Integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement

Abstract

The invention relates to a potentiometer for a rail transit locomotive, in particular to an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement. The technical problems that an existing potentiometer in a railway locomotive control electric appliance is high in material and process complexity requirement and poor in flexibility and adaptability, long-term abrasion between an electric brush and a resistor body in the using process easily causes product faults, and then the service life of a product is short are solved. A magnetic field direction measuring chip is used for measuring the rotation angle of a control shaft through the magnetic field change of magnetic steel; the output end of the magnetic field axial angle measuring circuit is used for being connected with a locomotive traction and brake control system. The photoelectric signal shaft angle measuring circuit is used for comparing the multiple paths of electric signals with a threshold value and then obtaining the rotation angle of the control shaft according to the compared electric signals, and the output end of the photoelectric signal shaft angle measuring circuit is used for being connected with a locomotive traction and brake control system.

Description

Technical Field

[0001] The invention relates to a potentiometer for rail transit locomotives, and in particular to an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement. Background Art

[0002] The driver controller is the main controller used by the driver to operate the locomotive, which can control the operating conditions and driving speed of the locomotive. In the driver controller, it is often necessary to convert control instructions (such as the size of traction or braking power) into voltage signals and output them to the train traction and braking control circuits. In order to improve the reliability of the control instruction output circuit, redundant circuits are usually used, and a dual-machine hot standby mode is adopted. When the two output voltages are consistent, the control system considers the control instruction from the driver controller to be valid; otherwise, the control system will consider the circuit to be faulty, and according to the principle of "fault-guided safety", the safety protection circuit will be triggered to downgrade driving or implement emergency braking.

[0003] At present, the industry mostly uses conductive plastic potentiometers or precision wirewound potentiometers to achieve this function, which have the following disadvantages:

[0004] 1. High requirements for material and process complexity. Conductive plastic potentiometers are generally made by printing a layer of conductive plastic material on a ceramic or plastic insulating substrate to form a resistor body. Precision wirewound potentiometers are generally made by tightly winding a resistor wire on a ceramic or plastic insulating frame to form a resistor body. Both have high material and process complexity and low production efficiency;

[0005] 2. Poor flexibility and adaptability. When the corresponding relationship between the output voltage and the control shaft angle changes, the resistor arrangement needs to be redesigned and produced, resulting in poor flexibility and adaptability.

[0006] 3. Material wear occurs during use, and the product life is short. Whether it is a conductive plastic potentiometer or a precision wirewound potentiometer, a brush mechanism is required to complete the electrical contact between the voltage output terminal and the resistor. During normal use, the brush and the resistor are constantly worn back and forth. Long-term wear will cause insufficient contact pressure of the brush, which is prone to poor contact between the brush and the resistor, causing the output voltage value to jump, causing product failure, and restricting the product's service life. Summary of the invention

[0007] The purpose of the present invention is to solve the technical problems that the potentiometers currently used in railway locomotive control electrical appliances have high requirements for material and process complexity, poor flexibility and adaptability, and long-term wear between the brush and the resistor during use, which easily causes product failure and thus leads to a short product life. An integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement is provided.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] An integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement, which is special in that it includes a control shaft, a shell coaxially sleeved on the control shaft, an infrared receiving circuit board, a code disk, an infrared transmitting circuit board, a magnetic steel mounting seat and a magnetic encoding circuit board which are sequentially located inside the shell from bottom to top; the code disk is fixedly connected to the control shaft; the infrared receiving circuit board is connected to the inner bottom of the shell; the infrared transmitting circuit board is sleeved on the control shaft and fixedly connected to the bottom of the shell; the magnetic encoding circuit board is connected to the infrared transmitting circuit board; the magnetic steel mounting seat is coaxially sleeved on the control shaft, and a magnetic steel is coaxially arranged on the magnetic steel mounting seat;

[0010] The magnetic encoding circuit board is provided with a magnetic field shaft angle measurement circuit, and a magnetic field direction measurement chip connected to an external power supply is provided at a position corresponding to the magnetic steel at the bottom thereof, and the output end of the magnetic field direction measurement chip is connected to the input end of the magnetic field shaft angle measurement circuit, so as to obtain the rotation angle of the control shaft by measuring the magnetic field change of the magnetic steel; the output end of the magnetic field shaft angle measurement circuit is used to be connected to the locomotive traction and braking control system;

