Optical fiber energy supply system and method for measuring instrument and optical energy conversion power supply

Abstract

The invention discloses an optical fiber energy supply system and method for a measuring instrument and an optical energy conversion power supply, the optical fiber energy supply system comprises a power utilization end, and the power utilization end comprises a photoelectric conversion module, a far-end electric energy conversion module, a power supply monitoring module and an optical energy transmission control module. The photoelectric conversion module is used for converting optical energy input by an optical fiber into electric energy to obtain a first power supply, the far-end electric energy conversion module is used for converting the first power supply into a second power supply to serve as a working power supply of a load, and the power supply monitoring module is used for monitoring electrical parameters of the first power supply and the second power supply; and the light energy transmission control module is used for controlling the output power of the photoelectric conversion module to be maintained in a maximum power point and a low-resistance state specific stable region by adjusting the electrical parameters of the second power supply when the output of the second power supply is not smaller than the starting voltage value. The output power of the photoelectric conversion module is set in a double-closed-loop control mode, so that the energy loss of photoelectric conversion is reduced, the actual working temperature is reduced, and the reliability of the photoelectric conversion module is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of power supply for measuring instruments and equipment, and in particular to an optical fiber power supply system and method for measuring instruments, and a light energy conversion power supply. Background Art

[0002] Power over Fiber (PoF) is a technology that transmits light energy through optical fibers and converts the light energy into electrical energy at the remote end through a photovoltaic power converter (PPC), thereby powering remote devices.

[0003] Please refer to Figure 1 , is a structural functional block diagram of an optical fiber energy supply system in one embodiment. The basic operating principle of the optical fiber energy supply system can be summarized as an "electric-to-optical-to-electrical" conversion process. It includes a power supply end 100 and a power consumption end 200. The power supply end 100 is used to convert electrical energy into optical energy and transmit the converted optical energy to the power consumption end 200 via optical fiber. The power supply end 100 includes a power supply module 1, an electro-optical conversion module 2, and an electro-optical conversion control module 3. The power supply module 1 is used to provide the operating power of the optical fiber energy supply system. The electro-optical conversion module 2 is used to convert electrical energy into optical energy using a high-power laser source (semiconductor laser diode, LD). The electro-optical conversion control module 3 is used to control the power of the optical energy output by the electro-optical conversion module 2. The power-consuming end 200 includes a photoelectric conversion module 4, a remote power conversion module 5, a load 6, a power supply monitoring module 7 and an optical energy transmission control module 8. The photoelectric conversion module 4 is used to receive laser light transmitted by an optical fiber through a photoelectric converter (PPC) and convert optical energy into electrical energy. The remote power conversion module 5 is used to adjust the power supply parameters of the electrical energy obtained by converting the optical energy according to the power demand of the load 6 to provide working power for the load 6. The power supply monitoring module 7 is used to monitor the input and output electrical energy parameters of the remote power conversion module 5 and send them to the optical energy transmission control module. The optical energy transmission control module 8 is used to obtain photoelectric conversion parameters based on the input and output electrical energy parameters of the remote power conversion module 5 and send them to the electro-optical conversion control module 3. The electro-optical conversion control module 3 is used to set the optical energy output power of the electro-optical conversion module 2 based on the photoelectric conversion parameters.

[0004] Because fiber optic power systems transmit energy through optical fibers, which are made of dielectric materials (glass / plastic), they are non-conductive and spark-proof. This makes them unparalleled in safety in flammable and explosive environments (such as the oil and gas, chemical, and coal mining industries) and high-voltage environments (such as power system monitoring). Furthermore, fiber optic transmission of light energy is electromagnetic interference-free (fiber optic transmission is neither affected by nor generates electromagnetic interference, enabling stable operation in strong electromagnetic environments), electrically isolated (perfectly isolating remote devices from the power supply, preventing damage to equipment caused by ground loops, potential differences, and lightning surges), and boasts long-distance transmission (fiber optic cables offer extremely low loss, enabling kilometer-scale energy transmission, whereas copper cables suffer significant losses over long distances due to resistance). Furthermore, fiber optic cables are lightweight and compact (fiber optic cables are lighter and thinner than copper power cables of the same length). However, fiber-optic power supply systems still have limitations, such as low overall efficiency (although the photoelectric conversion efficiency itself is not low, after the two conversions of "electricity->photoelectricity->electricity", the total system efficiency is usually much lower than direct power transmission), high cost (high-power lasers and special photoelectric converters (PPC) are both expensive components, resulting in higher initial system costs than traditional power supply methods), power limitations (limited by laser power, fiber power carrying capacity and PPC conversion efficiency, the power currently provided by PoF systems is usually in the watt range), and difficult thermal management (high-power lasers and PPCs at the receiving end generate heat during the conversion process). These limitations have greatly affected their application areas. Summary of the Invention

[0005] The main technical problem solved by the present invention is how to improve the reliability of the optical fiber energy supply system.

[0006] According to a first aspect, an embodiment provides an optical fiber energy supply system for a measuring instrument, comprising a power-consuming end, which receives light energy through an optical fiber and converts the received light energy into electrical energy to provide operating power for a load; The power consumption end includes a photoelectric conversion module, a remote power conversion module, a power supply monitoring module and a light energy transmission control module; The photoelectric conversion module is used to receive the laser transmitted by the optical fiber through the photoelectric converter and convert the light energy into electrical energy to obtain the first power supply; The remote power conversion module is used to convert the first power supply into a second power supply according to a preset power supply parameter, and use the second power supply as the working power supply of the load; The power supply monitoring module is used to monitor the electrical parameters of the first power supply and the second power supply, and send them to the optical energy transmission control module; The optical energy transmission control module is used to obtain power adjustment parameters of the laser received by the photoelectric conversion module based on the electrical parameters of the first power supply, and send the power adjustment parameters to the power supply end of the optical fiber energy supply system to adjust the optical energy power of the laser transmitted by the optical fiber so that the output voltage value of the first power supply is not less than a preset starting voltage value Vset; wherein the starting voltage value Vset is a preset minimum voltage value of the second power supply output by the remote power conversion module; The optical energy transmission control module is also used to control the output power of the photoelectric conversion module to maintain within the maximum power point and the specific stable region of the low-resistance state by adjusting the electrical parameters of the second power supply when the output voltage value of the second power supply is not less than the starting voltage value Vset. The specific stable region of the low-resistance state is a curve segment on the current-voltage curve of the power conversion parameters of the photoelectric conversion module, and the tangent slope of the point on the power-voltage curve corresponding to any point on the curve segment is less than 0.

[0007] In one embodiment, the electrical parameters of the first power supply monitored by the power supply monitoring module include the operating current I1 and the operating voltage V1 of the first power supply, and the electrical parameters of the second power supply include the operating voltage V2 of the second power supply; The optical energy transmission control module is further configured to output an internal resistance adjustment signal to the remote power conversion module, and the remote power conversion module is configured to set electrical parameters of the second power supply according to the internal resistance adjustment signal to change the equivalent resistance of the external load compared to the power output of the photoelectric conversion module; When the operating voltage V2 of the second power supply is not less than the starting voltage value Vset, the optical energy transmission control module is used to control the value of the external load equivalent resistance of the photoelectric conversion module to be not less than the current value of the internal impedance of the photoelectric conversion module through the internal resistance adjustment signal, so that the output power of the photoelectric conversion module is maintained within the specific stable region between the maximum power point and the low-resistance state.

[0008] In one embodiment, when the operating voltage V2 of the second power supply is less than the starting voltage value Vset, the optical energy transmission control module is used to send the power adjustment parameter to the power supply end of the optical fiber power supply system, so that the power supply end can increase the optical energy power of the laser transmitted by the optical fiber according to the power adjustment parameter.

[0009] In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply; The remote power conversion module includes a Boost converter for converting the first power supply into the second power supply; The Boost converter includes a controlled switch tube Q1, a unidirectional conducting tube D1, a first capacitor C1, a second capacitor C2 and a first inductor L1; The controlled switch tube Q1 includes a positive connection terminal, a negative connection terminal, and a controlled signal input terminal; the controlled signal input terminal is used to input the internal resistance adjustment signal; the negative connection terminal of the controlled switch tube Q1 is connected to the negative output terminal of the photoelectric conversion module and is used to serve as the negative output terminal of the second power supply; the controlled switch tube Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal; One end of the first inductor L1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the positive connection terminal of the controlled switch tube Q1; One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module; The positive connection end of the one-way conducting tube D1 is connected to the positive connection end of the controlled switch tube Q1, and the negative connection end of the one-way conducting tube D1 is connected to the load, so as to serve as the positive output end of the second power supply; One end of the second capacitor C2 is connected to the negative connection end of the unidirectional conducting tube D1 , and the other end is connected to the negative connection end of the controlled switch tube Q1 .

