Protection circuit of laser control equipment port

Abstract

The utility model provides a protection circuit of a laser control equipment port, the laser control equipment comprises a first power supply, a second power supply, a first interface and a second interface, the first interface comprises a plurality of signal input ends, and the second interface comprises a data input end, a data output end, an enabling end and a clock signal end. The protection circuit comprises a power supply protection module, first interface protection modules and second interface protection modules, the number of the first interface protection modules and the number of the second interface protection modules are matched with the number of the signal input ends, the power supply protection module is connected with a first power supply, and each first interface protection module is connected with a second power supply, the power supply protection module and one signal input end. The first interface protection module is connected with first external equipment, the second interface protection module is respectively connected with the second power supply, the power supply protection module and the second interface, and the second interface protection module is connected with second external equipment. The protection circuit provided by the utility model can achieve the technical effect of improving the operation safety and stability of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a protection circuit for a port of a laser control device. Background Art

[0002] Currently, laser control equipment needs to be connected to other external devices. When an external device malfunctions, the operation of the laser control equipment will be damaged. Similarly, when an external device malfunctions, the operation of the external device will be damaged.

[0003] That is, how to provide a protection circuit, which is arranged between the laser control device and the external device, to achieve the technical effect of improving the safety and stability of the equipment operation is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] In view of the above-mentioned problems, the utility model aims to provide a protection circuit for a port of a laser control device, which at least solves at least one of the above-mentioned technical problems.

[0005] In order to at least solve the above technical problems, the utility model provides a protection circuit for a port of a laser control device, wherein the laser control device comprises a first power supply, a second power supply, a first interface and a second interface, wherein the first interface comprises a plurality of signal input terminals, and the second interface comprises a data input terminal, a data output terminal, an enable terminal and a clock signal terminal, wherein the protection circuit comprises:

[0006] A power supply protection module, wherein the power supply protection module is connected to the first power supply;

[0007] First interface protection modules adapted to the number of the signal input terminals, each of the first interface protection modules is respectively connected to the second power supply, the power supply protection module and one of the signal input terminals, and the first interface protection module is connected to a first external device;

[0008] A second interface protection module, wherein the second interface protection module is respectively connected to the second power supply, the power protection module, and the data input terminal, the data output terminal, the enable terminal, and the clock signal terminal of the second interface, and the second interface protection module is connected to a second external device.

[0009] Preferably, the power supply protection module includes:

[0010] A first TVS tube, one end of which is connected to the first power supply, and the other end of which is grounded;

[0011] a first magnetic bead, one end of which is connected to the first power source;

[0012] a first capacitor, one end of the first capacitor being connected to the other end of the first magnetic bead;

[0013] A first inductor, one end of the first inductor being connected to the other end of the first magnetic bead;

[0014] a second capacitor, one end of the second capacitor being connected to the other end of the first inductor;

[0015] A second magnetic bead, one end of the second magnetic bead is respectively connected to the other end of the first capacitor and the other end of the second capacitor, and the other end of the second magnetic bead is grounded;

[0016] A power isolation chip, the power isolation chip comprising an input pin, a ground pin, an output positive pin, and an output negative pin, the input pin is connected to the other end of the first inductor, the output negative pin is grounded, and the ground pin is connected to one end of the second magnetic bead;

[0017] A third capacitor, the third capacitor is connected between the ground pin and the output negative pin of the power isolation chip;

[0018] A first resistor, one end of the first resistor is connected to the output positive pin of the power isolation chip, and the other end of the first resistor is connected to the output negative pin of the power isolation chip;

[0019] a fourth capacitor, the fourth capacitor being connected in parallel with the first resistor;

[0020] a second TVS tube, wherein the second TVS tube is connected in parallel with the fourth capacitor;

[0021] a fuse, one end of which is connected to one end of the first resistor;

[0022] A third magnetic bead, one end of the third magnetic bead is connected to the other end of the fuse, and the other end of the third magnetic bead is respectively connected to the first interface protection module and the second interface protection module.

