Angular displacement sensor circuit
By introducing a phase-sensitive rectifier module and a temperature compensation module into the angular displacement sensor circuit, the problem of low detection accuracy caused by environmental interference is solved, and higher detection accuracy and anti-interference ability are achieved.
Patent Information
- Application Number
- CN202420533713.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-03-19
AI Technical Summary
During the angular displacement detection process, various interferences in the environment can easily interfere with the transmission of the output signal, resulting in a low detection accuracy of the angular displacement sensor.
The circuit design is adopted including an angular displacement sensor, a phase-sensitive rectifier module, a temperature compensation module, a signal processing module and an amplification and adjustment module. The phase-sensitive rectifier module converts the received electrical signals into high-precision voltage signals, and performs temperature compensation through the temperature compensation module, improving the anti-interference ability and detection accuracy of the circuit.
Through this circuit design, the detection accuracy of the angular displacement sensor is improved, the resistance to environmental interference is enhanced, and signal loss during transmission is effectively avoided.
Smart Images
Figure CN222747953U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of sensors, and in particular to an angular displacement sensor circuit. Background Art
[0002] With the development of science and technology, angular displacement sensors have been widely used in various fields. Angular displacement sensors adopt non-contact design. Compared with other traditional angular displacement measuring instruments such as synchronous analyzers and potentiometers, angular displacement sensors effectively improve long-term reliability and are widely used in industrial automation measurement and monitoring systems, especially in occasions with frequent mechanical changes, harsh environments, and requirements for long sensor service life and high reliability, such as aviation, electronics, machinery, textiles, ships, metallurgy and other industries. Angular displacement sensors have strong environmental applicability and can be used in harsh industrial environments such as water, oil, steam, dust, high and low temperature, vibration and shock.
[0003] An angular displacement sensor uses a specially shaped rotor and a wire-wound coil to generate a linear output signal through the rotation of the rotor shaft. However, during the angular displacement detection process, various interferences in the environment can easily interfere with the transmission of the output signal, resulting in low detection accuracy of the angular displacement sensor. Utility Model Content
[0004] In order to improve the detection accuracy of angular displacement, the present application provides an angular displacement sensor circuit.
[0005] The present application provides an angular displacement sensor circuit, which adopts the following technical solution:
[0006] The angular displacement sensor circuit comprises: an angular displacement sensor, a phase-sensitive rectifier module, a temperature compensation module, a signal processing module and an amplification adjustment module; the output end of the angular displacement sensor is coupled to the input end of the phase-sensitive rectifier module, and the input end of the angular displacement sensor is coupled to the output end of the amplification adjustment module; the phase-sensitive rectifier module comprises a first output end and a second output end, the first output end of the phase-sensitive rectifier module is coupled to the input end of the signal processing module, the second output end of the phase-sensitive rectifier module is coupled to the temperature compensation module, and the output end of the signal processing module is coupled to the input end of the amplification adjustment module;
[0007] The angular displacement sensor is used to generate a corresponding electrical signal based on the angular displacement of the part to be measured, and output the electrical signal to the phase-sensitive rectifier module;
[0008] The phase-sensitive rectification module is used to convert the received electrical signal into a voltage signal, and transmit the voltage signal to the signal processing module and the temperature compensation module respectively;
[0009] The signal processing module is used to calculate and logically arrange the voltage signal to obtain a control signal to control the angular displacement of the part to be measured.
[0010] By adopting the above technical solution, after the angular displacement sensor detects the deflection of the part to be measured, it sends an electrical signal to the phase-sensitive rectifier module. The phase-sensitive rectifier module integrates the electrical signal and outputs the corresponding voltage signal and adjusts the deviation of the voltage signal; at the same time, the phase-sensitive rectifier module transmits the adjusted voltage signal to the signal processing module, and the signal processing module transmits the voltage signal to the amplification and adjustment module. The amplification and adjustment module receives the voltage signal and amplifies it to output a control signal, which is transmitted to the angular displacement sensor so that the angular displacement sensor controls the movement of the part to be measured. The phase-sensitive sorting module is used in the entire circuit. The phase-sensitive rectifier module converts the received electrical signal into a high-precision voltage signal, which is then output after temperature compensation by the temperature compensation module. The setting of the phase-sensitive rectifier module improves the anti-interference ability of the circuit, effectively avoids the signal loss during the transmission process, and greatly improves the detection accuracy of the angular displacement.
