Extended conversion circuit for a laser

Abstract

The utility model discloses an extension conversion circuit for laser, extension conversion circuit is connected between laser controller and laser head drive circuit to convert digital control signal into analog signal or drive signal, extension conversion circuit includes: impedance matching unit, impedance matching unit's input end is linked with laser controller's output, is used to carry out impedance matching to the digital control signal received, buffer chip, buffer chip's input end is linked with impedance matching unit's output, is used to carry out the impedance matching after digital control signal to the buffering and power amplification, output unit, output unit's input end is linked with buffer chip's output, the utility model discloses through the high -speed buffer and impedance matching design, solved the signal delay high, the problem of poor anti -interference ability in the prior art, effectively promoted the control precision and equipment compatibility of laser processing.

Description

Technical Field

[0001] This utility model relates to the field of laser equipment control technology, and in particular to an extended conversion circuit for lasers. Background Technology

[0002] Laser welding and processing equipment typically consists of a control unit, a laser, and peripherals such as a galvanometer. In existing technical architectures, the laser controller and the laser head drive circuit are often connected directly or via a simple discrete component adapter board.

[0003] However, existing connection methods have several drawbacks: First, they lack compatibility, as fixed hardware wiring is difficult to adapt to the interface definitions of different manufacturers; second, their signal processing capabilities are insufficient, as general buffering schemes are prone to propagation delays and edge distortion when dealing with high-frequency signals above 20MHz, leading to galvanometer positioning errors and affecting processing accuracy; third, their anti-interference capabilities are weak, as simple connection circuits are insufficient to withstand power supply ripple and spatial radiation in complex industrial electromagnetic environments, easily causing signal errors and resulting in laser power fluctuations. Therefore, there is an urgent need for an extended conversion circuit capable of impedance matching, high-speed buffering, and anti-interference processing to meet the requirements of high-precision laser processing. Utility Model Content

[0004] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide an extended conversion circuit for lasers, which solves the problems of high signal delay, poor anti-interference ability and weak interface compatibility in the prior art through integrated impedance matching and high-speed buffer design.

[0005] This utility model discloses an extended conversion circuit for a laser, wherein the extended conversion circuit is connected between a laser controller and a laser head drive circuit to convert digital control signals into analog signals or drive signals, and the extended conversion circuit includes: An impedance matching unit, the input of which is connected to the output of the laser controller, is used to perform impedance matching on the received digital control signal; A buffer chip, the input terminal of which is connected to the output terminal of the impedance matching unit, is used to buffer and amplify the digital control signal after impedance matching. The output unit has its input terminal connected to the output terminal of the buffer chip and its output terminal connected to the laser head drive circuit, and is used for conditioning and outputting digital control signals.

[0006] In one or more embodiments of this utility model, the extended conversion circuit further includes an anti-interference unit, one end of which is connected to the input pin or output pin of the buffer chip, and the other end is grounded or connected to a power supply, for implementing pull-down or pull-up of the default level of the input and / or output signals.

[0007] In one or more embodiments of this utility model, the extended conversion circuit further includes a pin header connector, which is a 2*15P dual pin header connector with a 2.54mm pitch. The pin header connector is mounted on the circuit board and electrically connected to the buffer chip. The extended conversion circuit is connected in series between the laser controller and the laser head drive circuit through the pin header connector.

[0008] In one or more embodiments of this utility model, the buffer chip is an eight-channel tri-state buffer chip of model SN74ACT244DWR. The VCC pin of the buffer chip is connected to the power supply, and the VCC pin is also grounded through a decoupling capacitor.

[0009] In one or more embodiments of the present invention, the input terminal of the buffer chip includes a first input pin, a second input pin, a third input pin, a fourth input pin, a fifth input pin, a sixth input pin, a seventh input pin, and an eighth input pin; The impedance matching unit includes eight sets of buffer resistors. The first end of each buffer resistor is connected to the laser controller, and the second end is connected to the first to eighth input pins of the buffer chip, respectively.

[0010] In one or more embodiments of the present invention, the output terminal of the buffer chip includes a first output pin, a second output pin, a third output pin, a fourth output pin, a fifth output pin, a sixth output pin, a seventh output pin, and an eighth output pin; The output unit includes eight sets of output resistors. The first end of each output resistor is connected to the first to eighth output pins, and the second end of each resistor is connected to the laser head driving circuit.