[0023] Preferably, the first interface protection module includes:

[0024] An optical coupler, wherein the positive electrode of the output terminal of the optical coupler is connected to one of the signal input terminals, the negative electrode of the output terminal of the optical coupler is grounded, the negative electrode of the input terminal of the optical coupler is grounded, and the positive electrode of the input terminal of the optical coupler is connected to a first external device;

[0025] a second resistor, one end of the second resistor being connected to the second power supply, and the other end of the second resistor being connected to the positive output terminal of the optocoupler;

[0026] A third resistor, one end of the third resistor is connected to the other end of the third magnetic bead, and the other end of the third resistor is connected to the positive input terminal of the optocoupler.

[0027] Preferably, the first interface protection module further includes:

[0028] A third TVS tube, the third TVS tube is connected between the positive output terminal and the negative output terminal of the optocoupler;

[0029] A fourth TVS tube, the fourth TVS tube is connected between the positive input terminal and the negative input terminal of the optocoupler;

[0030] A fifth capacitor is connected in parallel with the fourth TVS tube.

[0031] Preferably, the second interface protection module includes:

[0032] a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a sixth capacitor, a seventh capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a TYPE-C connector;

[0033] A digital isolation chip, wherein the third pin of the digital isolation chip is connected to the data input terminal through the fourth resistor, the fourth pin of the digital isolation chip is connected to the clock signal terminal through the fifth resistor, the fifth pin of the digital isolation chip is connected to the enable terminal through the sixth resistor, the sixth pin of the digital isolation chip is connected to the data output terminal through the seventh resistor, the first pin and the seventh pin of the digital isolation chip are both connected to the second power supply, the second pin and the eighth pin of the digital isolation chip are grounded, the ninth pin and the fifteenth pin of the digital isolation chip are grounded, and the tenth pin and the sixteenth pin of the digital isolation chip are both connected to the other end of the third magnetic bead;

[0034] A USB interface chip, wherein the first pin of the USB interface chip is connected to the other end of the third magnetic bead through an eighth resistor, the second pin of the USB interface chip is connected to the other end of the third magnetic bead through a sixth capacitor, the third pin and the tenth pin of the USB interface chip are grounded, the ninth resistor is connected between the second pin and the third pin of the USB interface chip, the seventh pin of the USB interface chip is grounded through the seventh capacitor, the thirteenth pin of the USB interface chip is connected to the twelfth pin of the digital isolation chip through the tenth resistor, the fourteenth pin of the USB interface chip is connected to the thirteenth pin of the digital isolation chip through the eleventh resistor, the fifteenth pin of the USB interface chip is connected to the fourteenth pin of the digital isolation chip through the twelfth resistor, the sixteenth pin of the USB interface chip is connected to the eleventh pin of the digital isolation chip through the thirteenth resistor, the twentieth pin of the USB interface chip is connected to the other end of the third magnetic bead, the eighth pin of the USB interface chip is connected to the TYPE-C connector through the fourteenth resistor, and the ninth pin of the USB interface chip is connected to the TYPE-C connector through the fifteenth resistor.

[0035] Preferably, the second interface protection module further includes:

[0036] an eighth capacitor connected between the first pin and the second pin of the digital isolation chip;

[0037] A ninth capacitor, wherein the ninth capacitor is connected between the fifteenth pin and the sixteenth pin of the digital isolation chip.

[0038] Preferably, the supply voltage of the first power supply is 5V.

[0039] Preferably, the supply voltage of the second power supply is 3.3V.

[0040] Preferably, the third capacitor C3 is a Y-type capacitor.

