Anti-jamming adapter card

Abstract

The embodiment of the present application discloses a kind of anti-signal interference adapter, it includes: input interface;At least one EMI filter module, the EMI filter module is connected with the input interface, and is used to eliminate common-mode interference;At least one input-output module, the input-output module is connected with the EMI filter module, and is used to convert input interference signal into digital signal, while for stabilizing output signal;Voltage rise and fall module, the voltage rise and fall module is connected with the input interface, and is used to stabilize output power supply;At least one output interface, the output interface is connected with the input-output module.The present application not only can completely eliminate the problem of existing control signal interference, but also when a controller controls multiple lasers simultaneously, using the adapter provided by the present application, multiple devices can be synchronized to work, greatly improving the ability of coordinated action.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, and particularly relates to a signal interference prevention switching card. BACKGROUND

[0002] With the development of science and technology, the laser is more applied to the automatic assembly line, the working environment of the laser is more and more complex, the communication environment of the laser and the control master station is more and more poor, and the transmission signal between the laser and the master station is more and more unstable due to the interference.

[0003] At present, the laser is directly connected with the marking card for communication by using a 25PIN 3m or longer parallel port line, the signal transmitted in the parallel port line is a 5V or 3.3V single side signal, the marking card uses a communication card expanded by a PC, but the 25PIN parallel port line used does not have a shielding layer, and the transmitted single side signal is interfered by electromagnetic interference, so that the induced voltage of the 5V or 3.3V level changes, especially when the dry contact is used, the induced voltage continuously changes, so that the laser cannot correctly identify the signal.

[0004] Meanwhile, the 25PIN of the pulse laser has a transmission frequency signal, the 19th pin transmits a 1KHz-10MHz square wave signal, and the transmission line can increase a magnetic ring to reduce the interference when transmitting the signal, but the multiple magnetic rings cannot eliminate the influence of the external interference when the square wave signal is transmitted at a high frequency, especially in the MHz segment, so that the signal has problems such as frequency jitter and pulse jump.

[0005] In addition, in the synchronous work, multiple lasers are simultaneously controlled by a marking card to perform repeated work, due to the simultaneous work of the multiple lasers, the load capacity of the marking card is limited, so that the line drop, dead machine and other situations occur continuously. SUMMARY

[0006] In view of the defects in the prior art, the present application provides a signal interference prevention switching card, which aims to solve the technical problem that the laser and the master station cannot stably communicate in the prior art.

[0007] To solve the above problems, the present application provides a signal interference prevention switching card, which comprises:

[0008] an input interface;

[0009] at least one EMI filtering module, which is connected with the input interface and is used for eliminating common mode interference;

[0010] At least one input-output module, which is connected with the EMI filter module and is used for converting the input interference signal into digital signal and stabilizing the output signal;

[0011] A voltage lifting module, which is connected with the input interface and is used for stabilizing the output power supply;

[0012] At least one output interface, which is connected with the input-output module.

[0013] Preferably, in the anti-interference signal adapter, the pins of the input interface are individually connected with the EMI filter modules, and the pins of the output interface are individually connected with the input-output modules.

[0014] Preferably, in the anti-interference signal adapter, the EMI filter module is individually connected with the input-output module.

[0015] Preferably, in the anti-interference signal adapter, the EMI filter module comprises a common-mode inductor and an RC circuit; one end of the first coil of the common-mode inductor is connected with a pin of the input interface, the other end is connected with the input-output module, both ends of the second coil of the common-mode inductor are grounded, one end of the RC circuit is connected with the input-output module, and the other end is grounded.

[0016] More preferably, in the anti-interference signal adapter, the RC circuit is a parallel RC circuit, one end of the parallel RC circuit is connected with the conversion module, and the other end is grounded.

[0017] Preferably, in the anti-interference signal adapter, the input-output module is provided with a level selection circuit, the level selection circuit is connected with a reference voltage, and the switching of the reference voltage is realized.

[0018] More preferably, in the anti-interference signal adapter, the level selection circuit is provided with a single-pole multi-throw switch, the power input end of the single-pole multi-throw switch is connected with a power supply end, and the multiple power output ends are individually connected with the reference voltage through a resistor and grounded.

[0019] Preferably, in the anti-interference signal adapter, the input-output module comprises a first voltage comparator and a first voltage follower; the non-inverting input end of the first voltage comparator is connected with a pin of the input interface through the EMI filter module, the inverting input end is connected with a reference voltage, and the output end is connected with the base of the first voltage follower; the emitter and collector of the first voltage follower are connected with the same pin of the output interface.

