Intelligent auxiliary power supply circuit for laser and laser device

Abstract

The application relates to the technical field of switching power supply, and discloses an intelligent auxiliary power supply circuit for a laser and a laser device.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 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; when the power supply detection control circuit detects that the external power supply is powered on, the electrical connection between the starting circuit and the pulse width control circuit is turned on; when the power supply detection control circuit detects that the external power supply is powered off, the electrical connection between the starting circuit and the pulse width control circuit is turned off; the pulse width control circuit is used for controlling the power supply conversion output circuit to output the voltage of the external power supply to a laser load after conversion when the external power supply is connected. The application enables the auxiliary power supply circuit to perform power-off judgment, reduces the starting time and lowers the power consumption.

Description

Technical Field

[0001] This invention relates to the field of switching power supply technology, and more particularly to an intelligent auxiliary power supply circuit and laser device for lasers. Background Technology

[0002] The auxiliary power supply for the laser equipment can power the main control board and monitoring display screen of the laser. After the laser equipment is powered on, the main control board and monitoring display screen first enter standby mode. After the self-test is normal, the laser pump source power circuit is then set to work.

[0003] The current auxiliary power supply charges the starting capacitor via a starting resistor after AC input is applied, and the output voltage is established after charging is complete. This results in a long power-on time, and the starting resistor carries current for an extended period, leading to significant losses. Furthermore, there is no detection circuitry to detect AC input power failure and therefore no input power failure alarm is reported. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an intelligent auxiliary power supply circuit and laser device for lasers, which enables the auxiliary power supply circuit to detect power failure, reduce startup time, and lower power consumption.

[0005] The technical solution of the present invention is as follows: A smart auxiliary power supply circuit for lasers includes: a power detection and control circuit, a pulse width control circuit, a startup circuit, and a power conversion and output circuit; The detection terminal of the power detection and control circuit is used to connect to an external power source; The input terminal of the startup circuit is used to connect to an external power source; The output control terminal of the power detection and control circuit is located between the output terminal of the startup circuit and the power terminal of the pulse width control circuit. The power detection and control circuit is used to conduct the electrical connection between the startup circuit and the pulse width control circuit when an external power supply is detected to be powered on. The power detection and control circuit is also used to disconnect the electrical connection between the startup circuit and the pulse width control circuit when an external power failure is detected. The controlled terminal of the power conversion output circuit is connected to the output terminal of the pulse width control circuit. The input terminal of the power conversion output circuit is used to connect to an external power supply, and the output terminal of the power conversion output circuit is used to connect to a laser load. The output terminal of the pulse width control circuit is connected to the controlled terminal of the power conversion output circuit. The pulse width control circuit is used to control the power conversion output circuit to convert the voltage of the external power supply and output it to the laser load when an external power supply is connected.

[0006] Optionally, the intelligent auxiliary power supply circuit for the laser also includes: An AC voltage sampling circuit is provided, wherein the sampling terminal of the AC voltage sampling circuit is used to connect to an external power supply, and the AC voltage sampling circuit is used to acquire the voltage value of the external power supply and output a voltage detection signal. The processor circuit is connected to the AC voltage sampling circuit and also to the pulse width control circuit. The processor circuit is used to perform overvoltage protection when the external power supply voltage is higher than the overvoltage threshold based on the voltage detection signal. The processor circuit is used to determine, based on the voltage detection signal, that when the external power supply voltage is lower than the undervoltage threshold, it performs undervoltage protection. The processor circuit is also used to turn off the pulse width control circuit when a standby signal is received.

[0007] Optionally, the power detection and control circuit includes a first capacitor, a first diode, a sixth resistor, a seventh resistor, an eighth resistor, a third Zener diode, a first optocoupler, and a third transistor. The first terminal of the first capacitor, the anode of the first diode, and the first terminal of the sixth resistor are interconnected and used to connect to the positive terminal of an external power supply. The cathode of the first diode is connected to the input terminal of the startup circuit. The second terminal of the first capacitor, the second terminal of the seventh resistor, and the second terminal of the first optocoupler are interconnected and used to connect to the negative terminal of an external power supply. The second terminal of the sixth resistor, the first terminal of the seventh resistor, and the cathode of the third Zener diode are interconnected. The anode of the third Zener diode is connected to the first terminal of the first optocoupler. The third terminal of the first optocoupler is connected to the base of the third transistor. The fourth terminal of the first optocoupler is connected to the first terminal of the eighth resistor. The second terminal of the eighth resistor is connected to the collector of the third transistor. The emitter of the third transistor is connected to the power supply terminal of the pulse width control circuit.

