Laser driving circuit and method, and laser driver

Abstract

A laser driving circuit (100) and method, and a laser driver. The laser driving circuit (100) comprises a monitoring feedback module (110), a first control module (120), a voltage conversion module (130), and a laser device (140). The voltage conversion module (130) is configured to supply power to the laser device (140). The monitoring feedback module (110) is configured to measure first actual optical power of the laser device (140), generate a corresponding feedback signal, and send the feedback signal to the first control module (120). The first control module (120) is further configured to: determine the first actual optical power on the basis of the feedback signal; and generate a first power adjustment signal on the basis of target optical power and the first actual optical power, the first power adjustment signal being configured to control the laser device (140) to adjust to the target optical power. The optical power of the laser device (140) is controlled to be consistent.

Description

Laser driving circuit, method and laser driver

[0001] Cross Reference to Related Applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202410834869X, filed on June 26, 2024, and entitled “Laser driving circuit, method and laser driver”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of laser driving control, and in particular to a laser driving circuit, method and laser driver. BACKGROUND

[0004] The current laser or laser module on the market mostly adopts a constant current control mode. This control mode is simple, but cannot guarantee the consistency of the optical power of the laser. Another way is to match different resistors according to the internal resistance of each laser to adjust the optical power, so that the optical power of each laser is consistent. However, this way needs to paste different resistors according to different lasers or laser modules, which is difficult to produce.

[0005] SUMMARY

[0006] Therefore, the purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a laser driving circuit, method and laser driver. The present disclosure provides the following technical solutions:

[0007] The present disclosure provides a laser driving circuit, which comprises a monitoring feedback module, a first control module, a voltage conversion module and a laser device. The monitoring feedback module is electrically connected with the laser device and the first control module respectively. The first control module is electrically connected with the laser device and the voltage conversion module respectively. The voltage conversion module is electrically connected with the laser device.

[0008] The voltage conversion module is configured to supply power to the laser device.

[0009] The monitoring feedback module is configured to detect the first actual optical power of the laser device, generate a corresponding feedback signal, and send the feedback signal to the first control module.

[0010] The first control module is further configured to determine the first actual optical power according to the feedback signal, generate a first power adjustment signal according to a target optical power and the first actual optical power, and the first power adjustment signal is configured to control the laser device to adjust to the target optical power.

[0011] In an embodiment, the circuit further comprises a second control module and a calibration module, the second control module is preset with the target optical power, the second control module is electrically connected with the calibration module, and the second control module is further wirelessly connected with the first control module.

[0012] The calibration module is configured to detect a second actual optical power of the laser device and send the second actual optical power to the second control module.

[0013] The second control module is configured to send the target optical power and the second actual optical power to the first control module.

[0014] The first control module is further configured to generate a second power adjustment signal according to the target optical power and the second actual optical power, and the second power adjustment signal is configured to control the laser device to adjust to the target optical power.

[0015] In an embodiment, the calibration module comprises a first photodiode and a key switch, a first end of the first photodiode is electrically connected with the second control module, and a second end of the first photodiode is grounded; a first end of the key switch is electrically connected with the second end of the first photodiode, and a second end of the key switch is electrically connected with the second control module.

[0016] When the key switch is turned on, the first photodiode sends the collected second actual optical power to the second control module.

[0017] In an embodiment, the circuit further comprises an alarm module electrically connected with the second control module; the second control module is further configured to determine a power difference between the target optical power and the second actual optical power, judge whether the power difference belongs to a preset range, send an alarm signal to the alarm module if the power difference belongs to the preset range, and the alarm module is configured to issue an alarm indication when receiving the alarm signal.

[0018] In an embodiment, the monitoring feedback module comprises a second photodiode, the second photodiode is electrically connected with the laser device and the first control module respectively; the second photodiode is configured to detect the first actual optical power of the laser device, generate a corresponding feedback signal, and send the feedback signal to the first control module.