[0020] Preferably, in the anti-signal interference adapter card, the input-output module comprises a second voltage comparator and a second voltage follower; wherein the emitter and the collector of the second voltage follower are connected with the same pin of the input interface through the EMI filter module, the base is connected with the output end of the second voltage comparator; the non-inverting input end of the second voltage comparator is connected with a reference voltage, and the inverting input end is connected with a pin of the output interface.

[0021] Preferably, in the anti-signal interference adapter card, the voltage lifting module comprises a control chip and a controllable switch; wherein one end of the control chip is connected with the input interface, and the other end is connected with a power supply end, the control chip is used for realizing voltage reduction; one end of the controllable switch is connected with the input interface, and the other end is connected with a power supply end, the controllable switch is used for realizing voltage lifting.

[0022] The embodiment of the present application provides an anti-signal interference adapter card, at least one EMI filter module is electrically connected between the input interface and the output interface to eliminate common-mode interference, at least one input-output module is electrically connected between the EMI filter module and the output interface to convert the interference signal into a digital signal, and the output interface is enabled to stably output a signal. In addition, a voltage lifting module is electrically connected to the input interface to enable the output power supply to remain stable. The present application can completely eliminate the problem of existing control signal interference, and when one controller controls multiple lasers, the adapter card provided by the present application can enable multiple devices to work synchronously, greatly improving the ability of cooperative action. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A simple schematic diagram of the anti-signal interference adapter card provided by the embodiment of the present application;

[0025] Figure 2 A simple schematic diagram of the input interface provided by the embodiment of the present application;

[0026] Figure 3 A simple schematic diagram of the output interface provided by the embodiment of the present application;

[0027] Figure 4 A simple schematic diagram of the EMI filter module provided by the embodiment of the present application;

[0028] Figure 5 Another simple schematic diagram of the EMI filter module provided by the embodiment of the present application;

[0029] Figure 6 A simple schematic diagram of the level selection circuit provided by the embodiment of the present application;

[0030] Figure 7 A simple schematic diagram of the input / output module provided by the embodiment of the present application;

[0031] Figure 8 Another simple schematic diagram of the input / output module provided by the embodiment of the present application;

[0032] Figure 9 Another simple schematic diagram of the input / output module provided by the embodiment of the present application;

[0033] Figure 10 Another simple schematic diagram of the input / output module provided by the embodiment of the present application;

[0034] Figure 11 Another simple schematic diagram of the input / output module provided by the embodiment of the present application;

[0035] Figure 12 Another simple schematic diagram of the input / output module provided by the embodiment of the present application;

[0036] Figure 13 Another simple schematic diagram of the input / output module provided by the embodiment of the present application;

[0037] Figure 14 Another simple schematic diagram of the input / output module provided by the embodiment of the present application;

[0038] Figure 15 A simple schematic diagram of the voltage lifting module provided by the embodiment of the present application;

[0039] Figure 16 An effect diagram of completing marking by using the anti-signal interference adapter provided by the embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0041] It should be understood that the terms "comprise" and "comprising" when used in this specification and accompanying claims, signify the presence of the stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0042] It should also be understood that the terms used in the present specification and claims are for the purpose of describing particular embodiments and do not intend to limit the present application. As used in the present specification and claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] It should further be understood that the term "and / or" used in the present specification and claims means one or more of the associated listed items as well as all possible combinations of the items and includes the combinations.

[0044] Please refer to Figure 1 , Figure 1 The simple schematic diagram of the anti-signal interference adapter card provided for the embodiments of the present application is shown in the figure. Figure 1 As shown in the figure, an anti-signal interference adapter card comprises:

[0045] an input interface 10;

[0046] at least one EMI (Electromagnetic Interference) filter module 20, which is connected with the input interface 10 and is used for eliminating common mode interference;

[0047] at least one input / output module 30, which is connected with the EMI filter module 20 and is used for converting the input interference signal into a digital signal and stabilizing the output signal;

[0048] a voltage rising and falling module 40, which is connected with the input interface 10 and is used for stabilizing the output power supply;

[0049] at least one output interface 50, which is connected with the input / output module 30.

