Live detection circuit and laser processing equipment

Abstract

The present application proposes a charged detection circuit and laser processing equipment, including a first detection circuit and a micro control unit, wherein the micro control unit is connected to the first detection circuit. The first detection circuit is configured to: if the housing is charged, output a first level signal to the micro control unit; if the housing is not charged, output a second level signal to the micro control unit. The micro control unit is configured to: if a first level signal is received, output a first signal, the first signal is used to indicate that the housing is charged; if a second level signal is received, output a second signal, the second signal is used to indicate that the housing is not charged. Through the first detection circuit and the micro control unit, it is possible to detect whether the housing of the laser processing equipment is charged, which can prevent the user from connecting the laser processing equipment to the computer without knowing it, causing damage to the computer and the laser processing equipment, and avoiding property losses.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a live detection circuit and laser processing equipment. Background Art

[0002] At present, the ground wires of all desktop computers are directly connected to the signal ground of the desktop computer. Once the laser processing equipment case is energized, there will be a voltage between the signal ground of the desktop computer motherboard and the signal ground of the laser processing equipment motherboard. In this case, if connected to the desktop computer, the signal grounds on both sides will form a loop, causing a short circuit, which will burn out the computer and the laser processing equipment motherboard. Utility Model Content

[0003] The main purpose of the embodiments of the present application is to provide a live detection circuit and a laser processing device. The live detection circuit is intended to detect whether the housing of the laser processing device is live, thereby preventing the user from connecting the laser processing device to a computer without knowing it, causing damage to the computer and the laser processing device, and avoiding property losses.

[0004] To achieve the above-mentioned purpose, the embodiment of the present application proposes a live detection circuit and a laser processing device, which are arranged on a printed circuit board mainboard of the laser processing device, and include a first detection circuit and a micro control unit, wherein the micro control unit is connected to the first detection circuit;

[0005] The first end of the first detection circuit is used to connect to the housing of the laser processing equipment, and the second end of the first detection circuit is used to connect to the first power supply output by the printed circuit board mainboard;

[0006] The first detection circuit is configured to: if the housing is powered, output a first level signal to the micro control unit; if the housing is not powered, output a second level signal to the micro control unit;

[0007] The micro control unit is configured to: if the first level signal is received, output a first signal, the first signal is used to indicate that the housing is powered; if the second level signal is received, output a second signal, the second signal is used to indicate that the housing is not powered.

[0008] In one embodiment of the present application, the first detection circuit includes a MOS transistor switch circuit.

[0009] In one embodiment of the present application, the MOS switch circuit includes: a first resistor, a first capacitor, an NMOS transistor, and a second resistor;

[0010] A first end of the first resistor is connected to the housing, and a second end of the first resistor is connected to the gate of the NMOS transistor;

[0011] The first end of the first capacitor is connected to the second end of the first resistor and connected to the gate of the NMOS transistor, and the second end of the first capacitor is connected to the source of the NMOS transistor and grounded;

[0012] The drain of the NMOS transistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the first power supply.

[0013] In one embodiment of the present application, the micro control unit is connected between the drain of the NMOS transistor and the first end of the second resistor.

[0014] In one embodiment of the present application, the live detection circuit further includes a voltage division protection circuit;

[0015] A first end of the voltage-dividing protection circuit is connected to the housing, and a second end of the voltage-dividing protection circuit is connected to a first end of the first resistor.

[0016] In one embodiment of the present application, the voltage-dividing protection circuit includes: a third resistor, a fourth resistor, and a transient suppression diode;

[0017] A first end of the third resistor is connected to the housing, and a second end of the third resistor is connected to a first end of the first resistor;

[0018] The first end of the fourth resistor is connected to the second end of the third resistor, and the second end of the fourth resistor is connected to the first end of the transient suppression diode and then grounded together;

[0019] The second end of the transient suppression diode is connected between the second end of the third resistor and the first end of the first resistor.

[0020] In one embodiment of the present application, the charged detection circuit further includes an alarm circuit, and the alarm circuit is connected to the micro control unit;

[0021] The alarm circuit is configured to: if the first signal is received, drive to sound an alarm; if the second signal is received, do not drive to sound an alarm;

[0022] The alarm circuit includes at least one of an acoustic alarm circuit, an optical alarm circuit, and an acoustic and optical alarm circuit.

