CN206003088U - The multi-bus interface circuit of magnetostrictive displacement sensor - Google Patents

Abstract

The utility model discloses a kind of multi-bus interface circuit of magnetostrictive displacement sensor, MCU adopts the ARM Cortex M0 chip NUC130 of 32, multi-bus interface circuit includes RS232 bus interface circuit, RS485 bus interface circuit, CAN interface circuit, powered using the power module of isolation between its bus interface circuit outfan and MCU application system, each bus interface circuit is respectively adopted integrated level height and the complete isolation bus transceiving chip of protective measure realizes the electrical isolation between MCU and each bus interface circuit, the clock source of each bus is provided by the clock oscillator being integrated within MCU, each bus control unit adopts the integrated bus controller within MCU.This utility model can obviously reduce the complexity of circuit system, significantly improves job stability and the reliability of interface circuit.

Description

The multi-bus interface circuit of magnetostrictive displacement sensor

Technical field

This utility model is related to magnetostrictive displacement sensor field, more particularly to a kind of magnetostrictive displacement sensor Multi-bus interface circuit.

Background technology

Magnetostrictive displacement sensor is the sensor developed using magnetostrictive effect, is usually used in the displacement of degree of precision Detection occasion, in industrial circle using widely.Current magnetostrictive displacement sensor externally exports typically with simulation Based on industrial transmission signal, such as 0 5V, 4 20mA etc., or the EBI that external output is single.Analogue signal is in environment Severe industrial applications are easily disturbed by external interference source, cause the fluctuation of analog output signal, interference free performance Not strong.In actual application process, magnetostrictive displacement sensor is mainly used in the data acquisition of live displacement, general feelings Need to enter row data communication and host computer between under condition, and in different application systems, host computer can have multiple choices, such as PLC, PC, intelligent instrumentation etc., these host computers be substantially all have conventional outbound data communication interface such as RS232 or RS485 bus etc., but the external EBI of different host computers is likely to difference, simultaneously in some application systems, such The sensor of type may need to be communicated with multiple host computers simultaneously, and at this moment single data communication interface does not then adapt to this The requirement of class application system.And the core devices within magnetostrictive displacement sensor are generally MCU, can be made full use of such The MCU internal resource of type sensor, using the outbound data interface of multibus, on the one hand can avoid analog output signal in environment The shortcoming of severe industrial occasions interference free performance difference, is on the other hand suitable for the various actual feelings of host computer EBI type Condition, can meet the application scenario that the type sensor is communicated with multiple host computers simultaneously, thus improving its adaptability.

However, in current Bus Interface Circuit Design, in order to improve the job stability of bus and the anti-of MCU system MCU application system and external system are typically carried out electrical isolation, the design one of isolation circuit using isolation circuit by jamming performance As MCU application system and extraneous electrical isolation are realized using conventional isolating device such as photoelectrical coupler etc., simultaneously in interface Protected frequently with the discrete device such as interface circuit such as transient state killer tube, inductive element in the protection of bus, adopted such Although the mode of type electrical isolation and bus interface circuit protection has certain effect, the complexity of its circuit improves, collection One-tenth degree is relatively low, may have a certain degree of impact to the job stability of bus interface circuit.

Therefore needing badly provides a kind of multi-bus interface circuit of new magnetostrictive displacement sensor to solve above-mentioned asking Topic.

Utility model content

Technical problem to be solved in the utility model is the magnetostrictive displacement sensor providing a kind of integrated level high Multi-bus interface circuit, it is possible to increase the job stability of interface circuit and reliability.

For solving above-mentioned technical problem, the technical scheme that this utility model adopts is：A kind of magnetostriction position is provided The multi-bus interface circuit of displacement sensor, magnetostrictive displacement sensor includes MCU module and magnetostrictive displacement sensor letter Number modulate circuit, power module, MCU adopts the ARM Cortex M0 chip NUC130 of 32, and it is internal to include clock oscillation Device, three UART controller, CAN controllers；Multi-bus interface circuit includes RS232 bus interface circuit, RS485 Bus interface circuit, CAN interface circuit, its clock source is provided by the clock oscillator of MCU；RS232 bus interface circuit Including single-chip isolated transceiver ADM3251E, bus control unit adopts a UART controller of MCU；RS485 bus connects Mouth circuit includes half-duplex isolated transceiver ADM2481, and bus control unit adopts a UART controller of MCU；CAN Interface circuit includes isolated CAN transceiver ADM3054, and bus control unit adopts the CAN controller of MCU；Power module Using isolation DC/DC module, respectively MCU module and magnetostrictive displacement sensor signal conditioning circuit, multi-bus interface electricity Road powers.