[0019] In an embodiment, the second light-emitting diode is arranged in the laser device, and the second light-emitting diode is configured to obtain a light signal emitted by the laser device and determine the first actual optical power of the laser device according to the light signal.

[0020] In an embodiment, the first control module comprises a first control chip and a control submodule, the first control chip is electrically connected with the voltage conversion module, the second photodiode and the control submodule respectively; the control submodule is further electrically connected with the laser device;

[0021] The first control chip is configured to send an enable signal to the control submodule;

[0022] When the control submodule receives the enable signal, the first control chip is electrically connected with the laser device through the control submodule;

[0023] The first control chip is further configured to determine the first actual optical power according to the feedback signal, and generate the first power adjustment signal according to the target optical power and the first actual optical power;

[0024] The control submodule is configured to divide the voltage of the laser device according to the first power adjustment signal to adjust the laser device to the target optical power.

[0025] In an embodiment, the control submodule comprises an operational amplifier, a first switch tube and a voltage dividing resistor, the first input end of the operational amplifier is electrically connected with the first control chip, the second input end of the operational amplifier is electrically connected with the output end of the first switch tube, the power input end of the operational amplifier is electrically connected with the first control chip, the power output end of the operational amplifier is grounded, and the output end of the operational amplifier is electrically connected with the control end of the first switch tube; the input end of the first switch tube is electrically connected with the laser device, and the output end of the first switch tube is grounded in series with the voltage dividing resistor;

[0026] The operational amplifier is configured to control the first switch tube to be turned on when receiving the power adjustment signal;

[0027] When the first switch tube is turned on, the first control chip is electrically connected with the laser device through the first switch tube;

[0028] The voltage dividing resistor is configured to divide the voltage of the laser device according to the first power adjustment signal to adjust the laser device to the target optical power.

[0029] In an embodiment, the voltage conversion module comprises a voltage regulation chip, the power input end of the voltage regulation chip is electrically connected with an external power supply, the power output end of the voltage regulation chip is electrically connected with the laser device, and the enable end of the voltage regulation chip is electrically connected with the first control chip;

[0030] The first control chip is further configured to send the enable signal to the voltage regulation chip.

[0031] The voltage regulation chip is configured to supply power to the laser device when the enable signal is received.

[0032] In an embodiment, the first control module is further configured to generate the first power adjustment signal according to a power difference between the first actual optical power and the target optical power.

[0033] The present disclosure also provides a laser driving method applied to the laser driving circuit, the method comprising: a voltage conversion module supplying power to a laser device; a monitoring feedback module detecting a first actual optical power of the laser device, generating a corresponding feedback signal, and sending the feedback signal to a first control module; the first control module determining the first actual optical power according to the feedback signal; generating a first power adjustment signal according to a target optical power and the first actual optical power, the first power adjustment signal being configured to control the laser device to adjust to the target optical power.

[0034] The present disclosure also provides a laser driver comprising the laser driving circuit.

[0035] The laser driving circuit provided by the present disclosure comprises: a voltage conversion module supplying power to a laser device; a monitoring feedback module detecting a first actual optical power of the laser device, generating a corresponding feedback signal, and sending the feedback signal to a first control module; the first control module determining the first actual optical power according to the feedback signal; generating a first power adjustment signal according to a target optical power and the first actual optical power, the first power adjustment signal being configured to control the laser device to adjust to the target optical power. The present disclosure detects the actual optical power of each laser device, and adjusts the laser device according to the difference between the actual optical power and the target optical power, thereby realizing consistent control of the light emitting power of the laser device.

