Vibrating table driven sinusoidal signal generator device

Abstract

The utility model provides a sinusoidal signal generator for driving a vibrating table, which comprises a key input module, an RS485 bus input module and a 4-20mA input module, and further comprises an MCU (Microprogrammed Control Unit) singlechip module of which the input end is respectively connected with the output end of the key input module, the output end of the RS485 bus input module and the output end of the 4-20mA input module; the input end of the DDS digital frequency synthesis module is connected with the output end of the MCU single-chip microcomputer module, and the output end of the DDS digital frequency synthesis module is connected with the amplitude adjustment module and used for outputting sine wave signals; the input end of the DAC digital-to-analog conversion module is connected with the output end of the MCU single chip microcomputer module, the output end of the DAC digital-to-analog conversion module is connected with the reference input end of the DDS digital frequency synthesis module, and the DAC digital-to-analog conversion module is used for providing reference voltage for the DDS digital frequency synthesis module The input end of the amplitude adjusting module is connected with the output end of the DDS digital frequency synthesis module, and the output end of the amplitude adjusting module is connected to a load and used for adjusting the amplitude and polarity of the sine wave signal. According to the utility model, vibration signals are accurately adjusted through multiple input modes, and the precision and stability of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sinusoidal signal generators, in particular to a vibration table driven sinusoidal signal generator device. Background Art

[0002] Vibration testing plays a crucial role in verifying the performance and reliability of industrial products. Sinusoidal vibration testing, in particular, is widely used in electronic equipment, mechanical components, aerospace components, and other fields because it can accurately simulate vibration environments at different frequencies. Existing electromagnetic vibration tables, based on the principle of electromagnetic induction, adjust the frequency and amplitude of vibration by controlling the coil current. However, these types of vibration tables have several limitations in practical applications. For example, existing devices typically use local interfaces for parameter settings, lacking compatibility with industrial control devices such as PLCs. In particular, they lack support for 4-20mA analog inputs and RS485 bus communication, making remote control and industrial automation integration difficult.

[0003] Furthermore, existing vibration tables have limited amplitude and frequency adjustment accuracy, making it difficult to meet the precise control requirements for multiple frequency points under complex testing conditions, resulting in inconsistent vibration response. Furthermore, some devices lack real-time detection and closed-loop control mechanisms, preventing effective feedback adjustment of the output vibration signal. This can easily lead to deviations between the output signal and the setpoint, compromising the stability and repeatability of test results. Therefore, improving the interface compatibility, precision adjustment capabilities, and feedback control performance of vibration tables has become a pressing technical challenge. Utility Model Content

[0004] In view of this, the present invention is dedicated to providing a vibration table driven sinusoidal signal generator device for solving the above problems.

[0005] The utility model provides a vibration table driven sinusoidal signal generator device, including a key input module, an RS485 bus input module and a 4-20mA input module, and the device also includes:

[0006] The MCU single chip computer module has an input end connected to the output end of the key input module, the output end of the RS485 bus input module and the output end of the 4-20mA input module respectively;

[0007] The DDS digital frequency synthesis module has an input end connected to the output end of the MCU single chip module.

[0008] The output end is connected to the amplitude adjustment module and is used to output a sine wave signal;

[0009] A DAC digital-to-analog conversion module, whose input end is connected to the output end of the MCU module, and whose output end is connected to the reference input end of the DDS digital frequency synthesis module, is used to provide a reference voltage to the DDS digital frequency synthesis module;

[0010] The amplitude adjustment module has an input end connected to the output end of the DDS digital frequency synthesis module and an output end connected to a load, and is used to adjust the amplitude and polarity of the sine wave signal.

[0011] Optionally, the device further comprises:

[0012] an amplitude detection module, the input end of which is connected to the output end of the amplitude adjustment module, for detecting the amplitude of the output signal and outputting a DC voltage signal corresponding to the amplitude;

[0013] The ADC analog-to-digital conversion module has an input end connected to the output end of the amplitude detection module and an output end connected to the input end of the MCU single-chip computer module, and is used to convert the DC voltage signal into a digital signal and send it to the MCU single-chip computer module.

[0014] Optionally, the device further comprises:

[0015] The alarm module is connected to the MCU single chip computer module and is used to send out sound and light alarm signals when the system parameters are abnormal.

[0016] Optionally, the RS485 bus input module includes:

[0017] The SP3485 transceiver includes an RO pin, a DI pin, a RE pin, and a DE pin; the RO pin is connected to the receive pin of the MCU microcontroller module; the DI pin is connected to the transmit pin of the MCU microcontroller module; the DE pin and the RE pin are connected to each other and to the MCU microcontroller module;

[0018] The JP3 interface is used to receive the input signal of the RS485 bus and transmit the input signal of the RS485 bus to the SP3485 transceiver.

