阅读说明：本技术 基于电机状态诊断系统的多路综合供电电源系统 (Multi-path comprehensive power supply system based on motor state diagnosis system ) 是由 陈威宁 张泽忠 苏俭博 陈其伟 秦小龙 田慕琴 于 2021-09-23 设计创作，主要内容包括：本发明公开了基于电机状态诊断系统的多路综合供电电源系统,应用于电源管理技术领域,包括：电源端、AD/DC电源母板、第一直流电源端口、第二直流电源端口、第三直流电源端口、信号调理模块组、电涡流位移传感器供电端口、传感/通信供电端口、DSP核心板供电端口、GND1、CR/CC/CV电池充电模块、第四直流电源端口、内置12V电池供电端口和GND2。本发明实现了取电的高度灵活性,又可满足多数应用场景下的电机状态智能诊断系统的供电需求；采用母板+板载模块的设计结构,可自由选配所需的模块数量和参数,方便灵活,且具备较强的输入和输出电压兼容性。(The invention discloses a multi-path comprehensive power supply system based on a motor state diagnosis system, which is applied to the technical field of power management and comprises the following components: the device comprises a power supply end, an AD/DC power supply mother board, a first DC power supply port, a second DC power supply port, a third DC power supply port, a signal conditioning module group, an eddy current displacement sensor power supply port, a sensing/communication power supply port, a DSP core board power supply port, GND1, a CR/CC/CV battery charging module, a fourth DC power supply port, a built-in 12V battery power supply port and GND 2. The invention realizes high flexibility of power taking and can meet the power supply requirement of the motor state intelligent diagnosis system in most application scenes; the design structure of the motherboard and the onboard module is adopted, the required module quantity and parameters can be freely selected and matched, the operation is convenient and flexible, and the high input and output voltage compatibility is realized.)

1. Multichannel comprehensive power supply system based on motor state diagnostic system, its characterized in that includes: the system comprises a power supply end, an AD/DC power supply mother board, a first DC power supply port, a second DC power supply port, a third DC power supply port, a signal conditioning module group, an eddy current displacement sensor power supply port, a sensing/communication power supply port, a DSP core board power supply port, GND1, a CR/CC/CV battery charging module, a fourth DC power supply port, a built-in 12V battery power supply port and GND 2;

the AD/DC power supply motherboard is connected with the power supply end and used for generating three paths of voltage-stabilized direct-current power supplies;

the first direct-current power port is connected with a first output end of the AD/DC power motherboard and used for outputting a first path of voltage-stabilizing direct-current power supply;

the input end of the signal conditioning module group, the input end of the power supply port of the eddy current displacement sensor and the output end of the first direct current power port share an endpoint;

the second direct current power supply port is connected with a second output end of the AD/DC power supply motherboard and used for outputting a second path of voltage-stabilizing direct current power supply;

the sensing/communication power supply port is connected with the output end of the second direct current power supply port and used for supplying power to the sensor and the communication module;

the third direct-current power supply port is connected with a third output end of the AD/DC power supply motherboard and used for outputting a third path of voltage-stabilized direct-current power supply;

the DSP core board power supply port is connected with the output end of the third direct current power supply port and used for supplying power to the DSP core board;

the GND1 is connected with a fourth output end of the AD/DC power supply motherboard and used for providing a first grounding signal;

the first input end of the CR/CC/CV battery charging module is connected with the third output end of the AD/DC power supply mother board, the second input end of the CR/CC/CV battery charging module is connected with the fourth output end of the AD/DC power supply mother board, and the CR/CC/CV battery charging module charges a built-in lithium battery in a constant-resistance/constant-current/constant-voltage three-stage mode;

the fourth direct-current power supply port is connected with the output end of the fourth direct-current power supply and used for generating a fourth path of voltage-stabilizing direct-current power supply;

the built-in 12V battery power supply port is connected with the output end of the fourth direct current power supply port and used for supplying power to a built-in 12V battery;

and the GND2 is connected with a second output end of the CR/CC/CV battery charging module and used for providing a second grounding signal.

