Intelligent auxiliary power supply circuit for laser and laser device

Abstract

The invention relates to the technical field of switching power supplies, and discloses an intelligent auxiliary power supply circuit for a laser and laser equipment, the intelligent auxiliary power supply circuit for the laser comprises a power supply detection control circuit, a pulse width control circuit, a starting circuit and a power supply conversion output circuit; the input end of the starting circuit is connected with an external power supply; the output control end of the power supply detection control circuit is arranged between the output end of the starting circuit and the power supply end of the pulse width control circuit, and when the power supply detection control circuit detects that an external power supply is powered on, the starting circuit and the pulse width control circuit are electrically connected; when the power supply detection control circuit detects that the external power supply is powered off, the starting circuit and the pulse width control circuit are electrically connected; the pulse width control circuit is used for controlling the power supply conversion output circuit to convert the voltage of the external power supply and output the converted voltage to the laser load when the external power supply is connected. According to the invention, the auxiliary power supply circuit can perform power failure judgment, the starting time is shortened, and the power consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switching power supply, in particular to an intelligent auxiliary power supply circuit for laser and a laser device. BACKGROUND

[0002] The auxiliary power supply of the laser device can supply power to the main control board and the monitoring display screen of the laser and the like. After the laser device is powered on, the main control board and the monitoring display screen first enter a standby state, and after self-checking is normal, the laser pump power loop is set to work.

[0003] The current auxiliary power supply charges the starting capacitor through the starting resistor after the AC input is powered on, and the output end voltage is established after the charging is completed. The boot-up time is long, the starting resistor is in current for a long time, and the power consumption is large. Moreover, after the AC input is powered off, there is no judgment circuit, and the input power-off alarm cannot be reported. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide an intelligent auxiliary power supply circuit for laser and a laser device, so that the auxiliary power supply circuit can perform power-off judgment, reduce the starting time and reduce the power consumption.

[0005] The technical scheme of the present application is as follows: An intelligent auxiliary power supply circuit for laser, comprising: a power detection control circuit, a pulse width control circuit, a starting circuit and a power conversion output circuit; The detection end of the power detection control circuit is used for connecting an external power supply; The input end of the starting circuit is used for connecting an external power supply; The output control end of the power detection control circuit is arranged between the output end of the starting circuit and the power end of the pulse width control circuit, and the power detection control circuit is used for conducting the electrical connection between the starting circuit and the pulse width control circuit when detecting that the external power supply is powered on; The power detection control circuit is also used for disconnecting the electrical connection between the starting circuit and the pulse width control circuit when detecting that the external power supply is powered off; The controlled end of the power conversion output circuit is connected with the output end of the pulse width control circuit, the input end of the power conversion output circuit is used for connecting an external power supply, and the output end of the power conversion output circuit is used for connecting a laser load; The output end of the pulse width control circuit is connected with the controlled end of the power conversion output circuit, and the pulse width control circuit is used for controlling the power conversion output circuit to convert and output the voltage of the external power supply to the laser load when the external power supply is connected.

[0006] Optionally, the intelligent auxiliary power supply circuit for the laser further comprises: an alternating voltage sampling circuit, a sampling end of the alternating voltage sampling circuit being used for connecting an external power supply, the alternating voltage sampling circuit being used for collecting a voltage value of the external power supply and outputting a voltage detection signal; a processor circuit, connected with the alternating voltage sampling circuit and also connected with the pulse width control circuit, the processor circuit being used for performing overvoltage protection when it is determined according to the voltage detection signal that the voltage of the external power supply is higher than an overvoltage threshold value; the processor circuit being used for performing under-voltage protection when it is determined according to the voltage detection signal that the voltage of the external power supply is lower than an under-voltage threshold value; the processor circuit being further used for shutting down the pulse width control circuit when a standby signal is received.

