Adjustable sensor signal gain system and sensor

Abstract

The utility model discloses an adjustable sensor signal gain system and a sensor, the adjustable sensor signal gain system comprises a gain module, a feedback acquisition module, a bias voltage zero point adjustment module and a master control module, the gain module is used for gaining an input signal and outputting a gain signal; a feedback acquisition module is arranged at the rear stage of the gain module and is used for feeding back a gain signal to the main control module; the bias voltage zero-point adjusting module is arranged between the gain module and the main control module, and the bias voltage zero-point adjusting module is used for compensating and adjusting the bias voltage of the gain module; and the main control module is used for acquiring a feedback signal of the feedback acquisition module and controlling the bias voltage zero point adjustment module to carry out compensation adjustment. According to the utility model, the bias voltage zero point adjusting module and the master control module are arranged, and the master control module compares two paths of output signals and controls the bias voltage zero point adjusting module to enable the two paths of output signals to be equal in a static state, so that static saturation is eliminated, and normal action of the gain module is ensured.

Description

Technical Field

[0001] This utility model relates to the field of bridge signal amplification technology, and more specifically, to an adjustable sensor signal gain system and a sensor. Background Technology

[0002] A bridge signal amplifier primarily converts non-electrical quantities into electrical signals and amplifies those signals. In non-electrical quantity measuring instruments, resistance sensors are commonly used to detect non-electrical quantities such as temperature, pressure, and displacement. These sensors are connected via a bridge circuit to convert the measured non-electrical quantity into voltage or current signals, which are then further amplified by an amplifier to ultimately output a usable electrical signal.

[0003] The external bridge signal has two inputs to the amplifier circuit. In the static state (i.e. when the bridge signal does not change), there will be a slight difference between the two signals. After high amplification, the difference will be relatively large, which may cause the amplified signal to saturate. When the bridge signal changes, the useful signal cannot be amplified because of signal saturation.

[0004] The above shortcomings need to be improved. Utility Model Content

[0005] To solve or alleviate the problem of static saturation in the existing bridge signal amplification circuit, this invention provides an adjustable sensor signal gain system and a sensor.

[0006] The technical solution of this utility model is as follows:

[0007] An adjustable sensor signal gain system, comprising:

[0008] A gain module, which is used to gain the input signal and output a gain signal;

[0009] A feedback acquisition module is provided after the gain module, and the feedback acquisition module is used to feed back the gain signal to the main control module;

[0010] A bias voltage zero-point adjustment module is provided, which is located between the gain module and the main control module. The bias voltage zero-point adjustment module is used to compensate and adjust the bias voltage of the gain module.

[0011] The main control module is used to acquire the feedback signal from the feedback acquisition module and control the bias voltage zero-point adjustment module to perform compensation adjustment.

[0012] Furthermore, a signal enhancement module is provided between the gain module and the feedback acquisition module. The signal enhancement module is used to filter, reduce noise, and buffer the gain signal output by the gain module, and output an enhanced signal. The feedback acquisition module is used to feed the enhanced signal back to the main control module.

[0013] Furthermore, it also includes a gain switching module, which includes multiple gain units. Each gain unit can be selectively connected to the gain module to adjust the gain ratio. The gain units correspond to different gain ratios. The main control module selects the gain unit connected to the gain module to select the gain ratio.

[0014] Furthermore, the gain switching module includes a microcontroller that is communicatively connected to the main control module, each gain unit is a resistor with a different resistance value, and each gain unit is connected to a control pin of the microcontroller.

[0015] Furthermore, the main control module is connected to a control module, which is used to control the bias voltage zero-point adjustment module to perform zero-point adjustment and select the gain unit.

[0016] Furthermore, the control module includes a remote control unit, which is used to remotely control the bias voltage zero-point adjustment module to perform zero-point adjustment.

[0017] Furthermore, the control module includes a local control unit, which is used to manually control the bias voltage zero-point adjustment module to perform zero-point adjustment or select the gain unit.

[0018] Furthermore, the local control unit includes several buttons.

[0019] Furthermore, the main control module is connected to a status display module, which is used to display the status of the control module.

[0020] A sensor that utilizes the aforementioned adjustable sensor signal gain system.

