Resolver and eddy current position sensor simulation board

Abstract

The present invention relates to the field of sensor simulation technology, and discloses a rotary transformer and eddy current position sensor simulation board, comprising: an interface circuit for communicating with a host computer and receiving configuration instructions sent by the host computer; a first input end of an FPGA is connected to the interface circuit, a second input end of the FPGA is connected to a first output end of an input unit, and an output end of the FPGA is connected to a first input end of an output unit; an input end of the input unit is connected to an ECU controller, a second output end of the input unit is connected to a second input end of the output unit; and an output end of the output unit is connected to the ECU controller. This solution can realize the test simulation of normal and abnormal conditions of an ECU in two different sensor simulation modes using one sensor simulation board by configuring different instructions and parameters on the host computer, thereby shortening the R&D and testing cycle, improving efficiency, and reducing costs.

Description

[0001] This patent is a divisional application of the Chinese invention patent application with application number 202410412065.0, application date April 8, 2024, and invention name "A rotary transformer and eddy current position sensor simulation board". Technical Field

[0002] The invention relates to the technical field of sensor simulation, and in particular to a rotary transformer and an eddy current position sensor simulation board. Background Art

[0003] With the development of intelligent and electrified trends, the proportion of automotive electronics in the vehicle is increasing, and the requirements for ECU (Electronic Control Unit) are getting higher and higher. The interconnection and coordination between systems have become the key. Simulation testing can simulate the real system environment, perform integration testing and collaborative verification of each system, and ensure the stability and reliability of the system.

[0004] Since automotive electronics require the use of multiple sensors for testing under normal and abnormal conditions, and different manufacturers or models require the use of different types of sensors for simulation testing, purchasing multiple independent sensor simulation boards is not only costly, but also requires frequent switching of sensor simulation boards during testing, resulting in long R&D or testing cycles. In addition, there is little research on eddy current position sensor simulation boards in the prior art.

[0005] Therefore, there is an urgent need for a rotary transformer and eddy current position sensor simulation board that can shorten the R&D and testing cycle, improve efficiency and reduce costs. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a rotary transformer and eddy current position sensor simulation board, which can shorten the R&D and testing cycle, improve efficiency and reduce costs.

[0007] The present invention provides a rotary transformer and eddy current position sensor simulation board, which includes a rotary transformer type motor position sensor simulation output mode and an eddy current type motor position sensor simulation output mode; the sensor simulation board includes: an interface circuit, an FPGA, an input unit and an output unit;

[0008] The interface circuit is used to communicate with the host computer and receive configuration instructions sent by the host computer;

[0009] The first input terminal of the FPGA is connected to the interface circuit, the second input terminal of the FPGA is connected to the first output terminal of the input unit, and the output terminal of the FPGA is connected to the first input terminal of the output unit;

[0010] The input end of the input unit is connected to the ECU controller, and the second output end of the input unit is connected to the second input end of the output unit; the output unit includes: a digital-to-analog converter, a single-ended to differential circuit, a first output protection circuit, a second output protection circuit, a first transformer circuit, a second transformer circuit, a first toggle switch, a second toggle switch, a third toggle switch, a fourth toggle switch, and a fifth toggle switch; the output unit is used to switch the rotary transformer type motor position sensor simulation output mode or the eddy current type motor position sensor simulation output mode according to the configuration instruction;

[0011] When the resolver and eddy current position sensor simulation board is in resolver type motor position sensor simulation output mode, the single-ended to differential circuit is not connected in series with the circuit;

[0012] When the rotary transformer and eddy current position sensor simulation board is in the eddy current motor position sensor simulation output mode, the first transformer circuit and the second transformer circuit are not connected in series to the circuit;

[0013] The output end of the output unit is connected to the ECU controller.

[0014] Further, when the rotary transformer and eddy current position sensor simulation board is in the rotary transformer type motor position sensor simulation output mode, the single-ended to differential circuit is not connected in series with the circuit, specifically including:

[0015] The input end of the digital-to-analog converter is connected to the output end of the FPGA and the second output end of the input unit, the first output end of the digital-to-analog converter is connected to the common end of the first toggle switch, and the second output end of the digital-to-analog converter is connected to the normally closed contact of the third toggle switch;

[0016] The normally closed contact of the first toggle switch is connected to the normally closed contact of the second toggle switch, the first toggle switch is connected to the normally closed contact, and the second toggle switch is connected to the normally closed contact;

[0017] The input end of the first output protection circuit is connected to the common end of the second slide switch, the output end of the first output protection circuit is connected to the common end of the fourth slide switch, and the fourth slide switch is connected to the normally closed contact;

[0018] The input end of the first transformer circuit is connected to the normally closed contact of the fourth toggle switch, and the output end of the first transformer is connected to the ECU controller;

[0019] The input end of the second output protection circuit is connected to the common end of the third slide switch, the output end of the second output protection circuit is connected to the common end of the fifth slide switch, and the fifth slide switch is connected to the normally closed contact;

[0020] The input end of the second transformer circuit is connected to the normally closed contact of the fifth toggle switch, and the output end of the second transformer is connected to the ECU controller.

[0021] Further, when the rotary transformer and eddy current position sensor simulation board is in the eddy current motor position sensor simulation output mode, the first transformer circuit and the second transformer circuit are not connected in series, specifically including:

[0022] The input end of the digital-to-analog converter is connected to the output end of the FPGA and the second output end of the input unit, the first output end of the digital-to-analog converter is connected to the common end of the first toggle switch, and the first toggle switch is connected to the normally open contact;

[0023] The input end of the single-ended to differential circuit is connected to the normally open contact of the first toggle switch, the first output end of the single-ended to differential circuit is connected to the normally open contact of the second toggle switch, and the second output end of the single-ended to differential circuit is connected to the normally open contact of the third toggle switch; the second toggle switch is connected to the normally open contact, and the third toggle switch is connected to the normally open contact;

[0024] The input end of the first output protection circuit is connected to the common end of the second slide switch, the output end of the first output protection circuit is connected to the common end of the fourth slide switch, the fourth slide switch is connected to the normally open contact, and the normally open contact of the fourth slide switch is connected to the ECU controller;

[0025] The input end of the second output protection circuit is connected to the common end of the third toggle switch, the output end of the second output protection circuit is connected to the common end of the fifth toggle switch, the fifth toggle switch is connected to the normally open contact, and the normally open contact of the fifth toggle switch is connected to the ECU controller.

