Fiber optic power supply system and method for measuring instruments, optical power conversion power supply

Abstract

A fiber optic power supply system and method for measuring instruments, and a light-power conversion power supply, are disclosed. The fiber optic power supply system includes a power-consuming end, which comprises a photoelectric conversion module, a remote power conversion module, a power supply monitoring module, and a light-power transmission control module. The photoelectric conversion module converts the light energy input from the fiber optic cable into electrical energy to obtain a first power source. The remote power conversion module converts the first power source into a second power source to serve as the operating power source for the load. The power supply monitoring module monitors the electrical parameters of the first and second power sources. The light-power transmission control module controls the output power of the photoelectric conversion module to maintain it within a specific stable region between the maximum power point and the low-resistance state by adjusting the electrical parameters of the second power source when its output is not less than the starting voltage value. By employing a dual closed-loop control method to set the output power of the photoelectric conversion module, energy loss during photoelectric conversion is reduced, its actual operating temperature is lowered, and thus the reliability of the photoelectric conversion module is improved.

Description

Technical Field

[0001] This application relates to the field of power supply technology for measuring instruments and equipment, specifically to an optical fiber power supply system and method for measuring instruments, and a light energy conversion power supply. Background Technology

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

[0003] Please refer to Figure 1 This is a structural functional block diagram of an optical fiber power supply system in one embodiment. The basic working principle of the optical fiber power supply system can be summarized as an "electric-optical-electric" conversion process, including 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 through optical fiber. The power supply end 100 includes a power module 1, an electro-optical conversion module 2, and an electro-optical conversion control module 3. The power module 1 is used to provide the operating power for the optical fiber power supply system, the electro-optical conversion module 2 is used to convert electrical energy into optical energy through a high-power laser source (semiconductor laser diode, LD), and the electro-optical conversion control module 3 is used to control the output power of the optical energy from the electro-optical conversion module 2. The power-consuming terminal 200 includes a photoelectric conversion module 4, a remote power conversion module 5, a load 6, 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 through optical fiber and convert light energy into electrical energy through a photoelectric converter (PPC). The remote power conversion module 5 is used to adjust the power supply parameters of the electrical energy obtained from the converted light 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 light energy transmission control module. The light 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 light 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), are non-conductive, and do not generate electrical sparks, they offer unparalleled safety in flammable and explosive environments (such as oil and gas, chemical, and coal mines) and high-voltage environments (such as power system monitoring). Furthermore, fiber optic transmission offers several advantages: no electromagnetic interference (fiber optic transmission is unaffected by electromagnetic interference and does not generate it, allowing for stable operation in strong electromagnetic environments); electrical isolation (perfectly achieving electrical isolation between remote equipment and the power supply, avoiding damage to equipment caused by ground loops, potential differences, lightning surges, etc.); long-distance transmission (fiber optics have extremely low loss, enabling energy transmission over kilometers, while copper cables suffer significant losses over long distances due to resistance); and lightweight and compact transmission lines (fiber optic cables are lighter and thinner than copper power cables of the same length). However, fiber optic power supply systems also have limitations such as low overall efficiency (although the photoelectric conversion efficiency itself is not low, after two conversions of "electricity -> light -> electricity", the overall system efficiency is usually much lower than that of direct power transmission), high cost (high-power lasers and special photoelectric converters (PPCs) are expensive components, resulting in a higher initial system cost than traditional power supply methods), power limitations (limited by laser power, fiber power carrying capacity and PPC conversion efficiency, the power that PoF systems can currently provide is usually in the watt range), and high difficulty in thermal management (high-power lasers and receiving PPCs generate heat during the conversion process), which greatly affect their application areas. Summary of the Invention

[0005] The main technical problem addressed by this invention is how to improve the reliability of fiber optic power supply systems.

[0006] According to the first aspect, one embodiment provides an optical fiber power supply system for measuring instruments, including a power-consuming end, which receives optical energy through an optical fiber and converts the received optical energy into electrical energy to provide working power for the load;

[0007] The power-consuming terminal includes a photoelectric conversion module, a remote power conversion module, a power supply monitoring module, and a light energy transmission control module;

[0008] The photoelectric conversion module is used to receive laser light transmitted through optical fiber via a photoelectric converter and convert the light energy into electrical energy to obtain a first power source;

[0009] The remote power conversion module is used to convert the first power source into a second power source according to a preset power supply parameter, and use the second power source as the working power source for the load.

[0010] 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.