[0021] According to the above-described solution, the beneficial effect of this utility model is that by setting up a bias voltage zero-point adjustment module and a main control module, the main control module compares the two output signals and controls the bias voltage zero-point adjustment module to make the two output signals equal in static state, thereby eliminating static saturation and ensuring the normal operation of the gain module. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a system topology diagram of the present invention;

[0024] Figure 2 This is the circuit schematic diagram of the main control module in this utility model;

[0025] Figure 3 This is the circuit schematic diagram of the gain module in this utility model;

[0026] Figure 4 This is a circuit diagram of the gain switching module in this utility model;

[0027] Figure 5 This is a circuit diagram of the signal enhancement module in this utility model;

[0028] Figure 6 This is a circuit diagram of the feedback acquisition module in this utility model;

[0029] Figure 7 This is a circuit diagram of the bias voltage zero-point adjustment module in this utility model;

[0030] Figure 8 This is a circuit diagram of the remote control unit module of this utility model;

[0031] Figure 9 This is a circuit diagram of the local control unit in this utility model;

[0032] Figure 10 This is a circuit diagram of the status display module in this utility model;

[0033] Figure 11 This is the circuit schematic diagram of the power supply module in this utility model.

[0034] The following are the labeling elements in the figure: 1. Main control module; 2. Gain switching module; 201. Gain unit; 202. Microcontroller; 3. Gain module; 4. Signal enhancement module; 5. Feedback acquisition module; 6. Bias voltage zero-point adjustment module; 7. Control module; 701. Remote control unit; 702. Local control unit; 8. Status display module; 9. Power supply module. Detailed Implementation

[0035] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0036] It should be noted that when a component is referred to as "fixed," "set," or "connected" to another component, it may be located directly or indirectly on that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first," "second," etc., are used for ease of description only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "Many" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0037] like Figure 1 As shown in one embodiment of the present invention, an adjustable sensor signal gain system includes a gain module 3, a gain switching module 2, and a main control module 1. The gain module 3 is used to gain the input signal and output a gain signal. The gain switching module 2 includes multiple gain units 201, each of which can be selectively connected to the gain module 3 to adjust the gain ratio. The gain units 201 correspond to different gain ratios. The main control module 1 selects the gain unit 201 connected to the gain module 3 to select the gain ratio.

[0038] Gain switching module 2 contains multiple gain units 201 with different gain ratios. Each gain unit 201 can be selectively connected to gain module 3 as needed to adjust the overall gain ratio. During operation, main control module 1 intelligently selects and connects the corresponding gain unit 201 based on the sensor type and the strength of the input bridge signal, thereby achieving flexible adjustment of the gain ratio. When the bridge signal is weak, main control module 1 selects the gain unit 201 with a higher gain ratio; conversely, when the bridge signal is strong, it selects the gain unit 201 with a lower gain ratio to ensure the stability and accuracy of the output signal. The electrical signal converted from non-electrical parameters by the sensor is input to gain module 3. Gain module 3 performs gain processing on the input signal and outputs a gain signal.

[0039] In this embodiment, the adjustable sensor signal gain system, through the inclusion of a gain switching module 2 and a main control module 1, achieves intelligent selection and flexible adjustment of the gain ratio, improving the system's adaptability to bridge signals of varying strengths and ensuring the stability and reliability of the output signal. Simultaneously, the system can automatically select the most suitable gain ratio based on different signal strengths, avoiding signal distortion or saturation problems caused by inappropriate gain. Furthermore, the gain unit 201 in this system is modularly designed, facilitating expansion and maintenance, and providing convenience for subsequent upgrades and optimizations.

[0040] Specifically, such as Figure 3 As shown, gain module 3 includes operational amplifiers U8.1, U8.2, U7.1, and U9. The external bridge signal has two paths: one is input to the positive input terminal of operational amplifier U8.1, with resistor R9 connected between the inverting input and output terminals of operational amplifier U8.1; gain switching module 2 is connected between the inverting input terminal of operational amplifier U8.1 and resistor R9. The other external bridge signal is input to the non-inverting input terminal of operational amplifier U8.2, with resistor R40 connected between the inverting input and output terminals of operational amplifier U8.1. The inverting input terminal of operational amplifier U7.1 is connected to the output terminal of operational amplifier U8.1 via resistor R5, and resistor R4 is connected between the inverting input and output terminals of operational amplifier U7.1. The non-inverting input terminal of operational amplifier U7.1 is connected to the output terminal of operational amplifier U8.2 via resistor R6. The inverting input of operational amplifier U9 is connected to the output of operational amplifier 7.1 via resistor R80. Resistor R81 is connected between the inverting input and output of operational amplifier U9. The non-inverting input of operational amplifier U9 is connected to the reference voltage of power supply module 9.