[0023] In one embodiment of the present application, the alarm circuit includes a buzzer drive circuit, and the buzzer drive circuit includes a fifth resistor, a transistor, a diode and a buzzer;

[0024] A first end of the fifth resistor is connected to the output end of the micro control unit, and a second end of the fifth resistor is connected to the base of the transistor;

[0025] The emitter of the transistor is grounded, and the collector of the transistor is connected to the first end of the buzzer;

[0026] The first end of the diode is connected between the collector of the transistor and the first end of the buzzer, and the second end of the diode is grounded;

[0027] The second end of the buzzer is connected to an external power source.

[0028] In one embodiment of the present application, the buzzer driving circuit further includes a second capacitor and a sixth resistor;

[0029] The first end of the second capacitor is connected to the second end of the fifth resistor and then connected to the base of the transistor; the second end of the second capacitor is connected to the emitter of the transistor and then grounded;

[0030] The first end of the sixth resistor is connected to the first end of the second capacitor, the second end of the sixth resistor is connected to the second end of the second capacitor, and / or,

[0031] The buzzer driving circuit also includes a third capacitor and a seventh resistor;

[0032] The first end of the third capacitor is connected to the second end of the diode, and the second end of the third capacitor is grounded;

[0033] The first end of the seventh resistor is connected to the second end of the buzzer, and the second end of the seventh resistor is connected to the external power supply.

[0034] To achieve the above objectives, the present application provides a laser processing device, including:

[0035] Laser processing equipment body;

[0036] A casing, on which the laser processing equipment body is mounted;

[0037] A charge detection device is electrically connected to the housing, and the charge detection device is configured to detect whether the housing is charged.

[0038] In one embodiment of the present application, the charge detection device includes the charge detection circuit provided in any embodiment of the present application, the laser processing equipment body includes a printed circuit board mainboard, and the charge detection circuit is arranged on the printed circuit board mainboard.

[0039] In one embodiment of the present application, a first hole is provided on the printed circuit board mainboard, a fastener passes through the first hole and an end of the fastener contacts the housing, and a first end of the first detection circuit is electrically connected to the housing through the first hole.

[0040] The present application proposes a charged detection circuit and a laser processing device, comprising a first detection circuit and a micro control unit, wherein the micro control unit is connected to the first detection circuit; wherein the first end of the first detection circuit is connected to the housing of the laser processing device, and the second end of the first detection circuit is connected to the first power supply output by the printed circuit board mainboard; the first detection circuit is configured to: if the housing is charged, output a first level signal to the micro control unit; if the housing is not charged, output a second level signal to the micro control unit. The micro control unit is configured to: if the first level signal is received, output a first signal, the first signal is used to indicate that the housing is charged; if the second level signal is received, output a second signal, the second signal is used to indicate that the housing is not charged. Through the first detection circuit and the micro control unit, it is possible to detect whether the housing of the laser processing device is charged, thereby preventing the user from connecting the laser processing device to the computer without knowing it, causing damage to the computer and the laser processing device, and avoiding property losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the connection between the laser cutting machine and the computer;

[0042] Figure 2 is a structural block diagram of a live detection circuit provided in an embodiment of the present application;

[0043] Figure 3 is a circuit diagram of a MOS tube switch circuit provided in an embodiment of the present application;

[0044] Figure 4 is a circuit diagram of a buzzer driving circuit provided in an embodiment of the present application;

[0045] Figure 5 It is a circuit diagram of a charged detection circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0049] Laser processing equipment, such as laser cutting machines, have many PCBAs (printed circuit boards) inside. Different PCBAs are connected by wires, and there are various voltages, such as 48V, 24V, 12V, 5V, 3.3V, etc. During factory production and assembly or when users disassemble and assemble by themselves, if the metal shell accidentally breaks the wire skin, it will cause a short circuit between the laser cutting machine casing and the charged wire. Under normal circumstances, the casing is connected to the ground. Once the casing is short-circuited with the positive pole of the wire (48V, 24V, 12V, 5V, 3.3V), there will be voltage between the casing and the signal ground. At this time, the laser cutting machine can still work normally.