[0007] Optionally, the power supply detection control circuit comprises a first capacitor, a first diode, a sixth resistor, a seventh resistor, an eighth resistor, a third voltage stabilizing diode, a first optocoupler and a third triode, a first end of the first capacitor, an anode of the first diode and a first end of the sixth resistor are interconnected and used for connecting a positive pole of an external power supply, a cathode of the first diode and an input end of the starting circuit are connected, a second end of the first capacitor, a second end of the seventh resistor and a second end of the first optocoupler are interconnected and used for connecting a negative pole of the external power supply, a second end of the sixth resistor, a first end of the seventh resistor and a cathode of the third voltage stabilizing diode are interconnected, an anode of the third voltage stabilizing diode and a first end of the first optocoupler are connected, a third end of the first optocoupler and a base of the third triode are connected, a fourth end of the first optocoupler and a first end of the eighth resistor are connected, a second end of the eighth resistor and a collector of the third triode are connected, and an emitter of the third triode and a power supply end of the pulse width control circuit are connected.

[0008] Optionally, the starting circuit comprises a first resistor, a second resistor and a first MOS tube, a first end of the first resistor and a first end of the second resistor are connected and used for connecting an external power supply, a second end of the first resistor and a drain of the first MOS tube are connected, a second end of the second resistor and a gate of the first MOS tube are connected, and a source of the first MOS tube and an output control end of the power supply detection control circuit are connected.

[0009] Optionally, the intelligent auxiliary power supply circuit for laser also comprises: an output overvoltage protection circuit, the output overvoltage protection circuit comprises a first triode, a second triode, a first zener diode, a second zener diode, a third resistor, a fourth resistor, a fifth resistor and a third capacitor, the cathode of the first zener diode and the collector of the first triode are connected and connected with the gate of the first MOS tube, the anode of the first zener diode and the cathode of the second zener diode are connected and connected with the source of the first MOS tube, the anode of the second zener diode and the first end of the third resistor are connected, the second end of the third resistor, the first end of the fourth resistor and the base of the first triode are connected, the second end of the fourth resistor, the first end of the third capacitor and the first end of the fifth resistor are interconnected, the second end of the fifth resistor and the emitter of the second triode are connected, the collector of the second triode is used for connecting the system power supply, the base of the second triode is connected with the pulse width control circuit, and the second end of the third capacitor and the emitter of the first triode are grounded.

[0010] Optionally, the intelligent auxiliary power supply circuit for laser also comprises: an isolation circuit, the isolation circuit comprises a third diode, the anode of the third diode is connected with the output end of the starting circuit, and the cathode of the third diode is used for connecting the system power supply.

[0011] Optionally, the intelligent auxiliary power supply circuit for laser also comprises: a power input end used for connecting an external power supply, the power input end being connected with the power detection control circuit; a power output end used for connecting a laser load, the power output end being connected with the output end of the power conversion output circuit.

[0012] Optionally, the intelligent auxiliary power supply circuit for laser also comprises: a rectifier circuit, the input end of the rectifier circuit being connected with the power input end, the output end of the rectifier circuit being connected with the power detection control circuit, and the rectifier circuit being used for rectifying the external power supply and outputting to the power detection control circuit.

[0013] Optionally, the intelligent auxiliary power supply circuit for laser also comprises: an overcurrent detection circuit, the detection end of the overcurrent detection circuit being connected with the power output end, the output end of the overcurrent detection circuit being connected with the pulse width control circuit, and the overcurrent detection circuit being used for detecting the output current of the power output end and outputting a current detection signal to the pulse width control circuit.

[0014] The application further provides a laser device comprising a laser load and the intelligent auxiliary power supply circuit for laser as described above, and the laser load is connected with the power conversion output circuit in the intelligent auxiliary power supply circuit for laser.

