WO2022262746A1

WO2022262746A1 - Electromagnet current measurement circuit for magnetic-levitation train, and magnetic-levitation train

Info

Publication number: WO2022262746A1
Application number: PCT/CN2022/098823
Authority: WO
Inventors: 江守亮; 苗欣; 韩纪昱; 陈健; 顾绍鹏
Original assignee: 中车青岛四方机车车辆股份有限公司
Priority date: 2021-06-15
Filing date: 2022-06-15
Publication date: 2022-12-22
Also published as: CN113406378A

Abstract

An electromagnet current measurement circuit for a magnetic-levitation train, and a magnetic-levitation train. The circuit comprises: a forward circuit (10), a reverse circuit (20) and a comparison circuit (30), wherein the forward circuit (10) is used for performing positive-value taking processing on an input first analog signal, and outputting a first signal; the reverse circuit (20) is used for performing negative-value taking processing on an input second analog signal, and outputting a second signal, the first analog signal being an electromagnet input current and the second analog signal being an electromagnet output current, or the first analog signal being an electromagnet output current and the second analog signal being an electromagnet input current; and the comparison circuit (30) is used for determining, when the sum of the first signal and the second signal is within a preset signal threshold value range, that the electromagnet input current and the electromagnet output current are normal.

Description

Electromagnet current detection circuit for maglev train and maglev train

This application claims the priority of the Chinese patent application submitted to the State Intellectual Property Office of China on June 15, 2021, the application number is 202110661597.4, and the invention title is "A Magnetic Levitation Train Electromagnet Current Detection Circuit and Maglev Train", the entire content of which Incorporated in this application by reference.

technical field

The invention belongs to the technical field of trains, and in particular relates to an electromagnet current detection circuit for a maglev train and the maglev train.

Background technique

An electromagnet is arranged on the support arm of the maglev train, and a linear motor stator is arranged horizontally on the relative position of the track. The control system controls the magnitude and direction of the levitation force and traction force by controlling the magnitude and direction of the current of the electromagnet and the stator coil of the linear motor, and then makes the maglev train run in the air.

Generally, the inconsistency between the current flowing into the electromagnet and the current flowing out of the electromagnet is regarded as an abnormal situation, and this abnormal situation will cause train safety problems such as unstable operation of the maglev train. Therefore, to require the current to flow through the electromagnet normally, it is necessary to detect the current flowing into the electromagnet and the current flowing out of the electromagnet.

At present, after collecting the electromagnet current, it is detected whether the electromagnet current is normal through the form of software. However, the failure rate of general software detection is high and the reliability of detection results is low.

Contents of the invention

In order to solve the above technical problems, the present application provides a magnetic levitation train electromagnet current detection circuit and the magnetic levitation train, which are used to accurately detect the reliability of the current of the magnetic levitation train.

In order to achieve the above objectives, the technical solutions provided in the embodiments of the present application are as follows:

An embodiment of the present application provides an electromagnet current detection circuit for a maglev train, wherein the circuit includes: a forward circuit, a reverse circuit and a comparison circuit;

The forward circuit is used to perform positive value processing on the input first analog signal, and output the first signal;

The inverting circuit is used for inverting the input second analog signal and outputting the second signal;

Wherein, the first analog signal is the electromagnet input current, and the second analog signal is the electromagnet output current, or, the first analog signal is the electromagnet output current, and the second analog signal is the electromagnet output current. The electromagnet input current;

The comparison circuit is used to determine that the electromagnet input current and the electromagnet output current are normal when the sum of the first signal and the second signal is within a preset signal threshold range.

Optionally, the forward circuit includes a first operational amplifier;

The first analog signal is input to the positive input terminal of the first operational amplifier; the negative input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier; the output of the first operational amplifier output the first signal.