[0026] Further, the single-ended to differential circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fully differential operational amplifier, a first capacitor, and a second capacitor;

[0027] One end of the first resistor is connected to the normally open contact of the first toggle switch, and the other end is connected to the positive input terminal of the fully differential operational amplifier and the second resistor;

[0028] One end of the second resistor is connected to the positive input terminal of the fully differential operational amplifier, and the other end is connected to the negative output terminal of the fully differential operational amplifier and the normally open contact of the third toggle switch;

[0029] One end of the third resistor is grounded, and the other end is connected to the negative input terminal of the fully differential operational amplifier and the fourth resistor;

[0030] One end of the fourth resistor is connected to the negative input terminal of the fully differential operational amplifier, and the other end is connected to the positive output terminal of the fully differential operational amplifier and the normally open contact of the second toggle switch;

[0031] One end of the first capacitor is grounded, and the other end is connected to the power supply pin of the fully differential operational amplifier;

[0032] One end of the second capacitor is grounded, and the other end is connected to the output common mode voltage pin of the fully differential operational amplifier.

[0033] Further, the first output protection circuit includes: a first operational amplifier, a third capacitor, a fourth capacitor, a fifth capacitor, a first DC circuit, a second DC circuit, a third DC circuit, an output current limiting circuit, an input current limiting circuit, a clamping protection circuit, an undervoltage protection circuit, an overvoltage protection circuit, an eleventh diode, a twelfth diode, a first amplifying transistor, and a second amplifying transistor;

[0034] The non-inverting input terminal of the first operational amplifier is connected to the common terminal of the second toggle switch, and the output terminal of the first operational amplifier is connected to the inverting input terminal of the first operational amplifier via the third capacitor;

[0035] One end of the third capacitor is connected to the output end of the first operational amplifier, and the other end is connected to the inverting input end of the first operational amplifier;

[0036] One end of the fourth capacitor is grounded, and the other end is connected to the input end of the first DC circuit;

[0037] The first DC circuit includes a first diode, a second diode and a fifth resistor, the anode of the first diode is connected to the power supply terminal, the cathode of the first diode is connected to the anode of the second diode, the cathode of the second diode is connected to one end of the fifth resistor, and the other end of the fifth resistor is grounded;

[0038] One end of the fifth capacitor is grounded, and the other end is connected to the input end of the second DC circuit;

[0039] The second DC circuit includes a third diode, a fourth diode and a sixth resistor, the cathode of the fourth diode is connected to the power supply terminal, the anode of the fourth diode is connected to the cathode of the third diode, the anode of the third diode is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded;

[0040] The third DC circuit includes a fifth diode, a sixth diode, a seventh diode, an eighth diode, a seventh resistor, an eighth resistor, a first triode and a second triode, one end of the seventh resistor is connected to one end of the fourth capacitor and the anode of the first diode, the other end of the seventh resistor is connected to the first end of the first triode, the base of the first triode is connected to the cathode of the second diode and one end of the fifth resistor, the second end of the first triode is connected to the anode of the fifth diode, the cathode of the fifth diode is connected to the anode of the sixth diode, the cathode of the sixth diode is connected to the anode of the seventh diode and the output end of the first operational amplifier, the cathode of the seventh diode is connected to the anode of the eighth diode, the cathode of the eighth diode is connected to the first end of the second triode, the base of the second triode is connected to one end of the sixth resistor and the anode of the third diode, the second end of the second triode is connected to one end of the eighth resistor, and the other end of the eighth resistor is connected to one end of the fifth capacitor and the cathode of the fourth diode;

[0041] The clamping protection circuit includes a ninth diode and a tenth diode, the cathode of the ninth diode is connected to the positive end of the power supply, the anode of the ninth diode is connected to the cathode of the tenth diode and the inverting input end of the first operational amplifier, and the anode of the tenth diode is connected to the negative end of the power supply;

[0042] The output current limiting circuit includes a third triode, a ninth resistor and a tenth resistor, wherein a first end of the third triode is connected to a second end of the first triode and a base of the first amplifying transistor, a second end of the third triode is connected to one end of the tenth resistor and an anode of the eleventh diode, a base of the third triode is connected to one end of the ninth resistor, and the other end of the ninth resistor is connected to one end of the tenth resistor and a second end of the first amplifying transistor;

[0043] The input current limiting circuit includes a fourth triode, an eleventh resistor and a twelfth resistor, wherein a first end of the fourth triode is connected to a first end of the second triode and a base of the second amplifying transistor, a second end of the fourth triode is connected to one end of the twelfth resistor and a cathode of the twelfth diode, a base of the fourth triode is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to one end of the twelfth resistor and a first end of the second amplifying transistor;

[0044] The undervoltage protection circuit includes a first voltage stabilizing diode and a thirteenth resistor, wherein the anode of the first voltage stabilizing diode is connected to the base of the third transistor, the cathode of the first voltage stabilizing diode is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the first end of the first amplifying transistor;

[0045] The overvoltage protection circuit includes a second voltage stabilizing diode and a fourteenth resistor, wherein the cathode of the second voltage stabilizing diode is connected to the base of the fourth transistor, the anode of the second voltage stabilizing diode is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the second end of the second amplifying transistor;

[0046] The structure of the second output protection circuit is the same as that of the first output protection circuit.

[0047] Further, the first transformer circuit includes: a first transformer and a first fuse;

[0048] One end of the input side of the first transformer is connected to the normally closed contact of the fourth slide switch, and the other end is grounded. One end of the output side of the first transformer is connected to one end of the first fuse, and the other end of the first fuse is connected to the normally open contact of the fourth slide switch as the positive end of the differential output. The other end of the output side of the first transformer is the negative end of the differential output. The positive end of the differential output and the negative end of the differential output are connected to the ECU controller.

[0049] The structure of the second transformer circuit is the same as that of the first transformer circuit.

[0050] Further, the input unit includes: a second transformer, a second fuse, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a sixth capacitor, a fifteenth diode, a same-direction amplifier circuit, a third operational amplifier, and a hysteresis comparator;

[0051] One end of the input side of the second transformer is connected to one end of the second fuse, the other end of the second fuse is connected to the ECU controller, the other end of the input side of the second transformer is connected to the ECU controller, and the output side of the second transformer is connected to the same-direction amplifier circuit;

[0052] The non-inverting amplifier circuit includes a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a sixth slide switch, and a second operational amplifier, one end of the twentieth resistor is connected to one end of the output side of the second transformer, the other end of the twentieth resistor is connected to one end of the twenty-first resistor and a non-inverting input end of the second operational amplifier, the other end of the twenty-first resistor is grounded, one end of the twenty-second resistor is connected to the other end of the output side of the second transformer and is grounded, the other end of the twenty-second resistor is connected to one end of the twenty-third resistor and an inverting input end of the second operational amplifier, and the other end of the twenty-third resistor is connected to the output end of the second operational amplifier and a normally closed contact of the sixth slide switch;

[0053] The sixth capacitor is connected in parallel with the twenty-third resistor;

[0054] The non-inverting input terminal of the third operational amplifier is connected to the common terminal of the sixth slide switch and the input reference pin of the digital-to-analog converter, the normally open contact of the sixth slide switch is connected to the reference voltage, and the inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier and the anode of the fifteenth diode;

[0055] The cathode of the fifteenth diode is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is connected to one end of the sixteenth resistor and the inverting input end of the hysteresis comparator, and the other end of the sixteenth resistor is grounded;

[0056] The non-inverting input terminal of the hysteresis comparator is connected to one end of the seventeenth resistor, one end of the eighteenth resistor and one end of the nineteenth resistor, the other end of the seventeenth resistor is connected to the power supply, the other end of the eighteenth resistor is grounded, and the other end of the nineteenth resistor is connected to the output terminal of the hysteresis comparator and the second input terminal of the FPGA.

