Power compensation system and method and laser
By designing a power compensation system in the laser, using the calibration module to obtain the calibration table of the full power segment, and converting the module to output the target current, solving the problem of poor output power consistency of the laser under the constant power control mode, and achieving the compensation and consistency improvement of the full power segment.
Patent Information
- Application Number
- CN202411546707.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-03-11
Smart Images
Figure CN119602068A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field, and in particular to a power compensation system, method and laser. Background Art
[0002] Commonly used laser driving methods include constant current control and constant power control. Although the constant power method can overcome the unstable output power caused by temperature and laser diode attenuation, the inconsistency of key components such as photodiodes, op amps, transistors, etc. in constant power lasers causes poor power consistency of the laser. In order to solve the inconsistency between lasers, a positioner is added to the laser driving circuit. When producing lasers, the positioner inside the laser is adjusted after manual calibration to ensure that the output power of each laser is consistent. On the one hand, this method has a high manufacturing cost, and on the other hand, the inconsistency between lasers is nonlinear and cannot achieve full power compensation. Summary of the invention
[0003] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.
[0004] Some embodiments of the present application propose a power compensation system, method and laser to solve the technical problems mentioned in the above background technology section.
[0005] As a first aspect of the present application, some embodiments of the present application provide a power compensation system, method and laser, including:
[0006] A laser module, used for outputting laser;
[0007] A constant current source module, used for outputting a driving signal to the laser module to control the output power of the laser module;
[0008] A calibration module is used to obtain a calibration table according to the actual power of the laser module and the output light intensity of the laser module; a conversion module is used to output a target current according to the target power and the calibration table to control the constant current source module
[0009] Wherein, the constant current source module is electrically connected to the laser module, the calibration module is electrically connected to the constant current source module, and the conversion module is electrically connected to the constant current source module.
[0010] Optionally, the power compensation system comprises:
[0011] A compensation module, used for compensating the target current output by the conversion module according to the output light intensity of the laser module to output a control signal to the constant current source module;
[0012] Wherein, the compensation module is electrically connected between the conversion module and the constant current source module.
[0013] Optionally, the power compensation system includes:
[0014] A light collection module, used for collecting the output light intensity of the laser module;
[0015] A photoelectric conversion module, used for converting the output light intensity into actual current;
[0016] Wherein, the photoelectric conversion module is electrically connected to the calibration module and the compensation module respectively.
[0017] Optionally, the actual power is acquired by collecting with an optical power meter.
[0018] As a second aspect of the present application, some embodiments of the present application provide a power compensation method, including:
[0019] The conversion module outputs the target current according to the target power and the calibration table;
[0020] The compensation module outputs a control signal to the constant current source module according to the target current and the actual current;
[0021] The constant current source module outputs a driving signal to the laser module according to the control signal.
[0022] Optionally, the control signal is calculated using the following formula:
[0023]
[0024] Where u(t) is the control signal, e(t) is the difference between the target current and the actual current; Kp, Ki, and Kd are PID control parameters, respectively.
[0025] Optionally, the power compensation method further includes:
[0026] The acquisition module acquires the output light intensity of the laser module;
[0027] The photoelectric conversion module converts the output light intensity into actual current and outputs it to the compensation module.
[0028] Optionally, the acquisition period of the acquisition module ranges from 0.5 ms to 2 ms.
[0029] Optionally, it also includes:
[0030] Set target power;
[0031] The calibration module outputs a control signal to the constant current source module according to the target power and the actual power output by the laser module;
[0032] When the target power and actual power are equal, record the target power and actual current value calibration table;
[0033] Increase the target power by the preset power difference and return to execute setting the new target power.
[0034] As a third aspect of the present application, some embodiments of the present application provide a laser, including the power compensation system as described above.
[0035] The beneficial effects of the present application are: providing a power compensation system, method and laser for obtaining a power calibration table of the full power range through a calibration module to achieve full power range compensation. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.
[0037] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.
[0038] In the attached picture:
[0039] Figure 1 is a principle block diagram of a part of a power compensation system according to an embodiment of the present application;
[0040] Figure 2 is a principle block diagram of another part of a power compensation system according to an embodiment of the present application;
[0041] Figure 3 It is a flow chart of the main steps of a power compensation method according to an embodiment of the present application.
[0042] Reference numerals:
[0043] 100. Power compensation system;
[0044] 110, laser module; 120, constant current source module; 130, calibration module; 140, conversion module; 150, compensation module; 160, light collection module; 170, photoelectric conversion module; 180, calibration table;
[0045] 200. Optical power meter. DETAILED DESCRIPTION
[0046] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.
[0047] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.
[0048] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.
[0049] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".
[0050] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.
[0051] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.
[0052] like Figure 1 and Figure 2 As shown, the present application discloses a power compensation system 100 , including: a laser module 110 , a constant current source module 120 , a calibration module 130 and a conversion module 140 .
[0053] The laser module 110 is used to output laser; the constant current source module 120 is electrically connected to the laser module 110, and is used to output a driving signal to the laser module 110 to control the output power of the laser module 110; the calibration module 130 is electrically connected to the constant current source module 120, and is used to obtain a calibration table 180 according to the actual power of the laser module 110 and the output light intensity of the laser module 110; the conversion module 140 is electrically connected to the constant current source module 120, and is used to output a target current according to the target power and the calibration table 180 to control the constant current source module 120.
[0054] By adopting the above technical solution, the power calibration table 180 of the full power range is obtained through the calibration module 130 to achieve full power range compensation. At the same time, since the calibration is automatically performed through the calibration module 130, the required resources and time can be reduced.
[0055] As a specific solution, the constant current source module 120 uses a constant current source implemented by an operational amplifier and a triode. The functions of the calibration module 130 and the conversion module 140 are all implemented by a program on the CPU.