[0008] Optionally, the startup circuit includes a first resistor, a second resistor, and a first MOSFET. The first end of the first resistor and the first end of the second resistor are connected and used to connect to an external power supply. The second end of the first resistor is connected to the drain of the first MOSFET. The second end of the second resistor is connected to the gate of the first MOSFET. The source of the first MOSFET is connected to the output control terminal of the power detection and control circuit.

[0009] Optionally, the intelligent auxiliary power supply circuit for the laser further includes: an output overvoltage protection circuit, the output overvoltage protection circuit including 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 is connected to the collector of the first transistor and to the gate of the first MOSFET. The anode of the first Zener diode is connected to the cathode of the second Zener diode and to the source of the first MOSFET. The anode of the second Zener diode is connected to the first terminal of the third resistor. The second terminal of the third resistor, the first terminal of the fourth resistor, and the base of the first transistor are connected. The second terminal of the fourth resistor, the first terminal of the third capacitor, and the first terminal of the fifth resistor are interconnected. The second terminal of the fifth resistor is connected to the emitter of the second transistor. The collector of the second transistor is used to connect to the system power supply. The base of the second transistor is connected to the pulse width control circuit. The second terminal of the third capacitor and the emitter of the first transistor are grounded.

[0010] Optionally, the intelligent auxiliary power supply circuit for the laser further includes an isolation circuit, the isolation circuit including a third diode, the anode of the third diode being connected to the output terminal of the startup circuit, and the cathode of the third diode being used to connect to the system power supply.

[0011] Optionally, the intelligent auxiliary power supply circuit for the laser also includes: A power input terminal is used to connect to an external power source, and the power input terminal is connected to the power detection and control circuit. The power output terminal is used to connect to the laser load, and the power output terminal is connected to the output terminal of the power conversion output circuit.

[0012] Optionally, the intelligent auxiliary power supply circuit for the laser also includes: A rectifier circuit, wherein the input terminal of the rectifier circuit is connected to the power input terminal, and the output terminal of the rectifier circuit is connected to the power detection and control circuit, and the rectifier circuit is used to rectify the external power supply and output it to the power detection and control circuit.

[0013] Optionally, the intelligent auxiliary power supply circuit for the laser also includes: An overcurrent detection circuit is provided, wherein the detection terminal of the overcurrent detection circuit is connected to the power supply output terminal, and the output terminal of the overcurrent detection circuit is connected to the pulse width control circuit. The overcurrent detection circuit is used to detect the output current of the power supply output terminal and output a current detection signal to the pulse width control circuit.

[0014] The present invention also proposes a laser device, including a laser load and a smart auxiliary power supply circuit for a laser as described above, wherein the laser load is connected to a power conversion output circuit in the smart auxiliary power supply circuit for a laser.

[0015] This invention provides an intelligent auxiliary power supply circuit for lasers, comprising a power detection and control circuit, a pulse width control circuit, a startup circuit, and a power conversion output circuit. The detection terminal of the power detection and control circuit is connected to an external power source; the input terminal of the startup circuit is also connected to an external power source; the output control terminal of the power detection and control circuit is located between the output terminal of the startup circuit and the power supply terminal of the pulse width control circuit. The power detection and control circuit establishes the electrical connection between the startup circuit and the pulse width control circuit when an external power source is detected to be powered on, and disconnects the connection when an external power source is detected to be powered off. The controlled terminal of the power conversion output circuit is connected to the output terminal of the pulse width control circuit. The input terminal of the power conversion output circuit is connected to an external power source, and the output terminal is connected to the laser load. The output terminal of the pulse width control circuit is connected to the controlled terminal of the power conversion output circuit. When an external power source is connected, the pulse width control circuit controls the power conversion output circuit to convert the voltage of the external power source and output it to the laser load. This intelligent auxiliary power supply circuit for lasers provides a short power-on start-up time and reduces circuit losses. Furthermore, it can detect and perform a power-off action after the AC input is lost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

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

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

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

[0020] Figure reference numerals: 10, Power supply detection and control circuit; 20, Pulse width control circuit; 30, Start-up circuit; 40, Power conversion output circuit; 50, AC 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 MOSFET; Q2, First transistor; Q3, Second transistor; Q4, Third transistor; 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 Implementation

[0021] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of the present invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0023] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, 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 referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0024] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0025] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0026] The auxiliary power supply for the laser equipment can power the main control board and monitoring display screen of the laser. After the laser equipment is powered on, the main control board and monitoring display screen first enter standby mode. After the self-test is normal, the laser pump source power circuit is then set to work.