[0011] The optical power transmission control module is used to obtain the 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 power supply system to adjust the optical 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 start-up voltage value Vset; wherein, the start-up voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

[0012] The optical power transmission control module is further configured to, when the output voltage of the second power supply is not less than the start-up voltage Vset, adjust the electrical parameters of the second power supply to control the output power of the photoelectric conversion module to be maintained within a specific stable region between the maximum power point and the low resistance state. The specific stable region of the low resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the slope of the tangent line at any point on the power-voltage curve corresponding to any point on this segment is less than 0.

[0013] In one embodiment, the power supply monitoring module 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 of the second power supply.

[0014] The optical power transmission control module is also used to output an internal resistance adjustment signal to the remote power conversion module. The remote power conversion module is used to set the electrical parameters of the second power supply according to the internal resistance adjustment signal, so as to change the equivalent resistance of the external load compared with the power output of the photoelectric conversion module.

[0015] When the operating voltage V2 of the second power supply is not less than the starting voltage value Vset, the optical power 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 value of the current 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 a specific stable region between the maximum power point and the low resistance state.

[0016] In one embodiment, when the operating voltage V2 of the second power supply is less than the start-up voltage value Vset, the optical power transmission control module is used to send the power adjustment parameters to the power supply end of the optical fiber power supply system, so that the power supply end can increase the optical power of the laser transmitted through the optical fiber according to the power adjustment parameters.

[0017] In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply;

[0018] The remote power conversion module includes a Boost converter for converting the first power supply into the second power supply;

[0019] The Boost converter includes a controlled switch Q1, a unidirectional transistor D1, a first capacitor C1, a second capacitor C2, and a first inductor L1;

[0020] 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 for inputting the 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 is used as the negative output terminal of the second power supply; the controlled switch Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal.

[0021] 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.

[0022] 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;

[0023] The positive terminal of the unidirectional conducting tube D1 is connected to the positive terminal of the controlled switching tube Q1, and the negative terminal of the unidirectional conducting tube D1 is connected to the load, so as to serve as the positive output terminal of the second power supply.

[0024] One end of the second capacitor C2 is connected to the negative terminal of the unidirectional conducting transistor D1, and the other end is connected to the negative terminal of the controlled switching transistor Q1.

[0025] In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply;

[0026] The remote power conversion module includes a Buck converter for converting the first power source into the second power source.

[0027] The Buck converter includes a controlled switch Q1, a unidirectional conductor D1, a first capacitor C1, a second capacitor C2, and a first inductor L1;

[0028] 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 for inputting the internal resistance adjustment signal; the controlled switch Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal;

[0029] 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;

[0030] 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 terminal of the unidirectional conduction tube D1.

[0031] The positive terminal of the unidirectional conduction tube D1 is connected to the negative output terminal of the photoelectric conversion module and is used as the negative output terminal of the second power supply.

[0032] One end of the first inductor L1 is connected to the negative terminal of the unidirectional conductive tube D1, and the other end is used as the positive output terminal of the second power supply.

[0033] 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 conducting tube D1.

[0034] In one embodiment, the photoelectric conversion module includes a positive output terminal and a negative output terminal for outputting the first power supply;

[0035] The remote power conversion module includes a Buck-Boost converter for converting the first power source into the second power source;

[0036] The Buck-Boost converter includes a controlled switch Q1, a unidirectional conductor D1, a first capacitor C1, a second capacitor C2, and a first inductor L1;

[0037] 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 for inputting the internal resistance adjustment signal; the controlled switch Q1 connects or disconnects the positive connection terminal and the negative connection terminal according to the internal resistance adjustment signal;

[0038] 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;

[0039] 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 terminal of the unidirectional conduction tube D1.

[0040] The positive terminal of the unidirectional conductive tube D1 is used as the positive output terminal of the second power supply.

[0041] One end of the first inductor L1 is connected to the negative terminal of the unidirectional conductive tube D1, and the other end is used as the negative output terminal of the second power supply.

[0042] 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 conducting tube D1.

[0043] In one embodiment, the controlled switch Q1 is a MOS switch; the unidirectional conduction transistor D1 is a diode; and the internal resistance adjustment signal is a pulse signal with adjustable pulse width.

[0044] When the internal resistance adjustment signal is high, the MOS switch is turned on to electrically connect the positive and negative terminals of the controlled switch Q1.

[0045] When the internal resistance adjustment signal is low, the MOS switch is turned off to disconnect the electrical connection between the positive and negative terminals of the controlled switch Q1.

[0046] According to a second aspect, one embodiment provides an optical fiber power supply method for a measuring instrument, applicable to an optical fiber power supply system as described in the first aspect, the optical fiber power supply method comprising:

[0047] Obtain the current-voltage curve and power-voltage curve from the power conversion parameters of the photoelectric conversion module;

[0048] The maximum power point and the specific stable region of low resistance state are obtained based on the current-voltage curve and the power-voltage curve; wherein, the specific stable region of low resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the slope of the tangent line of the point on the power-voltage curve corresponding to any point on the segment is less than 0.