[0041] Preferably, the second interface protection module also includes a tenth capacitor, an eleventh capacitor, a fifth TVS tube, a sixth TVS tube and a seventh TVS tube, one end of the tenth capacitor is connected to the twentieth pin of the USB interface chip, and the other end of the tenth capacitor is grounded; the eleventh capacitor is connected in parallel with the tenth capacitor; the fifth TVS tube is connected in parallel with the eleventh capacitor, one end of the sixth TVS tube is connected to an end of the fourteenth resistor away from the USB interface chip, the other end of the sixth TVS tube is grounded, one end of the seventh TVS tube is connected to an end of the fifteenth resistor away from the USB interface chip, and the other end of the seventh TVS tube is grounded.

[0042] Beneficial effects:

[0043] The utility model provides a protection circuit for a port of a laser control device, wherein the laser control device comprises a first power supply, a second power supply, a first interface and a second interface, the first interface comprises a plurality of signal input terminals, the second interface comprises a data input terminal, a data output terminal, an enable terminal and a clock signal terminal, the protection circuit comprises a power supply protection module, a first interface protection module and a second interface protection module adapted to the number of the signal input terminals, the power supply protection module is connected to the first power supply, each first interface protection module is respectively connected to the second power supply, the power supply protection module and a signal input terminal, the first interface protection module is connected to the first external device; the second interface protection module is respectively connected to the second power supply, the power supply protection module and the data input terminal, the data output terminal, the enable terminal and the clock signal terminal of the second interface, the second interface protection module is connected to the second external device, so that the laser control device is connected to the first external device through the first interface protection module, and the laser control device is connected to the second external device through the second interface protection module, so as to realize electrical isolation of the laser control device, and the isolation can protect personnel and equipment from being harmed by electrical faults, and can also ensure the reliability and stability of the electrical system, so as to achieve the technical effect of improving the safety and stability of equipment operation.

[0044] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A schematic diagram of circuit connection of the power protection module provided in Example 1;

[0047] Figure 2 A schematic diagram of circuit connections of the first interface protection module provided in Example 1;

[0048] Figure 3 A schematic diagram of the circuit connection of the digital isolation chip in the second interface protection module provided in Example 1;

[0049] Figure 4A schematic diagram of the circuit connection of the USB interface chip in the second interface protection module provided in Example 1;

[0050] Figure 5 This is a schematic diagram of the circuit connection of the TYPE-C connector in the second interface protection module provided in Example 1. DETAILED DESCRIPTION

[0051] The following will combine the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this utility model; the "and / or" keyword involved in this implementation represents both and, or. In other words, A and / or B mentioned in the embodiments of this specification represent both A and B, and A or B, and describe the three states of A and B. For example, A and / or B means: only A is included but not B; only B is included but not A; A and B are included.

[0052] Meanwhile, in the embodiments of this specification, when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time.

[0053] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0054] Embodiment 1

[0055] See also Figure 1-5, this embodiment 1 provides a protection circuit for a port of a laser control device, the laser control device includes a first power supply, a second power supply, a first interface and a second interface, the first interface includes a plurality of signal input terminals, the second interface includes a data input terminal, a data output terminal, an enable terminal and a clock signal terminal, characterized in that the protection circuit includes a power supply protection module, a first interface protection module adapted to the number of the signal input terminals, and a second interface protection module, the power supply protection module is connected to the first power supply; each of the first interface protection modules is respectively connected to the second power supply, the power supply protection module and one of the signal input terminals, the first interface protection module is connected to a first external device; the second interface protection module is respectively connected to the second power supply, the power supply protection module and the data input terminal, the data output terminal, the enable terminal and the clock signal terminal of the second interface, and the second interface protection module is connected to a second external device.