[0027] The current auxiliary power supply charges the starting capacitor via a starting resistor after AC input is applied, and the output voltage is established after charging is complete. This results in a long power-on time, and the starting resistor carries current for an extended period, leading to significant losses. Furthermore, there is no detection circuitry to detect AC input power failure and therefore no input power failure alarm is reported.

[0028] To address the above problems, this invention proposes an intelligent auxiliary power supply circuit for lasers.

[0029] Reference Figure 1 In one embodiment, the intelligent auxiliary power supply circuit for the laser includes: a power detection and control circuit 10, a pulse width control circuit 20, a startup circuit 30, and a power conversion output circuit 40; The detection terminal of the power detection and control circuit 10 is used to connect to an external power source; The input terminal of the startup circuit 30 is used to connect to an external power source; The output control terminal of the power detection and control circuit 10 is located between the output terminal of the startup circuit 30 and the power terminal of the pulse width control circuit 20. The power detection and control circuit 10 is used to conduct the electrical connection between the startup circuit 30 and the pulse width control circuit 20 when an external power supply is detected to be powered on. The power detection and control circuit 10 is also used to disconnect the electrical connection between the startup circuit 30 and the pulse width control circuit 20 when an external power failure is detected. The controlled terminal of the power conversion output circuit 40 is connected to the output terminal of the pulse width control circuit 20. The input terminal of the power conversion output circuit 40 is used to connect to an external power supply, and the output terminal of the power conversion output circuit 40 is used to connect to a laser load. The output terminal of the pulse width control circuit 20 is connected to the controlled terminal of the power conversion output circuit 40. The pulse width control circuit 20 is used to control the power conversion output circuit 40 to convert the voltage of the external power supply and output it to the laser load when an external power supply is connected.

[0030] In this embodiment, the output control terminal of the power detection control circuit 10 is located between the output terminal of the startup circuit 30 and the power supply terminal of the pulse width control circuit 20. Thus, when the power detection control circuit 10 detects an external power supply, it connects the startup circuit 30 and the pulse width control circuit 20. The pulse width control circuit 20, when powered on, can operate normally, controlling the power conversion output circuit 40 to convert the external power supply and output it to the laser load. Alternatively, when the power supply is detected to be off, the power detection control circuit 10 disconnects the connection between the startup circuit 30 and the pulse width control circuit 20. In this case, the pulse width control circuit 20 is also off and cannot operate normally, thus preventing the power conversion output circuit 40 from converting the external power supply and outputting it to the laser load; this achieves power-off control. The startup circuit 30 allows the external power supply to be directly output to the pulse width control circuit 20 when the external power supply is on, enabling the pulse width control circuit 20 to operate. Connect the controlled terminal of the power conversion output circuit 40 to the output terminal of the pulse width control circuit 20. Connect the input terminal of the power conversion output circuit 40 to an external power supply. Connect the output terminal of the power conversion output circuit 40 to the laser load. The power conversion circuit can be constructed using a transformer. The transformer steps up or steps down the external power supply before outputting it to the laser load. The specific transformer conversion ratio can be set according to the actual situation and user requirements. The specific transformer circuit structure can be found by referring to... Figure 3 The settings are configured such that VO+ and VO- are the positive and negative terminals connected to the laser load. The output of the pulse width control circuit 20 is connected to the controlled terminal of the power conversion output circuit 40. When an external power source is connected, the power detection control circuit 10 outputs a high-level electrical signal to the pulse width control circuit 20, which then controls the power conversion output circuit 40 to convert the external power and output it to the laser load. Conversely, when the external power source fails, the power detection control circuit 10 outputs a low-level electrical signal to the pulse width control circuit 20, which then controls the power conversion output circuit 40 to stop converting the external power and outputting it to the laser load.

