A laser anti-leakage control circuit, control method and laser

Abstract

This invention provides a laser leakage prevention control circuit, control method, and laser. In the laser leakage prevention control circuit, a pre-stage control module is used to receive a pre-stage conduction signal, and the output terminal of the pre-stage control module is connected to a pump source. The pump source is in standby mode when a pre-conduction current is received and emits pump light when a working current is received. A linkage control module receives the pre-stage conduction signal and is used to delay the output of an on-state indication signal to the subsequent control module. When at least one of the working control signal or the pre-stage conduction signal is off, the circuit input and circuit output terminals of the subsequent control module are in a high-impedance state. When both signals are on, the circuit input and circuit output terminals of the subsequent control module are connected. This invention delays the control of the subsequent control module's operating state through the linkage control module, thereby increasing the light output response speed and preventing instantaneous laser output caused by a large current conduction at power-on, thus improving the laser's safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of laser drive control circuit technology, and in particular to a laser anti-leakage control circuit, control method and laser. Background Technology

[0002] With the development of fiber optic communication technology, the application of lasers is becoming increasingly widespread, and the requirements for stability are gradually increasing. With the advancement of technologies such as ultrafast optics and dynamic displays, lasers have certain requirements for their output response speed. The output response time of a laser directly determines the effectiveness and stability of the laser system; the shorter the laser output response time, the better the effectiveness and the higher the success rate of the laser system.

[0003] In existing technologies, to meet the requirements for laser emission response speed, a common approach is to apply a small signal to the subsequent control switch during the period when the pump source is not emitting light, causing the pump source to start prematurely with a small current, thereby improving the emission response speed. However, in actual use, when the power supply voltage is turned on again after the pump source has started operating prematurely, a large instantaneous current will occur when the power supply is powered on, causing the laser to emit light instantaneously. This poses a hazard to the personal safety of test personnel and the safety of the test equipment.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a laser anti-leakage control circuit, control method and laser, so as to solve the problem that the existing control circuits used to speed up the laser light output response time are prone to light leakage, which leads to laser damage and safety accidents.

[0006] The technical solution of the present invention is as follows:

[0007] This invention provides a laser leakage prevention control circuit, comprising: a pre-stage control module, a pump source, a linkage control module, and a post-stage control module; wherein,

[0008] The input terminal of the pre-stage control module is connected to the power supply voltage, the control terminal of the pre-stage control module is used to receive the pre-stage conduction signal, and the output terminal of the pre-stage control module is connected to the pump source.

[0009] The pump source is connected to the circuit input terminal of the subsequent control module, and is used to be in standby mode when the pre-conducting current is applied, and to emit pump light when the operating current is applied.

[0010] The control terminal of the linkage control module is connected to the front-end conduction signal, and the output terminal of the linkage control module is connected to the rear-end control module to delay the first delay time and output an activation indication signal to the rear-end control module.

[0011] The first control terminal of the downstream control module is connected to the working control signal, and the second control terminal of the downstream control module is connected to the linkage control module for receiving the start indication signal. The circuit output terminal of the downstream control module is grounded. When at least one of the working control signal or the preceding stage conduction signal is closed, the circuit input terminal and circuit output terminal of the downstream control module are in a high-impedance state. When both the working control signal and the preceding stage conduction signal are open, the circuit input terminal and circuit output terminal of the downstream control module are connected, and the pump source receives a pre-conduction current or a working current according to the working control signal.

[0012] In a further embodiment of the present invention, the pre-stage control module includes: a first switching transistor and a first resistor; wherein, the control terminal of the first switching transistor is connected to a pre-stage conduction signal, the first connection terminal of the first switching transistor is connected to a power supply voltage, the second connection terminal of the first switching transistor is connected to the pump source, one end of the first resistor is connected to the common connection terminal of the second connection terminal of the first switching transistor and the pump source, and the other end of the first resistor is connected to the control terminal of the first switching transistor.

[0013] In a further embodiment of the present invention, the linkage control module includes: a second resistor, a third resistor, a fourth resistor, a first capacitor, a first diode, and a third switching transistor; wherein,

[0014] One end of the second resistor is connected to the pre-amplifier signal, and the other end of the second resistor is connected to one end of the third resistor. The other end of the third resistor is grounded. The control terminal of the third switch is connected to the common terminal of the second and third resistors. The first connection terminal of the third switch is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to a DC regulated voltage. The second connection terminal of the third switch is grounded. One end of the first capacitor is connected to the control terminal of the third switch, and the other end of the first capacitor is grounded. The anode of the first diode is connected to the common terminal of the first connection terminal of the fourth resistor and the third switch, and the cathode of the first diode is connected to the subsequent control module.

