Optical filter rotation control circuit, PCB and rotation device thereof

Abstract

The utility model relates to the technical field of optical measurement equipment, in particular to an optical filter rotation control circuit, a PCB (Printed Circuit Board) and a rotation device of the PCB. The control circuit comprises a main control unit, a stepping motor driving unit, a rotating speed detection unit and a display screen communication unit. The main control unit is electrically connected with the stepping motor driving unit, the rotating speed detection unit and the display screen communication unit. The stepping motor driving unit adjusts the rotation state of the stepping motor according to the PWM signal of the main control unit; the rotating speed detection unit is used for detecting the rotating speed state of the stepping motor; the display screen communication unit is used for sending a display signal to the display screen. The device has the advantages that an operator can conveniently set a rotation angular velocity parameter of the stepping motor only through the speed regulation device, and obtains a real-time parameter rotation state through the display screen, so that the influence of the rotation of the optical filter on the optical measurement coherence degree can be accurately and quantitatively determined, the operation is simple and convenient, the optical measurement efficiency is improved, and the measurement accuracy is improved. The cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of optical measuring equipment, in particular to a filter rotation control circuit, a PCB board and a rotation device thereof. Background Art

[0002] Currently, in optical instruments and experimental devices, the device that uses laser to penetrate a rotating filter to obtain coherent light includes a rotating device, which includes a bracket with only a motor arranged inside the bracket. The filter is rotated and controlled by the rotation of the motor. However, this method has low accuracy and can only be used qualitatively.

[0003] At present, there are many kinds of known rotation control circuits, which are mostly applicable to the rotation control of TV bases, agricultural power monitoring turntables and lawn lamps. For example, the document with application number "200710075867.3" discloses "a system for remotely controlling the rotation of a TV base", which is mainly used to facilitate users to watch TV at a suitable angle. This rotation is not full-angle, but is adjusted within a certain angle range. Its control circuit mainly includes helping to judge whether the TV base is rotated to the middle position, the maximum rotation angle of the left turn or the maximum rotation angle of the right turn, and performing rotation control within a certain angle range. The precision of the rotation state adjustment is not high. For another example, the document with application number "201820419352.4" discloses "a multi-light constant current heating rotation control circuit for lawn lamps", and its control circuit drives the lamp group to rotate through a motor to improve the ornamental value of multiple groups of lights. The ornamental value itself is subjective and non-quantitative, and rotates at a specified speed by fixing multiple groups of modes. Since it rotates at a specified speed, the precision of the rotation state adjustment is not high, and it is impossible to set parameters and feedback the rotation speed in real time.

[0004] In summary, the above control circuits are not applicable to the rotation requirements of the filter in the above device, nor can they meet the accuracy requirements. This is because the above control circuits have the following problems: 1. The rotation speed cannot be set in real time, resulting in the speed only matching the rated power and fixed frequency of the motor; 2. Due to the lack of speed detection design in the circuit, the adjustment accuracy is not high, and stable rotation control cannot be achieved; 3. The rotation speed cannot be fed back in real time, resulting in the inability to read the speed in real time and iteratively issue speed control instructions.

[0005] How to improve the stable control of the rotation of the filter in the rotating device is an urgent problem to be solved in the technology of improving the reproducibility of experimental results. Summary of the invention

[0006] The utility model provides a filter rotation control circuit to overcome the problems in the prior art of difficulty in stably controlling the rotation of the filter, insufficient adjustment accuracy, and inability to set and feedback the rotation speed in real time.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a filter rotation control circuit, including a main control unit, a stepper motor drive unit, a speed detection unit and a display screen communication unit, the main control unit is electrically connected to the stepper motor drive unit, the speed detection unit and the display screen communication unit respectively; the stepper motor drive unit is used to adjust the rotation state of the stepper motor according to the PWM signal of the main control unit, and its output is connected to the speed detection unit, and the speed detection unit is used to detect the speed state of the stepper motor; the display screen communication unit is used to send a display signal to the display screen.