[0050] During the laser processing of the workpiece, the laser cutting machine needs to be connected to a computer so that the laser cutting machine can be controlled by the computer. Figure 1 , Figure 1 This is a schematic diagram of the connection between the laser cutting machine and the computer. Figure 1 As shown in the figure, the ground wire of the desktop computer is directly connected to the signal ground of the desktop computer. When the metal shell (casing) of the laser cutting machine and the switching power supply of the whole machine are short-circuited, there will be a voltage between the signal ground of the desktop computer motherboard and the signal ground of the laser cutting machine motherboard. If the laser cutting machine motherboard is connected to the desktop computer motherboard in this case, the signal grounds on both sides will form a loop, causing a short circuit. This will cause the computer and the laser cutting machine motherboard to burn out.

[0051] Based on this, an embodiment of the present application proposes a power detection circuit, through which it is possible to detect whether the casing of the laser processing equipment is powered, thereby preventing the user from connecting the laser processing equipment to the computer without knowing it, causing damage to the computer and the laser processing equipment, and avoiding property loss.

[0052] Reference Figure 2 , Figure 2 1 is a block diagram of a charged detection circuit provided in an embodiment of the present application, which is arranged on a printed circuit board mainboard of a laser processing device. Figure 2As shown, the charged detection circuit includes a first detection circuit 210 and a micro control unit 220, and the micro control unit 220 is connected to the first detection circuit 210. Wherein:

[0053] The first end of the first detection circuit 210 is used to connect to the housing of the laser processing equipment, and the second end of the first detection circuit 210 is used to connect to the first power supply output by the printed circuit board mainboard.

[0054] The first detection circuit 210 is configured to output a first level signal to the micro control unit 220 if the housing is powered, and to output a second level signal to the micro control unit 220 if the housing is not powered.

[0055] The micro control unit 220 is configured to: if a first level signal is received, output a first signal, the first signal is used to indicate that the housing is powered; if a second level signal is received, output a second signal, the second signal is used to indicate that the housing is not powered.

[0056] In the embodiment of the present application, the first detection circuit 210 and the micro control unit 220 cooperate to detect whether the housing of the laser processing equipment is charged. When it is detected that the housing of the laser processing equipment is charged, the micro control unit 220 outputs a first signal to remind the user that the housing of the laser processing equipment is charged. When it is detected that the housing of the laser processing equipment is not charged, the micro control unit 220 outputs a second signal to remind the user that the housing of the laser processing equipment is not charged. In this way, the user can be reminded when the housing of the laser processing equipment is charged, so as to avoid the user from connecting the laser processing equipment to the computer without knowing it, causing damage to the computer and the laser processing equipment, and avoiding property loss.

[0057] Continue to refer to Figure 2 In one embodiment of the present application, the power detection circuit also includes an alarm circuit 230, which is connected to the micro control unit 220. The alarm circuit 230 is configured to: if a first signal output by the micro control unit 220 is received, then drive the alarm; if a second signal output by the micro control unit 220 is received, then do not drive the alarm.

[0058] In one embodiment of the present application, the alarm circuit 230 includes at least one of an acoustic alarm circuit, an optical alarm circuit, and an acoustic and optical alarm circuit, that is, the alarm circuit 230 can use an acoustic alarm circuit, which can issue an acoustic alarm to remind the user that the housing is charged when receiving the first signal sent by the micro control unit 220. When receiving the second signal sent by the micro control unit 220, no acoustic alarm is issued to let the user know that the housing is not charged. The alarm circuit 230 can also use an optical alarm circuit, which can issue a light alarm (such as a light or flashing light) to remind the user that the housing is charged when receiving the first signal sent by the micro control unit 220. When receiving the second signal sent by the micro control unit 220, no light alarm is issued to let the user know that the housing is not charged. The alarm circuit 230 can also use an acoustic and optical alarm circuit, which can issue an acoustic and light alarm at the same time to remind the user that the housing is charged when receiving the first signal sent by the micro control unit 220. When receiving the second signal sent by the micro control unit 220, no sound and light alarm are issued to let the user know that the housing is not charged.