2. The multiple integrated power supply system based on the motor state diagnosis system according to claim 1,

the signal conditioning module group comprises 6 signal conditioning modules, and the output end of each signal conditioning module is correspondingly provided with an acceleration sensor power supply port and an acceleration signal conditioning port;

the signal conditioning module is used for supplying power and conditioning signals to the external acceleration sensor;

the acceleration sensor power supply port is used for supplying power to the acceleration sensor;

and the acceleration signal conditioning port is used for the acceleration sensor to access and output the acceleration sensor conditioning signal.

3. The multiple integrated power supply system based on the motor state diagnosis system according to claim 2,

and the signal conditioning module detects the disconnection and short-circuit faults of the acceleration sensor.

4. The multiple integrated power supply system based on the motor state diagnosis system according to claim 2,

the signal conditioning module has a 24V under-voltage detection function.

5. The multiple integrated power supply system based on the motor state diagnosis system according to claim 1,

the power supply end is 220VAC or 380VAC or 660VAC around the motor.

6. The multiple integrated power supply system based on the motor state diagnosis system according to claim 1,

the first path of voltage-stabilizing direct-current power supply is 24V/150 mA;

the second path of voltage-stabilizing direct-current power supply is 5V/1A;

and the third path of voltage-stabilizing direct-current power supply is 12V/3A.

7. The multiple integrated power supply system based on the motor state diagnosis system according to claim 1,

and the fourth path of voltage-stabilizing direct-current power supply is 12V/2A.

8. The multiple integrated power supply system based on the motor state diagnosis system according to claim 1,

the sensors include a temperature sensor and an ambient humidity sensor.

9. The multiple integrated power supply system based on the motor state diagnosis system according to claim 1,

the communication module comprises one or more of 433 wireless communication, 4G public network communication and WIFI communication.

Technical Field

The invention relates to the technical field of power management, in particular to a multi-path comprehensive power supply system based on a motor state diagnosis system.

Background

At present, various new technologies are developed day by day, and emerging technologies represented by the internet of things, artificial intelligence, 5G, big data, cloud computing and the like are increasingly applied to aspects of production and life. Under the drive of industrial 4.0, various industrial and mining manufacturing centers urgently need to realize the full-life-cycle intelligent diagnosis of the motor so as to realize the early warning and the targeted maintenance of the motor fault, avoid the unnecessary motor fault, save the cost of manpower and material resources and provide basic guarantee for intelligent manufacturing. Therefore, an intelligent diagnosis system based on motor state monitoring cannot be used, a plurality of industrial sensors of different types are arranged in the system, a CPU with certain calculation power cannot be used for supporting, and meanwhile, a free and flexible networking communication function is required. Therefore, the matched power supply is a comprehensive power supply system and needs to simultaneously meet the reliable and stable power supply of each module in the system.

Therefore, a multi-path comprehensive power supply system based on a motor state diagnosis system is provided to overcome the evaluation difficulty in the prior art, which is a problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the invention provides a multi-path comprehensive power supply system based on a motor state diagnosis system, which realizes high flexibility of power taking, can meet the power supply requirements of the motor state intelligent diagnosis system in most application scenes, reserves abundant power supply ports for accessing sensors, and supports access of most sensors.