[0008] Furthermore, the above-mentioned main control unit includes a first control chip U1, pins 10 and pin 11 of the first control chip U1 are respectively connected to the stepper motor drive unit, and the model of the first control chip U1 is STM32F103C8T6; pin 38 of the first control chip U1 is connected to the speed detection unit, and pins 21 and pin 22 of the first control chip U1 are respectively connected to the display screen communication unit.

[0009] Furthermore, the above-mentioned stepper motor drive unit includes a second control chip U2 and a third control chip U3, the model of the second control chip U2 is DRV8841, and the model of the third control chip U3 is 74LVC2G04; pin 22 of the second control chip U2 is connected to pin 4 of the third control chip U3, pin 21 of the second control chip U2 is connected to pin 6 of the third control chip U3, pin 23 of the second control chip U2 and pin 3 of the third control chip U3 are respectively connected to pin 10 of the first control chip U1, pin 16 of the second control chip U2 is connected to pin 15 of the first control chip U1, pin 20 of the second control chip U2 and pin 1 of the third control chip U3 are respectively connected to pin 11 of the first control chip U1; the second control chip U2 is used to adjust the speed of the stepper motor; the third control chip U3 is used to convert the PWM signal of the first control chip U1.

[0010] Furthermore, the rotation speed detection unit includes a Hall detection unit, wherein pin 1 of the Hall detection unit is connected to pin 38 of the first control chip U1, pin 2 of the Hall detection unit is grounded, and pin 3 of the Hall detection unit is connected to a power supply unit.

[0011] Furthermore, the display screen communication unit includes a fourth control chip U4, the model of the fourth control chip U1 is GM3085E; pin 1 of the fourth control chip U4 is connected to pin 22 of the first control chip U1, and pin 4 of the fourth control chip U4 is connected to pin 21 of the first control chip U1.

[0012] Furthermore, the above-mentioned display screen communication unit also includes a first voltage suppressor T1, and the model of the first voltage suppressor T1 is ESD05V23T-2A; pin 1 of the first voltage suppressor T1 is connected to pin 7 of the fourth control chip U4, and pin 2 of the first voltage suppressor T1 is connected to pin 6 of the fourth control chip U4.

[0013] Furthermore, the filter rotation control circuit further includes a power supply unit, which is electrically connected to the main control unit, the stepper motor drive unit, the rotation speed detection unit and the display screen communication unit respectively.

[0014] Furthermore, the power supply unit includes a fifth control chip U5, a sixth control chip U6 and a seventh control chip U7, pin 1 of the fifth control chip U5 is connected to pin 1 of the sixth control chip U6, and pin 3 of the sixth control chip U6 is connected to pin 3 of the seventh control chip U7; pin 7 of the fifth control chip U5, pin 3 of the sixth control chip U6 and pin 2 of the seventh control chip U7 are respectively used to supply power to the main control unit, the stepper motor drive unit, the speed detection unit and the display screen communication unit.

[0015] Furthermore, the above-mentioned PCB board includes the filter rotation control circuit.

[0016] Furthermore, the above-mentioned rotating device includes a bracket, a stepper motor and a speed regulator are arranged in the bracket, and the stepper motor is controlled by the filter rotation control circuit; the display screen is connected to the display screen communication unit in the filter rotation control circuit.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The utility model provides a filter rotation control circuit. When working, the main control unit receives the control command of the external host computer, and converts the control command into a PWM signal and sends it to the stepper motor drive unit. The stepper motor drive unit adjusts the speed, acceleration, deceleration and reversal of the stepper motor according to the PWM signal, thereby realizing flexible adjustment of the filter rotation state and improving the accuracy of measuring coherent light. Among them, the circuit of the main control unit adopts the input current control command to the stepper motor, and the circuit of the speed detection unit adopts the real-time reading technology. The combination of the two realizes stable rotation control.