[0015] The intelligent auxiliary power supply circuit for laser is composed of the power supply detection control circuit, the pulse width control circuit, the starting circuit and the power conversion output circuit, wherein the detection end of the power supply detection control circuit is used for connecting an external power supply; the input end of the starting circuit is used for connecting the external power supply; the output control end of the power supply detection control circuit is arranged between the output end of the starting circuit and the power end of the pulse width control circuit, and the power supply detection control circuit is used for conducting the electrical connection between the starting circuit and the pulse width control circuit when detecting that the external power supply is powered on; the power supply detection control circuit is further used for disconnecting the electrical connection between the starting circuit and the pulse width control circuit when detecting that the external power supply is powered off; the controlled end of the power conversion output circuit is connected with the output end of the pulse width control circuit, the input end of the power conversion output circuit is used for connecting the external power supply, and the output end of the power conversion output circuit is used for connecting a laser load; the output end of the pulse width control circuit is connected with the controlled end of the power conversion output circuit, and the pulse width control circuit is used for controlling the power conversion output circuit to convert and output the voltage of the external power supply to the laser load when the external power supply is connected. Thus, the intelligent auxiliary power supply circuit for laser can shorten the power-on starting time and reduce the circuit loss. Moreover, after the AC input is powered off, the intelligent auxiliary power supply circuit for laser can judge and perform the power-off action. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0017] Figure 1 is a functional module schematic diagram of an embodiment of the intelligent auxiliary power supply circuit for laser.

[0018] Figure 2 is a functional module schematic diagram of another embodiment of the intelligent auxiliary power supply circuit for laser.

[0019] Figure 3 is a circuit structure schematic diagram of an embodiment of the intelligent auxiliary power supply circuit for laser.

[0020] Explanation of reference signs: 10, power supply detection control circuit; 20, pulse width control circuit; 30, starting circuit; 40, power conversion output circuit; 50, alternating voltage sampling circuit; 60, processor circuit; 70, overcurrent detection circuit; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; Q1, first MOS transistor; Q2, first triode; Q3, second triode; Q4, third triode; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; OC1, first optocoupler; D1, first diode; D2, second diode; D3, third diode; ZD1, first zener diode; ZD2, second zener diode; ZD3, third zener diode. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and effects of the present application clearer and more explicit, the present application is further described in detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0022] In the embodiments and the patent application scope, unless the article is specifically limited in the text, "one", "a", "said" and "the" can also include the plural form. If the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0023] It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element is said to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. In addition, "connection" or "coupling" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0024] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0025] In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the application.

[0026] The auxiliary power supply of the laser device can supply power to the load such as the main control board and the monitoring display screen of the laser. After the laser device is started, the main control board and the monitoring display screen first enter a standby state, and after self-checking is normal, the laser pump source power loop is set to work.

[0027] The current auxiliary power supply charges the starting capacitor through the starting resistor after the AC input is powered on, and the output voltage is established after the charging is completed. The power-on start time is long, the starting resistor is long-term current-carrying, and the loss is large. And after the AC input is powered off, there is no judgment circuit, and the input power-off alarm cannot be reported.

[0028] To solve the above problems, the application provides an intelligent auxiliary power supply circuit for laser.

[0029] Reference Figure 1 In an embodiment, the intelligent auxiliary power supply circuit for laser includes a power detection control circuit 10, a pulse width control circuit 20, a starting circuit 30 and a power conversion output circuit 40. The detection end of the power detection control circuit 10 is used for connecting an external power supply; The input end of the starting circuit 30 is used for connecting an external power supply; The output control end of the power detection control circuit 10 is arranged between the output end of the starting circuit 30 and the power end of the pulse width control circuit 20, and the power detection control circuit 10 is used for conducting the electrical connection between the starting circuit 30 and the pulse width control circuit 20 when detecting that the external power supply is powered on; The power detection control circuit 10 is also used for disconnecting the electrical connection between the starting circuit 30 and the pulse width control circuit 20 when detecting that the external power supply is powered off; The controlled end of the power conversion output circuit 40 is connected with the output end of the pulse width control circuit 20, the input end of the power conversion output circuit 40 is used for connecting an external power supply, and the output end of the power conversion output circuit 40 is used for connecting a laser load. The output end of the pulse width control circuit 20 is connected with the controlled end of the power conversion output circuit 40, and the pulse width control circuit 20 is used for controlling the power conversion output circuit 40 to output the voltage of the external power supply to the laser load after conversion when the external power supply is connected.