[0015] In a further embodiment of the present invention, the subsequent control module includes: a first operational amplifier, a second switching transistor, and a fifth resistor; wherein,

[0016] The non-inverting input terminal of the first operational amplifier is connected to the working control signal, the inverting input terminal of the first operational amplifier is connected to the output terminal of the linkage control module, the signal output terminal of the first operational amplifier is connected to the control terminal of the second switching transistor, the first connection terminal of the second switching transistor is connected to the pump source, the second connection terminal of the second switching transistor is connected to one end of the fifth resistor and the inverting input terminal of the operational amplifier, and the other end of the fifth resistor is grounded.

[0017] In a further embodiment of the present invention, the first switching transistor and the second switching transistor are NMOS transistors.

[0018] In a further embodiment of the present invention, the pre-conduction current is less than the light-emitting threshold current of the pump source.

[0019] A further embodiment of the present invention includes a constant current source module and a microcontroller module, wherein the voltage output terminal of the constant current source module is connected to the front-end control module for outputting power supply voltage to the front-end control module;

[0020] The voltage detection terminal of the microcontroller module is connected to the constant current source module, the pre-control terminal of the microcontroller module is connected to the control terminal of the front-end control module, and the working control terminal of the microcontroller module is connected to the first control terminal of the rear-end control module. This is used to detect the working state of the constant current source module and, when the constant current source module is working stably, output an on signal to the front-end control module to put the pump source into standby mode; and output a working control signal to the rear-end control module to connect the pump source in standby mode to the working current and emit pump light.

[0021] Based on the same inventive concept, the present invention provides a laser light leakage prevention control method for controlling the aforementioned laser light leakage prevention control circuit, the steps of which include:

[0022] During a power-on cycle to prevent light leakage, power is turned on and power supply stability is tested.

[0023] When the power supply is stable and normal, the front-end conduction signal is output to the control terminal of the front-end control module to put the pump source into standby mode.

[0024] The operating control signal is output to the subsequent control module according to the light output mode, and the subsequent control module is turned on according to the activation of the operating control signal.

[0025] The pump source is controlled by the subsequent control module to switch from standby mode to the corresponding light emission mode and emit pump light.

[0026] A further provision of the present invention, after the steps of outputting a working control signal to the subsequent control module according to the light output mode, and controlling the subsequent control module to be turned on according to the activation of the working control signal, includes:

[0027] The status of the pre-stage conduction signal is detected. When the pre-stage conduction signal is turned off, the working control signal is turned off and the current anti-leakage power-on cycle ends, and the next anti-leakage power-on cycle begins.

[0028] Based on the same inventive concept, the present invention provides a laser, which includes the laser leakage prevention control circuit described above.

[0029] This invention provides a laser leakage prevention control circuit, control method, and laser. The laser leakage prevention control circuit includes: a pre-stage control module, a pump source, a linkage control module, and a post-stage control module. The input terminal of the pre-stage control module is connected to a power supply voltage, and its control terminal is used to receive a pre-stage conduction signal. The output terminal of the pre-stage control module is connected to the pump source. The pump source is connected to the circuit input terminal of the post-stage control module and is used to be in standby mode when a pre-conduction current is applied, and to emit pump light when a working current is applied. The control terminal of the linkage control module receives the pre-stage conduction signal, and its output terminal is connected to the post-stage control module for... The first delay time is postponed, and an on-indication signal is output to the subsequent control module. The first control terminal of the subsequent control module is connected to the working control signal, and the second control terminal of the subsequent control module is connected to the linkage control module for receiving the on-indication signal. The circuit output terminal of the subsequent control module is grounded. When at least one of the working control signal or the preceding stage conduction signal is off, the circuit input terminal and circuit output terminal of the subsequent control module are in a high-impedance state. When both the working control signal and the preceding stage conduction signal are on, the circuit input terminal and circuit output terminal of the subsequent control module are connected, and the pump source is connected to the pre-conduction current or the working current according to the working control signal. This invention, while meeting the performance requirements of existing laser control circuits, controls the working state of the subsequent control module by delaying the operation of the linkage control module by a predetermined time. This increases the light output response speed and prevents instantaneous laser output caused by a large current conduction at power-on, thereby improving the laser's safety and reliability. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the laser light leakage prevention control circuit in this invention.