In order to achieve the purpose, the invention adopts the following technical scheme:

multichannel comprehensive power supply system based on motor state diagnostic system includes: the system comprises a power supply end, an AD/DC power supply mother board, a first DC power supply port, a second DC power supply port, a third DC power supply port, a signal conditioning module group, an eddy current displacement sensor power supply port, a sensing/communication power supply port, a DSP core board power supply port, GND1, a CR/CC/CV battery charging module, a fourth DC power supply port, a built-in 12V battery power supply port and GND 2;

the AD/DC power supply motherboard is connected with the power supply end and used for generating three paths of voltage-stabilized direct-current power supplies;

the first direct-current power port is connected with a first output end of the AD/DC power motherboard and used for outputting a first path of voltage-stabilizing direct-current power supply;

the input end of the signal conditioning module group, the input end of the power supply port of the eddy current displacement sensor and the output end of the first direct current power port share an endpoint;

the second direct current power supply port is connected with a second output end of the AD/DC power supply motherboard and used for outputting a second path of voltage-stabilizing direct current power supply;

the sensing/communication power supply port is connected with the output end of the second direct current power supply port and used for supplying power to the sensor and the communication module;

the third direct-current power supply port is connected with a third output end of the AD/DC power supply motherboard and used for outputting a third path of voltage-stabilized direct-current power supply;

the DSP core board power supply port is connected with the output end of the third direct current power supply port and used for supplying power to the DSP core board;

the GND1 is connected with a fourth output end of the AD/DC power supply motherboard and used for providing a first grounding signal;

the first input end of the CR/CC/CV battery charging module is connected with the third output end of the AD/DC power supply mother board, the second input end of the CR/CC/CV battery charging module is connected with the fourth output end of the AD/DC power supply mother board, and the CR/CC/CV battery charging module is used for charging a built-in lithium battery module;

the fourth direct-current power supply port is connected with the output end of the fourth direct-current power supply and used for generating a fourth path of voltage-stabilizing direct-current power supply;

the built-in 12V battery power supply port is connected with the output end of the fourth direct current power supply port and used for supplying power to a built-in 12V battery;

and the GND2 is connected with a second output end of the CR/CC/CV battery charging module and used for providing a second grounding signal.

Optionally, the signal conditioning module group includes 6 signal conditioning modules, and an output end of each signal conditioning module is correspondingly provided with an acceleration sensor power supply port and an acceleration signal conditioning port;

the signal conditioning module is used for supplying power and conditioning signals to the external acceleration sensor;

the acceleration sensor power supply port is used for supplying power to the acceleration sensor;

and the acceleration signal conditioning port is used for inputting and outputting the acceleration sensor conditioning signal by the acceleration sensor.

Optionally, the signal conditioning module detects disconnection and short-circuit faults of the acceleration sensor.

Optionally, the signal conditioning module has a 24V under-voltage detection function.

Optionally, the power end is 220VAC or 380VAC or 660VAC around the motor.

Optionally, the first path of voltage-stabilized dc power supply is 24V/150 mA;

the second path of voltage-stabilizing direct-current power supply is 5V/1A;

and the third path of voltage-stabilizing direct-current power supply is 12V/3A.

Optionally, the fourth regulated dc power supply is 12V/2A.

Optionally, the sensor comprises a temperature sensor and an ambient humidity sensor.

Optionally, the communication module includes one or more of 433 wireless communication, 4G public network communication, and WIFI communication.

According to the technical scheme, compared with the prior art, the multi-path comprehensive power supply system based on the motor state diagnosis system is compatible with three alternating current power supplies of 220VAC/380VAC/660VAC, 5V/12V/24V voltage-stabilized power supply is provided, high flexibility of power taking is achieved, power supply requirements of the motor state intelligent diagnosis system in most application scenes can be met, abundant power supply ports of the access sensors are reserved, and access of most sensors is supported; the design structure of the motherboard and the onboard module is adopted, the required module quantity and parameters can be freely selected and matched, the operation is convenient and flexible, and the high input and output voltage compatibility is achieved, so that the system not only can be applied to a motor state diagnosis system, but also is suitable for other equipment state detection and diagnosis systems.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a block diagram of a multi-path comprehensive power supply system based on a motor state diagnosis system according to the present invention;

FIG. 2 is a block diagram of a signal conditioning module according to the present invention;

FIG. 3 is a schematic diagram of a 220VAC low voltage version of the present invention;