[0019] 2. The utility model uses a speed detection unit to detect the speed of the stepper motor and feeds back the detection signal to the main control unit, and the main control unit uses a display communication unit to send the detection signal to an external display screen, and uses the display screen to display the rotation state of the stepper motor in real time. The rotation speed can be parameterized and fed back in real time, so that the user can mutually verify the coherent light result and the rotation state of the stepper motor in real time, thereby improving the measurement accuracy of the coherent light.

[0020] 3. The utility model adjusts the rotation state of the filter and improves the conventional function grouping circuit. The specific improvements are: ① Read the default parameters at startup to perform self-checking to ensure its stability. ② Parameter reading, feedback and iterative instructions are processed by integrated chips, and the response speed is very fast. ③ The circuit integration design can achieve overall shielding and eliminate impedance, reduce costs, and facilitate maintenance.

[0021] 4. Prepare an integrated circuit PCB board, including five circuits: main control unit, stepper motor drive circuit, speed detection, display screen communication, and power supply. The stepper motor rotation angular velocity parameters are set through the main control unit circuit, and the real-time parameter rotation state is obtained through the display screen. In this way, the influence of filter rotation on optical measurement coherence can be accurately and quantitatively determined. The operation is simple and convenient, which can effectively improve the experimental reproducibility of the rotating device, improve the efficiency of optical measurement, and effectively reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A circuit block diagram of the filter rotation control circuit provided by the utility model;

[0023] Figure 2 This is a circuit structure diagram of the main control unit in the filter rotation control circuit provided by the utility model;

[0024] Figure 3 This is a circuit structure diagram of the stepper motor drive unit in the filter rotation control circuit provided by the utility model;

[0025] Figure 4This is a circuit structure diagram of the rotation speed detection unit in the filter rotation control circuit provided by the utility model;

[0026] Figure 5 This is a circuit structure diagram of the display screen communication unit in the filter rotation control circuit provided by the utility model;

[0027] Figure 6 This is a circuit structure diagram of the power supply unit in the filter rotation control circuit provided by the utility model;

[0028] Figure 7 This is a schematic diagram of the overall structure of the rotating device provided by the utility model.

[0029] The accompanying drawings are described as follows: 1-main control unit, 2-stepping motor drive unit, 3-speed detection unit, 4-display communication unit, 5-power supply unit, 6-bracket, 7-stepping motor, 8-display, 9-speed regulator, 10-filter. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] In the description of the present utility model, it should be understood that the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0032] See also Figure 1 The utility model provides a filter rotation control circuit, including a main control unit 1, a stepper motor drive unit 2, a speed detection unit 3, a power supply unit 5 and a display screen communication unit 4, wherein the main control unit 1 is electrically connected to the stepper motor drive unit 2, the speed detection unit 3 and the display screen communication unit 4 respectively; the stepper motor drive unit 2 is used to adjust the rotation state of the stepper motor 7 according to the PWM signal of the main control unit 1; the speed detection unit 3 is used to detect the speed state of the stepper motor 7; the display screen communication unit 4 is used to send a display signal to the display screen 8.

[0033] The power supply unit 5 is electrically connected to the main control unit 1, the stepper motor drive unit 2, the speed detection unit 3 and the display screen communication unit 4 respectively; the power supply unit 5 is used to convert the external voltage into a multi-level voltage to simultaneously meet the power supply requirements of the main control unit 1, the stepper motor drive unit 2, the speed detection unit 3 and the display screen communication unit 4.

[0034] The working principle of the present application is as follows: the main control unit 1 receives the control instruction of the external host computer, and converts the control instruction into a PWM signal and sends it to the stepper motor drive unit 2, and the stepper motor drive unit 2 adjusts the control operations such as the acceleration action, deceleration action and reversal action of the stepper motor 7 according to the PWM signal, so as to realize the flexible adjustment of the rotation state of the filter 10 and improve the accuracy of measuring the coherent light. In addition, the speed detection unit 3 is used to detect the speed of the stepper motor 7, and the detection signal is fed back to the main control unit 1, and the main control unit 1 uses the display screen communication unit 4 to send the detection signal to the external display screen 8, and uses the display screen 8 to display the rotation state of the stepper motor 7 in real time, so that the user can check the coherent light result and the rotation state of the stepper motor 7 in real time, thereby improving the measurement accuracy of the coherent light.