[0036] In order to make the above objectives, features and advantages of the present disclosure more apparent and easy to understand, below the preferred embodiments are specifically described with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some of the embodiments of the present disclosure, and therefore should not be considered as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0038] Fig. 1 shows a structural schematic diagram of a laser driving circuit according to an embodiment of the present disclosure;

[0039] Fig. 2 shows another structural schematic diagram of a laser driving circuit according to an embodiment of the present disclosure;

[0040] Fig. 3 shows a circuit schematic diagram of a first control module and a monitoring feedback module according to an embodiment of the present disclosure;

[0041] Fig. 4 shows a circuit schematic diagram of a voltage conversion module according to an embodiment of the present disclosure;

[0042] Fig. 5 shows yet another structural schematic diagram of a laser driving circuit according to an embodiment of the present disclosure;

[0043] Fig. 6 shows a circuit schematic diagram of a second control module and a calibration module according to an embodiment of the present disclosure;

[0044] Fig. 7 shows still another structural schematic diagram of a laser driving circuit according to an embodiment of the present disclosure;

[0045] Fig. 8 shows a circuit schematic diagram of an alarm module according to an embodiment of the present disclosure;

[0046] Fig. 9 shows a flow schematic diagram of a laser driving method according to an embodiment of the present disclosure.

[0047] Main element symbol explanation:

[0048] 100 - laser driving circuit; 110 - monitoring feedback module; 120 - first control module; 121 - first control chip; 122 - control submodule; 130 - voltage conversion module; 140 - laser device; 150 - second control module; 160 - calibration module; 170 - alarm module. DETAILED DESCRIPTION

[0049] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements throughout. The embodiments described below with reference to the drawings are exemplary only, and are used only for explanation of the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0050] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0052] Due to the difference of manufacturing process, the consistency of the light emission of each laser cannot be guaranteed even if the same driving voltage is provided. In order to eliminate the difference, the embodiment of the present disclosure provides a laser driving circuit. Specifically, please refer to FIG. 1, the laser driving circuit 100 comprises a monitoring feedback module 110, a first control module 120, a voltage conversion module 130 and a laser device 140; the monitoring feedback module 110 is electrically connected with the laser device 140 and the first control module 120 respectively; the first control module 120 is also electrically connected with the laser device 140 and the voltage conversion module 130 respectively; and the voltage conversion module 130 is also electrically connected with the laser device 140.

[0053] In the embodiment, in order to ensure the consistency of the optical power of the laser device 140, the optical power of the laser device is adjusted to a target optical power before leaving the factory. After leaving the factory, the actual optical power of the laser device after leaving the factory, i.e. the first actual optical power, is monitored by the monitoring feedback module 110 to form a closed-loop feedback control. Specifically, the first control module 120 compares the first actual optical power with the target optical power, generates a corresponding first power adjustment signal according to the power difference between the first actual optical power and the target optical power, and thus feedback adjusts the optical power of the laser device 140, so that the optical power of the laser device 140 is always equal to or close to the target optical power.

[0054] The voltage conversion module 130 is configured to supply power to the laser device 140.

[0055] In the embodiment, after the voltage conversion module 130 converts the input voltage into the working voltage of the laser device 140, the laser device 140 is supplied with power by the working voltage, so that the laser device 140 emits light.

[0056] The monitoring feedback module 110 is configured to detect the first actual optical power of the laser device 140, generate a corresponding feedback signal, and send the feedback signal to the first control module 120.

[0057] In the embodiment, the actual optical power of the laser device 140 after leaving the factory is detected by the monitoring feedback module 110, i.e., the first actual optical power, a corresponding feedback signal is generated and sent to the first control module 120, and the first actual optical power of the laser device 140 is adjusted by the first control module 120 according to the corresponding feedback signal, so that the first actual optical power of the laser device 140 is consistent with the target optical power. The monitoring feedback module 110 includes a photosensitive device, such as a photodiode, which is configured to detect the actual optical power of the laser device 140.

[0058] In an embodiment, the monitoring feedback module 110 includes a second photodiode D2, which is electrically connected to the laser device 140 and the first control module 120, respectively. The second photodiode D2 is configured to detect the first actual optical power of the laser device 140, generate a corresponding feedback signal, and send the feedback signal to the first control module 120.