FIG. 4 is a schematic diagram of a CR/CC/CV lithium battery 3-stage charging module design according to the present invention;

fig. 5 is a schematic diagram of the design of the vibration sensor signal conditioning module of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the invention discloses a multi-path comprehensive power supply system based on a motor state diagnosis system, comprising: the system comprises a power supply end, an AD/DC power supply mother board, a first DC power supply port, a second DC power supply port, a third DC power supply port, a signal conditioning module group, an eddy current displacement sensor power supply port, a sensing/communication power supply port, a DSP core board power supply port, GND1, a CR/CC/CV battery charging module, a fourth DC power supply port, a built-in 12V battery power supply port and GND 2;

the AD/DC power supply mother board is connected with a power supply end and used for generating three paths of voltage-stabilized direct-current power supplies;

the first direct-current power port is connected with the first output end of the AD/DC power motherboard and used for outputting a first path of voltage-stabilized direct-current power supply;

the input end of the signal conditioning module group, the input end of the power supply port of the eddy current displacement sensor and the output end of the first direct current power port share an endpoint;

the second direct current power supply port is connected with the second output end of the AD/DC power supply motherboard and used for outputting a second path of voltage-stabilizing direct current power supply;

the sensing/communication power supply port is connected with the output end of the second direct current power supply port and used for supplying power to the sensor and the communication module;

the third direct-current power supply port is connected with the third output end of the AD/DC power supply motherboard and used for outputting a third path of voltage-stabilized direct-current power supply;

the DSP core board power supply port is connected with the output end of the third direct current power supply port and used for supplying power to the DSP core board;

the GND1 is connected with the fourth output end of the AD/DC power supply mother board and is used for providing a first grounding signal;

the first input end of the CR/CC/CV battery charging module is connected with the third output end of the AD/DC power supply mother board, the second input end of the CR/CC/CV battery charging module is connected with the fourth output end of the AD/DC power supply mother board, and the CR/CC/CV battery charging module is used for charging the built-in lithium battery module;

the fourth direct-current power supply port is connected with the output end of the fourth direct-current power supply and used for generating a fourth path of voltage-stabilizing direct-current power supply;

the built-in 12V battery power supply port is connected with the output end of the fourth direct current power supply port and used for supplying power to the built-in 12V battery;

and the GND2 is connected with the second output end of the CR/CC/CV battery charging module and is used for providing a second grounding signal.

In a specific embodiment, referring to fig. 2, the signal conditioning module group includes 6 signal conditioning modules, and an output end of each signal conditioning module is correspondingly provided with an acceleration sensor power supply port and an acceleration signal conditioning port;

the signal conditioning module is used for supplying power and conditioning signals to the external acceleration sensor;

the acceleration sensor power supply port is used for supplying power to the acceleration sensor;

and the acceleration signal conditioning port is used for inputting and outputting the acceleration sensor conditioning signal by the acceleration sensor.

In a specific embodiment, the signal conditioning module detects disconnection and short-circuit faults of the acceleration sensor; the signal conditioning module has a 24V under-voltage detection function.

In one specific embodiment, the power supply end is 220VAC or 380VAC or 660VAC around the motor; the first path of voltage-stabilizing direct-current power supply is 24V/150 mA; the second path of voltage-stabilizing direct-current power supply is 5V/1A; the third path of voltage-stabilizing direct-current power supply is 12V/3A; the fourth path of voltage-stabilizing direct-current power supply is 12V/2A.

In a particular embodiment, the sensors include a temperature sensor and an ambient humidity sensor; the temperature sensor is an 8-path PT100 temperature sensor; the communication module comprises 433 wireless communication, 4G public network communication, WIFI communication and other communication modes.

