Hall non-contact angle sensor circuit

Abstract

The utility model discloses a Hall non-contact angle sensor circuit. The Hall non-contact angle sensor circuit comprises a power supply interface module, a Hall chip module, a single-chip microcomputer module and a CAN communication module which are sequentially connected according to a signal transmission direction. The power supply interface module is used for providing a power supply for the whole circuit, the TVS tube T1 arranged at the power supply module is used for preventing the circuit from being damaged by various surge pulses, the circuit is safer, and the Hall chip module is used for sensing the magnetic field change of a magnet in the sensor and generating a signal; the single chip microcomputer module is used for receiving the signal transmitted by the Hall chip module and converting the signal into a digital signal; the CAN communication module is used for transmitting the digital signals output by the single-chip microcomputer module, the CAN communication module comprises a low-pass filter used for reducing communication interference, the low-pass filter is used for effectively reducing the problem of interference in communication, and the signals can be transmitted more stably.

Description

Technical Field

[0001] The utility model relates to the field of angle sensors, in particular to a Hall non-contact angle sensor circuit. Background Art

[0002] Non-contact sensors do not require any physical contact with the object or medium being detected. They can detect changes in electromagnetic fields or displacements within a specific range. Non-contact angle sensors have a wide range of applications due to the increasing use of process control and sensor elements in different fields such as industrial manufacturing, consumer electronics, automotive electronics, and aerospace.

[0003] Non-contact angle sensors are easily affected by the external environment, temperature and humidity, which causes interference to the signal during transmission, and ultimately leads to unstable or even no output of the sensor in the application device. Therefore, a solution is needed urgently. Summary of the invention

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a Hall non-contact angle sensor circuit. The utility model improves the anti-interference ability and stability of signal transmission through a Hall non-contact angle sensor circuit.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A Hall non-contact angle sensor circuit, the Hall non-contact angle sensor circuit comprises: a power interface module, a Hall chip module, a single chip microcomputer module and a CAN communication module which are sequentially connected according to the signal transmission direction;

[0007] The power interface module is used to provide power to the entire circuit.

[0008] The Hall chip module is used to sense the magnetic field changes of the magnet in the sensor and generate signals;

[0009] The single chip microcomputer module is used to receive the signal transmitted by the Hall chip module and convert it into a digital signal;

[0010] The CAN communication module is used to transmit the digital signal output by the single-chip microcomputer module. The CAN communication module includes a low-pass filter for reducing communication interference.

[0011] As a further solution of the utility model: the low-pass filter includes a resistor R13, a resistor R14 and a capacitor C19, one end of the resistor R13 is connected to the CAN high data line for receiving the CAN1 P signal, and the other end is connected to the resistor R14, and the other end of the resistor R14 is connected to the CAN low data line for receiving the CAN1 N signal; one end of the capacitor C19 is connected between the resistor R13 and the resistor R14, and the other end is connected to the ground terminal DGND.

[0012] As a further solution of the utility model: the CAN communication module also includes a CAN chip U5 of model TJA1051T / 3 and a common-mode inductor L5, the two input ends of the common-mode inductor L5 are respectively connected to one end of the resistor R13 and the resistor R14, and the two output ends of the common-mode inductor L5 are respectively connected to the CH pin and CL pin of the CAN chip.

[0013] As a further solution of the utility model: the CAN communication module also includes TVS tubes T2, TVS tubes T4 and TVS tubes T5 for surge protection, and the TVS tube T2 is connected to the CAN high-order data line and is located between the single-chip module and the resistor R13;

[0014] TVS tube T4 is connected to the CAN low-order data line and is located between the microcontroller module and resistor R14;

[0015] The TVS tube T5 is connected to the 5V pin of the CAN chip U5 and is located between the CAN chip U5 and the power supply.

[0016] As a further solution of the utility model: the power module comprises a power interface unit and a power voltage stabilizing unit which are connected in sequence according to the signal transmission direction;

[0017] The power interface unit is used to supply power to the entire circuit. The power interface unit includes an interface P1. Pin 1 of the interface P1 is connected to the CAN high-order data line to generate a CAN1 P signal, and pin 2 is connected to the CAN low-order data line to generate a CAN1 N signal.

[0018] The power supply voltage stabilization unit is used to stabilize the output voltage of the power supply module. The power supply voltage unit includes a linear voltage stabilization chip U1 with a model number of ISL_80410IBEZ-T and a linear voltage stabilization chip U2 with a model number of TLV1117-33IDCYR.