[0030] In the embodiment, the output control end of the power detection control circuit 10 is arranged between the output end of the starting circuit 30 and the power end of the pulse width control circuit 20, so that the power detection control circuit 10 can turn on the electrical connection between the starting circuit 30 and the pulse width control circuit 20 when detecting that the external power supply is powered on; the pulse width control circuit 20 is powered on and can work normally to control the power conversion output circuit 40 to output the external power supply to the laser load after conversion. The power detection control circuit 10 can also disconnect the electrical connection between the starting circuit 30 and the pulse width control circuit 20 when detecting that the external power supply is powered off, at which time the pulse width control circuit 20 is powered off and cannot work normally to control the power conversion output circuit 40 to output the external power supply to the laser load after conversion; thus, the power-off control is realized. The starting circuit 30 is arranged to directly output the external power supply to the pulse width control circuit 20 through the starting circuit 30 when the external power supply is powered on, so that the pulse width control circuit 20 can work. The controlled end of the power conversion output circuit 40 is connected with the output end of the pulse width control circuit 20, the input end of the power conversion output circuit 40 is connected with the external power supply, the output end of the power conversion output circuit 40 is connected with the laser load, and the power conversion circuit can be composed of a transformer, which outputs the external power supply to the laser load after conversion through the transformer. The specific transformer conversion ratio can be set according to the actual situation and user demand, and the specific transformer circuit structure can be referred to Figure 3 The controlled end of the power conversion output circuit 40 is connected with the output end of the pulse width control circuit 20, the input end of the power conversion output circuit 40 is used for connecting an external power supply, and the output end of the power conversion output circuit 40 is used for connecting a laser load.

[0031] The intelligent auxiliary power supply circuit for laser is composed of a power supply detection control circuit 10, a pulse width control circuit 20, a starting circuit 30 and a power conversion output circuit 40. The detection end of the power supply detection control circuit 10 is used for connecting an external power supply. The input end of the starting circuit 30 is used for connecting the external power supply. The output control end of the power supply detection control circuit 10 is arranged between the output end of the starting circuit 30 and the power supply end of the pulse width control circuit 20. The power supply detection control circuit 10 is used for conducting the electrical connection between the starting circuit 30 and the pulse width control circuit 20 when detecting that the external power supply is powered on. The power supply detection control circuit 10 is also used for disconnecting the electrical connection between the starting circuit 30 and the pulse width control circuit 20 when detecting that the external power supply is powered off. The controlled end of the power conversion output circuit 40 is connected with the output end of the pulse width control circuit 20. The input end of the power conversion output circuit 40 is used for connecting the external power supply. The output end of the power conversion output circuit 40 is used for connecting a laser load. The output end of the pulse width control circuit 20 is connected with the controlled end of the power conversion output circuit 40. The pulse width control circuit 20 is used for controlling the power conversion output circuit 40 to convert and output the voltage of the external power supply to the laser load when the external power supply is connected. Thus, the intelligent auxiliary power supply circuit for laser can shorten the power-on starting time and reduce the circuit loss. After the AC input is powered off, the intelligent auxiliary power supply circuit for laser can judge and perform the power-off action.

[0032] Reference Figure 2 In an embodiment, the intelligent auxiliary power supply circuit for laser further comprises: An AC voltage sampling circuit 50, the sampling end of the AC voltage sampling circuit 50 is used for connecting an external power supply. The AC voltage sampling circuit 50 is used for collecting the voltage value of the external power supply and outputting a voltage detection signal. A processor circuit 60, connected with the AC voltage sampling circuit 50 and also connected with the pulse width control circuit 20. The processor circuit 60 is used for performing overvoltage protection when determining that the voltage of the external power supply is higher than an overvoltage threshold value according to the voltage detection signal. The processor circuit 60 is used for performing under-voltage protection when determining that the voltage of the external power supply is lower than an under-voltage threshold value according to the voltage detection signal. The processor circuit 60 is also used for closing the pulse width control circuit 20 when receiving a standby signal.

[0033] In this embodiment, the alternating voltage sampling circuit 50 can be composed of a sampling resistor. The alternating voltage sampling circuit 50 can collect the voltage value of the external power supply and output a voltage detection signal to the processor circuit 60. The processor circuit 60 can include a processor, which can be a digital signal processor (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a microprocessor, an MCU, or other electronic components. The processor circuit 60 can determine, according to the voltage detection signal, whether the voltage of the external power supply is higher than an overvoltage threshold value, and perform overvoltage protection. The processor circuit 60 can also determine, according to the voltage detection signal, whether the voltage of the external power supply is lower than an undervoltage threshold value, and perform undervoltage protection. The specific overvoltage threshold value and undervoltage threshold value can be set according to actual conditions and user requirements. In addition, the processor circuit 60 can also turn off the pulse width control circuit 20 when receiving a standby signal output by other control devices in the laser device. The processor circuit 60 can also set more protection functions, such as open-phase protection and power failure alarm, according to user requirements.