[0011] Optionally, the angular displacement sensor includes a ring-shaped coil L1 and a rotor coil L2 rotatably disposed in the ring-shaped coil L1, the rotor coil L2 is used to couple with the part to be measured, the two ends of the ring-shaped coil L1 are coupled to the phase-sensitive rectifier module, and the two ends of the rotor coil L2 are also coupled to the phase-sensitive rectifier module.
[0012] Optionally, the phase-sensitive rectifier module includes a phase-sensitive rectifier chip, a resistor R1, a resistor R2, a resistor R3, a potentiometer R01, a transformer, a diode D11 and a diode D10, the phase-sensitive rectifier chip includes a power pin P1, a first sampling pin P3, a second sampling pin P5, an output pin P2, a reference voltage pin P13 and a first ground pin P12, and the transformer includes a primary coil L3 and a secondary coil L4;
[0013] The first end of the rotor coil L2 is grounded, the second end of the rotor coil L2 is coupled to the first end of the resistor R1, and the second end of the resistor R1 is coupled to the reference voltage pin P13;
[0014] A first end of the loop coil L1 is coupled to the first sampling pin P3, and a second end of the loop coil L1 is coupled to the second sampling pin P2;
[0015] The first end of the resistor R2 is coupled to the output pin P2, the second end of the resistor R2 is coupled to the first end of the resistor R3, and the second end of the resistor R3 is coupled to the first end of the potentiometer;
[0016] The cathode of the diode D11 is coupled to the first ground pin P12, the anode of the diode D11 is coupled to the anode of the external power supply, the anode of the diode D10 is coupled to the power pin P1, and the cathode of the diode D10 is coupled to the cathode of the external power supply.
[0017] Optionally, the temperature compensation module includes a potentiometer R02, a potentiometer R03, a thermistor R4, a thermistor R5, an inductor L5, a capacitor C2 and a capacitor C3;
[0018] The first end of the thermistor R4 is coupled to the second end of the potentiometer R01, the second end of the thermistor R4 is coupled to the second end of the potentiometer R02, and the first end of the potentiometer R02 is coupled to the first end of the thermistor R4;
[0019] The first end of the thermistor R5 is coupled to the second end of the potentiometer R03, the second end of the thermistor R5 is coupled to the first end of the inductor L5, and the first end of the potentiometer R03 is coupled to the second end of the thermistor R5;
[0020] The positive electrode of the capacitor C2 is coupled to the second end of the inductor L5 , the negative electrode of the capacitor C2 is coupled to the negative electrode of the capacitor C3 , and the positive electrode of the capacitor C3 is coupled to the first end of the primary coil L3 .
[0021] By adopting the above technical solution, since the inductor L5 has a certain inductive reactance, when the voltage signal is output after being compensated by the temperature compensation module, the voltage signal output by the temperature compensation module is relatively unstable. By setting the inductor L5, the voltage signal of the temperature compensation module can be output stably.
[0022] Optionally, the amplification adjustment module includes a transistor V3, a transistor V6, a transistor V7, a transistor V9, a diode D3, a diode D4, a diode D5, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26 and a resistor R27;
[0023] The anode of the diode D4 is coupled to the output end of the signal processing module, and the anode of the diode D5 and the base of the transistor V7 are both coupled to the cathode of the diode D4;
[0024] The cathode of the diode D3 is coupled to the anode of the diode D4, the first end of the resistor R22 and the base of the transistor V6 are both coupled to the anode of the diode D3, and the cathode of the diode D5 is coupled to the base of the transistor V6;
[0025] The second end of the resistor R22 is coupled to the first end of the resistor R24, the collector of the transistor V6 and the collector of the transistor V3 are both coupled to the second end of the resistor R24, the emitter of the transistor V6 is coupled to the base of the transistor V3, the emitter of the transistor V3 is coupled to the first end of the resistor R25, and the second end of the resistor R25 is coupled to the first end of the resistor R26;
[0026] The emitter of the transistor V7 and the collector of the transistor V9 are both coupled to the second end of the resistor R26, the collector of the transistor V7 is coupled to the base of the transistor V9, the emitter of the transistor V9 is coupled to the first end of the resistor R27, the second end of the resistor R27 is coupled to the first end of the resistor R23, and the second end of the resistor R23 is coupled to the base of the transistor V7.