[0032] Figure 2 This is a circuit diagram of the laser light leakage prevention control circuit in this invention.

[0033] Figure 3 This is a schematic diagram of the steps of the laser light leakage prevention control method in this invention.

[0034] The labels in the attached diagram are as follows: 100, front-end control module; 200, pump source; 300, linkage control module; 400, back-end control module. Detailed Implementation

[0035] This invention provides a laser leakage prevention control circuit, control method, and laser. 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.

[0036] 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.

[0037] 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 we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. 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.

[0038] 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.

[0039] 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.

[0040] The control system of the pump source is its core, and its control stability ultimately determines the characteristics of the output laser. Because the pump source is a high-power-density device with extremely high quantum efficiency, it has poor tolerance to electrical shocks. Even small changes in its drive current will lead to variations in output performance parameters, such as lasing wavelength, noise performance, mode skipping, and output optical power. These variations directly affect the quality of the pump source's output laser. Therefore, practical applications place extremely high demands on the laser's drive and control circuitry.

[0041] The inventors discovered that as the variety of handheld lasers on the market increases, so do the quality requirements, and safety accidents are unacceptable. In handheld lasers, leakage can occur in certain scenarios due to varying operating conditions and environments, leading to safety hazards. Specifically, as the performance requirements for handheld lasers become increasingly stringent, there are specific requirements for controlling the laser's output speed. To meet these speed requirements, a series of circuits have been added; however, increasing the response speed also increases the risk of light leakage. Current methods to increase the output speed involve first powering on the drive power supply. During the period when the constant current drive is not producing light, a small voltage is applied to the constant current drive control signal on the switching control terminal of the pump source's downstream circuit, causing the control circuit to start prematurely. A small current flows through the pump source, but this current is insufficient to reach the laser's output power, keeping the pump source in standby mode, thus increasing the output speed. However, at this point, the control circuit is already functioning normally. Under certain control logic, noise, or specific conditions during constant current drive, the laser may emit light for a short period. For example, when the pump source is in standby mode, a large instantaneous current will appear when the power supply is turned off and restarted. Since the downstream switch is already on at this time, the large instantaneous current will appear on the pump source, causing the laser to emit light instantly with a large transient power. This may damage the equipment, generate processing waste, and may even pose a threat to the safety of the operators.

[0042] To address the problems existing in the current technology, such as Figure 1As shown, this invention provides a laser leakage prevention control circuit, comprising: a pre-stage control module 100, a pump source 200, a linkage control module 300, and a post-stage control module 400; wherein, the input terminal of the pre-stage control module 100 is connected to the power supply voltage Vin+, the control terminal of the pre-stage control module 100 is used to receive the pre-stage conduction signal ON / OFF, and the output terminal of the pre-stage control module 100 is connected to the pump source 200; the pump source 200 is connected to the circuit input terminal of the post-stage control module 400, and is used to be in standby mode when a pre-conduction current is received, and to emit pump light when a working current is received; the control terminal of the linkage control module 300 is connected to the pre-stage conduction signal ON / OFF, and the output terminal of the linkage control module 300 is connected to the post-stage control module 400, used to delay the first A delay time is set and an on-indication signal is output to the subsequent control module 400; the first control terminal of the subsequent control module 400 is connected to the working control signal D / A, and the second control terminal of the subsequent control module 400 is connected to the linkage control module 300 for receiving the on-indication signal; the circuit output terminal of the subsequent control module 400 is grounded; when at least one of the working control signal D / A or the preceding stage conduction signal ON / OFF is closed, the circuit input terminal and circuit output terminal of the subsequent control module 400 are in a high-impedance state; when both the working control signal D / A and the preceding stage conduction signal ON / OFF are open, the circuit input terminal and circuit output terminal of the subsequent control module 400 are connected, and the pump source 200 receives a pre-conduction current or a working current according to the working control signal D / A.