[0056] The embodiment of the utility model provides a protection circuit for a port of a laser control device, wherein the laser control device comprises a first power supply, a second power supply, a first interface and a second interface, the first interface comprises a plurality of signal input terminals, the second interface comprises a data input terminal, a data output terminal, an enable terminal and a clock signal terminal, the protection circuit comprises a power supply protection module, a first interface protection module and a second interface protection module adapted to the number of the signal input terminals, the power supply protection module is connected to the first power supply, each first interface protection module is respectively connected to the second power supply, the power supply protection module and a signal input terminal, the first interface protection module is connected to the first external device; the second interface protection module is respectively connected to the second power supply, the power supply protection module and the data input terminal, the data output terminal, the enable terminal and the clock signal terminal of the second interface, the second interface protection module is connected to the second external device, so that the laser control device is connected to the first external device through the first interface protection module, and the laser control device is connected to the second external device through the second interface protection module, so as to realize electrical isolation of the laser control device, and the isolation can protect personnel and equipment from harm caused by electrical faults, and can also ensure the reliability and stability of the electrical system, so as to achieve the technical effect of improving the safety and stability of equipment operation.

[0057] Specifically, the first power source of the laser control device (such as Figure 1 The +5V_IN terminal in the figure is shown) and then electrically isolated by the power isolation chip U1 to power the input terminal of the optocoupler U2, the digital isolation chip U3, and the USB interface chip U4. The second power supply of the laser control device (as shown in Figure 2 The +3.3V_D terminal (as shown in the figure) is used to power the output terminal of the optocoupler U2, and the electrical isolation between the second power supply of the laser control device and the external device is achieved through the optocoupler U2.

[0058] In a possible implementation manner, the supply voltage of the first power supply is 5V.

[0059] In a possible implementation manner, a supply voltage of the second power supply is 3.3V.

[0060] In a possible implementation, Figure 1 As shown, the power protection module includes a first TVS tube D1, a first magnetic bead BR1, a first capacitor C1, a first inductor L1, a second capacitor C2, a second magnetic bead BR2, a power isolation chip U1, a third capacitor C3, a first resistor R1, a fourth capacitor C4, a second TVS tube D2, a fuse F1, and a third magnetic bead BR3. One end of the first TVS tube D1 is connected to the first power supply, and the other end of the first TVS tube D1 is grounded; one end of the first magnetic bead BR1 is connected to the first power supply; one end of the first capacitor C1 is connected to the other end of the first magnetic bead BR1; one end of the first inductor L1 is connected to the other end of the first magnetic bead BR1; one end of the second capacitor C2 is connected to the other end of the first inductor L1; one end of the second magnetic bead BR2 is respectively connected to the other end of the first capacitor C1 and the other end of the second capacitor C2, and the other end of the second magnetic bead BR2 is grounded; the power isolation chip U1 is connected to the first power supply; one end of the first magnetic bead BR1 is ... magnetic bead BR1; one end of the first inductor L1 is connected to the other end of the first magnetic bead BR1; one end of the second capacitor C2 is connected to the other end of the first inductor L1; one end of the second magnetic bead BR2 is respectively connected to the other end of the first capacitor C1 and the other end of the second capacitor C2, and the other end of the second magnetic bead BR2 is grounded; the power isolation chip U1 is connected to the first power supply; one end of the first magnetic bead BR 1 includes an input pin, a ground pin, an output positive pin, and an output negative pin, the input pin is connected to the other end of the first inductor L1, the output negative pin is grounded, and the ground pin is connected to one end of the second magnetic bead BR2; the third capacitor C3 is connected between the ground pin and the output negative pin of the power isolation chip U1; one end of the first resistor R1 is connected to the output positive pin of the power isolation chip U1, and the other end of the first resistor R1 is connected to the output negative pin of the power isolation chip U1; the fourth capacitor C4 is connected in parallel with the first resistor R1; the second TVS tube D2 is connected in parallel with the fourth capacitor C4; one end of the fuse F1 is connected to one end of the first resistor R1; one end of the third magnetic bead BR3 is connected to the other end of the fuse F1, and the other end of the third magnetic bead BR3 is respectively connected to the first interface protection module and the second interface protection module.