[0041] like Figure 11 As shown, power module 9 includes a first power module 9U3 for outputting a first voltage and a second power module 9U1 for outputting a second voltage. The first power module 9U3 is model DS8241-50S5, and the second power module 9U1 is model WL2851E33-5 / TR. The first voltage is 5V, and the second voltage is 3.3V, used to power different devices in the system. The output pin of the second power module 9U1 is connected to a third power module 9, which outputs a third voltage of 2.5V. This third voltage is the reference voltage connected to the positive input terminal of operational amplifier U9. The output terminal of the third power module 9 is connected to the positive input terminal of operational amplifier U6.1. The inverting input terminal of operational amplifier U6.1 is connected to its output terminal, and the output terminal of operational amplifier U6.1 outputs a signal VOUT2.5.

[0042] like Figures 2 to 4As shown, in a preferred embodiment, the gain switching module 2 includes a microcontroller 202 that is communicatively connected to the main control module 1, each gain unit 201 is a resistor with a different resistance value, and each gain unit 201 is connected to each control pin of the microcontroller 202.

[0043] Specifically, the microcontroller 202 is an analog switch chip U4 with the model number TMUX6208PWR, and the main control module 1 is a microprocessor U5 with the model number STM32F103C38T6. The specific models of the analog switch chip U4 and the microprocessor U5 can be selected as needed and are not limited to the listed models.

[0044] The A0, A1, and A2 pins of the analog switch chip U4 are connected to the PA5, PA6, and PA7 pins of the main control module 1. The S1, S2, S3, S4, and S5 pins of the analog switch chip U4 are respectively connected to the first gain unit 201, the second gain unit 201, the third gain unit 201, the fourth gain unit 201, the fifth gain unit 201, and the sixth gain unit 201. The first gain unit 201 includes resistor R12, which is left blank, and has a gain ratio of 1. The second gain unit 201 includes resistor R13, which has a gain ratio of 49.9kΩ, and has a gain ratio of 2. The third gain unit 201 includes resistors R14 and R79 connected in series, with R14 having a gain ratio of 12kΩ and R79 having a gain ratio of 470Ω, and has a gain ratio of 5. The fourth gain unit 201 includes resistors R15 and R78 connected in series, with R15 having a gain ratio of 5.1kΩ and R78 having a gain ratio of 430Ω, and has a gain ratio of 10. The fifth gain unit 201 includes resistors R16 and R77 connected in parallel, with R14 having a gain ratio of 2.7kΩ and R77 having a gain ratio of 91kΩ, and has a gain ratio of 20. The sixth gain unit 201 includes resistors R17 and R83 connected in series, with R17 having a gain ratio of 1kΩ and R83 having a gain ratio of 10Ω, and has a gain ratio of 50.

[0045] The microprocessor U5 outputs a corresponding control signal to the analog switch chip U4, which then switches to the corresponding gain level and connects to the corresponding resistor. Since the gain unit 201 is composed of resistors of different values ​​and is switched via the analog switch chip, the system structure is simple, easy to implement, and easy to maintain. Furthermore, this design allows the system to be easily expanded with more gain units 201 to meet the needs of different application scenarios.

[0046] like Figure 5 As shown, in a preferred embodiment, a signal enhancement module 4 is provided after the gain module 3. The signal enhancement module 4 is used to filter, reduce noise, and buffer the gain signal output by the gain module 3, and output an enhanced signal.

[0047] Specifically, signal enhancement module 4 includes an operational amplifier follower circuit, which comprises an operational amplifier 7.2. The positive input of operational amplifier 7.2 is connected to two series-connected first-order RC low-pass filters, forming a second-order active low-pass filter. The inverting input of operational amplifier 7.2 is connected to capacitor C9, and the inverting input is also connected to the output. The output of operational amplifier 7.2 outputs the enhanced signal. In this circuit, operational amplifier 7.2 and the external resistors and capacitors constitute a second-order low-pass active filter, which also functions as a voltage follower. The analog signal is buffered by the operational amplifier follower circuit, improving its driving capability.

[0048] In this embodiment, the high-frequency noise and interference in the input signal are effectively removed through the filtering and noise reduction process of the second-order active low-pass filter, thereby improving the signal-to-noise ratio. Secondly, the operational amplifier follower circuit ensures stable signal transmission, reduces signal attenuation and distortion during transmission, and improves the signal's driving capability, enabling the enhanced signal to drive subsequent circuits more stably and efficiently.