[0010] In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply; The remote power conversion module includes a Buck converter for converting the first power supply into the second power supply; The Buck converter includes a controlled switch tube Q1, a unidirectional conducting tube D1, a first capacitor C1, a second capacitor C2 and a first inductor L1; The controlled switch tube Q1 includes a positive connection terminal, a negative connection terminal and a controlled signal input terminal; the controlled signal input terminal is used to input the internal resistance adjustment signal; the controlled switch tube Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal; One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module; The positive connection end of the controlled switch tube Q1 is connected to the positive output end of the photoelectric conversion module, and the negative connection end of the controlled switch tube Q1 is connected to the negative connection end of the unidirectional conduction tube D1; The positive electrode connection end of the one-way conducting tube D1 is connected to the negative output end of the photoelectric conversion module and is used as the negative output end of the second power supply; One end of the first inductor L1 is connected to the negative electrode connection end of the unidirectional conduction tube D1, and the other end is used as the positive output end of the second power supply; One end of the second capacitor C2 is connected to the positive output end of the second power supply, and the other end is connected to the positive electrode of the unidirectional conducting tube D1.

[0011] In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply; The remote power conversion module includes a Buck-Boost converter for converting the first power supply into the second power supply; The Buck-Boost converter includes a controlled switch tube Q1, a unidirectional conducting tube D1, a first capacitor C1, a second capacitor C2 and a first inductor L1; The controlled switch tube Q1 includes a positive connection terminal, a negative connection terminal and a controlled signal input terminal; the controlled signal input terminal is used to input the internal resistance adjustment signal; the controlled switch tube Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal; One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module; The positive connection end of the controlled switch tube Q1 is connected to the positive output end of the photoelectric conversion module, and the negative connection end of the controlled switch tube Q1 is connected to the negative connection end of the unidirectional conduction tube D1; The positive electrode connection end of the one-way conducting tube D1 is used as the positive output end of the second power supply; One end of the first inductor L1 is connected to the negative electrode connection end of the unidirectional conducting tube D1, and the other end is used as the negative output end of the second power supply; One end of the second capacitor C2 is connected to the negative output end of the second power supply, and the other end is connected to the positive electrode of the unidirectional conducting tube D1.

[0012] In one embodiment, the controlled switch tube Q1 is a MOS switch tube; the unidirectional conducting tube D1 is a diode; the internal resistance adjustment signal is a pulse signal with adjustable pulse width; When the internal resistance adjustment signal is at a high level, the MOS switch tube is turned on to electrically connect the positive connection terminal and the negative connection terminal of the controlled switch tube Q1; When the internal resistance adjustment signal is at a low level, the MOS switch tube is turned off to disconnect the positive connection terminal and the negative connection terminal of the controlled switch tube Q1 .

[0013] According to a second aspect, an embodiment provides an optical fiber energy supply method for a measuring instrument, which is applied to the optical fiber energy supply system according to the first aspect, and the optical fiber energy supply method includes: Obtaining a current-voltage curve and a power-voltage curve from power conversion parameters of the photoelectric conversion module; Obtaining a maximum power point and a low-resistance-state specific stable region based on the current-voltage curve and the power-voltage curve; wherein the low-resistance-state specific stable region is a curve segment on the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and a tangent slope of a point on the power-voltage curve corresponding to any point on the curve segment is less than 0; Acquiring electrical parameters of the first power supply and the second power supply; When the voltage value of the second power supply is not less than a preset starting voltage value Vset, by adjusting the electrical parameters of the second power supply, the value of the external load equivalent resistance of the photoelectric conversion module is controlled to be not less than the current value of the internal impedance of the photoelectric conversion module, thereby maintaining the output power of the photoelectric conversion module within a specific stable region between the maximum power point and the low-resistance state; wherein the starting voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

[0014] According to the third aspect, an embodiment provides a computer-readable storage medium, on which a computer program is stored. The computer program can be executed by a processor to implement the optical fiber energy supply method as described in the second aspect.

[0015] According to a fourth aspect, an embodiment provides a light energy conversion power supply, comprising a photoelectric conversion module, a remote power conversion module, a power supply monitoring module, and a light energy transmission control module; The photoelectric conversion module is used to receive the laser transmitted by the optical fiber through the photoelectric converter and convert the light energy into electrical energy to obtain the first power supply; The remote power conversion module is used to convert the first power supply into a second power supply according to a preset power supply parameter, and use the second power supply as the working power supply output by the light energy conversion power supply; The power supply monitoring module is used to monitor the electrical parameters of the first power supply and the second power supply and send them to the optical energy transmission control module; the electrical parameters of the first power supply monitored by the power supply monitoring module include the operating current I1 and the operating voltage V1 of the first power supply; The optical energy transmission control module is used to control the output power of the photoelectric conversion module to maintain within the maximum power point and the specific stable region of the low-resistance state by adjusting the electrical parameters of the second power supply when the operating voltage V1 of the first power supply is not less than the starting voltage value Vset. The specific stable region of the low-resistance state is a curve segment on the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the tangent slope of the point on the power-voltage curve corresponding to any point on the curve segment is less than 0; wherein, the starting voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

[0016] According to the optical fiber energy supply system of the above embodiment, since the output power of the photoelectric conversion module is set by a dual closed-loop control method, the energy loss of photoelectric conversion is reduced, the actual operating temperature is lowered, and the reliability of the photoelectric conversion module is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural functional block diagram of an optical fiber energy supply system in one embodiment; Figure 2 is a characteristic curve of electric energy output of a photoelectric conversion module in one embodiment; Figure 3 A schematic flow chart of an optical fiber energy supply method according to an embodiment; Figure 4 This is a functional structure diagram of an optical fiber energy supply system in another embodiment; Figure 5 A simplified output model diagram of a photoelectric conversion module in one embodiment; Figure 6 This is a flow chart of a method for adjusting the external load equivalent resistance of a photoelectric conversion module in one embodiment; Figure 7 A schematic diagram of a circuit connection of a Buck converter in one embodiment; Figure 8 A schematic diagram of a circuit connection of a Buck-Boost converter in one embodiment; Figure 9 A schematic flow chart of an optical fiber energy supply method according to another embodiment; Figure 10 FIG. 1 is a functional structural block diagram of a light energy conversion power supply in an embodiment. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions, and for those skilled in the art, it is not necessary to describe these related operations in detail. They will fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0019] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0020] Component numbers used herein, such as "first" and "second," are used solely to distinguish the components being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0021] In the field of power supply technology for measuring instrumentation, if a fiber-optic power supply system is used to remotely power the instrument load, it must provide stable and reliable power output. However, the current closed-loop control method for fiber-optic power supply systems simply adjusts the output power of the transmitting laser based on the feedback signal from the measuring load end, and obtains the corresponding power supply through the photoelectric conversion module. This method has the following disadvantages: a low degree of automation (the output power of the light energy at the power supply end must be manually adjusted or set to a preset value), a single judgment condition (the output power of the light energy at the power supply end is adjusted based on the amplitude of the feedback load envelope signal), and poor adaptability to working environments (especially when the internal resistance of the photoelectric conversion device increases due to aging or harsh line environment when the laser is operating at high power output. The only way to adjust the output power of the transmitting laser is to detect the amplitude change of the modulation signal output by the photoelectric conversion module).

[0022] Please refer to Figure 2, is an electric energy output characteristic curve of the photoelectric conversion module in an embodiment, including an I axis (current axis), a U axis (voltage axis), a P axis (power axis) and an output characteristic curve, and the output characteristic curve includes an IV curve (current-voltage corresponding curve) and a PV curve (power-voltage corresponding curve). When the laser power input (light energy transmitted by optical fiber) and the working environment (temperature, etc.) are stable, the intersection of the IV curve of the photoelectric conversion module with the current axis (I axis) is the short-circuit current Isc, and the intersection with the voltage axis (U axis) is the open-circuit voltage Voc. The IV curve has a unique maximum power point (MPP), which is point A. Its corresponding I-axis and U-axis coordinate points are Im and Vm, that is, the current and voltage values ​​corresponding to the maximum power point. If the photoelectric conversion module 4 is not working at point A, there are two working points with the same power Pc, one on the left and one on the right side of point A (for example Figure 2 The photoelectric conversion module can be considered as a nonlinear DC power supply, which has a low internal resistance in the higher voltage region, such as the location of point B, and a high internal resistance in the lower voltage region, such as the location of point C.

[0023] As can be seen from the curve, the photovoltaic converter module's volt-ampere characteristics vary significantly near point C, resulting in sensitive internal impedance. Small changes in load current can cause large voltage fluctuations, negatively impacting overall system stability. When the tangent slope (ΔP / ΔV) at any point on the PV curve is greater than 0, the internal impedance is high in the region near point C (e.g., between points C and A), resulting in a high internal resistance characteristic and relatively high power loss. When operating near point B (e.g., between points A and B), the IV curve is flat, internal resistance changes minimal, and the tangent slope (ΔP / ΔV) at any point on the PV curve is less than 0, indicating optimal system stability. When operating at its maximum power point (MPP) at point A, the photovoltaic converter achieves maximum output efficiency and minimizes internal resistance. The tangent slope (ΔP / ΔV) at the MPP on the PV curve is 0.