Optionally, the reverse circuit includes a second operational amplifier;

The second analog signal is input to the inverting input terminal of the second operational amplifier; the positive input terminal of the second operational amplifier is grounded; the inverting input terminal of the second operational amplifier passes through the first resistor and the The output terminal of the second operational amplifier is connected; the output terminal of the second operational amplifier outputs the second signal;

The output terminal of the first operational amplifier is connected to the output terminal of the second operational amplifier and then connected to the positive input terminal of the comparison circuit; the negative input terminal of the comparison circuit inputs the preset signal threshold range ; The output terminal of the first operational amplifier is connected to the output terminal of the second operational amplifier for obtaining the sum of the first signal and the second signal.

Optionally, the circuit also includes: a threshold generating circuit;

The threshold generation circuit is used to generate a target clock signal through an input clock signal; the threshold range of the target clock signal is the preset signal threshold range; the comparison circuit is used to compare the preset signal threshold range with the preset signal threshold range The sum of the first signal and the second signal.

Optionally, the threshold generating circuit includes a second resistor, a third resistor, and a fourth resistor; the resistance values of the third resistor and the fourth resistor are the same;

One end of the second resistor is connected to the input clock signal; the other end of the second resistor, one end of the third resistor and one end of the fourth resistor are connected to the reverse input of the comparison circuit end, the other end of the second resistor, one end of the third resistor and one end of the fourth resistor are connected to obtain the target clock signal; the other end of the third resistor is connected to the negative pole of the power supply; The other end of the fourth resistor is connected to the positive pole of the power supply.

Optionally, the comparison circuit includes a voltage comparator and a triode;

The positive input terminal of the voltage comparator is used to input the sum of the first signal and the second signal; the negative input terminal of the voltage comparator is used to input the target clock signal; the voltage comparison The output terminal of the device is connected to the base of the triode;

When the sum of the first signal and the second signal is within the preset signal threshold range, the emitter of the triode outputs an output clock signal with the same frequency as the input clock signal, and determines that the electromagnet The input circuit and the output current of the electromagnet are normal.

Optionally, when the sum of the first signal and the second signal exceeds the preset signal threshold range, the emitter of the transistor outputs a normally high level or a normally low level to determine the The electromagnet input current and the electromagnet output current are abnormal.

Optionally, the circuit further includes: a first signal filter circuit and a second signal filter circuit; the first signal filter circuit includes a first capacitor and a fifth resistor; the second signal filter circuit includes a second capacitor and A sixth resistor; the first capacitor has the same capacitance as the second capacitor, and the fifth resistor has the same resistance as the sixth resistor;

One end of the fifth resistor is connected to the output end of the first operational amplifier; the other end of the fifth resistor and one end of the first capacitor are connected to a first connection point, and the first connection point outputs the filter After the first signal; the other end of the first capacitor is connected to the positive pole of the power supply;

One end of the sixth resistor is connected to the output end of the second operational amplifier; the other end of the sixth resistor and one end of the second capacitor are connected to a second connection point, and the second connection point outputs the filter After the second signal; the other end of the second capacitor is connected to the negative pole of the power supply;

The first connection point is connected to the second connection point and then connected to the positive input terminal of the voltage comparator, and the first connection point is connected to the second connection point to obtain the filtered The sum of the first signal and the filtered second signal.

Optionally, the circuit further includes: a third signal filter circuit; the third signal filter circuit includes a third capacitor;

One terminal of the third capacitor is connected to the positive input terminal of the voltage comparator; the other terminal of the third capacitor is connected to the negative input terminal of the voltage comparator.

An embodiment of the present application also provides a maglev train, the maglev train comprising the aforementioned electromagnet current detection circuit for the maglev train.