[0035] like Figure 2 As shown, the main control unit 1 includes a first control chip U1, pins 10 and 11 of the first control chip U1 are respectively connected to the stepper motor drive unit 2, pin 38 of the first control chip U1 is connected to the speed detection unit 3, and pins 21 and 22 of the first control chip U1 are respectively connected to the display screen communication unit 4; when working, pins 10 and 11 of the first control chip U1 respectively send PWM modulation signals to the stepper motor drive unit 2, so that the stepper motor drive unit 2 controls the stepper motor 7; in addition, the first control chip U1 uses pin 38 to receive the detection signal of the speed detection unit 3, and sends a display signal to the display screen communication unit 4 through pins 21 and pin 22, so that the external display screen 8 can display the rotation state of the stepper motor 7 in real time.

[0036] In this embodiment, the first control chip U1 may be a microcontroller chip of model STM32F103C8T6.

[0037] like Figure 3As shown, in the filter rotation control circuit, the stepper motor drive unit 2 includes a second control chip U2 and a third control chip U3, the pin 22 of the second control chip U2 is connected to the pin 4 of the third control chip U3, the pin 21 of the second control chip U2 is connected to the pin 6 of the third control chip U3, the pin 23 of the second control chip U2 and the pin 3 of the third control chip U3 are respectively connected to the pin 10 of the first control chip U1, the pin 16 of the second control chip U2 is connected to the pin 15 of the first control chip U1, the pin 20 of the second control chip U2 and the pin 1 of the third control chip U3 are respectively connected to the pin 11 of the first control chip U1; the third The second control chip U2 is used to adjust the rotation speed of the stepper motor 7; the third control chip U3 is used to convert the PWM signal of the first control chip U1; when in use, the second control chip U2 uses pins 20 and 23 to receive the PWM modulation signal of the first control chip U1, so that the second control chip U2 controls the forward rotation state of the stepper motor 7, and uses different pulse widths to adjust the rotation speed of the stepper motor 7 during forward rotation; and the third control chip U3 acts as a logic inverter, and the logic level of the first control chip U1 is reversely converted through the third control chip U3 to achieve signal inversion, so that the second control chip U2 controls the reverse rotation state of the stepper motor 7, and uses different pulse widths to adjust the rotation speed of the stepper motor 7 during reverse rotation.

[0038] In this embodiment, the second control chip U2 may be a motor drive chip of model DRV8841; and the third control chip U3 may be an inverting logic chip of model 74LVC2G04.

[0039] like Figure 4 As shown, the speed detection unit 3 includes a Hall detection unit, wherein pin 1 of the Hall detection unit is connected to pin 38 of the first control chip U1, pin 2 of the Hall detection unit is grounded, and pin 3 of the Hall detection unit is connected to an external power supply; when working, the rotation state of the stepper motor 7 is detected by the Hall detection unit, and pin 1 is used to feed back a detection signal to pin 38 of the first control chip U1, so that the first control chip U1 sends the detection signal to the display screen communication unit 4.

[0040] In this embodiment, the Hall detection unit may be an existing Hall element structure, and the specific structure and working principle are all existing technologies and will not be described in detail here.

[0041] like Figure 5As shown, the display screen communication unit 4 includes a fourth control chip U4, and the pin 1 of the fourth control chip U4 is connected to the pin 22 of the first control chip U1, and the pin 4 of the fourth control chip U4 is connected to the pin 21 of the first control chip U1; the fourth control chip U4 is used as a communicator between the first control chip U1 and the display screen 8, and the fourth control chip U1 is used to send the detection signal of the first control chip U1 to the display screen 8 in real time, so that the display screen 8 can display the speed information of the stepping motor 7 in real time, so that the user can record the speed information.

[0042] In this embodiment, the fourth control chip U1 may be a RS485 communication chip of model GM3085E.