[0059] It should be noted that the second photodiode D2 is arranged in the laser device 140. When the laser device 140 emits light, the second photodiode D2 obtains the light signal emitted by the laser device 140, determines the first actual optical power of the laser device 140 according to the light signal, and sends the first actual optical power to the first control module 120. The first control module generates a corresponding first power adjustment signal according to the power difference between the first actual optical power and the target optical power, so as to adjust the optical power of the laser device 140, so that the optical power of the laser device 140 is equal to or close to the target optical power.

[0060] In the embodiment, the photosensitive device included in the monitoring feedback module 110 is the second photodiode D2. In other embodiments, other photosensitive devices can also be selected according to actual conditions, which are not limited herein.

[0061] The first control module 120 is also configured to determine the first actual optical power according to the feedback signal, generate a first power adjustment signal according to the target optical power and the first actual optical power, and the first power adjustment signal is configured to control the laser device 140 to adjust to the target optical power.

[0062] In the embodiment, the first control module 120 compares the first actual optical power of the laser device 140 with the target optical power, generates a corresponding first power adjustment signal according to the power error, and controls the optical power of the laser device 140 to adjust to the target optical power through the first power adjustment signal.

[0063] In an embodiment, referring to FIG. 2, FIG. 2 shows another structural schematic diagram of the laser driving circuit 100 provided by the embodiment of the present disclosure, the first control module 120 comprises a first control chip 121 and a control submodule 122, the first control chip 121 is electrically connected with the voltage conversion module 130, the second photodiode D2 and the control submodule 122 respectively; the control submodule 122 is also electrically connected with the laser device 140; the first control chip 121 is configured to send an enable signal to the control submodule 122; when the control submodule 122 receives the enable signal, the first control chip 121 is electrically connected with the laser device 140 through the control submodule 122; the first control chip 121 is also configured to determine the first actual optical power according to the feedback signal; generate a first power adjustment signal according to the target optical power and the first actual optical power; the control submodule 122 is configured to divide the voltage of the laser device 140 according to the first power adjustment signal, so as to adjust the laser device 140 to the target optical power.

[0064] In the embodiment, the first control chip 121 is electrically connected with the laser device 140 through the control submodule 122, the first control chip 121 determines the first power adjustment signal according to the power difference between the first actual optical power fed back by the second photodiode D2 and the target optical power, wherein the first power adjustment signal is a PWM signal, the control submodule 122 is also configured to divide the voltage of the laser device 140, the first power adjustment signal changes the voltage actually divided by the laser device 140 by controlling the control submodule 122 to divide the voltage of the laser device 140, so as to adjust the optical power of the laser device 140.

[0065] Specifically, please refer to FIG. 3, which shows a circuit schematic diagram of the first control module 120 and the monitoring feedback module 110 provided by the embodiment of the present disclosure. The first control module 120 includes a first control chip 121 and a control submodule 122. The control submodule 122 includes an operational amplifier Q1, a first switch tube Q2, and a voltage dividing resistor R5. The first input end of the operational amplifier Q1 is electrically connected with the first control chip 121. The second input end of the operational amplifier Q1 is electrically connected with the output end of the first switch tube Q2. The power input end of the operational amplifier Q1 is electrically connected with the first control chip 121. The power output end of the operational amplifier Q1 is grounded. The output end of the operational amplifier Q1 is electrically connected with the control end of the first switch tube Q2. The input end of the first switch tube Q2 is electrically connected with the laser device 140. The output end of the first switch tube Q2 is connected with the voltage dividing resistor R5 in series and then grounded. The operational amplifier Q1 is configured to control the first switch tube Q2 to be turned on when receiving the first power adjustment signal. When the first switch tube Q2 is turned on, the first control chip 121 is electrically connected with the laser device 140 through the first switch tube Q2. The voltage dividing resistor R5 is configured to divide the voltage of the laser device 140 according to the first power adjustment signal to adjust the light power of the laser device 140 to the target light power.