[0024] The current closed-loop control system for fiber-optic power supply systems simply adjusts the laser output power based on the feedback signal measured at the load end, obtaining the corresponding electrical energy supply through the photoelectric conversion module. However, this simple adjustment method does not take into account the nonlinear output characteristics of the photoelectric conversion device. As the photoelectric conversion device of the fiber-optic power supply device ages or the power dissipation at the load end changes, simply adjusting the output power of the transmitting laser in steps based on the feedback voltage signal or the load power envelope signal may cause the photoelectric conversion module to fall into the area where point C is located, resulting in instability in the adjustment system. In addition, when the laser is operating at high power output, aging will cause the internal resistance of the photoelectric conversion device to increase. Coupled with the modulation signal at the laser driver end of the power supply end, by detecting the amplitude change of the modulation signal output by the photoelectric conversion module, the power output of the transmitting laser must be adjusted. This obviously increases the circuit cost of the power supply end.

[0025] In one embodiment of the present application, the output voltage of the photoelectric conversion module is detected in real time, and the output current of the laser is dynamically adjusted to ensure stable operation of the load circuit of the optical fiber power supply device.

[0026] In one embodiment of the present application, the deviation between the dynamic internal resistance of the photoelectric conversion module and the equivalent load impedance is dynamically detected by a pressure-current detection device, and the external matching is adjusted through real-time control so that the output power of the photoelectric conversion module operates stably near the maximum power point, ensuring that the photoelectric conversion module provides energy to the load as much as possible, further reducing energy dissipation in the photoelectric converter, and improving the conversion efficiency and reliability of the photoelectric converter.

[0027] In an embodiment of the present application, based on the characteristic that the PV curve output by the photoelectric conversion module can be continuously differentiated, the MPP point of the photoelectric conversion module and the stable working area of ​​the low-resistance system are divided by the conductance coefficient, and the equivalent conductance coefficient of the output load is adjusted in real time. According to the preset target coefficient, the output power of the photoelectric conversion module can flexibly operate at the MPP point or stably operate in the preset stable area of ​​low resistance of the photoelectric conversion module, thereby reducing the energy loss of the optical fiber power supply system. Not only does the energy conversion efficiency of the optical fiber power supply system improve, but the optical fiber power supply system can also be applied to measuring instruments and equipment.

[0028] Example 1: like Figure 1As shown, the present application discloses an optical fiber power supply system for measuring instruments, including a power-consuming end 200, which receives light energy through an optical fiber and converts the received light energy into electrical energy to provide a working power supply for a load 6. The power-consuming end 200 includes a photoelectric conversion module 4, a remote power conversion module 5, a power supply monitoring module 7, and a light energy transmission control module 8. The photoelectric conversion module 4 is used to receive a laser transmitted by an optical fiber through a photoelectric converter and convert the light energy into electrical energy to obtain a first power supply. The remote power conversion module 5 is used to convert the first power supply into a second power supply according to a preset power supply parameter, and use the second power supply as the working power supply for the load 6. The power supply monitoring module 7 is used to monitor the electrical parameters of the first power supply and the second power supply, and send them to the light energy transmission control module 8. The optical energy transmission control module 8 is used to obtain the power adjustment parameters of the laser received by the photoelectric conversion module 4 based on the electrical parameters of the first power supply, and send the power adjustment parameters to the power supply end 100 of the optical fiber power supply system to adjust the optical energy power of the laser transmitted by the optical fiber so that the output voltage value of the first power supply is not less than a preset starting voltage value Vset, wherein the starting voltage value Vset is the minimum voltage value of the second power supply output by the preset remote power conversion module 5. The optical energy transmission control module 8 is also used to control the output power of the photoelectric conversion module 4 to be maintained within the maximum power point and the low-resistance state specific stable region by adjusting the electrical parameters of the second power supply when the output voltage value of the second power supply is not less than the starting voltage value Vset. The low-resistance state specific stable region is a curve segment on the current-voltage curve in the power conversion parameters of the photoelectric conversion module. The tangent slope of the point on the power-voltage curve corresponding to any point on the curve segment is less than 0, see Figure 2 The curve segment from point A to point B on the IV curve (current-voltage curve) is shown in FIG. The power supply monitoring module 7 monitors the electrical parameters of the first power supply, including the operating current I1 and the operating voltage V1 of the first power supply, and the electrical parameters of the second power supply, including the operating voltage V2 of the second power supply.

[0029] In one embodiment, the optical energy transmission control module 8 is further configured to output an internal resistance adjustment signal to the remote power conversion module 5. The remote power conversion module 5 is configured to set the electrical parameters of the second power supply based on the internal resistance adjustment signal to modify the external load equivalent resistance relative to the power output of the photoelectric conversion module 4. When the operating voltage V2 of the second power supply is not less than the starting voltage value Vset, the optical energy transmission control module 8 is configured to control the external load equivalent resistance of the photoelectric conversion module 4 to a value not less than the current internal impedance of the photoelectric conversion module 4 using the internal resistance adjustment signal, thereby maintaining the output power of the photoelectric conversion module within the maximum power point (MPP) and a specific low-resistance stable region.

[0030] In one embodiment, when the operating voltage V2 of the second power supply is less than the starting voltage value Vset, the optical energy transmission control module 8 is used to send a power adjustment parameter to the power supply end 100 of the optical fiber power supply system, so that the power supply end 100 can increase the optical energy power of the laser transmitted by the optical fiber according to the power adjustment parameter.

[0031] Please refer to Figure 3 , is a flow chart of an optical fiber energy supply method in one embodiment. In one embodiment of the present application, a method for supplying optical fiber energy to a measuring instrument is also disclosed, which is applied to the optical fiber energy supply system as described above. The optical fiber energy supply method includes: Step 101: Obtain power conversion parameters.

[0032] Obtain the current-voltage curve and power-voltage curve of the power conversion parameters of the photoelectric conversion module.

[0033] Step 102: Obtain the maximum power point.

[0034] The maximum power point and the low-resistance state specific stable region are obtained based on the current-voltage curve and the power-voltage curve. The low-resistance state specific stable region is a curve segment on the current-voltage curve of the power conversion parameter of the photoelectric conversion module, where the tangent slope of the point on the power-voltage curve corresponding to any point on the curve segment is less than 0.

[0035] Step 103: Acquire electrical parameters.

[0036] Electrical parameters of the first power supply and the second power supply are obtained.

[0037] Step 104: Adjust the equivalent resistance.

[0038] When the voltage value of the second power supply is not less than a preset starting voltage value Vset, by adjusting the electrical parameters of the second power supply, the value of the external load equivalent resistance of the photoelectric conversion module is controlled to be not less than the value of the current internal impedance of the photoelectric conversion module, thereby maintaining the output power of the photoelectric conversion module within a specific stable region between the maximum power point and the low-resistance state, wherein the starting voltage value Vset is the minimum voltage value of the second power supply output by the preset remote power conversion module.

[0039] To facilitate understanding of the application of the optical fiber energy supply method disclosed in the embodiments of the present application, a specific embodiment is described below, specifically including: Please refer to Figure 4, is a functional block diagram of the optical fiber energy supply system in another embodiment. The optical energy transmission control module 8 at the power consumption end includes an MCU microcontroller U1, the power supply monitoring module 7 includes a current detection circuit U2 and a voltage detection circuit U3, the internal resistance adjustment signal output by the optical energy transmission control module 8 to the remote power conversion module 5 is a multi-channel output voltage signal or a PWM control signal, the power supply module 1 at the power supply end is an adjustable current source S1, the photoelectric conversion module 2 is a laser D2, and the current source S2 and the internal resistor Ri form an ideal model of the photoelectric conversion module 4. The remote power conversion module 5 is a simplified model of a DC-DC boost switching power supply circuit. The remote power conversion module 5 is used to convert the first power supply into the second power supply. It includes a controlled switch tube Q1, a unidirectional conduction tube D1, a first capacitor C1, a second capacitor C2, and a first inductor L1. The controlled switch tube Q1 is a MOS switch tube, the unidirectional conduction tube D1 is a freewheeling diode, and the internal resistance adjustment signal is a pulse signal with adjustable pulse width (PWM control signal). The controlled switch tube Q1 is controlled to turn on or off by the PWM signal output by the light energy transmission control module 8. The load is represented by the symbol of the circuit impedance, and the voltage signal across it is the second power supply ( Figure 4 The voltage value Vo of the second power supply is the working voltage V2 output by the second power supply. Figure 4 The internal output voltage Vs of the current source S2 is represented by , the output voltage V1 of the photoelectric conversion module 4 is represented by , and the output current I1 of the photoelectric conversion module 4 is represented by , namely the output voltage V1 and output current I1 of the first power supply. Figure 4 The workflow of the fiber optic energy supply system shown includes: 1. System startup process.

[0040] The MCU microcontroller U1 controls the adjustable current source S1 to output the driving current Id1 based on the preset value of the laser driving current (this preset value can drive the laser to emit light, and use the energy output by the photoelectric conversion module 4 at the electrical end to drive the electrical end control circuit and the voltage-current detection circuit to work normally, and feed back the voltage-current detection signal), and drives the laser D2 to emit light according to the control signal Vctr1 of the adjustable current source control signal Vctr1. In this embodiment, a PWM (Pulse Width Modulation) or pulse density modulation (Pulse Density Modulation) signal or an output voltage signal is used as the control signal according to the control demand of the adjustable current source control signal Vctr1.

