A sine wave signal generator

Abstract

This utility model relates to the technical field of sine wave signal generating devices, specifically a sine wave signal generating device. The utility model includes a signal generator body and a signal generator outer frame. The signal generator outer frame is snap-fitted onto both ends of the signal generator body. Support arms are rotatably mounted on the side walls of both sets of signal generator outer frames. A connecting arm for supporting the bottom of the signal generator body is fixedly connected between the two sets of support arms. A fixing post is fixedly connected to the side wall of the signal generator outer frame, and a connecting cover is fixedly connected to one end of each support arm. The two sets of signal generator outer frames snap-fit ​​onto both ends of the signal generator body, protecting both ends of the signal generator body. The support arms can rotate relative to the signal generator outer frame, and when rotation stops, the connecting cover engages with the fixing post, fixing the angle of the support arms. Therefore, by changing the angle of the support arms, the support angle of the connecting arm on the signal generator body can be adjusted, improving functionality.

Description

Technical Field

[0001] This utility model relates to the field of sine wave signal generating devices, specifically a sine wave signal generating device. Background Technology

[0002] Sine wave signal generators are widely used in electronic circuit design, automatic control systems, and instrument measurement, calibration, and debugging. They belong to the category of digital signal generators. Sine wave signals are a common signal source with the most singular frequency components. Any complex signal (such as a spectral signal) can be decomposed into a superposition of many sinusoidal signals with different frequencies and amplitudes through Fourier transform. Its application fields are very wide.

[0003] Existing sine wave signal generators, such as the pulse signal generator proposed in patent application number "CN202222474892.1", include a pulse signal generator body, a fixing frame, shock-absorbing pads, and other structures. The position of the limiting frame is adjusted by moving a slider in a groove, and the adjusted position is fixed by fastening screws. The pulse signal generator body is then limited and fixed by the combination of the limiting frame and the rubber pad. This prevents the pulse signal generator body from falling off when the device is impacted because the pulse signal generator body and the fixing frame are movably connected, thus avoiding damage and providing all-round protection to ensure the service life of the pulse signal generator body.

[0004] However, existing technologies have shortcomings. The front end of the signal generator cannot be supported and lifted, making it inconvenient to operate. Existing technologies use brackets to support the front end of the signal generator, but the support angle is not adjustable and cannot be adjusted according to actual needs. The functionality needs to be improved. Therefore, a sine wave signal generating device is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a sine wave signal generating device to solve the problems mentioned in the background art.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A sine wave signal generating device includes a signal generator body and a signal generator outer frame. The signal generator outer frame is snapped onto both ends of the signal generator body. Support arms are rotatably mounted on the side walls of the two sets of signal generator outer frames. A connecting arm for supporting the bottom of the signal generator body is fixedly connected between the two sets of support arms.

[0008] A fixed column is fixed to the side wall of the outer frame of the signal generator, and a connecting cover is fixed to one end of the support arm. The inner wall of the connecting cover and the outer wall of the fixed column are engaged to adjust the support angle of the connecting arm.

[0009] Preferably, the side walls of the two sets of fixed columns are provided with annular grooves, and a ring is fixedly connected to the inner wall of the connecting cover. The ring is rotatably installed in the annular groove. The outer walls of the outer frames of the two sets of signal generators are fixedly connected with protective layers, which are located between the support arm and the outer frame of the signal generator.

[0010] Preferably, one end of the side wall of the fixed column is provided with a snap-fit ​​groove, and multiple sets of spring plates are fixedly connected in the snap-fit ​​groove. The multiple sets of spring plates are arranged in a circumferential array, and a toothed ring is fixedly connected to one side of each set of spring plates. A toothed ring is fixedly connected to the inner wall of the connecting cover, and the toothed ring and the toothed ring are snap-fitted together.

[0011] Preferably, the bottom of the signal generator frame is fixedly connected to a recessed end, the lower end of the signal generator body is fixedly connected to a foot, the foot is inserted into the recessed end, and the upper end of the signal generator body abuts against the upper end of the inner wall of the signal generator frame.

[0012] Preferably, a baffle is rotatably installed at the opening of the recessed end, and the baffle abuts against the bottom foot to prevent the bottom foot from disengaging from the recessed end.

