Anti-electromagnetic interference device for USBCNC numerical control equipment

Abstract

The utility model relates to a communication anti-electromagnetic interference technology of numerical control equipment, in particular to an anti-electromagnetic interference device of USBCNC (Universal Serial Bus Computerized Numerical Control) numerical control equipment, which is formed by matching a USB isolation chip ADUM4160 with a power supply filter EMI (Electro-Magnetic Interference) module, the power supply filter EMI module provides a working power supply for the equipment, meanwhile, the power supply filter EMI module is connected with a DC5V switching power supply module, and the DC5V switching power supply module is connected with the USB isolation chip ADUM4160. The DC5V switching power supply module is electrically connected with the main control board which is formed by taking an ADUM4160 chip as a core, and provides a DC5V power supply required by the USB isolation main control board; the USB isolation chip ADUM4160 chip circuit main control board is provided with two USB communication ports, and a USB input interface of the ADUM4160 main control board is connected with a USB interface of a computer; and the USB output interface of the ADUM4160 main control board is connected with the input USB port of the USBCNC shaft motion controller. According to the utility model, electromagnetic interference except for useful signals in the machining process of the numerical control equipment can be effectively filtered, the anti-electromagnetic interference effect of the numerical control equipment of the USBCNC control system is improved, and the operation stability and safety of the equipment are further improved.

Description

Technical Field

[0001] The utility model relates to a communication anti-electromagnetic interference technology for numerical control equipment, in particular to an anti-electromagnetic interference device for numerical control machine tools which adopts a USBCNC control system and uses a USB port of a computer for communication control. Background Art

[0002] With the continuous development of modern science and technology, the USBCNC axis motion control system using USB port communication control is widely used in CNC equipment such as engraving machines, laser cutting machines, and automatic welding. Due to its simple structure and economical price, it can realize fast, efficient, and precise processing of CNC equipment, and can realize precise engraving and processing according to the design drawings, effectively saving labor costs and time costs; at the same time, it also reduces the waste and loss caused by human operation, so it has broad application prospects and important significance. However, these CNC equipment are easily interfered by electromagnetic pollution sources generated by various electrical equipment around the workshop, especially high-frequency quenching equipment, when working. Harmonics in the power supply and harmonics in nature can cause false alarms, false operations, and refusal to operate in the servo drive system. More seriously, it may cause the rectifier module and electrolytic capacitor in the servo drive to overheat, burst, and explode. This is more likely to cause the CNC equipment using this control system to be dislocated after being disturbed for the highly sensitive USBCNC control system, causing the control system and the host computer to be unable to communicate. In severe cases, the machine crashes and makes it unable to work, which makes it difficult for the normal use of the equipment. Therefore, solving the electromagnetic interference problem of this CNC equipment has become the key. Utility Model Content

[0003] The utility model provides an anti-electromagnetic interference device to solve the problem of avoiding electromagnetic interference other than useful signals during the production process of numerical control equipment adopting a USBCNC control system.

[0004] The device can effectively filter out electromagnetic interference other than useful signals during the processing of CNC equipment by using an electromagnetic filter EMI module and a USB isolation chip ADUM4160 circuit combination, thereby improving the anti-electromagnetic interference effect of USBCNC control system CNC equipment, thereby improving the stability and safety of equipment operation, and greatly improving product quality and production efficiency.

[0005] The technical solution adopted by this utility model:

[0006] An anti-electromagnetic interference device for numerically controlled machine tools using USB communication control is designed. The main control board is composed of a USB isolation chip as the core and peripheral electronic circuits. The USB isolation chip of the main control board adopts ADUM4160. The anti-electromagnetic interference device is composed of the USB isolation chip ADUM4160 and a power filter EMI module. The power filter EMI module provides working power for the equipment. At the same time, a DC5V switching power supply module is connected to the power filter EMI module. The DC5V switching power supply module is electrically connected to the main control board composed of the ADUM4160 chip as the core to provide the DC5V power required by the USB isolation main control board; the USB isolation chip ADUM4160 chip circuit main control board is provided with two USB communication ports, wherein the USB input interface on the ADUM4160 main control board is connected to the USB interface of the computer; the USB output interface on the ADUM4160 main control board is connected to the USB input port of the USBCNC axis motion controller.

[0007] In the anti-electromagnetic interference device, an 824015 chip is connected to the USB isolation chip ADUM4160 on the main control board. The 824015 chip is an ESD electrostatic protector that protects USB 2.0 and serial bus interfaces. The VDD end of the 824015 chip is connected to the VBUS1 port of the ADUM4160 through a pull-up resistor R3, and the port is also connected to the IQ4 port of the 824015 chip; the IQ2 and IQ3 ends of the 824015 chip are respectively connected to the two data communication ports of the ADUM4160; the VBUS2 port of the ADUM4160 is connected to the power supply end of another USB Type B connector, and the data ports of the USB Type B connector are respectively connected to another group of data communication ports of the ADUM4160.