It can be seen from the above technical scheme that the present application has the following beneficial effects:

The embodiment of the present application provides an electromagnet current detection circuit for a maglev train and the maglev train. The circuit includes: a forward circuit, a reverse circuit and a comparison circuit. Wherein, the forward circuit is used for performing positive value processing on the input first analog signal, and outputting the first signal. The reverse circuit is used for inverting the input second analog signal and outputting the second signal. Wherein, the first analog signal is the input current of the electromagnet, and the second analog signal is the output current of the electromagnet, or, the first analog signal is the output current of the electromagnet, and the second analog signal is the input current of the electromagnet. The comparison circuit is used to determine that the electromagnet input current and the electromagnet output current are normal when the sum of the first signal and the second signal is within the preset signal threshold range. Through the detection form of the hardware circuit, it can accurately detect whether the input current and output current of the electromagnet of the maglev train are consistent, and then determine whether the electromagnet current is reliable.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is the structural representation of a kind of maglev train electromagnet current detection circuit that the embodiment of the application provides;

Fig. 2 is the structural representation of another kind of maglev train electromagnet current detection circuit that the embodiment of the application provides;

Fig. 3 is the structural representation of another kind of maglev train electromagnet current detection circuit that the embodiment of the application provides;

FIG. 4 is a schematic diagram of a specific circuit structure of an electromagnet current detection circuit for a maglev train provided in an embodiment of the present application.

detailed description

In order to make the above objects, features and advantages of the present application more obvious and understandable, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of an electromagnet current detection circuit for a maglev train provided in an embodiment of the present application. As shown in FIG. 1 , the electromagnet current detection circuit of the maglev train includes a forward circuit 10 , a reverse circuit 20 and a comparison circuit 30 .

The first analog signal is input to the forward circuit 10, and the forward circuit 10 performs positive value processing on the input first analog signal, and then outputs the first signal.

The second analog signal is input to the reverse circuit 20, and the reverse circuit 20 performs inversion processing on the input second analog signal, and then outputs the second signal.

Wherein, the first analog signal is the input current of the electromagnet, and the second analog signal is the output current of the electromagnet, or, the first analog signal is the output current of the electromagnet, and the second analog signal is the input current of the electromagnet. As an example, both the first signal and the second signal are voltage signals.

As an example, the forward circuit 10 includes a first operational amplifier.

As an example, the inverting circuit 20 includes a second operational amplifier.

After the first signal and the second signal are obtained, the sum of the first signal and the second signal is further obtained. The comparison circuit 30 is used to determine the relationship between the sum of the first signal and the second signal and the preset signal threshold range, and when the sum of the first signal and the second signal is within the preset signal threshold range, determine the electromagnet input current And the electromagnet output current is normal.

As an example, the comparison circuit 30 includes a voltage comparator and a transistor.

It can be understood that when the first analog signal is the input current of the electromagnet, and the second analog signal is the output current of the electromagnet. If the electromagnet input current and the electromagnet output current are normal, the electromagnet input current and the electromagnet output current have the same magnitude, that is, the values of the first analog signal and the second analog signal are the same. When the forward circuit 10 takes the positive of the first analog signal and the inverting circuit 20 takes the inversion of the second analog signal, the obtained first signal is positive and the second signal is negative. If the input current of the electromagnet and the output current of the electromagnet are normal, and the first signal and the second signal are both voltage signals, the sum of the first signal and the second signal should fluctuate around 0V.

As an example, the preset signal threshold range is ±590mv.

According to an electromagnet current detection circuit for a maglev train provided by an embodiment of the present application, the detection circuit includes: a forward circuit, a reverse circuit and a comparison circuit. Wherein, the forward circuit is used for performing positive value processing on the input first analog signal, and outputting the first signal. The reverse circuit is used for inverting the input second analog signal and outputting the second signal. Wherein, the first analog signal is the input current of the electromagnet, and the second analog signal is the output current of the electromagnet, or, the first analog signal is the output current of the electromagnet, and the second analog signal is the input current of the electromagnet. The comparison circuit is used to determine that the electromagnet input current and the electromagnet output current are normal when the sum of the first signal and the second signal is within the preset signal threshold range. Through the detection form of the hardware circuit, it can accurately detect whether the input current and output current of the electromagnet of the maglev train are consistent, and then determine whether the electromagnet current is reliable.