[0019] As a further solution of the utility model: the Hall non-contact angle sensor circuit also includes a CAN shield floating processing module, which is used to isolate the shielding layer from the shell to resist external interference on the signal.

[0020] As a further solution of the utility model: the Hall chip module includes a Hall chip U3 with model number HAL3900DJ-A.

[0021] As a further solution of the utility model: the single-chip microcomputer module includes a single-chip microcomputer U4 of model STM32G0B1CET6N, and the single-chip microcomputer U4 is connected to a program burning pin circuit, a crystal oscillator circuit, a reset circuit and a filter circuit.

[0022] As a further solution of the utility model: the PF0-0SC_IN pin of the single-chip microcomputer U4 is used to output the OSC IN signal, and the PF1-0SC_OUT pin is used to output the OSC OUT signal. The OSC IN signal and the OSC OUT signal are respectively transmitted to both ends of the crystal oscillator CRY1 in the crystal oscillator circuit.

[0023] As a further solution of the utility model: the Hall non-contact angle sensor circuit also includes a power monitoring module, and the power monitoring module is used to monitor the power module in real time.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] 1. The utility model uses a Hall non-contact angle sensor circuit to improve the anti-interference ability and stability of signal transmission.

[0026] 2. The low-pass filter in the CAN communication module of the utility model can effectively reduce interference problems in communication and improve the stability of the circuit.

[0027] 3. The utility model adopts multiple TVS tubes to perform surge protection on the circuit, preventing the circuit from being damaged by various surge pulses and interference from other signals to the circuit, ensuring that the signal can be transmitted stably.

[0028] 4. The CAN communication module of the utility model includes an air discharge tube T3, which is used to limit the magnitude of the inter-electrode voltage so that the circuit connected to the air discharge tube T3 is protected.

[0029] 5. The utility model improves the anti-interference ability of the circuit and prevents the influence of the outside world on the CAN signal through the combined effect of anti-surge, anti-static, anti-interference and common mode suppression design. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a block diagram of the overall circuit principle of the Hall non-contact angle sensor in the utility model.

[0031] Figure 2 The schematic diagram is a circuit diagram of a power interface module of the Hall non-contact angle sensor in the present utility model.

[0032] Figure 3 The utility model is a circuit diagram of the power supply voltage stabilization module of the Hall non-contact angle sensor.

[0033] Figure 4 The schematic diagram is a circuit diagram of a Hall chip module of the Hall non-contact angle sensor in the present utility model.

[0034] Figure 5 The utility model is a partial circuit schematic diagram of the single chip microcomputer module of the Hall non-contact angle sensor.

[0035] Figure 6 The utility model is a schematic diagram of a crystal oscillator circuit in a single-chip microcomputer module of a Hall non-contact angle sensor.

[0036] Figure 7 The present invention is a schematic diagram of a reset circuit in a single-chip microcomputer module of a Hall non-contact angle sensor.

[0037] Figure 8 The utility model is a schematic diagram of the program burning pin circuit in the single-chip microcomputer module of the Hall non-contact angle sensor.

[0038] Fig. 9 The utility model is a schematic diagram of the filter circuit in the single-chip microcomputer module of the Hall non-contact angle sensor.

[0039] Fig.10 The utility model is a circuit diagram of the CAN communication module of the Hall non-contact angle sensor.

[0040] Fig.11 The circuit schematic diagram of the power supply monitoring circuit of the Hall non-contact angle sensor in the utility model.

[0041] Fig.12 The utility model discloses a circuit schematic diagram of a CAN shielded floating ground processing circuit of a Hall non-contact angle sensor. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] See also Figure 1-Figure 12In an embodiment of the utility model, a Hall non-contact angle sensor circuit is provided, and the Hall non-contact angle sensor circuit comprises: a power interface module, a Hall chip module, a single-chip microcomputer module and a CAN communication module which are sequentially connected according to the signal transmission direction;

[0044] The power interface module is used to provide power to the entire circuit. The TVS tube T1 set at the power module is used to prevent the circuit from being damaged by various surge pulses, which is safer.

[0045] The Hall chip module is used to sense the magnetic field changes of the magnet in the sensor and generate signals. When the sensor rotates, the Hall chip U3 senses the magnetic field changes of the magnet in the sensor and transmits the sensed data to the microcontroller U4.