[0057] Furthermore, the sensor simulation board also includes: a power supply unit and an isolation power supply unit;

[0058] The input end of the power supply unit is connected to the output end of the isolation power supply unit, and the output end of the power supply unit is respectively connected to the interface circuit, the FPGA, the input unit and the output unit.

[0059] The embodiments of the present invention have the following technical effects:

[0060] Communicate with the host computer through the interface circuit, receive the configuration instructions sent by the host computer, and send them to the FPGA. The FPGA generates a control signal and a rotary transformer type signal, or a control signal and an eddy current type signal according to the configuration instructions and the excitation signal collected by the input unit; the output unit processes the rotary transformer type signal according to the control signal and outputs it through an isolation transformer, or the output unit processes the eddy current type signal according to the control signal and outputs it to the ECU controller. Since the configuration instructions include sensor state parameter configuration instructions, the rotary transformer and eddy current position sensor simulation board provided by this solution can use one sensor simulation board to realize the test simulation of normal and abnormal conditions of the ECU in two different sensor simulation modes, shortening the R&D and testing cycle, improving efficiency, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0062] Figure 1 It is a structural schematic diagram of a rotary transformer and an eddy current position sensor simulation board provided by an embodiment of the present invention;

[0063] Figure 2It is a structural schematic diagram of an output unit of a rotary transformer and an eddy current position sensor simulation board provided by an embodiment of the present invention;

[0064] Figure 3 is a structural schematic diagram of a single-ended to differential circuit in an output unit provided by an embodiment of the present invention;

[0065] Figure 4 is a structural schematic diagram of a first output protection circuit in an output unit provided by an embodiment of the present invention;

[0066] Figure 5 is a structural schematic diagram of a first transformer circuit in an output unit provided by an embodiment of the present invention;

[0067] Figure 6 It is a structural schematic diagram of an input unit of a rotary transformer and an eddy current position sensor simulation board provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0069] Figure 1 This is a schematic diagram of the structure of a rotary transformer and eddy current position sensor simulation board provided by an embodiment of the present invention, see Figure 1 The rotary transformer and eddy current position sensor simulation board includes a rotary transformer type motor position sensor simulation output mode and an eddy current type motor position sensor simulation output mode; the sensor simulation board includes: an interface circuit 100, an FPGA 200, an input unit 300 and an output unit 400;

[0070] The interface circuit 100 is used to communicate with a host computer and receive configuration instructions sent by the host computer.

[0071] A first input terminal of the FPGA 200 is connected to the interface circuit 100 , a second input terminal of the FPGA 200 is connected to a first output terminal of the input unit 300 , and an output terminal of the FPGA 200 is connected to a first input terminal of the output unit 400 .

[0072] Specifically, the output of FPGA 200 includes a control signal and a resolver type signal, or a control signal and an eddy current type signal.

[0073] The input end of the input unit 300 is connected to the ECU controller, and the second output end of the input unit 300 is connected to the second input end of the output unit 400; the output unit 400 includes: a digital-to-analog converter 401, a single-ended to differential circuit 402, a first output protection circuit 403, a second output protection circuit 404, a first transformer circuit 405, a second transformer circuit 406, a first toggle switch S1, a second toggle switch S2, a third toggle switch S3, a fourth toggle switch S4 and a fifth toggle switch S5; the output unit 400 is used to switch the rotary transformer type motor position sensor simulation output mode or the eddy current type motor position sensor simulation output mode according to the configuration instruction. The output end of the output unit 400 is connected to the ECU controller.

[0074] Specifically, the input end of the input unit 300 is the Sense+ / Sense- signal. The output end of the output unit 400 is the SIN+ / SIN- signal and the COS+ / COS- signal. In the default state of the five toggle switches, the sensor simulation board is in the rotary transformer type motor position sensor simulation output mode. When the five toggle switches are toggled at the same time, the sensor simulation board is in the eddy current type motor position sensor simulation output mode.

[0075] Figure 2 Schematic diagram of the structure of the output unit of a rotary transformer and eddy current position sensor simulation board provided by the embodiment of the present invention, see Figure 2 When the rotary transformer and eddy current position sensor simulation board is in the rotary transformer type motor position sensor simulation output mode, the single-ended to differential circuit 402 is not connected in series with the circuit. At this time, the internal circuit connection mode of the output unit is:

[0076] The input end of the digital-to-analog converter 401 is connected to the output end of the FPGA 200 and the second output end of the input unit 300, the first output end of the digital-to-analog converter 401 is connected to the common end of the first slide switch S1, and the second output end of the digital-to-analog converter 401 is connected to the normally closed contact of the third slide switch S3;

[0077] The normally closed contact of the first toggle switch S1 is connected to the normally closed contact of the second toggle switch S2. The first toggle switch S1 is connected to the normally closed contact, and the second toggle switch S2 is connected to the normally closed contact.

[0078] The input end of the first output protection circuit 403 is connected to the common end of the second slide switch S2, the output end of the first output protection circuit 403 is connected to the common end of the fourth slide switch S4, and the fourth slide switch S4 is connected to the normally closed contact;

[0079] The input end of the first transformer circuit 405 is connected to the normally closed contact of the fourth toggle switch S4, and the output end of the first transformer circuit 405 is connected to the ECU controller;

[0080] The input end of the second output protection circuit 404 is connected to the common end of the third slide switch S3, the output end of the second output protection circuit 404 is connected to the common end of the fifth slide switch S5, and the fifth slide switch S5 is connected to the normally closed contact;

[0081] An input end of the second transformer circuit 406 is connected to the normally closed contact of the fifth toggle switch S5 , and an output end of the second transformer circuit 406 is connected to the ECU controller.

