CN207638559U - A kind of MBus buses variable pressure difference modulation circuit - Google Patents

Abstract

The utility model provides a kind of MBus buses variable pressure difference modulation circuit, including DC power supply, power control circuit, the voltage modulation circuit that power control circuit is adjusted, the voltage modulation circuit receives pressure difference modulated signal, the DC power supply provides power supply to power control circuit, the power control circuit includes IC chip, the input terminal of IC chip is connect with DC power supply, output end is exported by diode to MBUS buses, so that voltage modulation circuit is adjusted power control circuit by pressure difference modulated signal and provides two different level signals to MBUS buses.The utility model provides the ability of the driving load of high current 3A or more by DC power supply for host MBUS buses, and it is single by voltage modulation circuit to solve the problems, such as that host circuit bus pressure difference is modulated, it designs succinctly, suitable for the application of a variety of slave circuits, the adaptability for improving live host circuit keeps in-site installation and maintenance simple and convenient.

Description

A kind of MBus buses variable pressure difference modulation circuit

Technical field

The utility model belongs to control circuit technical field, and in particular to a kind of MBus buses variable pressure difference modulation circuit.

Background technology

MBUS is a kind of bus protocol designed exclusively for calorimeter remote data transmission at present, it is measuring instrumentss data A kind of transmitting digitized important technology has been widely used for the data acquisition of no source contact such as water, electricity, gas, heat energy meter etc. Occasion, existing MBus host circuits bus pressure difference modulation is single, and the application of a variety of slave circuits is difficult to adapt to so that product is pacified Dress, using by significant limitation, increase the difficulty of in-site installation and maintenance, while also having installation cost of manufacture high, automatic The similar problems such as change degree is insufficient, reaction speed is slow, efficiency is low.

Utility model content

The utility model provides a kind of MBus buses variable voltage modulation circuit, by changing bus pressure difference modulation system solution Certainly host circuit bus pressure difference is modulated the applications of single, a variety of slave circuits and is difficult to adapt to, and in-site installation is asked with difficult in maintenance etc. Topic.

To reach above-mentioned technical purpose, institute's technical solution that uses for,

A kind of MBus buses variable pressure difference modulation circuit, including DC power supply, power control circuit, to power control circuit The voltage modulation circuit being adjusted, the voltage modulation circuit receive pressure difference modulated signal, and the DC power supply is to power supply control Circuit processed provides power supply, and the power control circuit includes IC chip, the 9th leads ends of the IC chip Connect DC power supply, the first leads ends of the IC chip by power inductance L1 export to diode D5 anode simultaneously By the cathode output signal of diode D5, the 6th leads ends of the IC chip are the by voltage follower circuit One leads ends provide low level signal, and the voltage follower circuit includes the intermediate node for being connected to diode D5 and power inductance L1 Resistance R53, export to integrated electricity with the concatenated resistance R54 of resistance R53 and capacitance C35, the resistance R53 and resistance R54 6th leads ends of road chip, the 6th leads ends are grounded by capacitance C35, the other end ground connection of the resistance R54, described Voltage modulation circuit includes resistance R57, triode Q8, resistance R56, and the collector of the triode Q8 is exported by resistance R56 To the 6th leads ends of IC chip, the emitter of the triode Q8 is grounded, the base stage and resistance of the triode Q8 R57 connections, the other end of the resistance R57 receive the pressure difference modulated signal that triode Q8 can be made to be connected.

Further, the DC power supply includes high voltage rail power supply and the first filter circuit, first filter circuit Including capacitance C11, power magnetic bead FB1 and power magnetic bead FB2, capacitance C2 and shunt capacitance C3, affiliated high voltage rail power supply passes through Capacitance C11 exports another in parallel power magnetic bead FB1 and power magnetic bead FB2, the power magnetic bead FB1 and power magnetic bead FB2 One end passes through capacitance C2 and shunt capacitance C3 output voltages in parallel, the capacitance C11, capacitance C2 and power bypass capacitor C3 The other end ground connection.

Further, the power control circuit further include input circuit between DC power supply and IC chip and Bleeder circuit, the input circuit include that capacitance C30, resistance R50, capacitance C29 and capacitance C27, the DC power supply pass through Capacitance C30 and resistance R50 in parallel is exported to the capacitance C29 and capacitance C27, the capacitance C29 and capacitance C27 being connected in parallel It exports to the 9th leads ends of IC chip, the bleeder circuit includes by being exported with the concatenated resistance R52 of resistance R50 To the 8th leads ends of IC chip, the other end of the resistance R52 is grounded.

Further, the power control circuit further includes frequency circuit, stabilizing circuit, start-up circuit, driving circuit, institute It includes resistance R51 to state frequency circuit, and one end ground connection of the resistance R51, the other end, which is exported to the 4th of IC chip the, to be drawn Foot；The stabilizing circuit includes the capacitance C34 being connect with the 5th leads ends of IC chip and is gone here and there with capacitance C34 The other end of the resistance R55, the resistance R55 of connection are grounded；The start-up circuit includes the 7th pin with IC chip Hold the other end ground connection of the capacitance C26, the capacitance C26 of connection；The driving circuit includes second with IC chip First leads ends of the other end connection IC chip of the capacitance C28, the capacitance C28 of leads ends connection.