[0046] The single-chip microcomputer module is used to receive the signal transmitted by the Hall chip module and convert it into a digital signal. The single-chip microcomputer U4 receives and converts it into a digital signal, and controls the circuit according to the received signal;

[0047] The CAN communication module is used to transmit the digital signal output by the single-chip microcomputer module. The CAN communication module includes a low-pass filter for reducing communication interference, so that low-frequency signals can pass normally, while high-frequency signals exceeding the set critical value are blocked and weakened, thereby achieving the effect of reducing communication interference and making signal transmission more stable.

[0048] Reference Figure 2 :

[0049] The power module includes a power interface unit and a power voltage stabilizing unit in sequence according to the signal transmission direction;

[0050] The power interface unit is used to supply power to the entire circuit. The power interface unit includes an interface P1. Pin 1 of the interface P1 is connected to the CAN high-order data line to generate a CAN1 P signal, and pin 2 is connected to the CAN low-order data line to generate a CAN1 N signal.

[0051] Pin 3 of interface P1 is connected to VDD, and pin 4 is connected to ground GND0;

[0052] TVS tube T1, capacitor C1, capacitor C2 and capacitor C3 are connected in parallel between pin 3 and pin 4 in the direction of signal transmission;

[0053] Among them, one end of the TVS tube T1 connected to the 3-pin is also connected to the VDD end. The VDD end inputs a voltage of 8-36V to the entire circuit. The TVS tube T1 is used to prevent the circuit at the power interface unit from having an abnormal overvoltage and reaching the TVS breakdown voltage. The TVS is in a high-impedance state, discharging the instantaneous overcurrent caused by the abnormal overvoltage to the ground terminal GND0, and at the same time clamping the abnormal overvoltage at a lower level, thereby protecting the subsequent circuit from damage by the abnormal overvoltage; when the abnormal overvoltage disappears, the resistance of the TVS tube T1 returns to a high-impedance state to cope with the subsequent abnormal overvoltage in the circuit, so as to achieve surge protection for the current, prevent the circuit from being interfered by other signals, and ensure that the signal can be transmitted stably.

[0054] C1 is a filter capacitor. A diode D1 and a filter inductor L1 are connected in series between the ends of capacitors C1 and C2 connected to pin 3 according to the signal transmission direction. A filter inductor L2 is connected between the ends of capacitors C1 and C2 connected to pin 4. The anti-reverse diode D1 is used to ensure the signal transmission direction to protect the circuit from breakdown. The filter inductors L1 and L2 are mainly used to remove clutter signals in the circuit, and the impedance characteristics of the inductor element to the current are used to achieve the filtering purpose, so that the output signal in the circuit is more stable.

[0055] One end of the capacitor C2 connected to the 3 pin outputs a PWR IN signal, and one end of the capacitor C2 connected to the 4 pin is connected to the ground terminal DGND.

[0056] Reference Figure 3 :

[0057] The power supply voltage regulator unit is used to stabilize the output voltage of the power supply module. The power supply voltage unit includes a linear voltage regulator chip U1 with a model number of ISL_80410IBEZ-T and a linear voltage regulator chip U2 with a model number of TLV1117-33IDCYR;

[0058] The IN pin of the linear voltage regulator chip U1 is used to receive the PWR IN signal of the power interface unit, and after receiving the PWR IN signal, a capacitor C4 and a resistor R1 are sequentially connected in parallel according to the transmission direction of the signal, the capacitor C4 is connected to the ground terminal DGND, and the resistor R1 is connected in series with the resistor R2 and then connected to the ground terminal DGND;

[0059] The NC pin is left floating;

[0060] The EN pin is connected between resistors R1 and R2;

[0061] The PAD_GND pin and the GND pin are connected to the ground terminal DGND;

[0062] The OUT pin is connected in parallel with a resistor R3 and a capacitor C5 in the direction of signal transmission, and finally outputs a 5V voltage to the Vin pin of the linear voltage regulator chip U2; the resistor R3 is connected in series with the resistor R4 and then connected to the ground terminal DGND, and the other end of the capacitor C5 is connected to the ground terminal DGND.

[0063] After the Vin pin of the linear voltage regulator chip U2 receives a 5V voltage, a capacitor C6 and a resistor R5 are connected in parallel in the direction of signal transmission. The other end of the resistor R5 is connected to the Vout pin and finally to the power supply terminal VCC. The power supply terminal VCC outputs a 3.3V voltage. The Vout pin is also connected to the positive terminal of the capacitor C7. The other end of the capacitor C7, the other end of the resistor C6 and the GND pin are also connected to the ground terminal DGND.

