Inductively triggered differential charge amplifier

Abstract

The utility model discloses an inductive trigger formula differential charge amplifier relates to amplifier technical field. Its main technical scheme: control module is used for with the inductive sensor on piezoelectric quartz sensor connection, first operational amplifier module is connected with control module, and first operational amplifier module is used for with piezoelectric quartz sensor connection, second operational amplifier module is connected with control module, and second operational amplifier module is used for with piezoelectric quartz sensor connection, third operational amplifier module is connected with first operational amplifier module, second operational amplifier module all connection. Expect to reach ensure in the process of signal input, do not receive external environment electromagnetic interference, power longitudinal impact, electrostatic adsorption, static electricity cumulates and many other factors influence. Further reduce the risk of causing sensor, connecting wire and charge amplifier front end to take place charge accumulation, lead to measurement drift, influence the precision of measurement, thereby realize the purpose of ultrahigh precision measurement.

Description

Technical Field

[0001] This utility model relates to the field of amplifier technology, specifically to an induction-triggered differential charge amplifier. Background Technology

[0002] Commonly used piezoelectric sensors mainly include piezoelectric thin-film sensors, piezoelectric ceramic sensors, and piezoelectric quartz sensors. Piezoelectric sensors are passive devices, and their working principle is based on the piezoelectric effect—generating a weak electrical charge signal under the action of external force. Because the output charge is extremely small, it needs to be converted and conditioned by a charge amplifier.

[0003] Among various piezoelectric sensors, piezoelectric quartz sensors are widely used in scenarios with stringent measurement accuracy requirements due to their high measurement accuracy, small temperature drift, and excellent long-term stability.

[0004] However, in practical applications, the charge amplifier corresponding to the piezoelectric quartz sensor is susceptible to environmental electromagnetic interference, longitudinal power supply impact, electrostatic adsorption, and electrostatic accumulation. This can cause charge buildup in the sensor, connecting wires, and front end of the charge amplifier, resulting in zero-point drift or measurement drift of the charge amplifier and affecting measurement accuracy. Utility Model Content

[0005] The purpose of this invention is to provide an inductively triggered differential charge amplifier, which solves the problem that the charge amplifier corresponding to the existing piezoelectric quartz sensor is susceptible to environmental electromagnetic interference, longitudinal power supply impact, electrostatic adsorption, electrostatic accumulation and other factors, which cause charge accumulation in the sensor, connecting wires and front end of the charge amplifier, resulting in zero drift or measurement drift of the charge amplifier and affecting the measurement accuracy.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An induction-triggered differential charge amplifier includes a control module, a first operational amplifier module, a second operational amplifier module, and a third operational amplifier module. The input terminal of the control module is connected to an inductive sensor on a piezoelectric quartz sensor. The input terminal of the first operational amplifier module is connected to the output terminal of the control module and is also connected to the piezoelectric quartz sensor. The input terminal of the second operational amplifier module is connected to the output terminal of the control module and is also connected to the shielding layer of the piezoelectric quartz sensor's outer shell. The input terminal of the third operational amplifier module is connected to the output terminals of both the first and second operational amplifier modules.

[0008] A further technical solution is as follows: the control module includes a control chip IC1; the control chip IC1 is an STC89C52RC-LQFP44; pin 1 of the control chip IC1 is connected to the input terminal of the first operational amplifier module; pin 2 of the control chip IC1 is connected to the input terminal of the second operational amplifier module; pins 15 and 16 of the control chip IC1 are both used to connect to the inductive sensor on the piezoelectric quartz sensor.

[0009] A further technical solution is as follows: The first operational amplifier module includes an operational amplifier IC2, a first optocoupler switch, a resistor R1, a capacitor C1, and a resistor R3; one end of the resistor R1 is used to connect to the piezoelectric quartz sensor; the other end of the resistor R1 is connected to the output terminal of the first optocoupler switch, pin 2 of the operational amplifier IC2, and one end of the capacitor C1; the input terminal of the first optocoupler switch is connected to pin 1 of the control chip IC1; pin 7 of the operational amplifier IC2 is used to connect to the positive input power supply V+; pin 5 of the operational amplifier IC2 is used to connect to the negative input power supply V-; pin 6 of the operational amplifier IC2 is connected to the output terminal of the first optocoupler switch, the other end of the capacitor C1, and one end of the resistor R3; the other end of the resistor R3 is connected to the input terminal of the third operational amplifier module.

