High-precision crystal gyroscope sensor circuit

Abstract

The utility model belongs to the technical field of gyroscope sensors, and particularly discloses a high-precision crystal gyroscope sensor circuit which comprises a single chip microcomputer circuit composed of a single chip microcomputer U5, a clock circuit and a standby power supply circuit, and the clock circuit and the standby power supply circuit are connected with the single chip microcomputer U5. According to the utility model, through cooperation of the single-chip microcomputer circuit, the angular velocity sensing circuit, the acceleration sensing circuit, the communication circuit and the power supply circuit, in the long-term use process of the gyroscope sensor circuit, output signals are high in stability and small in drift, and through cooperation of the high-precision crystal gyroscope angular velocity sensing chip and the filter capacitor, the precision of the gyroscope sensor circuit is improved. The high-frequency noise interference can be effectively reduced, the output signal can be smoothed, the resonant frequency of the oscillator can be suppressed, the high-frequency noise can be filtered through the cooperation of the acceleration sensing chip and the first filter circuit, the influence of resonance on the measurement result can be reduced, the output signal is smoother and more stable, and the measurement precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gyroscope sensors, in particular to a high-precision crystal gyroscope sensor circuit. Background Art

[0002] A gyroscope sensor is a device used to measure angular velocity (speed of rotation) that contains a vibrating structure, usually some kind of micromechanical system (MEMS). As the device rotates, the rotational action causes the structure to vibrate and deflect. This deflection can be detected by an inductor (such as a capacitive sensor or oscillator) and converted into a corresponding electrical signal. By measuring the frequency of the oscillations or the amplitude of the change, the angular velocity of the object can be inferred.

[0003] For example, the patent application number is 202111389396.X, which discloses a highly vibration-resistant fully symmetrical MEMS gyroscope sensor structure. The inner and outer frame mass bodies of the sensor structure are stably driven by the driving shaft electrodes, respectively, so that they are in differential high-frequency oscillation. When an angular velocity signal is input, the movement of the inner and outer frame mass bodies is stably detected by the sensitive shaft electrodes and closed-loop control is achieved using force feedback control signals. The inner and outer frame frequency adjustment electrodes and orthogonal compensation electrodes respectively eliminate the asymmetry of the mass bodies caused by factors such as processing errors, thereby improving the working efficiency of the sensor structure. Both the inner and outer frames have independent gyroscope effects and functions, and the output form of the synthetic differential is beneficial to improving the detection efficiency of the input signal.

[0004] However, during long-term use, the output signal of the gyroscope sensor will be disturbed by the external environment and fluctuate to a certain extent, causing the output signal to drift within a certain range, resulting in unstable output signal, thereby affecting the measurement accuracy of the gyroscope sensor. Therefore, we need to propose a high-precision crystal gyroscope sensor circuit to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a high-precision crystal gyroscope sensor circuit. Through the cooperation of a single-chip microcomputer circuit, an angular velocity sensor circuit, an acceleration sensor circuit, a communication circuit and a power supply circuit, the gyroscope sensor circuit can have a high output signal stability and a small drift during long-term use, so as to solve the problems raised in the background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a high-precision crystal gyroscope sensor circuit, comprising: a single-chip circuit, the single-chip circuit consisting of a single-chip microcomputer U5 and a clock circuit and a backup power supply circuit connected to the single-chip microcomputer U5;

[0007] An angular velocity sensing circuit connected to the single-chip computer U5, the angular velocity sensing circuit comprising a high-precision crystal gyroscope angular velocity sensing chip U4 and a filter capacitor connected to the high-precision crystal gyroscope angular velocity sensing chip U4, wherein pins 1 and 4 of the high-precision crystal gyroscope angular velocity sensing chip U4 are respectively connected to pins 16 and 18 of the single-chip computer U5;