In one embodiment, the AC/DC power motherboard includes 3 types: low voltage 220VAC version, high voltage 380VAC and high voltage 660VAC version; referring to fig. 3, a schematic diagram of a low-voltage 220VAC version of the design is shown, the low-voltage 220VAC version of the design adopts a flyback quasi-resonant topology structure, and a circuit mainly comprises the following parts:

AC input rectification filtering: after the AC220V is input, high-voltage direct current is formed through an EMI processing circuit and then through a rectifier bridge and a filter capacitor;

flyback resonant conversion: by means of LC resonance between a primary winding inductance Lp of the transformer and an N-MOS parasitic output capacitor Coss, through a valley bottom detection quasi-resonance technology and matching with reasonable transformer design, the N-MOS tube on the primary side can be switched on under a lower drain-source voltage Vds, namely ZVS-like switching-on is realized, so that the switching loss of the MOS tube is reduced, and the conversion efficiency is improved;

feedback and compensation loops: through reasonable loop gain design, the low-frequency high gain of the closed-loop feedback system before the crossing frequency and necessary phase margin near the crossing frequency are realized, the attenuation of the working frequency and frequency multiplication signal gain above the working frequency is realized, and the better robustness and stability of the whole power supply system are achieved;

output loop voltage stabilization: the main loop realizes voltage stabilization through the closed loop feedback loop and feedforward correction, the auxiliary loop realizes voltage stabilization through the self-contained linear voltage stabilizing circuit, and in order to avoid the common fault of low linear voltage stabilizing efficiency, the input and output voltage difference is reduced to the maximum extent through methods such as transformer winding cross adjustment, voltage pre-stabilization and the like, and further the heating of the linear voltage stabilizing transistor is reduced.

The valley bottom detection quasi-resonance specifically comprises the following steps:

when Q1 is switched on, the primary side current of the transformer T1A linearly rises under the action of input voltage, the diode DS1/DS3 at the secondary side of T1A is judged to bear reverse voltage to be cut off according to the end with the same name, T1A stores energy, meanwhile, the R5/R6 voltage network divides the voltage of the auxiliary winding T1B, the voltage of the auxiliary winding is in direct proportion to the input voltage, the PWM control chip U1 automatically distributes current through an internal current source to keep the voltage on the R6 unchanged at a preset voltage, the current flowing through R5 is collected, when the input voltage is high, the current flowing through R5 is increased, and otherwise, the current is reduced. The primary peak current of the transformer at different input voltages is dynamically adjusted according to the current, so that feedforward control is realized; when Q1 is turned off, a diode DS1/DS3 at the secondary end of T1A bears forward voltage to be conducted, energy stored by T1A is released, after the current of T1A is reduced to 0A, a primary inductor Lp of T1A and an output parasitic capacitor Coss of Q1 start to resonate, in the process of resonating, the voltage of an auxiliary winding of T1B fluctuates along with the voltage at two ends of Lp, a voltage network R5/R6 detects the change of the voltage of the auxiliary winding, and when the voltage resonates to be close to a valley value, a controller U1 drives Q1 to be conducted again to achieve ZVS-like opening.

The specific content of the 5V output loop linear voltage stabilizing technology is as follows:

the 5V output loop is used for getting power from the 12V voltage-stabilizing main loop, a Darlington transistor QS1 is selected as a linear voltage-stabilizing main power device, on one hand, the high amplification factor of the Darlington transistor allows the use of lower base driving current, the base driving current loss is reduced, and further lower power and higher resistance base driving resistors RS1 and RS2 can be selected; on the other hand, the Darlington tube has stronger current carrying capacity and lower conduction internal resistance, can realize the quick response of the 5V loop to the transient heavy current load, and can also greatly reduce the heating of the part of the circuit during the continuous working period. Secondly, a high-precision voltage reference source U3 is selected, the output voltage is sampled through an RS3/RS4 voltage division circuit, the base current of a Darlington tube QS1 is controlled, a feedback loop is formed to realize output voltage stabilization, the voltage stabilization precision of the output 5V voltage is improved, and the overall reliability is improved.