[0082] Continue to see Figure 2 When the rotary transformer and eddy current position sensor simulation board is in the eddy current motor position sensor simulation output mode, the first transformer circuit 405 and the second transformer circuit 406 are not connected in series. At this time, the internal circuit connection mode of the output unit is:

[0083] The input end of the digital-to-analog converter 401 is connected to the output end of the FPGA 200 and the second output end of the input unit 300, the first output end of the digital-to-analog converter 401 is connected to the common end of the first slide switch S1, and the first slide switch S1 is connected to the normally open contact;

[0084] The input end of the single-ended to differential circuit 402 is connected to the normally open contact of the first slide switch S1, the first output end of the single-ended to differential circuit 402 is connected to the normally open contact of the second slide switch S2, and the second output end of the single-ended to differential circuit 402 is connected to the normally open contact of the third slide switch S3; the second slide switch S2 is connected to the normally open contact, and the third slide switch S3 is connected to the normally open contact;

[0085] The input end of the first output protection circuit 403 is connected to the common end of the second slide switch S2, the output end of the first output protection circuit 403 is connected to the common end of the fourth slide switch S4, the fourth slide switch S4 is connected to the normally open contact, and the normally open contact of the fourth slide switch S4 is connected to the ECU controller;

[0086] The input end of the second output protection circuit 404 is connected to the common end of the third toggle switch S3, the output end of the second output protection circuit 404 is connected to the common end of the fifth toggle switch S5, the fifth toggle switch S5 is connected to the normally open contact, and the normally open contact of the fifth toggle switch S5 is connected to the ECU controller.

[0087] Furthermore, Figure 3 is a schematic diagram of a single-ended to differential circuit in an output unit provided by an embodiment of the present invention, see Figure 3 , the single-ended to differential circuit 402 includes: a first resistor R7, a second resistor R6, a third resistor R8, a fourth resistor R10, a fully differential operational amplifier U2, a first capacitor C3 and a second capacitor C6;

[0088] One end of the first resistor R7 is connected to the normally open contact of the first toggle switch S1, and the other end is connected to the positive input terminal of the fully differential operational amplifier U2 and the second resistor R6;

[0089] One end of the second resistor R6 is connected to the positive input terminal of the fully differential operational amplifier U2, and the other end is connected to the negative output terminal of the fully differential operational amplifier U2 and the normally open contact of the third toggle switch S3;

[0090] One end of the third resistor R8 is grounded, and the other end is connected to the negative input terminal of the fully differential operational amplifier U2 and the fourth resistor R10;

[0091] One end of the fourth resistor R10 is connected to the negative input terminal of the fully differential operational amplifier U2, and the other end is connected to the positive output terminal of the fully differential operational amplifier U2 and the normally open contact of the second toggle switch S2;

[0092] One end of the first capacitor C3 is grounded, and the other end is connected to the power supply pin (VS+) of the fully differential operational amplifier U2;

[0093] One end of the second capacitor C6 is grounded, and the other end is connected to the output common mode voltage pin (VOCM) of the fully differential operational amplifier U2.

[0094] Specifically, when the working mode is the rotary transformer type motor position sensor simulation output mode, the common end of the first slide switch S1, the second slide switch S2, and the third slide switch S3 are toggled to connect them to the normally closed contact, and the digital-to-analog converter 401 outputs two rotary transformer analog signals, which are respectively connected to the first output protection circuit 403 and the second output protection circuit 404.

[0095] When the working mode is the eddy current motor position sensor simulation output mode, the common end of the first slide switch S1, the second slide switch S2 and the third slide switch S3 are toggled to connect them to the normally open contact, and the first output end of the digital-to-analog converter 401 passes through the first slide switch S1 to the first resistor R7 at the input end of the single-ended differential circuit 402. The fully differential operational amplifier U2 has positive and negative feedbacks, and the amplification factor is determined by the ratio of the second resistor R6 to the first resistor R7 and the ratio of the fourth resistor R10 to the third resistor R8. The two output waveforms of the output pins VOUT+ and VOUT- of the fully differential operational amplifier U2 are 180° out of phase and symmetrical with the voltage of the reference voltage VREF. They are connected to the first output protection circuit 403 and the second output protection circuit 404 respectively, thereby completing the process of converting the input single-ended signal into a pair of differential signals.

[0096] Furthermore, Figure 4is a schematic diagram of the structure of a first output protection circuit in an output unit provided by an embodiment of the present invention, see Figure 4 The first output protection circuit 403 includes: a first operational amplifier U1, a third capacitor C4, a fourth capacitor C1, a fifth capacitor C8, a first DC circuit 4031, a second DC circuit 4032, a third DC circuit 4033, an output current limiting circuit 4034, an input current limiting circuit 4035, a clamping protection circuit 4036, an undervoltage protection circuit 4037, an overvoltage protection circuit 4038, an eleventh diode D5, a twelfth diode D15, a first amplifying transistor Q2, and a second amplifying transistor Q5;

[0097] The non-inverting input terminal of the first operational amplifier U1 is connected to the common terminal of the second toggle switch S2, and the output terminal of the first operational amplifier U1 is connected to the inverting input terminal of the first operational amplifier U1 via the third capacitor C4;

[0098] One end of the third capacitor C4 is connected to the output end of the first operational amplifier U1, and the other end is connected to the inverting input end of the first operational amplifier U1;

[0099] One end of the fourth capacitor C1 is grounded, and the other end is connected to the input end of the first DC circuit 4031;

[0100] The first DC circuit 4031 includes a first diode D1, a second diode D11 and a fifth resistor R3, wherein the anode of the first diode D1 is connected to the power supply terminal, the cathode of the first diode D1 is connected to the anode of the second diode D11, the cathode of the second diode D11 is connected to one end of the fifth resistor R3, and the other end of the fifth resistor R3 is grounded;

[0101] One end of the fifth capacitor R3 is grounded, and the other end is connected to the input end of the second DC circuit 4032;

[0102] The second DC circuit 4032 includes a third diode D9, a fourth diode D13 and a sixth resistor R13, wherein the cathode of the fourth diode D13 is connected to the power supply terminal, the anode of the fourth diode D13 is connected to the cathode of the third diode D9, the anode of the third diode D9 is connected to one end of the sixth resistor R13, and the other end of the sixth resistor R13 is grounded;

[0103] The third DC circuit 4033 includes a fifth diode D3, a sixth diode D4, a seventh diode D12, an eighth diode D7, a seventh resistor R1, an eighth resistor R14, a first transistor Q1 and a second transistor Q6, one end of the seventh resistor R1 is connected to one end of the fourth capacitor C1 and the anode of the first diode D1, the other end of the seventh resistor R1 is connected to the first end of the first transistor Q1, the base of the first transistor Q1 is connected to the cathode of the second diode D11 and one end of the fifth resistor R3, the second end of the first transistor Q1 is connected to the anode of the fifth diode D3, and the fifth diode D3 is connected to the cathode of the second diode D11 and one end of the fifth resistor R3. The cathode of the sixth diode D4 is connected to the anode of the seventh diode D12 and the output end of the first operational amplifier U1, the cathode of the seventh diode D12 is connected to the anode of the eighth diode D7, the cathode of the eighth diode D7 is connected to the first end of the second triode Q6, the base of the second triode Q6 is connected to one end of the sixth resistor R13 and the anode of the third diode D9, the second end of the second triode Q6 is connected to one end of the eighth resistor R14, and the other end of the eighth resistor R14 is connected to one end of the fifth capacitor C8 and the cathode of the fourth diode D13;