[0008] An acceleration sensing circuit connected to the single-chip computer U5, the acceleration sensing circuit comprising an acceleration sensing chip U3, the acceleration sensing chip U3 being connected to a first filtering circuit, the pin 1 and pin 10 of the acceleration sensing chip U3 being respectively connected to the pin 14 and pin 13 of a high-precision crystal gyroscope angular velocity sensor chip U4;

[0009] A communication circuit connected to the single-chip microcomputer U5, wherein the communication circuit is connected to the single-chip microcomputer U5 via a connector P1, and the other end of the communication circuit is connected to an electrostatic protection circuit;

[0010] A power supply circuit is provided for supplying power to the single-chip microcomputer circuit, the angular velocity sensor circuit and the acceleration sensor circuit respectively, wherein the power supply circuit comprises a second filter circuit, one end of the second filter circuit is connected in parallel with a voltage conversion circuit and a voltage transmission circuit, the other end of the second filter circuit is connected with a linear low voltage dropout regulator U2, and one end of the linear low voltage dropout regulator U2 is connected with a decoupling capacitor.

[0011] Preferably, the clock circuit comprises a crystal oscillator Y1, two ends of which are respectively connected to pins 5 and 6 of the single-chip microcomputer U5, and the other end of which is grounded.

[0012] Preferably, the backup power supply circuit includes a battery BAT and a diode D25, one end of the diode D25 is connected to a resistor R3, one end of the resistor R3 is connected to pin 1 of the single-chip microcomputer U5, and one end of the battery BAT is connected to the connection end of the resistor R3 and the single-chip microcomputer U5, a capacitor C26 is connected between pins 1 and 44 of the single-chip microcomputer U5, and one end of the capacitor C26 away from the resistor R3 is grounded.

[0013] Preferably, the filter capacitor includes a ground capacitor C10 and a capacitor C11, the ground capacitor C10 is connected to pin 6 of the high-precision crystal gyroscope angular velocity sensor chip U4, the capacitor C11 is connected to pin 8 of the high-precision crystal gyroscope angular velocity sensor chip U4, and the ground end of the ground capacitor C10 is connected to one end of the capacitor C11.

[0014] Preferably, the first filtering circuit includes a ground capacitor C9 and a ground capacitor C12, the ground capacitor C9 is connected to pin 3 of the acceleration sensor chip U3, and the non-grounded end of the ground capacitor C12 is respectively connected to pins 8 and 6 of the acceleration sensor chip U3.

[0015] Preferably, the communication circuit includes a communication chip U1 supporting RS232 communication or RS485 communication, pin 2 of the communication chip U1 is connected to a resistor R2, pin 3 of the communication chip U1 is connected to a resistor R1, and one end of the resistor R1 and one end of the resistor R2 are respectively connected to pin 2 and pin 3 of the connector P1;

[0016] The electrostatic protection circuit includes an electrostatic diode D2, an electrostatic diode D3 and an electrostatic diode D4 which are arranged in parallel. One end of the electrostatic diode D2 is connected to pin 1 of the connector P1, one end of the electrostatic diode D3 is connected to pin 7 of the communication chip U1, and one end of the electrostatic diode D4 is connected to pin 6 of the communication chip U1.

[0017] Preferably, the voltage conversion circuit includes a DC-DC converter power1, pin 1 of the DC-DC converter power1 is connected to a resistor R4 connected to the connector P1, pin 2 of the DC-DC converter power1 is grounded, and pin 3 of the DC-DC converter power1 is connected to a second filtering circuit.

[0018] Preferably, the voltage transmission circuit includes a fuse F1 with a current limiting value of 500Ma and a Schottky diode D7, the fuse F1 and the Schottky diode D7 are connected in series, one end of the fuse F1 away from the Schottky diode D7 is connected to the connection end of the resistor R4 and the DC-DC converter power1, and one end of the Schottky diode D7 away from the fuse F1 is connected to the connection end of the second filter circuit and the DC-DC converter power1.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The utility model can make the output signal of the gyroscope sensor circuit highly stable and with small drift during long-term use through the cooperation of the single-chip microcomputer circuit, the angular velocity sensor circuit, the acceleration sensor circuit, the communication circuit and the power supply circuit, thereby improving the measurement accuracy of the gyroscope sensor to a certain extent.