[0027] By adopting the above technical solution, when the collector of the transistor V6 receives a high-level signal, the transistor V6 and the transistor V3 are in a conducting state, the transistor V7 and the transistor V9 are in a non-conducting state, and the signal processing module transmits the voltage signal to the primary coil through the transistor V6 and the transistor V3. After the signal is coupled by the transformer, the action of the part to be tested is controlled; when the collector of the transistor V6 receives a low-level signal, the transistor V7 and the transistor V9 are in a conducting state, the transistor V3 and the transistor V6 are in a non-conducting state, and the signal processing module transmits the voltage signal to the phase-sensitive rectifier chip through the transistor V7 and the transistor V9 to control the action of the part to be tested; wherein the resistor R22, the resistor R23, the resistor R24, the resistor R25, the resistor R26 and the resistor R27 are used for voltage division and current limiting to ensure the normal operation of the transistor V3, the transistor V6, the transistor V7 and the transistor V9 in the module.
[0028] Optionally, the phase-sensitive rectification module further includes a capacitor C3, a positive electrode of the capacitor C3 is coupled between the first end of the resistor R2 and the output pin P2, and a negative electrode of the capacitor C3 is grounded.
[0029] By adopting the above technical solution, the voltage signal output from the output 2 pin P2 is filtered by setting the capacitor C3, which has an anti-interference effect, so that the voltage signal output from the output pin P2 of the phase-sensitive rectifier chip can be output smoothly.
[0030] In summary, the present application includes at least one of the following beneficial effects:
[0031] 1. After the angular displacement sensor detects the deflection of the part to be measured, it sends an electrical signal to the phase-sensitive rectifier module. The phase-sensitive rectifier module integrates the electrical signal and outputs the corresponding voltage signal and adjusts the deviation of the voltage signal. At the same time, the phase-sensitive rectifier module transmits the adjusted voltage signal to the signal processing module, and the signal processing module transmits the voltage signal to the amplification and adjustment module. The amplification and adjustment module receives the voltage signal and amplifies it, then outputs a control signal. The control signal is transmitted to the angular displacement sensor, so that the angular displacement sensor controls the movement of the part to be measured. The use of the phase-sensitive sorting module in the entire circuit improves the circuit's anti-interference ability, effectively avoids signal loss during transmission, and greatly improves the detection accuracy of angular displacement.
[0032] 2. The temperature compensation module of the present application is provided with an inductor L5. Since the inductor L5 has a certain inductive reactance, when the voltage signal is output after being compensated by the temperature compensation module, the voltage signal output by the temperature compensation module is relatively unstable. By providing the inductor L5, the voltage signal of the temperature compensation module can be output stably. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a signal transmission schematic diagram of the angular displacement sensor circuit of the present application;
[0034] Figure 2 is an overall schematic diagram of the angular displacement sensor circuit of an embodiment of the present application;
[0035] Figure 3 is a schematic diagram of a phase-sensitive rectifier module according to an embodiment of the present application;
[0036] Figure 4 is a schematic diagram of a temperature compensation module according to an embodiment of the present application;
[0037] Figure 5 is a schematic diagram of an amplification adjustment module in an embodiment of the present application;
[0038] Explanation of the accompanying drawings: 1. Angular displacement sensor; 2. Phase-sensitive rectifier module; 3. Temperature compensation module; 4. Signal processing module; 5. Amplification and adjustment module; 6. Phase-sensitive rectifier chip. DETAILED DESCRIPTION
[0039] The following is combined with Figure 1-Figure 5 This application is described in further detail.
[0040] Embodiment 1 of the present application provides an angular displacement sensor 1 circuit.
[0041] refer to Figure 1 and Figure 2The angular displacement sensor 1 circuit includes: an angular displacement sensor 1, a phase-sensitive rectifier module 2, a temperature compensation module 3, a signal processing module 4 and an amplification and adjustment module 5; the output end of the angular displacement sensor 1 is coupled to the input end of the phase-sensitive rectifier module 2, and the input end of the angular displacement sensor 1 is coupled to the output end of the amplification and adjustment module 5; the phase-sensitive rectifier module 2 includes a first output end and a second output end, the first output end of the phase-sensitive rectifier module 2 is coupled to the input end of the signal processing module 4, the second output end of the phase-sensitive rectifier module 2 is coupled to the temperature compensation module 3, and the output end of the signal processing module 4 is coupled to the input end of the amplification and adjustment module 5. Among them, the angular displacement sensor 1 is used to detect the angular displacement of the part to be measured, generate a corresponding electrical signal, and output the electrical signal to the phase-sensitive rectifier module 2; the phase-sensitive rectifier module 2 is used to convert and phase-sensitively rectify the received electrical signal to obtain a voltage signal, and transmit the voltage signal to the signal processing module 4 and the temperature compensation module 3 respectively; the signal processing module 4 is used to calculate and logically arrange the electrical signal, and then output it to the amplification and adjustment module 5; the amplification and adjustment module 5 is used to control the angular displacement of the part to be measured; the temperature compensation module 3 is used to output the received voltage signal after temperature compensation.