[0013] Preferably, both sets of protective layers have grooves at their upper ends, with posts inserted into the grooves, and multiple posts are fixedly connected to an elastic layer at their upper ends, with heat dissipation holes on the elastic layer.

[0014] The beneficial effects of this utility model are:

[0015] This utility model uses two sets of signal generator outer frames to snap onto both ends of the signal generator body, protecting both ends of the signal generator body. After the support arm is manually twisted, the support arm can rotate relative to the signal generator outer frame. When the rotation stops, the connecting cover snaps into the fixing post, so that the angle of the support arm is fixed. Therefore, by changing the angle of the support arm, the support angle of the connecting arm on the signal generator body can be adjusted, thus improving the functionality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall disassembled structure of this utility model;

[0019] Figure 3 yes Figure 1 Enlarged schematic diagram of the structure at point A;

[0020] Figure 4 This is a schematic diagram of the fixed column structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the connecting cover structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the spring plate snap-fit ​​structure of this utility model;

[0023] Figure 7 This is a schematic diagram of a differential pair (transistor) triangular wave to sine wave conversion scheme;

[0024] The attached figures are labeled as follows:

[0025] 1. Signal generator body; 2. Base; 3. Signal generator outer frame; 4. Recessed end; 5. Protective layer; 6. Baffle; 7. Groove; 8. Insert post; 9. Elastic layer; 10. Heat dissipation hole; 11. Fixing post; 12. Annular groove; 13. Snap-fit ​​groove; 14. Spring plate; 15. Toothed ring; 16. Connecting cover; 17. Circular ring; 18. Toothed ring; 19. Support arm; 20. Connecting arm. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] A sine wave signal generator, such as Figures 1-6 As shown, the device includes a signal generator body 1 and a signal generator outer frame 3. The signal generator outer frame 3 is snapped onto both ends of the signal generator body 1. Support arms 19 are rotatably mounted on the side walls of both sets of signal generator outer frames 3. A connecting arm 20 for supporting the bottom of the signal generator body 1 is fixed between the two sets of support arms 19. This sine wave signal generating device is mainly composed of a signal generator body 1 and a signal generator outer frame 3. The two sets of signal generator outer frames 3 are snapped onto both ends of the signal generator body 1 to protect both ends of the signal generator body 1 and prevent the signal generating device from being squeezed and damaged on both sides.

[0028] A fixing post 11 is fixedly connected to the side wall of the outer frame 3 of the signal generator, and a connecting cover 16 is fixedly connected to one end of the support arm 19. The inner wall of the connecting cover 16 and the outer wall of the fixing post 11 are engaged to adjust the support angle of the connecting arm 20.

[0029] After manually twisting the support arm 19, the support arm 19 can rotate relative to the outer frame 3 of the signal generator. When the rotation stops, the connecting cover 16 engages with the fixing post 11, so that the angle of the support arm 19 is fixed. Therefore, by changing the angle of the support arm 19, the support angle of the connecting arm 20 on the signal generator body 1 can be adjusted, thus improving the function.

[0030] The following describes several commonly used methods for generating sinusoidal signals:

[0031] (1) The usual method to generate a sinusoidal signal for an LCR table is to use an MCU or DSP to control a DAC using a lookup table method to generate a phase-controllable sinusoidal signal, which facilitates the extraction of two orthogonal phase digital synchronization signals at 0 degrees and 90 degrees for phase control of the signal chain. This method of generating a sinusoidal signal has high requirements for the MCU (or DSP) and DAC chip, so the cost is high, and it is generally used only in high-end instrument design schemes.

[0032] (2) Another simple and low-cost way to implement a sinusoidal signal in an LCR meter is to use an MCU to output a square wave signal of a specific frequency and then use a filter to adjust the waveform of the square wave signal. Feasible options include multi-stage cascaded switched-capacitor filters or multi-stage cascaded RC filters, both of which can adjust the square wave signal into a sinusoidal signal. However, the biggest drawback of both filtering schemes is that they cannot output high-frequency signals. Furthermore, the amplitude differences between different frequencies are large, resulting in significant differences in signal-to-noise ratio performance, requiring separate adjustments. If a highly integrated multi-stage switched-capacitor filter chip is used, the cost will increase because most of these are imported components.

[0033] (3) Although a sine wave with a good signal-to-noise ratio can be obtained by using a DDS chip and the frequency adjustment is extremely simple, obtaining the 0-degree and 90-degree phase signals that are synchronized with it makes the design implementation complicated and the overall cost is high.