[0021] 2. The utility model can effectively reduce high-frequency noise interference, smooth the output signal, and suppress the oscillator resonance frequency through the cooperation of the high-precision crystal gyroscope angular velocity sensor chip and the filter capacitor, thereby improving the stability, accuracy and reliability of the measurement. Through the cooperation of the acceleration sensor chip and the first filter circuit, high-frequency noise can be filtered out, the influence of resonance on the measurement result can be reduced, the output signal can be smoother and more stable, and the measurement accuracy can be improved.

[0022] 3. The utility model enables the power supply circuit to have two power supply modes through the cooperation of the voltage conversion circuit and the voltage transmission circuit with the second filtering circuit, the linear low voltage difference regulator U2 and the decoupling capacitor. One power supply mode is composed of the voltage conversion circuit, the second filtering circuit, the linear low voltage difference regulator U2 and the decoupling capacitor, which can convert the input DC voltage of 7-36V into 5V AC voltage to power the single-chip circuit, the angular velocity sensor circuit and the acceleration sensor circuit; the other power supply mode is composed of the voltage transmission circuit, the second filtering circuit, the linear low voltage difference regulator U2 and the decoupling capacitor, which can convert the input DC voltage of 5V into 5V AC voltage to power the single-chip circuit, the angular velocity sensor circuit and the acceleration sensor circuit, so that the gyroscope sensor circuit is suitable for a relatively wide voltage input range, thereby improving the versatility of the gyroscope sensor circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a circuit diagram of the single chip microcomputer circuit of the utility model;

[0024] Figure 2 The circuit diagram of the angular velocity sensor circuit of the utility model;

[0025] Figure 3 It is a circuit diagram of the acceleration sensor circuit of the utility model;

[0026] Figure 4 A circuit diagram of the communication circuit of the utility model;

[0027] Figure 5 The utility model is a circuit diagram of the power supply circuit. DETAILED DESCRIPTION

[0028] 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.

[0029] See also Figure 1-5 , the utility model provides a technical solution: a high-precision crystal gyroscope sensor circuit, including: a single-chip circuit, the single-chip circuit is composed of a single-chip U5 and a clock circuit and a backup power supply circuit connected to the single-chip U5;

[0030] The clock circuit includes a crystal oscillator Y1, two ends of which are connected to pins 5 and 6 of the single-chip microcomputer U5, respectively, and the other end of the crystal oscillator Y1 is grounded. The crystal oscillator Y1 generates a stable high-frequency clock signal through its internal oscillation circuit, and then inputs the clock signal to the clock input pin of the single-chip microcomputer U5. The single-chip microcomputer U5 controls its internal operating rhythm according to the frequency of the clock signal to ensure that each component operates in the correct timing, thereby achieving normal functions.

[0031] The backup power circuit includes a battery BAT and a diode D25, one end of the diode D25 is connected to a resistor R3, one end of the resistor R3 is connected to pin 1 of the single-chip microcomputer U5, and one end of the battery BAT is connected to the connection end of the resistor R3 and the single-chip microcomputer U5, a capacitor C26 is connected between pin 1 and pin 44 of the single-chip microcomputer U5, and one end of the capacitor C26 away from the resistor R3 is grounded. When the main power fails or the power is cut off, the battery BAT provides power to the single-chip microcomputer U5 to ensure the normal operation of the single-chip microcomputer U5. Through the design of the diode D25, the resistor R3 and the capacitor C26, the switching and stable output of the backup power supply can be realized, and the reliability and stability of the system can be improved.