[0011] An infrared light emitting tube array connected to an external power supply is arranged at the bottom of the infrared transmitting circuit board; an infrared photoelectric tube array is arranged at a position corresponding to the infrared light emitting tube array at the upper end of the infrared receiving circuit board; the code disk is located between the infrared light emitting tube array and the infrared photoelectric tube array, the infrared light emitting tube array is used to emit a light signal, and the infrared photoelectric tube array is used to receive the light signal passing through the code disk when the control shaft rotates, and convert it into a multi-channel electrical signal;

[0012] The infrared receiving circuit board is provided with a photoelectric signal shaft angle measurement circuit; the input end of the photoelectric signal shaft angle measurement circuit is connected to the output end of the infrared photoelectric tube array, and is used to compare multiple electrical signals with thresholds respectively, and obtain the rotation angle of the control shaft according to the compared electrical signals, and the output end of the photoelectric signal shaft angle measurement circuit is used to be connected to the locomotive traction and braking control system.

[0013] Further, the magnetic field shaft angle measurement circuit includes a first microcontroller, a first digital-to-analog converter, a first operational amplifier and a first DC-DC voltage converter;

[0014] The input end of the first microcontroller is connected to the output end of the magnetic field direction measurement chip, and is used to process the magnetic field change measured by the magnetic field direction measurement chip into a digital quantity; the output end of the first microcontroller is connected to the input end of the first digital-to-analog converter, and is used to convert the digital quantity into a voltage signal;

[0015] The power supply end of the magnetic field direction measurement chip, the power supply end of the first microcontroller, and the power supply end of the first digital-to-analog converter are respectively connected to an external power supply through a first DC-DC voltage converter;

[0016] The first operational amplifier has a non-inverting input terminal connected to the output terminal of the first digital-to-analog converter, an inverting input terminal connected to its output terminal, a power supply terminal connected to an external power supply, and an output terminal connected to a locomotive traction and braking control system and grounded, and is used to amplify the voltage signal and transmit it to the locomotive traction and braking control system.

[0017] Further, the photoelectric signal shaft angle measurement circuit includes a second DC-DC voltage converter, a second microcontroller, a second digital-to-analog converter, a second operational amplifier, a constant current drive circuit and a current comparison judgment circuit;

[0018] The input end of the constant current driving circuit is connected to an external power supply, and the output end thereof is connected to the input end of the infrared light emitting tube array, and is used to drive the infrared light emitting tube array to emit a light signal;

[0019] The input end of the current comparison and judgment circuit is connected to the output end of the infrared photoelectric tube array, and is used to compare the multi-channel electrical signals output by the infrared photoelectric tube array with the threshold value; the power supply end of the second microcontroller and the power supply end of the second digital-to-analog converter are respectively connected to the external power supply through the second DC-DC voltage converter; the input end of the second microcontroller is connected to the output end of the current comparison and judgment circuit, and is used to process the optical signal received by the infrared photoelectric tube array into a digital quantity; the output end of the second microcontroller is connected to the input end of the second digital-to-analog converter, and is used to convert the digital quantity into a multi-channel voltage signal;

[0020] The non-inverting input terminal of the second operational amplifier is connected to the output terminal of the second digital-to-analog converter, the inverting input terminal is connected to its output terminal, the power supply terminal is connected to an external power supply, and the output terminal is connected to the locomotive traction and braking control system and grounded, so as to amplify the voltage signal and transmit it to the locomotive traction and braking control system.

[0021] Furthermore, the code disc is printed with multiple circles of Gray code tracks arranged in concentric circles.

[0022] Furthermore, the outer shell includes a base and an upper cover connected to the base; the base is coaxially sleeved on the control shaft, and the base and the upper cover form an installation cavity; the infrared receiving circuit board, infrared photoelectric tube array, code disk, infrared light-emitting tube array, infrared transmitting circuit board and magnetic steel mounting seat are all arranged inside the installation cavity; the infrared transmitting circuit board is fixedly connected to the bottom of the base.

[0023] Furthermore, it also includes an elastic clamp ring; the base and the control shaft are fixedly connected via the elastic clamp ring.

[0024] Furthermore, it also includes an elastic pin; the magnetic steel mounting seat is connected to the control shaft through the elastic pin.

[0025] Furthermore, a limit ring is arranged on the control shaft; and the code disc is fixed on the limit ring.

[0026] Furthermore, the infrared light emitting tube array adopts an infrared light emitting diode array, and its infrared light peak wavelength is 950nm; the first DC-DC voltage converter and the second DC-DC voltage converter are both BUCK topology DC-DC voltage converters.