[0066] In the embodiment, the second photodiode D2 detects the first actual light power of the laser device 140 after leaving the factory, converts the detected first actual light power into an electrical signal, i.e., a feedback signal, and sends the feedback signal to the first control chip 121. The first control chip 121 determines the first actual light power corresponding to the feedback signal and the target light power to obtain the first power adjustment signal, i.e., the PWMB signal, which needs to be output. After the first input end of the operational amplifier Q1 receives the first power adjustment signal, a high-level signal is output to the control end of the first switch tube Q2, so that the first switch tube Q2 is turned on. Based on the principle of virtual short of the operational amplifier Q1, the voltage between the first input end and the second input end of the operational amplifier Q1 is the same. Therefore, by sending the first power adjustment signal to the first input end of the operational amplifier Q1, the voltage of the voltage dividing resistor R5 is controlled, so that the laser device 140 is divided, and the light power of the laser device 140 is adjusted.

[0067] It should be noted that the first control module 120 further includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a resistor R6.

[0068] In an embodiment, referring to FIG. 4, the voltage conversion module 130 comprises: a voltage regulation chip, a power input end of the voltage regulation chip being electrically connected with an external power supply, a power output end of the voltage regulation chip being electrically connected with the laser device, and an enable end of the voltage regulation chip being electrically connected with the first control chip; the first control chip 121 is further configured to send the enable signal to the voltage regulation chip; and the voltage regulation chip is configured to supply power to the laser device with the working voltage of the laser device when receiving the enable signal.

[0069] In the embodiment, after the voltage regulation chip obtains the enable signal from the first control chip 121, the voltage regulation chip converts the input voltage into the working voltage of the laser device 140, and supplies power to the laser device 140 with the working voltage, so that the laser device 140 emits light. It can be understood that when the voltage regulation chip does not obtain the enable signal, the voltage regulation chip does not supply power to the outside, and the laser device 140 does not emit light.

[0070] It should be noted that the voltage conversion module 130 further comprises a capacitor C6, a capacitor C7, an inductor L, a diode D, a resistor R7, a resistor R8 and a resistor R9, wherein a first end of the capacitor C6 is electrically connected with the external power supply, and a second end of the capacitor C6 is grounded; a first end of the inductor L is electrically connected with the external power supply, and a second end of the inductor L is electrically connected with a SW pin of the voltage regulation chip and a first end of the diode D, respectively; a second end of the diode D is a power output end of the voltage conversion module 130, and the second end of the diode D is further electrically connected with a VS pin of the voltage regulation chip and a first end of the resistor R8, respectively; a second end of the resistor R8 is electrically connected with a first end of the resistor R9, a second end of the resistor R9 is grounded, a first end of the resistor R7 is electrically connected with an enable end EN of the voltage regulation chip, and a second end of the resistor R7 is grounded; and a GND pin of the voltage regulation chip is grounded.

[0071] It should be noted that the first end of the resistor R9 and a FB pin of the voltage regulation chip are further connected with a feedback regulation circuit, which is configured to feedback regulate the output voltage of the voltage regulation chip, so that the voltage regulation chip stably supplies power to the laser device 140.

[0072] In an embodiment, referring to FIG. 5, FIG. 5 shows another structural schematic diagram of the laser driving circuit provided by the embodiment of the present disclosure, the circuit further comprises a second control module 150 and a calibration module 160, the target optical power is preset in the second control module 150, the second control module 150 is electrically connected with the calibration module 160, and the second control module 150 is wirelessly connected with the first control module 120; the calibration module 160 is configured to detect the second actual optical power of the laser device 140 and send the second actual optical power to the second control module 150; the second control module 150 is configured to send the target optical power and the second actual optical power to the first control module 120; and the first control module 120 is further configured to generate a second power adjustment signal according to the target optical power and the second actual optical power, and the second power adjustment signal is configured to control the laser device 140 to adjust to the target optical power.