[0019] Optionally, the 4-20mA input module includes:

[0020] JP4 and JP5 interfaces are used to receive 4-20mA input signals;

[0021] A first conversion resistor is connected to the JP4 interface and is used to convert the 4-20mA input signal received by the JP4 interface into a voltage signal;

[0022] A second conversion resistor is connected to the JP5 interface and is used to convert the 4-20mA input signal received by the JP5 interface into a voltage signal;

[0023] A first operational amplifier GS8552, whose input end is connected to the first conversion resistor and whose output end is connected to the AINP_A pin of the ADS7853 chip;

[0024] A second operational amplifier GS8552, having an input end connected to the second conversion resistor and an output end connected to the AINP_B pin of the ADS7853 chip;

[0025] The ADS7853 chip is connected to the MCU microcontroller module through the SDO_A pin, the SCLK pin, the CS pin and the SDI pin.

[0026] Optionally, the DDS digital frequency synthesis module includes an AD9834 chip, and is connected to the MCU single-chip computer module through the FSYNC pin, SCLK pin and SDATA pin of the AD9834 chip.

[0027] Optionally, the DAC digital-to-analog conversion module includes a DAC8571 chip, the SDA pin and SCL pin of the DAC8571 chip are connected to the MCU microcontroller module, and the VSENSE pin and VOUT pin of the DAC8571 chip are both connected to the FS_ADJUST pin of the AD9834 chip.

[0028] Optionally, the amplitude adjustment module includes an operational amplifier GS8551, a first operational amplifier NE5532 and a second operational amplifier NE5532; the positive input terminal of the operational amplifier GS8551 is connected to the IOUT pin of the AD9834 chip, and the output terminal of the operational amplifier GS8551 is connected to the positive input terminal of the first operational amplifier NE5532; the positive input terminal of the second operational amplifier NE5532 is connected to the IOUT pin of the AD9834 chip through a selection switch.

[0029] Optionally, the device further comprises:

[0030] The power module receives external power at its input and is connected to each module at its output, and is used to convert the external power into the voltage required by each module and output it to the corresponding module.

[0031] Optionally, the alarm module includes LED1, LED2, LED3 and a buzzer LS1, the LED1 is connected to the MCU microcontroller module through a resistor R2, the LED2 is connected to the MCU microcontroller module through a resistor R4, and the LED3 is connected to the MCU microcontroller module through a resistor R6; the buzzer LS1 is connected to the MCU microcontroller module through a transistor Q1 and a resistor R8 connected in series in sequence.

[0032] The present invention provides a vibration table-driven sinusoidal signal generator device. By employing the collaborative work of an MCU single-chip computer module, a DDS digital frequency synthesis module, a DAC digital-to-analog conversion module, and an amplitude adjustment module, it is possible to achieve precise control of the sinusoidal wave signal output by the vibration table. The present invention can adjust the frequency, amplitude, and phase of the sinusoidal wave according to different test requirements, thereby outputting a high-precision, stable vibration signal, effectively improving the test accuracy and response continuity of the vibration table. Furthermore, the MCU single-chip computer module has multiple input interfaces, including key input, RS485 bus input, and 4-20mA input, making it compatible with a variety of industrial control equipment, enabling flexible parameter settings and remote control, and improving the system's compatibility and automation level.

[0033] Furthermore, the present invention has stronger functional expansion capabilities. The technical solution of the present invention adopts an amplitude detection module and an ADC analog-to-digital conversion module to realize real-time detection and feedback closed-loop control of the output vibration signal, making the amplitude of the output signal more stable and accurate, improving the reliability of the system and the repeatability of the test results. The RS485 bus input module is connected to the MCU through the SP3485 transceiver, which not only supports long-distance data communication, but also has electrical isolation and anti-interference capabilities, enhancing the communication stability and anti-interference performance of the system. In addition, the alarm module can provide sound and light warning functions when the system parameters are abnormal through the combined action of the LED indicator light, buzzer and Q1 transistor, further improving the safety and fault response capabilities of the system.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The following is a structural block diagram of a vibration table driven sinusoidal signal generator device according to an embodiment of the present invention;

[0036] Figure 2 The following is a structural block diagram of a vibration table driven sinusoidal signal generator device according to another embodiment of the present invention;

[0037] Figure 3 The following is a structural block diagram of a vibration table driven sinusoidal signal generator device under pure resistive load according to an embodiment of the present invention;

[0038] Figure 4 Shown is a circuit diagram of an RS485 bus input module 102 according to one embodiment of the present utility model;

[0039] Figure 5 FIG2 shows a circuit diagram of a 4-20mA input module 103 according to an embodiment of the present invention;

[0040] Figure 6 FIG2 shows a circuit diagram of a DDS digital frequency synthesis module 105 according to an embodiment of the present invention;

[0041] Figure 7 FIG2 shows a circuit diagram of a DAC digital-to-analog conversion module 106 according to an embodiment of the present invention;

[0042] Figure 8 FIG2 shows a circuit diagram of the amplitude adjustment module 107 according to an embodiment of the present invention;

[0043] Figure 9 A circuit diagram of a power supply module according to an embodiment of the present invention is shown;

[0044] Figure 10 The figure shows a circuit diagram of an alarm module according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] In this utility model, the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to the process, method, product, or apparatus.

