High-compatibility low-energy-consumption laser driving system
By employing an FPGA chip and an adjustable output current switching regulator in the laser driver system, a highly compatible and low-power laser driver was achieved, solving the problems of insufficient compatibility and high power consumption in existing systems. This enabled high-precision current and voltage regulation and flexible laser driving, making it suitable for lidar detection and optical communication.
Patent Information
- Application Number
- CN202520057326.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-10
AI Technical Summary
Existing laser drive systems suffer from insufficient compatibility, high energy consumption, complex circuitry, insufficient flexibility in output current and voltage, and weak system computing performance, making it difficult to meet the requirements for high flexibility and high efficiency in laser driving.
A highly compatible and low-power laser driving system was designed, using an FPGA chip as the main control module, combined with an adjustable output current switching regulator and an adjustable switching frequency power supply module, including A/D and D/A converters, to achieve high-precision continuous adjustment of output voltage and current, support high-power laser driving, and strong parallel processing capability.
It achieves high-precision continuous adjustment of output voltage (0-55V) and output current (0-20A), with a maximum power of 1100W. It is suitable for lidar detection and optical communication, reducing energy loss, improving system flexibility and compatibility, and reducing heat and size.
Smart Images
Figure CN223771555U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of fiber laser electrical control equipment technology, specifically to a highly compatible and low-power laser driving system. Background Technology
[0002] Lasers, characterized by high brightness, significant monochromaticity, strong coherence, and stable output, have been widely applied in industrial processing, space exploration, and biomedicine, such as lidar detection, bioimaging, and optical communication. As a crucial component of laser systems, the driving power supply significantly impacts laser performance, placing higher demands on the stability and energy consumption of driving power supplies in the development of high-performance lasers. Therefore, designing a low-energy-consumption, intelligent, and highly compatible laser driving system is of great significance for promoting the development of high-performance lasers.
[0003] Currently, laser driver constant current source designs based on switching power supplies can significantly improve power efficiency, and stable and safe laser power supply control systems based on various controllers have also been developed. However, existing laser driver systems suffer from insufficient compatibility and limited flexibility. But with the widespread and in-depth application of lasers, laser driver systems are destined to develop towards higher intelligence and greater flexibility while ensuring safety and stability. Therefore, it is necessary to design new intelligent laser driver systems with high compatibility and low power consumption to overcome the following problems:
[0004] 1. High power consumption and complex circuit: Traditional constant current sources are usually manufactured by linear power supplies composed of operational amplifiers and MOSFETs. However, such linear power supplies are inefficient, generate a lot of heat, and have high requirements for heat dissipation and front-end power energy, which has a significant impact on the system's performance. In addition, they are large in size, which is not conducive to large-scale circuit design of the whole machine. To achieve a high-stability and high-precision switching power supply, a complex circuit design is usually required, which will place a heavy burden on debugging and maintenance work.
[0005] 2. Insufficient flexibility in output current and voltage; the power range of the laser pump source is wide and the operating voltage and current requirements are different. Existing constant current sources are difficult to simultaneously meet the independent controllability of output voltage and output current over a wide range; in addition, the existing power supply has a low repetition frequency, which is not conducive to high repetition frequency pulsed laser pumping. All of these factors result in insufficient compatibility of the drive system.
[0006] 3. The system is complex and has weak computing performance; the serial processing of data by the DSP and STM32 microcontroller results in high power consumption, which is not conducive to the implementation of complex power management. Furthermore, the joint control of the DSP and FPGA is costly and has no obvious advantage in the implementation of laser drive systems. Utility Model Content
[0007] To address the aforementioned technical issues, this application proposes a highly compatible, low-power laser driving system, comprising: a main control module, a power supply module, and a pump source; the main control module, the power supply module, and the pump source are electrically connected in sequence.
[0008] The power module includes a switching regulator with adjustable output current and external circuitry connected to the switching regulator with adjustable output current.
[0009] The adjustable output current switching regulator, together with the external circuitry, constitutes: a power input and monitoring module, a chip enable module, a switching frequency setting module, an output current control module, a pulse control module, an output voltage control module, an output module, and a current monitoring module.