[0073] In the embodiment, to ensure the optical power consistency of the laser device 140, the optical power of the laser device 140 is adjusted to the target optical power by the second control module 150 and the calibration module 160 before the laser device 140 is shipped, and after the laser device 140 is adjusted to the target optical power, the target optical power is stored in the first control module 120.

[0074] Specifically, referring to FIG. 6, FIG. 6 shows a circuit schematic diagram of the second control module 150 and the calibration module 160 provided by the embodiment of the present disclosure, wherein the second control module 150 comprises a second control chip, and the calibration module 160 comprises a first photodiode D1 and a key switch SW1.

[0075] In an embodiment, the calibration module 160 comprises a first photodiode D1 and a key switch SW1, a first end of the first photodiode D1 is electrically connected with the second control module 150, and a second end of the first photodiode D1 is grounded; a first end of the key switch SW1 is electrically connected with the second end of the first photodiode D1, and a second end of the key switch SW1 is electrically connected with the second control module 150; when the key switch SW1 is turned on, the first photodiode D1 sends the second actual optical power collected to the second control module 150.

[0076] In the embodiment, the first photodiode D1 is configured to collect the light power of the laser device 140, i.e. the second actual light power, before the laser device 140 is shipped. When the key switch SW1 is turned on, the second control chip receives the second actual light power collected by the first photodiode D1. The second control chip sends the second actual light power and the target light power stored in advance to the first control module. The first control module adjusts the light power of the laser device 140 to the target light power according to the power difference between the second actual light power and the target light power. After that, the first control module stores the current target light power, thereby realizing the power calibration before the laser device 140 is shipped.

[0077] It should be noted that the second control chip and the first control module communicate with each other through UART or IIC mode.

[0078] In an embodiment, please refer to FIG. 7, which shows another structural schematic diagram of the laser driving circuit provided by the embodiment of the present disclosure. The circuit further comprises an alarm module 170, which is electrically connected with the second control module 150. The second control module 150 is further configured to determine the power difference between the target light power and the second actual light power, and judge whether the power difference belongs to a preset range. If the power difference belongs to the preset range, the second control module 150 sends an alarm signal to the alarm module 170. The alarm module 170 is configured to send an alarm indication when receiving the alarm signal.

[0079] During the debugging process of the laser device 140 before it is shipped, the alarm module 170 is set to prompt whether the light power of the current laser device 140 reaches the target power. When the light power of the laser device 140 is adjusted to the target light power, the alarm module 170 sends an alarm indication to prompt that the pre-shipment calibration of the current laser device 140 is completed.

[0080] Specifically, please refer to FIG. 8, which shows a circuit schematic diagram of the alarm module 170 provided by the embodiment of the present disclosure. The alarm module 170 comprises two different color LED lights, for example, red and green. When the light power of the laser device 140 is adjusted to the target light power, the indicator light of the first preset color, for example, green, is turned on, indicating that the current calibration is completed. Otherwise, the indicator light of the second preset color, for example, red, is turned on, indicating that the current calibration is in progress. The alarm module 170 further comprises a buzzer Q4, which is configured to send an alarm indication, for example, a beep, when the calibration is completed, to prompt that the current calibration is completed.

[0081] The laser driving circuit provided by the embodiment of the present disclosure comprises: a monitoring feedback module, a first control module, a voltage conversion module and a laser device; the monitoring feedback module is electrically connected with the laser device and the first control module respectively; the first control module is electrically connected with the laser device and the voltage conversion module respectively; the voltage conversion module is electrically connected with the laser device; the voltage conversion module is configured to supply power to the laser device; the monitoring feedback module is configured to detect the first actual optical power of the laser device, generate a corresponding feedback signal, and send the feedback signal to the first control module; the first control module is further configured to determine the first actual optical power according to the feedback signal; generate a first power adjustment signal according to the target optical power and the first actual optical power, and the first power adjustment signal is configured to control the laser device to adjust to the target optical power. The present disclosure adjusts the laser device to the target optical power before leaving the factory, and adjusts the laser device according to the difference between the first actual optical power and the target optical power after leaving the factory, so that the light emitting power of the laser device is consistent.