[0043] like Figures 1 to 6 As shown, further, the display screen communication unit 4 also includes a first voltage suppressor T1, and the pin 1 of the first voltage suppressor T1 is connected to the pin 7 of the fourth control chip U4, and the pin 2 of the first voltage suppressor T1 is connected to the pin 6 of the fourth control chip U4; the first voltage suppressor T1 can be used to protect the fourth control chip U4, which can quickly respond and limit the transient voltage peak in the circuit, reduce it to a safe range, and prevent overvoltage from damaging the fourth control chip U4 and the display screen 8.

[0044] In this embodiment, the first voltage suppressor T1 may be a transient voltage suppressor of model ESD05V23T-2A.

[0045] like Figure 6 As shown, the power supply unit 5 includes a fifth control chip U5, a sixth control chip U6 and a seventh control chip U7, wherein the pin 1 of the fifth control chip U5 is connected to the pin 1 of the sixth control chip U6, and the pin 3 of the sixth control chip U6 is connected to the pin 3 of the seventh control chip U7; the pin 7 of the fifth control chip U5, the pin 3 of the sixth control chip U6 and the pin 2 of the seventh control chip U7 are respectively used to supply power to the main control unit 1, the stepper motor drive unit 2, the speed detection unit 3 and the display screen communication unit 4; when in use, the fifth control chip U5 is used to step down the external 36V voltage to 12V, and then the sixth control chip U6 is used to step down the 12V voltage to 5V, and finally the seventh control chip U7 is used to step down the 5V voltage to 3.3V, thereby forming a multi-stage step-down circuit and realizing multi-stage voltage output, thereby simultaneously meeting the power supply requirements of the main control unit 1, the stepper motor drive unit 2, the speed detection unit 3 and the display screen communication unit 4.

[0046] In this embodiment, the fifth control chip U5 may be a buck chip of model TD1660; the sixth control chip U6 may be a buck chip of model 78M05; and the seventh control chip U7 may be a buck chip of model CJT1117B-3.3.

[0047] The present application also provides a PCB board printed with the filter rotation control circuit as described above.

[0048] like Figure 7 As shown, the present application also provides a rotating device, which uses the above-mentioned filter rotation control circuit for work control; the rotating device includes a bracket 6, and the bracket 6 is provided with a stepper motor 7, a display screen 8, a filter 10 and a speed regulator 9. When in use, the speed regulator 9 sends a control signal to the filter rotation control circuit, so that the filter rotation control circuit feedback controls the rotation state of the stepper motor 7, thereby adjusting the rotation state, and the display screen 8 is used to display the speed information of the stepper motor 7.

[0049] The working process of the utility model is: the main control unit 1 receives the control instruction of the external host computer, and converts the control instruction into a PWM signal and sends it to the stepper motor drive unit 2, and the stepper motor drive unit 2 adjusts the control operations such as the acceleration action, the deceleration action and the reversal action of the stepper motor 7 according to the PWM signal, so as to realize the flexible adjustment of the rotation state of the filter 10 and improve the accuracy of measuring the coherent light. In addition, the speed detection unit 3 is used to detect the speed of the stepper motor 7, and the detection signal is fed back to the main control unit 1, and the main control unit 1 uses the display communication unit 4 to send the detection signal to the external display screen 8, and uses the display screen 8 to display the rotation state of the stepper motor 7 in real time, so that the user can check the result of the coherent light and the rotation state of the stepper motor 7 in real time, thereby improving the measurement accuracy of the coherent light.

[0050] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the claims attached to the utility model.

Claims

1. A filter rotation control circuit, characterized in that: The invention comprises a main control unit (1), a stepper motor drive unit (2), a rotation speed detection unit (3) and a display screen communication unit (4), wherein the main control unit (1) is electrically connected to the stepper motor drive unit (2), the rotation speed detection unit (3) and the display screen communication unit (4) respectively; the stepper motor drive unit (2) is used to adjust the rotation state of the stepper motor (7) according to the PWM signal of the main control unit (1), and its output is connected to the rotation speed detection unit (3); the rotation speed detection unit (3) is used to detect the rotation speed state of the stepper motor (7); and the display screen communication unit (4) is used to send a display signal to a display screen (8).