[0104] The clamp protection circuit 4036 includes a ninth diode D6 and a tenth diode D14, wherein the cathode of the ninth diode D6 is connected to the positive terminal of the power supply, the anode of the ninth diode D6 is connected to the cathode of the tenth diode D14 and the inverting input terminal of the first operational amplifier U1, and the anode of the tenth diode D14 is connected to the negative terminal of the power supply;

[0105] The output current limiting circuit 4034 includes a third triode Q3, a ninth resistor R4 and a tenth resistor R5, wherein a first end of the third triode Q3 is connected to a second end of the first triode Q1 and a base of the first amplifying transistor Q2, a second end of the third triode Q3 is connected to one end of the tenth resistor R5 and an anode of the eleventh diode D5, a base of the third triode Q3 is connected to one end of the ninth resistor R4, and the other end of the ninth resistor R4 is connected to one end of the tenth resistor R5 and a second end of the first amplifying transistor Q2;

[0106] The input current limiting circuit 4035 includes a fourth transistor Q4, an eleventh resistor R12 and a twelfth resistor R9, a first end of the fourth transistor Q4 is connected to a first end of the second transistor Q6 and a base of the second amplifying transistor Q5, a second end of the fourth transistor Q4 is connected to one end of the twelfth resistor R9 and a cathode of a twelfth diode D15, a base of the fourth transistor Q4 is connected to one end of the eleventh resistor R12, and the other end of the eleventh resistor R12 is connected to one end of the twelfth resistor R9 and a first end of the second amplifying transistor Q5;

[0107] The undervoltage protection circuit 4037 includes a first voltage stabilizing diode D2 and a thirteenth resistor R2, wherein the anode of the first voltage stabilizing diode D2 is connected to the base of the third triode Q3, the cathode of the first voltage stabilizing diode D2 is connected to one end of the thirteenth resistor R2, and the other end of the thirteenth resistor R2 is connected to the first end of the first amplifying transistor Q2;

[0108] The overvoltage protection circuit 4038 includes a second voltage stabilizing diode D8 and a fourteenth resistor R15, wherein the cathode of the second voltage stabilizing diode D8 is connected to the base of the fourth transistor Q4, the anode of the second voltage stabilizing diode D8 is connected to one end of the fourteenth resistor R15, and the other end of the fourteenth resistor R15 is connected to the second end of the second amplifying transistor Q5;

[0109] The structure of the second output protection circuit 404 is the same as that of the first output protection circuit 403 .

[0110] Specifically, the third capacitor C4 is used to perform phase compensation on the first operational amplifier U1, thereby making the output of the first operational amplifier U1 more accurate and stable; the fourth capacitor C1 and the fifth capacitor C8 are used to filter noise from the power supply.

[0111] The first diode D1, the second diode D11 and the fifth resistor R3 form a first DC circuit 4031 between the positive electrode AVCC+15V output from the power supply unit 500 and AGND. The DC current of the DC circuit forms a voltage drop between the first diode D1 and the second diode D11, so that the base of the first transistor Q1 has a constant voltage.

[0112] The third diode D9, the fourth diode D13 and the sixth resistor R13 form a second DC circuit 4032 between AGND output from the power supply unit 500 and the negative electrode AVCC-15V. The DC current of the DC circuit forms a voltage drop between the third diode D9 and the fourth diode D13, so that the base of the second transistor Q6 has a constant voltage.

[0113] The fifth diode D3, the sixth diode D4, the seventh diode D12, the eighth diode D7, the seventh resistor R1, the eighth resistor R14, the first transistor Q1 and the second transistor Q6 constitute a third DC circuit 4033 between the positive electrode AVCC+15V and the negative electrode AVCC-15V output from the power supply unit 500. According to the different output voltages of the first operational amplifier U1, the collector voltages of the first transistor Q1 and the second transistor Q6 will be different. The collector voltage of the first transistor Q1 is always higher than the output voltage of the first operational amplifier U1 by two diode drops, and the collector voltage of the second transistor Q6 is always lower than the output voltage of the first operational amplifier U1 by two diode drops. When the output voltage of the first operational amplifier U1 is greater than 0V, the first amplifying transistor Q2 is turned on and the second amplifying transistor Q5 is turned off. When the output voltage of the first operational amplifier U1 is less than 0V, the second amplifying transistor Q5 is turned on and the first amplifying transistor Q2 is turned off.

[0114] When the output current exceeds a certain value, the voltage drop across the tenth resistor R5 in the output current limiting circuit 4034 turns on the third transistor Q3, absorbing the base current of the first amplifying transistor Q2. The ninth resistor R4 is the base current limiting resistor of the third transistor Q3.

[0115] When the input current exceeds a certain value, the voltage drop on the twelfth resistor R9 of the input current limiting circuit 4035 turns on the fourth transistor Q4, absorbing the base current of the second amplifier transistor Q5. The eleventh resistor R12 is the base current limiting resistor of the fourth transistor Q4.

[0116] When the voltage at the reverse input terminal of the first operational amplifier U1 exceeds a certain range of the positive power supply voltage AVCC+15V, the ninth diode D6 in the clamping protection circuit 4036 will be turned on to limit the input signal within the clamping level range, thereby protecting the operational amplifier chip. When the voltage at the reverse input terminal of the first operational amplifier U1 exceeds a certain range of the negative power supply voltage AVCC-15V, the tenth diode D14 in the clamping protection circuit 4036 will also be turned on to raise the input signal to within the clamping level range, thereby preventing the operational amplifier chip from being affected by undervoltage.

[0117] When the negative voltage at the reverse input terminal of the first operational amplifier U1, i.e., the output terminal of the first output protection circuit 403, exceeds a certain range, the eleventh diode D5 is turned on, the twelfth diode D15 is turned off, and the first voltage regulator diode D2 in the undervoltage protection circuit 4037 stabilizes the voltage within a certain range, forming a current loop with the thirteenth resistor R2, and the thirteenth resistor R2 is a current limiting resistor.

[0118] When the positive voltage at the reverse input terminal of the first operational amplifier U1, i.e., the output terminal of the first output protection circuit 403, exceeds a certain range, the eleventh diode D5 is cut off, the twelfth diode D15 is turned on, and the second voltage regulator diode D8 in the overvoltage protection circuit 4038 stabilizes the voltage within a certain range, forming a current loop with the fourteenth resistor R15, and the fourteenth resistor R15 is a current limiting resistor.