[0041] 2. Monitor the circuit startup process.

[0042] The optical signal output by laser D2 is transmitted via optical fiber to photoelectric conversion module 4, which converts the optical signal into an electrical signal. Current source S2 then outputs voltage V1 and current I1 to remote power conversion module 5. Current detection circuit U2 and voltage detection circuit U3, respectively, feed the detected operating current I1 and voltage V1 values ​​back to MCU microcontroller U1.

[0043] 3. Laser power adjustment process.

[0044] MCU microcontroller U1 analyzes data and sets a startup voltage value Vset. (The components of power-consuming load 6 typically have a minimum startup voltage requirement, i.e., a preset startup voltage value Vset that is higher than the minimum operating voltage of the power-consuming components.) When the voltage V1 of the first power supply output by photoelectric conversion module 4 is lower than the set startup voltage value Vset, current source S1 at the power supply end is controlled to gradually increase the output of the first drive current Id1, driving laser D2 to increase its luminous power until the voltage V1 output by photoelectric conversion module 4 exceeds the startup voltage value Vset.

[0045] 4. Maximum output power adjustment process.

[0046] When the voltage V1 at the operating point of photoelectric conversion module 4 is greater than the set starting voltage value Vset, the duty cycle of the internal resistance adjustment signal (using a PWM signal as an example) output to the remote power conversion module 5 is adjusted via control signal Vctr2. This changes the external load equivalent resistance of photoelectric conversion module 4 to match the current internal impedance of photoelectric conversion module 4, making the external load equivalent resistance equal to the internal impedance of the photoelectric conversion module. According to the maximum power transfer theorem, also known as Jacobi's law, the output power of photoelectric conversion module 4 now operates stably at the maximum power point. When the incident laser power is constant, the maximum output power of photoelectric conversion module 4 leads to the highest photoelectric conversion efficiency and the lowest heat dissipation in photoelectric conversion module 4.

[0047] 5. Continuous adjustment process.

[0048] As ambient temperature slowly changes or components age, the conversion efficiency of the transmitting laser and photoelectric conversion module 4 decreases, causing the operating voltage V1 at the operating point to fall below Vset. This requires re-starting the system. In this case, the threshold Vset needs to be lowered. To ensure system stability during project implementation, a hysteresis interval б (adjustable preset value) is designed. This means that the system startup process is not restarted until the operating voltage V1 at the operating point falls below Vset – б.

[0049] The optimization adjustment principle and process during the maximum output power adjustment process are described as follows: like Figure 2As shown in the figure, under stable laser power input and temperature conditions, the intersection of the output characteristic curve of the photoelectric conversion module with the current axis is the short-circuit current Isc, and the intersection with the voltage axis is the open-circuit voltage Voc. The curve has a single maximum power point (MPP), and the voltage and current corresponding to this point are Vm and Im, respectively. It can be seen that the photoelectric conversion module can be considered a nonlinear DC power supply, with low internal resistance in the higher voltage region and high internal resistance in the lower voltage region. It is equivalent to a voltage source when operating in the high voltage region and a current source when operating in the low voltage region.

[0050] Please refer to Figure 5 Figure 1 shows a simplified output model of a photoelectric conversion module in one embodiment, including the external load equivalent resistance Req and internal impedance Ri of the photoelectric conversion module. According to the maximum power transfer theorem, also known as Jacobi's law, the source network outputs maximum power when the load network equivalent resistance equals the source network internal resistance. Any power supply network can be simplified to consist of a power supply and a load. If the internal impedance equals the load input impedance, the power supply can achieve maximum power output.

[0051] Since the output characteristics of the photoelectric conversion module, a semiconductor device with nonlinear internal resistance characteristics, are special, its volt-ampere characteristic curve decreases monotonically. Figure 2 It can be seen from the output characteristic curve of the photoelectric conversion module that the dynamic impedance of the photoelectric conversion module at the MPP point is equal to the negative of the derivative of the voltage with respect to the current at that point. If we define the negative of the derivative of the voltage with respect to the current as the dynamic equivalent internal impedance, then the above maximum power output theory is established, specifically including: ; The equivalent input impedance of the photoelectric conversion module is defined as: R eq =V1÷I1; Therefore, in a nonlinear system with a first-order monotonic internal impedance characteristic, the maximum power can be obtained when the equivalent impedance is matched, which can be expressed as the following formula: R i =R eq ; Define the dynamic equivalent impedance deviation ε, and the formula for obtaining the dynamic equivalent impedance deviation ε is: ε=R eq - R i ; Therefore, the output voltage and output current of the photoelectric converter can be dynamically adjusted to make the impedance deviation ε zero.

[0052] Ideally, ignore Figure 4The first inductor L1, freewheeling diode D1 and other components in the mid-to-remote power conversion module 5 and the voltage detection circuit and current detection circuit in the power supply monitoring module 7 have a small energy loss, and the output power consumption of the photoelectric conversion module 4 is all loaded to the load 6, which can be obtained: V1×I1=Vo 2 ÷R load ; Vo÷V1=1 / (1-D); Among them, R load is the load equivalent resistance, V1 is the output voltage of the photoelectric conversion module, I1 is the output current of the photoelectric conversion module, and D represents the duty cycle of the controlled switch Q1. Combining the above two formulas, the external equivalent impedance of the photoelectric conversion module can be obtained as follows: R eq =(1-D) 2 ×R load ; As can be seen from the above formula, the external equivalent impedance Req of the photoelectric conversion module can be changed by adjusting the duty cycle D of the PWM control signal of the remote power conversion module 5. Substituting the dynamic equivalent impedance deviation ε into the above formula, we get: ε=(1-D) 2 ×R load - R i ; That is, the duty cycle D of the PWM control signal input to the remote power conversion module 5 can be adjusted so that the impedance deviation ε is zero and the source network outputs maximum power when the equivalent resistance of the load network is equal to the internal resistance of the source network.

[0053] Please refer to Figure 6 , which is a flow chart of a method for adjusting the external load equivalent resistance of a photoelectric conversion module in one embodiment. The following discloses a method for adjusting the external load equivalent resistance of a photoelectric conversion module based on the dynamic equivalent impedance deviation ε defined in the embodiments of this application, specifically including: Step 201: Obtain a preset voltage value.

[0054] The starting voltage value Vset is preset or the starting voltage value Vset is changed.

[0055] Step 202: Obtain electrical parameters of a first power supply.

[0056] The real-time operating voltage V1 and operating current I1 of the first power supply are obtained.

[0057] Step 203: Determine the magnitude relationship between V1 and Vset.

[0058] When the operating voltage V1 is less than the starting voltage value Vset, step 204 is executed.

[0059] When the operating voltage V1 is not less than the starting voltage value Vset, step 205 is executed.

[0060] Step 204: Increase the laser power.

[0061] When the voltage V1 of the first power supply output by photoelectric conversion module 4 is less than the set starting voltage Vset, current source S1 at the power supply terminal is controlled to gradually increase the output of the first drive current Id1, driving laser D2 to increase the luminous power until the voltage V1 output by photoelectric conversion module 4 exceeds the starting voltage Vset. Steps 201, 202, 203, and 204 form a first closed control loop.

[0062] Step 205: Calculate the internal resistance and the equivalent external resistance.

[0063] Calculate the internal resistance based on the operating voltage V1 and the operating current I1. Calculate the equivalent resistance of the external load using the formula for calculating the external equivalent impedance.

[0064] Step 206, calculate ε.

[0065] The impedance deviation ε is obtained by applying the formula for obtaining the dynamic equivalent impedance deviation ε. When the value of the impedance deviation ε is 0, step 207 is executed. When the value of the impedance deviation ε is not 0, step 208 is executed.

[0066] Step 207: Adjust the duty cycle D.

[0067] The duty cycle of the internal resistance adjustment signal (taking a PWM signal as an example) output to the remote power conversion module 5 is adjusted by the control signal Vctr2, thereby changing the external load equivalent resistance of the photoelectric conversion module 4 to match the current internal impedance of the photoelectric conversion module 4.

[0068] Step 208, end the adjustment.

[0069] Because the impedance deviation ε is 0, the external load equivalent resistance of the photoelectric conversion module matches the internal impedance of the current photoelectric conversion module. That is, the external load equivalent resistance is equal to the internal impedance of the photoelectric conversion module. At this point, the output power of the photoelectric conversion module is stable and operates at the maximum power point. Under the condition of a constant incident laser power, the output power of the photoelectric conversion module is the highest, which leads to the highest photoelectric conversion efficiency and the lowest heat dissipation in the photoelectric conversion module.