[0047] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] Figure 1 FIG1 shows a structural block diagram of a vibration table driven sinusoidal signal generator device according to an embodiment of the present invention. Figure 1 As shown, the device includes:

[0049] The input end of the MCU single chip computer module 104 is respectively connected to the output end of the key input module 101 , the output end of the RS485 bus input module 102 and the output end of the 4-20mA input module 103 .

[0050] The MCU module 104 serves as the core control unit of the entire system, receiving input signals from the key input module 101, the RS485 bus input module 102, and the 4-20mA input module 103, processing the input data, and outputting control signals. Based on the set frequency, amplitude, and phase parameters, this module sends a frequency control word to the DDS digital frequency synthesis module 105 and an amplitude control word to the DAC digital-to-analog conversion module 106, precisely controlling the output of the vibration signal. This configuration enables core control of the system, supports multiple input methods, is flexible and compatible with industrial control equipment, and ensures high accuracy, stability, and controllability of the vibration table's output signal through real-time data processing and adjustment.

[0051] The DDS digital frequency synthesis module 105 has an input end connected to the output end of the MCU module 104 and an output end connected to the amplitude adjustment module 107 for outputting a sine wave signal.

[0052] The DDS (Direct Digital Synthesis) digital frequency synthesis module receives the output of the MCU module 104 and, according to the MCU's instructions, synthesizes a sine wave signal of a specific frequency and outputs it to the amplitude adjustment module 107. The output frequency and phase of the DDS digital frequency synthesis module 105 can be adjusted in real time by the MCU, allowing for flexible generation of sine wave signals of varying frequencies. This setup enables flexible and accurate digital generation of sine waves of varying frequencies, ensuring a stable and adjustable frequency output signal to meet the frequency requirements of various vibration tests.

[0053] The DAC digital-to-analog conversion module 106 has an input end connected to the output end of the MCU module 104 and an output end connected to the reference input end of the DDS digital frequency synthesis module 105 , for providing a reference voltage to the DDS digital frequency synthesis module 105 .

[0054] The DAC module 106 converts the digital amplitude control signal output by the MCU into an analog voltage signal, which serves as the reference voltage for the DDS module. By adjusting this reference voltage, the amplitude of the DDS output signal can be varied, enabling precise control of the vibration table's output amplitude. This allows the system to smoothly and linearly adjust the amplitude, ensuring stable output signal amplitude and improving the vibration table's output quality and adjustment accuracy.

[0055] The amplitude adjustment module 107 has an input end connected to the output end of the DDS digital frequency synthesis module 105 and an output end connected to the load 200, and is used to adjust the amplitude and polarity of the sine wave signal.

[0056] Amplitude adjustment module 107 receives the sine wave signal from DDS digital frequency synthesis module 105, further optimizes and adjusts the signal's amplitude and polarity, and then outputs it to load 200 (vibration table) to meet the requirements of various vibration tests. This design effectively improves the linearity and stability of the signal while flexibly adjusting the vibration signal according to different test requirements, ensuring that load 200 receives a high-quality, accurate vibration drive signal.

[0057] Each module is tightly connected via standardized interfaces, forming a highly integrated system. The MCU serves as the core control unit, coordinating the operations of each module. The DDS module generates high-precision frequency signals, the DAC module provides a stable reference voltage, and the amplitude adjustment module 107 further optimizes the output signal. This system architecture not only precisely controls the frequency, amplitude, and phase of the vibration signal, enabling high-precision vibration testing, but also offers a high degree of flexibility, compatibility, and scalability, making it suitable for a variety of vibration testing scenarios. Real-time closed-loop control ensures the stability of the output signal and the reliability of the test results.

[0058] According to the above embodiment, the present invention can achieve precise control of the sinusoidal wave signal output by the vibration table by adopting the coordinated work of the MCU single-chip computer module 104, the DDS digital frequency synthesis module 105, the DAC digital-to-analog conversion module 106 and the amplitude adjustment module 107. The device of the present invention can adjust the frequency, amplitude and phase of the sine wave according to different test requirements, thereby outputting a high-precision, stable vibration signal, effectively improving the test accuracy and response continuity of the vibration table. In addition, the MCU single-chip computer module 104 has multiple input interfaces, including key input, RS485 bus input and 4-20mA input, which is compatible with a variety of industrial control equipment, realizes flexible parameter setting and remote control, and improves the compatibility and automation level of the system.