[0119] Furthermore, Figure 5 is a schematic diagram of the structure of a first transformer circuit in an output unit provided in an embodiment of the present invention, see Figure 5 , the first transformer circuit 405 includes: a first transformer T1 and a first fuse F1;

[0120] One end of the input side of the first transformer T1 is connected to the normally closed contact of the fourth slide switch S4, and the other end is grounded. One end of the output side of the first transformer T1 is connected to one end of the first fuse F1, and the other end of the first fuse F1 is connected to the normally open contact of the fourth slide switch S4 as the positive end of the differential output. The other end of the output side of the first transformer T1 is the negative end of the differential output. The positive end of the differential output and the negative end of the differential output are connected to the ECU controller.

[0121] The structure of the second transformer circuit 406 is the same as that of the first transformer circuit 405 .

[0122] Specifically, when the working mode is the rotary transformer type motor position sensor simulation output mode, the common end of the fourth toggle switch S4 is connected to the normally closed contact, and the input signal becomes a differential signal after reaching the first transformer T1, and is output to the ECU controller after passing through the first fuse F1 connected in series. When the current in the circuit increases abnormally, the first fuse F1 will melt due to overheating, thereby cutting off the current and protecting the safe operation of the circuit. When the abnormal overcurrent fault is cleared, the conductive path will be restored.

[0123] When the working mode is the eddy current motor position sensor simulation output mode, the common end of the fourth toggle switch S4 is connected to the normally open contact and is directly connected to the ECU controller as the positive end of the output.

[0124] Furthermore, Figure 6 Schematic diagram of the structure of the input unit of a rotary transformer and eddy current position sensor simulation board provided by the embodiment of the present invention, see Figure 6 , the input unit 300 includes: a second transformer T2, a second fuse F2, a fifteenth resistor R18, a sixteenth resistor R21, a seventeenth resistor R25, an eighteenth resistor R27, a nineteenth resistor R26, a sixth capacitor C14, a fifteenth diode D10, a common-direction amplifier circuit 301, a third operational amplifier U4, and a hysteresis comparator U5;

[0125] One end of the input side of the second transformer T2 is connected to one end of the second fuse F2, the other end of the second fuse F2 is connected to the ECU controller, the other end of the input side of the second transformer T2 is connected to the ECU controller, and the output side of the second transformer T2 is connected to the same-direction amplifier circuit 301.

[0126] The non-inverting amplifier circuit 301 includes a twentieth resistor R17, a twenty-first resistor R16, a twenty-second resistor R19, a twenty-third resistor R24, a sixth slide switch S6 and a second operational amplifier U3, one end of the twentieth resistor R17 is connected to one end of the output side of the second transformer T2, the other end of the twentieth resistor R17 is connected to one end of the twenty-first resistor R16 and the non-inverting input end of the second operational amplifier U3, the other end of the twenty-first resistor R16 is grounded, one end of the twenty-second resistor R19 is connected to the other end of the output side of the second transformer T2 and is grounded, the other end of the twenty-second resistor R19 is connected to one end of the twenty-third resistor R24 ​​and the inverting input end of the second operational amplifier U3, and the other end of the twenty-third resistor is connected to the output end of the second operational amplifier U3 and the normally closed contact of the sixth slide switch S6; the sixth capacitor C14 is arranged in parallel with the twenty-third resistor R24.

[0127] The non-inverting input terminal of the third operational amplifier U4 is connected to the common terminal of the sixth slide switch S6 and the input reference pin of the digital-to-analog converter 401, the normally open contact of the sixth slide switch S6 is connected to the reference voltage, and the inverting input terminal of the third operational amplifier U4 is connected to the output terminal of the third operational amplifier U4 and the anode of the fifteenth diode D10.

[0128] The cathode of the fifteenth diode D10 is connected to one end of the fifteenth resistor R18, the other end of the fifteenth resistor R18 is connected to one end of the sixteenth resistor R21 and the inverting input end of the hysteresis comparator U5, and the other end of the sixteenth resistor R21 is grounded.

[0129] The non-inverting input terminal of the hysteresis comparator U5 is connected to one end of the seventeenth resistor R25, one end of the eighteenth resistor R27 and one end of the nineteenth resistor R26. The other end of the seventeenth resistor R25 is connected to the power supply, the other end of the eighteenth resistor R27 is grounded, and the other end of the nineteenth resistor R26 is connected to the output terminal of the hysteresis comparator U5 and the second input terminal of the FPGA 200.

[0130] Specifically, the input unit 300 works in the rotary transformer type motor position sensor simulation output mode, and the Sense+ / Sense- signal at the input end is the excitation signal from the ECU controller. The amplification factor of the same-direction amplifier circuit 301 is determined by the ratio of the twenty-third resistor R24 ​​to the twenty-second resistor R19, the ratio of the twentieth resistor R17 to the twenty-first resistor R16. The sixth capacitor C14 is arranged in parallel with the twenty-third resistor R24 ​​to perform phase compensation on the second operational amplifier U3, thereby making the output of the second operational amplifier U3 more accurate and stable.

[0131] When the reference voltage of the digital-to-analog converter 401 uses an external reference, the common end of the sixth slide switch S6 is connected to the normally closed contact, that is, the output end of the second operational amplifier U3; when the reference voltage of the digital-to-analog converter 401 uses an internal reference, the common end of the sixth slide switch S6 is connected to the normally open contact, that is, the reference base voltage REF10V.

[0132] The non-inverting input terminal of the third operational amplifier U4 is connected to the common terminal of the sixth toggle switch S6, and the reverse input terminal is connected to the output terminal of the third operational amplifier U4, forming a voltage follower circuit, improving the input impedance, and isolating the mutual influence between the front and rear stage circuits.

[0133] The fifteenth diode D10 is connected to the output of the third operational amplifier U4, and can convert the alternating current into a single-direction pulse direct current. The cathode of the fifteenth diode D10 is connected to the fifteenth resistor R18, and the fifteenth resistor R18 is connected in series with the sixteenth resistor R21, and the voltage signal is proportionally reduced and connected to the reverse input end of the hysteresis comparator U5. The two threshold voltages of the hysteresis comparator U5 are set by the proportional relationship of the seventeenth resistor R25, the eighteenth resistor R27, and the nineteenth resistor R26; the pulse output end of the hysteresis comparator U5 is connected to the FPGA 200.

[0134] For further information, see Figure 1 The sensor simulation board also includes: a power supply unit 500 and an isolated power supply unit 600; the input end of the power supply unit 500 is connected to the output end of the isolated power supply unit 600, and the output end of the power supply unit 500 is respectively connected to the interface circuit 100, the FPGA 200, the input unit 300 and the output unit 400. The power supply unit 500 is used to supply power to the sensor simulation board, and the isolated power supply unit 600 is used to isolate the power supply unit 500.