[0070] It should be emphasized in this embodiment that the judgment condition for executing step 207 or step 208 in step 206 is whether the value of the impedance deviation ε is 0 (that is, the external load equivalent resistance Req is equal to the internal impedance Ri). However, in actual applications, it is relatively difficult to ensure that the output power of the photoelectric conversion module operates stably at the maximum power point. In one embodiment of the present application, the judgment condition for executing step 207 or step 208 in step 206 is whether the value of the impedance deviation ε is greater than a preset low-resistance state setting value a. The low-resistance state setting value is a positive number greater than 0, which is equivalent to limiting the execution of step 207 when the external load equivalent resistance Req is greater than the internal impedance Ri (that is, controlling the output power of the photoelectric conversion module to maintain in a specific stable region of the low-resistance state), and executing step 208 otherwise. In one embodiment, the determination condition of the impedance deviation ε is set to a value range of [0, β), where the value of β is a positive number greater than 0. When the value of the impedance deviation ε is between [0, β), step 208 is executed, otherwise step 207 is executed, which is equivalent to controlling the output power of the photoelectric conversion module to maintain it within the maximum power point and a specific stable region of the low-resistance state (for example, Figure 2 between point A and point B as shown), thereby ensuring that the output power of the photoelectric conversion module does not enter the high-impedance state region.

[0071] like Figure 1 As shown, in one embodiment, the optical energy transmission control module 8 and the electro-optical conversion control module 3 are two different controllers, and the communication between the two controllers can be achieved through optical fiber transmission or through a transmission interface with electrical isolation characteristics such as wireless WIFI, Bluetooth, ZigBee, etc.

[0072] like Figure 4As shown, in one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting a first power source, and the remote power conversion module includes a Boost converter for converting the first power source into a second power source. The Boost converter includes a controlled switch Q1, a unidirectional conduction transistor D1, a first capacitor C1, a second capacitor C2, and a first inductor L1. The controlled switch Q1 includes a positive connection terminal, a negative connection terminal, and a controlled signal input terminal. The controlled signal input terminal is used to input an internal resistance adjustment signal. The negative connection terminal of the controlled switch Q1 is connected to the negative output terminal of the photoelectric conversion module and serves as the negative output terminal of the second power source. The controlled switch Q1 connects or disconnects the positive and negative connection terminals based on the internal resistance adjustment signal. One end of the first inductor L1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the positive connection terminal of the controlled switch Q1. One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module. The positive terminal of the unidirectional conduction transistor D1 is connected to the positive terminal of the controlled switch transistor Q1, and the negative terminal of the unidirectional conduction transistor D1 is connected to the load, thereby serving as the positive output terminal of the second power supply. One end of the second capacitor C2 is connected to the negative terminal of the unidirectional conduction transistor D1, and the other end is connected to the negative terminal of the controlled switch transistor Q1.

[0073] In such Figure 4 In the photoelectric conversion module shown, when the controlled switch Q1 is turned on within the Ton time, the freewheeling diode (one-way conducting diode) D1 is turned off, the first power supply charges the second capacitor C2 and the first inductor L1, and the second capacitor C2 provides power to the load. At this time, the inductor current increases rapidly. The increment of the inductor current is: ; When the controlled switch Q1 is turned off within the Toff time, the freewheeling diode D1 is turned on, and the energy stored in the power supply and the inductor simultaneously supplies power to the second capacitor C2 and the load, and the inductor current decreases linearly. The absolute value of the reduction in the inductor current is: ; When this circuit operates in steady state, the increase in the inductor current is equal to the decrease in the inductor current. The relationship between the output voltage and input voltage of the second power supply is: Vo÷V1=1 / (1-D); Wherein, D is the duty cycle of the Vctr2 (PWM) signal, and in one embodiment, the value is between 0 and 1 to meet the application scenario of boost regulation.

[0074] Please refer to Figure 7, is a circuit connection diagram of a Buck converter in one embodiment. In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting a first power source, and the remote power conversion module includes a Buck converter for converting the first power source into a second power source. The Buck converter includes a controlled switch Q1, a unidirectional conduction transistor D1, a first capacitor C1, a second capacitor C2, and a first inductor L1. The controlled switch Q1 includes a positive connection terminal, a negative connection terminal, and a controlled signal input terminal. The controlled signal input terminal is used to input an internal resistance adjustment signal. The controlled switch Q1 connects or disconnects the positive and negative connection terminals based on the internal resistance adjustment signal. One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module. The positive connection terminal of the controlled switch Q1 is connected to the positive output terminal of the photoelectric conversion module, and the negative connection terminal of the controlled switch Q1 is connected to the negative connection terminal of the unidirectional conduction transistor D1. The positive terminal of the unidirectional conduction transistor D1 is connected to the negative output terminal of the photoelectric conversion module and serves as the negative output terminal of the second power supply. One end of the first inductor L1 is connected to the negative terminal of the unidirectional conduction transistor D1, and the other end serves as the positive output terminal of the second power supply. One end of the second capacitor C2 is connected to the positive output terminal of the second power supply, and the other end is connected to the positive terminal of the unidirectional conduction transistor D1.

[0075] In such Figure 7 In the photoelectric conversion module shown, when the controlled switch Q1 is turned on during the Ton time, the freewheeling diode (unidirectional conduction diode) D1 is in the off state. The voltage V1 of the first power supply, the first inductor L1, the second capacitor C2, and the load equivalent resistance Rload form a loop. During this period, the inductor current increases to store energy, and the voltage V1 of the first power supply supplies power to the load. When the controlled switch Q1 is turned off during the Toff time, the freewheeling diode D1 is turned on due to the inductor discharge. At this time, the first inductor L1, the second capacitor C2, and the load equivalent resistance Rload form a loop, and the first inductor L1 becomes the one supplying power to the load. The energy stored and released by the first inductor L1 during a period T is the same, so the average value of the voltage across the load is: Vo=T on ÷(T on +T off )×V1=T on ÷T×V1= D×V1; Wherein, D is the duty cycle of the Vctr2 (PWM) signal, and in one embodiment, the value is between 0 and 1 to meet the application scenario of voltage reduction regulation.

[0076] Please refer to Figure 8, is a circuit connection diagram of a Buck-Boost converter in one embodiment. In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting a first power source. The remote power conversion module includes a Buck-Boost converter for converting the first power source into a second power source. The Buck-Boost converter includes a controlled switch Q1, a unidirectional conduction transistor D1, a first capacitor C1, a second capacitor C2, and a first inductor L1. The controlled switch Q1 includes a positive connection terminal, a negative connection terminal, and a controlled signal input terminal. The controlled signal input terminal is used to input an internal resistance adjustment signal. The controlled switch Q1 connects or disconnects the positive and negative connection terminals based on the internal resistance adjustment signal. One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module. The positive connection terminal of the controlled switch Q1 is connected to the positive output terminal of the photoelectric conversion module, and the negative connection terminal of the controlled switch Q1 is connected to the negative connection terminal of the unidirectional conduction transistor D1. The positive terminal of the unidirectional conduction transistor D1 serves as the positive output terminal of the second power supply. One end of the first inductor L1 is connected to the negative terminal of the unidirectional conduction transistor D1, and the other end serves as the negative output terminal of the second power supply. One end of the second capacitor C2 is connected to the negative output terminal of the second power supply, and the other end is connected to the positive terminal of the unidirectional conduction transistor D1.

[0077] In one embodiment, the controlled switch Q1 is a MOS switch, the unidirectional conduction transistor D1 is a freewheeling diode, and the internal resistance adjustment signal is a pulse signal with an adjustable pulse width. In one embodiment, when the internal resistance adjustment signal is at a high level, the MOS switch is turned on to electrically connect the positive and negative terminals of the controlled switch Q1. When the internal resistance adjustment signal is at a low level, the MOS switch is turned off to disconnect the positive and negative terminals of the controlled switch Q1.

[0078] In such Figure 8 In the photoelectric conversion module shown, when the controlled switch Q1 is turned on during the Ton time, the freewheeling diode (unidirectional conduction diode) D1 is in the off state. The power supply charges the first inductor L1, which stores energy. At this time, the second capacitor C2 maintains a stable voltage and supplies power to the load. When the controlled switch Q1 is turned off during the Toff time, the freewheeling diode D1 is turned on. The energy-storing first inductor L1 now releases energy to supply power to the load, and the voltage at the load is in the opposite direction to that of the power supply. When the circuit is in a stable state, within a switching cycle T, the energy stored and released by the energy storage inductor are equal. Therefore, the average voltage across the equivalent resistance Rload of the load is: Vo=T on ÷(T on +T off )×V1=T on ÷T×V1= D×V1; Wherein, D is the duty cycle of the Vctr2 (PWM) signal. In one embodiment, when the value of D is between 0 and 0.5, the voltage value Vo ( Figure 8 The voltage value Vo of the second power supply (denoted as the operating voltage V2) is lower than the output voltage V1, exhibiting a buck characteristic. In one embodiment, when the value of D is between 0.5 and 1, the output voltage Vo is higher than the output voltage V1, exhibiting a boost characteristic. This allows for adaptation to both boost and buck scenarios.