[0059] In one embodiment of the present application, the first detection circuit 210 includes a MOS transistor switch circuit, which uses the principle of controlling the on and off of the MOS transistor source (s) and drain (d) by the MOS transistor gate (g), so that when the housing of the laser processing equipment is powered, the MOS transistor is turned on and outputs a first level signal (such as a high level signal or a low level signal), and when the housing of the laser processing equipment is not powered, the MOS transistor is turned off and outputs a second level signal (such as a low level signal or a high level signal). Or when the housing of the laser processing equipment is powered, the MOS transistor is turned off and outputs a first level signal (such as a high level signal or a low level signal), and when the housing of the laser processing equipment is not powered, the MOS transistor is turned on and outputs a second level signal (such as a low level signal or a high level signal).

[0060] Exemplarily, the first detection circuit 210 may use a P-channel MOS transistor switch circuit. When the housing of the laser processing equipment is powered, the MOS transistor is disconnected and outputs a high-level signal; when the housing of the laser processing equipment is not powered, the MOS transistor is turned on and outputs a low-level signal. The first detection circuit 210 may also use an N-channel MOS transistor switch circuit. When the housing of the laser processing equipment is powered, the MOS transistor is turned on and outputs a low-level signal; when the housing of the laser processing equipment is not powered, the MOS transistor is disconnected and outputs a high-level signal.

[0061] Reference Figure 3 , Figure 3 is a circuit diagram of a MOS tube switch circuit provided in an embodiment of the present application. Figure 3 As shown, the MOS switch circuit includes: a first resistor R1, a first capacitor C1, an NMOS transistor Q65, and a second resistor R2. Wherein:

[0062] The first end of the first resistor R1 is connected to the housing of the laser processing equipment, and the second end of the first resistor R1 is connected to the gate G of the NMOS transistor Q65. The first end of the first capacitor C1 is connected to the second end of the first resistor R1 and then connected to the gate of the NMOS transistor Q65, and the second end of the first capacitor C1 is connected to the source S of the NMOS transistor Q65 and then connected to the ground DGND. The drain D of the NMOS transistor Q65 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the first power supply VCC3V.

[0063] In an embodiment of the present application, the first end of the first resistor R1 is connected to a fixing screw hole of a printed circuit board mainboard of a laser processing device. The screw hole is covered with copper. The screw passes through the screw hole and the end of the screw is connected to the casing of the laser processing device. The casing is directly connected to the ground wire of the power supply, thereby grounding the first end of the MOS tube switch circuit.

[0064] Reference Figure 3 , the micro control unit 220 is connected between the drain D of the NMOS transistor Q65 and the first end of the second resistor R2.

[0065] In the embodiment of the present application, when the housing of the laser processing equipment is not powered, the NMOS transistor Q65 is not turned on. At this time, since the drain D of the NMOS transistor Q65 is connected to the positive power supply VCC3V through the second resistor R2, the drain D of the NMOS transistor Q65 and the first end of the second resistor R2, that is, PE_TEST is in a high level state. That is, the micro-control unit detects that the drain of the NMOS transistor and the first end of the second resistor are in a high level state. When the housing of the laser processing equipment is powered, the NMOS transistor Q65 is turned on. At this time, the drain D of the NMOS transistor Q65 and the first end of the second resistor R2, that is, PE_TEST is in a low level state. That is, the micro-control unit detects that the drain of the NMOS transistor and the first end of the second resistor are in a low level state.

[0066] In some embodiments, the power detection circuit further includes a voltage divider protection circuit, a first end of the voltage divider protection circuit is connected to a housing of the laser processing equipment, and a second end of the voltage divider protection circuit is connected to a first end of the first resistor.

[0067] Specifically, refer to Figure 3 , the voltage divider protection circuit includes: a third resistor R3, a fourth resistor R4 and a transient suppression diode D1. Wherein:

[0068] The first end of the third resistor R3 is connected to the housing of the laser processing equipment, and the second end of the third resistor R3 is connected to the first end of the first resistor R1. The first end of the fourth resistor R4 is connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is connected to the first end of the transient suppression diode D1 and then grounded together DGND. The second end of the transient suppression diode D1 is connected between the second end of the third resistor R3 and the first end of the first resistor R1.