In one embodiment, referring to fig. 4, a schematic diagram of a CR/CC/CV lithium battery 3-stage charging module design is shown, where the conventional PWM control method is adopted, and the method mainly includes the following steps:

d, direct current filtering: through the LC filter circuit, the peak value of input impact current is effectively reduced, the service life of an input filter capacitor is prolonged, and the current impact on an external power supply is reduced;

DC/DC conversion: the control mode of combining flyback CCM and DCM is adopted, and the primary side N-MOS peak current is obviously reduced through reasonable transformer design. A slope compensation circuit is added to prevent the PWM duty ratio from being maladjusted when a high load runs for a long time, and further the magnetic saturation of the transformer is caused to damage a power supply. An overload protection circuit is added, and the PWM signal output is effectively stopped under the condition of circuit overload;

3-stage CC/CV charging control circuit: through voltage and current double feedback control, a necessary control circuit is added to realize 3-stage CR/CC/CV charging control, which specifically comprises the following steps: when the electric quantity of the battery is lower than 9V, the battery may be activated due to long-term power shortage or has faults, and at the moment, a CR (constant resistance) mode is adopted for carrying out low-current trickle charging, and the damage of the battery accelerated by high-current charging is avoided by matching with a proper current-limiting resistor; when the battery voltage is higher than 9V but lower than 12.2V, the charging is carried out by adopting a CC (constant current) mode, and in the charging mode, the charging current is kept to be 2A; when the voltage of the battery reaches 12.2V, the charging mode is switched to CV (constant voltage) charging, the voltage of the battery terminal is basically kept unchanged, and the charging current gradually decreases to be approximately 0A after 12.6V. In the charging process, the LED indicator lamps are arranged, and when the battery is not fully charged, the red LED indicator lamp and the green LED indicator lamp are both lightened; after the battery is fully charged, the red LED indicator lamp is turned off.

The CR/CC/CV implementation method comprises the following steps:

when the lithium battery module is accessed through BAT + and BAT-, a voltage comparator built in a U2 reference voltage source detects a divided voltage sampling voltage formed by R21/R22/C16, if the battery voltage is lower than 9V, the U2 is turned off, then a resistor R25 connected with a grid electrode of a PMOS tube Q5 is cut off to the ground, GS (the grid electrode and a source electrode) keeps the same potential, the Q5 is cut off and cannot be turned on, then Vbat can be switched on only through a current-limiting resistor R20, and the Vbat is stabilized through a feedback network, so that CR constant-resistance mode charging is realized;

when the lithium battery module is higher than 9V, U2 is switched on, PMOS is switched on, at the moment, the charging current flows through an R27 current detection resistor to form a current sampling signal Ibat, the Ibat is input to an inverting terminal 2 pin of an operational amplifier through an impedance matching resistor R41 and is compared with a reference voltage formed by dividing voltage of a 3 pin R39/R40/R40A, then an amplifier 1 pin outputs an error signal, and as the current error signal output by the 1 pin of the operational amplifier U6 is smaller than a voltage error signal output by a 7 pin, a feedback loop is switched to current feedback, namely CC constant current mode charging is realized;

when the voltage of the lithium battery is higher than 12.2V, Vbat is a voltage sampling signal formed by dividing voltage of R34/R34A/R35, the voltage sampling signal is input to the inverting input end of the pin 6 of the operational amplifier and is compared with the 2.5V voltage reference of the non-inverting input end of the pin 5, and the voltage error signal output by the pin 7 of the operational amplifier U6 is smaller than the current error signal output by the pin 1, so that the feedback loop is switched to voltage feedback, namely the CV constant voltage mode charging is realized.