[0050] The signal interference prevention adapter provided by the embodiment of the present application can eliminate common mode interference by electrically connecting at least one EMI filter module 20 between the input interface 10 and the output interface 50, and can convert interference signals into digital signals and stabilize the output signal of the output interface 50 by electrically connecting at least one input / output module 30 between the EMI filter module 20 and the output interface 50. In addition, a voltage rise and fall module 40 is electrically connected to the input interface 10 to keep the output power stable. The present application can not only completely eliminate the problem of existing control signal interference, but also can make multiple devices work synchronously when one controller controls multiple lasers, greatly improving the ability of cooperative action.

[0051] The input interface 10 is the signal adapter of the upper computer, and the output interface 50 is the signal adapter of the lower computer, that is, the signal is input into the input interface 10 through the upper computer, output from the input interface 10 to the output interface 50, and input into the lower computer through the output interface 50. The input interface 10 and the output interface 50 can be any one of a DB25 male seat interface, a USB interface, a Type-C interface, a VGA interface, an HDMI interface, and a DVI interface, which can be selected according to actual application, and is not specifically limited in the present application.

[0052] In some embodiments, as shown in Figure 2 and Figure 3 The input interface 10 and the output interface 50 are preferably DB25 male seat interfaces. The DB25 male seat interface in the embodiment includes 25 pins, and the signals transmitted by the DB25 male seat interface include power, single side, and frequency signals. The functions and descriptions of each pin can be referred to Table 1.

[0053] Table 1

[0054]

[0055] It can be understood that the signal interference prevention adapter provided by the present application can only have one EMI filter module 20, one input / output module 30, and one output interface 50, or can have multiple EMI filter modules 20, multiple input / output modules 30, and multiple output interfaces 50. When there is only one EMI filter module 20, one input / output module 30, and one output interface 50, all pins of the input interface 10 can be electrically connected to the EMI filter module 20, and all pins of the output interface 50 can be electrically connected to the input / output module 30. In addition, the signal interference prevention adapter can also have one output interface 50, or multiple output interfaces 50, which can realize synchronous work of multiple devices.

[0056] In some embodiments, the plurality of pins of the input interface 10 are individually connected to a respective EMI filter module 20, and the plurality of pins of the output interface 50 are individually connected to a respective input / output module 30, and one EMI filter module 20 is connected to one input / output module 30.

[0057] When the external electromagnetic field induces a voltage on all the conductors in the circuit traces, the voltage will generate a common-mode interference current, where the voltage is equal in amplitude and in phase with respect to the ground. At the same time, due to the different ground potentials of the devices at both ends of the circuit traces, a common-mode interference current will also be generated under the driving of the ground potential difference. In addition, there is a potential difference between the circuit traces of the device and the ground, and a common-mode interference current will also be generated on the circuit traces.

[0058] It can be understood that if the device generates a common-mode interference current on its circuit traces, the circuit traces will generate strong electromagnetic radiation, which will cause electromagnetic interference to the electronic and electrical product components and affect the performance indicators of the product. In addition, when the circuit is unbalanced, the common-mode interference current will be converted into a differential-mode interference current, which will directly interfere with the circuit. For the signal lines and their loops in the circuit of the electronic and electrical product, the differential-mode loop is equivalent to a small loop antenna, which can radiate a magnetic field to the space or receive a magnetic field.

[0059] In addition, the common mode interference signal is mainly concentrated above 1MHz, and since the common mode interference is induced on the cable through space, the induction is only easy to occur at a higher frequency. Since the input interface 10 in the embodiment adopts a DB25 male interface, the pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 16, 18, 19, 21, 22, 23 of the DB25 male interface transmit the same signal, i.e. a single side signal, and the pin 20 transmits a frequency signal, both the single side signal and the frequency signal being transmitted through a parallel port line. Meanwhile, the application takes the GND as a reference plane, and the GND plane is also electrically connected to the two reference planes through the pins 10 and 14, thus common mode interference exists. In addition, the communication signal of the pin 20 is near the alternating speed of 1MHz, thus the pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 16, 18, 19, 20, 21, 22, 23 of the input interface 10 adopting the DB25 male interface are separately connected to an EMI filter module 20, and the pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 16, 18, 19, 20, 21, 22, 23 of the output interface 50 adopting the DB25 male interface are separately connected to an input / output module 30, so as to remove the interference and virtual electricity caused by the common mode interference signal. In addition, the pin 17 of the output interface 50 adopting the DB25 male interface can be connected to a 5V power supply.