[0069] In the embodiment of the present application, voltage division protection is performed by a voltage division protection circuit, so that the input voltage can be reduced to an appropriate range, excessive load pressure on circuit elements can be avoided, and the normal operation and safe operation of the MOS tube switch circuit can be protected.

[0070] In the present application, refer to Figure 3 When the housing of the laser processing equipment is powered (3.3-48V), after the voltage is divided by the third resistor R3 and the fourth resistor R4, the voltage at point A is between 1.1-16.2V. At the same time, this voltage range can turn on the NMOS transistor Q65, so that the first signal transmitted to the micro control unit (MCU) (ie, PE_TEST in the figure) is low level. When the housing of the laser processing equipment is not powered, the voltage at point A is 0V, the NMOS transistor Q65 is not turned on, and the second signal transmitted to the micro control unit (MCU) (ie, PE_TEST in the figure) is pulled to a high level state through the second resistor R2 (pull-up circuit).

[0071] In the embodiment of the present application, through the MOS tube switch circuit, when the casing of the laser processing equipment is powered, a low-level signal can be output to the micro-control unit, so that after receiving the low-level signal, the micro-control unit can output a first signal to remind the user that the casing is powered. After receiving the low-level signal, the micro-control unit will output a first signal to the alarm circuit, so that the alarm circuit will send an alarm signal after receiving the first signal to remind the user that the casing is powered. Through the MOS tube switch circuit, when the casing of the laser processing equipment is not powered, a high-level signal can be output to the micro-control unit, so that after receiving the high-level signal, the micro-control unit can output a second signal to remind the user that the casing is not powered. After receiving the high-level signal, the micro-control unit will output a second signal to the alarm circuit, so that the alarm circuit will not send an alarm signal to inform the user that the casing is not powered after receiving the second signal.

[0072] In one embodiment of the present application, the alarm circuit includes a buzzer driving circuit. Figure 4 , Figure 4 is a circuit diagram of a buzzer driving circuit provided in an embodiment of the present application. Figure 4 As shown, the buzzer driving circuit includes a fifth resistor R5, a transistor Q23, a diode D2 and a buzzer SPKR1. Wherein:

[0073] The first end of the fifth resistor R5 is connected to the first level signal, and the second end of the fifth resistor R5 is connected to the base b of the transistor Q23. The emitter e of the transistor Q23 is grounded, and the collector c of the transistor Q23 is connected to the first end 2 of the buzzer SPKR1. The first end of the diode D2 is connected between the collector c of the transistor Q23 and the first end 2 of the buzzer SPKR1, and the second end of the diode D2 is grounded DGND. The second end 1 of the buzzer SPKR1 is connected to the external power supply VCC5V.

[0074] Continue to refer to Figure 4 The buzzer driving circuit also includes a second capacitor C2 and a sixth resistor R6; the first end of the second capacitor C2 is connected to the second end of the fifth resistor R5 and then connected to the base b of the transistor Q23, the second end of the second capacitor C2 is connected to the emitter e of the transistor Q23 and then connected to the ground DGND. The first end of the sixth resistor R6 is connected to the first end of the second capacitor C2, and the second end of the sixth resistor R6 is connected to the second end of the second capacitor C2.

[0075] Continue to refer to Figure 4 The buzzer driving circuit also includes a third capacitor C3 and a seventh resistor R7; the first end of the third capacitor C3 is connected to the second end of the diode D2, and the second end of the third capacitor C3 is grounded; the first end of the seventh resistor R7 is connected to the second end 1 of the buzzer SPKR1, and the second end of the seventh resistor R7 is connected to the external power supply VCC5V.