[0008] The anti-electromagnetic interference device, the power filter EMI is an independent unit module, and the mains single-phase or three-phase power supply can be freely selected; the power filter EMI is composed of a network of passive electronic components, these components are composed of capacitors and inductors to form an LC circuit, the inductive part of the power filter EMI acts as a low-pass device to allow the AC line frequency to pass, and uses capacitors to shunt or divert harmful high-frequency noise.

[0009] Beneficial effects of the utility model:

[0010] 1. The utility model has a good effect on improving the anti-interference of USBCNC control system numerical control equipment, and greatly improves the operation stability of the equipment. The USB isolation chip ADUM4160 is used as the core and cooperates with peripheral electronic circuits to solve the anti-electromagnetic interference of numerical control machine tools that use USBCNC control system to control by USB port communication. The USB isolation chip ADUM4160 combines high-speed CMOS technology with monolithic air-core transformer technology, and is easy to integrate with low-speed and full-speed USB compatible peripherals. The USB line automatically switches between actively driving D+ / D−, receiving data, and allowing external resistors to set the bus idle state. The ADuM4160 structure can detect the direction of data flow and control the state of the output buffer at the same time. The ADuM4160 combines the edge detection-based ICOUPLER technology with internal logic to achieve a transparent, easy-to-configure, upstream-facing port isolator. Fully compatible with USB 2.0 low-speed and full-speed data speeds.

[0011] 2. The utility model uses a power filter module EMI to suppress electromagnetic interference through careful design, so as to reduce various clutter and nonlinear distortion interference and harmonic interference in the power circuit, keep the noise generated inside the electronic device from leaking outward, and prevent the noise generated by the AC line outside the electronic device from entering the device; secondly, the USB isolation chip ADUM4160 chip circuit combination is used to avoid the high-sensitivity USBCNC control system numerical control equipment from being misaligned after being subjected to external electromagnetic interference, and causing the control system and the host computer to be unable to communicate, and in severe cases causing the machine to freeze and make it unable to work, causing difficulties for the normal use of the equipment. The electromagnetic interference filter is composed of a network of passive electronic components, which include capacitors and inductors, which form an LC circuit and play a role by selectively blocking or shunting harmful high frequencies. The inductive part of the electromagnetic interference filter acts as a low-pass device to pass the AC line frequency, and is a high-frequency cutoff device. The other parts of the electromagnetic interference filter use capacitors to shunt or shunt harmful high-frequency noise, so that these harmful high-frequency noises cannot reach sensitive circuits. In this way, the electromagnetic interference filter significantly reduces or attenuates all harmful noise signals that are about to enter or leave the protected electronic device. The power filter is connected to the power grid to convert the mains power into AC200 or 380V single-line or three-phase AC power to supply the computer or DC5V switching power supply, servo drive motor or stepper motor, which greatly improves the operation stability of the equipment, makes it easy to obtain stable and safe operation functions, and helps to improve production efficiency.

[0012] 3. The anti-electromagnetic interference device of the utility model can prevent electromagnetic interference other than useful signals in the processing of USBCNC control system numerical control equipment, mainly including: harmonics in the power supply and harmonics in nature. The device prevents the false alarm, malfunction and refusal of the servo drive in the servo drive system caused by the harmonics in the power supply and the harmonics in nature through the power filter EMI module, which can avoid the series of problems such as overheating, bursting and explosion of the rectifier module and electrolytic capacitor in the servo drive in serious cases.

[0013] 4. The utility model has the characteristics of simple structure, light weight, small size, easy installation, safety and reliability. The use of the power filter EMI module can improve the quality of the power supply, the linearity of the circuit, and reduce various clutter and nonlinear distortion interference and harmonic interference. The USB isolation chip ADUM4160 combined with the peripheral electronic circuit solves the problem of electromagnetic interference interfering with the highly sensitive USBCNC control system, causing the axis movement trajectory to be misaligned, and the control system and the host computer cannot communicate. In severe cases, the CNC machine tool equipment freezes. It has a good effect on improving the anti-interference of CNC machine tools using USBCNC control systems, and also greatly improves the stability of equipment operation, which has a positive role in improving production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure shows the circuit composition principle block diagram and application scenario of the anti-electromagnetic interference device of the utility model;

[0015] Figure 2 The figure shows the circuit schematic diagram of the power filter EMI module of the utility model anti-electromagnetic interference device;

[0016] Figure 3 The figure shows the principle block diagram of the USB isolation main control board of the anti-electromagnetic interference device of the utility model;

[0017] Figure 4 The figure shows the circuit schematic diagram of the USB isolation main control board of the anti-electromagnetic interference device of the utility model;

[0018] Figure 5 The utility model discloses an electrical control box panel arrangement of the anti-electromagnetic interference device. DETAILED DESCRIPTION

[0019] In order to make the technical concept and advantages of the utility model creation to achieve its utility model purpose more clear, the technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the following embodiments are only used to explain and illustrate the preferred implementation of the utility model and should not constitute a limitation on the scope of protection of the utility model patent claim.

