Double-galvanometer control card

Abstract

The utility model relates to the technical field of laser processing, and discloses a double-galvanometer control card, which comprises a control circuit and a driving circuit, the input end of the control circuit is connected with an upper computer, the control circuit can receive digital signals output by the upper computer, and the output end of the control circuit is connected with the driving circuit. The output end of the drive circuit is connected with the horizontal galvanometer and the vertical galvanometer, and the drive circuit drives the horizontal galvanometer and the vertical galvanometer to swing through the output end after receiving a control instruction of the control circuit. The control circuit comprises an MCU communication module and a CPLD operation module, the input end of the MCU communication module is connected with the upper computer, the output end of the MCU communication module is connected with the CPLD operation module, and the output end of the CPLD operation module is connected with the driving circuit, so that the problems that a traditional galvanometer control system is complex in circuit, high in power, low in deflection angle precision and inflexible in control are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser processing, in particular to a double-vibrating mirror control card. Background Art

[0002] Galvanometer laser scanning technology is the most commonly used laser scanning technology in the field of laser processing. Galvanometer laser scanning plays an important role in laser marking, laser cutting, laser welding and other fields. Among them, the laser scanning system based on dual galvanometers adopts laser scanning technology. By using horizontal stepper motors and vertical stepper motors to drive the horizontal galvanometer and the vertical galvanometer to rotate at any angle in the horizontal and vertical directions, the measuring laser of the laser rangefinder can reach any point in the plane, thereby obtaining the coordinate data of the object in the scanning plane and extracting the contour of the object. In the dual galvanometer control card, the marking or processing commands generated by the host computer need to be converted by the control card and then transmitted to the galvanometer, so as to drive the galvanometer to work normally. Therefore, the conversion speed and accuracy of the control card are crucial in galvanometer laser scanning technology. Utility Model Content

[0003] The technical problem solved by the utility model is to propose a low-power, high-speed, high-precision galvanometer control card to improve the imaging efficiency of the galvanometer laser scanning system, aiming at the problems of complex circuits, high power consumption, low deflection angle accuracy, and inflexible control of traditional galvanometer control systems.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a dual-galvanometer control card, including a control circuit and a drive circuit, the input end of the control circuit is connected to a host computer, the control circuit can receive a digital signal output by the host computer, the output end of the control circuit is connected to the drive circuit, the output end of the drive circuit is respectively connected to a horizontal galvanometer and a vertical galvanometer, and after receiving the digital signal of the control circuit, the drive circuit drives the horizontal galvanometer and the vertical galvanometer to swing through the output end;

[0005] The control circuit comprises an MCU communication module and a CPLD operation module, the input end of the MCU communication module is connected to the host computer, the output end of the MCU communication module is connected to the CPLD operation module, and the output end of the CPLD operation module is connected to the drive circuit.

[0006] Furthermore, the driving circuit includes an input module, a D / A conversion module and a power amplifier, the output end of the control circuit is connected to the input module, the input module is used to receive the digital signal output by the control circuit, the input end of the D / A conversion module is connected to the input module, the output end of the D / A conversion module is connected to the power amplifier, the D / A conversion module is used to convert the digital signal received from the input module into an analog signal, and the output end of the power amplifier is connected to the horizontal galvanometer and the vertical galvanometer.

[0007] Furthermore, the analog signal output by the D / A conversion module is an analog voltage, and the range of the analog voltage is -5V to +5V.

[0008] Furthermore, the input module adopts a CPLD processor.

[0009] Furthermore, the control circuit also includes a communication interface, which is arranged between the host computer and the MCU communication module, the input end of the communication interface is connected to the host computer, and the output end of the communication interface is connected to the MCU communication module.

[0010] Furthermore, the communication interface is a low voltage differential signal interface LVDS.

[0011] Furthermore, the driving circuit also includes an angle feedback device, and the driving circuit feeds back the status information of the horizontal galvanometer and the vertical galvanometer to the control circuit through the angle feedback device.

[0012] Furthermore, the driving circuit also includes a current feedback device, and the current feedback device is arranged in parallel with the angle feedback device.