[0076] In the present application, refer to Figure 4 When the micro-control unit on the printed circuit board receives the first level signal output by the first detection circuit, that is, when the received PE_TEST is a low level signal, the micro-control unit outputs the first signal to the first end of the fifth resistor R5, and drives the transistor Q23 to open by sending a fixed frequency, so that the buzzer SPKR1 emits a harsh alarm sound to remind the user that the casing of the laser processing equipment is charged, so as to inform the user that the laser processing equipment is prohibited from connecting to the computer under abnormal conditions. When the printed micro-control unit receives the second level signal output by the first detection circuit, that is, when the received PE_TEST is a high level signal, the micro-control unit outputs the second signal to the first end of the fifth resistor R5, and cannot drive the transistor Q23 to open, and the buzzer SPKR1 does not emit an alarm sound, so as to inform the user that the casing of the laser processing equipment is not charged.

[0077] It is understandable that the embodiment of the present application can send out an alarm to remind the user when it detects that the housing of the laser processing equipment is energized by setting a buzzer driving circuit. As an alternative, when the microcontroller unit detects that the housing of the laser processing equipment is energized, it can forcefully shut down the switch power output through a MOS tube or a relay to directly prohibit the use of the laser processing equipment until the short circuit fault is eliminated and the laser processing equipment can be turned on normally.

[0078] Reference Figure 5 , Figure 5 is a circuit diagram of a charged detection circuit provided in an embodiment of the present application. Figure 5 The live detection circuit shown can drive the buzzer to sound an alarm when the housing of the laser processing equipment is live, thereby preventing the user from connecting the laser processing equipment to the computer without knowing it, causing damage to the computer and the laser processing equipment, and avoiding property loss.

[0079] An embodiment of the present application also provides a laser processing device, comprising: a laser processing device body, a housing and a live detection device, wherein the laser processing device body is mounted on the housing, the live detection device is electrically connected to the housing, and the live detection device is configured to detect whether the housing is live.

[0080] In an embodiment of the present application, the laser processing equipment includes a live detection device, which is electrically connected to the casing of the laser processing equipment, so that it can alert the user when it detects that the casing is charged. This can prevent the user from connecting the laser processing equipment to a computer without knowing it, causing damage to the computer and the laser processing equipment, thereby avoiding property loss.

[0081] In one embodiment of the present application, the live detection device includes the live detection circuit provided in any embodiment of the present application, the laser processing equipment body includes a printed circuit board mainboard, and the live detection circuit is arranged on the printed circuit board mainboard.

[0082] In the embodiment of the present application, by setting the live detection circuit on the printed circuit board mainboard of the laser processing equipment body, the circuit layout space can be saved and the cost can be saved.

[0083] In one embodiment of the present application, a first hole is provided on the printed circuit board mainboard, the fastener passes through the first hole and the end of the fastener contacts the housing, and the first end of the first detection circuit is electrically connected to the housing through the first hole.

[0084] In the embodiment of the present application, by setting a first hole position on the printed circuit board mainboard, and passing a fastener through the first hole position and the end of the fastener in contact with the housing, the housing can be fixed on the printed circuit board mainboard by the fastener. At the same time, the connection end (i.e., the first end) of the first detection circuit is connected to the first hole position to connect with the housing. For example, the connection end (i.e., the first end) of the first detection circuit can pass through the first hole position to contact the housing to form an electrical connection with the housing, or copper can be coated in the first hole position, and the connection end (i.e., the first end) of the first detection circuit can be connected to the first hole position to form an electrical connection with the housing. In this way, the housing can be fixed on the printed circuit mainboard, and an electrical connection can be established between the charged detection circuit set on the printed circuit mainboard and the housing, so that the charged detection circuit can detect whether the housing is charged, which can prevent the user from connecting the laser processing equipment to the computer without knowing it, causing damage to the computer and the laser processing equipment, and avoiding property loss.

[0085] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0086] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0087] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0089] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0090] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0091] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0092] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0093] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but the scope of the rights of the present application is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present application should be within the scope of the rights of the present application.

Claims

1. A live detection circuit, arranged on a printed circuit board mainboard of a laser processing device, characterized in that: It includes a first detection circuit and a micro control unit, wherein the micro control unit is connected to the first detection circuit; The first end of the first detection circuit is used to connect to the housing of the laser processing equipment, and the second end of the first detection circuit is used to connect to the first power supply output by the printed circuit board mainboard; The first detection circuit is configured to: if the housing is charged, output a first level signal to the micro control unit; If the housing is not powered, output a second level signal to the micro control unit; The micro control unit is configured to: if the first level signal is received, output a first signal, the first signal is used to indicate that the housing is powered; if the second level signal is received, output a second signal, the second signal is used to indicate that the housing is not powered.