[0059] Figure 2 FIG1 shows a structural block diagram of a vibration table driven sinusoidal signal generator device according to another embodiment of the present invention. Figure 2 As shown, the vibration table driving sine signal generator device also includes:

[0060] The amplitude detection module 108 has an input end connected to the output end of the amplitude adjustment module 107 and is used to detect the amplitude of the output signal and output a DC voltage signal corresponding to the amplitude.

[0061] Amplitude detection module 108 detects the amplitude of the sine wave signal output by amplitude adjustment module 107 in real time, converts it into a DC voltage signal corresponding to the amplitude, and outputs it to ADC module 109. By converting the output signal amplitude into a DC voltage, this module can provide real-time feedback on the actual output of the vibration signal, providing the system with accurate amplitude monitoring, ensuring that the output signal meets the set parameters, and improving the accuracy of signal control and system reliability.

[0062] The ADC analog-to-digital conversion module 109 has an input end connected to the output end of the amplitude detection module 108 and an output end connected to the input end of the MCU microcontroller module 104 , and is used to convert the DC voltage signal into a digital signal and send it to the MCU microcontroller module 104 .

[0063] The ADC module 109 converts the DC voltage signal output by the amplitude detection module 108 into a digital signal and sends this digital signal to the MCU module 104 for analysis and adjustment. By converting the analog voltage signal into a digital signal, the ADC module provides the MCU with processable feedback data, implementing closed-loop control of the system and facilitating real-time adjustment of the output signal amplitude, ensuring the stability and accuracy of the vibration table's output.

[0064] When the load 200 is not purely resistive, its impedance will change with frequency, making it difficult for the amplitude adjustment under open-loop control to meet the accuracy requirements. Therefore, it is necessary to adopt a closed-loop control method to accurately adjust the amplitude of the sine wave. The utility model monitors the amplitude of the output signal by adding an additional amplitude detection circuit, converts the detected DC voltage signal into a digital signal through the ADC analog-to-digital conversion module 109, and transmits it to the MCU single-chip computer module 104. The MCU compares it with the set voltage and uses algorithms such as PID control or AGC gain control to adjust the output voltage of the DAC digital-to-analog conversion module 106, thereby accurately changing the output signal amplitude of the DDS module and ensuring the amplitude control accuracy of the system.

[0065] In some embodiments, the vibration table driving sinusoidal signal generator device further comprises:

[0066] The alarm module is connected to the MCU module 104 and is used to send out sound and light alarm signals when the system parameters are abnormal.

[0067] When the system detects an output signal outside a preset range or an abnormality, the alarm module receives a control signal from the MCU and issues an audible and visual alarm via an LED and buzzer, prompting the user to promptly check the system. This prompt of audible and visual alerts when system parameters are abnormal enhances system safety and fault response capabilities, reduces potential damage to test equipment or samples, and improves system reliability and user experience.

[0068] According to the above embodiment, the close connection between the amplitude detection module 108, the ADC module 109, and the MCU module of the present invention forms a closed-loop feedback control system that can monitor, convert, and adjust the amplitude of the output signal in real time. Furthermore, the combination of the alarm module and the MCU provides the system with instant feedback and early warning functions for abnormal conditions. This system structure not only improves the output accuracy and stability of the vibration table, but also enables timely response to abnormalities, ensuring the safety and continuity of the testing process.

[0069] Figure 3 The figure shows a structural block diagram of a vibration table driven sinusoidal signal generator device under pure resistive load according to an embodiment of the present invention. Figure 4 FIG. 1 shows a circuit diagram of an RS485 bus input module 102 according to an embodiment of the present invention. Figure 3 and Figure 4 As shown, the RS485 bus input module 102 includes:

[0070] The SP3485 transceiver includes an RO pin, a DI pin, a RE pin, and a DE pin; the RO pin is connected to the receive pin of the MCU microcontroller module 104; the DI pin is connected to the transmit pin of the MCU microcontroller module 104; the DE pin and the RE pin are connected to each other and to the MCU microcontroller module 104.

[0071] The RO (Receive Output) pin is connected to the receive pin of the MCU microcontroller module 104 and is used to convert the RS485 signal received by the SP3485 transceiver into a TTL-level signal and pass it to the MCU for data parsing and processing. The DI (Driver Input) pin is connected to the transmit pin of the MCU microcontroller module 104 and is used to input the TTL-level data sent by the MCU into the SP3485 transceiver. The SP3485 converts the data into an RS485 signal and transmits it to an external device via the bus. The RE (Receiver Enable) pin and the DE (Driver Enable) pin are interconnected and connected to the MCU microcontroller module 104 to switch the transmit and receive states. When the RE and DE pins are controlled high by the MCU, the SP3485 enters transmit mode and sends the MCU's data to the RS485 bus. When the RE and DE pins are low, the SP3485 enters receive mode, receives data from the RS485 bus, and passes it to the MCU.

