Q9 is connected with diode D10 and to pass through resistance R15 defeated Go out to DCDC reduction voltage circuits, the base stage of wherein triode Q9 connects simulation ground, and resistance R12 connects simulation ground by divider resistance R13.

The bus-powered control circuit is connected with 20mA controllable constant-currents source, for passing through after receiving host signal to monolithic Machine offer is bus-powered, passes through resistance R5 including triode Q5, PMOS tube Q1 and diode D1, the base stage of the triode Q5 Single-chip microcomputer signal is received, the emitter of the triode Q5 connects simulation ground, and the collector of the triode Q5 is connected by resistance R4 It connects the G feet of PMOS tube Q1 and passes through resistance R2 and be connected with the S feet of PMOS tube Q1, the D feet of the PMOS tube Q1 are with diode D1's Anode connects, and the resistance R5 connects simulation ground by resistance R8.When divider resistance R5 and resistance R8 receptions are high level signal When, triode Q5 forms conducting, and passes through resistance R2 and resistance R4 partial pressure PMOS tube Q1 conductings, total so as to carry out to the back-end Line is powered；When divider resistance R5 and resistance R8 receptions are high level signal, triode Q5 forms cut-off, bus-powered to cut It is disconnected.

As shown in Figure 1, the output voltage of the power supply circuit is exported after being converted by DCDC reduction voltage circuits to microcontroller, The DCDC reduction voltage circuits 5 include DCDC and are depressured chip, and the DCDC is depressured the 5th pin VIN connection 6mA constant-current sources of chip, First pin BST is exported by capacitance C9 to power inductance L1, and the other end of the power inductance L1 is exported to filter circuit 13, The second pin GND of the DCDC decompressions chip connects simulation ground, and the 3rd pin FB is exported by divider resistance R23 to filtered electrical Road, the divider resistance R23 connect simulation ground by divider resistance R27, and the 4th pin EN is permanent by diode D12 connections and 6mA The divider resistance R18, the divider resistance R18 of stream source connection connect simulation ground by divider resistance R28, and the 4th pin EN leads to It crosses capacitance C13 and connects simulation ground；Wherein described filter circuit 13 include the capacitance C12 being together in parallel that is connected with power inductance L1 and Capacitance C10, the capacitance C12 and capacitance C10 exported by parallel power magnetic bead FB1 and power magnetic bead FB2 to capacitance C7 and Capacitance C11, the capacitance C7 and capacitance C11 Parallel opertations to microcontroller are powered.The power supply circuit is filled to accumulator Electricity, when circuit voltage reduces, DCDC decompression chips start to work and filter ripple in output voltage by filter circuit, simultaneously 4th pin EN is controlled by resistance R18 and resistance R28 and diode D12, prevent circuit voltage drop to than it is relatively low when DCDC decompression chips, which further drag down voltage, causes circuit operation irregularity.

As shown in Figure 1, the super capacitor control circuit 8 powered when being connected on the microcontroller for powering off and with it is super The connection of capacitor control circuit 8 is for the reverse leakage protection circuit 11 to shield during slave electric leakage, the super capacitor control Circuit processed includes passing through the super capacitor C14 capacitor charging circuits connected and capacitor discharging circuit, the capacitor charging circuit bag The base stage for including triode Q17, PMOS tube Q15 and diode D15, the triode Q17 passes through resistance R37 receiving host signals And the collector for passing through triode Q17 connects the G feet of resistance R35 and PMOS tube Q15 respectively, the D feet of the PMOS tube Q15 pass through Resistance R33 receives 5V voltages and passes through the S feet of PMOS tube Q15 and exports to diode D15, and the other end of the diode D15 is defeated Go out to super capacitor C14, the D feet of another termination PMOS tube Q15 of the resistance R35, the resistance that the resistance R37 passes through series connection R39 is grounded；The capacitor discharging circuit includes triode Q16 and PMOS tube Q14, and the resistance R36 receiving hosts signal simultaneously leads to The base stage of the triode Q16 is crossed by resistance R36 receiving hosts signal and passes through the collector of triode and exports to output extremely The G feet of resistance R34 and PMOS tube Q14, the D feet of the PMOS tube Q14 receive the voltage of super capacitor C14 outputs and pass through PMOS The S feet output of pipe Q14, the resistance R36 connect simulation ground by the resistance R38 of series connection；The reverse leakage protection circuit 11 wraps Include diode D13, the resistance R30 being connected with super capacitor control circuit and the triode Q13 for receiving signal, the triode The base stage of Q13 is connected with diode D13 and resistance R30, and collector and the regulated power supply chip circuit of the triode Q13 connect It connects, so as to shield in the case of triode Q13 conductings, the emitter of the triode Q13 connects simulation ground；It is described steady Determine power supply chip circuit to be connected with microcontroller using power supply chip U1 and shunt capacitance C5, capacitance C6 and capacitance C8, realize steady Fixed power supply, the capacitance C8 receive the input of 3.3V voltages.