[0049] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, in a preferred embodiment, a feedback acquisition module 5 is provided after the signal enhancement module 4, and the feedback acquisition module 5 is used to feed back the enhanced signal to the main control module 1.

[0050] Specifically, the output of the signal enhancement module 4's arithmetic amplifier U7.2 is connected to the PA2 pin of the microprocessor U5.

[0051] The gain module 3 is connected to the bias voltage zero-point adjustment module 6. The main control module 1 controls the bias voltage zero-point adjustment module 6 to compensate and adjust the bias voltage of the gain module 3 according to the feedback signal of the feedback acquisition module 5.

[0052] Specifically, the bias voltage zero-point adjustment module 6 includes an operational amplifier U6.2. The output of operational amplifier U6.2 is connected to the non-inverting input of operational amplifier U7.1. A resistor R30 is connected between the inverting input and output of operational amplifier U6.2. The microprocessor U5 is connected to the non-inverting input of operational amplifier U6.2. Resistors R22, R24, R29, R36, R42, R48, R52, R56, R60, R23, R28, R35, R41, R47, R51, R55, and R59 are connected sequentially to the non-inverting input of operational amplifier U6.2. The other end of resistor R59 is grounded. The PB0 pin of microprocessor U5 is connected between resistors R59 and R55 via resistor R58. The PB1 pin is connected between resistors R51 and R55 via resistor R53. The PB2 pin is connected between resistors R47 and R51 via resistor R49. The PB3 pin is connected between resistors R41 and R47 via resistor R44. The PB4 pin is connected between resistors R35 and R41 via resistor R38. The PB5 pin is connected between resistors R28 and R35 via resistor R33. The PB6 pin is connected between resistors R23 and R28 via resistor R25. Pin PB7 is connected between resistors R60 and R23 via resistor R20; pin PB8 is connected between resistors R56 and R60 via resistor R57; pin PB9 is connected between resistors R52 and R56 via resistor R54; pin PB10 is connected between resistors R48 and R52 via resistor R50; pin PB11 is connected between resistors R42 and R48 via resistor R45; pin PB12 is connected between resistors R36 and R42 via resistor R39; pin PB13 is connected between resistors R29 and R36 via resistor R34; pin PB14 is connected between resistors R24 and R29 via resistor R26; and pin PB15 is connected between resistors R22 and R24 via resistor R21.

[0053] Zeroing is the process of ensuring that the output signal is equal to the voltage VOUT2.5 in the static state. Microprocessor U5 acquires the amplified output signal VOUT1 and compares it with the output voltage at VOUT2.5. If VOUT1 and VOUT2.5 are equal, the zeroing process ends; otherwise, microprocessor U5 adjusts the VBIAS voltage via operational amplifier U6.2 through different outputs of control pins PB0-PB15. The VBIAS voltage is fed back to operational amplifier U7.1, thus changing the output signal VOUT1. Microprocessor U5 then acquires VOUT1 again and compares it with VOUT2.5 until VOUT1 and VOUT2.5 are equal. The external bridge signal has two inputs to gain module 3. In the static state (i.e., when there is no signal change in the bridge), the two signals will have slight differences. After high amplification, these differences will become significant, potentially leading to signal saturation. When there is a signal change in the bridge, signal saturation prevents the amplified signal from being amplified further; therefore, zeroing is performed to eliminate static saturation.

[0054] like Figure 2 , Figure 8 and Figure 9 As shown, in a preferred embodiment, the main control module 1 is connected to a control module 7, which is used to control the bias voltage zero-point adjustment module 6 to perform zero-point adjustment and select the gain unit 201.

[0055] The control module 7 includes a remote control unit 701, which is used to remotely control the bias voltage zero-point adjustment module 6 to perform zero-point adjustment.

[0056] The remote control unit 701 sends an automatic zeroing signal to the PA3 pin of the microprocessor U5.

[0057] The control module 7 includes a local control unit 702, which is used to manually control the bias voltage zero-point adjustment module 6 to perform zero-point adjustment or select the gain unit 201.

[0058] The local control unit 702 includes a button SW1, which is connected to the PA4 pin of the microprocessor U5. A short press of button SW1 sequentially switches the gain unit 201; a long press of button SW1 for more than 5 seconds initiates a reset to zero.