[0010] The above technical solution enables high-precision continuous adjustment of output voltage and output current, thereby enabling high-power laser driving and applicable to fields such as lidar detection and optical communication.
[0011] Specifically, the main control module uses an FPGA chip.
[0012] Specifically, the main control module also includes: an A / D converter and a D / A converter; the A / D converter and the D / A converter are respectively connected to the power supply module; the A / D converter is a 12-bit eight-channel AD chip, configured to acquire the pin voltage of the current monitoring module and transmit it to the FPGA chip; the D / A converter is a 12-bit two-channel DA chip, which outputs analog voltage in response to the FPGA chip's instructions.
[0013] The above technical solution allows for the flexible addition of DA chips to achieve multi-pump drive as needed.
[0014] Specifically, the power supply module is a voltage-controlled constant current source, with an output voltage of 0-55V and an output current of 0-20A.
[0015] In the above technical solution, the power supply module provides driving current for the laser pump, controls the laser power and operating mode, and provides fault detection.
[0016] Specifically, the switching frequency setting module is configured to control the switching frequency, with a switching frequency control range of 200KHz to 1MHz.
[0017] Specifically, the voltage value output by the current monitoring module is linearly related to the current value output by the power supply module.
[0018] Specifically, the chip enable module is configured to control the on / off state of the internal circuitry of the adjustable output current switching regulator.
[0019] Specifically, the current input and monitoring module is configured to connect to an external power supply to enable system power supply and safety monitoring;
[0020] The output current control module responds to the analog voltage output by the D / A converter and outputs current linearly.
[0021] The pulse control module responds to the PWM signal output by the main control module and modulates the output current;
[0022] The output voltage control module is configured to control the output voltage value;
[0023] The output module is connected to the pump source.
[0024] Specifically, the adjustable output current switching regulator is a step-down drive controller, specifically including the LT3763 chip.
[0025] Specifically, the A / D converter and the D / A converter can use 16-bit or higher chips.
[0026] Compared with the prior art, the beneficial results of this application are as follows:
[0027] 1. Achieves highly flexible voltage and current control with high compatibility;
[0028] (1) It can achieve high-precision continuous adjustment of output voltage 0-55V and output current 0-20A, and the power can reach up to 1100W. It can drive high-power lasers and can be applied to fields such as laser radar detection and optical communication. At the same time, the output value can maintain high precision even in low voltage and low current conditions, and is suitable for driving various low-power lasers.
[0029] (2) It can output a duty cycle adjustable current with a frequency of 0-100KHz. From the perspective of high efficiency and energy saving, synchronous pumping of pulsed laser can reduce energy loss and reduce the impact of a large amount of heat generated by continuous operation of the pump source on the system performance. Through the drive control with adjustable repetition rate and duty cycle, it is not only applicable to pulsed laser pumping with a wide repetition rate range, but also has great potential in the internal modulation technology in the field of optical communication.
[0030] 2. The switching power supply is small in size, highly efficient, and energy-saving;
[0031] 3. Using FPGA offers high flexibility and strong parallel processing capabilities.
[0032] (1) FPGA is hardware programmable; in laser systems with multiple pump requirements, compared with the fixed number of DA outputs of STM32, FPGA can flexibly expand DA chips to realize parallel driving of multiple pumps.
[0033] (2) FPGA has strong computing power; one of the biggest advantages of FPGA is its excellent parallel processing capability. Traditional microcontrollers usually use serial processing, which can easily create bottlenecks when processing tasks. However, the architecture design of FPGA allows multiple operations to be executed in parallel, which is beneficial for the design of complex power systems. Attached Figure Description
[0034] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of this application. Other embodiments and many anticipated advantages of these embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.
[0035] Figure 1 This is a schematic diagram of a highly compatible, low-power laser driving system according to an embodiment of this application;
[0036] Figure 2 This is a simplified circuit diagram of a power module for a highly compatible, low-power laser driving system according to an embodiment of this application.
[0037] Figure 3 This is a flowchart of a highly compatible, low-power laser driving system according to an embodiment of this application.