It can be identified as shown in Figure 1, be connected on the rectification circuit low and high level that host is sent switching to microcontroller Low and high level signal receiving circuit 7 and provide the bus-powered detection circuit 10 that is detected of voltage to MBUS buses, The receiving circuit 7 include diode D8, triode Q10 and triode Q12, the diode D8 by resistance R14 with it is whole Current circuit connects and passes through the emitter of resistance R17 and triode Q10, and the collector of the triode Q10 is defeated by resistance R24 Go out to triode Q12 base stages, the emitter of the triode Q12 connects simulation ground, and the resistance R24 connects simulation by resistance R29 Ground, the collector of the triode Q12 receive 3.3V voltages by resistance R26 and are connected with microcontroller and send number to microcontroller According to；When bus circuit does not communicate, since diode D8 has pressure drop, the voltage of capacitance C1 is slightly less than bus voltage, three poles The emitter voltage of pipe Q10 is less than base voltage, and triode Q10 cut-offs, triode Q12 base stages are low level at this time, so as to three Pole pipe Q12 ends, and it is high level to cause the MCU_RX signals sent to slave；When bus communication, bus voltage can decline 12V or so, at this time the emitter voltage of triode Q10 be more than base voltage, triode Q10 conductings, the at this time base of triode Q12 Pole receiving voltage turns on triode Q12, so as to which the MCU_RX signals sent to slave are low level, completes host and slave Between data exchange；The bus-powered detection circuit 10 includes triode Q11, and the collector of the triode Q11 passes through Resistance R20 is pulled upward to 3.3V voltages, and bus voltage generates partial pressure by resistance R21 and R25, which is reached by resistance R22 The base stage of triode Q11, bus has electricity, and then triode Q11 is turned on, and EPOWER is low level, and without electricity, then triode Q11 is cut bus Only, EPOWER is high level.The emitter of the triode Q11 connects simulation ground.

Operation principle：The MBUS control circuits for temperature-sensing valve that the utility model uses are completed using two power cords Data interaction and power supply between host and slave；Using double constant current source modules to slave power, i.e., using 6mA constant-current sources to from Machine provides element task electric current, and high current, institute are provided to slave by 20mA controllable constant-currents source when 6mA constant current source current deficiencies The bus-powered control circuit used can provide bus in 6mA constant-current sources and the source electricity shortage of 20mA controllable constant-currents to slave Power supply, while powered to the back-end by super capacitor control circuit when short-circuit conditions occurs in slave detection；Used 20mA Control circuit on constant-current source receives slave signal, and host demodulates slave signal by permanent profit source I1, completes to power to slave Data interaction of the slave to host is completed simultaneously, so as to control the switch motion of temperature-sensing valve；Used receiving circuit sends out host The low and high level sent switchs to the low and high level signal that microcontroller can identify, completes the data interaction between host and slave.

Embodiment described above is only that the preferred embodiment of the utility model is described, not to this practicality New scope is defined, and on the premise of the spirit of the design of the utility model is not departed from, those of ordinary skill in the art are to this The various modifications and improvement that the technical solution of utility model is made should all fall into the guarantor that claims of the utility model determine In the range of shield.

Claims (5)

1. a kind of MBUS control circuits for temperature-sensing valve, including being used to that the microcontroller of temperature-sensing valve, MBUS buses to be controlled to connect Rectification circuit (1), the power supply circuit for being used to power to microcontroller being connected with rectification circuit, which is characterized in that the power supply electricity Road includes providing the 6mA constant-current sources (2) of element task electric current to microcontroller and providing high current to microcontroller simultaneously receiving monolithic Machine sends the 20mA controllable constant-currents source of signal（3）And the constant-current control circuit for the receiving host signal being connected with 6mA constant-current sources （9）, the 20mA controllable constant-currents source includes providing the constant-current source I1 of high current with receiving single-chip microcomputer signal and controlling constant-current source I1 Control circuit, the control circuit includes triode Q4 and triode Q6, the base stage of the triode Q4 and connect by resistance R6 The signal that microcontroller is sent is received, the collector of the triode Q4 receives high current by resistance R3 and passes through the hair of triode Q4 Emitter-base bandgap grading is exported to resistance R9, and the resistance R9 is connected with the base stage of triode Q6 and passes through the collector of triode Q6 and exports to electricity R7 is hindered, the resistance R7 is connected with constant-current source I1, and the emitter of the triode Q6 connects simulation ground, and the resistance R9 passes through resistance R10 connects simulation ground, and the constant-current source I1 is connected with rectification circuit.