[0061] Among them, the first capacitor C1, the first inductor L1, and the second capacitor C2 form an LC oscillation circuit to achieve the technical effects of filtering and anti-interference through the LC oscillation circuit. The first TVS tube D1 and the second TVS tube D2 are set to protect the circuit from damage caused by instantaneous high-energy impact and ensure that sensitive components in the circuit are not damaged by overvoltage or current through functions such as fast response and high energy absorption. The first magnetic bead BR1, the second magnetic bead BR2 and the third magnetic bead BR3 are set to filter out unnecessary high-frequency signals in the circuit to ensure signal clarity and accuracy, thereby improving overall performance and reliability; the power isolation chip U1 is a DC to DC isolation chip, whose main function is to convert the input DC voltage into a DC output voltage of the same or different levels, and ensure electrical isolation between the input and output. This isolation can prevent noise and surge current at the input end from affecting the output end, which is crucial for protecting sensitive equipment and improving system safety.

[0062] In a possible implementation, Figure 2 As shown, the first interface protection module includes an optocoupler U2, a second resistor R2 and a third resistor R3, the positive electrode of the output end of the optocoupler U2 is connected to one of the signal input ends, the negative electrode of the output end of the optocoupler U2 is grounded, the negative electrode of the input end of the optocoupler U2 is grounded, and the positive electrode of the input end of the optocoupler U2 is connected to the first external device; one end of the second resistor R2 is connected to the second power supply, and the other end of the second resistor R2 is connected to the positive electrode of the output end of the optocoupler U2; one end of the third resistor R3 is connected to the other end of the third magnetic bead BR3, and the other end of the third resistor R3 is connected to the positive electrode of the input end of the optocoupler U2;

[0063] In actual use, the first external device can be a foot switch. Specifically, the positive pole of the output end of the optocoupler U2 can be connected to the corresponding signal input end in the laser control device for starting laser emission, and the positive pole of the input end of the optocoupler U2 can be connected to the external foot switch through a connector to start and stop the laser emission by the foot switch; the positive pole of the output end of the optocoupler U2 can also be connected to the signal input end of the corresponding safety interlock device in the laser control device, and the positive pole of the input end of the optocoupler U2 can be connected to an audio connector to realize the status detection of the safety interlock device through the audio connector.

[0064] In a possible implementation, the first interface protection module further includes a third TVS tube D3, a fourth TVS tube D4 and a fifth capacitor C5, the third TVS tube D3 is connected between the positive output terminal and the negative output terminal of the optocoupler U2; the fourth TVS tube D4 is connected between the positive input terminal and the negative input terminal of the optocoupler U2; the fifth capacitor C5 is connected in parallel with the fourth TVS tube D4 to achieve the technical effect of filtering and eliminating interference.