[0043] Specifically, when the laser is powered on, the pre-stage control module 100 is first turned on by the pre-stage ON / OFF signal. The power supply voltage Vin+ is connected to the pump source 200 through the input and output terminals of the pre-stage control module 100. Simultaneously, upon receiving the pre-stage ON / OFF signal, the linkage control module 300 outputs an on-state indication signal to the downstream control module 400 after a first delay. During the first delay, the second control terminal of the downstream control module 400 remains off. With the downstream control module 400 off, its circuit input and output terminals maintain a high impedance state. At this time, regardless of whether the operating control signal D / A in the downstream control module 400 is turned on or off, because the on-state indication signal is delayed, even if the laser power-on causes a momentary large current in the power supply voltage Vin+, the branch containing the pump source 200 remains off during the delayed on-state time, preventing light leakage from the pump source 200 due to a momentary large current flow, thus achieving power-on protection. When the downstream control module 400 receives the start-up indication signal and starts, it can control the working state of the pump source 200 according to the working control signal D / A. Specifically, the working control signal D / A can include at least two working modes: a standby signal and a normal conduction signal. Since the power supply voltage Vin+ is fully conducting at this time, the working control signal D / A can first output a standby signal, which is a small signal, so that a small current flows in the branch of the pump source 200. Under this small current, the pump source 200 has not reached the output power, and the laser is in standby mode. When the laser needs to start emitting light, the working control signal D / A switches from the small signal to the normal conduction signal. When the working control signal D / A is the normal conduction signal, the current in the branch of the pump source 200 is greater than the output threshold current of the pump source 200, so as to control the pump source 200 to emit light. Correspondingly, even if the D / A control signal in the subsequent control module 400 is in the on state upon power-up, due to the first delay time between the on / off state of the preceding stage conduction signal and the output on / off indication signal to the subsequent control module 400, the subsequent control module 400 will remain off during the first delay time, and no large current will flow. The formal conduction signal is used to drive the working state of the pump source, and its specific waveform can be determined according to the specific laser operating mode selected, which will not be elaborated here.

[0044] Please refer to the following: Figure 1 and Figure 2Furthermore, the front-end control module 100 includes: a first switch Q1 and a first resistor R1; wherein, the control terminal of the first switch Q1 is connected to the front-end conduction signal ON / OFF, the first connection terminal of the first switch Q1 is connected to the power supply voltage Vin+, the second connection terminal of the first switch Q1 is connected to the pump source 200, one end of the first resistor R1 is connected to the common connection terminal of the second connection terminal of the first switch Q1 and the pump source 200, and the other end of the first resistor R1 is connected to the control terminal of the first switch Q1.

[0045] The first switch Q1 is used to control the power supply voltage Vin+ to be powered on according to the pre-stage conduction signal ON / OFF. When the pre-stage conduction signal ON / OFF is on, the first switch Q1 is turned on according to the pre-stage conduction signal ON / OFF, and the first connection terminal and the second connection terminal of the first switch Q1 are connected, so that the power supply voltage Vin+ is connected to the pump source 200 through the first switch Q1 to realize power-on. When the pre-stage conduction signal ON / OFF is off, the first connection terminal and the second connection terminal of the first switch Q1 are turned off accordingly according to the pre-stage conduction signal ON / OFF being off, thereby disconnecting the external power supply voltage Vin+. The first resistor R1 is used to provide a bias voltage for the first switch Q1 and to discharge static electricity. It should be noted that the on and off of the pre-stage conduction signal ON / OFF, the working control signal D / A, and the on indication signal are only used to indicate the working state of the first switch Q1 under that level state. Taking the pre-stage conduction signal ON / OFF as an example, the pre-stage conduction signal ON / OFF can be at a high level or a low level when it is on. Accordingly, the ON / OFF signal of the preceding stage can be either low or high when turned off, depending on whether the first switch Q1 is an NMOS (N-Metal-Oxide-Semiconductor Field-Effect Transistor) or a PMOS (P-Metal-Oxide-Semiconductor Field-Effect Transistor). Preferably, in this invention, the first switch Q1 is an NMOS transistor. The gate of the NMOS transistor is connected to the ON / OFF signal of the preceding stage, the drain of the NMOS transistor is connected to the power supply voltage Vin+, and the source of the NMOS transistor is connected to the pump source 200. When the ON / OFF signal of the preceding stage is high, the NMOS transistor is turned on. It should be noted that the first switch Q1 can also be an IGBT (Insulated Gate Bipolar Transistor), a transistor, or a relay, which will not be elaborated here.