[0049] Obtain the electrical parameters of the first power supply and the second power supply;

[0050] When the voltage value of the second power supply is not less than a preset start-up voltage value Vset, by adjusting the electrical parameters of the second power supply, the value of the equivalent resistance of the external load of the photoelectric conversion module is controlled to be not less than the value of the internal impedance of the current photoelectric conversion module, thereby making the output power of the photoelectric conversion module maintain within a specific stable region of maximum power point and low resistance state; wherein, the start-up voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

[0051] According to a third aspect, one embodiment provides a computer-readable storage medium storing a computer program that can be executed by a processor to implement the optical fiber power supply method as described in the second aspect.

[0052] According to the fourth aspect, one embodiment provides a light energy conversion power supply, including a photoelectric conversion module, a remote power conversion module, a power supply monitoring module, and a light energy transmission control module;

[0053] The photoelectric conversion module is used to receive laser light transmitted through optical fiber via a photoelectric converter and convert the light energy into electrical energy to obtain a first power source;

[0054] The remote power conversion module is used to convert the first power source into a second power source according to a preset power supply parameter, and use the second power source as the working power source output by the light energy conversion power source.

[0055] 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 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.

[0056] The optical power transmission control module is used to control the output power of the photoelectric conversion module to remain within a specific stable region between the maximum power point and the low resistance state by adjusting the electrical parameters of the second power source when the operating voltage V1 of the first power source is not less than the start-up voltage value Vset. The specific stable region of the low resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the slope of the tangent line at any point on the power-voltage curve corresponding to any point on this segment is less than 0. The start-up voltage value Vset is a preset minimum voltage value of the second power source output by the remote power conversion module.

[0057] According to the fiber optic power supply system of the above embodiment, the output power of the photoelectric conversion module is set by a dual closed-loop control method, which reduces the energy loss of photoelectric conversion, lowers its actual operating temperature, and thus improves the reliability of the photoelectric conversion module. Attached Figure Description

[0058] Figure 1 This is a structural functional block diagram of an optical fiber power supply system in one embodiment;

[0059] Figure 2 The image shows the power output characteristic curve of the photoelectric conversion module in one embodiment.

[0060] Figure 3 This is a flowchart illustrating one embodiment of an optical fiber power supply method;

[0061] Figure 4 This is a functional block diagram of the fiber optic power supply system in another embodiment;

[0062] Figure 5 This is a simplified schematic diagram of the output model of the photoelectric conversion module in one embodiment;

[0063] Figure 6 This is a flowchart illustrating a method for adjusting the equivalent resistance of the external load of a photoelectric conversion module in one embodiment.

[0064] Figure 7 This is a schematic diagram of the circuit connection of a Buck converter in one embodiment;

[0065] Figure 8 This is a schematic diagram of the circuit connection of a Buck-Boost converter in one embodiment;

[0066] Figure 9 This is a flowchart illustrating the fiber optic power supply method in another embodiment;

[0067] Figure 10 This is a functional block diagram of a light energy conversion power supply in one embodiment. Detailed Implementation

[0068] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0069] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0070] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0071] In the field of power supply technology for measuring instruments and equipment, if fiber optic power supply systems are used to remotely power the loads of measuring instruments, they need to provide a stable and reliable power output. However, current closed-loop control methods for fiber optic power supply systems simply adjust the output power of the transmitting laser based on the feedback signal from the load end, and obtain the corresponding electrical energy supply through the photoelectric conversion module. This method suffers from low automation (the output power of the optical energy at the power supply end needs to be manually adjusted or is a preset value), single judgment condition (the output power of the optical energy at the power supply end is adjusted according to the amplitude of the feedback load envelope signal), and poor adaptability to the working environment (especially when the laser is operating at high power, the internal resistance of the photoelectric conversion device increases due to aging or harsh circuit environment, and the power output of the transmitting laser can only be adjusted by detecting the change in the amplitude of the modulation signal output by the photoelectric conversion module).