In a specific embodiment, referring to fig. 5, a schematic diagram of a design of a vibration sensor signal conditioning module is shown, and a multi-path voltage comparator is used for indicating a working state, which mainly includes power supply under-voltage fault indication, sensor fault indication and normal operation indication. When the voltage of the input 24V power supply is insufficient, the undervoltage fault indicator lamp is lightened; when the sensor is not connected, open or short-circuited, the fault indicator lamp is turned on; when the module works normally, the running indicator lamp is lightened;

in addition, on one hand, the power is supplied to the external vibration sensor through the high-precision constant current source, on the other hand, the input signal of the vibration sensor is converted through the precision operational amplifier, the input unipolar voltage signal is converted into a bipolar output signal fluctuating around 0V, the frequency of the output signal is consistent with the original input signal of the sensor, the amplitude of the signal is in direct proportion to the vibration acceleration, and free adjustment of 1-10-fold benefits can be achieved through the precision potentiometer.

Fault indication and signal conditioning:

the power supply under-voltage indication uses a U1 group 2 voltage comparator, R1/R2 divides voltage to detect 24V voltage of a power supply, the voltage is input to a 5-pin in-phase input end of the voltage comparator and compared with a voltage reference Vref of a 4-pin out-of-phase input end, when the power supply is normal, a 2-pin output high level of the voltage comparator is obtained, and an LED1 indicator lamp is turned off; when the power supply is under-voltage, the pin 2 of the voltage comparator outputs low level, and the LED1 indicator lamp is lightened;

the sensor access indication uses a U1 group 4 voltage comparator, Vsref 1 collects a constant current source supply voltage signal, Isense collects a sensor current signal, when the sensor is open-circuit or not connected, the Isense voltage of a 11-pin non-inverting input end is close to the supply voltage and higher than Vsref 1 of a 10-pin inverting input end, then a 13-pin of the voltage comparator outputs a high level, and an LED3 running indicator lamp is turned off; when the sensor is switched on, the Isense voltage is lower than Vsref 1, a pin 13 of the voltage comparator outputs a low level, and the LED3 running indicator lamp is turned on.

The sensor fault indication uses 1 st and 3 rd groups of voltage comparators of U1, Vsref 1 collects constant current source supply voltage signals, and Isense collects sensor current signals, wherein the 1 st group of comparators realize open-circuit fault indication, Vsref 1 is connected to a 7-pin non-inverting input end, Isense is connected to a 6-pin inverting input end, when the sensor is open-circuit, the Isense voltage is higher than Vsref 1, further, the 1 pin of the comparator outputs low level, and a fault indicator LED2 is turned on; the 3 rd group of comparators realize short-circuit fault indication, and Isense inserts 9 feet non-inverting input end, and the constant current source supply voltage inserts 8 feet inverting input end through R7/R8 and R9 partial pressure, and when the sensor short circuit, Isense voltage is less than 8 feet voltage, and then 14 feet output low level of comparator, fault indicator LED2 lights.

After the sensor is connected with the Sin + and the Sin-, a voltage signal is input to a 3-pin non-inverting input end of a high-precision operational amplifier U4, when a 3-pin voltage signal rises, a 2-pin inverting input end of a U4 rises along with the 3-pin voltage, then a capacitor C7 is charged through R13, a charging current is generated on R13, since C7 is connected to a 5-pin non-inverting input end of a U4 amplifier, meanwhile, a 6-pin inverting input end voltage follows the voltage change of C7, the voltage on R14/R15 is consistent with the voltage on R13, namely R14/R15 realizes proportional mirroring of the charging current, the current flowing through R16/R16A/R17 is consistent with the current of R14/R15, a voltage signal is formed on 1 pin in proportion, so that the 1-pin output voltage rises, then the 1 pin charges C8 through R18, the R18 voltage is positive and is proportional to the voltage of R13, and the pulse current of the capacitor C8 is converted into pulse current, namely a positive acceleration signal; when the voltage of the 3-pin is reduced, and conversely, the voltage of the R18 is negative, the discharge current of the C8 pulse is converted into voltage, namely a reverse acceleration signal.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention in a progressive manner. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.