[0064] Reference Figure 4 :

[0065] The Hall chip module includes a Hall chip U3 of model HAL3900DJ-A; the CSN pin of the Hall chip U3 outputs a CSN signal and is connected to the VCC terminal through a resistor R6 to receive a 3.3V voltage;

[0066] The VSUP pin is connected to the VCC terminal, capacitor C8 and ground terminal DGND in sequence along the signal transmission direction. Capacitor C8 is a filter capacitor that provides a stable voltage for the Hall chip U3.

[0067] The GND pin and the TEST pin are connected in parallel to the ground terminal DGND;

[0068] The MISO pin is used to output the MISO signal;

[0069] The WAKI / O pin is connected to the ground terminal DGND;

[0070] The MOSI pin is used to output the MOSI signal;

[0071] The SCK pin is used to output the SCK signal.

[0072] Reference Figure 5-Figure 9 :

[0073] The single-chip microcomputer module includes a single-chip microcomputer U4 of model STM32G0B1CET6N, and the single-chip microcomputer U4 is connected with a program burning pin circuit, a crystal oscillator circuit, a reset circuit and a filter circuit;

[0074] in,

[0075] The PC14-0SC32_IN pin is connected to the resistor R7 and then to the ground terminal DGND;

[0076] The PC15-0SC32_OUT pin is connected to the resistor R8 and then to the ground terminal DGND;

[0077] The VREF+ pin is used to output the VREF+ signal;

[0078] The VDD / VDDA pin is used to output the VDDA signal;

[0079] The VSS / VSSA pin is used to output the DGND signal;

[0080] The PF0-0SC_IN pin of the single-chip microcomputer U4 is used to output the OSC IN signal, and the PF1-0SC_OUT pin is used to output the OSC OUT signal. The OSC IN signal and the OSC OUT signal are respectively transmitted to the two ends of the crystal oscillator CRY1 in the crystal oscillator circuit to generate the clock frequency required by the single-chip microcomputer U4. The higher the clock frequency provided by the crystal oscillator CRY1, the faster the running speed of the single-chip microcomputer U4.

[0081] PF2-NRST pin is used to output nRST signal;

[0082] The PA1 pin is used to output the PWR AD signal;

[0083] The PA2 pin is used to output the TX signal and connect the test point TX;

[0084] The PA3 pin is used to output the RX signal and connect the test point RX;

[0085] The PA5 pin is used to receive the SCK signal output by the Hall chip U3;

[0086] The PA6 pin is used to receive the MISO signal output by the Hall chip U3;

[0087] The PA7 pin is used to receive the MOSI signal output by the Hall chip U3;

[0088] The PB1 pin is used to receive the CSN signal output by the Hall chip U3;

[0089] The PA14-BOOTO pin is used to output the SWCLK signal;

[0090] The PA13 pin is used to output the SWDIO signal;

[0091] PA12[PA10] pin is used to receive CAN1 TX signal;

[0092] PA11[PA9] pin is used to receive CAN1 RX signal;

[0093] The rest of the pins are left floating.

[0094] The crystal oscillator circuit includes a crystal oscillator CRY1, and both ends of the crystal oscillator CRY1 receive the OSC IN signal and the OSC OUT signal respectively. At the same time, the end of the crystal oscillator CRY1 receiving the OSC IN signal is connected to the capacitor C9 and then connected to the ground terminal DGND, and the end of the crystal oscillator CRY1 receiving the OSCOUT signal is connected to the capacitor C10 and then connected to the ground terminal DGND; the function of the crystal oscillator CRY1 is to generate the clock frequency required by the microcontroller U4, and the execution of all instructions of the microcontroller U4 is based on the clock frequency.

[0095] The power supply terminal VCC of the reset circuit is connected to the ground terminal DGND after passing through the resistor R9 and the capacitor C11 in sequence according to the signal transmission direction, and the nRST signal is transmitted between the resistor R9 and the capacitor C11.

[0096] The program burning pin circuit includes a connector J1, wherein pin 1 of the connector J1 is connected to the power supply terminal VCC, pin 2 is connected to the power supply terminal VCC through a resistor R10 after receiving a SWDIO signal, pin 3 is connected to the power supply terminal VCC through a resistor R11 after receiving a SWCLK signal, a resistor R12 is also connected to the connection between pin 3 and resistor R11, the other end of the resistor R12 is connected to the ground terminal DGND, and pin 4 is connected to the ground terminal DGND.