[0034] Reference Figure 3 In an embodiment, the power supply detection control circuit 10 includes a first capacitor C1, a first diode D1, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third zener diode ZD3, a first optocoupler OC1, and a third transistor Q4. The first end of the first capacitor C1, the anode of the first diode D1, and the first end of the sixth resistor R6 are interconnected and used to connect the positive pole of the external power supply. The cathode of the first diode D1 is connected to the input end of the start-up circuit 30. The second end of the first capacitor C1, the second end of the seventh resistor R7, and the second end of the first optocoupler OC1 are interconnected and used to connect the negative pole of the external power supply. The second end of the sixth resistor R6, the first end of the seventh resistor R7, and the cathode of the third zener diode ZD3 are interconnected. The anode of the third zener diode ZD3 is connected to the first end of the first optocoupler OC1. The third end of the first optocoupler OC1 is connected to the base of the third transistor Q4. The fourth end of the first optocoupler OC1 is connected to the first end of the eighth resistor R8. The second end of the eighth resistor R8 is connected to the collector of the third transistor Q4. The emitter of the third transistor Q4 is connected to the power supply end of the pulse width control circuit 20.

[0035] The starting circuit 30 comprises a first resistor R1, a second resistor R2 and a first MOS Q1, the first end of the first resistor R1 and the first end of the second resistor R2 are connected, and are used for connecting an external power supply, the second end of the first resistor R1 and the drain of the first MOS Q1 are connected, the second end of the second resistor R2 and the gate of the first MOS Q1 are connected, the source of the first MOS Q1 and the output control end of the power supply detection control circuit 10 are connected.

[0036] The intelligent auxiliary power supply circuit for laser also comprises an output overvoltage protection circuit, the output overvoltage protection circuit comprises a first triode Q2, a second triode Q3, a first zener diode ZD1, a second zener diode ZD2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a third capacitor C3, the cathode of the first zener diode ZD1 and the collector of the first triode Q2 are connected, and are connected with the gate of the first MOS Q1, the anode of the first zener diode ZD1 and the cathode of the second zener diode ZD2 are connected, and are connected with the source of the first MOS Q1, the anode of the second zener diode ZD2 and the first end of the third resistor R3 are connected, the second end of the third resistor R3, the first end of the fourth resistor R4 and the base of the first triode Q2 are connected, the second end of the fourth resistor R4, the first end of the third capacitor C3 and the first end of the fifth resistor R5 are interconnected, the second end of the fifth resistor R5 and the emitter of the second triode Q3 are connected, the collector of the second triode Q3 is used for connecting a system power supply, the base of the second triode Q3 is connected with the pulse width control circuit 20, and the second end of the third capacitor C3 and the emitter of the first triode Q2 are grounded.

[0037] The intelligent auxiliary power supply circuit for laser also comprises an isolation circuit, the isolation circuit comprises a third diode D3, the anode of the third diode D3 is connected with the output end of the starting circuit 30, and the cathode of the third diode D3 is used for connecting a system power supply.

[0038] In this embodiment, when the external power supply is powered on, the sixth resistor R6 and the seventh resistor R7 connected with the first capacitor C1 divide the voltage of the external power supply, and then supply power to the internal primary diode of the third stable voltage diode ZD3 to the first optocoupler OC1. The internal triode is turned on, which represents input power-on. The third triode Q4 is turned on, and the pulse width control circuit 20 can start normal work. Because the capacity of the first capacitor C1 is small, the discharge time constant of the first capacitor C1, the sixth resistor R6 and the seventh resistor R7 is set to 2.5 seconds, and the specific time can also be set according to the actual situation and user demand; after the input external power supply is powered off, the voltage on the first capacitor C1 is discharged through the sixth resistor R6 and the seventh resistor R7 for 2.5 seconds, and the voltage is lower than the turn-on voltage of the third stable voltage diode ZD3. The internal primary diode of the first optocoupler OC1 is cut off, the internal triode is turned off, which represents input power-off. The third triode Q4 is cut off, the pulse width control circuit 20 is powered off, the output is stopped, the VO+ and Vmcu+ voltages are zero, the system power supply has no current, the first resistor R1 and the first MOS tube Q1 are in the no-load standby state without current, and there is no loss. The eighth resistor R8 can limit the current to prevent damage to the device. Figure 3 The Vmcu+ and Vmcu- are connection terminals of the processor circuit 60.