[0010] A further technical solution is as follows: The first optocoupler switch includes an optocoupler U1, resistors R20, R21, R22, and R23; pin 1 of the optocoupler U1 is connected to one end of resistor R21; the other end of resistor R21 is connected to pin 1 of the control chip IC1; pin 2 of the optocoupler U1 is connected to one end of resistor R20; the other end of resistor R20 is connected to GND; pin 3 of the optocoupler U1 is connected to one end of resistor R23; the other end of resistor R23 is connected to the other end of resistor R1; pin 4 of the optocoupler U1 is connected to one end of resistor R22; the other end of resistor R22 is connected to pin 6 of the operational amplifier IC2.

[0011] A further technical solution is as follows: The second operational amplifier module includes an operational amplifier IC3, a second optocoupler switch, a resistor R15, a capacitor C6, and a resistor R16; one end of the resistor R15 is connected to the outer shielding layer of the piezoelectric quartz sensor; the other end of the resistor R15 is connected to the output terminal of the second optocoupler switch, pin 2 of the operational amplifier IC3, and one end of the capacitor C6; the input terminal of the second optocoupler switch is connected to pin 2 of the control chip IC1; pin 7 of the operational amplifier IC3 is connected to the positive input power supply V+; pin 5 of the operational amplifier IC3 is connected to the negative input power supply V-; pin 6 of the operational amplifier IC3 is connected to the output terminal of the second optocoupler switch, the other end of the capacitor C6, and one end of the resistor R16; the other end of the resistor R16 is connected to the input terminal of the third operational amplifier module.

[0012] A further technical solution is as follows: the second optocoupler switch includes an optocoupler U2, resistors R24, R26, R27, and R28; pin 1 of the optocoupler U1 is connected to one end of resistor R27; the other end of resistor R27 is connected to pin 2 of the control chip IC1; pin 2 of the optocoupler U1 is connected to one end of resistor R25; the other end of resistor R25 is connected to GND; pin 3 of the optocoupler U1 is connected to one end of resistor R24; the other end of resistor R24 ​​is connected to the other end of resistor R15; pin 4 of the optocoupler U1 is connected to one end of resistor R26; the other end of resistor R26 is connected to pin 6 of the operational amplifier IC3.

[0013] A further technical solution is as follows: The third operational amplifier module includes operational amplifier IC4, resistor R7, capacitor C3, resistor R8, resistor R9, resistor R10, resistor R12, resistor R13, and capacitor C4; pin 8 of operational amplifier IC4 is connected to the positive input power supply V+; pin 4 of operational amplifier IC4 is connected to the negative input power supply V-; pin 2 of the operational amplifier is connected to one end of resistor R7, one end of capacitor C3, and one end of resistor R8; the other end of resistor R7 is connected to the other end of resistor R3; the operational amplifier IC4... Pin 1 of C4 is connected to the other end of capacitor C3, the other end of resistor R8, and one end of resistor R10; pin 3 of operational amplifier IC4 is connected to the other end of resistor R16; pin 6 of operational amplifier IC4 is connected to the other end of resistor R10, one end of capacitor C4, and one end of resistor R9; pin 7 of operational amplifier IC4 is connected to the other end of capacitor C4 and one end of resistor R12; the other end of resistor R12 is connected to the other end of resistor R9 and one end of resistor R13; the other end of resistor R13 is used to output amplified signals.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] On the one hand, the goal is to ensure that the output voltage starts at zero when a signal is input, thereby reducing the complexity of subsequent processing circuits and algorithms, improving efficiency, and eliminating the need for a floating baseline, thus simplifying the circuitry. On the other hand, the goal is to ensure that the sensor output can reach its maximum range while maintaining accuracy, without causing linearity distortion in signal amplification due to zero-point drift. Furthermore, the goal is to ensure that during signal input, the sensor is unaffected by external electromagnetic interference, power supply longitudinal shocks, electrostatic adsorption, electrostatic accumulation, and other factors. This reduces the risk of charge buildup on the sensor, connecting wires, and the front end of the charge amplifier, leading to measurement drift and affecting measurement accuracy, thereby achieving ultra-high precision measurement. Attached Figure Description

[0016] Figure 1 This is an electrical block diagram of an induction-triggered differential charge amplifier in this embodiment;

[0017] Figure 2 This is a circuit topology diagram of an induction-triggered differential charge amplifier in this embodiment.