[0097] After the power supply terminal VCC of the filter circuit is connected in series with the magnetic bead L3, filter capacitor C12, filter capacitor C13, filter capacitor C14, filter capacitor C15 and filter capacitor C16 are connected in parallel between the magnetic bead L3 and the ground terminal DGND in sequence according to the signal transmission direction, filter capacitor C14 and filter capacitor C15 are connected to one end of the power supply terminal VCC and are connected to the VDDA signal and inductor L4 in sequence in the signal transmission direction, and filter capacitor C15 and filter capacitor C16 are connected to one end of the power supply terminal VCC and are connected to the VREF+ signal.

[0098] Reference Fig.10 :

[0099] The low-pass filter in the CAN communication module includes a resistor R13, a resistor R14 and a capacitor C19. One end of the resistor R13 is connected to the CAN high-order data line for receiving the CAN1 P signal, and the other end is connected to the resistor R14. The other end of the resistor R14 is connected to the CAN low-order data line for receiving the CAN1 N signal; one end of the capacitor C19 is connected between the resistor R13 and the resistor R14, and the other end is connected to the ground terminal DGND to simultaneously input the high-order signal and the low-order signal to the CAN chip U5;

[0100] An air discharge tube T3, a low-pass filter, a common-mode inductor L5 and a CAN chip U5 are sequentially connected between the CAN high-order data line and the CAN low-order data line according to the signal transmission direction. The application principle of the air discharge tube T3 is gas discharge. When not in action, the air discharge tube T3 is in a high insulation state and is non-conductive. When the inter-stage voltage intensity exceeds the gas breakdown voltage, gap discharge is caused to limit the inter-stage voltage, so that the circuit connected to the air discharge tube T3 is protected;

[0101] The common-mode inductor L5 is used to implement the common-mode suppression design of the circuit. The principle of common-mode suppression is that when the common-mode current flows, the magnetic fluxes in the magnetic rings are superimposed on each other, thereby having a considerable inductance, which suppresses the common-mode current. Therefore, the common-mode inductor L5 can effectively suppress the common-mode interference signal in the balanced line without affecting the differential-mode signal normally transmitted by the line.

[0102] The common-mode inductor L5 has high magnetic permeability, high saturation magnetic induction intensity, high temperature stability and flexible frequency characteristics. It is essentially a two-way filter. On the one hand, it can filter out the common-mode signal interference on the signal line, and on the other hand, it can suppress the signal line itself from emitting electromagnetic interference to the outside.

[0103] The CAN high-order data line between the air discharge tube T3 and the low-pass filter is connected with the TVS tube T2 and the filter capacitor C17 in sequence according to the signal transmission direction, and the other ends of the TVS tube T2 and the filter capacitor C17 are connected to the ground terminal DGND; the CAN low-order data line between the air discharge tube T3 and the low-pass filter is connected with the TVS tube T3 and the filter capacitor C18 in sequence according to the signal transmission direction, and the other ends of the TVS tube T3 and the filter capacitor C18 are connected to the ground terminal DGND.

[0104] The CAN communication module uses a CAN chip U5 of model TJA1051T / 3. The two input ends of the common-mode inductor L5 are respectively connected to one end of the resistor R13 and the resistor R14. The two output ends of the common-mode inductor L5 are respectively connected to the CH pin and the CL pin of the CAN chip.

[0105] The S pin of the CAN chip U5 is connected to the ground terminal DGND through a pull-down resistor R5;

[0106] The Vio pin is connected to the VCC terminal through the pull-up resistor R16 and the filter capacitor C20, and the other end of the filter capacitor C20 is connected to the ground terminal DGND;

[0107] The RXD pin is used to output the CAN1 RX signal to the microcontroller;

[0108] The 5V pin is connected to the filter capacitor C21 to output a 5V voltage. At the same time, the 5V pin is also connected to a TVS tube T5 connected in parallel with the filter capacitor C21. TVS tubes T2, T4 and T5 are all used for surge protection of the circuit, making the circuit more stable.

[0109] The GND pin is connected to the ground terminal DGND;

[0110] The TXD pin is used to output the CAN1 TX signal to the microcontroller.

[0111] Reference Fig.11 :

[0112] The Hall contactless angle sensor circuit also includes a power monitoring module, which is used to monitor the power module in real time; after the PWR AD signal is input into the circuit of the power monitoring module, it passes through the filter capacitor C22 and the resistor R19 in sequence according to the signal transmission direction; the PWR IN signal passes through the resistor R20 in the signal transmission direction, and the other end of the resistor R19 is connected to the other end of the resistor R20 and then connected to the ground terminal DGND through the resistor R21.