[0032] An angular velocity sensing circuit connected to the single-chip computer U5, the angular velocity sensing circuit comprising a high-precision crystal gyroscope angular velocity sensing chip U4 and a filter capacitor connected to the high-precision crystal gyroscope angular velocity sensing chip U4, wherein pins 1 and 4 of the high-precision crystal gyroscope angular velocity sensing chip U4 are respectively connected to pins 16 and 18 of the single-chip computer U5;

[0033] The filter capacitor includes a ground capacitor C10 and a capacitor C11. The ground capacitor C10 is connected to pin 6 of the high-precision crystal gyroscope angular velocity sensor chip U4, and the capacitor C11 is connected to pin 8 of the high-precision crystal gyroscope angular velocity sensor chip U4. The ground end of the ground capacitor C10 is connected to one end of the capacitor C11. The ground capacitor C10 and the capacitor C11 can effectively reduce high-frequency noise interference, smooth the output signal, and suppress the oscillator resonance frequency, thereby improving the stability, accuracy and reliability of the measurement.

[0034] An acceleration sensing circuit connected to the single-chip computer U5, the acceleration sensing circuit comprising an acceleration sensing chip U3, the acceleration sensing chip U3 being connected to a first filtering circuit, the pin 1 and pin 10 of the acceleration sensing chip U3 being respectively connected to the pin 14 and pin 13 of a high-precision crystal gyroscope angular velocity sensor chip U4;

[0035] The first filtering circuit includes a ground capacitor C9 and a ground capacitor C12, wherein the ground capacitor C9 is connected to pin 3 of the acceleration sensor chip U3, and the non-grounded end of the ground capacitor C12 is respectively connected to pin 8 and pin 6 of the acceleration sensor chip U3. The ground capacitor C9 and the ground capacitor C12 can filter out high-frequency noise, reduce the influence of resonance on the measurement result, make the output signal smoother and more stable, and improve the measurement accuracy.

[0036] A communication circuit connected to the single-chip microcomputer U5, wherein the communication circuit is connected to the single-chip microcomputer U5 via a connector P1, and the other end of the communication circuit is connected to an electrostatic protection circuit;

[0037] The communication circuit includes a communication chip U1 supporting RS232 communication or RS485 communication, wherein pin 2 of the communication chip U1 is connected to a resistor R2, and pin 3 of the communication chip U1 is connected to a resistor R1, and one end of the resistor R1 and one end of the resistor R2 are respectively connected to pin 2 and pin 3 of the connector P1. Through the connection between the resistors R1 and R2, the communication chip U1 can perform reliable data transmission with an external device or system to realize the communication function;

[0038] The electrostatic protection circuit includes an electrostatic diode D2, an electrostatic diode D3 and an electrostatic diode D4 which are arranged in parallel. One end of the electrostatic diode D2 is connected to pin 1 of the connector P1, one end of the electrostatic diode D3 is connected to pin 7 of the communication chip U1, and one end of the electrostatic diode D4 is connected to pin 6 of the communication chip U1. When an electrostatic discharge event occurs, the electrostatic diode D2, the electrostatic diode D3 and the electrostatic diode D4 will absorb and release the electrostatic energy to protect the communication chip U1 from damage, improve the stability and reliability of the system, and ensure the normal operation of the communication circuit.

[0039] A power supply circuit is provided for supplying power to the single-chip microcomputer circuit, the angular velocity sensor circuit and the acceleration sensor circuit respectively, wherein the power supply circuit comprises a second filter circuit, one end of the second filter circuit is connected in parallel with a voltage conversion circuit and a voltage transmission circuit, the other end of the second filter circuit is connected with a linear low voltage dropout regulator U2, and one end of the linear low voltage dropout regulator U2 is connected with a decoupling capacitor.