[0018] The attached diagram shows the markings and corresponding component names:

[0019] 100 - Control module; 200 - First operational amplifier module; 300 - Second operational amplifier module; 400 - Third operational amplifier module. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Example 1: This example provides an induction-triggered differential charge amplifier, such as... Figures 1-2 As shown, the system includes a control module 100, a first operational amplifier module 200, a second operational amplifier module 300, and a third operational amplifier module 400. The input terminal of the control module 100 is connected to the inductive sensor on the piezoelectric quartz sensor. The input terminal of the first operational amplifier module 200 is connected to the output terminal of the control module 100 and is also connected to the piezoelectric quartz sensor. The input terminal of the second operational amplifier module 300 is connected to the output terminal of the control module 100 and is also connected to the outer shell shielding layer of the piezoelectric quartz sensor. The input terminal of the third operational amplifier module 400 is connected to the output terminals of both the first and second operational amplifier modules 200 and 300.

[0022] In this embodiment, as Figure 2 As shown, the control module 100 includes a control chip IC1; the control chip IC1 is an STC89C52RC-LQFP44; pin 1 of the control chip IC1 is connected to the input terminal of the first operational amplifier module 200; pin 2 of the control chip IC1 is connected to the input terminal of the second operational amplifier module 300; pins 15 and 16 of the control chip IC1 are both used to connect to the inductive sensor on the piezoelectric quartz sensor.

[0023] In this embodiment, as Figure 2 As shown, the first operational amplifier module 200 includes an operational amplifier IC2, a first optocoupler switch, a resistor R1, a capacitor C1, and a resistor R3. One end of the resistor R1 is connected to a piezoelectric quartz sensor. The other end of the resistor R1 is connected to the output terminal of the first optocoupler switch, pin 2 of the operational amplifier IC2, and one end of the capacitor C1. The input terminal of the first optocoupler switch is connected to pin 1 of the control chip IC1. Pin 7 of the operational amplifier IC2 is connected to the positive input power supply V+. Pin 5 of the operational amplifier IC2 is connected to the negative input power supply V-. Pin 6 of the operational amplifier IC2 is connected to the output terminal of the first optocoupler switch, the other end of the capacitor C1, and one end of the resistor R3. The other end of the resistor R3 is connected to the input terminal of the third operational amplifier module 400.

[0024] In this embodiment, as Figure 2 As shown, the first optocoupler switch includes an optocoupler U1, resistors R20, R21, R22, and R23; pin 1 of the optocoupler U1 is connected to one end of resistor R21; the other end of resistor R21 is connected to pin 1 of the control chip IC1; pin 2 of the optocoupler U1 is connected to one end of resistor R20; the other end of resistor R20 is connected to GND; pin 3 of the optocoupler U1 is connected to one end of resistor R23; the other end of resistor R23 is connected to the other end of resistor R1; pin 4 of the optocoupler U1 is connected to one end of resistor R22; the other end of resistor R22 is connected to pin 6 of the operational amplifier IC2.

[0025] In this embodiment, as Figure 2As shown, the second operational amplifier module 300 includes an operational amplifier IC3, a second optocoupler switch, a resistor R15, a capacitor C6, and a resistor R16. One end of the resistor R15 is connected to the outer shielding layer of the piezoelectric quartz sensor. The other end of the resistor R15 is connected to the output terminal of the second optocoupler switch, pin 2 of the operational amplifier IC3, and one end of the capacitor C6. The input terminal of the second optocoupler switch is connected to pin 2 of the control chip IC1. Pin 7 of the operational amplifier IC3 is connected to the positive input power supply V+. Pin 5 of the operational amplifier IC3 is connected to the negative input power supply V-. Pin 6 of the operational amplifier IC3 is connected to the output terminal of the second optocoupler switch, the other end of the capacitor C6, and one end of the resistor R16. The other end of the resistor R16 is connected to the input terminal of the third operational amplifier module 400.

[0026] In this embodiment, as Figure 2 As shown, the second optocoupler switch includes an optocoupler U2, resistors R24, R26, R27, and R28. Pin 1 of the optocoupler U1 is connected to one end of resistor R27; the other end of resistor R27 is connected to pin 2 of the control chip IC1; pin 2 of the optocoupler U1 is connected to one end of resistor R25; the other end of resistor R25 is connected to GND; pin 3 of the optocoupler U1 is connected to one end of resistor R24; the other end of resistor R24 ​​is connected to the other end of resistor R15; pin 4 of the optocoupler U1 is connected to one end of resistor R26; the other end of resistor R26 is connected to pin 6 of the operational amplifier IC3.