[0113] Reference Fig.12 :

[0114] The Hall contactless angle sensor circuit also includes a CAN shield floating ground processing module, which is used to isolate the shielding layer from the shell to resist external interference with the signal; the CAN Sheild signal passes through a parallel resistor R22 and a capacitor C23, and the other ends of the resistor R22 and the capacitor C23 are connected to the ground terminal GND0.

[0115] Of course, it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0116] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0117] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A Hall contactless angle sensor circuit, characterized in that: The Hall non-contact angle sensor circuit includes: a power interface module, a Hall chip module, a single chip microcomputer module and a CAN communication module which are sequentially connected according to the signal transmission direction; The power interface module is used to provide power to the entire circuit. The Hall chip module is used to sense the magnetic field changes of the magnet in the sensor and generate signals; The single chip microcomputer module is used to receive the signal transmitted by the Hall chip module and convert it into a digital signal; The CAN communication module is used to transmit the digital signal output by the single-chip microcomputer module. The CAN communication module includes a low-pass filter for reducing communication interference.

2. A Hall contactless angle sensor circuit according to claim 1, characterized in that: The low-pass filter includes a resistor R13, a resistor R14 and a capacitor C19. One end of the resistor R13 is connected to the CAN high data line for receiving the CAN1 P signal, and the other end is connected to the resistor R14. The other end of the resistor R14 is connected to the CAN low data line for receiving the CAN1 N signal. One end of the capacitor C19 is connected between the resistor R13 and the resistor R14, and the other end is connected to the ground terminal DGND.

3. A Hall contactless angle sensor circuit according to claim 2, characterized in that: The CAN communication module also includes a CAN chip U5 of model TJA1051T / 3 and a common-mode inductor L5. The two input ends of the common-mode inductor L5 are respectively connected to one end of the resistor R13 and the resistor R14, and the two output ends of the common-mode inductor L5 are respectively connected to the CH pin and CL pin of the CAN chip.

4. A Hall contactless angle sensor circuit according to claim 3, characterized in that: The CAN communication module also includes TVS tubes T2, T4 and T5 for surge protection. TVS tube T2 is connected to the CAN high-order data line and is located between the single-chip module and the resistor R13. TVS tube T4 is connected to the CAN low-order data line and is located between the microcontroller module and resistor R14; The TVS tube T5 is connected to the 5V pin of the CAN chip U5 and is located between the CAN chip U5 and the power supply.

5. A Hall contactless angle sensor circuit according to claim 2, characterized in that: The power module includes a power interface unit and a power voltage stabilizing unit which are connected in sequence according to the signal transmission direction; The power interface unit is used to supply power to the entire circuit. The power interface unit includes an interface P1. Pin 1 of the interface P1 is connected to the CAN high-order data line to generate a CAN1 P signal, and pin 2 is connected to the CAN low-order data line to generate a CAN1 N signal. The power supply voltage stabilization unit is used to stabilize the output voltage of the power supply module. The power supply voltage unit includes a linear voltage stabilization chip U1 with a model number of ISL_80410IBEZ-T and a linear voltage stabilization chip U2 with a model number of TLV1117-33IDCYR.

6. A Hall contactless angle sensor circuit according to claim 1, characterized in that: The Hall non-contact angle sensor circuit also includes a CAN shield floating ground processing module, which is used to isolate the shielding layer from the shell to resist external interference on the signal.

7. A Hall contactless angle sensor circuit according to claim 1, characterized in that: The Hall chip module includes a Hall chip U3 whose model is HAL3900DJ-A.

8. A Hall contactless angle sensor circuit according to claim 1, characterized in that: The single-chip microcomputer module includes a single-chip microcomputer U4 of model STM32G0B1CET6N, and the single-chip microcomputer U4 is connected with a program burning pin circuit, a crystal oscillator circuit, a reset circuit and a filter circuit.

9. A Hall contactless angle sensor circuit according to claim 8, characterized in that: The PF0-0SC_IN pin of the microcontroller U4 is used to output the OSC IN signal, and the PF1-0SC_OUT pin is used to output the OSC OUT signal. The OSC IN signal and the OSC OUT signal are respectively transmitted to both ends of the crystal oscillator CRY1 in the crystal oscillator circuit.

10. The Hall contactless angle sensor circuit according to claim 1, characterized in that: The Hall non-contact angle sensor circuit also includes a power supply monitoring module, which is used to perform real-time monitoring on the power supply module.

Images