[0011] In one or more embodiments of this utility model, the anti-interference unit includes several sets of pull-out resistors, the first end of each pull-out resistor is connected to the input or output end of the buffer chip, and the second end of each resistor is grounded.

[0012] In one or more embodiments of the present invention, the pin header connector integrates a power interface, which includes a 5V power pin for driving a buffer chip and a 3.3V power pin for adapting peripherals.

[0013] The beneficial effects of this utility model are: This invention uses the SN74ACT244DWR series high-speed buffer chip, which has extremely low propagation delay (usually less than 5ns), effectively solving the delay problem in high-frequency signal transmission and significantly improving the accuracy of galvanometer trajectory control.

[0014] This invention eliminates signal reflection and pulls floating signals to a stable level by combining an impedance matching resistor at the input end and an anti-interference unit including pull-up / pull-down resistors and decoupling capacitors, thereby significantly reducing the signal error rate in industrial environments.

[0015] In this invention, the buffer chip amplifies the power of the input signal, thereby enhancing the load driving capability of the subsequent laser head driving circuit.

[0016] This utility model adopts a standardized dual-row pin interface and a multi-voltage domain power supply design, which can be flexibly adapted to different types of lasers and peripherals, facilitating rapid integration and maintenance on the production line. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an extended conversion circuit board in one embodiment of the present invention; Figure 2 This is a circuit diagram of a double-row pin configuration in one embodiment of the present invention; Figure 3 This is a circuit diagram of a buffer chip in one embodiment of the present invention; Figure 4 This is a schematic diagram of the extended conversion circuit in one embodiment of the present invention. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0019] In the description of this utility model, it should be understood that the terms "vertical", "horizontal", "top", "bottom", "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] It should be noted that, unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0021] like Figures 1-4 As shown, this utility model provides an extended conversion circuit for a laser. The circuit board acts as an intermediate conversion module, connected in series between the laser controller and the laser head drive circuit. It functions to shape, amplify, and match the weak or easily interfered digital control signals emitted by the control host. These digital control signals can be PWM power adjustment signals, galvanometer pulse signals, etc.

[0022] In a further embodiment, the extended conversion circuit includes a buffer chip U1. In this embodiment, an eight-channel tri-state buffer chip of model SN74ACT244DWR is preferably used. This chip has high current drive capability and extremely short transmission delay (<5ns). In this embodiment, a TI ISO7240 digital isolation buffer chip can also be used.

[0023] In this embodiment, the output signal of the laser controller is transmitted through the input interface, corresponding to... Figure 2 The network input circuit, including pin header interfaces NET1~NET4, uses an impedance matching unit before the signal enters the buffer chip U1 to prevent waveform distortion caused by reflection of high-frequency signals in the transmission line. This impedance matching unit includes several buffer resistors: R1, R2, R3, R4, R5, R6, R7, and R8. One end of each resistor is connected to the controller's signal line, and the other end is connected to the input pins of the buffer chip U1, including pins 1A1, 1A2, 1A3, 1A4, 2A1, 2A2, 2A3, and 2A4. In this embodiment, the resistor value can be selected as 33Ω or 49Ω based on the characteristic impedance of the transmission line.

[0024] In a further embodiment, the power supply pin VCC of the buffer chip U1 is connected to the onboard VDD_5V0 power supply, and a 0.1μF decoupling capacitor C1 is connected in parallel to filter out power supply ripple. The chip internally buffers and amplifies the received TTL / CMOS level signals. Furthermore, an anti-interference unit is included in the circuit, mainly composed of several pull-up resistors (R51~R56, etc.). These resistors act as pull-down or pull-up resistors to ensure that the input / output terminals of the buffer chip remain at a defined level when the controller does not send a signal or the line is disconnected, preventing noise from being introduced by floating pins and causing accidental laser triggering.