[0031] The technical solution of this invention comprises a power detection and control circuit 10, a pulse width control circuit 20, a startup circuit 30, and a power conversion output circuit 40, forming an intelligent auxiliary power supply circuit for a laser. The detection terminal of the power detection and control circuit 10 is used to connect to an external power supply; the input terminal of the startup circuit 30 is also used to connect to an external power supply; the output control terminal of the power detection and control circuit 10 is located between the output terminal of the startup circuit 30 and the power supply terminal of the pulse width control circuit 20. The power detection and control circuit 10 is used to establish the electrical connection between the startup circuit 30 and the pulse width control circuit 20 when an external power supply is detected. The control circuit 10 is also used to disconnect the electrical connection between the startup circuit 30 and the pulse width control circuit 20 when an external power failure is detected. The controlled terminal of the power conversion output circuit 40 is connected to the output terminal of the pulse width control circuit 20. The input terminal of the power conversion output circuit 40 is used to connect to the external power supply, and the output terminal of the power conversion output circuit 40 is used to connect to the laser load. The output terminal of the pulse width control circuit 20 is connected to the controlled terminal of the power conversion output circuit 40. The pulse width control circuit 20 is used to control the power conversion output circuit 40 to convert the voltage of the external power supply and output it to the laser load when an external power supply is connected. In this way, the intelligent auxiliary power supply circuit for the laser in this solution can shorten the power-on startup time and reduce circuit losses. Furthermore, it can judge and perform a power-off action after the AC input power failure.

[0032] Reference Figure 2 In one embodiment, the intelligent auxiliary power supply circuit for the laser further includes: An AC voltage sampling circuit 50 is provided, wherein the sampling terminal of the AC voltage sampling circuit 50 is used to connect to an external power supply, and the AC voltage sampling circuit 50 is used to acquire the voltage value of the external power supply and output a voltage detection signal. The processor circuit 60 is connected to the AC voltage sampling circuit 50 and the pulse width control circuit 20. The processor circuit 60 is used to perform overvoltage protection when the external power supply voltage is higher than the overvoltage threshold based on the voltage detection signal. The processor circuit 60 is used to determine, based on the voltage detection signal, that when the external power supply voltage is lower than the undervoltage threshold, it performs undervoltage protection. The processor circuit 60 is also used to turn off the pulse width control circuit 20 when a standby signal is received.

[0033] In this embodiment, the AC voltage sampling circuit 50 can be composed of sampling resistors. The AC voltage sampling circuit 50 can acquire 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, based on the voltage detection signal, that the external power supply voltage is higher than an overvoltage threshold and perform overvoltage protection; it can also determine, based on the voltage detection signal, that the external power supply voltage is lower than an undervoltage threshold and perform undervoltage protection. The specific overvoltage and undervoltage thresholds can be set according to actual conditions and user requirements. Additionally, the processor circuit 60 can also shut down the pulse width control circuit 20 when it receives a standby signal from other control devices in the laser device. The processor circuit 60 can also be configured with more protection functions according to user needs, such as phase loss protection and power failure alarm functions.

[0034] Reference Figure 3 In one embodiment, the power detection and 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 terminal of the first capacitor C1, the anode of the first diode D1, and the first terminal of the sixth resistor R6 are interconnected and used to connect to the positive terminal of an external power supply. The cathode of the first diode D1 is connected to the input terminal of the startup circuit 30. The second terminal of the first capacitor C1, the second terminal of the seventh resistor R7, and the second terminal of the first optocoupler OC1 are interconnected. It is used to connect to the negative terminal of an 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 terminal of the pulse width control circuit 20.

[0035] The startup circuit 30 includes a first resistor R1, a second resistor R2, and a first MOSFET Q1. The first end of the first resistor R1 and the first end of the second resistor R2 are connected and used to connect to an external power supply. The second end of the first resistor R1 is connected to the drain of the first MOSFET Q1. The second end of the second resistor R2 is connected to the gate of the first MOSFET Q1. The source of the first MOSFET Q1 is connected to the output control terminal of the power detection and control circuit 10.

[0036] The intelligent auxiliary power supply circuit for the laser also includes an output overvoltage protection circuit. This circuit comprises a first transistor Q2, a second transistor 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 is connected to the collector of the first transistor Q2 and to the gate of the first MOSFET Q1. The anode of the first Zener diode ZD1 is connected to the cathode of the second Zener diode ZD2 and to the source of the first MOSFET Q1. The second Zener diode... The anode of transistor ZD2 is connected to the first end of the third resistor R3. The second end of the third resistor R3, the first end of the fourth resistor R4, and the base of the first transistor 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 is connected to the emitter of the second transistor Q3. The collector of the second transistor Q3 is used to connect to the system power supply. The base of the second transistor Q3 is connected to the pulse width control circuit 20. The second end of the third capacitor C3 and the emitter of the first transistor Q2 are grounded.