[0046] Further, the linkage control module 300 includes: a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a first diode D1, and a third switch Q3; wherein, one end of the second resistor R2 is connected to the front-end conduction signal ON / OFF, the other end of the second resistor R2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is grounded, the control terminal of the third switch Q3 is connected to the common terminal of the second resistor R2 and the third resistor R3, the first connection terminal of the third switch Q3 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to a DC regulated voltage; the second connection terminal of the third switch Q3 is grounded; one end of the first capacitor C1 is connected to the control terminal of the third switch Q3, the other end of the first capacitor C1 is grounded; the anode of the first diode D1 is connected to the common terminal of the first connection terminal of the fourth resistor R4 and the third switch Q3, and the cathode of the first diode D1 is connected to the rear-end control module 400.

[0047] Preferably, the third switch Q3 can be a MOSFET (Metal-Oxide-Semiconductor-Field-Effect Transistor), preferably an NMOS transistor, but it can also be other switching devices such as IGBTs (Insulated Gate Bipolar Transistors), transistors, or relays. Specifically, the second resistor R2 and the third resistor R3 are used to divide the ON / OFF signal of the preceding stage, and the control terminal of the third switch Q3 is used to detect the voltage value after the voltage is divided by the second resistor R2 and the third resistor R3. The first capacitor C1 is used for delay. When the ON / OFF signal of the preceding stage is turned on and at a high level, the first capacitor C1 begins to charge. Since the first capacitor C1 requires charging time, this increases the turn-on time of the third switch Q3. The switching time of the third switch Q3 determines the length of the first delay time. That is, the first delay time depends on the time from when the pre-stage ON / OFF signal is turned on to when the third switch Q3 is fully turned on. For example, this first delay time can be less than 30µs. To maintain sufficient margin, the first delay time can also be in the range of 50-100µs. After charging is complete, the third switch Q3 is turned on, and the anode side of the first diode D1 is pulled low to ground. At this time, the first diode D1 is turned off, and the turn-on indicator signal output to the subsequent control module 400 is low. Correspondingly, when the pre-stage ON / OFF signal is turned off, the first and second connection terminals of the third switch Q3 are disconnected, and the second control terminal of the subsequent control module 400 is pulled high by a DC regulated voltage through the first diode D1 and the fourth resistor R4, and the turn-on indicator signal is high.

[0048] Further, the subsequent control module 400 includes: a first operational amplifier U1B, a second switch Q2, and a fifth resistor R5; wherein, the non-inverting input terminal of the first operational amplifier U1B is connected to the working control signal D / A, the inverting input terminal of the first operational amplifier U1B is connected to the output terminal of the linkage control module 300, the signal output terminal of the first operational amplifier U1B is connected to the control terminal of the second switch Q2, the first connection terminal of the second switch Q2 is connected to the pump source 200, the second connection terminal of the second switch Q2 is connected to one end of the fifth resistor R5 and the inverting input terminal of the first operational amplifier U1B respectively, and the other end of the fifth resistor R5 is grounded.

[0049] Specifically, the first operational amplifier U1B is used to compare the on-indication signal and the operating control signal D / A. Since the on-indication signal is obtained by the linkage control module 300 based on the pre-stage conduction signal ON / OFF, the operating states of the pre-stage conduction signal ON / OFF and the operating control signal D / A can be indirectly compared by comparing the on-indication signal and the operating control signal D / A. Specifically, when the pre-stage conduction signal ON / OFF is on, the first diode D1 in the linkage control module 300 is turned off, and the charge on the inverting input terminal of the first operational amplifier U1B is discharged through the fifth resistor R5. Therefore, the level at the signal output terminal of the first operational amplifier U1B is determined by the high or low level of the operating control signal D / A on the non-inverting input terminal. Preferably, the second switch Q2 is an NMOS transistor. When the pre-stage conduction signal ON / OFF is on and the operating control signal D / A is off, the first connection terminal and the second connection terminal of the first switch Q1 are connected. The pre-conduction current is the turn-off current of the second switch Q2, used for the pre-start of the pump source 200. The pump source 200 can be normally connected to either a pre-conduction current or a working current. Therefore, the operating state of the pump source 200 can be adjusted by adjusting the working control signal D / A. Specifically, the amplitude, frequency, and duty cycle of the working control signal D / A are determined according to a predetermined relationship between the mode and functional requirements and the current. For example, the amplitude of the working control signal D / A is in the range of 0-5V, the frequency is 0-10kHz, and the duty cycle is 0-90%. When the working control signal D / A outputs a standby signal, that is, when the pump source 200 is operating in a low-current state, the pre-conduction current is less than the light-emitting threshold current of the pump source 200, which is determined according to the light-emitting threshold current of the pump source. For example, the light-emitting threshold current of the pump source 200 can be selected in the range of 1-2A, then the maximum current corresponding to the small signal of the working control signal D / A is 500mA.