Referring to FIG. 2 , FIG. 2 is a schematic structural diagram of another electromagnet current detection circuit for a maglev train provided in an embodiment of the present application. As shown in FIG. 2 , the electromagnet current detection circuit for the maglev train provided in the embodiment of the present application further includes a threshold generation circuit 40 .

The threshold generation circuit 40 is configured to generate a target clock signal through an input clock signal, wherein the threshold range of the target clock signal is a preset signal threshold range.

After the threshold generation circuit 40 generates the target clock signal, the target clock signal is input into the comparison circuit 30 . The comparison circuit 30 then compares the magnitude relationship between the preset signal threshold range of the target clock signal and the sum of the first signal and the second signal, and when the sum of the first signal and the second signal is within the preset signal threshold range, it is determined that the electromagnet Input current and solenoid output current are normal.

As an example, the input clock signal is a square wave signal with an amplitude of ±15V.

As an example, the threshold generating circuit 40 is composed of multiple resistors, and based on the input clock signal, the target clock signal is generated by means of resistor voltage division.

It should be noted that, for the relevant descriptions of the forward circuit 10 , the reverse circuit 20 and the comparison circuit 30 in the embodiment of the present application, reference may be made to the foregoing embodiments, and details are not repeated here.

The embodiment of the present application designs a forward circuit, a reverse circuit, a threshold generation circuit and a comparison circuit. Through the detection form of the hardware circuit, it can accurately detect whether the input current and output current of the electromagnet of the maglev train are consistent, and then determine whether the electromagnet current is reliable. .

Referring to FIG. 3 , FIG. 3 is a schematic structural diagram of another electromagnet current detection circuit for a maglev train provided in an embodiment of the present application. As shown in FIG. 3 , the electromagnet current detection circuit for the maglev train provided in the embodiment of the present application further includes a first signal filter circuit 50 , a second signal filter circuit 60 and a third signal filter circuit 70 .

The first signal filtering circuit 50 is configured to filter the input first signal to generate a filtered first signal.

The second signal filtering circuit 60 is configured to filter the input second signal to generate a filtered second signal.

Obtain the sum of the filtered first signal and the filtered second signal, the third signal filtering circuit 70 is used to filter the sum of the filtered first signal and the filtered second signal, and output the filtered output signal , and the filtered output signal is input to the comparison circuit 30 again. The third signal filtering circuit 70 is also used for filtering the target clock signal generated by the threshold generating circuit 40, and outputting the filtered target clock signal. The filtered target clock signal is then input to the comparison circuit 30 . The comparison circuit 30 is used to determine that the electromagnet input current and the electromagnet output current are normal when the filtered output signal is within the preset signal threshold range of the filtered target clock signal.

As an example, both the first signal filter circuit 50 and the second signal filter circuit 60 are composed of resistors and capacitors.

As an example, the third signal filtering circuit 70 is composed of capacitors.

It should be noted that, the relevant descriptions of the forward circuit 10 , the reverse circuit 20 , the comparison circuit 30 and the threshold generation circuit 40 in the embodiment of the present application can refer to the foregoing embodiments, and will not be repeated here.

The embodiment of the present application designs a forward circuit, a reverse circuit, a threshold generation circuit, a comparison circuit, a first signal filter circuit, a second signal filter circuit and a third signal filter circuit. Through the detection form of the hardware circuit, it can accurately detect whether the input current and output current of the electromagnet of the maglev train are consistent, and then determine whether the electromagnet current is reliable.

Referring to FIG. 4 , FIG. 4 is a schematic diagram of a specific circuit structure of an electromagnet current detection circuit for a maglev train provided in an embodiment of the present application. It should be noted that FIG. 4 is a specific circuit implementation of the structure shown in FIG. 3 .

As shown in FIG. 4 , the forward circuit 10 includes a first operational amplifier IC1 , and the reverse circuit 20 includes a second operational amplifier IC2 . The comparison circuit 30 includes a voltage comparator IC3 and a triode.