[0060] In some embodiments, please refer to Figure 4 , Figure 4 The EMI filter module 20 provided in the embodiment of the application is shown in a simple schematic diagram as Figure 4 shown, the EMI filter module 20 can include a common mode inductor and a circuit R3, the L11 end of the first coil L1 of the common mode inductor is connected to a pin of the input interface 10, the L12 end is connected to the input / output module 30, the L21 end and the L22 end of the second coil L2 of the common mode inductor are both grounded; one end of the resistor R3 is connected to the L12 end, and the other end is connected to the L22 end. The resistance of the resistor R3 can be 10KΩ.

[0061] Specifically, since the input signal forms a coupling signal with the external ground, after entering the common-mode inductor, it will generate a same-direction magnetic field in the coil due to the same direction of the common-mode interference current, thereby increasing the inductance of the coil, so that the coil behaves as high impedance, and a strong damping effect is generated, thereby attenuating the common-mode interference current, and achieving the purpose of filtering; when the normal differential-mode current in the circuit flows through the common-mode inductor, the current generates opposite magnetic fields in the common-mode inductor coil wound in the same phase and cancels each other out, so it has basically no attenuation effect on the normal differential-mode current. In addition, when the load is suspended, the current on the line is extremely small at this time, the common-mode inductor cannot generate an induced magnetic field, and it cannot also cancel the common-mode interference, and the resistor R3 in parallel with the load is used as a static load to eliminate the induced electric field by heat consumption when there is no load, so as to ensure that the output is low in the static state, that is, signal 0.

[0062] Please refer to Figure 5 , Figure 5 Another simple schematic diagram of the EMI filter module 20 provided by the embodiment of the present application is shown in the figure. Figure 5 In the embodiment shown in the figure, the input interface 10 adopts a DB25 male seat interface, since the pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 16, 18, 19, 21, 22, 23 actually transmit signals, the jump frequency thereof is in the interval of 20KHz-200KHz, so other signals except the frequency need to be excluded, thereby the authenticity of the signal is maximally maintained. Therefore, a capacitor C1 needs to be connected in parallel with the resistor in the EMI filter module 20 connected with the pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 16, 18, 19, 21, 22, 23 to form an RC circuit, and the AC signal burr loop is returned to the ground, thereby playing the effect of eliminating the interference frequency.

[0063] As shown in the figure, Figure 5 The EMI filter module 20 can include a common-mode inductor and an RC circuit; wherein the L31 end of the first coil L3 of the common-mode inductor is connected with a pin of the input interface 10, and the L32 end is connected with the input-output module 30, the L41 end and the L42 end of the second coil L4 of the common-mode inductor are both grounded, one end of the RC circuit is connected with the input-output module 30, and the other end is grounded. Specifically, the RC circuit can include a resistor R4 and a capacitor C1, the resistor R4 and the capacitor C1 are connected in parallel to constitute a parallel RC circuit, one end of the parallel RC circuit is connected with the conversion module, and the other end is grounded. Wherein, the resistance of the resistor R4 can be 10KΩ, and the capacitance of the capacitor C1 can be 1Nf.

[0064] In some embodiments, a level selection circuit is arranged in the input-output module 30, the level selection circuit accesses the reference voltage and switches the reference voltage. Specifically, since there are multiple versions of the controller, such as 5V, 3.3V, etc., by arranging a level selection circuit in the input-output module 30, the anti-signal interference adapter card in the present application can adapt to different versions of the controller.

[0065] In a more specific implementation process, a single-pole multi-throw switch is arranged in the level selection circuit, the power input end of the single-pole multi-throw switch is connected to the power supply end, and the multiple power output ends are each connected to the reference voltage through a resistor and grounded. Among them, the single-pole multi-throw switch can be a single-pole double-throw switch, a single-pole triple-throw switch, etc., which can be selected according to the version of the controller, and is not specifically limited in the present embodiment.