[0072] The SP3485 transceiver is responsible for bidirectional data transmission between the RS485 bus and the MCU. It receives RS485 signals from the JP3 connector and converts them into TTL signals for processing by the MCU. It also converts TTL signals from the MCU into RS485 signals and transmits them back to the bus. The SP3485 transceiver supports differential signal transmission on the RS485 bus, offering strong anti-interference capabilities and long transmission distances, ensuring reliable data transmission in complex industrial environments. Furthermore, by controlling the RE and DE pins, full-duplex or half-duplex communication can be achieved, enhancing data transmission flexibility and efficiency.

[0073] In the present embodiment, adopt SP3485 transceiver, SP3485 transceiver is a kind of of RS485 transceiver, is used to realize the physical layer function of RS485 communication standard.SP3485 transceiver supports half-duplex and full-duplex communication, and provides multi-point communication capability, allows a plurality of equipment to communicate by same bus.In some feasible other embodiments, also can adopt the RS485 transceiver work of other models, at this utility model no longer too many repeating words.

[0074] JP3 interface is used to receive input signals from the RS485 bus and transmit the input signals from the RS485 bus to the SP3485 transceiver.

[0075] The JP3 interface connects to the RS485 bus input and transmits the received RS485 bus input signal to the input of the SP3485 transceiver. Serving as the connection point between the RS485 bus and the internal circuitry, the JP3 interface receives signals transmitted by the external RS485 bus and transmits them to the SP3485 transceiver for processing. The JP3 interface provides a standardized connection between external devices and the RS485 bus input module 102, ensuring stable and reliable signal transmission. It also supports hot-swappable operation, enhancing system flexibility and ease of use.

[0076] Figure 5 FIG1 shows a circuit diagram of a 4-20mA input module 103 according to an embodiment of the present invention. Figure 3 and Figure 5 , the 4-20mA input module 103 includes:

[0077] JP4 and JP5 are used to receive 4-20mA input signals.

[0078] The JP4 and JP5 connectors receive 4-20mA current signals from external devices (such as sensors or PLCs) and convert them into voltage signals through the connected conversion resistors for subsequent circuit processing. The JP4 and JP5 connectors provide standardized and stable access points for 4-20mA signals, ensuring interference-free transmission to subsequent processing circuits. This supports a wide range of industrial applications and enables efficient data acquisition.

[0079] The first conversion resistor is connected to the JP4 interface and is used to convert the 4-20mA input signal received by the JP4 interface into a voltage signal.

[0080] The second conversion resistor is connected to the JP5 interface and is used to convert the 4-20mA input signal received by the JP5 interface into a voltage signal.

[0081] The first conversion resistor is connected to the JP4 connector, and the second conversion resistor is connected to the JP5 connector. They are used to convert the 4-20mA input current signal into a proportional voltage signal. These two conversion resistors convert the 4-20mA current signal received by the JP4 and JP5 connectors, respectively, into a proportional voltage signal, providing the appropriate voltage value for subsequent signal processing. Converting the current signal to a voltage signal using the conversion resistors simplifies subsequent circuit design, as the voltage signal is easier to process and analyze, while also ensuring linear signal conversion and improving measurement accuracy.

[0082] The first operational amplifier GS8552 has an input end connected to the first conversion resistor, and an output end connected to the AINP_A pin of the ADS7853 chip.

[0083] The second operational amplifier GS8552 has an input end connected to the second conversion resistor, and an output end connected to the AINP_B pin of the ADS7853 chip.

[0084] The two GS8552 operational amplifiers (op amps) act as voltage followers, ensuring that the voltage signals obtained from the first conversion resistor (R39) and the second conversion resistor (R44) are stably transmitted to the AINP_A and AINP_B pins of the ADS7853 chip. They receive the potential across the precision resistors through their input terminals and directly convert it into a voltage output suitable for subsequent analog-to-digital conversion, with an amplification factor of 1. The primary function of the GS8552 op amps is to ensure accurate and stable signal transmission, avoid signal attenuation, and ensure that the input voltage signal is accurately fed into the ADC for analog-to-digital conversion, thereby improving system reliability and measurement accuracy.

[0085] The ADS7853 chip is connected to the MCU module 104 via the SDO_A pin, the SCLK pin, the CS pin, and the SDI pin.