[0079] The optical fiber energy supply method disclosed in one embodiment of the present application performs a dynamic and real-time double closed-loop control method on the optical fiber energy supply system, such as Figure 6 As shown, by real-time detection of the output voltage of the photoelectric conversion module, the output current of the laser is dynamically adjusted to ensure stable operation of the load circuit of the optical fiber energy supply device; the deviation between the dynamic internal resistance of the photoelectric conversion module and the equivalent load impedance is dynamically detected by the voltage-current detection device, and the external matching is adjusted through real-time control to make the output power of the photoelectric conversion module stably operate near the maximum power point, ensuring that the photoelectric conversion module can provide energy to the load as much as possible, further reducing energy dissipation in the photoelectric converter, and improving the conversion efficiency and reliability of the photoelectric converter.

[0080] The optical fiber energy supply system disclosed in the embodiment of the present application includes a power-consuming end, which includes a photoelectric conversion module, a remote power conversion module, a power supply monitoring module and a light energy transmission control module. The photoelectric conversion module is used to convert the optical energy input by the optical fiber into electrical energy to obtain a first power source, the remote power conversion module is used to convert the first power source into a second power source as a working power source for the load, the power supply monitoring module is used to monitor the electrical parameters of the first and second power sources, and the light energy transmission control module is used to control the output power of the photoelectric conversion module to maintain it within the maximum power point and the specific stable region of the low-resistance state by adjusting the electrical parameters of the second power source when the output of the second power source is not less than the starting voltage value. Since the output power of the photoelectric conversion module is set by a dual closed-loop control method, the energy loss of the photoelectric conversion is reduced, the actual working temperature is reduced, and the reliability of the photoelectric conversion module is improved.

[0081] Embodiment 2: In the first embodiment, the value of the external load equivalent resistance of the photoelectric conversion module is controlled by the internal resistance adjustment signal so that it is not less than the value of the current internal impedance of the photoelectric conversion module, so that the output power of the photoelectric conversion module is maintained within the maximum power point and the specific stable region of the low resistance state, for example Figure 6As shown, according to the impedance deviation ε (the difference between the external load equivalent resistance Req and the internal impedance Ri, when the impedance deviation ε is 0, the output power of the photoelectric conversion module is maintained at the maximum power point, and when the impedance deviation ε is greater than 0, the output power of the photoelectric conversion module is maintained in a specific stable region of the low-resistance state), the duty cycle of the internal resistance adjustment signal (PWM) is adjusted, and then the current value I1 and the voltage value V1 of the first power supply are adjusted to achieve the adjustment of the external load equivalent resistance Req.

[0082] This embodiment discloses a method for adjusting the equivalent conductance coefficient of a load in real time using a conductance method, so that the photoelectric conversion module operates in the ΔP / ΔV ≤ 0 region of the PV curve, that is, the output power of the photoelectric conversion module is maintained within a specific stable region between the maximum power point and the low-resistance state.

[0083] By comparing the conductance output by the photoelectric conversion module at a certain moment with the change in conductance, the position difference between the current operating point and the maximum power point (or the power point at a specific position) is determined. The result can be used to determine the direction of the next conductance change adjustment. The principles include: like Figure 2 As shown, the PV characteristic curve is continuously differentiable, and the maximum power point is the only maximum value point on the curve. According to the definition of derivative, when it is exactly at the maximum power point, its derivative value is 0, and its PV curve slope can satisfy the following formula: P = V × I; Taking the derivative of both sides of the above equation with respect to V, we can get: dP / dV=I+V×dI / dV; When the power point is at the maximum value on the curve and dP / dV=0, the maximum power value can be obtained: dI / dV=-(1÷V); When dI / dV>-(1÷V), the output voltage of the photoelectric conversion module is less than the MPP voltage, and at this moment it is on the rising curve to the left of the MPP point.

[0084] When dI / dV<-(1÷V), the output voltage of the photoelectric conversion module is greater than the MPP voltage, and at this moment it is on the descending curve to the right of the MPP point.

[0085] In such Figure 5 In the simplified model of the output of the photoelectric conversion module shown, the Figure 4 The first inductor L1, freewheeling diode D1 and other components in the mid-to-remote power conversion module 5 and the voltage detection circuit and current detection circuit in the power supply monitoring module 7 have a small energy loss, and the output power consumption of the photoelectric conversion module 4 is all loaded to the load 6, which can be obtained: V1×I1=V0 2 ÷R load ; V0÷V1=1÷(1-D); Among them, R load is the load equivalent resistance, V1 is the output voltage of the photoelectric conversion module, I1 is the output current of the photoelectric conversion module, and D represents the duty cycle of the controlled switch Q1. Combining the above two formulas, the formula for obtaining the external equivalent conductance value of the photoelectric conversion module can be obtained as follows: Geq=I1÷V1=1÷[(1-D) 2 ×R load ]; Among them, Geq is the external equivalent conductance of the photoelectric conversion module, and the D value can be changed by adjusting the duty cycle of the internal resistance control signal (PWM).

[0086] α=dI1 / dV1+I1 / V1; Where α is the conductance deviation of the incremental adjustment.

[0087] When α=0, the output voltage of the photoelectric conversion module is the voltage value of the MPP point.

[0088] When α>0, the output voltage of the photoelectric conversion module is less than the voltage value of the MPP point. Figure 2 The MPP point shown is on the left side of the rising curve.

[0089] When α<0, the output voltage of the photoelectric conversion module is greater than the voltage value of the MPP point. Figure 2 The MPP point shown is on the right side of the descending curve.

[0090] From the above content, it can be seen that the equivalent conductance value of the photoelectric conversion module can be changed by adjusting the duty cycle D of the internal resistance control signal (PWM). At the same time, it is determined whether the conductance deviation α is less than or equal to zero, so that the output power of the photoelectric conversion module is stably maintained within the maximum power point and the specific stable region of the low-resistance state.

[0091] Please refer to Figure 9 , which is a flow chart of another embodiment of an optical fiber energy supply method, wherein the duty cycle D is adjusted according to the conductance deviation α defined above to control the photoelectric conversion module to ultimately operate at the maximum power point MPP and a specific low-resistance stable region, specifically including: Step 301: Obtain preset parameters.

[0092] The starting voltage value Vset is preset or the starting voltage value Vset is changed.

[0093] Step 302: Obtain electrical parameters of a first power supply.

[0094] The real-time operating voltage V1 and operating current I1 of the first power supply are obtained.

[0095] Step 303: Calculate the Geq value.

[0096] Use the formulas dV = V1´ - V1, dI = I1´ - I1, and Geq = I1´ / V1´ to obtain the Geq value. Geq is the external equivalent conductance of the photoelectric conversion module.

[0097] Step 304: Obtain the α value.

[0098] Obtain the preset conductance deviation α or change the size of the conductance deviation α, and use the formula dI1 / dV1+I1 / V1 to calculate the actual conductance deviation α.

[0099] When the preset value of the preset conductance deviation α is 0 and the calculated conductance deviation α is also 0, step 307 is executed; otherwise, step 305 is executed.

[0100] Step 305: Determine the relationship between α and Geq.

[0101] When the left and right sides of the formula α=dI / dV+Geq are equal, step 310 is executed; otherwise, step 306 is executed.

[0102] Step 306: Adjust the duty cycle D.

[0103] The duty cycle of the internal resistance adjustment signal (taking a PWM signal as an example) output to the remote power conversion module 5 is adjusted by the control signal Vctr2, thereby changing the voltage V1 and the current I1 of the first current.

[0104] Step 307: Determine the dV value.

[0105] When the dV value is 0, step 309 is executed; otherwise, step 308 is executed.

[0106] Step 308: Determine the Geq value.

[0107] When the Geq value is equal to dI / dV, step 310 is executed; otherwise, step 306 is executed.

[0108] Step 309: Determine the dI value.

[0109] When the dI value is equal to 0, step 310 is executed; otherwise, step 306 is executed.

[0110] When α=0, the output voltage of the photoelectric conversion module is the voltage value of the MPP point. When α>0, the output voltage of the photoelectric conversion module is less than the voltage value of the MPP point. Figure 2 When α<0, the output voltage of the photoelectric conversion module is greater than the voltage value of the MPP point. Figure 2 The MPP point shown is on the right side of the descending curve.

[0111] In the aforementioned method of controlling the operation mode of the photoelectric conversion module by adjusting the duty cycle D based on the defined conductance deviation α, the output voltage and the equivalent conductance of the photoelectric module are changed by continuously changing the duty cycle D. The target conductance deviation α in the entire control process can be set dynamically. If the adjusted target conductance deviation α is equal to zero, the photoelectric conversion module ultimately operates at the maximum power point (MPP), achieving optimal output efficiency and ideal low internal resistance. However, as the load or photoelectric conversion device temperature changes or ages, adjustments become more frequent. Considering that the control process branches when both dI / dV and dV of the conductance method are equal to 0, if the adjusted target conductance deviation α is less than a specific value of zero, the output power of the photoelectric conversion module is stably operated in the specific low-resistance stable region of the photoelectric conversion module, and the output efficiency is relatively high (see [1]). Figure 2 The optical fiber power supply system is in a relatively stable state.