2. The charged detection circuit according to claim 1, characterized in that: The first detection circuit includes a MOS tube switch circuit.

3. The charged detection circuit according to claim 2, characterized in that: The MOS switch circuit comprises: a first resistor, a first capacitor, an NMOS transistor and a second resistor; A first end of the first resistor is connected to the housing, and a second end of the first resistor is connected to the gate of the NMOS transistor; The first end of the first capacitor is connected to the second end of the first resistor and connected to the gate of the NMOS transistor, and the second end of the first capacitor is connected to the source of the NMOS transistor and grounded; The drain of the NMOS transistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the first power supply.

4. The charged detection circuit according to claim 3, characterized in that: The micro control unit is connected between the drain of the NMOS transistor and the first end of the second resistor.

5. The charged detection circuit according to claim 3, characterized in that: The live detection circuit also includes a voltage division protection circuit; A first end of the voltage-dividing protection circuit is connected to the housing, and a second end of the voltage-dividing protection circuit is connected to a first end of the first resistor.

6. The charged detection circuit according to claim 5, characterized in that: The voltage-dividing protection circuit comprises: a third resistor, a fourth resistor and a transient suppression diode; A first end of the third resistor is connected to the housing, and a second end of the third resistor is connected to a first end of the first resistor; The first end of the fourth resistor is connected to the second end of the third resistor, and the second end of the fourth resistor is connected to the first end of the transient suppression diode and then grounded together; The second end of the transient suppression diode is connected between the second end of the third resistor and the first end of the first resistor.

7. The charged detection circuit according to claim 1, characterized in that: The live detection circuit also includes an alarm circuit, and the alarm circuit is connected to the micro control unit; The alarm circuit is configured to: if the first signal is received, drive to sound an alarm; if the second signal is received, do not drive to sound an alarm; The alarm circuit includes at least one of an acoustic alarm circuit, an optical alarm circuit, and an acoustic and optical alarm circuit.

8. The charged detection circuit according to claim 7, characterized in that: The alarm circuit includes a buzzer drive circuit, and the buzzer drive circuit includes a fifth resistor, a triode, a diode and a buzzer; A first end of the fifth resistor is connected to the output end of the micro control unit, and a second end of the fifth resistor is connected to the base of the transistor; The emitter of the transistor is grounded, and the collector of the transistor is connected to the first end of the buzzer; The first end of the diode is connected between the collector of the transistor and the first end of the buzzer, and the second end of the diode is grounded; The second end of the buzzer is connected to an external power source.

9. The charged detection circuit according to claim 8, characterized in that: The buzzer driving circuit also includes a second capacitor and a sixth resistor; The first end of the second capacitor is connected to the second end of the fifth resistor and then connected to the base of the transistor; the second end of the second capacitor is connected to the emitter of the transistor and then grounded; The first end of the sixth resistor is connected to the first end of the second capacitor, and the second end of the sixth resistor is connected to the second end of the second capacitor; and / or, The buzzer driving circuit also includes a third capacitor and a seventh resistor; The first end of the third capacitor is connected to the second end of the diode, and the second end of the third capacitor is grounded; The first end of the seventh resistor is connected to the second end of the buzzer, and the second end of the seventh resistor is connected to the external power supply.

10. A laser processing device, characterized in that: include: Laser processing equipment body; A casing, on which the laser processing equipment body is mounted; A charged detection device, the charged detection device comprising the charged detection circuit according to any one of claims 1 to 9, the charged detection device being electrically connected to the housing, and the charged detection device being configured to detect whether the housing is charged.

11. The laser processing equipment according to claim 10, characterized in that: The laser processing equipment body includes a printed circuit board mainboard, and the charged detection circuit is arranged on the printed circuit board mainboard.

12. The laser processing equipment according to claim 11, characterized in that: The printed circuit board mainboard is provided with a first hole, a fastener passes through the first hole and an end of the fastener contacts the housing, and a first end of the first detection circuit is electrically connected to the housing through the first hole.

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