[0086] The ADS7853 chip, acting as an analog-to-digital converter, converts the analog voltage signals output by the first and second operational amplifiers into digital signals. This digital signal is then transmitted to the MCU module 104 via the SPI interface (SDO_A, SCLK, CS, and SDI) for further processing. The ADS7853 chip provides precise conversion capabilities for high-precision analog-to-digital conversion, converting analog signals into digital signals and providing high-resolution output. Its connection to the MCU module 104 via the SPI interface ensures high-speed and stable data transmission, further improving the system's response speed and accuracy.

[0087] In this embodiment, the ADS7853 chip is a type of ADC (analog-to-digital converter). It is used to convert analog signals into digital signals. Specifically, the ADS7853 is a high-precision, low-power 12-bit analog-to-digital converter (ADC) that supports an SPI interface for data transmission with a microcontroller (MCU). In some feasible alternative embodiments, the ADC may also operate using other chip models, which will not be further described in this utility model.

[0088] Figure 6 FIG1 shows a circuit diagram of a DDS digital frequency synthesis module 105 according to an embodiment of the present invention. Figure 3 and Figure 6The DDS digital frequency synthesis module 105 includes an AD9834 chip, and is connected to the MCU single chip module 104 through the FSYNC pin, SCLK pin, SDATA pin and MCLK pin of the AD9834 chip.

[0089] The DDS digital frequency synthesis module 105 uses control signals (such as frequency and phase) sent by the MCU to generate the required sinusoidal output signal through the AD9834 chip. The AD9834 chip can synthesize sinusoidal signals of different frequencies based on the input digital frequency and phase values. The MCU transmits control data via the data line (SDATA), SCLK provides the clock signal, and FSYNC is used to synchronize data transmission. In addition, by connecting the MCLK pin of the AD9834 chip to the MCU microcontroller module, the digital clock input provides a stable clock source, thereby ensuring that the frequency accuracy and phase noise of the output signal are effectively controlled. This connection method can improve the system's frequency stability, reduce signal interference, and ensure high-precision and low-noise sinusoidal output, meeting the requirements of precision vibration testing.

[0090] The AD9834 chip's digital synthesis technology allows for precise control of the output signal's frequency and phase, meeting the precision requirements of diverse applications. This connection to the MCU provides more flexible control, enabling high-precision frequency adjustment and making it suitable for applications requiring precise vibration control.

[0091] In this embodiment, the DDS digital frequency synthesizer uses the AD9834 chip. Through digital signal synthesis technology, the AD9834 chip can generate an accurate output signal based on a given frequency and phase control word. It digitally adjusts the frequency, has high frequency resolution and stability, and can adjust the frequency, phase, and amplitude through external control. In other feasible embodiments, the DDS digital frequency synthesizer may also use other chips, which will not be further described in this utility model.

[0092] Figure 7 FIG. 1 shows a circuit diagram of a DAC digital-to-analog conversion module 106 according to an embodiment of the present invention. Figure 3 and Figure 7 The DAC digital-to-analog conversion module 106 includes a DAC8571 chip, the SDA pin and SCL pin of the DAC8571 chip are connected to the MCU microcontroller module 104, and the VSENSE pin and VOUT pin of the DAC8571 chip are both connected to the FS_ADJUST pin of the AD9834 chip.

[0093] The DAC8571 chip's SDA and SCL pins are connected to the MCU module 104, providing digital control signals. Its VSENSE and VOUT pins are connected to the FS_ADJUST pin of the AD9834 chip, providing a reference voltage for the AD9834. The DAC digital-to-analog conversion module 106 converts the digital control signal from the MCU module 104 into an analog voltage signal, which serves as the reference voltage input for the AD9834 chip. By adjusting the reference voltage output by the DAC8571 chip, the amplitude of the AD9834 chip's output signal can be adjusted, thereby precisely controlling the amplitude and output quality of the vibration signal.

[0094] In this embodiment, the DAC uses a DAC8571 chip to provide a stable analog output signal, precisely adjust the AD9834's output amplitude, and ensure the stability of the vibration signal. The DAC8571 chip offers high-precision digital-to-analog conversion and low power consumption, making it suitable for applications requiring long-term stable operation. In other feasible embodiments, other chips may be used for the DAC, and this invention will not be further elaborated upon here.

[0095] Figure 8 FIG1 shows a circuit diagram of the amplitude adjustment module 107 according to an embodiment of the present invention. Figure 3 and Figure 8 The amplitude adjustment module 107 includes an operational amplifier GS8551, a first operational amplifier NE5532, and a second operational amplifier NE5532; the positive input terminal of the operational amplifier GS8551 is connected to the IOUT pin of the AD9834 chip, and the output terminal of the operational amplifier GS8551 is connected to the positive input terminal of the first operational amplifier NE5532; the positive input terminal of the second operational amplifier NE5532 is connected to the IOUT pin of the AD9834 chip through a selection switch.