[0065] In a possible implementation, Figure 3-5 As shown, the second interface protection module includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a sixth capacitor C6, a seventh capacitor C7, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a TYPE-C connector, a digital isolation chip U3 and a USB interface chip U4; the third pin of the digital isolation chip U3 is connected to the data input end through the fourth resistor R4, the fourth pin of the digital isolation chip U3 is connected to the clock signal end through the fifth resistor R5, and the digital isolation chip U3 is connected to the clock signal end through the fifth resistor R5. The fifth pin of the chip U3 is connected to the enable end through the sixth resistor R6, the sixth pin of the digital isolation chip U3 is connected to the data output end through the seventh resistor R7, the first pin and the seventh pin of the digital isolation chip U3 are both connected to the second power supply, the second pin and the eighth pin of the digital isolation chip U3 are grounded, the ninth pin and the fifteenth pin of the digital isolation chip U3 are grounded, and the tenth pin and the sixteenth pin of the digital isolation chip U3 are both connected to the other end of the third magnetic bead BR3; the first pin of the USB interface chip U4 is connected to the other end of the third magnetic bead BR3 through the eighth resistor R8, and the USB interface chip U4 The twentieth pin of the USB interface chip U4 is connected to the other end of the third magnetic bead BR3, the second pin of the USB interface chip U4 is connected to the other end of the third magnetic bead BR3 through the sixth capacitor C6, the third pin and the tenth pin of the USB interface chip U4 are grounded, the ninth resistor R9 is connected between the second pin and the third pin of the USB interface chip U4, the seventh pin of the USB interface chip U4 is grounded through the seventh capacitor C7, the thirteenth pin of the USB interface chip U4 is connected to the twelfth pin of the digital isolation chip U3 through the tenth resistor R10, and the fourteenth pin of the USB interface chip U4 is connected to the digital isolation chip U3 through the eleventh resistor R11. The thirteenth pin of the USB interface chip U3 is connected, the fifteenth pin of the USB interface chip U4 is connected to the fourteenth pin of the digital isolation chip U3 through the twelfth resistor R12, the sixteenth pin of the USB interface chip U4 is connected to the eleventh pin of the digital isolation chip U3 through the thirteenth resistor R13, the twentieth pin of the USB interface chip U4 is connected to the other end of the third magnetic bead BR3, the eighth pin of the USB interface chip U4 is connected to the TYPE-C connector through the fourteenth resistor R14, and the ninth pin of the USB interface chip U4 is connected to the TYPE-C connector through the fifteenth resistor R15.

[0066] Specifically, the TYPE-C connector transmits a differential signal, which is converted into an SPI signal readable by the laser control device through the USB interface chip U4, and then the USB interface chip U4 and the second interface of the laser control device are connected through the digital isolation chip U3 to achieve electrical isolation between the laser control device and the second external device, wherein the second external device is connected to the TYPE-C connector, and the second external device can be a U disk with a TYPE-C interface, thereby realizing the reading of data stored in the U disk.

[0067] In a possible implementation, the second interface protection module further includes a crystal oscillator X1, a twelfth capacitor C12 and a thirteenth capacitor C13, wherein the crystal oscillator X1 is connected between the eleventh pin and the twelfth pin of the USB interface chip U4, and one end of the crystal oscillator X1 is grounded through the twelfth capacitor C12, and the other end of the crystal oscillator X1 is grounded through the thirteenth capacitor C13. By arranging the crystal oscillator X1 on the USB interface chip U4, since the crystal oscillator X1 can generate very accurate electrical signals (these signals are used as clock sources in electronic systems) at its inherent mechanical resonance frequency, a stable clock frequency is provided for the USB interface chip U4. And by connecting grounded capacitors at both ends of the crystal oscillator, the oscillation frequency can be stabilized and high-frequency interference can be filtered.

[0068] In a possible implementation, the second interface protection module also includes an eighth capacitor C8 and a ninth capacitor C9, the eighth capacitor C8 is connected between the first pin and the second pin of the digital isolation chip U3; the ninth capacitor C9 is connected between the fifteenth pin and the sixteenth pin of the digital isolation chip U3, so that the eighth capacitor C8 and the ninth capacitor C9 constitute a grounding capacitor, which can ensure the stability of the circuit while reducing electromagnetic interference, thereby improving the overall performance and reliability of the system.

[0069] In a possible implementation, the third capacitor C3 is a Y-type capacitor, which is usually made of high-voltage ceramic and is mainly used to suppress common-mode interference and can also filter out high-order harmonics and improve output voltage quality.

[0070] In a possible implementation, the second interface protection module further includes a tenth capacitor C10, an eleventh capacitor C11, a fifth TVS tube D5, a sixth TVS tube D6 and a seventh TVS tube D7, one end of the tenth capacitor C10 is connected to the twentieth pin of the USB interface chip, and the other end of the tenth capacitor C10 is grounded; the eleventh capacitor C11 is connected in parallel with the tenth capacitor C10; the fifth TVS tube D5 is connected in parallel with the eleventh capacitor C11, one end of the sixth TVS tube D6 is connected to the end of the fourteenth resistor R14 away from the USB interface chip U4, the other end of the sixth TVS tube D6 is grounded, one end of the seventh TVS tube D7 is connected to the end of the fifteenth resistor R15 away from the USB interface chip U4, and the other end of the seventh TVS tube D7 is grounded. Specifically, the fifth TVS tube D5, the sixth TVS tube D6 and the seventh TVS tube D7 are used to further protect the laser control device, and the tenth capacitor C10 and the eleventh capacitor C11 are used to realize the power supply voltage (such as Figure 1 and Figure 4 The VDD_USB terminal in the circuit is filtered.