Further, the power control circuit further includes the second filter circuit, and second filter circuit includes successively Capacitance C31, capacitance C32, capacitance C33, the capacitance C31, capacitance C32, the one end the capacitance C33 connection power inductance being connected in parallel L1, the other end connect the anode of diode D5.

The beneficial effects of the utility model：1, DC power supply provided for host MBUS buses high current 3A or more driving it is negative The ability of load, power magnetic bead, capacitance make it be filtered and energy storage, a good robustness are provided for system；2, electricity is integrated The working frequency of U4 can be arranged in 4th ends leads ends FSW of road chip U4 settings by resistance；The 5th leads ends being arranged The ends COMP can improve the work stable state of U4 by resistance；The 7th ends leads ends SS being arranged can be by resistance capacity size control U4 soft-start times processed；3, the conducting situation that pressure difference modulated signal controls triode Q8, three poles are received by voltage modulation circuit U4 output resistances are 0.8* (1+R53/ (R54//R56)) in the case of pipe Q8 conductings, and U4 output resistances are when triode Q8 ends 0.8* (1+R53/R54) controls two grades of voltage outputs by MCU_VM pressure difference modulated signals, meets two kinds of pressure difference tune of bus System, this circuit design is succinct, effectively improves the adaptability of circuit, and bus driver load capacity reaches 4A electric currents or more.

Description of the drawings

Fig. 1 is the circuit diagram of the utility model power control circuit；

Fig. 2 is the circuit diagram of the utility model DC power supply；

Fig. 3 is the circuit flow graph of the utility model；

In figure：1, the first filter circuit；2, power control circuit；3, voltage modulation circuit.

Specific implementation mode

Electricity is modulated to MBus buses variable pressure difference provided by the utility model below in conjunction with whole attached drawing and specific embodiment Road is described in further detail.

As shown in figure 3, used MBus buses variable pressure difference modulation circuit includes DC power supply, power control circuit 2, electricity Modulation circuit 3 is pressed, as shown in Fig. 2, the DC power supply is high voltage rail power supply and the first filter circuit 1, with 33V 3A high Pressure rail power supply is connected to capacitance C2 and shunt capacitance C3, capacitance C2 and side through capacitance C11 and power magnetic bead FB1, power magnetic bead FB2 Road capacitance C3 is connected and output voltage, another termination reference ground of wherein capacitance C11, capacitance C2 and shunt capacitance C3, this circuit The ability of the driving load of high current 3A or more is provided for host MBUS buses, power magnetic bead, capacitance make it be filtered and store up It can act on, a good robustness is provided for system.

As shown in Figure 1, power control circuit 2 is lower voltage rail power supply output control circuit, including input circuit, partial pressure electricity Road, frequency circuit, stabilizing circuit, start-up circuit, driving circuit and voltage follower circuit, the input circuit are by high electricity Rail power output end voltage 33V is pressed to collect through capacitance C30, divider resistance R50, resistance R52, shunt capacitance C29, capacitance C27 connections At the 9th leads ends VIN of circuit chip U4, the input terminal as power control circuit；The bleeder circuit is divider resistance R50, resistance R52 the other end divide to the 8th leads ends EN of IC chip U4, start as IC chip U4 Enabled foot；The frequency circuit is that the 4th leads ends FSW of IC chip U4 connects the work of reference ground piece U4 through resistance R51 Working frequency passes through the resistance value adjustment setting IC chip U4 working frequencies to resistance R51, another termination references of resistance R51 Ground；The stabilizing circuit is that ic core is connect by capacitance C34 with capacitance R55 at the third ends leads ends COMP of U4, electricity Another termination reference ground for hindering R55, as the stable state for improving IC chip U4 work；The start-up circuit is integrated circuit The 7th ends leads ends SS of chip U4 connect reference ground through capacitance C26, as IC chip U4 soft-start times, pass through setting The amount of capacity of capacitance C26 controls soft-start time；The second pin end BST that the driving circuit is IC chip U4 is passed through Capacitance C28 is connected to the first leads ends LX of U4, the switch drive as IC chip U4；The power control circuit Output is used as output end by power inductance L1 by the first ends leads ends LX of IC chip U4, respectively with capacitance C31, capacitance C32, capacitance C33, resistance R53 are exported to the anode of diode D5, capacitance C31, capacitance C32, capacitance C33 it is another End connects reference ground respectively, and the cathode output of diode D5 is exported through self-recovery fuse F1 to MBUS buses；The voltage is defeated It is that the resistance R53 other ends connect resistance R54 and shunt capacitance C53 and export to the 6th pin of IC chip U4 to go out circuit FB, resistance R54 and the capacitance C35 other ends is held to be grounded respectively, the voltage by the first leads ends LX of IC chip U4 is defeated Go out and provide low level signal for MBUS buses, and 4A load driving currents are provided, effectively improves bus remote power feeding driving capability.