[0020] Example 1

[0021] See also Figure 3 The utility model uses a USB communication-controlled CNC machine tool anti-electromagnetic interference device, which is composed of a USB isolation chip as the core and a peripheral electronic circuit to form a main control board. The main control board USB isolation chip adopts ADUM4160, and the anti-electromagnetic interference device is composed of the USB isolation chip ADUM4160 and a power filter EMI module. The power filter EMI module provides working power for the equipment, and a DC5V switching power supply module is connected to the power filter EMI module. The DC5V switching power supply module is electrically connected to the main control board composed of the ADUM4160 chip as the core to provide the DC5V power required by the USB isolation main control board; the USB isolation chip ADUM4160 chip circuit main control board is provided with two USB communication ports, wherein the ADUM4160 main control board onboard USB input interface is connected to the computer's USB interface; the ADUM4160 main control board onboard USB output interface is connected to the USBCNC axis motion controller input USB port.

[0022] like Figure 1 , Figure 3 , Figure 4 As shown, two USB communication ports are electrically connected to a computer with CNCUSB CONTROLLER software and a USBCNC axis motion controller to realize system communication (realize data transmission and exchange); the USBCNC axis motion controller is electrically connected to a servo driver or a stepper motor driver, and the output end of the stepper motor or servo driver is electrically connected to the control input end of the stepper motor or servo motor, and the feed axis is controlled by the stepper motor or servo motor to realize the feed axis movement. The analog output interface (0-1V) of the USBCNC axis motion controller is electrically connected to the analog interface (0-1V) of the frequency converter spindle, and the power output end of the frequency converter is electrically connected to the spindle motor to provide a power source for the spindle motor of the CNC machine tool equipment.

[0023] The anti-electromagnetic interference device composed of the USB isolation main control board with the USB isolation chip ADUM4160 as the core and the power filter EMI has an independent DC5V switching power supply. The power filter EMI module converts the mains power into voltage sources of different levels required by the anti-electromagnetic interference device. The DC5V switching power supply output interface is electrically connected to the power input interface of the main control board with the USB isolation chip ADUM4160 as the core, providing the required DC5V direct current regulated power supply for the USB isolation main control board.

[0024] Example 2

[0025] The anti-electromagnetic interference device for CNC machine tools of this embodiment is different from that of Embodiment 1 in that: further, an 824015 chip is connected to the USB isolation chip ADUM4160 on the main control board, and the 824015 chip is an ESD electrostatic protector for protecting USB 2.0 and serial bus interfaces. The VDD end of the 824015 chip is connected to the VBUS1 port of ADUM4160 through a pull-up resistor R3, and the port is also connected to the IQ4 port of the 824015 chip; the IQ2 and IQ3 ends of the 824015 chip are respectively connected to the two data communication ports of ADUM4160.

[0026] Example 3

[0027] The difference between the CNC machine tool anti-electromagnetic interference device of this embodiment and embodiments 1 and 2 is that: further, the power filter EMI is composed of a network of passive electronic components, which include capacitors and inductors, which form an LC circuit and play a role by selectively blocking or shunting harmful high frequencies. The inductive part of the power filter EMI acts as a low-pass device to allow the AC line frequency to pass through, and is a high-frequency cutoff device. The other parts of the power filter EMI use capacitors to shunt or shunt harmful high-frequency noise, so that these harmful high-frequency noises cannot reach sensitive circuits. In this way, the power filter EMI significantly reduces or attenuates all harmful noise signals that are about to enter or leave the protected electronic devices.

[0028] refer to Figure 2 In this device, the power filter EMI converts the mains power into AC200 or 380V single-line or three-phase AC power to supply the computer, USBCNC axis controller, and DC5V switching power supply. The DC5V DC power provided by the switching power supply provides the power voltage required by the ADUM4160 main control USB isolation board.

[0029] The utility model adopts a power filter module EMI to suppress electromagnetic interference, especially electronic circuit equipment with noise in the power line or control signal line, to keep the noise generated inside the electronic equipment from leaking outward, and to prevent the noise generated by the AC line outside the electronic equipment from entering the equipment.

[0030] The utility model uses a USB communication controlled CNC machine tool anti-electromagnetic interference device, which is completed with a USB isolation chip ADUM4160 as the core and peripheral electronic circuits, and is used to solve the problem of using a USBCNC control system to control CNC machine tool equipment using USB port communication. ADuM4160 is a USB communication isolation main control board.