[0059] In this embodiment, flexible control of the bias voltage zero-point adjustment module 6 and the gain unit 201 is achieved by combining remote control and local control. The remote control function allows users to monitor the system status and make necessary adjustments anytime, anywhere, without geographical restrictions, making operation convenient. The local control function provides users with direct operation means, allowing them to switch the gain unit 201 or perform a zero-point operation as needed.

[0060] like Figure 2 and Figure 10 As shown, in a preferred embodiment, the main control module 1 is connected to a status display module 8, which is used to display the status of the control module 7.

[0061] Specifically, the status display module 8 includes indicator lights LED1, LED2, LED3, LED4, LED5, and LED6. These indicator lights are connected to pins PA8, PA9, PA10, PA11, PA12, and PA15 of the microprocessor U5, respectively, with the other end connected to a 3.3V power supply. LED1, LED2, LED3, LED4, LED5, and LED6 indicate the gain of the gain module at 31x, 2x, 5x, 10x, 20x, and 50x, respectively.

[0062] When the control module 7 selects different gain units 201, the microprocessor U5 will send signals to the corresponding indicator lights through the corresponding pins according to the current gain setting. For example, if the gain module 3 is set to 1x gain, the microprocessor U5 will light up indicator light LED1 through pin PA8; if it is set to 2x gain, it will light up LED2, and so on.

[0063] In this embodiment, by setting up a status display module 8, users can easily view the working status of the gain module 3, which significantly improves the readability and user-friendliness of the system.

[0064] One embodiment of this utility model describes a sensor that utilizes the aforementioned adjustable sensor signal gain system.

[0065] In this embodiment, intelligent gain switching and precise gain adjustment enable its application to various sensors. Secondly, the filtering, noise reduction, and buffering functions of the signal enhancement module 4 improve the signal-to-noise ratio and stability, significantly enhancing the measurement accuracy and reliability of the sensor. Simultaneously, the dual control methods of the remote control unit 701 and the local control unit 702 provide users with more flexible and convenient operation. Furthermore, the introduction of the status display module 8 provides users with intuitive visual feedback, simplifying the operation process and improving work efficiency.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable sensor signal gain system, characterized in that, include: A gain module, which is used to gain the input signal and output a gain signal; A feedback acquisition module is provided after the gain module, and the feedback acquisition module is used to feed back the gain signal to the main control module; A bias voltage zero-point adjustment module is provided, which is located between the gain module and the main control module. The bias voltage zero-point adjustment module is used to compensate and adjust the bias voltage of the gain module. The main control module is used to acquire the feedback signal from the feedback acquisition module and control the bias voltage zero-point adjustment module to perform compensation adjustment.

2. The adjustable sensor signal gain system according to claim 1, characterized in that, A signal enhancement module is provided between the gain module and the feedback acquisition module. The signal enhancement module is used to filter, reduce noise, and buffer the gain signal output by the gain module, and output an enhanced signal.

3. The adjustable sensor signal gain system according to claim 1, characterized in that, It also includes a gain switching module, which includes multiple gain units. Each gain unit can be selectively connected to the gain module to adjust the gain ratio. The gain units correspond to different gain ratios. The main control module selects the gain unit connected to the gain module to select the gain ratio.

4. The adjustable sensor signal gain system according to claim 3, characterized in that, The gain switching module includes a microcontroller that is communicatively connected to the main control module. Each gain unit is a resistor with a different resistance value, and each gain unit is connected to a control pin of the microcontroller.

5. The adjustable sensor signal gain system according to claim 3, characterized in that, The main control module is connected to a control module, which is used to control the bias voltage zero-point adjustment module to perform zero-point adjustment and select the gain unit.

6. The adjustable sensor signal gain system according to claim 5, characterized in that, The control module includes a remote control unit, which is used to remotely control the bias voltage zero-point adjustment module to perform zero-point adjustment.

7. The adjustable sensor signal gain system according to claim 5, characterized in that, The control module includes a local control unit, which is used to manually control the bias voltage zero-point adjustment module to perform zero-point adjustment or select the gain unit.

8. The adjustable sensor signal gain system according to claim 7, characterized in that, The local control unit includes several buttons.

9. The adjustable sensor signal gain system according to claim 5, characterized in that, The main control module is connected to a status display module, which is used to display the status of the control module.

10. A sensor, characterized in that, The adjustable sensor signal gain system according to any one of claims 1-9.

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