[0027] In this embodiment, as Figure 2As shown, the third operational amplifier module 400 includes operational amplifier IC4, resistor R7, capacitor C3, resistor R8, resistor R9, resistor R10, resistor R12, resistor R13, and capacitor C4; pin 8 of operational amplifier IC4 is connected to the positive input power supply V+; pin 4 of operational amplifier IC4 is connected to the negative input power supply V-; pin 2 of operational amplifier IC4 is connected to one end of resistor R7, one end of capacitor C3, and one end of resistor R8; the other end of resistor R7 is connected to the other end of resistor R3; operational amplifier IC4... Pin 1 of the operational amplifier IC4 is connected to the other end of capacitor C3, the other end of resistor R8, and one end of resistor R10; pin 3 of the operational amplifier IC4 is connected to the other end of resistor R16; pin 6 of the operational amplifier IC4 is connected to the other end of resistor R10, one end of capacitor C4, and one end of resistor R9; pin 7 of the operational amplifier IC4 is connected to the other end of capacitor C4 and one end of resistor R12; the other end of resistor R12 is connected to the other end of resistor R9 and one end of resistor R13; the other end of resistor R13 is used to output the amplified signal.

[0028] The working principle of the induction-triggered differential charge amplifier in this embodiment is as follows: When the induction sensor on the piezoelectric quartz sensor does not detect any external force applied to it, the control module 100 controls the first operational amplifier module 200 and the second operational amplifier module 300 to be in a reset state. At this time, the outputs of the first operational amplifier module 200 and the second operational amplifier module 300 are both 0, making the output of the third operational amplifier module 400 0, which remains unchanged. When the induction sensor on the piezoelectric quartz sensor detects that an external force is about to be applied to it, the control module 100 controls the first operational amplifier module 200 and the second operational amplifier module 300 to be in an operating state. At this time, the first operational amplifier module 200 performs IV conversion on the integrated pressure signal of the piezoelectric quartz sensor, and the second operational amplifier module 300 performs IV conversion on the integrated signal of the outer shell shielding layer (wire shielding layer) of the piezoelectric quartz sensor. After IV conversion, the integrated pressure signal and the integrated signal of the outer shell shielding layer (wire shielding layer) are transmitted to the third operational amplifier module 400 for differential amplification output. On the one hand, the goal is to ensure that the output voltage starts at zero when a signal is input, thereby reducing the complexity of subsequent processing circuits and algorithms, improving efficiency, and eliminating the need for a floating baseline, thus simplifying the circuitry. On the other hand, the goal is to ensure that the sensor output can reach its maximum range while maintaining accuracy, without causing linearity distortion in signal amplification due to zero-point drift. Furthermore, the goal is to ensure that during signal input, the sensor is unaffected by external electromagnetic interference, power supply longitudinal shocks, electrostatic adsorption, electrostatic accumulation, and other factors. This reduces the risk of charge buildup on the sensor, connecting wires, and the front end of the charge amplifier, leading to measurement drift and affecting measurement accuracy, thereby achieving ultra-high precision measurement.

[0029] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. An induction-triggered differential charge amplifier, characterized in that, include: A control module (100) is provided, the input of which is connected to the inductive sensor on the piezoelectric quartz sensor. The first operational amplifier module (200) has its input terminal connected to the output terminal of the control module (100), and its input terminal is used to connect to the piezoelectric quartz sensor. The second operational amplifier module (300) has its input terminal connected to the output terminal of the control module (100), and its input terminal is used to connect to the outer shell shielding layer of the piezoelectric quartz sensor. The third operational amplifier module (400) is connected to the output of the first operational amplifier module (200) and the output of the second operational amplifier module (300).

2. The induction-triggered differential charge amplifier according to claim 1, characterized in that: The control module (100) includes a control chip IC1; The control chip IC1 is an STC89C52RC-LQFP44; Pin 1 of the control chip IC1 is connected to the input terminal of the first operational amplifier module (200); Pin 2 of the control chip IC1 is connected to the input terminal of the second operational amplifier module (300); Pins 15 and 16 of the control chip IC1 are both used to connect to the inductive sensor on the piezoelectric quartz sensor.