[0037] The intelligent auxiliary power supply circuit for lasers also includes an isolation circuit, which includes a third diode D3. The anode of the third diode D3 is connected to the output terminal of the startup circuit 30, and the cathode of the third diode D3 is used to connect to the 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 to the first capacitor C1 divide the external power supply and then supply power to the internal primary diode of the first optocoupler OC1 through the third Zener diode ZD3. The internal transistor is turned on, which means that the input is powered on. The third transistor Q4 is turned on, and the pulse width control circuit 20 can start and work normally. Because the capacitance of the first capacitor C1 is relatively 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. The specific time can be set according to actual conditions and user requirements. After the external power supply is lost, the voltage on the first capacitor C1, after being discharged through the sixth resistor R6 and the seventh resistor R7 for 2.5 seconds, drops below the conduction voltage of the third Zener diode ZD3. The internal primary diode of the first optocoupler OC1 is cut off, and the internal transistor is disconnected, indicating a power outage. The third transistor Q4 is cut off, the pulse width control circuit 20 is de-energized, and the output stops. The voltages VO+ and Vmcu+ are zero, the system power supply has no current, and the first resistor R1 and the first MOSFET Q1 are in an unloaded standby state with no current and no losses. The eighth resistor R8 limits current to prevent device damage. Figure 3 Vmcu+ and Vmcu- are the connection terminals of processor circuit 60.

[0039] It should be noted that if the processor directly collects the input AC voltage, the processor's decision logic will conflict with the power supply logic. This is because when the input power fails, the processor shuts down the pulse width control circuit 20, at which point the voltages at the VO+ and Vmcu+ ports are zero. If the processor's power supply is Vmcu+, the processor will fail and release control once the voltage at Vmcu+ is 0V. The second capacitor C2 has a large capacitance and stores a significant amount of charge. Without a discharge circuit, the auxiliary power supply circuit will restart to supply power to the processor, and then the processor will detect the lack of input voltage and shut down, repeating this cycle until the charge on the second capacitor C2 is discharged to the point where the auxiliary power supply circuit can no longer start. However, this design incorporates a discharge circuit for the second capacitor C2, preventing the processor circuit 60 from restarting when the external power supply fails.

[0040] Furthermore, in this embodiment, the first resistor R1 is the startup resistor, the first MOSFET Q1 operates in linear regulation mode, the second resistor R2 is the gate power supply resistor for the first MOSFET Q1, and the fourth capacitor C4 is the energy storage and filtering startup capacitor. After the third transistor Q4 is turned on, the pulse width control circuit 20 is powered on and outputs a PWM drive signal, with normal output at the VO+ terminal. The pulse width control circuit 20 outputs an OFF high-level signal to the base of the second transistor Q3, turning on the second transistor Q3. The system power supply, delayed by the second transistor Q3, the fifth resistor R5, and the third capacitor C3, drives the first transistor Q2 to turn on via the fourth resistor R4, pulling down the gate voltage of the first MOSFET Q1 and turning off the first MOSFET Q1, thus reducing the losses of the first resistor R1 and the first MOSFET Q1. It can be understood that at the moment of power-on, the first resistor R1 and the first MOSFET Q1 supply power to the pulse width control circuit 20. After the circuit starts and the output is normal, the first MOSFET Q1 is turned off, and there are no losses in the first resistor R1 and the first MOSFET Q1. Furthermore, after the circuit starts up and the output is normal, the transformer winding is rectified by the second diode D2 and filtered by the fourth capacitor C4 before outputting the system power supply. During the startup process, the system power supply gradually rises from a low level to the normal supply voltage.