[0071] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of the present specification are only used to match the contents disclosed in the specification for people familiar with the technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present utility model, should still fall within the scope of the technical contents disclosed by the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in the present specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present utility model. The change or adjustment of the relative relationship, without substantial change of the technical contents, should also be regarded as the scope of the implementation of the present utility model.

[0072] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A protection circuit for a port of a laser control device, the laser control device comprising a first power supply, a second power supply, a first interface and a second interface, the first interface comprising a plurality of signal input terminals, the second interface comprising a data input terminal, a data output terminal, an enable terminal and a clock signal terminal, characterized in that: The protection circuit comprises: A power supply protection module, wherein the power supply protection module is connected to the first power supply; First interface protection modules adapted to the number of the signal input terminals, each of the first interface protection modules is respectively connected to the second power supply, the power supply protection module and one of the signal input terminals, and the first interface protection module is connected to a first external device; A second interface protection module, wherein the second interface protection module is respectively connected to the second power supply, the power protection module, and the data input terminal, the data output terminal, the enable terminal, and the clock signal terminal of the second interface, and the second interface protection module is connected to a second external device.

2. The protection circuit of the laser control device port according to claim 1, characterized in that: The power protection module comprises: A first TVS tube, one end of which is connected to the first power supply, and the other end of which is grounded; a first magnetic bead, one end of which is connected to the first power source; A first capacitor, one end of the first capacitor being connected to the other end of the first magnetic bead; A first inductor, one end of the first inductor being connected to the other end of the first magnetic bead; a second capacitor, one end of the second capacitor being connected to the other end of the first inductor; A second magnetic bead, one end of the second magnetic bead is respectively connected to the other end of the first capacitor and the other end of the second capacitor, and the other end of the second magnetic bead is grounded; A power isolation chip, the power isolation chip comprising an input pin, a ground pin, an output positive pin, and an output negative pin, the input pin is connected to the other end of the first inductor, the output negative pin is grounded, and the ground pin is connected to one end of the second magnetic bead; A third capacitor, the third capacitor is connected between the ground pin and the output negative pin of the power isolation chip; A first resistor, one end of the first resistor is connected to the output positive pin of the power isolation chip, and the other end of the first resistor is connected to the output negative pin of the power isolation chip; a fourth capacitor, the fourth capacitor being connected in parallel with the first resistor; a second TVS tube, wherein the second TVS tube is connected in parallel with the fourth capacitor; a fuse, one end of which is connected to one end of the first resistor; A third magnetic bead, one end of the third magnetic bead is connected to the other end of the fuse, and the other end of the third magnetic bead is respectively connected to the first interface protection module and the second interface protection module.

3. The protection circuit of the laser control device port as claimed in claim 2, characterized in that: The first interface protection module includes: An optical coupler, wherein the positive electrode of the output terminal of the optical coupler is connected to one of the signal input terminals, the negative electrode of the output terminal of the optical coupler is grounded, the negative electrode of the input terminal of the optical coupler is grounded, and the positive electrode of the input terminal of the optical coupler is connected to a first external device; a second resistor, one end of the second resistor being connected to the second power supply, and the other end of the second resistor being connected to the positive output terminal of the optocoupler; A third resistor, one end of the third resistor is connected to the other end of the third magnetic bead, and the other end of the third resistor is connected to the positive input terminal of the optocoupler.