[0038] The meaning of each number in the diagram:
[0039] 1. Human-machine interaction module; 2. Main control module; 3. Power supply module; 4. Power input and monitoring module; 5. Chip enable module; 6. Switching frequency setting module; 7. Output current control module; 8. Pulse control module; 9. Output voltage control module; 10. Output module; 11. Current monitoring module. Detailed Implementation
[0040] In the following detailed description, reference is made to the accompanying drawings, which form part of the detailed description and illustrate illustrative specific embodiments in which the present application may be practiced. In this regard, directional terms such as “top,” “bottom,” “left,” “right,” “up,” “down,” etc., are used with reference to the orientation of the described figures. Because components of the embodiments can be positioned in several different orientations, directional terms are used for illustrative purposes and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present application. Therefore, the following detailed description should not be taken in a limiting sense, and the scope of the present application is defined by the appended claims.
[0041] like Figure 1-2As shown, a highly compatible and low-power laser driving system includes: a main control module 2, a power supply module 3, and a pump source; the main control module 2, the power supply module 3, and the pump source are electrically connected in sequence.
[0042] The power module 3 includes a switching regulator with adjustable output current and an external circuit connected to the switching regulator with adjustable output current.
[0043] The adjustable output current switching regulator, together with the external circuitry, constitutes: power input and monitoring module 4, chip enable module 5, switching frequency setting module 6, output current control module 7, pulse control module 8, output voltage control module 9, output module 10, and current monitoring module 11.
[0044] Specifically, the main control module 2 uses an FPGA chip.
[0045] Specifically, the main control module 2 also includes: an A / D converter and a D / A converter; the A / D converter and the D / A converter are respectively connected to the power supply module 3; the A / D converter is a 12-bit eight-channel AD chip, configured to acquire the pin voltage of the current monitoring module 11 and transmit it to the FPGA chip; the D / A converter is a 12-bit two-channel DA chip, which outputs analog voltage in response to the FPGA chip's instructions.
[0046] Specifically, power module 3 is a voltage-controlled constant current source.
[0047] Specifically, the switching frequency setting module 6 is configured to control the switching frequency, with a switching frequency control range of 200KHz to 1MHz.
[0048] Specifically, the voltage value output by the current monitoring module 11 is linearly related to the current value output by the power supply module 3.
[0049] Specifically, the chip enable module 5 is configured to control the on / off state of the internal circuitry of the adjustable output current switching regulator.
[0050] Specifically, the current input and monitoring module is configured to connect to an external power supply to enable system power supply and safety monitoring;
[0051] The output current control module 7 responds to the analog voltage output by the D / A converter and outputs current linearly;
[0052] The pulse control module 8 responds to the PWM signal output by the main control module 2 and modulates the output current;
[0053] Output voltage control module 9 is configured to control the output voltage value;
[0054] Output module 10 is connected to the pump source.
[0055] To better illustrate this application, a specific embodiment is provided, and further references are made. Figure 2 In this example, the adjustable output current switching regulator is a step-down drive controller of model LT3763. The power module 3 can be divided into eight parts: the power input and monitoring module 4 is connected to an external power supply to achieve system power supply and safety monitoring; the chip enable module 5 activates the internal core circuit of the chip when the voltage exceeds a certain threshold; the switching frequency setting module 6 controls the switching frequency of the system from 200kHz to 1MHz by changing the resistance value of the external resistor; the output current control module 7 achieves linear control of the output current by controlling the analog voltage output by the DA chip; the pulse control module 8 modulates the output current under the control of the PWM signal input by the main control module; the output voltage module 9 determines the output voltage value by voltage division using an external resistor; the output module 10 generates the output through the external circuitry and the internal core circuit of the chip, and is connected to the laser pump; the voltage value output by the current monitoring module 11 is linearly correlated with the output current value of the power module within a certain range, and the main control module monitors the output current value by acquiring this voltage value.