[0041] The third diode, D3, is an isolation diode. After the auxiliary power supply circuit is working, the third diode D3 prevents the system power supply voltage from flowing back to the source of the first MOSFET Q1, thus avoiding malfunction of the second Zener diode ZD2, the third resistor R3, and the first transistor Q2 circuit. The first Zener diode ZD1 is the gate protection Zener diode for the first MOSFET Q1. The second Zener diode ZD2, the third resistor R3, and the first transistor Q2 form the output overvoltage protection circuit for the first MOSFET Q1. When the source output voltage of the first MOSFET Q1 exceeds the second Zener diode ZD2 and reaches the turn-on voltage of the first transistor Q2, the first transistor Q2 turns on, pulling down the gate voltage of the first MOSFET Q1 and reducing the source output voltage of the first MOSFET Q1, thus protecting the fourth capacitor C4 from overvoltage failure.

[0042] In one embodiment, the intelligent auxiliary power supply circuit for the laser further includes: A power input terminal is used to connect to an external power source, and the power input terminal is connected to the power detection and control circuit 10. The power output terminal is used to connect to the laser load, and the power output terminal is connected to the output terminal of the power conversion output circuit 40.

[0043] In this embodiment, the power input terminal and power output terminal can be power interfaces, and the specific interface model can be selected according to the actual situation and user needs. Setting power input and power output terminals can provide electrical isolation and adaptation for the electronic components in the intelligent auxiliary power supply circuit for lasers.

[0044] Reference Figure 3 In one embodiment, the intelligent auxiliary power supply circuit for the laser further includes: A rectifier circuit is provided, wherein the input terminal of the rectifier circuit is connected to the power input terminal, and the output terminal of the rectifier circuit is connected to the power detection and control circuit 10. The rectifier circuit is used to rectify the external power supply and output it to the power detection and control circuit 10.

[0045] In this embodiment, the external power supply, after being rectified by six diodes in a full-wave manner, is connected to the first capacitor C1. After isolation by the first diode D1, the power is filtered and stored by the second capacitor C2 to supply power to the auxiliary power supply circuit. The number of diodes in the rectifier circuit can also be set according to actual conditions and user requirements.

[0046] Reference Figure 3 In one embodiment, the intelligent auxiliary power supply circuit for the laser further includes: An overcurrent detection circuit 70 is provided, wherein the detection terminal of the overcurrent detection circuit 70 is connected to the power output terminal, and the output terminal of the overcurrent detection circuit 70 is connected to the pulse width control circuit 20. The overcurrent detection circuit 70 is used to detect the output current of the power output terminal and output a current detection signal to the pulse width control circuit 20.

[0047] In this embodiment, the overcurrent detection circuit 70 can sample and detect the current connected to the laser load at the power output terminal through the ninth resistor R9, and output a current detection signal to the pulse width control circuit 20. The pulse width control circuit 20 can determine the magnitude of the current output to the laser load based on 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 invention also proposes a laser device.

[0049] In one embodiment, the laser device includes a laser load and a smart auxiliary power supply circuit for the laser as described above, wherein the laser load is connected to the power conversion output circuit 40 in the smart auxiliary power supply circuit for the laser. It is understood that since the aforementioned smart auxiliary power supply circuit for the laser is used in the laser device of the present invention, the embodiments of the laser device of the present invention include all the technical solutions of all embodiments of the aforementioned smart auxiliary power supply circuit for the laser, and the achieved technical effects are completely the same, and will not be repeated here.