[0112] In this embodiment, the output voltage of the photoelectric conversion module (the electrical parameters of the first power supply) can also be monitored in real time to dynamically adjust the output current of the laser, ensuring stable operation of the load circuit of the optical fiber power supply device (ensuring that the voltage at the load end is no less than the starting voltage value Vset). Specifically, by dynamically monitoring the output voltage and current of the photoelectric conversion module using a voltage-current detection device and adjusting the external equivalent conductance in real time using the conductivity method, the optical fiber power supply system maintains a relatively stable state within the specific low-resistance stable region of the photoelectric conversion module. Furthermore, the deviation value of the target conductance can be dynamically set throughout the entire control process, allowing for flexible selection of the optimal output efficiency of the optical fiber power supply system's photoelectric conversion module, either at the MPP point or within the specific low-resistance stable region, thereby ensuring the stability of the entire power supply system.

[0113] Example 3: Please refer to Figure 10, is a functional block diagram of a light energy conversion power supply in an embodiment. The light energy conversion power supply 300 includes a photoelectric conversion module 4, a remote power conversion module 5, a power supply monitoring module 7, and a light energy transmission control module 8. The photoelectric conversion module 4 is used to receive laser light transmitted by an optical fiber through a photoelectric converter and convert the light energy into electrical energy to obtain a first power supply. The remote power conversion module 5 is used to convert the first power supply into a second power supply according to a preset power supply parameter, and use the second power supply as the working power supply output by the light energy conversion power supply. The power supply monitoring module 7 is used to monitor the electrical parameters of the first power supply and the second power supply, and send them to the light energy transmission control module 8. The electrical parameters of the first power supply monitored by the power supply monitoring module 7 include the working current I1 and the working voltage V1 of the first power supply. The optical energy transmission control module 8 is used to control the output power of the photoelectric conversion module 4 to be maintained within the maximum power point and the specific stable region of the low-resistance state by adjusting the electrical parameters of the second power supply when the operating voltage V1 of the first power supply is not less than the starting voltage value Vset. The specific stable region of the low-resistance state is a curve segment on the current-voltage curve of the power conversion parameters of the photoelectric conversion module, and the tangent slope of the point on the power-voltage curve corresponding to any point on the curve segment is less than 0. The starting voltage value Vset is the minimum voltage value of the second power supply output by the preset remote power conversion module.

[0114] In one embodiment, the power supply monitoring module 7 monitors the electrical parameters of the first power supply, including the operating current I1 and operating voltage V1 of the first power supply, and the electrical parameters of the second power supply, including the operating voltage V2 output by the second power supply. The optical energy transmission control module 8 is further configured to output an internal resistance adjustment signal to the remote power conversion module 5. The remote power conversion module 5 is configured to set the electrical parameters of the second power supply based on the internal resistance adjustment signal to change the external load equivalent resistance relative to the power output of the photoelectric conversion module 4. When the operating voltage V2 of the second power supply is not less than the starting voltage value Vset, the optical energy transmission control module 8 is configured to control the external load equivalent resistance of the photoelectric conversion module 4 to a value not less than the current internal impedance value of the photoelectric conversion module 4 via the internal resistance adjustment signal, thereby maintaining the output power of the photoelectric conversion module 4 within a specific stable region between the maximum power point and the low-resistance state.

[0115] In one embodiment, the remote power conversion module 5 includes a Boost converter, a Buck converter and / or a Buck-Boost converter. The respective circuit connection methods are as described in the Boost converter, Buck converter and Buck-Boost converter in Example 1 and are not repeated here.

[0116] In one embodiment, the internal resistance adjustment signal is a signal with an adjustable duty cycle. In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply. In one embodiment, the internal resistance adjustment signal is a PWM signal, a pulse density modulation signal, or a DC signal with a preset voltage amplitude. In one embodiment, the remote power conversion module 5 adjusts the electrical parameters of the second power supply in response to the internal resistance adjustment signal.

[0117] In one embodiment, the optical energy transmission control module adjusts the duty cycle of the internal resistance adjustment signal based on the conductance deviation value α and the external equivalent conductance Geq to control the electrical parameters of the second power supply, thereby maintaining the value of the external load equivalent resistance of the photoelectric conversion module no less than the current value of the internal impedance of the photoelectric conversion module, so that the output power of the photoelectric conversion module is maintained within the maximum power point and the specific low-resistance stable region. The method for adjusting the duty cycle of the internal resistance adjustment signal based on the conductance deviation value α and the external equivalent conductance Geq can be found in the second embodiment. Figure 9 The flow chart is shown in the figure. The formula for obtaining the conductance deviation value α and the external equivalent conductance Geq is: α=dI1 / dV1+I1÷V1; Geq=I1÷V1=1÷[(1-D) 2 ×R load ]; Among them, α is the conductance deviation value, V1 is the output voltage of the photoelectric conversion module, I1 is the output current of the photoelectric conversion module, dI1 / dV1 is the derivative of the output current of the photoelectric conversion module with respect to the voltage, Geq is the external equivalent conductance, R load is the load equivalent resistance, and D represents the duty cycle of the internal resistance adjustment signal.

[0118] In one embodiment, the optical energy transmission control module adjusts the duty cycle of the internal resistance adjustment signal based on the dynamic equivalent impedance deviation ε to control the electrical parameters of the second power supply, thereby maintaining the value of the external load equivalent resistance of the photoelectric conversion module no less than the current value of the internal impedance of the photoelectric conversion module, so that the output power of the photoelectric conversion module is maintained within the maximum power point and the specific low-resistance stable region. For the method of adjusting the duty cycle of the internal resistance adjustment signal based on the dynamic equivalent impedance deviation ε, see the description of the method described in the first embodiment. Figure 6 The formula for obtaining the dynamic equivalent impedance deviation ε is: ε=(1-D) 2 ×R load - R i ; Where ε is the dynamic equivalent impedance deviation, R load is the load equivalent resistance, D represents the duty cycle of the internal resistance adjustment signal, R i is the internal impedance of the photoelectric conversion module.

[0119] In one embodiment of the present application, an optical fiber power supply system is also disclosed, including the above-mentioned light energy conversion power supply. Figure 1 The functional block diagram shown in FIG. 1 shows that the light energy conversion power supply in this embodiment is Figure 1 The power consumption end.

[0120] In one embodiment of the present application, a fiber optic energy supply method is also disclosed, which is used in the fiber optic energy supply system as described above. Figure 3 As shown, the optical fiber energy supply method includes: Step 101: Obtain power conversion parameters.

[0121] Obtain the current-voltage curve and power-voltage curve of the power conversion parameters of the photoelectric conversion module.

[0122] Step 102: Obtain the maximum power point.

[0123] The maximum power point and the low-resistance state specific stable region are obtained based on the current-voltage curve and the power-voltage curve. The low-resistance state specific stable region is a curve segment on the current-voltage curve of the power conversion parameter of the photoelectric conversion module, where the tangent slope of the point on the power-voltage curve corresponding to any point on the curve segment is less than 0.

[0124] Step 103: Acquire electrical parameters.

[0125] Electrical parameters of the first power supply and the second power supply are obtained.

[0126] Step 104: Adjust the equivalent resistance.

[0127] When the voltage value of the second power supply is not less than a preset starting voltage value Vset, by adjusting the electrical parameters of the second power supply, the value of the external load equivalent resistance of the photoelectric conversion module is controlled to be not less than the value of the current internal impedance of the photoelectric conversion module, thereby maintaining the output power of the photoelectric conversion module within a specific stable region between the maximum power point and the low-resistance state, wherein the starting voltage value Vset is the minimum voltage value of the second power supply output by the preset remote power conversion module.

[0128] The light energy conversion power supply disclosed in the embodiments of the present application includes a photoelectric conversion module, a remote power conversion module, a power supply monitoring module, and a light energy transmission control module. The photoelectric conversion module is used to convert the light energy input by the optical fiber into electrical energy to obtain a first power supply, the remote power conversion module is used to convert the first power supply into a second power supply as a working power supply for an external load, the power supply monitoring module is used to monitor the electrical parameters of the first and second power supplies, and the light energy transmission control module is used to control the output power of the photoelectric conversion module to be maintained within the maximum power point and the specific stable region of the low-resistance state by adjusting the electrical parameters of the second power supply. Since the output power of the photoelectric conversion module is controlled to be maintained within the maximum power point or the specific stable region of the low-resistance state, the photoelectric conversion efficiency of the photoelectric conversion module is guaranteed, that is, the energy loss of the photoelectric conversion is reduced, and its actual operating temperature is reduced, thereby greatly improving the reliability of the light energy conversion power supply.

[0129] Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer program. When all or part of the functions in the above embodiments are implemented by computer program, the program can be stored in a computer-readable storage medium, and the storage medium can include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to implement the above functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the above functions can be implemented. In addition, when all or part of the functions in the above embodiments are implemented by computer program, the program can also be stored in a storage medium such as a server, another computer, disk, optical disk, flash disk or mobile hard disk, and saved in the memory of the local device by downloading or copying, or the system of the local device is updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be implemented.