[0039] It should be noted that if the processor is directly used to collect the input alternating voltage, the judgment logic of the processor will be contradictory to the power supply logic. Because after the input power is powered off, the processor turns off the pulse width control circuit 20, and at this time the voltage of the VO+ and Vmcu+ ports is zero. If the power supply of the processor is Vmcu+, the voltage of Vmcu+ is 0V, the processor will be invalid and will release the control. The capacity of the second capacitor C2 is large, and the stored charge is more. There is no discharge circuit, and the auxiliary power supply circuit will restart to supply power to the processor. Then the processor detects that there is no input voltage and turns off, and the cycle continues until the charge on the second capacitor C2 is discharged to the auxiliary power supply circuit and cannot start. The present scheme sets a discharge circuit for the second capacitor C2, and will not cause the processor circuit 60 to restart work when the external power supply is powered off.

[0040] Further, the first resistor R1 in the embodiment is a starting resistor, the first MOS tube Q1 works in a linear regulation state, the second resistor R2 is a gate power supply resistor of the first MOS tube Q1, and the fourth capacitor C4 is an energy storage filter starting capacitor. After the third transistor Q4 is turned on, the pulse width control circuit 20 is powered on, outputs a PWM drive signal, and the VO+ end outputs normally. The pulse width control circuit 20 outputs an OFF high-level signal to the base of the second transistor Q3, the second transistor Q3 is turned on, the system power supply is delayed through the second transistor Q3, the fifth resistor R5 and the third capacitor C3, drives the fourth resistor R4 to turn on the first transistor Q2, pulls down the gate voltage of the first MOS tube Q1, and turns off the first MOS tube Q1, so as to reduce the loss of the first resistor R1 and the first MOS tube Q1. It can be understood that, at the moment of starting, the first resistor R1 and the first MOS tube Q1 supply power to the pulse width control circuit 20. After the circuit is started and outputs normally, the first MOS tube Q1 is turned off, and the first resistor R1 and the first MOS tube Q1 have no loss. Moreover, after the circuit is started and outputs normally, the transformer winding is rectified through the second diode D2, and the system power supply is output after being filtered by the fourth capacitor C4, while in the starting process, the system power supply gradually rises from low to normal supply voltage.

[0041] The third diode D3 is an isolation diode, which can prevent the system power supply voltage from flowing back to the source of the first MOS tube Q1 after the auxiliary power supply circuit works, so as to avoid the misoperation of the second voltage stabilizing diode ZD2, the third resistor R3 and the first transistor Q2 circuit. The first voltage stabilizing diode ZD1 is a gate protection voltage stabilizing diode of the first MOS tube Q1, the second voltage stabilizing diode ZD2, the third resistor R3 and the first transistor Q2 are an output overvoltage protection circuit of the first MOS tube Q1, and when the source output voltage of the first MOS tube Q1 exceeds the conduction voltage of the second voltage stabilizing diode ZD2, the first transistor Q2 is turned on, the gate voltage of the first MOS tube Q1 is pulled down, the source output voltage of the first MOS tube Q1 is reduced, and the fourth capacitor C4 is protected from overvoltage failure.

[0042] In an embodiment, the intelligent auxiliary power supply circuit for laser also includes: a power input end for connecting an external power supply, the power input end being connected with the power detection control circuit 10; a power output end for connecting a laser load, the power output end being connected with the output end of the power conversion output circuit 40.