[0135] In the embodiment of the present invention, the interface circuit communicates with the host computer, receives the configuration instruction sent by the host computer, and sends it to the FPGA, and the FPGA generates a control signal and a rotary transformer type signal, or a control signal and an eddy current type signal according to the configuration instruction and the excitation signal collected by the input unit; the output unit processes the rotary transformer type signal according to the control signal and outputs it through an isolation transformer, or the output unit processes the eddy current type signal according to the control signal and outputs it to the ECU controller. Since the configuration instruction includes the sensor state parameter configuration instruction, the rotary transformer and eddy current position sensor simulation board provided by the present solution can realize the test simulation of normal and abnormal conditions of the ECU in two different sensor simulation modes using one sensor simulation board, shortening the R&D and testing cycle, improving efficiency, and reducing costs.

[0136] It should be noted that the terms used in the present invention are only for describing specific embodiments, rather than limiting the scope of the present application. As shown in the present specification, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular, but may also include the plural. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of more restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0137] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. Rotary transformer and eddy current position sensor simulation board, characterized in that: The rotary transformer and eddy current position sensor simulation board includes a rotary transformer type motor position sensor simulation output mode and an eddy current type motor position sensor simulation output mode; The sensor simulation board includes: an interface circuit, an FPGA, an input unit and an output unit; The interface circuit is used to communicate with the host computer and receive configuration instructions sent by the host computer; The first input terminal of the FPGA is connected to the interface circuit, the second input terminal of the FPGA is connected to the first output terminal of the input unit, and the output terminal of the FPGA is connected to the first input terminal of the output unit; The input end of the input unit is connected to the ECU controller, and the second output end of the input unit is connected to the second input end of the output unit; the output unit includes: a digital-to-analog converter, a single-ended to differential circuit, a first output protection circuit, a second output protection circuit, a first transformer circuit, a second transformer circuit, a first toggle switch, a second toggle switch, a third toggle switch, a fourth toggle switch and a fifth toggle switch; the output unit is used to switch the rotary transformer type motor position sensor simulation output mode or the eddy current type motor position sensor simulation output mode according to the configuration instruction; When the rotary transformer and eddy current position sensor simulation board is in the rotary transformer type motor position sensor simulation output mode, the single-ended to differential circuit is not connected in series with the circuit; When the rotary transformer and eddy current position sensor simulation board is in the eddy current motor position sensor simulation output mode, the first transformer circuit and the second transformer circuit are not connected in series with the circuit; The output end of the output unit is connected to the ECU controller; The single-ended to differential circuit comprises: a first resistor, a second resistor, a third resistor, a fourth resistor, a fully differential operational amplifier, a first capacitor and a second capacitor; One end of the first resistor is connected to the normally open contact of the first toggle switch, and the other end is connected to the positive input terminal of the fully differential operational amplifier and the second resistor; One end of the second resistor is connected to the positive input terminal of the fully differential operational amplifier, and the other end is connected to the negative output terminal of the fully differential operational amplifier and the normally open contact of the third toggle switch; One end of the third resistor is grounded, and the other end is connected to the negative input terminal of the fully differential operational amplifier and the fourth resistor; One end of the fourth resistor is connected to the negative input terminal of the fully differential operational amplifier, and the other end is connected to the positive output terminal of the fully differential operational amplifier and the normally open contact of the second toggle switch; One end of the first capacitor is grounded, and the other end is connected to the power supply pin of the fully differential operational amplifier; One end of the second capacitor is grounded, and the other end is connected to the output common mode voltage pin of the fully differential operational amplifier; The first output protection circuit includes: a first operational amplifier, a third capacitor, a fourth capacitor, a fifth capacitor, a first DC circuit, a second DC circuit, a third DC circuit, an output current limiting circuit, an input current limiting circuit, a clamping protection circuit, an undervoltage protection circuit, an overvoltage protection circuit, an eleventh diode, a twelfth diode, a first amplifying transistor, and a second amplifying transistor; The non-inverting input terminal of the first operational amplifier is connected to the common terminal of the second toggle switch, and the output terminal of the first operational amplifier is connected to the inverting input terminal of the first operational amplifier through the third capacitor; One end of the third capacitor is connected to the output end of the first operational amplifier, and the other end is connected to the inverting input end of the first operational amplifier; One end of the fourth capacitor is grounded, and the other end is connected to the input end of the first DC circuit; The first DC circuit includes a first diode, a second diode and a fifth resistor, the anode of the first diode is connected to the power supply terminal, the cathode of the first diode is connected to the anode of the second diode, the cathode of the second diode is connected to one end of the fifth resistor, and the other end of the fifth resistor is grounded; One end of the fifth capacitor is grounded, and the other end is connected to the input end of the second DC circuit; The second DC circuit includes a third diode, a fourth diode and a sixth resistor, the cathode of the fourth diode is connected to the power supply terminal, the anode of the fourth diode is connected to the cathode of the third diode, the anode of the third diode is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded; The third DC circuit includes a fifth diode, a sixth diode, a seventh diode, an eighth diode, a seventh resistor, an eighth resistor, a first transistor and a second transistor, one end of the seventh resistor is connected to one end of the fourth capacitor and the anode of the first diode, the other end of the seventh resistor is connected to the first end of the first transistor, the base of the first transistor is connected to the cathode of the second diode and one end of the fifth resistor, the second end of the first transistor is connected to the anode of the fifth diode, the cathode of the fifth diode is connected to the anode of the sixth diode, the cathode of the sixth diode is connected to the anode of the seventh diode and the output end of the first operational amplifier, the cathode of the seventh diode is connected to the anode of the eighth diode, the cathode of the eighth diode is connected to the first end of the second transistor, the base of the second transistor is connected to one end of the sixth resistor and the anode of the third diode, the second end of the second transistor is connected to one end of the eighth resistor, and the other end of the eighth resistor is connected to one end of the fifth capacitor and the cathode of the fourth diode; The clamp protection circuit comprises a ninth diode and a tenth diode, the cathode of the ninth diode is connected to the positive end of the power supply, the anode of the ninth diode is connected to the cathode of the tenth diode and the inverting input end of the first operational amplifier, and the anode of the tenth diode is connected to the negative end of the power supply; The output current limiting circuit includes a third triode, a ninth resistor and a tenth resistor, wherein a first end of the third triode is connected to a second end of the first triode and a base of the first amplifying transistor, a second end of the third triode is connected to one end of the tenth resistor and an anode of the eleventh diode, a base of the third triode is connected to one end of the ninth resistor, and the other end of the ninth resistor is connected to one end of the tenth resistor and a second end of the first amplifying transistor; The input current limiting circuit includes a fourth transistor, an eleventh resistor and a twelfth resistor, wherein a first end of the fourth transistor is connected to a first end of the second transistor and a base of the second amplifying transistor, a second end of the fourth transistor is connected to one end of the twelfth resistor and a cathode of the twelfth diode, a base of the fourth transistor is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to one end of the twelfth resistor and a first end of the second amplifying transistor; The undervoltage protection circuit includes a first voltage stabilizing diode and a thirteenth resistor, wherein the anode of the first voltage stabilizing diode is connected to the base of the third transistor, the cathode of the first voltage stabilizing diode is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the first end of the first amplifying transistor; The overvoltage protection circuit includes a second voltage stabilizing diode and a fourteenth resistor, wherein the cathode of the second voltage stabilizing diode is connected to the base of the fourth transistor, the anode of the second voltage stabilizing diode is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the second end of the second amplifying transistor; The structure of the second output protection circuit is the same as that of the first output protection circuit; The first transformer circuit comprises: a first transformer and a first fuse; One end of the input side of the first transformer is connected to the normally closed contact of the fourth slide switch, and the other end is grounded; one end of the output side of the first transformer is connected to one end of the first fuse, and the other end of the first fuse is connected to the normally open contact of the fourth slide switch as the positive end of the differential output; the other end of the output side of the first transformer is the negative end of the differential output, and the positive end of the differential output and the negative end of the differential output are connected to the ECU controller; The structure of the second transformer circuit is the same as that of the first transformer circuit; The input unit includes: a second transformer, a second fuse, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a sixth capacitor, a fifteenth diode, a common-direction amplifier circuit, a third operational amplifier, and a hysteresis comparator; the input unit works in a rotary transformer type motor position sensor simulation output mode, and the Sense+ / Sense- signal at the input end is an excitation signal from an ECU controller; One end of the input side of the second transformer is connected to one end of the second fuse, the other end of the second fuse is connected to the ECU controller, the other end of the input side of the second transformer is connected to the ECU controller, and the output side of the second transformer is connected to the same-direction amplifier circuit; The in-phase amplifier circuit includes a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a sixth slide switch and a second operational amplifier, one end of the twentieth resistor is connected to one end of the output side of the second transformer, the other end of the twentieth resistor is connected to one end of the twenty-first resistor and the non-inverting input end of the second operational amplifier, the other end of the twenty-first resistor is grounded, one end of the twenty-second resistor is connected to the other end of the output side of the second transformer and is grounded, the other end of the twenty-second resistor is connected to one end of the twenty-third resistor and the inverting input end of the second operational amplifier, and the other end of the twenty-third resistor is connected to the output end of the second operational amplifier and the normally closed contact of the sixth slide switch; The sixth capacitor is connected in parallel with the twenty-third resistor; The non-inverting input terminal of the third operational amplifier is connected to the common terminal of the sixth slide switch and the input reference pin of the digital-to-analog converter, the normally open contact of the sixth slide switch is connected to the reference voltage, and the inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier and the anode of the fifteenth diode; The cathode of the fifteenth diode is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is connected to one end of the sixteenth resistor and the inverting input end of the hysteresis comparator, and the other end of the sixteenth resistor is grounded; The non-inverting input terminal of the hysteresis comparator is connected to one end of the seventeenth resistor, one end of the eighteenth resistor and one end of the nineteenth resistor, the other end of the seventeenth resistor is connected to the power supply, the other end of the eighteenth resistor is grounded, and the other end of the nineteenth resistor is connected to the output terminal of the hysteresis comparator and the second input terminal of the FPGA.