[0034] The core method used in this design is a differential pair (transistor) triangular wave to sine wave conversion scheme. The front-end of this scheme utilizes a high-precision square wave signal output from the MCU (50% duty cycle, frequency stability derived from a quartz crystal oscillator), which is then inverted by a 74HC04 inverter to obtain a target frequency signal with a double-harmonic frequency and opposite phase. The source signal, after passing through a 74HC08 AND gate, maintains the same delay as the inverted signal (still possessing the accurate 50% duty cycle characteristic). See [link to relevant documentation]. Figure 7 .

[0035] At this point, both signals with opposite phases are twice the frequency of the target signal. They are connected to the two clock inputs of a 74HC74 (dual D flip-flops), with the Q-nots of the two D flip-flops connected to their respective trigger inputs (D), achieving a 2-way frequency division. This divided signal is the target frequency signal, and the phase difference between the two signals is exactly 90 degrees. Therefore, synchronous phase signals of 0 degrees and 90 degrees are obtained. Then, the 0-degree phase signal is used to control the positive and negative analog power supplies to periodically charge and discharge a set of (3-4) RC circuits, obtaining several sets of triangular wave signals. By appropriately selecting the RC (resistor and capacitor values), their charging and discharging trajectories are kept essentially linearly increasing and decreasing, and their charging and discharging amplitudes are consistent, thus obtaining a perfect set of triangular wave signals. Differential converters have certain requirements for the signal input amplitude of the triangular wave to sine wave converter; therefore, a differential operational amplifier is inserted to amplify it to the target amplitude before inputting it into the converter. The output of the waveform converter circuit is a perfect sine wave signal. This signal has a high signal-to-noise ratio and low total harmonic distortion, making it very suitable as a signal source for LCR meters. This solution is inexpensive and offers a wide variety of component options.

[0036] like Figures 4-6 As shown, the two sets of fixed columns 11 have annular grooves 12 on their side walls, and a ring 17 is fixedly connected to the inner wall of the connecting cover 16. The ring 17 is rotatably installed in the annular groove 12. The outer walls of the two sets of signal generator outer frames 3 are all fixedly connected with protective layers 5, which are located between the support arm 19 and the signal generator outer frame 3.

[0037] The ring 17 inside the connecting cover 16 is rotatably installed with the annular groove 12 on the side wall of the fixing column 11, so that the connecting cover 16 can be rotatably installed relative to the outer frame 3 of the signal generator. The tilt angle of the support arm 19 changes, the protective layer 5 increases the protection level of the outer frame 3 of the signal generator, and there is a space between the outer frame 3 of the signal generator and the side wall of the signal generator body 1, which facilitates heat dissipation from the side of the signal generator.

[0038] like Figures 4-6 As shown, a snap-fit ​​groove 13 is provided at one end of the side wall of the fixed column 11. Multiple sets of spring plates 14 are fixedly connected in the snap-fit ​​groove 13. The multiple sets of spring plates 14 are arranged in a circumferential array. A toothed ring 15 is fixedly connected to one side of each set of spring plates 14. A toothed ring 18 is fixedly connected to the inner wall of the connecting cover 16. The toothed ring 18 and the toothed ring 15 are snap-fitted together.

[0039] When a force is applied to drive the support arm 19 to rotate, the outer wall of the connecting cover 16 presses against the spring plate 14, increasing the fit between the spring plate 14 and the inner wall of the snap-fit ​​groove 13. The connecting cover 16 rotates relative to the fixed post 11. When the applied force is removed, the spring plate 14 returns to its original shape and moves closer to the inner wall of the connecting cover 16, causing the toothed ring 15 to mesh with the toothed ring 18. Therefore, the connecting cover 16 is snapped into the fixed post 11, and the angle and position of the support arm 19 are fixed. The support angle of the support arm 19 can be freely controlled by this method.

[0040] like Figures 1-3 As shown, a recessed end 4 is fixedly connected to the bottom of the signal generator outer frame 3, and a foot 2 is fixedly connected to the lower end of the signal generator body 1. The foot 2 is inserted into the recessed end 4, and the upper end of the signal generator body 1 abuts against the upper end of the inner wall of the signal generator outer frame 3.