[0042] Reference Figure 3 The angular displacement sensor 1 includes a ring coil L1 and a rotor coil L2 rotatably disposed in the ring coil L1. The rotor coil L2 is used to couple with the part to be measured. Both ends of the ring coil L1 are coupled to the phase-sensitive rectifier module 2, and both ends of the rotor coil L2 are also coupled to the phase-sensitive rectifier module 2.
[0043] During detection, the rotor coil L2 is coupled to the part to be tested. After the rotor coil L2 is deflected with the rotation of the part to be tested, it sends an electrical signal to the phase-sensitive rectifier module 2. The phase-sensitive rectifier module 2 integrates the electrical signal and outputs a corresponding voltage signal and adjusts the deviation of the voltage signal; at the same time, the phase-sensitive rectifier module 2 transmits the adjusted voltage signal to the signal processing module 4, and the signal processing module 4 transmits the voltage signal to the amplification and adjustment module 5. The amplification and adjustment module 5 receives the voltage signal and amplifies it, then outputs a control signal, which is transmitted to the angular displacement sensor 1, so that the angular displacement sensor 1 controls the movement of the part to be tested. The phase-sensitive sorting module is used in the entire circuit. The phase-sensitive rectifier module 2 converts the received electrical signal into a high-precision voltage signal, which is then output after temperature compensation by the temperature compensation module 3, thereby improving the detection accuracy of the angular displacement.
[0044] Reference Figure 3The phase-sensitive rectifier module 2 includes a phase-sensitive rectifier chip 6, a resistor R1, a resistor R2, a resistor R3, a potentiometer R01, a transformer, a diode D11 and a diode D10. The phase-sensitive rectifier chip 6 includes a power pin P1, a first sampling pin P3, a second sampling pin P5, an output pin P2, a reference voltage pin P13, a first ground pin P12, a second ground pin P7 and a third ground pin P14. The transformer includes a primary coil L3 and a secondary coil L4; a first end of the rotor coil L2 is grounded, a second end of the rotor coil L2 is coupled to a first end of the resistor R1, and a second end of the resistor R1 is coupled to a first end of the resistor R1. The two ends are coupled to the reference voltage pin P13; the first end of the ring coil L1 is coupled to the first sampling pin P3, and the second end of the ring coil L1 is coupled to the second sampling pin P2; the first end of the resistor R2 is coupled to the output pin P2, the second end of the resistor R2 is coupled to the first end of the resistor R3, and the second end of the resistor R3 is coupled to the first end of the potentiometer; the cathode of the diode D11 is coupled to the first ground pin P12, the anode of the diode D11 is coupled to the anode of the external power supply, the anode of the diode D10 is coupled to the power pin P1, and the cathode of the diode D10 is coupled to the cathode of the external power supply.
[0045] Reference Figure 3 The phase-sensitive rectifier module 2 further includes a capacitor C3, the positive electrode of the capacitor C3 is coupled between the first end of the resistor R2 and the output pin P2, and the negative electrode of the capacitor C3 is grounded. Since the voltage signal outputted from the output 2 pin P2 is filtered by the capacitor C3, the anti-interference effect is achieved, so that the voltage signal outputted from the output pin P2 of the phase-sensitive rectifier chip 6 can be outputted stably.
[0046] Reference Figure 4 The temperature compensation module 3 includes a potentiometer R02, a potentiometer R03, a thermistor R4, a thermistor R5, an inductor L5, a capacitor C2 and a capacitor C3; a first end of the thermistor R4 is coupled to a second end of the potentiometer R01, a second end of the thermistor R4 is coupled to a second end of the potentiometer R02, and a first end of the potentiometer R02 is coupled to a first end of the thermistor R4; a first end of the thermistor R5 is coupled to a second end of the potentiometer R03, a second end of the thermistor R5 is coupled to a first end of the inductor L5, and a first end of the potentiometer R03 is coupled to a second end of the thermistor R5; a positive electrode of the capacitor C2 is coupled to a second end of the inductor L5, a negative electrode of the capacitor C2 is coupled to a negative electrode of the capacitor C3, and a positive electrode of the capacitor C3 is coupled to a first end of the primary coil L3.