2. The rotary transformer and eddy current position sensor simulation board according to claim 1, characterized in that: When the rotary transformer and eddy current position sensor simulation board is in the rotary transformer type motor position sensor simulation output mode, the single-ended to differential circuit is not connected in series with the circuit, specifically including: The input end of the digital-to-analog converter is connected to the output end of the FPGA and the second output end of the input unit, the first output end of the digital-to-analog converter is connected to the common end of the first toggle switch, and the second output end of the digital-to-analog converter is connected to the normally closed contact of the third toggle switch; The normally closed contact of the first toggle switch is connected to the normally closed contact of the second toggle switch, the first toggle switch is connected to the normally closed contact, and the second toggle switch is connected to the normally closed contact; The input end of the first output protection circuit is connected to the common end of the second slide switch, the output end of the first output protection circuit is connected to the common end of the fourth slide switch, and the fourth slide switch is connected to a normally closed contact; The input end of the first transformer circuit is connected to the normally closed contact of the fourth toggle switch, and the output end of the first transformer is connected to the ECU controller; The input end of the second output protection circuit is connected to the common end of the third slide switch, the output end of the second output protection circuit is connected to the common end of the fifth slide switch, and the fifth slide switch is connected to a normally closed contact; The input end of the second transformer circuit is connected to the normally closed contact of the fifth toggle switch, and the output end of the second transformer is connected to the ECU controller.

3. The rotary transformer and eddy current position sensor simulation board according to claim 1, characterized in that: When the rotary transformer and eddy current position sensor simulation board is in the eddy current motor position sensor simulation output mode, the first transformer circuit and the second transformer circuit are not connected in series, specifically including: The input end of the digital-to-analog converter is connected to the output end of the FPGA and the second output end of the input unit, the first output end of the digital-to-analog converter is connected to the common end of the first toggle switch, and the first toggle switch is connected to a normally open contact; The input end of the single-ended to differential circuit is connected to the normally open contact of the first toggle switch, the first output end of the single-ended to differential circuit is connected to the normally open contact of the second toggle switch, and the second output end of the single-ended to differential circuit is connected to the normally open contact of the third toggle switch; the second toggle switch is connected to the normally open contact, and the third toggle switch is connected to the normally open contact; The input end of the first output protection circuit is connected to the common end of the second slide switch, the output end of the first output protection circuit is connected to the common end of the fourth slide switch, the fourth slide switch is connected to a normally open contact, and the normally open contact of the fourth slide switch is connected to the ECU controller; The input end of the second output protection circuit is connected to the common end of the third toggle switch, the output end of the second output protection circuit is connected to the common end of the fifth toggle switch, the fifth toggle switch is connected to the normally open contact, and the normally open contact of the fifth toggle switch is connected to the ECU controller.

4. The rotary transformer and eddy current position sensor simulation board according to claim 1, characterized in that: The sensor simulation board also includes: a power supply unit and an isolation power supply unit; The input end of the power supply unit is connected to the output end of the isolation power supply unit, and the output end of the power supply unit is respectively connected to the interface circuit, the FPGA, the input unit and the output unit.

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