[0027] Furthermore, the magnetic steel mounting seat adopts non-magnetic conductive material; the magnetic steel adopts neodymium iron boron permanent magnet, and the magnetization direction is radial magnetization.

[0028] Beneficial effects of the present invention:

[0029] 1. The present invention is an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement, which does not involve the preparation of special conductive plastic materials, nor does it involve the tight winding process of resistance wire related to precision wirewound potentiometers, and has low requirements for material and process complexity.

[0030] 2. The present invention is an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement. When the corresponding relationship between the driver controller handle level and the output of the voltage signal changes or needs to be adjusted, it does not involve redesigning the resistor, nor does it involve mechanical adjustment or replacement of parts. It only needs to update the software configuration in the photoelectric receiving circuit board and the magnetic encoding circuit board, which makes it highly flexible and adaptable.

[0031] 3. The present invention is an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement. It does not have the brush structure existing in conventional potentiometers. In normal operation, it uses the "contactless" shaft angle information transmission in the form of photoelectric and magnetic field direction measurement. There is no mechanical wear of parts, so it has a long service life and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an embodiment of an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement of the present invention;

[0033] Figure 2 It is a three-dimensional structural schematic diagram of an embodiment of an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement of the present invention;

[0034] Figure 3 It is a block diagram of a magnetic field shaft angle measurement circuit in an embodiment of an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement of the present invention;

[0035] Figure 4The block diagram of the photoelectric signal shaft angle measurement circuit in an embodiment of an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement of the present invention.

[0036] Description of reference numerals:

[0037] 1-control shaft, 2-elastic clamp ring, 3-base, 4-infrared receiving circuit board, 5-infrared photoelectric tube array, 6-code disk, 7-infrared light-emitting tube array, 8-infrared transmitting circuit board, 9-elastic pin, 10-magnetic steel mounting seat, 11-magnetic steel, 12-magnetic field direction measurement chip, 13-magnetic encoding circuit board, 14-upper cover, 151-first DC-DC voltage converter, 152-second DC-DC voltage converter, 171-first microcontroller, 172-second microcontroller, 181-first digital-to-analog converter, 182-second digital-to-analog converter, 191-first operational amplifier, 192-second operational amplifier, 20-constant current drive circuit, 21-current comparison judgment circuit. DETAILED DESCRIPTION

[0038] like Figure 1 , Figure 2 As shown, an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement includes a control shaft 1, a housing coaxially sleeved on the control shaft 1, an infrared receiving circuit board 4, a code disk 6, an infrared transmitting circuit board 8, a magnetic steel mounting seat 10, a magnetic encoding circuit board 13, and an elastic clamp 2 and an elastic pin 9, which are located inside the housing from bottom to top; a limit ring is provided on the control shaft 1, the code disk 6 is fixed on the limit ring, and a multi-circle Gray code channel arranged in concentric circles is printed on the code disk 6. The infrared receiving circuit board 4 is connected to the inner bottom of the housing; the magnetic encoding circuit board 13 is connected to the infrared transmitting circuit board 8 through a hexagonal stud; the magnetic steel mounting seat 10 is coaxially sleeved on the control shaft 1, and the magnetic steel mounting seat 10 is bonded with a magnetic steel 11 coaxial with the control shaft 1.

[0039] In this embodiment, the housing includes a base 3 and an upper cover 14 connected to the base 3; the base 3 and the control shaft 1 are coaxially fixedly connected by an elastic collar 2, and the base 3 and the upper cover 14 form a mounting cavity; the magnetic steel mounting seat 10, the infrared transmitting circuit board 8, the infrared light-emitting tube array 7, the code disk 6, the infrared receiving circuit board 4 and the infrared photoelectric tube array 5 are all arranged on the control shaft 1 inside the mounting cavity; the infrared transmitting circuit board 8 is sleeved on the control shaft 1 and fixedly connected to the base 3 through a support column; the magnetic steel mounting seat 10 is fixedly connected to the control shaft 1 through an elastic pin 9. The material of the magnetic steel mounting seat 10 is a non-magnetic material. In this embodiment, the material of the magnetic steel mounting seat 10 is plastic. In other embodiments, the material of the magnetic steel mounting seat 10 is copper or aluminum. The magnetic steel 11 adopts a neodymium iron boron permanent magnet, and the magnetization direction is radial magnetization.