[0047] Since the inductor L5 has a certain inductive reactance, when the voltage signal is output after being compensated by the temperature compensation module 3, the voltage signal output by the temperature compensation module 3 is relatively unstable. By setting the inductor L5, the voltage signal of the temperature compensation module 3 can be output stably.
[0048] Reference Figure 5The amplification adjustment module 5 includes a transistor V3, a transistor V6, a transistor V7, a transistor V9, a diode D3, a diode D4, a diode D5, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26 and a resistor R27; the anode of the diode D4 is coupled to the output end of the signal processing module 4, the anode of the diode D5 and the base of the transistor V7 are coupled to the cathode of the diode D4. The cathode of the diode D3 is coupled to the anode of the diode D4, the first end of the resistor R22 and the base of the transistor V6 are coupled to the anode of the diode D3, and the cathode of the diode D5 is coupled to the base of the transistor V6. The second end of the resistor R22 is coupled to the first end of the resistor R24, the collector of the transistor V6 and the collector of the transistor V3 are both coupled to the second end of the resistor R24, the emitter of the transistor V6 is coupled to the base of the transistor V3, the emitter of the transistor V3 is coupled to the first end of the resistor R25, and the second end of the resistor R25 is coupled to the first end of the resistor R26. The emitter of the transistor V7 and the collector of the transistor V9 are both coupled to the second end of the resistor R26, the collector of the transistor V7 is coupled to the base of the transistor V9, the emitter of the transistor V9 is coupled to the first end of the resistor R27, the second end of the resistor R27 is coupled to the first end of the resistor R23, and the second end of the resistor R23 is coupled to the base of the transistor V7. Among them, the transistors V3, V6 and V9 are specifically configured as NPN transistors, and the transistor V7 is specifically configured as a PNP transistor. A first end of the resistor R23 is coupled to the power pin P1 of the phase-sensitive rectifier chip 6 , and a second end of the resistor R25 is coupled to the second end of the primary coil L3 .
[0049] When the collector of transistor V6 receives a high-level signal, transistor V6 and transistor V3 are in a conducting state, transistor V7 and transistor V9 are in a non-conducting state, and the signal processing module 4 transmits the voltage signal to the primary coil through transistor V6 and transistor V3. After the signal is coupled by the transformer, the action of the part to be tested is controlled; when the collector of transistor V6 receives a low-level signal, transistor V7 and transistor V9 are in a conducting state, transistor V3 and transistor V6 are in a non-conducting state, and the signal processing module 4 transmits the voltage signal to the phase-sensitive rectifier chip 6 through transistor V7 and transistor V9 to control the action of the part to be tested; wherein resistors R22, R23, R24, R25, R26 and R27 are used for voltage division and current limiting to ensure the normal operation of transistors V3, V6, V7 and V9 in the module.
[0050] The input end of the signal processing module 4 is coupled to the cathode of the diode D11, the first end of the resistor R3, the first end of the potentiometer R03 and the third ground pin P14 of the phase-sensitive rectifier chip 6, and the output end of the signal processing module 4 is coupled to the anode of the diode D4.
[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. An angular displacement sensor circuit, characterized in that: include: An angular displacement sensor (1), a phase-sensitive rectification module (2), a temperature compensation module (3), a signal processing module (4) and an amplification adjustment module (5); the output end of the angular displacement sensor (1) is coupled to the input end of the phase-sensitive rectification module (2), and the input end of the angular displacement sensor (1) is coupled to the output end of the amplification adjustment module (5); the phase-sensitive rectification module (2) comprises a first output end and a second output end, the first output end of the phase-sensitive rectification module (2) is coupled to the input end of the signal processing module (4), the second output end of the phase-sensitive rectification module (2) is coupled to the temperature compensation module (3), and the output end of the signal processing module (4) is coupled to the input end of the amplification adjustment module (5); The angular displacement sensor (1) is used to generate a corresponding electrical signal based on the angular displacement of the part to be measured, and output the electrical signal to the phase-sensitive rectification module (2); The phase-sensitive rectification module (2) is used to convert the received electrical signal into a voltage signal, and transmit the voltage signal to the signal processing module (4) and the temperature compensation module (3) respectively; The signal processing module (4) is used to perform operations and logical arrangements on the voltage signal to obtain a control signal, so as to control the angular displacement of the part to be measured.