[0066] Please refer to Figure 6 , Figure 6 The simple schematic diagram of the level selection circuit provided by the embodiment of the present application is shown in Figure 6 In the embodiment shown in the figure, the controller is of two versions, 5V and 3.3V, so the single-pole multi-throw switch is a single-pole double-throw switch, wherein the 1 pin of the single-pole double-throw switch is the power input end, and the 2 and 3 pins are the power output ends. When the switch selects the 1 and 2 pins, R5 and R7 form a loop, wherein the resistance of R5 is 1.5KΩ and the resistance of R7 is 3.5KΩ, at this time the reference voltage V REF is calculated by Ohm's law as follows:

[0067] V REF = 5V x R7 / (R5+R7) = 3.5V

[0068] When the switch selects the 2 and 3 pins, R6 and R7 form a loop, wherein the resistance of R6 is 4.02KΩ, at this time the reference voltage V REF is calculated by Ohm's law as follows:

[0069] V REF = 5V x R34 / (R33+R34) = 2.32V

[0070] Therefore, when the level selection circuit provided in the present embodiment is used, the level selection circuit needs to be set first. When the output level of the controller is 3.3V, V REF is set to 2.32V; when the output level of the controller is 5V, V REF is set to 3.5V.

[0071] In some embodiments, as Figures 7-10As shown, the input-output module 30 comprises a first voltage comparator U1 and a first voltage follower U2; wherein the inverting input terminal of the first voltage comparator U1 is connected with one pin of the input interface 10 through the EMI filter module 20, the non-inverting input terminal is connected with a reference voltage, and the output terminal is connected with the base of the first voltage follower U2; the emitter and the collector of the first voltage follower U2 are connected with the same pin of the output interface.

[0072] Specifically, the first voltage comparator U1 can set the input signal into a unified standard output signal to be transmitted to the controller. Wherein, the output signal and the input signal have the following relationship: when the voltage of the non-inverting input terminal of the first voltage comparator U1 is greater than the voltage of the inverting input terminal, the voltage of the output terminal is 5V; when the voltage of the non-inverting input terminal is less than the voltage of the inverting input terminal, the voltage of the output terminal is 0V.

[0073] In addition, due to the different diameters and lengths of the wires, the input-output module 30 outputs high level or low level, i.e. digital signal 1 or 0. In the use of the laser, a 25PIN parallel port line is usually used for signal transmission, and the standard RV wire has a line resistance, which can be referred to Table 2.

[0074] Table 2: Parameter table of standard RV wire

[0075]

[0076] As can be seen from Table 2, when the diameter and length of the wire are different, the wire resistance is also different, thereby causing a pressure difference between the controller and the controlled device. For example, when the wire length is 3m and the parameter is 25*0.5mm 2 , the wire resistance is 36 ohms. If the controller outputs a 5V voltage and the input impedance of the controlled device is set to 1K ohms, the signal Vin received by the controlled device can be calculated as:

[0077] Vin=5V×1K / (1K+36)=4.83V

[0078] When the wire length is 5m and the parameter is 25*0.75mm 2 , the wire resistance is 55 ohms. If the controller outputs a 5V voltage and the input impedance of the controlled device is set to 1K ohms, the signal Vin received by the controlled device can be calculated as:

[0079] Vin=5V×1K / (1K+55)=4.74V

[0080] It can be seen that the signal value received by the controlled device in the above two cases is different due to the different lengths of the transmission line, but it is actually a high level signal, i.e. an effective signal. However, in some application scenarios, a transmission line longer than 5 meters is used, and the signal received by the controlled device is smaller, so that the controlled device may receive a signal between 3.5V and 5V, and the controlled device may misread due to different signals. Therefore, the signal needs to be adjusted to a unified standard for transmission to the controlled device, i.e. 5V, and the first voltage comparator U1 in the embodiment can achieve the above goal.

[0081] Specifically, the main function of the first voltage follower U2 is to enhance the load capacity of the output, which is equivalent to a constant voltage source. Within the design range, the output voltage is constant regardless of the change of the circuit connected to the rear stage, and the amplification multiple or other performance of the front stage is maintained unchanged. Otherwise, if the output resistance of the front stage is large and the input impedance of the rear stage is small, the signal will be distorted. For example, a sine voltage waveform with a peak value of 5V, when loaded to the rear stage, the sine peak value may only be 4V. Since the input impedance of the first voltage follower U2 is high, generally about megaohm, after the first voltage follower U2 is added, the waveform loaded to the input terminal of the first voltage follower U2 will not change much, and the input-output stage voltage ratio is close to one, thereby playing a buffering role.

[0082] In addition, since the input impedance of the first voltage follower U2 is large, it can be approximately considered as an open circuit (relative to the front stage circuit), thereby preventing the front stage circuit from affecting the rear stage circuit, thereby playing an isolation role.