The first analog signal is input to the non-inverting input terminal of the first operational amplifier IC1 (that is, pin 3 of IC1 as shown in the figure). The inverting input end of the first operational amplifier IC1 (ie, pin 2 of IC1 in the figure) is connected to the output end of the first operational amplifier IC1 (ie, pin 1 of IC1 in the figure). The output terminal of the first operational amplifier IC1 outputs the first signal. As an example, the AD822 chip can be selected for the first operational amplifier IC1.

The second analog signal is input to the inverting input terminal of the second operational amplifier IC2 (that is, pin 2 of IC2 as shown). The non-inverting input terminal of the second operational amplifier IC2 (ie, pin 3 of IC2 in the figure) is grounded. The inverting input terminal of the second operational amplifier IC2 is connected to the output terminal of the second operational amplifier IC2 (ie, pin 1 of IC2 in the figure) through the first resistor R1. The output terminal of the second operational amplifier IC2 outputs the second signal. As an example, the AD822 chip can be selected for the second operational amplifier IC2.

The first signal filter circuit 50 includes a first capacitor C1 and a fifth resistor R5, and the second signal filter circuit 60 includes a second capacitor C2 and a sixth resistor R6. Wherein, the capacitance values of the first capacitor C1 and the second capacitor C2 are the same, and the resistance values of the fifth resistor R5 and the sixth resistor R6 are the same.

One end of the fifth resistor R5 is connected to the output end of the first operational amplifier IC1. The other end of the fifth resistor R5 and one end of the first capacitor C1 are connected to the first connection point A, and the first connection point A outputs the filtered first signal. The other end of the first capacitor C1 is connected to the positive pole of the power supply (+10V).

One end of the sixth resistor R6 is connected to the output end of the second operational amplifier IC2. The other end of the sixth resistor R6 and one end of the second capacitor C2 are connected to the second connection point B, and the second connection point B outputs the filtered second signal. The other end of the second capacitor C2 is connected to the negative pole of the power supply (-10V).

The first connection point A is connected to the second connection point B and then connected to the positive input terminal of the voltage comparator IC3 (that is, the 2 pins of IC3 in the figure), the first connection point A and the second connection point B are connected for A sum of the filtered first signal and the filtered second signal is obtained.

The threshold generating circuit 40 includes a second resistor R2, a third resistor R3 and a fourth resistor R4. Wherein, the resistance values of the third resistor R3 and the fourth resistor R4 are the same.

One end of the second resistor R2 is connected to the input clock signal. The other end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4 are connected to the reverse input end of the comparison circuit 30, the other end of the second resistor R2, one end of the third resistor R3 and the fourth resistor R4 are connected. One end of the resistor R4 is connected to obtain a target clock signal. The other end of the third resistor R3 is connected to the negative pole of the power supply (-10V); the other end of the fourth resistor R4 is connected to the positive pole of the power supply (+10V).

The third signal filter circuit 70 includes a third capacitor C3. One end of the third capacitor C3 is connected to the positive input end of the voltage comparator IC3. The other end of the third capacitor C3 is connected to the inverting input end of the voltage comparator (that is, pin 3 of IC3 in the figure). The third capacitor C3 is used to filter the sum of the filtered first signal and the filtered second signal, output the filtered output signal, and then input the filtered output signal to the positive input terminal of the comparison circuit 30 (i.e., the voltage positive input of comparator IC3). The third signal filtering circuit 70 is further configured to filter the target clock signal, and output the filtered target clock signal. The filtered target clock signal is then input to the inverting input terminal of the comparison circuit 30 (ie, the inverting input terminal of the voltage comparator IC3).

The positive input terminal of the voltage comparator IC3 is used to input the filtered output signal. The inverting input of voltage comparator IC3 is used for the filtered input target clock signal. The output terminal of the voltage comparator (that is, pin 3 of IC3 in the figure) is connected to the base of the triode. The emitter of the triode (that is, pin 1 of the triode shown in the figure) is connected to the seventh resistor, and the collector of the triode is connected to the positive pole of the +15V power supply.