[0096] Amplitude adjustment module 107 receives the sine wave signal from the AD9834 chip and performs preliminary amplification processing on the signal using the GS8551 operational amplifier. The signal's amplitude and polarity are then further adjusted using the NE5532 operational amplifier. A selector switch allows for switching between different amplitude adjustment paths, allowing for precise control of the output signal's amplitude and waveform. Through the combination of operational amplifiers, amplitude adjustment module 107 can precisely control the signal's amplitude and polarity, ensuring that the output signal is tailored to the needs of a specific application. The selection and configuration of the operational amplifiers ensures a stable and continuous signal output that is less susceptible to external interference, thereby ensuring the accuracy of the vibration signal.

[0097] In some embodiments, the vibration table driven sinusoidal signal generator device of the present invention further includes a power supply module. Figure 9FIG. 1 shows a circuit diagram of a power supply module according to an embodiment of the present invention. Figure 9 As shown, the input end of the power module receives external power, and the output end is connected to each module, which is used to convert the external power into the voltage required by each module and output it to the corresponding module.

[0098] The power module's input receives external power, typically +15V and -15V. These voltages are converted by voltage regulator chips to generate different output voltages, such as +12V, -12V, +5V, and +3.3V, which are used to power various modules in the system. Specifically, the external power (+15V and -15V) is connected to the power module's input. The power module uses different types of voltage regulator chips for voltage conversion. The +15V and -15V voltage regulator chips convert them to +12V and -12V to power operational amplifiers and other modules requiring bipolar power. The +15V voltage is converted to +5V and +3.3V by step-down regulator chips to power various integrated circuits (such as the MCU module 104, the DDS digital frequency synthesis module 105, and the DAC digital-to-analog conversion module 106). The regulated +12V, -12V, +5V, and +3.3V voltages are delivered to the power inputs of each module through the power module's output.

[0099] The power module converts external power into multiple stable voltages through a voltage regulator chip, ensuring stable operation of each module and avoiding instability caused by voltage fluctuations. Furthermore, the power module provides bipolar and unipolar power to different modules, improving system compatibility and flexibility while also rationally allocating power to optimize energy efficiency and reliability. Whether during commissioning or in actual use, the power module adapts to various scenarios, ensuring system stability and safety, which is particularly crucial for the reliability of precision control modules.

[0100] Figure 10 FIG. 1 shows a circuit diagram of an alarm module according to an embodiment of the present invention. Figure 10 As shown, the alarm module includes LED1, LED2, LED3 and buzzer LS1. LED1 is connected to the MCU microcontroller module 104 through resistor R2, LED2 is connected to the MCU microcontroller module 104 through resistor R4, and LED3 is connected to the MCU microcontroller module 104 through resistor R6; the buzzer LS1 is connected to the MCU microcontroller module 104 through a transistor Q1 and a resistor R8 connected in series in sequence.

[0101] LED1, LED2, and LED3 are connected to the MCU module 104 via different resistors, each displaying a different alarm status using a different color. The MCU controls the current flowing through these LEDs to achieve different display effects. In some embodiments, LED1 and LED2 are red, and LED3 is blue, indicating different levels of alarm or status information. In other feasible embodiments, LED1, LED2, and LED3 can also be set to other different colors, which will not be elaborated on here.

[0102] The buzzer works in conjunction with transistor Q1. When the MCU detects an anomaly (such as a system failure or exceeding a parameter range), it turns on Q1, driving the buzzer to sound an alarm, alerting the user to the problem.

[0103] The alarm module combines LED indicators and a buzzer to provide both visual and audible alerts, helping operators quickly identify system anomalies and take necessary action, thereby reducing operational errors. Different colored LEDs intuitively reflect the alarm level, while the buzzer provides audible prompts, enhancing the effectiveness of the alerts. This design improves system reliability and safety, particularly in equipment requiring high stability, effectively enhancing emergency response capabilities. Furthermore, these alerts allow users to quickly diagnose problems, simplify troubleshooting, and improve maintenance efficiency and operational convenience.

[0104] According to the above embodiment, the technical solution of the utility model adopts the amplitude detection module 108 and the ADC analog-to-digital conversion module 109 to realize real-time detection and feedback closed-loop control of the output vibration signal, making the amplitude of the output signal more stable and accurate, improving the reliability of the system and the repeatability of the test results. The RS485 bus input module 102 is connected to the MCU via the SP3485 transceiver, which not only supports long-distance data communication, but also has electrical isolation and anti-interference capabilities, thereby enhancing the communication stability and anti-interference performance of the system. In addition, the alarm module can provide an audible and visual warning function when the system parameters are abnormal through the combined action of the LED indicator light, the buzzer and the Q1 transistor, further improving the safety and fault response capability of the system.