[0050] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A smart auxiliary power supply circuit for a laser, characterized in that, include: Power detection and control circuit, pulse width control circuit, startup circuit, power conversion output circuit and output overvoltage protection circuit; The detection terminal of the power detection and control circuit is used to connect to an external power source; The input terminal of the startup circuit is used to connect to an external power source; The output control terminal of the power detection and control circuit is located between the output terminal of the startup circuit and the power terminal of the pulse width control circuit. The power detection and control circuit is used to conduct the electrical connection between the startup circuit and the pulse width control circuit when an external power supply is detected to be powered on. The power detection and control circuit is also used to disconnect the electrical connection between the startup circuit and the pulse width control circuit when an external power failure is detected. The controlled terminal of the power conversion output circuit is connected to the output terminal of the pulse width control circuit. The input terminal of the power conversion output circuit is used to connect to an external power supply, and the output terminal of the power conversion output circuit is used to connect to a laser load. The output terminal of the pulse width control circuit is connected to the controlled terminal of the power conversion output circuit. The pulse width control circuit is used to control the power conversion output circuit to convert the voltage of the external power supply and output it to the laser load when an external power supply is connected. The power detection and control circuit includes a first capacitor, a first diode, a sixth resistor, a seventh resistor, an eighth resistor, a third Zener diode, a first optocoupler, and a third transistor. The first terminal of the first capacitor, the anode of the first diode, and the first terminal of the sixth resistor are interconnected and used to connect to the positive terminal of an external power supply. The cathode of the first diode is connected to the input terminal of the startup circuit. The second terminal of the first capacitor, the second terminal of the seventh resistor, and the second terminal of the first optocoupler are interconnected and used to connect to the negative terminal of the external power supply. The second terminal of the sixth resistor, the first terminal of the seventh resistor, and the cathode of the third Zener diode are interconnected. The anode of the third Zener diode is connected to the first terminal of the first optocoupler. The third terminal of the first optocoupler is connected to the base of the third transistor. The fourth terminal of the first optocoupler is connected to the first terminal of the eighth resistor. The second terminal of the eighth resistor is connected to the collector of the third transistor. The emitter of the third transistor is connected to the power supply terminal of the pulse width control circuit. The startup circuit includes a first resistor, a second resistor, and a first MOSFET. The first end of the first resistor and the first end of the second resistor are connected and used to connect to an external power supply. The second end of the first resistor is connected to the drain of the first MOSFET. The second end of the second resistor is connected to the gate of the first MOSFET. The source of the first MOSFET is connected to the output control terminal of the power supply detection and control circuit. The output overvoltage protection circuit includes 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 is connected to the collector of the first transistor and to the gate of the first MOSFET. The anode of the first Zener diode is connected to the cathode of the second Zener diode and to the source of the first MOSFET. The anode of the second Zener diode is connected to the first terminal of the third resistor. The second terminal of the third resistor, the first terminal of the fourth resistor, and the base of the first transistor are connected. The second terminal of the fourth resistor, the first terminal of the third capacitor, and the first terminal of the fifth resistor are interconnected. The second terminal of the fifth resistor is connected to the emitter of the second transistor. The collector of the second transistor is connected to the system power supply. The base of the second transistor is connected to the pulse width control circuit. The second terminal of the third capacitor and the emitter of the first transistor are grounded.

2. The intelligent auxiliary power supply circuit for lasers as described in claim 1, characterized in that, Also includes: An AC voltage sampling circuit is provided, wherein the sampling terminal of the AC voltage sampling circuit is used to connect to an external power supply, and the AC voltage sampling circuit is used to acquire the voltage value of the external power supply and output a voltage detection signal. The processor circuit is connected to the AC voltage sampling circuit and also to the pulse width control circuit. The processor circuit is used to perform overvoltage protection when the external power supply voltage is higher than the overvoltage threshold based on the voltage detection signal. The processor circuit is used to determine, based on the voltage detection signal, that when the external power supply voltage is lower than the undervoltage threshold, it performs undervoltage protection. The processor circuit is also used to turn off the pulse width control circuit when a standby signal is received.

3. The intelligent auxiliary power supply circuit for lasers as described in claim 1, characterized in that, Also includes: An isolation circuit is provided, comprising a third diode, the anode of which is connected to the output terminal of the startup circuit, and the cathode of which is connected to the system power supply.

4. The intelligent auxiliary power supply circuit for lasers as described in claim 1, characterized in that, Also includes: A power input terminal is used to connect to an external power source, and the power input terminal is connected to the power detection and control circuit. The power output terminal is used to connect to the laser load, and the power output terminal is connected to the output terminal of the power conversion output circuit.

5. The intelligent auxiliary power supply circuit for lasers as described in claim 4, characterized in that, Also includes: A rectifier circuit, wherein the input terminal of the rectifier circuit is connected to the power input terminal, and the output terminal of the rectifier circuit is connected to the power detection and control circuit, and the rectifier circuit is used to rectify the external power supply and output it to the power detection and control circuit.

6. The intelligent auxiliary power supply circuit for lasers as described in claim 4, characterized in that, Also includes: An overcurrent detection circuit is provided, wherein the detection terminal of the overcurrent detection circuit is connected to the power supply output terminal, and the output terminal of the overcurrent detection circuit is connected to the pulse width control circuit. The overcurrent detection circuit is used to detect the output current of the power supply output terminal and output a current detection signal to the pulse width control circuit.

7. A laser device, characterized in that, It includes a laser load and a smart auxiliary power supply circuit for a laser as described in any one of claims 1-6, wherein the laser load is connected to the power conversion output circuit in the smart auxiliary power supply circuit for a laser.

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