[0040] The voltage conversion circuit includes a DC-DC converter power1, wherein pin 1 of the DC-DC converter power1 is connected to a resistor R4 connected to a connector P1, pin 2 of the DC-DC converter power1 is grounded, and pin 3 of the DC-DC converter power1 is connected to a second filter circuit. When the input power supply VI N is a wide voltage (7-36V), the DC-DC converter power1 performs conversion and outputs a 5V power supply;

[0041] The voltage transmission circuit includes a fuse F1 with a current limiting of 500Ma and a Schottky diode D7. The fuse F1 is connected in series with the Schottky diode D7. One end of the fuse F1 away from the Schottky diode D7 is connected to the connection end of the resistor R4 and the DC-DC converter power1. One end of the Schottky diode D7 away from the fuse F1 is connected to the connection end of the second filter circuit and the DC-DC converter power1. The transmitted voltage is protected from overvoltage by the fuse F1. The Schottky diode D7 is used to control the on-off of the transmitted voltage, so that when the input power supply VI N is a narrow voltage of 5V, it can be transmitted to the second filter circuit for filtering through the Schottky diode D7.

[0042] The second filter circuit is composed of a capacitor C1 and a capacitor C2 connected in parallel, wherein two parallel ends of the capacitor C1 and the capacitor C2 are respectively connected to pin 1 and pin 2 of the linear low voltage dropout regulator U2, and one of the connection ends of the capacitor C1 and the capacitor C2 is grounded;

[0043] The decoupling capacitor includes a capacitor C5 and a capacitor C3 and a capacitor C4 which are arranged in parallel. One of the connection ends of the capacitor C3 and the capacitor C4 is connected to the 5th pin of the linear low voltage difference regulator U2, and the other connection ends of the capacitor C3 and the capacitor C4 are grounded. One end of the capacitor C5 is connected to the 4th pin of the linear low voltage difference regulator U2, and the other end of the capacitor C5 is grounded. The capacitor C3 and the capacitor C4 are used for filtering and voltage stabilization. The linear low voltage difference regulator U2 provides a more stable voltage output when working. The capacitor C5 is used to make the linear low voltage difference regulator U2 respond faster to the fluctuation of the input voltage, thereby improving the stability and anti-interference ability of the system. During long-term use, the output signal has high stability and small drift, which improves the measurement accuracy of the gyroscope sensor to a certain extent.

[0044] The power supply circuit has two power supply modes. One is composed of a voltage conversion circuit, a second filtering circuit, a linear low voltage dropout regulator U2 and a decoupling capacitor, which can convert a 7-36V input DC voltage into a 5V AC voltage, and then provide a stable voltage to power the microcontroller circuit, angular velocity sensor circuit and acceleration sensor circuit after processing through the second filtering circuit, the linear low voltage dropout regulator U2 and the decoupling capacitor.

[0045] The other type is composed of a voltage transmission circuit, a second filtering circuit, a linear low voltage dropout regulator U2 and a decoupling capacitor, which converts the input 5V DC voltage into a 5V AC voltage, and then provides a stable voltage to power the microcontroller circuit, angular velocity sensor circuit and acceleration sensor circuit after processing through the second filtering circuit, the linear low voltage dropout regulator U2 and the decoupling capacitor, so that the gyroscope sensor circuit is suitable for a relatively wide voltage input range, thereby improving the versatility of the gyroscope sensor circuit.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. High-precision crystal gyroscope sensor circuit, characterized by: include: A single-chip microcomputer circuit, which is composed of a single-chip microcomputer U5 and a clock circuit and a backup power supply circuit connected to the single-chip microcomputer U5; An angular velocity sensing circuit connected to the single-chip computer U5, the angular velocity sensing circuit comprising a high-precision crystal gyroscope angular velocity sensing chip U4 and a filter capacitor connected to the high-precision crystal gyroscope angular velocity sensing chip U4, wherein pins 1 and 4 of the high-precision crystal gyroscope angular velocity sensing chip U4 are respectively connected to pins 16 and 18 of the single-chip computer U5; An acceleration sensing circuit connected to the single-chip computer U5, the acceleration sensing circuit comprising an acceleration sensing chip U3, the acceleration sensing chip U3 being connected to a first filtering circuit, the pin 1 and pin 10 of the acceleration sensing chip U3 being respectively connected to the pin 14 and pin 13 of a high-precision crystal gyroscope angular velocity sensor chip U4; A communication circuit connected to the single-chip microcomputer U5, wherein the communication circuit is connected to the single-chip microcomputer U5 via a connector P1, and the other end of the communication circuit is connected to an electrostatic protection circuit; A power supply circuit is provided for supplying power to the single-chip microcomputer circuit, the angular velocity sensor circuit and the acceleration sensor circuit respectively, wherein the power supply circuit comprises a second filter circuit, one end of the second filter circuit is connected in parallel with a voltage conversion circuit and a voltage transmission circuit, the other end of the second filter circuit is connected with a linear low voltage dropout regulator U2, and one end of the linear low voltage dropout regulator U2 is connected with a decoupling capacitor.