[0056] In some embodiments, the power compensation system 100 includes: a compensation module 150 .
[0057] The compensation module 150 is electrically connected between the conversion module 140 and the constant current source module 120, and is used to compensate the target current output by the conversion module 140 according to the output light intensity of the laser module 110 to output a control signal to the constant current source module 120;
[0058] As a specific solution, the compensation module 150 includes an operational amplifier, and the operational amplifier is used to implement the PID control circuit.
[0059] In some embodiments, the power compensation system 100 includes: a light collection module 160 and a photoelectric conversion module 170140.
[0060] The light collection module 160 is used to collect the output light intensity of the laser module 110; the photoelectric conversion modules 170140 are respectively electrically connected to the light collection module 160, the calibration module 130 and the compensation module 150, and are used to convert the output light intensity into actual current;
[0061] As a specific solution, the photoelectric conversion module 170140 includes an operational amplifier, a sampling resistor and a photodiode (PD). After the photodiode signal is irradiated by light, it generates a current signal, which is converted into a voltage through the sampling resistor and then amplified by the operational amplifier.
[0062] In some embodiments, the actual power is acquired by collecting the power through an optical power meter 200 .
[0063] The present application also discloses a power compensation method, including a calibration mode and an operation mode.
[0064] In the running mode, Figure 3 As shown, the power compensation method includes the following main steps:
[0065] S110: The conversion module outputs the target current according to the target power and the calibration table;
[0066] S120: The compensation module outputs a control signal to the constant current source module according to the target current and the actual current;
[0067] S130: The constant current source module outputs a driving signal to the laser module according to the control signal.
[0068] In some embodiments, the control signal is calculated using the following formula:
[0069]
[0070] Where u(t) is the control signal, e(t) is the difference between the target current and the actual current; Kp, Ki, and Kd are PID control parameters, respectively.
[0071] In some embodiments, the power compensation method further includes:
[0072] S210: A collection module collects the output light intensity of the laser module;
[0073] S220: The photoelectric conversion module converts the output light intensity into actual current and outputs it to the compensation module.
[0074] In some embodiments, the acquisition period of the acquisition module ranges from 0.5 ms to 2 ms. Preferably, the acquisition period of the acquisition module is 1 ms.
[0075] In some embodiments, in the calibration mode, the power compensation method further includes the following main steps:
[0076] S310: Setting target power;
[0077] S320: The calibration module outputs a control signal to the constant current source module according to the target power and the actual power output by the laser module;
[0078] S330: When the target power and the actual power are equal, a calibration table of the target power and the actual current value is recorded.
[0079] S340: Increase the target power by a preset power difference, and return to execute setting a new target power.
[0080] Exemplarily, the target power is set to 0.1mw; the control signal u(t) is calculated based on the target power and actual power in combination with the PID formula, with a control period of 1ms. When the target power and actual power are equal, the target power and actual current are recorded and saved in the calibration table; the target power is +0.1mw, and the above calibration is repeated until the maximum power of the laser is reached.
[0081] In some embodiments, calibration work can also be performed simultaneously in the operating mode, and the calibration table is continuously updated to ensure that the performance degradation caused by the use time of the laser module or the influence of environmental factors such as temperature can be adapted.
[0082] The present application also discloses a laser, characterized in that it comprises the power compensation system as described above.
[0083] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.
Claims
1. A power compensation system, characterized in that: include: A laser module, used for outputting laser; A constant current source module, used for outputting a driving signal to the laser module to control the output power of the laser module; A calibration module, used for obtaining a calibration table according to the actual power of the laser module and the output light intensity of the laser module; A conversion module, used to output a target current according to the target power and the calibration table to control the constant current source module Wherein, the constant current source module is electrically connected to the laser module, the calibration module is electrically connected to the constant current source module, and the conversion module is electrically connected to the constant current source module.
2. The power compensation system according to claim 1, characterized in that: The power compensation system comprises: A compensation module, used for compensating the target current output by the conversion module according to the output light intensity of the laser module to output a control signal to the constant current source module; Wherein, the compensation module is electrically connected between the conversion module and the constant current source module.
3. The power compensation system according to claim 2, characterized in that: The power compensation system comprises: A light collection module, used for collecting the output light intensity of the laser module; A photoelectric conversion module, used for converting the output light intensity into actual current; Wherein, the photoelectric conversion module is electrically connected to the calibration module and the compensation module respectively.
4. The power compensation system according to claim 1, characterized in that: The actual power is acquired by collecting data through an optical power meter.
5. A power compensation method, characterized in that: include: The conversion module outputs the target current according to the target power and the calibration table; The compensation module outputs a control signal to the constant current source module according to the target current and the actual current; The constant current source module outputs a driving signal to the laser module according to the control signal.
6. The power compensation method according to claim 5, characterized in that: The control signal is calculated using the following formula: Among them, u(t) is the control signal, e(t) is the difference between the target current and the actual current; Kp, Ki, and Kd are PID control parameters respectively.
7. The power compensation method according to claim 5, characterized in that: The power compensation method further comprises: The acquisition module acquires the output light intensity of the laser module; The photoelectric conversion module converts the output light intensity into actual current and outputs it to the compensation module.
8. The power compensation method according to claim 7, characterized in that: The acquisition period of the acquisition module ranges from 0.5 ms to 2 ms.
9. The power compensation method according to claim 5, characterized in that: Also includes: Set target power; The calibration module outputs a control signal to the constant current source module according to the target power and the actual power output by the laser module; When the target power and actual power are equal, record the target power and actual current value calibration table; Increase the target power by the preset power difference and return to execute setting the new target power.
10. A laser, characterized in that: Comprising a power compensation system as described in any one of claims 1 to 4.