In one preferred embodiment of this utility model, power module includes DC/DC isolation module power supply U1, LDO direct current Voltage stabilizing chip U2, U3, PWM type DC/DC changer U4, DC/DC isolation module power supply U1 is output as the DC source of 6V；LDO The input of DC voltage-stabilizing chip U2, U3 is in parallel with the outfan of DC/DC isolation module power supply U1, LDO DC voltage-stabilizing chip U2 It is output as 3.3VCC1, LDO DC voltage-stabilizing chip U3 is output as the DC source of 5V；PWM type DC/DC changer U4's is defeated Enter for 12 30VDC, be output as the DC source of 5V.Power module realizes MCU module using isolation DC/DC module and mangneto is stretched Condense the signal conditioning circuit of displacement sensor and the isolated from power of multi-bus interface circuit.

Further, the output electricity of the out-put supply of DC/DC isolation module power supply U1 and LDO DC voltage-stabilizing chip U2, U3 Source is connected with MCU module and magnetostrictive displacement sensor signal conditioning circuit；The out-put supply of LDO DC voltage-stabilizing chip U2 is also It is connected with the input of multi-bus interface circuit, the out-put supply of PWM type DC/DC changer U4 is defeated with multi-bus interface circuit Go out end to be connected.

The beneficial effects of the utility model are：All kinds of bus control units and height that this utility model is internally integrated using MCU Precision low drifting clock oscillator, realizes the conditioning electricity of MCU module and magnetostrictive displacement sensor using isolation DC/DC module Road and the isolated from power of multi-bus interface circuit, each bus interface circuit is respectively adopted the isolation type bus transmitting-receiving of high integration Data isolation realized by device, can obviously reduce the complexity of circuit system, significantly improve interface circuit job stability and can By property.

Brief description

Fig. 1 is the theory diagram of the multi-bus interface circuit of this utility model magnetostrictive displacement sensor；

Fig. 2 is the circuit diagram of described power module；

Fig. 3 is the circuit diagram of described MCU module；

Fig. 4 is the circuit diagram of described RS232 bus interface circuit；

Fig. 5 is the circuit diagram of described RS485 bus interface circuit；

Fig. 6 is the circuit diagram of described CAN interface circuit.

Specific embodiment

Below in conjunction with the accompanying drawings preferred embodiment of the present utility model is described in detail, so that advantage of the present utility model Can be easier to be readily appreciated by one skilled in the art with feature, thus make apparent clear and definite to protection domain of the present utility model Define.

Refer to Fig. 1, this utility model embodiment includes：

A kind of multi-bus interface circuit of magnetostrictive displacement sensor, magnetostrictive displacement sensor includes MCU module And magnetostrictive displacement sensor signal conditioning circuit, power module, using money inside the MCU in magnetostrictive displacement sensor Source, builds the data-interface of multibus, and interface comprises conventional RS232 bus, RS485 bus and CAN.In conjunction with Fig. 3, MCU adopt 32 microcontroller NUC130 based on ARM Cortex M0 core, its be internally integrated high-precision low-drift when Clock agitator, can provide stable clock source for each bus, and contain three UART controller, a CAN controller, Internal resource is very abundant.For improving job stability and the anti-interference of MCU application system and each bus interface circuit, bus Powered using the power module of isolation between interface circuit outfan and MCU application system, each bus interface circuit is adopted respectively With integrated level is high and the complete isolation bus transceiving chip of protective measure realize between MCU and each bus interface circuit electric every From the clock source of each bus is provided by the high-precision low-drift clock oscillator being integrated within MCU, and each bus control unit adopts Integrated bus controller within MCU.

The each modular circuit structure of the multi-bus interface circuit of described magnetostrictive displacement sensor is detailed below：

Refer to Fig. 2, the DC source that the power module of magnetostrictive displacement sensor is powered as 12 30V, respectively MCU module and magnetostrictive displacement sensor signal conditioning circuit, multi-bus interface circuit are powered, and power module is using isolation DC/DC module realizes MCU module and the signal conditioning circuit of magnetostrictive displacement sensor and the power supply of multi-bus interface circuit Isolation, it includes DC/DC isolation module power supply U1, LDO DC voltage-stabilizing chip U2, U3, PWM type DC/DC changer U4.U1 is fixed The small size DC/DC isolation module power supply of system, power is 10W, the Width funtion input of 9 36V, is output as direct current 6V, is mangneto Waveguide filament in the signal conditioning circuit of telescopic displacement sensor provides excitation power supply；The input of LDO DC voltage-stabilizing chip U2, U3 End is in parallel with the outfan of DC/DC isolation module power supply U1, and LDO DC voltage-stabilizing chip U2 is output as 3.3VCC1, is that mangneto is stretched Condense the supplying power for input end of the MCU within displacement sensor, the timing circuit in signal conditioning circuit and multi-bus interface circuit； LDO DC voltage-stabilizing chip U3 is output as the DC source (in figure is denoted as 5V1) of 5V, is the torsion in signal conditioning circuit Ripple echo detecting circuit is powered；The input of PWM type DC/DC changer U4 is 24VDC, is output as DC source (the in figure mark of 5V It is shown as 5V2)；Power for each EBI circuit of output terminal, TPS5420 is provided that the load current of 2A, its conversion efficiency up to 95%, encapsulated using SOIC 8, be provided simultaneously with the functions such as Thermal protection, overload protection.D1 is counnter attack diode, and D2 is Schottky Diode, D2 and L1, C5, C17 C19 and R1 R2 cooperation can obtain stable 5V DC source output.