[0056] In this embodiment, the LT3763 is used as the core of the power module. Compared with linear power supplies, it is smaller in size, more efficient, and generates less heat, which reduces the burden on the front-end power grid and system heat dissipation in high-power drive scenarios. Compared with other complex switching power supplies, the power module design based on this chip has a simple peripheral circuit, which is easy to design and maintain. Overall, especially under the requirement of multi-stage pumps, it can reduce the design difficulty in terms of overall space and system heat dissipation.
[0057] In another specific embodiment, an FPGA and an LT3763 chip are used; this application includes:
[0058] (1) Power module
[0059] The power supply module is a voltage-controlled constant current source, which is a simple combination circuit of a high-current switching step-down drive controller LT3763 and an external MOSFET. It provides drive current for laser pump, controls laser power and operating mode, and provides fault detection.
[0060] (2) Main control module
[0061] Centered on an FPGA, the system includes a 12-bit eight-channel AD chip, a 12-bit two-channel DA chip, and interface circuitry. The FPGA communicates with the host computer via a serial port, receives control commands from the host computer, and feeds back monitoring signals to the host computer. The DA chip outputs an analog voltage under the control of the FPGA. This analog voltage is linearly related to the output current of the power supply module. The AD chip collects the voltage of the chip current monitoring pin and transmits it to the FPGA.
[0062] In addition, for scenarios with high accuracy requirements, 16-bit chips such as AD5686R can be used for D / A converters and A / D converters; at the same time, the power module chips can also be replaced with other switching regulators with adjustable output current, such as MAX16832.
[0063] It is obvious that those skilled in the art can make various modifications and alterations to the embodiments of this application without departing from the spirit and scope of this application. In this way, this application also aims to cover such modifications and alterations if they fall within the scope of the claims and their equivalents. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not indicate that a combination of these measures cannot be used for profit. Any reference numerals in the claims should not be considered as limiting the scope.
Claims
1. A high compatibility low power consumption laser driver system, characterized in that, The utility model relates to a kind of laser pumping power supply, including: main control module, power module and pump source;The main control module, the power module and the pump source are electrically connected in turn; The power module includes an output current adjustable switching regulator and an external circuit connected to the output current adjustable switching regulator. The output current adjustable switching regulator and the external circuit together constitute a power input and monitoring module, a chip enable module, a switching frequency setting module, an output current control module, a pulse control module, an output voltage control module, an output module and a current monitoring module. The main control module uses an FPGA chip.
2. A high compatibility low energy consumption laser driver system according to claim 1, characterized in that, The main control module further includes an A / D converter and a D / A converter.
3. A high compatibility low energy consumption laser driver system according to claim 2, wherein, The A / D converter is a 12-bit eight-channel AD chip configured to collect the pin voltage of the current monitoring module and transmit it to the FPGA chip.
4. The high compatibility low power consumption laser driver system according to claim 1, wherein, The D / A converter is a 12-bit two-channel DA chip that outputs an analog voltage in response to the FPGA chip instructions.
5. The high compatibility low power consumption laser driver system according to claim 1, wherein, The power module is a voltage-controlled constant current source, and the output voltage of the power module is 0-55V, and the output current is 0-20A.
6. The high compatibility low power consumption laser driver system according to claim 1, wherein, The switching frequency setting module is configured to control the switching frequency, and the switching frequency control range is 200KHz to 1MHz.
7. The high compatibility low power consumption laser driver system according to claim 1, wherein, The voltage value output by the current monitoring module is linearly related to the output current value of the power module.
8. The high compatibility low power consumption laser driver system according to claim 3, wherein, The chip enable module is configured to control the on-off of the internal circuit of the output current adjustable switching regulator. The current input and monitoring module is configured to connect with an external power supply to realize system power supply and safety detection. The output current control module linearly outputs current in response to the analog voltage output by the D / A converter. The pulse control module modulates the output current in response to the PWM signal output by the main control module. The output voltage control module is configured to control the output voltage value.
9. The high compatibility low power consumption laser driver system according to claim 1, wherein, The output module is connected to the pump source.
10. The high compatibility low power consumption laser driver system according to claim 3, wherein, The output current adjustable switching regulator is a step-down type drive controller, specifically including an LT3763 chip. The A / D converter and the D / A converter can use 16-bit or higher chips.