When the sum of the first signal and the second signal is within the preset signal threshold range of the filtered target clock signal, the emitter of the triode outputs an output clock signal with the same frequency as the input clock signal to determine the electromagnet input circuit and the electromagnet The output current is normal.

When the sum of the first signal and the second signal exceeds the preset signal threshold range, the emitter of the triode outputs a normally high level or a normally low level, and it is determined that the electromagnet input current and the electromagnet output current are abnormal. Specifically, when the sum of the first signal and the second signal is higher than the preset signal threshold range, the emitter of the triode outputs a constant high level. When the sum of the first signal and the second signal is lower than the preset signal threshold range, the emitter of the transistor outputs a normally low level.

It should be noted that the output terminal of the first operational amplifier IC1 and the output terminal of the second operational amplifier IC2 can be directly connected to the positive input terminal of the comparison circuit 30 (ie, the positive input terminal of the voltage comparator IC3 ). The inverting input terminal of the comparison circuit 30 (the inverting input terminal of the voltage comparator IC3 ) inputs a target clock signal, and the threshold range of the target clock signal is a preset signal threshold range. The output terminal of the first operational amplifier IC1 is connected to the output terminal of the second operational amplifier IC2 for obtaining the sum of the first signal and the second signal. The comparison circuit 30 can directly compare the sum of the input first signal and the second signal with the preset signal threshold range, and determine the electromagnet input current when the sum of the first signal and the second signal is within the preset signal threshold range. And the electromagnet output current is normal.

In some implementations, the forward circuit 10 is used to perform scaling processing and positive value processing on the first analog signal. The reverse circuit 20 is used for scaling and negating the second analog signal. Wherein, the scaling ratio performed by the forward circuit 10 on the first analog signal is the same as that performed by the reverse circuit 20 on the second analog signal.

It is realized by the specific circuits of the forward circuit, the reverse circuit, the threshold generation circuit, the comparison circuit, the first signal filter circuit, the second signal filter circuit and the third signal filter circuit provided in the embodiment of the present application. In the detection form of the hardware circuit, it can accurately detect whether the input current and output current of the electromagnet of the maglev train are consistent, and then determine whether the electromagnet current is reliable.

The embodiment of the present application also provides a maglev train, which includes the maglev train electromagnet current detection circuit described in the above embodiment. For the detailed structure of the electromagnet current detection circuit of the maglev train, reference may be made to the above-mentioned embodiments, and details will not be repeated here. It can be understood that, since the maglev train in the embodiment of the present application uses the above-mentioned maglev train electromagnet current detection circuit. Therefore, the embodiment of the maglev train provided in the embodiment of the present application includes all the technical solutions of all the embodiments of the electromagnet current detection circuit of the above-mentioned maglev train, and the achieved technical effects are also completely the same, and will not be repeated here.

It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and for the related part, please refer to the description of the system part.

It should also be noted that in this document, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements , but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or equipment. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

A maglev train electromagnet current detection circuit, characterized in that the circuit includes: a forward circuit, a reverse circuit and a comparison circuit;

The forward circuit is used to perform positive value processing on the input first analog signal, and output the first signal;

The inverting circuit is used for inverting the input second analog signal and outputting the second signal;

Wherein, the first analog signal is the electromagnet input current, and the second analog signal is the electromagnet output current, or, the first analog signal is the electromagnet output current, and the second analog signal is the electromagnet output current. The electromagnet input current;

The comparison circuit is used to determine that the electromagnet input current and the electromagnet output current are normal when the sum of the first signal and the second signal is within a preset signal threshold range.
The circuit according to claim 1, wherein the forward circuit comprises a first operational amplifier;

The first analog signal is input to the positive input terminal of the first operational amplifier; the negative input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier; the output of the first operational amplifier output the first signal.
The circuit according to claim 2, wherein the inverting circuit comprises a second operational amplifier;