2. The high-precision crystal gyroscope sensor circuit according to claim 1, characterized in that: The clock circuit includes a crystal oscillator Y1, two ends of which are respectively connected to pins 5 and 6 of the single-chip microcomputer U5, and the other end of which is grounded.

3. The high-precision crystal gyroscope sensor circuit according to claim 2, characterized in that: The backup power supply circuit includes a battery BAT and a diode D25, one end of the diode D25 is connected to a resistor R3, one end of the resistor R3 is connected to pin 1 of the single-chip microcomputer U5, and one end of the battery BAT is connected to the connection end of the resistor R3 and the single-chip microcomputer U5, a capacitor C26 is connected between pins 1 and 44 of the single-chip microcomputer U5, and one end of the capacitor C26 away from the resistor R3 is grounded.

4. The high-precision crystal gyroscope sensor circuit according to claim 3, characterized in that: The filter capacitor includes a ground capacitor C10 and a capacitor C11. The ground capacitor C10 is connected to pin 6 of the high-precision crystal gyroscope angular velocity sensor chip U4. The capacitor C11 is connected to pin 8 of the high-precision crystal gyroscope angular velocity sensor chip U4, and the ground end of the ground capacitor C10 is connected to one end of the capacitor C11.

5. The high-precision crystal gyroscope sensor circuit according to claim 4, characterized in that: The first filtering circuit includes a ground capacitor C9 and a ground capacitor C12. The ground capacitor C9 is connected to pin 3 of the acceleration sensor chip U3. The non-grounded end of the ground capacitor C12 is respectively connected to pins 8 and 6 of the acceleration sensor chip U3.

6. The high-precision crystal gyroscope sensor circuit according to claim 5, characterized in that: The communication circuit includes a communication chip U1 supporting RS232 communication or RS485 communication, pin 2 of the communication chip U1 is connected to a resistor R2, pin 3 of the communication chip U1 is connected to a resistor R1, and one end of the resistor R1 and one end of the resistor R2 are respectively connected to pin 2 and pin 3 of the connector P1; The electrostatic protection circuit includes an electrostatic diode D2, an electrostatic diode D3 and an electrostatic diode D4 which are arranged in parallel. One end of the electrostatic diode D2 is connected to pin 1 of the connector P1, one end of the electrostatic diode D3 is connected to pin 7 of the communication chip U1, and one end of the electrostatic diode D4 is connected to pin 6 of the communication chip U1.

7. The high-precision crystal gyroscope sensor circuit according to claim 6, characterized in that: The voltage conversion circuit includes a DC-DC converter power1, pin 1 of the DC-DC converter power1 is connected to a resistor R4 connected to a connector P1, pin 2 of the DC-DC converter power1 is grounded, and pin 3 of the DC-DC converter power1 is connected to a second filtering circuit.

8. The high-precision crystal gyroscope sensor circuit according to claim 7, characterized in that: The voltage transmission circuit includes a fuse F1 with a current limiting value of 500 mA and a Schottky diode D7. The fuse F1 is connected in series with the Schottky diode D7. One end of the fuse F1 away from the Schottky diode D7 is connected to the connection end of the resistor R4 and the DC-DC converter power1. One end of the Schottky diode D7 away from the fuse F1 is connected to the connection end of the second filter circuit and the DC-DC converter power1.

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