[0083] In specific application scenarios, for example, in a laser application site, two or even multiple lasers are connected in parallel to a same controller for operation. At this time, the working state of the multiple lasers is kept the same at all times, and a problem occurs in use, i.e. the load capacity of the controller is insufficient to drive multiple lasers at the same time, resulting in distortion of the output signal of the controller. A more obvious case is that the effective signal is originally 5V, and due to the excessive load current, the 5V is pulled down to 4V or even lower. When it is lower than 3.5V, it is insufficient as a control signal, resulting in the laser stopping working. The first voltage follower U2 can solve the above problem.

[0084] In addition, the power supply end of the first voltage comparator U1 can be connected to a 5V voltage, or can be grounded after being connected to the capacitor C2, and the ground end can be grounded or not grounded, and the power supply end and the ground end are selected according to the actual output signal. Similarly, the power supply end of the first voltage follower U2 can be connected to a 5V voltage, or can be grounded after being connected to the capacitor C3, and the ground end can be grounded or not grounded, and the power supply end and the ground end are selected according to the actual output signal. The circuit diagram formed by connecting the first voltage comparator U1 and the first voltage follower U2 can be referred to in Figures 7-10 .

[0085] For example, if the input interface 10 and the output interface 50 both adopt a DB25 male seat interface, the pins 1, 3, 5, 7, 9, 11, 12, 16, 18, 21, and 22 of the DB25 male seat interface of the input interface 10 are respectively connected to an EMI filter module 20, and then connected to a first voltage comparator U1, and the power supply end of the first voltage comparator U1 is connected to a 5V voltage and grounded after being connected to the capacitor C2. The pins 1, 3, 5, 7, 11, 12, 16, 18, 20, 21, and 22 of the DB25 male seat interface of the output interface 50 are connected to a first voltage follower U2, and the power supply end of the first voltage follower U2 is connected to a 5V voltage and grounded after being connected to the capacitor C3.

[0086] In some embodiments, as shown in Figures 11-14 , the input and output module 30 includes a second voltage follower U4 and a second voltage comparator U3. The emitter and the collector of the second voltage follower U4 are connected to the same pin of the input interface 10 through the EMI filter module 20, and the base is connected to the output end of the second voltage comparator U3. The non-inverting input end of the second voltage comparator U3 is connected to a reference voltage, and the inverting input end is connected to a pin of the output interface. The second voltage follower U4 and the second voltage comparator U3 are used to realize the reverse stable flow of the signal, and the reverse flow of the signal is usually an alarm signal.

[0087] The power supply end of the second voltage comparator U3 can be connected to a 5V voltage, or can be grounded after being connected to the capacitor C4, and the ground end can be grounded or not grounded, and the power supply end and the ground end are selected according to the actual output signal. Similarly, the power supply end of the second voltage follower U4 can be connected to a 5V voltage, or can be grounded after being connected to the capacitor C5, and the ground end can be grounded or not grounded, and the power supply end and the ground end are selected according to the actual output signal. The circuit diagram formed by connecting the second voltage comparator U3 and the second voltage follower U4 can be referred to in Figures 11-14 .

[0088] For example, if both input interface 10 and output interface 50 use DB25 male connectors, then after each of the pins 11, 12, 16, and 21 of the DB25 male connector of input interface 10 is connected to an EMI filter module 20, a second voltage follower U4 is connected to each of these pins. The power supply terminal of the second voltage follower U4 is connected to 5V and is grounded after being connected to a capacitor C5. Similarly, for the DB25 male connector of output interface 50, each of the pins 11, 12, 16, and 21 is connected to a second voltage comparator U3. The power supply terminal of the second voltage comparator U3 is connected to 5V and is grounded after being connected to a capacitor C4.

[0089] In addition, the first voltage comparator U1 and the second voltage comparator U3 can be LM393, and the first voltage follower U2 and the second voltage follower U4 can be LM358.