The second analog signal is input to the inverting input terminal of the second operational amplifier; the positive input terminal of the second operational amplifier is grounded; the inverting input terminal of the second operational amplifier passes through the first resistor and the The output terminal of the second operational amplifier is connected; the output terminal of the second operational amplifier outputs the second signal;

The output terminal of the first operational amplifier is connected to the output terminal of the second operational amplifier and then connected to the positive input terminal of the comparison circuit; the negative input terminal of the comparison circuit inputs the preset signal threshold range ; The output terminal of the first operational amplifier is connected to the output terminal of the second operational amplifier for obtaining the sum of the first signal and the second signal.
The circuit according to any one of claims 1-3, wherein the circuit further comprises: a threshold generation circuit;

The threshold generation circuit is used to generate a target clock signal through an input clock signal; the threshold range of the target clock signal is the preset signal threshold range; the comparison circuit is used to compare the preset signal threshold range with the preset signal threshold range The sum of the first signal and the second signal.
The circuit according to claim 4, wherein the threshold generating circuit comprises a second resistor, a third resistor, and a fourth resistor; the resistance values of the third resistor and the fourth resistor are the same;

One end of the second resistor is connected to the input clock signal; the other end of the second resistor, one end of the third resistor and one end of the fourth resistor are connected to the reverse input of the comparison circuit end, the other end of the second resistor, one end of the third resistor and one end of the fourth resistor are connected to obtain the target clock signal; the other end of the third resistor is connected to the negative pole of the power supply; The other end of the fourth resistor is connected to the positive pole of the power supply.
The circuit according to claim 5, wherein the comparison circuit comprises a voltage comparator and a triode;

The positive input terminal of the voltage comparator is used to input the sum of the first signal and the second signal; the negative input terminal of the voltage comparator is used to input the target clock signal; the voltage comparison The output terminal of the device is connected to the base of the triode;

When the sum of the first signal and the second signal is within the preset signal threshold range, the emitter of the triode outputs an output clock signal with the same frequency as the input clock signal, and determines that the electromagnet The input circuit and the output current of the electromagnet are normal.
The circuit according to claim 6, wherein when the sum of the first signal and the second signal exceeds the preset signal threshold range, the emitter of the triode outputs a constant high level Or normally low level, it is determined that the input current of the electromagnet and the output current of the electromagnet are abnormal.
The electromagnet current detection circuit of the maglev train according to claim 5, wherein the circuit further comprises: a first signal filter circuit and a second signal filter circuit; the first signal filter circuit comprises a first capacitor and a second signal filter circuit Five resistors; the second signal filter circuit includes a second capacitor and a sixth resistor; the first capacitor and the second capacitor have the same capacitance, and the fifth resistor and the sixth resistor have the same resistance ;

One end of the fifth resistor is connected to the output end of the first operational amplifier; the other end of the fifth resistor and one end of the first capacitor are connected to a first connection point, and the first connection point outputs the filter After the first signal; the other end of the first capacitor is connected to the positive pole of the power supply;

One end of the sixth resistor is connected to the output end of the second operational amplifier; the other end of the sixth resistor and one end of the second capacitor are connected to a second connection point, and the second connection point outputs the filter After the second signal; the other end of the second capacitor is connected to the negative pole of the power supply;

The first connection point is connected to the second connection point and then connected to the positive input terminal of the voltage comparator, and the first connection point is connected to the second connection point to obtain the filtered The sum of the first signal and the filtered second signal.
The electromagnet current detection circuit of the maglev train according to claim 8, wherein the circuit further comprises: a third signal filter circuit; the third signal filter circuit comprises a third capacitor;

One terminal of the third capacitor is connected to the positive input terminal of the voltage comparator; the other terminal of the third capacitor is connected to the negative input terminal of the voltage comparator.
A maglev train, characterized in that the maglev train comprises the maglev train electromagnet current detection circuit according to any one of claims 1-9.