[0040] A magnetic field shaft angle measurement circuit is arranged on the magnetic encoding circuit board 13, and a magnetic field direction measurement chip 12 connected to an external power supply is arranged at a position at the bottom thereof corresponding to the magnetic steel 11. The output end of the magnetic field direction measurement chip 12 is connected to the input end of the magnetic field shaft angle measurement circuit, and is used to obtain the rotation angle of the control shaft 1 by measuring the magnetic field change of the magnetic steel 11; the output end of the magnetic field shaft angle measurement circuit is used to connect to the locomotive traction and braking control system.

[0041] An infrared light emitting tube array 7 connected to an external power supply is arranged at the bottom of the infrared transmitting circuit board 8; an infrared photoelectric tube array 5 is arranged at a position corresponding to the infrared light emitting tube array 7 on the upper end of the infrared receiving circuit board 4; the code disk 6 is located between the infrared light emitting tube array 7 and the infrared photoelectric tube array 5, the infrared light emitting tube array 7 is used to emit light signals, and the infrared photoelectric tube array 5 is used to receive the light signals passing through the code disk 6 when the control shaft 1 rotates, and convert them into multi-channel electrical signals.

[0042] An optical signal shaft angle measurement circuit is provided on the infrared receiving circuit board 4; the input end of the optical signal shaft angle measurement circuit is connected to the output end of the infrared photoelectric tube array 5, and is used to compare the multiple electrical signals with the threshold value respectively, and obtain the rotation angle of the control shaft 1 according to the compared electrical signals. The output end of the optical signal shaft angle measurement circuit is used to be connected to the locomotive traction and braking control system.

[0043] like Figure 3 As shown, the magnetic field axis angle measurement circuit includes a first microcontroller 171 (MCU), a first digital-to-analog converter 181 (DAC), a first operational amplifier 191 (OPA) and a first DC-DC voltage converter 151; the input end of the first microcontroller 171 is connected to the output end of the magnetic field direction measurement chip 12, and is used to process the magnetic field change measured by the magnetic field direction measurement chip 12 into a corresponding digital quantity that meets the voltage output requirement; the output end of the first microcontroller 171 is connected to the input end of the first digital-to-analog converter 181, and is used to convert the digital quantity into a voltage signal; the power supply end of the magnetic field direction measurement chip 12 and the power supply end of the first microcontroller 171 The first digital-to-analog converter 181 and the power supply terminal of the first digital-to-analog converter 181 are respectively connected to the external power supply through the first DC-DC voltage converter 151; the non-inverting input terminal of the first operational amplifier 191 is connected to the output terminal of the first digital-to-analog converter 181, the inverting input terminal of the first operational amplifier 191 is connected to its output terminal, and the voltage output terminal is used to provide negative feedback to maintain the stability of the output voltage; in addition to direct connection, in other embodiments, it can also be connected through an impedance network; the power supply terminal of the first operational amplifier 191 is connected to the external power supply, and the output terminal is connected to the locomotive traction and braking control system and grounded, and is used to amplify the voltage signal and transmit it to the locomotive traction and braking control system.

[0044] like Figure 4As shown, the photoelectric signal shaft angle measurement circuit includes a second DC-DC voltage converter 152, a second microcontroller 172, a second digital-to-analog converter 182, a second operational amplifier 192, a constant current drive circuit 20 and a current comparison and judgment circuit 21; the input end of the constant current drive circuit 20 is connected to an external power supply, and its output end is connected to the input end of the infrared light-emitting tube array 7, which is used to drive the infrared light-emitting tube array 7 to emit a light signal; the input end of the current comparison and judgment circuit 21 is connected to the output end of the infrared photoelectric tube array 5, which is used to compare the multi-channel electrical signals output by the infrared photoelectric tube array 5 with the threshold value; the power supply end of the second microcontroller 172 and the power supply end of the second digital-to-analog converter 182 are respectively connected to the external power supply through the second DC-DC voltage converter 152; the input end of the second microcontroller 172 is connected to the output end of the current comparison and judgment circuit 21, which is used to process the compared multi-channel electrical signals into The corresponding digital quantity that meets the voltage output requirements (since the infrared photoelectric tube array 5 outputs multiple electrical signals, each corresponding to a binary bit, the second microcontroller 172 needs to convert the multiple binary bits into corresponding digital quantities); the output end of the second microcontroller 172 is connected to the input end of the second digital-to-analog converter 182, which is used to convert the digital quantity into a voltage signal; the in-phase input end of the second operational amplifier 192 is connected to the output end of the second digital-to-analog converter 182, the inverting input end of the second operational amplifier 192 is connected to its output end, and the voltage output end is used to provide negative feedback to maintain the stability of the output voltage; in addition to direct connection, in other embodiments, it can also be connected through an impedance network; the power supply end of the second operational amplifier 192 is connected to an external power supply, and the output end is connected to the locomotive traction and braking control system and grounded, which is used to amplify the voltage signal and transmit it to the locomotive traction and braking control system.