[0090] In some embodiments, such as Figure 15 As shown, the voltage boosting module 40 includes a control chip U5 and a controllable switch U6; wherein, one end of the control chip U5 is connected to the input interface 10 and the other end is connected to the power supply terminal, and the control chip U5 is used to realize voltage reduction; one end of the controllable switch U6 is connected to the input interface 10 and the other end is connected to the power supply terminal, and the controllable switch U6 is used to realize voltage boosting. The voltage boost / buck module 40 may also include capacitors C9 and C10, inductor L5, diode D3, C14 and C15, inductor L6, diodes D4, D5 and D6. The DRVC, SWC, IPK and VCC pins of the control chip U5 are electrically connected to the same pin (e.g., pin 17) of the input interface 10. The SWE pin of the control chip U5 is connected to the cathode of diode D3 and one end of inductor L5, respectively. The other end of inductor L5 is electrically connected to a 5V power supply. The anode of diode D3 is grounded. Capacitor C9 has positive and negative terminals. The negative terminal of capacitor C9 is grounded and the positive terminal is connected to a 5V power supply. One end of capacitor C10 is grounded and the other end is connected to a 5V power supply. The SWC pin of the controllable switch U6 is connected to the DRVC pin through the inductor L6. The DRVC pin, IPK pin, and VCC pin are all connected to the cathode of the diode D4. The anode of the diode D4 is electrically connected to the same pin (e.g., pin 17) of the input interface 10. At the same time, the SWC pin is connected to the anode of the diode D5. The cathode of the diode D5 is connected to the positive terminal of the capacitor C14, one end of the capacitor C15, and the anode of the diode D6. The negative terminal of the capacitor C14 is grounded, the other end of the capacitor C15 is grounded, and the cathode of the diode D6 is connected to the 5V power supply.

[0091] The control chip U5 and the capacitor C9, the capacitor C10, the inductor L5, and the diode D3 form a BUCK voltage reduction circuit, and the controllable switch U6 and the capacitor C14, the capacitor C15, the inductor L6, the diode D4, the diode D5, and the diode D6 form a BOOST voltage increase circuit. The BUCK voltage reduction circuit and the BOOST voltage increase circuit can provide a stable and accurate 5V power supply for the input and output module 30. In addition, the control chip U5 and the controllable switch U6 can be MC34063AD type devices.

[0092] Specifically, the working process of the BUCK voltage reduction circuit is as follows: when the pin SWE of the control chip U5 outputs a pulse signal, that is, a high level, the diode D3 acts as a freewheeling diode, the anode voltage is zero, the cathode voltage is the voltage Us, and therefore the reverse is cut off. The current Is flowing through the inductor L5 to the load. At this time, the current in the inductor L5 gradually rises, and the self-induced potential of the left positive and right negative end of the inductor L5 hinders the rise of the current, and the inductor L5 converts the electrical energy into magnetic energy and stores it. After the time TON, the pin SWE of the control chip U5 is low, and the current in the inductor L5 cannot change abruptly. At this time, the self-induced potential of the right positive and left negative end of the inductor L5 hinders the decrease of the current, so that the diode D3 is forward biased and turned on. Therefore, the current in the inductor L5 gradually decreases, and the magnetic energy stored in the inductor L5 is converted into electrical energy and released to supply the load. After the time TOFF, the control chip U5 is turned on, and the above process is repeated. The functions of the capacitor C9 and the capacitor C10 are to reduce the pulsation of the output voltage Uo.

[0093] The working process of the BOOST voltage increase circuit is as follows: when the controllable switch U6 is in the on state, the inductor L6 is charged, and the charging current is basically constant as Ii, and at the same time the voltage on the capacitor C14 supplies power to the load. Since the capacitor C14 (100 μF) has a large capacitance value, it can basically maintain the output voltage Uo as a constant value. If the time when the controllable switch U6 is in the on state is TON, when the controllable switch U6 is in the off state, the controllable switch U6 and the inductor L6 together charge the capacitor C14 and provide energy to the load. If the time when the controllable switch U6 is in the off state is TOFF, then during this period the energy released by the inductor L6 is (Uo-U6) Iitoff. When the circuit works in a stable state, the energy accumulated in the inductor L6 in one period T is equal to the energy released. During the charging process, the controllable switch U6 is closed, and the input voltage flows through the inductor. The diode D4, the diode D5, and the diode D6 can prevent the capacitor from discharging to ground.

[0094] In addition, since the input is direct current, the current on the inductor L6 increases linearly at a certain ratio (related to the size of the inductor L6). As the inductor current increases, part of the energy is stored in the inductor L6. During the discharge process, the controllable switch U6 is turned off. Due to the current retention characteristics of the inductor L6, the current flowing through the inductor L6 does not immediately become 0, but slowly changes from the value at the end of charging to 0, and the original circuit has been disconnected. Therefore, the inductor L6 can only discharge through the new circuit, that is, the inductor L6 starts to charge the capacitor C14 and the capacitor C15, and the voltage across the capacitor C14 and the capacitor C15 rises. At this time, the voltage across the capacitor C14 and the capacitor C15 is higher than the input voltage, and then the voltage is boosted; during charging, the inductor L absorbs energy, and during discharging, the inductor releases energy. If the capacitance of the capacitor C14 and the capacitor C15 is large enough, a continuous current can be maintained at the output end during the discharging process. If the on-off process is repeated continuously, a voltage higher than the input voltage can be obtained across the capacitor C14 and the capacitor C15.