[0082] In addition, the embodiment of the present disclosure also provides a laser driving method applied to the above-mentioned laser driving circuit, please refer to FIG. 9, the method comprises steps S910-S940.

[0083] Step S910, the voltage conversion module supplies power to the laser device;

[0084] Step S920, the monitoring feedback module detects the first actual optical power of the laser device, generates a corresponding feedback signal, and sends the feedback signal to the first control module;

[0085] Step S930, the first control module determines the first actual optical power according to the feedback signal;

[0086] Step S940, generate a first power adjustment signal according to the target optical power and the first actual optical power, and the first power adjustment signal is configured to control the laser device to adjust to the target optical power.

[0087] The laser driving method provided by the embodiment of the present disclosure should be configured as the laser driving circuit provided by the above-mentioned embodiment 1, to avoid repetition, which will not be repeated here.

[0088] The present disclosure adjusts the laser device to the target optical power before leaving the factory, and adjusts the laser device according to the difference between the first actual optical power and the target optical power after leaving the factory, so that the light emitting power of the laser device is consistent.

[0089] In addition, the embodiment of the present disclosure further provides a laser driver comprising the laser driving circuit.

[0090] The laser driving device provided by the embodiment of the present disclosure can perform all functions of the laser driving circuit provided by the embodiment 1, and thus, the functions are not described here again to avoid repetition.

[0091] In all the examples shown and described herein, any specific values should be interpreted as merely exemplary and not as a limitation, and thus, other examples of the example embodiments can have different values.

[0092] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0093] The above-described embodiments only express several implementation manners of the present disclosure, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present disclosure. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure Industrial applicability:

[0094] The embodiment of the present disclosure provides a laser driving circuit, method and laser driver, by detecting the actual optical power of each laser device, and adjusting the laser device according to the difference between the actual optical power and the target optical power, so as to realize the control of the consistent light power of the laser device.

Claims

1. A laser driving circuit, characterized in that, The circuit includes: a monitoring feedback module, a first control module, a voltage conversion module, and a laser device; The monitoring feedback module is electrically connected to the laser device and the first control module, respectively. The first control module is also electrically connected to the laser device and the voltage conversion module, respectively; The voltage conversion module is also electrically connected to the laser device; The voltage conversion module is configured to supply power to the laser device; The monitoring and feedback module is configured to detect the first actual optical power of the laser device, generate a corresponding feedback signal, and send the feedback signal to the first control module. The first control module is further configured to determine the first actual optical power based on the feedback signal; and to generate a first power adjustment signal based on the target optical power and the first actual optical power, wherein the first power adjustment signal is configured to control the laser device to adjust to the target optical power.

2. The laser driving circuit according to claim 1, characterized in that, The circuit also includes: The second control module and the calibration module are provided. The second control module is preset with the target optical power. The second control module is electrically connected to the calibration module. The second control module is also wirelessly connected to the first control module. The calibration module is configured to detect the second actual optical power of the laser device and send the second actual optical power to the second control module; The second control module is configured to send the target optical power and the second actual optical power to the first control module; The first control module is further configured to generate a second power adjustment signal based on the target optical power and the second actual optical power, wherein the second power adjustment signal is configured to control the laser device to adjust to the target optical power.

3. The laser driving circuit according to claim 2, characterized in that, The calibration module includes: a first photodiode and a push-button switch, wherein a first end of the first photodiode is electrically connected to the second control module, and a second end of the first photodiode is grounded; The first end of the push button switch is electrically connected to the second end of the first photodiode, and the second end of the push button switch is electrically connected to the second control module; When the push-button switch is turned on, the first photodiode transmits the collected second actual optical power. Give it to the second control module.