[0130] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art can make several simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. An optical fiber energy supply system for a measuring instrument, characterized in that: It includes a power-consuming end, which receives light energy through optical fibers and converts the received light energy into electrical energy to provide working power for the load; The power consumption end includes a photoelectric conversion module, a remote power conversion module, a power supply monitoring module and a light energy transmission control module; The photoelectric conversion module is used to receive the laser transmitted by the optical fiber through the photoelectric converter and convert the light energy into electrical energy to obtain the first power supply; The remote power conversion module is used to convert the first power supply into a second power supply according to a preset power supply parameter, and use the second power supply as the working power supply of the load; The power supply monitoring module is used to monitor the electrical parameters of the first power supply and the second power supply, and send them to the optical energy transmission control module; The optical energy transmission control module is used to obtain power adjustment parameters of the laser received by the photoelectric conversion module based on the electrical parameters of the first power supply, and send the power adjustment parameters to the power supply end of the optical fiber energy supply system to adjust the optical energy power of the laser transmitted by the optical fiber so that the output voltage value of the first power supply is not less than a preset starting voltage value Vset; wherein the starting voltage value Vset is a preset minimum voltage value of the second power supply output by the remote power conversion module; The optical energy transmission control module is also used to control the output power of the photoelectric conversion module to maintain within the maximum power point and the specific stable region of the low-resistance state by adjusting the electrical parameters of the second power supply when the output voltage value of the second power supply is not less than the starting voltage value Vset. The specific stable region of the low-resistance state is a curve segment on the current-voltage curve of the power conversion parameters of the photoelectric conversion module, and the tangent slope of the point on the power-voltage curve corresponding to any point on the curve segment is less than 0.

2. The optical fiber energy supply system according to claim 1, wherein: The power supply monitoring module monitors the electrical parameters of the first power supply including the operating current I1 and the operating voltage V1 of the first power supply, and the electrical parameters of the second power supply including the operating voltage V2 of the second power supply; The optical energy transmission control module is further configured to output an internal resistance adjustment signal to the remote power conversion module, and the remote power conversion module is configured to set electrical parameters of the second power supply according to the internal resistance adjustment signal to change the equivalent resistance of the external load compared to the power output of the photoelectric conversion module; When the operating voltage V2 of the second power supply is not less than the starting voltage value Vset, the optical energy transmission control module is used to control the value of the external load equivalent resistance of the photoelectric conversion module to be not less than the current value of the internal impedance of the photoelectric conversion module through the internal resistance adjustment signal, so that the output power of the photoelectric conversion module is maintained within the specific stable region between the maximum power point and the low-resistance state.

3. The optical fiber energy supply system according to claim 2, wherein: When the operating voltage V2 of the second power supply is less than the starting voltage value Vset, the optical energy transmission control module is used to send the power adjustment parameter to the power supply end of the optical fiber power supply system, so that the power supply end can increase the optical energy power of the laser transmitted by the optical fiber according to the power adjustment parameter.

4. The optical fiber energy supply system according to claim 2, wherein: The photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply; The remote power conversion module includes a Boost converter for converting the first power supply into the second power supply; The Boost converter includes a controlled switch tube Q1, a unidirectional conducting tube D1, a first capacitor C1, a second capacitor C2 and a first inductor L1; The controlled switch tube Q1 includes a positive connection terminal, a negative connection terminal, and a controlled signal input terminal; the controlled signal input terminal is used to input the internal resistance adjustment signal; the negative connection terminal of the controlled switch tube Q1 is connected to the negative output terminal of the photoelectric conversion module and is used to serve as the negative output terminal of the second power supply; the controlled switch tube Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal; One end of the first inductor L1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the positive connection terminal of the controlled switch tube Q1; One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module; The positive connection end of the one-way conducting tube D1 is connected to the positive connection end of the controlled switch tube Q1, and the negative connection end of the one-way conducting tube D1 is connected to the load, so as to serve as the positive output end of the second power supply; One end of the second capacitor C2 is connected to the negative connection end of the unidirectional conducting tube D1 , and the other end is connected to the negative connection end of the controlled switch tube Q1 .

5. The optical fiber energy supply system according to claim 2, wherein: The photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply; The remote power conversion module includes a Buck converter for converting the first power supply into the second power supply; The Buck converter includes a controlled switch tube Q1, a unidirectional conducting tube D1, a first capacitor C1, a second capacitor C2 and a first inductor L1; The controlled switch tube Q1 includes a positive connection terminal, a negative connection terminal and a controlled signal input terminal; the controlled signal input terminal is used to input the internal resistance adjustment signal; the controlled switch tube Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal; One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module; The positive connection end of the controlled switch tube Q1 is connected to the positive output end of the photoelectric conversion module, and the negative connection end of the controlled switch tube Q1 is connected to the negative connection end of the unidirectional conduction tube D1; The positive electrode connection end of the one-way conducting tube D1 is connected to the negative output end of the photoelectric conversion module and is used as the negative output end of the second power supply; One end of the first inductor L1 is connected to the negative electrode connection end of the unidirectional conduction tube D1, and the other end is used as the positive output end of the second power supply; One end of the second capacitor C2 is connected to the positive output end of the second power supply, and the other end is connected to the positive electrode of the unidirectional conducting tube D1.

6. The optical fiber energy supply system according to claim 2, wherein: The photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply; The remote power conversion module includes a Buck-Boost converter for converting the first power supply into the second power supply; The Buck-Boost converter includes a controlled switch tube Q1, a unidirectional conducting tube D1, a first capacitor C1, a second capacitor C2 and a first inductor L1; The controlled switch tube Q1 includes a positive connection terminal, a negative connection terminal and a controlled signal input terminal; the controlled signal input terminal is used to input the internal resistance adjustment signal; the controlled switch tube Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal; One end of the first capacitor C1 is connected to the positive output terminal of the photoelectric conversion module, and the other end is connected to the negative output terminal of the photoelectric conversion module; The positive connection end of the controlled switch tube Q1 is connected to the positive output end of the photoelectric conversion module, and the negative connection end of the controlled switch tube Q1 is connected to the negative connection end of the unidirectional conduction tube D1; The positive electrode connection end of the one-way conducting tube D1 is used as the positive output end of the second power supply; One end of the first inductor L1 is connected to the negative electrode connection end of the unidirectional conducting tube D1, and the other end is used as the negative output end of the second power supply; One end of the second capacitor C2 is connected to the negative output end of the second power supply, and the other end is connected to the positive electrode of the unidirectional conducting tube D1.

7. The optical fiber energy supply system according to any one of claims 4 to 6, characterized in that: The controlled switch tube Q1 is a MOS switch tube; the unidirectional conduction tube D1 is a diode; the internal resistance adjustment signal is a pulse signal with adjustable pulse width; When the internal resistance adjustment signal is at a high level, the MOS switch tube is turned on to electrically connect the positive connection terminal and the negative connection terminal of the controlled switch tube Q1; When the internal resistance adjustment signal is at a low level, the MOS switch tube is turned off to disconnect the positive connection terminal and the negative connection terminal of the controlled switch tube Q1 .

8. A method for supplying energy to an optical fiber for a measuring instrument, characterized in that: For use in the optical fiber energy supply system according to any one of claims 1 to 7, the optical fiber energy supply method comprises: Obtaining a current-voltage curve and a power-voltage curve from power conversion parameters of the photoelectric conversion module; Obtaining a maximum power point and a low-resistance-state specific stable region based on the current-voltage curve and the power-voltage curve; wherein the low-resistance-state specific stable region is a curve segment on the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and a tangent slope of a point on the power-voltage curve corresponding to any point on the curve segment is less than 0; Acquiring electrical parameters of the first power supply and the second power supply; When the voltage value of the second power supply is not less than a preset starting voltage value Vset, by adjusting the electrical parameters of the second power supply, the value of the external load equivalent resistance of the photoelectric conversion module is controlled to be not less than the current value of the internal impedance of the photoelectric conversion module, thereby maintaining the output power of the photoelectric conversion module within a specific stable region between the maximum power point and the low-resistance state; wherein the starting voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

9. A computer-readable storage medium, characterized in that The medium stores a computer program, which can be executed by a processor to implement the optical fiber energy supply method according to claim 8.

10. A light energy conversion power supply, characterized in that: It includes photoelectric conversion module, remote power conversion module, power supply monitoring module and optical energy transmission control module; The photoelectric conversion module is used to receive the laser transmitted by the optical fiber through the photoelectric converter and convert the light energy into electrical energy to obtain the first power supply; The remote power conversion module is used to convert the first power supply into a second power supply according to a preset power supply parameter, and use the second power supply as the working power supply output by the light energy conversion power supply; The power supply monitoring module is used to monitor the electrical parameters of the first power supply and the second power supply and send them to the optical energy transmission control module; the electrical parameters of the first power supply monitored by the power supply monitoring module include the operating current I1 and the operating voltage V1 of the first power supply; The optical energy transmission control module is used to control the output power of the photoelectric conversion module to maintain within the maximum power point and the specific stable region of the low-resistance state by adjusting the electrical parameters of the second power supply when the operating voltage V1 of the first power supply is not less than the starting voltage value Vset. The specific stable region of the low-resistance state is a curve segment on the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the tangent slope of the point on the power-voltage curve corresponding to any point on the curve segment is less than 0; wherein, the starting voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

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