[0031] refer to Figure 3 , Figure 4The circuit schematic and block diagram of this device are mainly based on the ADUM4160 isolation chip, and only a few peripheral resistors and capacitors are needed to form the USB isolation main control board circuit. The chip ADUM4160 combines high-speed CMOS technology with monolithic air-core transformer technology, and is easy to integrate with low-speed and full-speed USB compatible peripherals. The USB line automatically switches between actively driving D+ / D−, receiving data, and allowing external resistors to set the bus idle state. The ADuM4160 structure can detect the direction of data flow and control the state of the output buffer at the same time. The ADuM4160 combines the edge detection-based ICOUPLER technology with internal logic to achieve a transparent, easy-to-configure, upstream-facing port isolator that is fully compatible with USB 2.0 low-speed and full-speed data rates; the D+ and D− lines have short-circuit protection function. High common-mode transient immunity: >25 KV / μs.

[0032] The USB isolation chip ADUM4160 chip has two USB communication ports on the main control board, which are electrically connected to the USBCNC axis motion controller and the computer USB port for communication. The output end of the stepper or servo driver is electrically connected to the control input end of the stepper or servo motor. The DC5V switching power supply is electrically connected to the USB isolation chip ADUM4160 chip main control board to provide the DC5V power supply required by the USB isolation main control board. The USBCNC axis controller is electrically connected to the stepper drive, and the stepper or servo motor is electrically connected to the stepper drive to control the movement of the feed axis. The USBCNC axis controller is electrically connected to the frequency converter, and the frequency converter is electrically connected to the spindle motor to provide a spindle power source.

[0033] Figure 5 This is the electrical operation box of the anti-electromagnetic interference device of the utility model. An air switch 1 is provided on the chassis panel to control the on and off of the power supply of the anti-electromagnetic interference device, and has functions such as overload and overheat protection. The operation panel is provided with a system power-on indicator light 2, a voltmeter 3, an ammeter display device 4 and an electrical connection with the output end of the power filter, which is convenient for monitoring and checking the operating status of the equipment, and monitoring and controlling the operation voltage and current of the device.

[0034] The utility model can effectively filter out electromagnetic interference other than useful signals in the processing process of numerical control equipment, can improve the anti-electromagnetic interference effect of USBCNC control system numerical control equipment, and improve the operation stability and safety of the equipment.

[0035] The above description is only a preferred embodiment of the utility model and does not constitute a limitation of the utility model. Under the guidance of the prior art, those skilled in the art can make other modifications to the implementation of the utility model without creative work. Any modification made within the spirit and principle of the utility model or simple replacement or equivalent replacement using conventional technical means in the field shall be included in the protection scope of the utility model.

Claims

1. A USBCNC numerical control equipment anti-electromagnetic interference device, comprising a USB isolation chip, characterized in that: The USBCNC numerical control equipment anti-electromagnetic interference device is composed of a USB isolation chip ADUM4160 and a power filter EMI module. The power filter EMI module provides working power for the equipment. At the same time, a DC5V switching power module is connected to the power filter EMI module. The DC5V switching power module is electrically connected to a main control board composed of an ADUM4160 chip as a core to provide the DC5V power required by the USB isolation main control board; the USB isolation chip ADUM4160 chip circuit main control board is provided with two USB communication ports, wherein the USB input interface on the ADUM4160 main control board is connected to the USB interface of the computer; the USB output interface on the ADUM4160 main control board is connected to the USB input port of the USBCNC axis motion controller.

2. The USBCNC numerical control equipment anti-electromagnetic interference device according to claim 1, characterized in that: The main control board is connected to the USB isolation chip ADUM4160 with an 824015 chip, which is an ESD electrostatic protector to protect the USB2.0 and serial bus interfaces. The VDD end of the 824015 chip is connected to the VBUS1 port of the ADUM4160 through a pull-up resistor R3, and the port is also connected to the IQ4 port of the 824015 chip. The IQ2 and IQ3 terminals of the 824015 chip are respectively connected to two data communication ports of ADUM4160; the VBUS2 port of the ADUM4160 is connected to the power supply terminal of another USB Type B connector, and the data port of the USB Type B connector is respectively connected to another group of data communication ports of ADUM4160.

3. The USBCNC numerical control equipment anti-electromagnetic interference device according to claim 1 or 2, characterized in that: The power filter EMI is an independent unit module, and a single-phase or three-phase power supply is selected; the power filter EMI is composed of a network of passive electronic components, and these components are composed of capacitors and inductors to form an LC circuit. The inductive part of the power filter EMI acts as a low-pass device to allow the AC line frequency to pass, and uses capacitors to shunt or divert harmful high-frequency noise.

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