[0043] In the embodiment, the power input end and the power output end can be power supply interfaces, and the specific interface model can be selected according to actual conditions and user requirements. The power input end and the power output end can play the role of electrical isolation and adaptation for electronic components in the intelligent auxiliary power supply circuit for laser.

[0044] Referring to Figure 3 In an embodiment, the intelligent auxiliary power supply circuit for laser includes: a rectifier circuit, an input end of the rectifier circuit being connected with the power supply input end, an output end of the rectifier circuit being connected with the power supply detection control circuit 10, the rectifier circuit being used for rectifying an external power supply and outputting to the power supply detection control circuit 10.

[0045] In the embodiment, the external power supply is connected to the first capacitor C1 after being rectified by six diodes, and the power is supplied to the power conversion of the auxiliary power supply circuit through the second capacitor C2 after being filtered and stored by the first diode D1. The number of diodes in the rectifier circuit can also be set according to actual conditions and user needs.

[0046] Referring to Figure 3 In an embodiment, the intelligent auxiliary power supply circuit for laser includes: an overcurrent detection circuit 70, a detection end of the overcurrent detection circuit 70 being connected with the power supply output end, an output end of the overcurrent detection circuit 70 being connected with the pulse width control circuit 20, the overcurrent detection circuit 70 being used for detecting an output current of the power supply output end and outputting a current detection signal to the pulse width control circuit 20.

[0047] In the embodiment, the overcurrent detection circuit 70 can sample and detect the current output to the laser load through the ninth resistor R9 connected with the power supply output end, and output a current detection signal to the pulse width control circuit 20. The pulse width control circuit 20 can determine the size of the current output to the laser load according to the current detection signal, and control the power conversion output circuit 40 when the output current is too large, so that the output current is kept within a safe range.

[0048] The present application also provides a laser device.

[0049] In an embodiment, the laser device includes a laser load and an intelligent auxiliary power supply circuit for laser as described above, the laser load being connected with the power conversion output circuit 40 in the intelligent auxiliary power supply circuit for laser. It can be understood that, since the above-mentioned intelligent auxiliary power supply circuit for laser is used in the laser device of the present application, the embodiments of the laser device of the present application include all the technical solutions of all the embodiments of the above-mentioned intelligent auxiliary power supply circuit for laser, and the technical effects achieved are also completely the same, which will not be described here.

[0050] It should be understood that the application of the present application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the claims of the present application.

Claims

1. An intelligent auxiliary power supply circuit for a laser, characterized by, The power supply detection control circuit, the pulse width control circuit, the starting circuit and the power conversion output circuit are included. The detection end of the power supply detection control circuit is used for connecting an external power supply. The input end of the starting circuit is used for connecting an external power supply. The output control end of the power supply detection control circuit is arranged between the output end of the starting circuit and the power end of the pulse width control circuit, and the power supply detection control circuit is used for turning on the electrical connection between the starting circuit and the pulse width control circuit when detecting that the external power supply is powered on. The power supply detection control circuit is also used for turning off the electrical connection between the starting circuit and the pulse width control circuit when detecting that the external power supply is powered off. The controlled end of the power conversion output circuit is connected with the output end of the pulse width control circuit, the input end of the power conversion output circuit is used for connecting an external power supply, and the output end of the power conversion output circuit is used for connecting a laser load. The output end of the pulse width control circuit is connected with the controlled end of the power conversion output circuit, and the pulse width control circuit is used for controlling the power conversion output circuit to convert and output the voltage of the external power supply to the laser load when the external power supply is connected. The AC voltage sampling circuit, the processor circuit, the overvoltage protection, the undervoltage protection and the standby signal are further included.