[0050] A further embodiment of the present invention includes a constant current source module (not shown in the figure) and a microcontroller module (not shown in the figure). The voltage output terminal of the constant current source module is connected to the pre-stage control module 100 and is used to output a power supply voltage Vin+ to the pre-stage control module 100. The voltage detection terminal of the microcontroller module is connected to the constant current source module. The pre-control terminal of the microcontroller module is connected to the control terminal of the pre-stage control module 100. The working control terminal of the microcontroller module is connected to the first control terminal of the post-stage control module 400. The microcontroller module is used to detect the working state of the constant current source module and output an ON / OFF signal to the pre-stage control module 100 when the constant current source module is working stably, so that the pump source 200 is in a standby state. The microcontroller module also outputs a D / A working control signal to the post-stage control module 400, so that the pump source 200 in the standby state is connected to the working current and emits pump light.

[0051] For example, the constant current source module and the microcontroller module can be located on the same control board as the pre-stage control module 100, pump source 200, linkage control module 300, and post-stage control module 400, or they can be located on different control boards. The microcontroller module can be independently mounted on the control board and connected to the pre-stage control module 100 and the post-stage control module 400 respectively via data cables. It can be directly controlled by the user through external circuits, or communicate and be remotely controlled with a host computer through wired and wireless communication networks. Specifically, the microcontroller module is used to receive user control commands transmitted from an external network or user control commands generated locally. The user control commands may include the laser's operating mode, operating status, or other operating parameters. According to the corresponding user control commands, the microcontroller module outputs a pre-stage conduction signal ON / OFF to the pre-stage control module 100 and an operating control signal D / A to the post-stage control module 400. The pre-stage ON / OFF signal and the D / A control signal can be output simultaneously, or the pre-stage ON / OFF signal can be output with a predetermined delay before the D / A control signal is output. When the pre-stage ON / OFF signal and the D / A control signal are output simultaneously, the linkage control module 300 has an internal delay function, thus enabling it to simultaneously control the operating state of the post-stage control module 400. This prevents laser light leakage caused by the post-stage control module 400 turning on when the power supply voltage Vin+ is applied.

[0052] Specifically, in this invention, during circuit operation, the first switch Q1 is a protection MOSFET, and the second switch Q2 is a control MOSFET. To increase the light output speed, a small working control signal (D / A) voltage is applied. Due to circuit characteristics, even when no light output signal is required, the pump source has current, but the light output requirement is not met. Each time the first switch Q1 is turned off by the pre-stage ON / OFF signal, the second switch Q2 is simultaneously turned off. The second switch Q2 will only turn on again after the pre-stage ON / OFF signal is turned on. Thus, whether the second switch Q2 is turned on due to interference in the power supply due to the working control signal (D / A) at the control terminal, or the working control signal (D / A) is intentionally added to improve the light output response time, the laser leakage event will not occur due to a large instantaneous current from the constant current drive when the pre-stage ON / OFF signal is turned on.

[0053] Based on the same inventive concept, please refer to [the relevant documentation / reference]. Figure 1 , Figure 2 and Figure 3 This invention provides a laser light leakage prevention control method for controlling the aforementioned laser light leakage prevention control circuit, the steps of which include:

[0054] S100: During a power-on cycle to prevent light leakage, power supply is turned on and power supply stability is detected;

[0055] S200. When the power supply is stable and normal, output the front-end conduction signal to the control terminal of the front-end control module to put the pump source into standby state.

[0056] S300: Output a working control signal to the downstream control module according to the light output mode, and control the downstream control module to turn on according to the activation of the working control signal;

[0057] S400: The pump source is controlled by the subsequent control module to switch from standby mode to the corresponding light emission mode and emit pump light.