[0013] The beneficial effects achieved by the utility model are mainly as follows: the current galvanometer control system has high power consumption, and the communication rate between the internal control circuit and the drive circuit is low, the galvanometer control position accuracy is low, and the requirements of high-precision and high-speed galvanometer control cannot be met. The utility model provides a dual-galvanometer control card, including a control circuit and a drive circuit. The control circuit is responsible for receiving commands from a host computer and outputting a digital signal of the galvanometer swing angle to the drive circuit. The drive circuit receives the digital signal of the control circuit and converts the digital signal into an analog signal to drive the horizontal galvanometer and the vertical galvanometer to swing. The control circuit adopts an MCU+CPLD dual-processor mode. The high-speed logic processing capability of the CPLD can increase the drive frequency of the galvanometer and achieve high-precision and high-speed galvanometer control requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the system structure of the dual-galvanometer control card in the embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the control circuit structure of the dual-galvanometer control card in the embodiment of the utility model;

[0016] Figure 3 Schematic diagram of the driving circuit structure of the dual-galvanometer control card in the embodiment of the utility model.

[0017] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar numbers correspond to the same or similar parts. The terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations on this patent. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0020] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0021] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0022] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0023] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0024] Embodiment 1

[0025] In view of the problems of complex circuits, high power consumption, low deflection angle accuracy and inflexible control of traditional galvanometer control systems, this embodiment proposes a low-power, high-speed, high-precision galvanometer control card to improve the imaging efficiency of the galvanometer laser scanning system.

[0026] See also Figure 1-3 As shown, a dual-galvanometer control card includes a control circuit and a drive circuit, wherein the input end of the control circuit is connected to a host computer, and the control circuit can receive a digital signal output by the host computer, and the output end of the control circuit is connected to the drive circuit, and the output end of the drive circuit is respectively connected to a horizontal galvanometer and a vertical galvanometer. After receiving the digital signal of the control circuit, the drive circuit drives the horizontal galvanometer and the vertical galvanometer to swing through the output end.

[0027] The control circuit comprises an MCU communication module and a CPLD operation module, the input end of the MCU communication module is connected to the host computer, the output end of the MCU communication module is connected to the CPLD operation module, and the output end of the CPLD operation module is connected to the drive circuit.

[0028] The current galvanometer control system has high power consumption, and the communication rate between the internal control circuit and the drive circuit is low, the galvanometer control position accuracy is low, and the requirements of high-precision and high-speed galvanometer control cannot be met. The dual galvanometer control card proposed in this embodiment includes a control circuit and a drive circuit. The control circuit is responsible for receiving commands from the host computer and outputting a digital signal of the galvanometer swing angle to the drive circuit. The drive circuit receives the digital signal of the control circuit and converts the digital signal into an analog signal to drive the horizontal galvanometer and the vertical galvanometer to swing. Due to the high accuracy requirements for the needle mirror swing angle, the control circuit needs to output a high-speed, stable and accurate digital signal, which requires the control circuit to have high-speed and high-precision digital processing and communication capabilities. The control circuit in this embodiment adopts an MCU+CPLD dual processor mode. The CPLD calculates the digital control information required for the galvanometer swing angle. The MCU is responsible for communicating with the host computer and controlling the CPLD. The high-speed logic processing capability of the CPLD can increase the drive frequency of the galvanometer and achieve high-precision and high-speed galvanometer control requirements.

[0029] Furthermore, in order to ensure the swing accuracy and response speed of the galvanometer system, an angle feedback device and a current feedback device are also provided in the driving circuit. The current feedback device is arranged in parallel with the angle feedback device. During specific implementation, the system is initialized and self-checked, and waits for the host computer to send a control instruction. When the host computer issues a control instruction to the galvanometer control system, the control circuit in the control system decodes the instruction and outputs a corresponding digital signal to the driving circuit. The driving circuit outputs the predetermined swing angle information to the galvanometer. At the same time, the galvanometer swing state information is fed back to the control circuit through the current feedback device and the angle feedback device, thereby realizing the control of the galvanometer. By arranging the current feedback device and the angle feedback device, this embodiment can improve the swing accuracy and response speed of the galvanometer, and realize the galvanometer to swing accurately, quickly and stably following the input position signal.

[0030] Furthermore, the driving circuit includes an input module, a D / A conversion module and a power amplifier, the output end of the control circuit is connected to the input module, the input module is used to receive the digital signal output by the control circuit, the input end of the D / A conversion module is connected to the input module, the output end of the D / A conversion module is connected to the power amplifier, the D / A conversion module is used to convert the digital signal received from the input module into an analog signal, and the output end of the power amplifier is connected to the horizontal galvanometer and the vertical galvanometer; wherein the analog signal output by the D / A conversion module is an analog voltage, the range of the analog voltage is -5V to +5V, and the input module adopts a CPLD processor.