2. the MBUS control circuits according to claim 1 for temperature-sensing valve, which is characterized in that the power supply circuit also wraps It includes the receiving host signal being connected with 20mA controllable constant-currents source and bus-powered bus-powered control circuit is provided（4）, it is described Bus-powered control circuit includes triode Q5, PMOS tube Q1 and diode D1, the base stage of the triode Q5 pass through resistance R5 receives single-chip microcomputer signal, and the emitter of the triode Q5 connects simulation ground, and the collector of the triode Q5 passes through resistance R4 It connects the G feet of PMOS tube Q1 and passes through resistance R2 and be connected with the S feet of PMOS tube Q1, D feet and the diode D1 of the PMOS tube Q1 Anode connection, the resistance R5 by resistance R8 connect simulation ground.

3. the MBUS control circuits according to claim 1 for temperature-sensing valve, which is characterized in that connected on the microcontroller It is useful for the super capacitor control circuit powered during power-off（8）, the super capacitor control circuit is including passing through super capacitor C14 The capacitor charging circuit and capacitor discharging circuit of connection, the capacitor charging circuit include triode Q17, PMOS tube Q15 and The base stage of diode D15, the triode Q17 are by resistance R37 receiving hosts signal and pass through the collector point of triode Q17 Not Lian Jie resistance R35 and PMOS tube Q15 G feet, the D feet of the PMOS tube Q15 receive 5V voltages by resistance R33 and pass through The S feet of PMOS tube Q15 are exported to diode D15, and the other end of the diode D15 is exported to super capacitor C14, the resistance The D feet of another termination PMOS tube Q15 of R35, the resistance R37 are grounded by the resistance R39 of series connection；The capacitor discharging circuit Including triode Q16 and PMOS tube Q14, the resistance R36 receiving hosts signal and base stage by the triode Q16 passes through Resistance R36 receiving hosts signal simultaneously passes through the collector of triode and exports G feet to resistance R34 and PMOS tube Q14, the PMOS The D feet of pipe Q14 receive the voltage of super capacitor C14 outputs and pass through the S feet output of PMOS tube Q14, and the resistance R36 passes through string The resistance R38 of connection connects simulation ground.

4. the MBUS control circuits according to claim 1 for temperature-sensing valve, which is characterized in that the power supply circuit output Voltage is provided to microcontroller, the DCDC reduction voltage circuits after being converted by DCDC reduction voltage circuits（5）Chip is depressured including DCDC （U2）, the 5th pin of the DCDC decompressions chip（VIN）Connect 6mA constant-current sources, the first pin（BST）It is exported by capacitance C9 To power inductance L1, the other end of the power inductance L1 is exported to filter circuit, second pin（GND）With connecing simulation, the 3rd Pin（FB）It being exported by divider resistance R23 to filter circuit, the divider resistance R23 connects simulation ground by divider resistance R27, 4th pin（EN）The divider resistance R18 being connected with 6mA constant-current sources by diode D12 connections, the divider resistance R18 pass through Divider resistance R28 connects simulation ground, the 4th pin（EN）Simulation ground is connect by capacitance C13.

5. the MBUS control circuits according to claim 1 for temperature-sensing valve, which is characterized in that connect on the rectification circuit It is connected to the receiving circuit that the low and high level that host is sent is switched to the low and high level signal that microcontroller can identify（7）, it is described to connect Receive circuit（7）Pass through resistance R14 and rectified current including diode D8, triode Q10 and triode Q12, the diode D8 Road connects and passes through the emitter of resistance R17 and triode Q10, the collector of the triode Q10 by resistance R24 export to Triode Q12 base stages, the emitter of the triode Q12 connect simulation ground, and the resistance R24 meets simulation ground, institute by resistance R29 The collector for stating triode Q12 receives 3.3V voltages by resistance R26 and is connected with microcontroller and sends data to microcontroller.