[0105] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A vibration table driven sine signal generator device, comprising a key input module, an RS485 bus input module and a 4-20mA input module, characterized in that: The device further comprises: The MCU single chip computer module has an input end connected to the output end of the key input module, the output end of the RS485 bus input module and the output end of the 4-20mA input module respectively; A DDS digital frequency synthesis module, whose input end is connected to the output end of the MCU single chip module, and whose output end is connected to the amplitude adjustment module, is used to output a sine wave signal; A DAC digital-to-analog conversion module, whose input end is connected to the output end of the MCU module, and whose output end is connected to the reference input end of the DDS digital frequency synthesis module, is used to provide a reference voltage to the DDS digital frequency synthesis module; The amplitude adjustment module has an input end connected to the output end of the DDS digital frequency synthesis module and an output end connected to a load, and is used to adjust the amplitude and polarity of the sine wave signal.

2. The vibration table driven sinusoidal signal generator device according to claim 1, characterized in that: The device further comprises: an amplitude detection module, the input end of which is connected to the output end of the amplitude adjustment module, for detecting the amplitude of the output signal and outputting a DC voltage signal corresponding to the amplitude; The ADC analog-to-digital conversion module has an input end connected to the output end of the amplitude detection module and an output end connected to the input end of the MCU single-chip computer module, and is used to convert the DC voltage signal into a digital signal and send it to the MCU single-chip computer module.

3. The vibration table driven sinusoidal signal generator device according to claim 1, characterized in that: The device further comprises: The alarm module is connected to the MCU single chip computer module and is used to send out sound and light alarm signals when the system parameters are abnormal.

4. The vibration table driven sinusoidal signal generator device according to claim 1, characterized in that: The RS485 bus input module includes: The SP3485 transceiver includes an RO pin, a DI pin, a RE pin, and a DE pin; the RO pin is connected to the receive pin of the MCU microcontroller module; the DI pin is connected to the transmit pin of the MCU microcontroller module; the DE pin and the RE pin are connected to each other and to the MCU microcontroller module; The JP3 interface is used to receive the input signal of the RS485 bus and transmit the input signal of the RS485 bus to the SP3485 transceiver.

5. The vibration table driven sinusoidal signal generator device according to claim 1, characterized in that: The 4-20mA input module includes: JP4 and JP5 interfaces are used to receive 4-20mA input signals; A first conversion resistor is connected to the JP4 interface and is used to convert the 4-20mA input signal received by the JP4 interface into a voltage signal; A second conversion resistor is connected to the JP5 interface and is used to convert the 4-20mA input signal received by the JP5 interface into a voltage signal; A first operational amplifier GS8552, whose input end is connected to the first conversion resistor and whose output end is connected to the AINP_A pin of the ADS7853 chip; A second operational amplifier GS8552, having an input end connected to the second conversion resistor and an output end connected to the AINP_B pin of the ADS7853 chip; The ADS7853 chip is connected to the MCU microcontroller module through the SDO_A pin, the SCLK pin, the CS pin and the SDI pin.

6. The vibration table driven sinusoidal signal generator device according to claim 1, characterized in that: The DDS digital frequency synthesis module includes an AD9834 chip and is connected to the MCU single chip module via the FSYNC pin, SCLK pin, SDATA pin and MCLK pin of the AD9834 chip.

7. The vibration table driven sinusoidal signal generator device according to claim 6, characterized in that: The DAC digital-to-analog conversion module includes a DAC8571 chip, the SDA pin and SCL pin of the DAC8571 chip are connected to the MCU single-chip module, and the VSENSE pin and VOUT pin of the DAC8571 chip are both connected to the FS_ADJUST pin of the AD9834 chip.

8. The vibration table driven sinusoidal signal generator device according to claim 6, characterized in that: The amplitude adjustment module includes an operational amplifier GS8551, a first operational amplifier NE5532, and a second operational amplifier NE5532; the positive input end of the operational amplifier GS8551 is connected to the IOUT pin of the AD9834 chip, and the output end of the operational amplifier GS8551 is connected to the positive input end of the first operational amplifier NE5532; the positive input end of the second operational amplifier NE5532 is connected to the IOUT pin of the AD9834 chip through a selection switch.

9. The vibration table driven sinusoidal signal generator device according to claim 3, characterized in that: The device further comprises: The power module receives external power at its input and is connected to each module at its output, and is used to convert the external power into the voltage required by each module and output it to the corresponding module.

10. The vibration table driven sinusoidal signal generator device according to claim 3, characterized in that: The alarm module includes LED1, LED2, LED3 and buzzer LS1. The LED1 is connected to the MCU microcontroller module through resistor R2, the LED2 is connected to the MCU microcontroller module through resistor R4, and the LED3 is connected to the MCU microcontroller module through resistor R6; the buzzer LS1 is connected to the MCU microcontroller module through transistor Q1 and resistor R8 connected in series.

Images