3. The inductively triggered differential charge amplifier according to claim 2, characterized in that: The first operational amplifier module (200) includes an operational amplifier IC2, a first optocoupler switch, a resistor R1, a capacitor C1, and a resistor R3; One end of the resistor R1 is used to connect to the piezoelectric quartz sensor; The other end of the resistor R1 is connected to the output terminal of the first optocoupler switch, pin 2 of the operational amplifier IC2, and one end of the capacitor C1. The input terminal of the first optocoupler switch is connected to pin 1 of the control chip IC1; Pin 7 of the operational amplifier IC2 is used to connect to the positive input power supply V+; Pin 5 of the operational amplifier IC2 is used to connect to the negative terminal V- of the input power supply; Pin 6 of the operational amplifier IC2 is connected to the output terminal of the first optocoupler switch, the other end of capacitor C1, and one end of resistor R3. The other end of the resistor R3 is connected to the input terminal of the third operational amplifier module (400).

4. The inductively triggered differential charge amplifier according to claim 3, characterized in that: The first optocoupler switch includes an optocoupler U1, a resistor R20, a resistor R21, a resistor R22, and a resistor R23; Pin 1 of the optocoupler U1 is connected to one end of resistor R21; The other end of the resistor R21 is connected to pin 1 of the control chip IC1; Pin 2 of the optocoupler U1 is connected to one end of resistor R20; The other end of the resistor R20 is connected to GND; Pin 3 of the optocoupler U1 is connected to one end of resistor R23; The other end of resistor R23 is connected to the other end of resistor R1; Pin 4 of the optocoupler U1 is connected to one end of resistor R22; The other end of the resistor R22 is connected to pin 6 of the operational amplifier IC2.

5. The inductively triggered differential charge amplifier according to claim 3 or 4, characterized in that: The second operational amplifier module (300) includes an operational amplifier IC3, a second optocoupler switch, a resistor R15, a capacitor C6, and a resistor R16; One end of the resistor R15 is used to connect to the outer shell shielding layer of the piezoelectric quartz sensor; The other end of the resistor R15 is connected to the output terminal of the second optocoupler switch, pin 2 of the operational amplifier IC3, and one end of the capacitor C6. The input terminal of the second optocoupler switch is connected to pin 2 of the control chip IC1; Pin 7 of the operational amplifier IC3 is used to connect to the positive input power supply V+; Pin 5 of the operational amplifier IC3 is used to connect to the negative terminal of the input power supply V-. Pin 6 of the operational amplifier IC3 is connected to the output terminal of the second optocoupler switch, the other end of capacitor C6, and one end of resistor R16. The other end of the resistor R16 is connected to the input terminal of the third operational amplifier module (400).

6. The inductively triggered differential charge amplifier according to claim 5, characterized in that: The second optocoupler switch includes an optocoupler U2, resistors R24, R26, and R27; Pin 1 of the optocoupler U1 is connected to one end of resistor R27; The other end of the resistor R27 is connected to pin 2 of the control chip IC1; Pin 2 of the optocoupler U1 is connected to one end of resistor R25; The other end of the resistor R25 is connected to GND; Pin 3 of the optocoupler U1 is connected to one end of resistor R24; The other end of resistor R24 ​​is connected to the other end of resistor R15; Pin 4 of the optocoupler U1 is connected to one end of resistor R26; The other end of the resistor R26 is connected to pin 6 of the operational amplifier IC3.

7. The inductively triggered differential charge amplifier according to claim 5, characterized in that: The third operational amplifier module (400) includes operational amplifier IC4, resistor R7, capacitor C3, resistor R8, resistor R9, resistor R10, resistor R12, resistor R13 and capacitor C4; Pin 8 of the operational amplifier IC4 is used to connect to the positive input power supply V+; Pin 4 of the operational amplifier IC4 is used as the input power supply negative terminal V-; Pin 2 of the operational amplifier is connected to one end of resistor R7, one end of capacitor C3, and one end of resistor R8. The other end of resistor R7 is connected to the other end of resistor R3; Pin 1 of the operational amplifier IC4 is connected to the other end of capacitor C3, the other end of resistor R8, and one end of resistor R10. Pin 3 of the operational amplifier IC4 is connected to the other end of resistor R16; Pin 6 of the operational amplifier IC4 is connected to the other end of resistor R10, one end of capacitor C4, and one end of resistor R9. Pin 7 of the operational amplifier IC4 is connected to the other end of capacitor C4 and one end of resistor R12. The other end of resistor R12 is connected to the other end of resistor R9 and one end of resistor R13. The other end of the resistor R13 is used to output an amplified signal.

Images