[0041] The bottom feet 2 of the signal generator body 1 are snapped into the recessed end 4, which facilitates the installation of the signal generator body 1 inside the signal generator outer frame 3.

[0042] like Figure 3 As shown, a baffle 6 is rotatably installed at the opening of the recessed end 4. The baffle 6 abuts against the bottom foot 2 to prevent the bottom foot 2 from dislodging from the recessed end 4.

[0043] After the base 2 and the recessed end 4 are inserted, rotate the baffle 6 so that the baffle 6 blocks the opening of the recessed end 4 to prevent the base 2 from detaching from the outer frame 3 of the signal generator.

[0044] like Figures 1-2 As shown, both sets of protective layers 5 have grooves 7 on their upper ends, and inserts 8 are inserted into the grooves 7. Multiple sets of inserts 8 are fixed to the upper ends of an elastic layer 9, and heat dissipation holes 10 are provided on the elastic layer 9.

[0045] The post 8 on the elastic layer 9 is inserted into the groove 7 of the protective layer 5. The elastic layer 9 protects the upper end of the signal generator body 1 to prevent the device from being damaged by pressure. The heat dissipation hole 10 facilitates heat dissipation at the upper end of the signal generator body 1.

[0046] The working principle of the sine wave signal generator provided by this utility model is as follows:

[0047] The two signal generator outer frames 3 are snapped onto both ends of the signal generator body 1 to protect both ends of the signal generator body 1. After the support arm 19 is manually twisted, the support arm 19 can rotate relative to the signal generator outer frame 3. When the rotation stops, the toothed ring 18 on the inner wall of the connecting cover 16 engages with the toothed ring 15 on the spring plate 14, and the angle of the connecting cover 16 is fixed, so the angle of the support arm 19 is fixed. Therefore, by changing the angle of the support arm 19, the support angle of the connecting arm 20 on the signal generator body 1 can be adjusted, thus improving the function.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A sine wave signal generating device comprising a signal generator body (1) and a signal generator outer frame (3), characterized in that, The outer frame (3) of the signal generator is snapped onto both ends of the signal generator body (1). Support arms (19) are rotatably installed on the side walls of both sets of signal generator outer frames (3). A connecting arm (20) for supporting the bottom of the signal generator body (1) is fixed between the two sets of support arms (19). The signal generator outer frame (3) has a fixed column (11) fixed to its side wall, and a connecting cover (16) is fixed to one end of the support arm (19). The inner wall of the connecting cover (16) and the outer wall of the fixed column (11) are engaged to adjust the support angle of the connecting arm (20). The two sets of fixed columns (11) have annular grooves (12) on their side walls. A ring (17) is fixed to the inner wall of the connecting cover (16). The ring (17) is rotatably installed in the annular groove (12). A protective layer (5) is fixed to the outer wall of the two sets of signal generator frames (3). The protective layer (5) is located between the support arm (19) and the signal generator frame (3). The fixed column (11) has a snap-fit ​​groove (13) at one end of its side wall. Multiple sets of spring plates (14) are fixedly connected in the snap-fit ​​groove (13). The multiple sets of spring plates (14) are arranged in a circumferential array. A toothed ring (15) is fixedly connected to one side of each set of spring plates (14). A toothed ring (18) is fixedly connected to the inner wall of the connecting cover (16). The toothed ring (18) and the toothed ring (15) are snap-fitted together.

2. A sine wave signal generating device according to claim 1, characterized in that The bottom of the outer frame (3) of the signal generator is fixedly connected to a recessed end (4), and the lower end of the signal generator body (1) is fixedly connected to a foot (2). The foot (2) is inserted into the recessed end (4), and the upper end of the signal generator body (1) abuts against the upper end of the inner wall of the outer frame (3) of the signal generator.

3. A sine wave signal generating device according to claim 2, characterised in that, A baffle (6) is rotatably installed at the opening of the recessed end (4). The baffle (6) abuts against the foot (2) to prevent the foot (2) from dislodging from the recessed end (4).

4. A sine wave signal generating device according to claim 1, characterized in that Both sets of protective layers (5) have grooves (7) on their upper ends, and inserts (8) are inserted into the grooves (7). Multiple sets of inserts (8) are fixed to the upper ends of an elastic layer (9), and heat dissipation holes (10) are provided on the elastic layer (9).

Images