[0045] In this embodiment, the infrared light emitting tube array 7 adopts an infrared light emitting diode array, and its infrared light peak wavelength is 950nm; the first DC-DC voltage converter 151 and the second DC-DC voltage converter 152 are both BUCK topology DC-DC 5V voltage converters.

[0046] When the control shaft 1 rotates, the code disk 6, the elastic pin 9, the magnetic steel mounting seat 10 and the magnetic steel 11 rotate together with the control shaft 1, and the light signal of the light emitting diode array passes through the rotating code disk 6, and is received by the infrared photoelectric tube array 5 as Gray codes of different values. The infrared photoelectric tube array 5 transmits the Gray code to the input end of the current comparison judgment circuit 21, thereby sensing the current driver controller handle level. The first digital-to-analog converter 181 converts the Gray code into a voltage signal and outputs it to the locomotive traction and braking control system according to the output correspondence between the driver controller handle level and the voltage signal. At the same time, the magnetic field direction measurement chip 12 senses the rotation angle of the current driver controller control shaft 1 through the magnetic steel 11, and the second digital-to-analog converter 182 converts the magnetic field direction into a voltage signal and outputs it according to the output correspondence between the driver controller handle level and the voltage signal.

[0047] The present invention is an integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement, which realizes the conversion of the rotation angle of the driver controller control handle (control shaft 1) into two electrically isolated voltage signal outputs. There is no electrical connection between the magnetic field shaft angle measurement circuit and the photoelectric signal shaft angle measurement circuit, which are electrically isolated and independent of each other, work in hot standby redundancy, and output through different wiring terminals, thereby improving the reliability of the potentiometer.

Claims

1. An integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement, characterized in that: The invention comprises a control shaft (1), a shell coaxially sleeved on the control shaft (1), an infrared receiving circuit board (4), a code disk (6), an infrared transmitting circuit board (8), a magnetic steel mounting seat (10) and a magnetic encoding circuit board (13) which are sequentially located inside the shell from bottom to top; the code disk (6) is fixedly connected to the control shaft (1); the infrared receiving circuit board (4) is connected to the inner bottom of the shell; the infrared transmitting circuit board (8) is sleeved on the control shaft (1) and fixedly connected to the bottom of the shell; the magnetic encoding circuit board (13) is connected to the infrared transmitting circuit board (8); the magnetic steel mounting seat (10) is coaxially sleeved on the control shaft (1), and a magnetic steel (11) is coaxially arranged on the magnetic steel mounting seat (10); The magnetic encoding circuit board (13) is provided with a magnetic field shaft angle measurement circuit, and a magnetic field direction measurement chip (12) connected to an external power source is provided at a position at the bottom thereof corresponding to the magnetic steel (11); the output end of the magnetic field direction measurement chip (12) is connected to the input end of the magnetic field shaft angle measurement circuit, and is used to obtain the rotation angle of the control shaft (1) by measuring the magnetic field change of the magnetic steel (11); the output end of the magnetic field shaft angle measurement circuit is used to be connected to a locomotive traction and braking control system; An infrared light emitting tube array (7) connected to an external power source is disposed at the bottom of the infrared transmitting circuit board (8); an infrared photoelectric tube array (5) is disposed at a position corresponding to the infrared light emitting tube array (7) at the upper end of the infrared receiving circuit board (4); the code disk (6) is located between the infrared light emitting tube array (7) and the infrared photoelectric tube array (5); the infrared light emitting tube array (7) is used to emit a light signal, and the infrared photoelectric tube array (5) is used to receive the light signal passing through the code disk (6) when the control shaft (1) rotates, and convert it into a multi-channel electrical signal; The infrared receiving circuit board (4) is provided with a photoelectric signal shaft angle measurement circuit; the input end of the photoelectric signal shaft angle measurement circuit is connected to the output end of the infrared photoelectric tube array (5), and is used to compare multiple electrical signals with threshold values ​​respectively, and obtain the rotation angle of the control shaft (1) according to the compared electrical signals; the output end of the photoelectric signal shaft angle measurement circuit is used to be connected to the locomotive traction and braking control system.

2. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 1, characterized in that: The magnetic field shaft angle measurement circuit comprises a first microcontroller (171), a first digital-to-analog converter (181), a first operational amplifier (191) and a first DC-DC voltage converter (151); The input end of the first microcontroller (171) is connected to the output end of the magnetic field direction measurement chip (12), and is used to process the magnetic field change measured by the magnetic field direction measurement chip (12) into a digital quantity; the output end of the first microcontroller (171) is connected to the input end of the first digital-to-analog converter (181), and is used to convert the digital quantity into a voltage signal; The power supply end of the magnetic field direction measurement chip (12), the power supply end of the first microcontroller (171), and the power supply end of the first digital-to-analog converter (181) are respectively connected to an external power supply through a first DC-DC voltage converter (151); The first operational amplifier (191) has a non-inverting input terminal connected to the output terminal of the first digital-to-analog converter (181), an inverting input terminal connected to the output terminal thereof, a power supply terminal connected to an external power supply, and an output terminal connected to a locomotive traction and braking control system and grounded, and is used for amplifying a voltage signal and transmitting it to the locomotive traction and braking control system.

3. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 1 or 2, characterized in that: The photoelectric signal shaft angle measurement circuit comprises a second DC-DC voltage converter (152), a second microcontroller (172), a second digital-to-analog converter (182), a second operational amplifier (192), a constant current drive circuit (20) and a current comparison judgment circuit (21); The input end of the constant current driving circuit (20) is connected to an external power source, and the output end thereof is connected to the input end of the infrared light emitting tube array (7), and is used to drive the infrared light emitting tube array (7) to emit a light signal; The input end of the current comparison and judgment circuit (21) is connected to the output end of the infrared photoelectric tube array (5) and is used to compare the multi-channel electrical signals output by the infrared photoelectric tube array (5) with the threshold value; The power supply end of the second microcontroller (172) and the power supply end of the second digital-to-analog converter (182) are respectively connected to an external power supply through a second DC-DC voltage converter (152); the input end of the second microcontroller (172) is connected to the output end of the current comparison judgment circuit (21) for processing the compared multi-channel electrical signals into digital quantities; the output end of the second microcontroller (172) is connected to the input end of the second digital-to-analog converter (182) for converting the digital quantities into voltage signals; The second operational amplifier (192) has a non-inverting input terminal connected to the output terminal of the second digital-to-analog converter (182), an inverting input terminal connected to its output terminal, a power supply terminal connected to an external power supply, and an output terminal connected to a locomotive traction and braking control system and grounded, and is used to amplify the voltage signal and transmit it to the locomotive traction and braking control system.

4. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 3, characterized in that: The code disc (6) is printed with multiple Gray code tracks arranged in concentric circles.

5. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 4, characterized in that: The housing comprises a base (3) and an upper cover (14) connected to the base (3); The base (3) is coaxially sleeved on the control shaft (1), and the base (3) and the upper cover (14) form a mounting cavity; The infrared receiving circuit board (4), the infrared photoelectric tube array (5), the code disk (6), the infrared light emitting tube array (7), the infrared transmitting circuit board (8) and the magnetic steel mounting seat (10) are all arranged inside the mounting cavity; The infrared emitting circuit board (8) is fixedly connected to the bottom of the base (3).

6. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 5, characterized in that: Also includes an elastic collar (2); The base (3) and the control shaft (1) are fixedly connected via an elastic clamping ring (2).

7. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 6, characterized in that: Also includes an elastic pin (9); The magnetic steel mounting seat (10) is connected to the control shaft (1) via an elastic pin (9).

8. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 7, characterized in that: A limit ring is provided on the control shaft (1); The code disc (6) is fixed on the limiting ring.

9. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 8, characterized in that: The infrared light emitting tube array (7) adopts an infrared light emitting diode array, and its infrared light peak wavelength is 950nm; The first DC-DC voltage converter (151) and the second DC-DC voltage converter (152) are both BUCK topology DC-DC voltage converters.

10. The integrated redundant electronic potentiometer based on magnetic field and photoelectric signal measurement according to claim 9, characterized in that: The magnetic steel mounting seat (10) is made of non-magnetic conductive material; The magnetic steel (11) is made of neodymium iron boron permanent magnet, and the magnetization direction is radial magnetization.

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