[0025] In a further embodiment, the buffered and amplified signal is output from the chip's output pins, including a first output pin 1Y1, a second output pin 1Y2, a third output pin 1Y3, a fourth output pin 1Y4, a fifth output pin 2Y1, a sixth output pin 2Y2, a seventh output pin 2Y3, and an eighth output pin 2Y4. The output unit includes output resistors (R5~R8, R30~R33, etc.). After further conditioning by these resistors, the signal is transmitted to the laser head drive circuit for controlling the laser's power, switching the beam, or the galvanometer movement. In this embodiment, the first input pin 1A1, the second input pin 1A2, the third input pin 1A3, and the fourth input pin 1A4 correspond to the first output pin 1Y1, the second output pin 1Y2, the third output pin 1Y3, and the fourth output pin 1Y4; the fifth input pin 2A1, the sixth input pin 2A2, the seventh input pin 2A3, and the eighth input pin 2A4 correspond to the fifth output pin 2Y1, the sixth output pin 2Y2, the seventh output pin 2Y3, and the eighth output pin 2Y4.

[0026] In a further embodiment, such as Figure 2 As shown, this circuit connects to external devices via pin header connector H1. H1 uses a 2*15P dual-row pin header with a 2.54mm pitch. This interface not only transmits signals but also distributes the power network. Pin 29 is defined as VDD_5V0 to power the onboard logic devices; pin 26 is defined as DVD_3V3 to provide 3.3V power, adapting to laser peripherals with different voltage standards and achieving good compatibility.

[0027] In summary, this invention constructs a highly reliable signal transmission link through hardware-level impedance matching, high-speed buffering, and anti-interference design, effectively solving the common signal distortion and interference problems in laser equipment integration.

[0028] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. An extended conversion circuit for a laser, said extended conversion circuit being connected between a laser controller and a laser head drive circuit to convert digital control signals into analog signals or drive signals, characterized in that, The extended conversion circuit includes: An impedance matching unit, the input of which is connected to the output of the laser controller, is used to perform impedance matching on the received digital control signal; A buffer chip, the input terminal of which is connected to the output terminal of the impedance matching unit, is used to buffer and amplify the digital control signal after impedance matching. The output unit has its input terminal connected to the output terminal of the buffer chip and its output terminal connected to the laser head drive circuit, and is used for conditioning and outputting digital control signals.

2. The extended conversion circuit for a laser according to claim 1, characterized in that, The extended conversion circuit also includes an anti-interference unit. One end of the anti-interference unit is connected to the input or output pin of the buffer chip, and the other end is grounded or connected to the power supply, which is used to pull down or pull up the default level of the input and / or output signals.

3. The extended conversion circuit for a laser according to claim 1, characterized in that, The extended conversion circuit also includes a pin header connector, which is a 2*15P dual pin header connector with a 2.54mm pitch. The pin header connector is mounted on the circuit board and electrically connected to the buffer chip. The extended conversion circuit is connected in series between the laser controller and the laser head drive circuit through the pin header connector.

4. The extended conversion circuit for a laser according to claim 1, characterized in that, The buffer chip is an eight-channel tri-state buffer chip of model SN74ACT244DWR. The VCC pin of the buffer chip is connected to the power supply, and the VCC pin is also grounded through a decoupling capacitor.

5. An extended conversion circuit for a laser according to claim 4, characterized in that, The input terminals of the buffer chip include a first input pin, a second input pin, a third input pin, a fourth input pin, a fifth input pin, a sixth input pin, a seventh input pin, and an eighth input pin; The impedance matching unit includes eight sets of buffer resistors. The first end of each buffer resistor is connected to the laser controller, and the second end is connected to the first to eighth input pins of the buffer chip, respectively.

6. An extended conversion circuit for a laser according to claim 5, characterized in that, The output terminals of the buffer chip include a first output pin, a second output pin, a third output pin, a fourth output pin, a fifth output pin, a sixth output pin, a seventh output pin, and an eighth output pin; The output unit includes eight sets of output resistors. The first end of each output resistor is connected to the first to eighth output pins, and the second end of each resistor is connected to the laser head driving circuit.

7. An extended conversion circuit for a laser according to claim 2, characterized in that, The anti-interference unit includes several sets of pull-out resistors. The first end of each pull-out resistor is connected to the input or output end of the buffer chip, and the second end of each resistor is grounded.

8. An extended conversion circuit for a laser according to claim 3, characterized in that, The pin header connector integrates a power interface, which includes a 5V power pin for driving the buffer chip and a 3.3V power pin for adapting peripherals.

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