[0031] The driving circuit receives the control instructions of the control circuit through the input module, wherein differential signals are used to transmit data between the input module and the control circuit. In this embodiment, the D / A conversion module is a 16-bit digital-to-analog conversion chip. The D / A conversion module converts the input control instructions into analog signals. After the analog signals are amplified by the power amplifier, they drive the galvanometer to swing. The driving circuit also feeds back the galvanometer swing state to the control circuit.

[0032] Furthermore, the control circuit also includes a communication interface, which is arranged between the host computer and the MCU communication module, the input end of the communication interface is connected to the host computer, and the output end of the communication interface is connected to the MCU communication module. At the same time, in order to improve the high-speed and anti-electromagnetic interference data transmission capability between the driving circuit, this embodiment adopts a low-voltage differential signal interface LVDS with high transmission rate, low noise, long distance and high accuracy.

[0033] During the specific implementation, the host computer sets the oscillation angle and frequency of the galvanometer, and the MCU communication module and CPLD operation module in the control circuit perform self-test. After the self-test is successful, the MCU communication module waits for the host computer command. After receiving the host computer command, the position data, oscillation frequency data and oscillation angle data required for controlling the galvanometer swing angle are calculated according to the command requirements, and the above data information is passed to the CPLD operation module. The CPLD operation module transmits the data information to the drive circuit. After the drive circuit receives the oscillation angle information of the control circuit, the control and D / A conversion modules output the corresponding analog voltage to drive the galvanometer to swing. The drive motor also feeds back the status information of the galvanometer to the control circuit through the angle feedback device and the current feedback device. The control circuit monitors the galvanometer swing angle status reported by the drive circuit in real time, and corrects the relevant parameters according to the galvanometer status to realize the follow-up control and continuous control of the galvanometer.

[0034] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A dual galvanometer control card, characterized in that: It includes a control circuit and a drive circuit, wherein the input end of the control circuit is connected to a host computer, the control circuit can receive a digital signal output by the host computer, the output end of the control circuit is connected to the drive circuit, the output end of the drive circuit is respectively connected to a horizontal galvanometer and a vertical galvanometer, and after receiving the digital signal of the control circuit, the drive circuit drives the horizontal galvanometer and the vertical galvanometer to swing through the output end; The control circuit comprises an MCU communication module and a CPLD operation module, the input end of the MCU communication module is connected to the host computer, the output end of the MCU communication module is connected to the CPLD operation module, and the output end of the CPLD operation module is connected to the drive circuit.

2. The dual galvanometer control card according to claim 1, characterized in that: The driving circuit includes an input module, a D / A conversion module and a power amplifier. The output end of the control circuit is connected to the input module, and the input module is used to receive the digital signal output by the control circuit. The input end of the D / A conversion module is connected to the input module, and the output end of the D / A conversion module is connected to the power amplifier. The D / A conversion module is used to convert the digital signal received from the input module into an analog signal, and the output end of the power amplifier is connected to the horizontal galvanometer and the vertical galvanometer.

3. The dual-galvanometer control card according to claim 2, characterized in that: The analog signal output by the D / A conversion module is an analog voltage, and the range of the analog voltage is -5V to +5V.

4. The dual-galvanometer control card according to claim 2, characterized in that: The input module adopts a CPLD processor.

5. The dual-galvanometer control card according to claim 1, characterized in that: The control circuit also includes a communication interface, which is arranged between the host computer and the MCU communication module, the input end of the communication interface is connected to the host computer, and the output end of the communication interface is connected to the MCU communication module.

6. The dual-galvanometer control card according to claim 5, characterized in that: The communication interface is a low voltage differential signal interface LVDS.

7. The dual-galvanometer control card according to claim 1, characterized in that: The driving circuit further comprises an angle feedback device, through which the driving circuit feeds back the state information of the horizontal galvanometer and the vertical galvanometer to the control circuit.

8. The dual-galvanometer control card according to claim 7, characterized in that: The driving circuit further comprises a current feedback device, and the current feedback device is arranged in parallel with the angle feedback device.

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