[0058] For example, the pre-stage conduction signal originates from the microcontroller module on the control board. When the user turns on the laser, the constant current source first turns on to provide power and voltage. The control board detects the stability of the power supply. When the detection result indicates that the power supply is normal, it issues the pre-stage conduction signal. Simultaneously, the working control signal outputs a standby signal to allow a small current to flow through the pump source. The working control signal can be provided by the control board or by other external circuits on the constant current board. At this time, the laser is in standby mode. When light emission is required, the control board issues a corresponding working control signal according to different application modes, controlling the current magnitude, current frequency, and duty cycle. Specific details are as described in the specific embodiment of the laser anti-leakage control circuit, and will not be repeated here.

[0059] A further provision of the present invention, after the steps of outputting a working control signal to the subsequent control module according to the light output mode, and controlling the subsequent control module to be turned on according to the activation of the working control signal, includes:

[0060] N100: Detect the status of the pre-amplifier conduction signal. When the pre-amplifier conduction signal is turned off, the working control signal is turned off and the current anti-leakage power-on cycle ends, and the next anti-leakage power-on cycle begins.

[0061] Specifically, when the user pauses the laser's operation, the control signal of the preceding stage is turned off. At this time, to further prevent interference in the operating control signal from causing the subsequent control module to turn on, the operating control signal can be simultaneously turned off, ending the anti-leakage power-on cycle and returning to step S100. When the user restarts the laser, the next anti-leakage power-on cycle begins, controlling the operating state of the pump source.

[0062] Based on the same inventive concept, the present invention provides a laser, which includes the laser light leakage prevention control circuit described above. Specific embodiments of the laser light leakage prevention control circuit are as described herein, and will not be repeated here.

[0063] This invention provides a laser leakage prevention control circuit, control method, and laser. The laser leakage prevention control circuit includes: a pre-stage control module, a pump source, a linkage control module, and a post-stage control module. The input terminal of the pre-stage control module is connected to a power supply voltage, and its control terminal is used to receive a pre-stage conduction signal. The output terminal of the pre-stage control module is connected to the pump source. The pump source is connected to the circuit input terminal of the post-stage control module and is used to be in standby mode when a pre-conduction current is applied, and to emit pump light when a working current is applied. The control terminal of the linkage control module receives the pre-stage conduction signal, and its output terminal is connected to the post-stage control module for... The first delay time is postponed, and an on-indication signal is output to the subsequent control module. The first control terminal of the subsequent control module is connected to the working control signal, and the second control terminal of the subsequent control module is connected to the linkage control module for receiving the on-indication signal. The circuit output terminal of the subsequent control module is grounded. When at least one of the working control signal or the preceding stage conduction signal is off, the circuit input terminal and circuit output terminal of the subsequent control module are in a high-impedance state. When both the working control signal and the preceding stage conduction signal are on, the circuit input terminal and circuit output terminal of the subsequent control module are connected, and the pump source is connected to the pre-conduction current or the working current according to the working control signal. This invention, while meeting the performance requirements of existing laser control circuits, controls the working state of the subsequent control module by delaying the operation of the linkage control module by a predetermined time. This increases the light output response speed and prevents instantaneous laser output caused by a large current conduction at power-on, thereby improving the laser's safety and reliability.

[0064] 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 laser light leakage prevention control circuit, characterized in that, include: The system consists of a front-end control module, a pump source, a linkage control module, and a back-end control module; among which, The input terminal of the pre-stage control module is connected to the power supply voltage, the control terminal of the pre-stage control module is used to receive the pre-stage conduction signal, and the output terminal of the pre-stage control module is connected to the pump source. The pump source is connected to the circuit input terminal of the subsequent control module, and is used to be in standby mode when the pre-conducting current is applied, and to emit pump light when the operating current is applied. The control terminal of the linkage control module is connected to the front-end conduction signal, and the output terminal of the linkage control module is connected to the rear-end control module to delay the first delay time and output an activation indication signal to the rear-end control module. The first control terminal of the downstream control module is connected to the working control signal, and the second control terminal of the downstream control module is connected to the linkage control module for receiving the start indication signal. The circuit output terminal of the downstream control module is grounded. When at least one of the working control signal or the preceding stage conduction signal is closed, the circuit input terminal and circuit output terminal of the downstream control module are in a high-impedance state. When both the working control signal and the preceding stage conduction signal are open, the circuit input terminal and circuit output terminal of the downstream control module are connected, and the pump source receives a pre-conduction current or a working current according to the working control signal.