[0095] Function test

[0096] The anti-signal interference adapter provided in the application is tested by connecting three DB25 female heads in parallel as output interfaces 50 after passing through a controller, and then connecting the DB25 parallel ports with lasers respectively for control. The controller is a controller of the IPC-610MB-Lw / 250W 80+ model, the controller runs the self-owned automation software of Rayker, and the lasers are composed of three P20QS models.

[0097] The content of the function test is to control the lasers to output laser beams through the software running on the controller, so that the three lasers respectively aim at three marking points for operation, and rapid marking test is performed. The test result is shown in Figure 16 From Figure 16 It can be seen that the similarity of the three icons reaches 100%.

[0098] The anti-signal interference adapter provided in the application is specially used for adapting signals of lasers. It is the first adapter specially designed for industrial laser adapters. The adapter can completely eliminate the problem of signal interference of existing controllers. At the same time, the adapter is safe because it adopts industry interface definition and meets international general standards, so it is suitable for lasers and controllers produced by any manufacturer in the market. In addition, when a controller controls multiple lasers at the same time, other devices can work in the same state with the help of the adapter, so as to realize the synchronous work of multiple devices and greatly improve the ability of cooperative action.

[0099] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A signal interference protection adapter card, characterized by The application relates to a signal processing circuit, which comprises the following parts: an input interface; at least one EMI filter module connected with the input interface and used for eliminating common-mode interference; at least one input-output module connected with the EMI filter module and used for converting input interference signals into digital signals and stabilizing output signals; the digital signals are high-level signals or low-level signals; a voltage lifting module connected with the input interface and used for stabilizing output power supply; at least one output interface connected with the input-output module; the input-output module comprises a first voltage comparator and a first voltage follower; the inverting input end of the first voltage comparator is connected with one pin of the input interface through the EMI filter module, the non-inverting input end is connected with a reference voltage, and the output end is connected with the base of the first voltage follower; the emitter and the collector of the first voltage follower are connected with the same pin of the output interface.

2. The signal interference protection adapter card of claim 1, wherein, The pins of the input interface are respectively connected with one EMI filter module, and the pins of the output interface are respectively connected with one input-output module.

3. The signal interference shielded adapter card of claim 1, wherein, One EMI filter module is connected with one input-output module.

4. The signal interference protection adapter card of claim 1, wherein, The EMI filter module comprises a common-mode inductor and an RC circuit; one end of the first coil of the common-mode inductor is connected with one pin of the input interface, the other end is connected with the input-output module, both ends of the second coil of the common-mode inductor are grounded, one end of the RC circuit is connected with the input-output module, and the other end is grounded.

5. The signal interference protection adapter card of claim 4, wherein, The RC circuit is a parallel RC circuit, one end of the parallel RC circuit is connected with the input-output module, and the other end is grounded.

6. The signal-impedance card of claim 1, wherein, The input-output module is provided with a level selection circuit, the level selection circuit is connected with a reference voltage, and the switching of the reference voltage is realized.

7. The signal-impedance card of claim 6, wherein, The level selection circuit is provided with a single-pole multi-throw switch, the power input end of the single-pole multi-throw switch is connected with a power supply end, and the multiple power output ends are respectively connected with the reference voltage through a resistor and grounded.

8. The signal-impedance card of claim 1, wherein, The input-output module comprises a second voltage comparator and a second voltage follower; one end of the second voltage follower is connected with the same pin of the input interface through the EMI filter module, the base is connected with the output end of the second voltage comparator; the non-inverting input end of the second voltage comparator is connected with a reference voltage, and the inverting input end is connected with one pin of the output interface.

9. The signal-impedance card of claim 1, wherein, The voltage lifting module comprises a control chip and a controllable switch; one end of the control chip is connected with the input interface, the other end is connected with a power supply end, and the control chip is used for realizing voltage reduction; one end of the controllable switch is connected with the input interface, the other end is connected with a power supply end, and the controllable switch is used for realizing voltage lifting.

Images