2. The angular displacement sensor circuit according to claim 1, characterized in that: The angular displacement sensor (1) comprises a ring coil L1 and a rotor coil L2 rotatably disposed in the ring coil L1, the rotor coil L2 being used to couple with a part to be measured, the two ends of the ring coil L1 being coupled to the phase-sensitive rectifier module (2), and the two ends of the rotor coil L2 being also coupled to the phase-sensitive rectifier module (2).
3. The angular displacement sensor circuit according to claim 2, characterized in that: The phase-sensitive rectifier module (2) comprises a phase-sensitive rectifier chip (6), a resistor R1, a resistor R2, a resistor R3, a potentiometer R01, a transformer, a diode D11, an external power supply of a diode D10, the phase-sensitive rectifier chip (6) comprises a power pin P1, a first sampling pin P3, a second sampling pin P5, an output pin P2, a reference voltage pin P13 and a first ground pin P12, and the transformer comprises a primary coil L3 and a secondary coil L4; The first end of the rotor coil L2 is grounded, the second end of the rotor coil L2 is coupled to the first end of the resistor R1, and the second end of the resistor R1 is coupled to the reference voltage pin P13; A first end of the loop coil L1 is coupled to the first sampling pin P3, and a second end of the loop coil L1 is coupled to the second sampling pin P2; The first end of the resistor R2 is coupled to the output pin P2, the second end of the resistor R2 is coupled to the first end of the resistor R3, and the second end of the resistor R3 is coupled to the first end of the potentiometer; The cathode of the diode D11 is coupled to the first ground pin P12, the anode of the diode D11 is coupled to the anode of the external power supply, the anode of the diode D10 is coupled to the power pin P1, and the cathode of the diode D10 is coupled to the cathode of the external power supply.
4. The angular displacement sensor circuit according to claim 3, characterized in that: The temperature compensation module (3) comprises a potentiometer R02, a potentiometer R03, a thermistor R4, a thermistor R5, an inductor L5, a capacitor C2 and a capacitor C3; The first end of the thermistor R4 is coupled to the second end of the potentiometer R01, the second end of the thermistor R4 is coupled to the second end of the potentiometer R02, and the first end of the potentiometer R02 is coupled to the first end of the thermistor R4; The first end of the thermistor R5 is coupled to the second end of the potentiometer R03, the second end of the thermistor R5 is coupled to the first end of the inductor L5, and the first end of the potentiometer R03 is coupled to the second end of the thermistor R5; The positive electrode of the capacitor C2 is coupled to the second end of the inductor L5 , the negative electrode of the capacitor C2 is coupled to the negative electrode of the capacitor C3 , and the positive electrode of the capacitor C3 is coupled to the first end of the primary coil L3 .
5. The angular displacement sensor circuit according to claim 4, characterized in that: The amplification adjustment module (5) comprises a transistor V3, a transistor V6, a transistor V7, a transistor V9, a diode D3, a diode D4, a diode D5, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26 and a resistor R27; The anode of the diode D4 is coupled to the output end of the signal processing module (4), and the anode of the diode D5 and the base of the transistor V7 are both coupled to the cathode of the diode D4; The cathode of the diode D3 is coupled to the anode of the diode D4, the first end of the resistor R22 and the base of the transistor V6 are both coupled to the anode of the diode D3, and the cathode of the diode D5 is coupled to the base of the transistor V6; The second end of the resistor R22 is coupled to the first end of the resistor R24, the collector of the transistor V6 and the collector of the transistor V3 are both coupled to the second end of the resistor R24, the emitter of the transistor V6 is coupled to the base of the transistor V3, the emitter of the transistor V3 is coupled to the first end of the resistor R25, and the second end of the resistor R25 is coupled to the first end of the resistor R26; The emitter of the transistor V7 and the collector of the transistor V9 are both coupled to the second end of the resistor R26, the collector of the transistor V7 is coupled to the base of the transistor V9, the emitter of the transistor V9 is coupled to the first end of the resistor R27, the second end of the resistor R27 is coupled to the first end of the resistor R23, and the second end of the resistor R23 is coupled to the base of the transistor V7.
6. The angular displacement sensor circuit according to claim 3, characterized in that: The phase-sensitive rectification module (2) further comprises a capacitor C3, wherein a positive electrode of the capacitor C3 is coupled between the first end of the resistor R2 and the output pin P2, and a negative electrode of the capacitor C3 is grounded.