Voltage modulation circuit 3 as shown in Figure 1 receives MCU_VM pressure difference modulated signals, through resistance R57 to the base of triode Q8 Pole, triode Q8 emitters connect reference ground, sixth pin of the collector through resistance R56 Yu IC chip U4 of triode Q8 FB connections are held, when MCU_VM pressure difference modulated signal signals export high level, triode Q8 conductings, resistance R56 passes through triode Q8 conducting ground connection, IC chip U4 output voltages are 0.8* (1+R53/ (R54//R56))；When the output of MCU_VM signals is low When level, triode Q8 cut-offs, resistance R56 is breaking over the ground, and IC chip U4 output voltages are 0.8* (1+R53/R54), IC chip U4 voltage outputs are bus MBUS low levels, and it is defeated to control two grades of voltages by MCU_VM pressure difference modulated signals Go out, meets two kinds of pressure difference modulation of bus, reach 4A electric currents or more for bus driver load capacity.

Embodiment described above is only that preferred embodiments of the present invention are described, not to this practicality Novel range is defined, and under the premise of not departing from the spirit of the design of the utility model, 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 It protects in range.

Claims (5)

1. a kind of MBus buses variable pressure difference modulation circuit, which is characterized in that including DC power supply (1), power control circuit (2), the voltage modulation circuit (3) that power control circuit is adjusted, the voltage modulation circuit receive pressure difference modulated signal, The DC power supply provides power supply to power control circuit, and the power control circuit includes IC chip (U4), described 9th leads ends (VIN) of IC chip (U4) connect DC power supply, the first leads ends of the IC chip (LX) it is exported to the anode of diode D5 by power inductance L1 and by the cathode output signal of diode D5, the integrated electricity 6th leads ends (FB) of road chip are that the first leads ends (LX) provide low level signal, the voltage by voltage follower circuit Output circuit includes the resistance R53 and the concatenated resistance of resistance R53 for the intermediate node for being connected to diode D5 and power inductance L1 R54 and capacitance C35, the resistance R53 and resistance R54 are exported to the 6th leads ends (FB) of IC chip (U4), institute It states the 6th leads ends (FB) to be grounded by capacitance C35, the other end ground connection of the resistance R54, the voltage modulation circuit includes Resistance R57, triode Q8, resistance R56, the collector of the triode Q8 are exported by resistance R56 to IC chip (U4) the 6th leads ends (FB), the emitter ground connection of the triode Q8, base stage and the resistance R57 of the triode Q8 connect It connects, the other end of the resistance R57 receives the pressure difference modulated signal that triode Q8 can be made to be connected.

2. MBus buses variable pressure difference modulation circuit according to claim 1, which is characterized in that the DC power supply includes High voltage rail power supply and the first filter circuit, first filter circuit include capacitance C11, power magnetic bead FB1 and power magnetic bead FB2, capacitance C2 and shunt capacitance C3, affiliated high voltage rail power supply are exported by capacitance C11 to power magnetic bead FB1 and work(in parallel The other end of rate magnetic bead FB2, the power magnetic bead FB1 and power magnetic bead FB2 are defeated by capacitance C2 and shunt capacitance C3 in parallel Go out voltage, the other end ground connection of the capacitance C11, capacitance C2 and power bypass capacitor C3.

3. MBus buses variable pressure difference modulation circuit according to claim 1, which is characterized in that the power control circuit Further include the input circuit and bleeder circuit between DC power supply and IC chip (U4), the input circuit includes capacitance C30, resistance R50, capacitance C29 and capacitance C27, the DC power supply by parallel capacitance C30 and resistance R50 export to The capacitance C29 and capacitance C27, the capacitance C29 and capacitance C27 being connected in parallel are exported to the 9th of IC chip (U4) the and are drawn Foot (VIN), the bleeder circuit include by being exported to IC chip (U4) with the concatenated resistance R52 of resistance R50 8th leads ends (EN), the other end ground connection of the resistance R52.

4. MBus buses variable pressure difference modulation circuit according to claim 1, which is characterized in that the power control circuit Further include frequency circuit, stabilizing circuit, start-up circuit, driving circuit, the frequency circuit includes resistance R51, the resistance R51 One end ground connection, the other end exports to the 4th leads ends (FSW) of IC chip (U4)；The stabilizing circuit includes and collection At circuit chip (U4) the 5th leads ends (COMP) connect capacitance C34 and with the concatenated resistance R55 of capacitance C34, it is described The other end of resistance R55 is grounded；The start-up circuit includes being connect with the 7th leads ends (SS) of IC chip (U4) The other end of capacitance C26, the capacitance C26 are grounded；The driving circuit includes the second pin with IC chip (U4) Hold the first leads ends (LX) of the other end connection IC chip (U4) of the capacitance C28, the capacitance C28 of (BST) connection.

5. MBus buses variable pressure difference modulation circuit according to claim 1, which is characterized in that the power control circuit Further include the second filter circuit, second filter circuit includes the capacitance C31, capacitance C32, capacitance C33 being connected in parallel successively, The capacitance C31, capacitance C32, the one end capacitance C33 connect power inductance L1, and the other end connects the anode of diode D5.