2. The intelligent auxiliary power supply circuit for a laser as recited in claim 1, wherein, The sampling end of the AC voltage sampling circuit is used for connecting an external power supply, and the AC voltage sampling circuit is used for collecting the voltage value of the external power supply and outputting a voltage detection signal. The processor circuit is connected with the AC voltage sampling circuit and the pulse width control circuit, and is used for performing overvoltage protection when determining that the voltage of the external power supply is higher than an overvoltage threshold value according to the voltage detection signal. The processor circuit is used for performing undervoltage protection when determining that the voltage of the external power supply is lower than an undervoltage threshold value according to the voltage detection signal. The processor circuit is also used for shutting down the pulse width control circuit when receiving a standby signal. The power supply detection control circuit includes a first capacitor, a first diode, a sixth resistor, a seventh resistor, an eighth resistor, a third voltage stabilizing diode, a first optocoupler and a third triode, the first end of the first capacitor, the anode of the first diode and the first end of the sixth resistor are interconnected and used for connecting the positive pole of an external power supply, the cathode of the first diode is connected with the input end of the starting circuit, the second end of the first capacitor, the second end of the seventh resistor and the second end of the first optocoupler are interconnected and used for connecting the negative pole of the external power supply, the second end of the sixth resistor, the first end of the seventh resistor and the cathode of the third voltage stabilizing diode are interconnected, the anode of the third voltage stabilizing diode is connected with the first end of the first optocoupler, the third end of the first optocoupler is connected with the base of the third triode, the fourth end of the first optocoupler is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the collector of the third triode, and the emitter of the third triode is connected with the power end of the pulse width control circuit.

3. The intelligent auxiliary power supply circuit for a laser as recited in claim 1, wherein, ​ 4. The intelligent auxiliary power supply circuit for a laser as defined in claim 1, wherein, The starting circuit comprises a first resistor, a second resistor and a first MOS tube, the first end of the first resistor and the first end of the second resistor are connected, and are used for connecting an external power supply, the second end of the first resistor and the drain of the first MOS tube are connected, the second end of the second resistor and the gate of the first MOS tube are connected, and the source of the first MOS tube and the output control end of the power supply detection control circuit are connected.

5. The intelligent auxiliary power supply circuit for a laser as recited in claim 4, wherein, Further comprising: An output overvoltage protection circuit, the output overvoltage protection circuit comprises a first transistor, a second transistor, a first zener diode, a second zener diode, a third resistor, a fourth resistor, a fifth resistor and a third capacitor, the cathode of the first zener diode and the collector of the first transistor are connected, and are connected with the gate of the first MOS tube, the anode of the first zener diode and the cathode of the second zener diode are connected, and are connected with the source of the first MOS tube, the anode of the second zener diode and the first end of the third resistor are connected, the second end of the third resistor, the first end of the fourth resistor and the base of the first transistor are connected, the second end of the fourth resistor, the first end of the third capacitor and the first end of the fifth resistor are interconnected, the second end of the fifth resistor and the emitter of the second transistor are connected, the collector of the second transistor is used for connecting a system power supply, the base of the second transistor is connected with the pulse width control circuit, and the second end of the third capacitor and the emitter of the first transistor are grounded.

6. The intelligent auxiliary power supply circuit for a laser as recited in claim 1, wherein, Further comprising: An isolation circuit, the isolation circuit comprises a third diode, the anode of the third diode is connected with the output end of the starting circuit, and the cathode of the third diode is used for connecting a system power supply.

7. The intelligent auxiliary power supply circuit for a laser as defined in claim 1, wherein, Further comprising: A power input end for connecting an external power supply, the power input end is connected with the power supply detection control circuit; A power output end for connecting a laser load, the power output end is connected with the output end of the power conversion output circuit.

8. The intelligent auxiliary power supply circuit for a laser as defined in claim 7, wherein, Further comprising: A rectifier circuit, the input end of the rectifier circuit is connected with the power input end, the output end of the rectifier circuit is connected with the power supply detection control circuit, and the rectifier circuit is used for rectifying the external power supply and outputting to the power supply detection control circuit.

9. The intelligent auxiliary power supply circuit for a laser as recited in claim 7, wherein, Further comprising: An overcurrent detection circuit, the detection end of the overcurrent detection circuit is connected with the power output end, the output end of the overcurrent detection circuit is connected with the pulse width control circuit, and the overcurrent detection circuit is used for detecting the output current of the power output end and outputting a current detection signal to the pulse width control circuit.

10. A laser device, characterized by comprising: A laser load and the intelligent auxiliary power supply circuit for laser as claimed in any one of claims 1-9, the laser load is connected with the power conversion output circuit in the intelligent auxiliary power supply circuit for laser.

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