2. The filter rotation control circuit according to claim 1, characterized in that: The main control unit (1) comprises a first control chip U1, wherein pins 10 and 11 of the first control chip U1 are respectively connected to the stepper motor drive unit (2), and the model of the first control chip U1 is STM32F103C8T6; pin 38 of the first control chip U1 is connected to the rotation speed detection unit (3), and pins 21 and 22 of the first control chip U1 are respectively connected to the display screen communication unit (4).

3. The filter rotation control circuit according to claim 2, characterized in that: The stepper motor drive unit (2) comprises a second control chip U2 and a third control chip U3, the model of the second control chip U2 is DRV8841, and the model of the third control chip U3 is 74LVC2G04; the pin 22 of the second control chip U2 is connected to the pin 4 of the third control chip U3, the pin 21 of the second control chip U2 is connected to the pin 6 of the third control chip U3, the pin 23 of the second control chip U2 and the pin 3 of the third control chip U3 are respectively connected to the pin 10 of the first control chip U1, the pin 16 of the second control chip U2 is connected to the pin 15 of the first control chip U1, and the pin 20 of the second control chip U2 and the pin 1 of the third control chip U3 are respectively connected to the pin 11 of the first control chip U1; the second control chip U2 is used to adjust the rotation speed of the stepper motor (7); and the third control chip U3 is used to convert the PWM signal of the first control chip U1.

4. The filter rotation control circuit according to claim 2 or 3, characterized in that: The rotation speed detection unit (3) comprises a Hall detection unit, wherein pin 1 of the Hall detection unit is connected to pin 38 of the first control chip U1, pin 2 of the Hall detection unit is grounded, and pin 3 of the Hall detection unit is connected to a power supply unit (5).

5. The filter rotation control circuit according to claim 4, characterized in that: The display screen communication unit (4) comprises a fourth control chip U4, the model of the fourth control chip U1 is GM3085E; pin 1 of the fourth control chip U4 is connected to pin 22 of the first control chip U1, and pin 4 of the fourth control chip U4 is connected to pin 21 of the first control chip U1.

6. The filter rotation control circuit according to claim 5, characterized in that: The display screen communication unit (4) further comprises a first voltage suppressor T1, the model of the first voltage suppressor T1 is ESD05V23T-2A; pin 1 of the first voltage suppressor T1 is connected to pin 7 of the fourth control chip U4, and pin 2 of the first voltage suppressor T1 is connected to pin 6 of the fourth control chip U4.

7. The filter rotation control circuit according to claim 6, characterized in that: The filter (10) rotation control circuit further comprises a power supply unit (5), wherein the power supply unit (5) is electrically connected to the main control unit (1), the stepping motor drive unit (2), the rotation speed detection unit (3) and the display screen communication unit (4) respectively.

8. The filter rotation control circuit according to claim 7, characterized in that: The power supply unit (5) comprises a fifth control chip U5, a sixth control chip U6 and a seventh control chip U7; pin 1 of the fifth control chip U5 is connected to pin 1 of the sixth control chip U6, and pin 3 of the sixth control chip U6 is connected to pin 3 of the seventh control chip U7; pin 7 of the fifth control chip U5, pin 3 of the sixth control chip U6 and pin 2 of the seventh control chip U7 are respectively used to supply power to the main control unit (1), the stepping motor drive unit (2), the speed detection unit (3) and the display screen communication unit (4).

9. A PCB board, characterized in that: It comprises a filter (10) rotation control circuit as claimed in any one of claims 1 to 8.

10. A rotating device, characterized in that: The rotating device comprises a bracket (6), a stepping motor (7) and a speed regulator (9) are arranged in the bracket (6), and the stepping motor (7) is controlled by the filter rotation control circuit according to any one of claims 1 to 8; the display screen (8) is connected to the display screen communication unit (4) in the filter rotation control circuit.

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