4. The laser driving circuit according to claim 3, characterized in that, The circuit also includes an alarm module, which is electrically connected to the second control module; The second control module is further configured to determine the power difference between the target optical power and the second actual optical power, and to determine whether the power difference falls within a preset range; if the power difference falls within the preset range, an alarm signal is sent to the alarm module. The alarm module is configured to issue an alarm indication when it receives the alarm signal.

5. The laser driving circuit according to any one of claims 1-4, characterized in that, The monitoring feedback module includes a second photodiode, which is electrically connected to the laser device and the first control module respectively. The second photodiode is configured to detect the first actual optical power of the laser device, generate a corresponding feedback signal, and send the feedback signal to the first control module.

6. The laser driving circuit according to claim 5, characterized in that, The second light-emitting diode is disposed within the laser device and is configured to acquire the light signal emitted by the laser device and determine the first actual light power of the laser device based on the light signal.

7. The laser driving circuit according to any one of claims 5-6, characterized in that, The first control module includes a first control chip and a control submodule. The first control chip is electrically connected to the voltage conversion module, the second photodiode, and the control submodule. The control submodule is also electrically connected to the laser device; The first control chip is configured to send an enable signal to the control submodule; When the control submodule receives the enable signal, the first control chip is electrically connected to the laser device through the control submodule. The first control chip is further configured to determine the first actual optical power based on the feedback signal; and to generate the first power adjustment signal based on the target optical power and the first actual optical power. The control submodule is configured to divide the laser device according to the first power adjustment signal to adjust the laser device to the target optical power.

8. The laser driving circuit according to claim 7, characterized in that, The control submodule includes an operational amplifier, a first switching transistor, and voltage divider resistors. The first input terminal of the operational amplifier is electrically connected to the first control chip, the second input terminal of the operational amplifier is electrically connected to the output terminal of the first switching transistor, the power input terminal of the operational amplifier is electrically connected to the first control chip, the power output terminal of the operational amplifier is grounded, and the output terminal of the operational amplifier is electrically connected to the control terminal of the first switching transistor. The input terminal of the first switching transistor is electrically connected to the laser device, and the output terminal of the first switching transistor is connected in series with the voltage divider resistor and then grounded. The operational amplifier is configured to control the first switching transistor to turn on when the power adjustment signal is received; When the first switch is turned on, the first control chip is electrically connected to the laser device through the first switch; The voltage divider resistor is configured to divide the laser device according to the first power adjustment signal to adjust the laser device to the target optical power.

9. The laser driving circuit according to any one of claims 7-8, characterized in that, The voltage conversion module includes: a voltage regulation chip, the power input terminal of which is electrically connected to an external power source, the power output terminal of which is electrically connected to the laser device, and the enable terminal of which is electrically connected to the first control chip; The first control chip is further configured to send the enable signal to the voltage regulation chip; The voltage regulation chip is configured to supply power to the laser device when it receives the enable signal.

10. The laser driving circuit according to any one of claims 1-9, characterized in that, The first control module is further configured to generate the first power adjustment signal based on the power difference between the first actual optical power and the target optical power.

11. A laser driving method, applied to the laser driving circuit according to any one of claims 1-10, characterized in that, The method includes: The voltage conversion module supplies power to the laser device; The monitoring and feedback module detects the first actual optical power of the laser device, generates a corresponding feedback signal, and sends the feedback signal to the first control module. The first control module determines the first actual optical power based on the feedback signal; and generates a first power adjustment signal based on the target optical power and the first actual optical power, wherein the first power adjustment signal is configured to control the laser device to adjust to the target optical power.

12. A laser driver, characterized in that, The laser driving circuit includes any one of claims 1-10.

Images