4. The protection circuit of the laser control device port as claimed in claim 3, characterized in that: The first interface protection module also includes: A third TVS tube, the third TVS tube is connected between the positive output terminal and the negative output terminal of the optocoupler; A fourth TVS tube, the fourth TVS tube is connected between the positive input terminal and the negative input terminal of the optocoupler; A fifth capacitor is connected in parallel with the fourth TVS tube.

5. The protection circuit for the laser control device port as claimed in claim 4, characterized in that: The second interface protection module includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a sixth capacitor, a seventh capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a TYPE-C connector; A digital isolation chip, wherein the third pin of the digital isolation chip is connected to the data input terminal through the fourth resistor, the fourth pin of the digital isolation chip is connected to the clock signal terminal through the fifth resistor, the fifth pin of the digital isolation chip is connected to the enable terminal through the sixth resistor, the sixth pin of the digital isolation chip is connected to the data output terminal through the seventh resistor, the first pin and the seventh pin of the digital isolation chip are both connected to the second power supply, the second pin and the eighth pin of the digital isolation chip are grounded, the ninth pin and the fifteenth pin of the digital isolation chip are grounded, and the tenth pin and the sixteenth pin of the digital isolation chip are both connected to the other end of the third magnetic bead; A USB interface chip, wherein the first pin of the USB interface chip is connected to the other end of the third magnetic bead through an eighth resistor, the second pin of the USB interface chip is connected to the other end of the third magnetic bead through a sixth capacitor, the third pin and the tenth pin of the USB interface chip are grounded, the ninth resistor is connected between the second pin and the third pin of the USB interface chip, the seventh pin of the USB interface chip is grounded through the seventh capacitor, the thirteenth pin of the USB interface chip is connected to the twelfth pin of the digital isolation chip through the tenth resistor, the fourteenth pin of the USB interface chip is connected to the thirteenth pin of the digital isolation chip through the eleventh resistor, the fifteenth pin of the USB interface chip is connected to the fourteenth pin of the digital isolation chip through the twelfth resistor, the sixteenth pin of the USB interface chip is connected to the eleventh pin of the digital isolation chip through the thirteenth resistor, the twentieth pin of the USB interface chip is connected to the other end of the third magnetic bead, the eighth pin of the USB interface chip is connected to the TYPE-C connector through the fourteenth resistor, and the ninth pin of the USB interface chip is connected to the TYPE-C connector through the fifteenth resistor.

6. The protection circuit for the laser control device port as claimed in claim 5, characterized in that: The second interface protection module also includes: an eighth capacitor connected between the first pin and the second pin of the digital isolation chip; A ninth capacitor, wherein the ninth capacitor is connected between the fifteenth pin and the sixteenth pin of the digital isolation chip.

7. The protection circuit for the laser control device port as claimed in claim 6, characterized in that: The supply voltage of the first power supply is 5V.

8. The protection circuit for the laser control device port as claimed in claim 7, characterized in that: The supply voltage of the second power supply is 3.3V.

9. The protection circuit for the laser control device port as claimed in claim 8, characterized in that: The third capacitor is a Y-type capacitor.

10. The protection circuit for the laser control device port as claimed in claim 9, characterized in that The second interface protection module further includes a tenth capacitor, an eleventh capacitor, a fifth TVS tube, a sixth TVS tube and a seventh TVS tube, one end of the tenth capacitor is connected to the twentieth pin of the USB interface chip, and the other end of the tenth capacitor is grounded; the eleventh capacitor is connected in parallel with the tenth capacitor; The fifth TVS tube is connected in parallel with the eleventh capacitor, one end of the sixth TVS tube is connected to an end of the fourteenth resistor away from the USB interface chip, and the other end of the sixth TVS tube is grounded, one end of the seventh TVS tube is connected to an end of the fifteenth resistor away from the USB interface chip, and the other end of the seventh TVS tube is grounded.

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