Refer to Fig. 4, RS232 bus interface circuit by single-chip isolated transceiver ADM3251E realize interface circuit with Completely isolated between MCU, its message transmission rate reaches as high as 460kbps, and have complete protective measure such as Tout and Rin and the protection of power supply short circuit, ESD protection etc..RS232 bus control unit adopts the UART0 controller within MCU, by isolation Type transceiving chip ADM3251E realizes data isolation, and its TTL logic level end and RS232 logic level end are respectively with isolation 3.3VCC1 and 5V2 powers.R3 R4 is the energy absorption resistance of low ohm resistance, for during bus data transfer due to signal Reflect issuable energy absorption.

Refer to Fig. 5, RS485 bus interface circuit adopts half-duplex isolated transceiver ADM2481, its highest transmission speed Rate is up to 500kbps, it is possible to provide up to 256 standards RS485 loads, have instantaneously go up electricity and power-off protection, Thermal shutdown protection, Short-circuit protection and ESD protection etc..RS485 bus control unit adopts the UART1 controller within MCU, receives and dispatches core from isolated form Piece half-duplex ADM2481 realizes data isolation, and its TTL logic level end and RS485 logic level end are respectively with isolation 3.3VCC1 and 5V2 powers.The data transfer direction of RS485 controls and is controlled by the PA8 pin of MCU.R6 and R7 is respectively upper drop-down Resistance, R5 is terminal coupling resistance.

Refer to Fig. 6, CAN interface circuit selects isolated CAN transceiver ADM3054, and its message transmission rate is Height, up to 1Mbps, can support up to 110 and above node, and the output of its bus is integrated with defencive function, bus can be prevented short It is connected to the power supply in system power supply and ground, and possess the defencive functions such as Thermal shutdown, the anti-interference, ESD of high common mode transient.CAN Controller adopts the CAN controller within MCU, realizes data isolation using isolated form transceiving chip ADM3054, its TTL logic Level terminal and RS485 logic level end are powered with 3.3VCC1 and 5V2 of isolation respectively, R8 and R9 and C32 is used for improving interface electricity The EMI performance on road.

All kinds of bus control units and high-precision low-drift clock oscillator that this utility model is internally integrated using MCU, knot Close the high each bus single-chip isolation solution of integrated level, can obviously reduce the complexity of circuit system, significantly improve and connect The job stability of mouth circuit and reliability.

The foregoing is only embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model, every The equivalent structure made using this utility model description and accompanying drawing content or equivalent flow conversion, or be directly or indirectly used in Other related technical fields, are all included in the same manner in scope of patent protection of the present utility model.

Claims (3)

1. the multi-bus interface circuit of a kind of magnetostrictive displacement sensor, magnetostrictive displacement sensor include MCU module and Magnetostrictive displacement sensor signal conditioning circuit, power module are it is characterised in that MCU adopts the ARM Cortex of 32 M0 chip NUC130, its internal inclusion clock oscillator, three UART controller, CAN controllers；Multi-bus interface Circuit includes RS232 bus interface circuit, RS485 bus interface circuit, CAN interface circuit, its clock source by MCU when Clock agitator provides；RS232 bus interface circuit includes single-chip isolated transceiver ADM3251E, and bus control unit adopts One UART controller of MCU；RS485 bus interface circuit includes half-duplex isolated transceiver ADM2481, bus control unit A UART controller using MCU；CAN interface circuit includes isolated CAN transceiver ADM3054, bus control unit CAN controller using MCU；Power module is using isolation DC/DC module, respectively MCU module and magnetostrictive displacement Sensor signal conditioning circuit, multi-bus interface circuit are powered.

2. the multi-bus interface circuit of magnetostrictive displacement sensor according to claim 1 is it is characterised in that power supply mould Block includes DC/DC isolation module power supply U1, LDO DC voltage-stabilizing chip U2, U3, PWM type DC/DC changer U4, DC/DC isolation mode Block power supply U1 is output as the DC source of 6V；The input of LDO DC voltage-stabilizing chip U2, U3 and DC/DC isolation module power supply The outfan of U1 is in parallel, and LDO DC voltage-stabilizing chip U2 is output as 3.3VCC1, and LDO DC voltage-stabilizing chip U3 is output as 5V's DC source；The input of PWM type DC/DC changer U4 is 12 30VDC, is output as the DC source of 5V.

3. the multi-bus interface circuit of magnetostrictive displacement sensor according to claim 2 is it is characterised in that DC/DC The out-put supply of the out-put supply of isolation module power supply U1 and LDO DC voltage-stabilizing chip U2, U3 and MCU module and magnetostriction position Displacement sensor signal conditioning circuit is connected；The input also with multi-bus interface circuit for the out-put supply of LDO DC voltage-stabilizing chip U2 End is connected, and the out-put supply of PWM type DC/DC changer U4 is connected with the outfan of multi-bus interface circuit.