2. The laser leakage prevention control circuit according to claim 1, characterized in that, The pre-stage control module includes: a first switching transistor and a first resistor; wherein, the control terminal of the first switching transistor is connected to the pre-stage conduction signal, the first connection terminal of the first switching transistor is connected to the power supply voltage, the second connection terminal of the first switching transistor is connected to the pump source, one end of the first resistor is connected to the common connection terminal of the second connection terminal of the first switching transistor and the pump source, and the other end of the first resistor is connected to the control terminal of the first switching transistor.

3. The laser leakage prevention control circuit according to claim 1, characterized in that, The linkage control module includes: a second resistor, a third resistor, a fourth resistor, a first capacitor, a first diode, and a third switching transistor; wherein, One end of the second resistor is connected to the pre-amplifier signal, and the other end of the second resistor is connected to one end of the third resistor. The other end of the third resistor is grounded. The control terminal of the third switch is connected to the common terminal of the second and third resistors. The first connection terminal of the third switch is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to a DC regulated voltage. The second connection terminal of the third switch is grounded. One end of the first capacitor is connected to the control terminal of the third switch, and the other end of the first capacitor is grounded. The anode of the first diode is connected to the common terminal of the first connection terminal of the fourth resistor and the third switch, and the cathode of the first diode is connected to the subsequent control module.

4. The laser leakage prevention control circuit according to claim 2, characterized in that, The subsequent control module includes: a first operational amplifier, a second switching transistor, and a fifth resistor; wherein... The non-inverting input terminal of the first operational amplifier is connected to the working control signal, the inverting input terminal of the first operational amplifier is connected to the output terminal of the linkage control module, the signal output terminal of the first operational amplifier is connected to the control terminal of the second switching transistor, the first connection terminal of the second switching transistor is connected to the pump source, the second connection terminal of the second switching transistor is connected to one end of the fifth resistor and the inverting input terminal of the operational amplifier, and the other end of the fifth resistor is grounded.

5. The laser leakage prevention control circuit according to claim 4, characterized in that, The first and second switching transistors are NMOS transistors.

6. The laser leakage prevention control circuit according to claim 1, characterized in that, The pre-conduction current is less than the light-emitting threshold current of the pump source.

7. The laser leakage prevention control circuit according to claim 1, characterized in that, It also includes a constant current source module and a microcontroller module. The voltage output terminal of the constant current source module is connected to the front-end control module and is used to output power supply voltage to the front-end control module. The voltage detection terminal of the microcontroller module is connected to the constant current source module, the pre-control terminal of the microcontroller module is connected to the control terminal of the front-end control module, and the working control terminal of the microcontroller module is connected to the first control terminal of the rear-end control module. This is used to detect the working status of the constant current source module and output the front-end conduction signal to the front-end control module when the constant current source module is working stably, so that the pump source is in standby mode. It also outputs a working control signal to the subsequent control module, so that the pump source in standby mode is connected to the working current and emits pump light.

8. A method for preventing light leakage in a laser, characterized in that, The steps for controlling the laser leakage prevention control circuit as described in any one of claims 1-7 include: During a power-on cycle to prevent light leakage, power is turned on and power supply stability is tested. When the power supply is stable and normal, the front-end conduction signal is output to the control terminal of the front-end control module to put the pump source into standby mode. The operating control signal is output to the subsequent control module according to the light output mode, and the subsequent control module is turned on according to the activation of the operating control signal. The pump source is controlled by the subsequent control module to switch from standby mode to the corresponding light emission mode and emit pump light.

9. The laser leakage prevention control method according to claim 8, characterized in that, After the steps of outputting a working control signal to the subsequent control module according to the light output mode, and controlling the subsequent control module to turn on according to the activation of the working control signal, the method further includes: The status of the pre-stage conduction signal is detected. When the pre-stage conduction signal is turned off, the working control signal is turned off and the current anti-leakage power-on cycle ends, and the next anti-leakage power-on cycle begins.

10. A laser, characterized in that, The laser includes a laser light leakage prevention control circuit as described in any one of claims 1-7.

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