[0072] Please refer to Figure 2 This is an embodiment of the power output characteristic curve of the photoelectric conversion module, including an I-axis (current axis), a U-axis (voltage axis), a P-axis (power axis), and an output characteristic curve. The output characteristic curve includes an IV curve (current-voltage corresponding curve) and a PV curve (power-voltage corresponding curve). Under stable laser power input (optical energy transmitted through optical fiber) and operating environment (temperature, etc.), the intersection of the IV curve with the current axis (I-axis) of the photoelectric conversion module 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 coordinates are Im and Vm, respectively, representing the current and voltage values ​​at the maximum power point. If the photoelectric conversion module 4 is not operating at point A, it has two operating points with the same power Pc, located to the left and right of point A (e.g.,...). Figure 2 Points C and B in the diagram). The photoelectric conversion module can be regarded as a nonlinear DC power supply, which has low internal resistance in the higher voltage region, such as the location of point B; and high internal resistance in the lower voltage region, such as the location of point C.

[0073] As shown by the curves, the volt-ampere characteristics of the photoelectric conversion module change significantly near point C, and its internal impedance is highly sensitive to changes. Even a small change in the load current can cause a large voltage fluctuation, which is detrimental to the stability of the entire system. When the tangent slope (ΔP / ΔV) at any point on its PV curve is greater than 0, the internal impedance is high in the region near point C (e.g., between point C and point A), resulting in high internal resistance characteristics and relatively large power loss. In the region near point B (e.g., between point A and point B), the IV curve is flat, the internal resistance changes little, and the tangent slope (ΔP / ΔV) at any point on its PV curve is less than 0, representing a stable operating region for the system. When operating at the maximum power point at point A, the photoelectric converter has the highest output efficiency and the lowest internal resistance; the tangent slope (ΔP / ΔV) at the maximum power point on its PV curve is 0.

[0074] Current closed-loop control systems for fiber optic power systems simply adjust the laser output power based on feedback signals from the load end, obtaining the corresponding electrical energy supply through the photoelectric conversion module. However, this simplistic approach fails to consider the nonlinear output characteristics of the photoelectric conversion device. As the photoelectric conversion device ages or the load dissipation power changes, simply adjusting the laser output power at the transmitting end based on feedback voltage signals or load power envelope signals may cause the photoelectric conversion module to fall into the region of point C, leading to instability in the control system. Furthermore, when the laser operates at high power output, aging tends to increase the internal resistance of the photoelectric conversion device. Coupled with a modulation signal at the laser driver end of the power supply, adjusting the laser output power by detecting changes in the amplitude of the modulation signal output from the photoelectric conversion module requires a high-power laser, which obviously increases the circuit cost at the power supply end.

[0075] In one embodiment of this 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 the stable operation of the load circuit of the fiber optic power supply device.

[0076] In one embodiment of this 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. The external matching is adjusted in real time to ensure that the output power of the photoelectric conversion module operates stably near the maximum power point. This ensures 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.

[0077] In this embodiment, based on the characteristic that the output PV curve of the photoelectric conversion module is continuously differentiable, the MPP point of the photoelectric conversion module and the stable working region of the low-resistance system are divided by the conductivity coefficient. The equivalent conductivity coefficient of the output load is adjusted in real time, and according to the preset target coefficient, the output power of the photoelectric conversion module can flexibly work at the MPP point or stably work in the preset stable region of the low resistance of the photoelectric conversion module, thereby reducing the energy loss of the fiber optic power supply system. This not only improves the energy conversion efficiency of the high fiber optic power supply system, but also enables the application of the fiber optic power supply system in measuring instruments and equipment.

[0078] Example 1:

[0079] like Figure 1 As shown, this application discloses an optical fiber power supply system for measuring instruments, including a power-consuming terminal 200 that receives optical energy through an optical fiber and converts the received optical energy into electrical energy to provide operating power for a load 6. The power-consuming terminal 200 includes a photoelectric conversion module 4, a remote power conversion module 5, a power supply monitoring module 7, and an optical energy transmission control module 8. The photoelectric conversion module 4 receives laser light transmitted through the optical fiber via a photoelectric converter and converts the optical energy into electrical energy to obtain a first power source. The remote power conversion module 5 converts the first power source into a second power source according to a preset power supply parameter and uses the second power source as the operating power source for the load 6. The power supply monitoring module 7 monitors the electrical parameters of the first and second power sources and sends them to the optical energy transmission control module 8. The optical power 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 power of the laser transmitted through the optical fiber, so that the output voltage value of the first power supply is not less than a preset start-up voltage value Vset, wherein the start-up voltage value Vset is a preset minimum voltage value of the second power supply output by the remote power conversion module 5. The optical power transmission control module 8 is also used to, when the output voltage value of the second power supply is not less than the start-up voltage value Vset, adjust the electrical parameters of the second power supply to control the output power of the photoelectric conversion module 4 to maintain it within a specific stable region between the maximum power point and the low-resistance state. The specific stable region of the low-resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, where the slope of the tangent line at any point on the power-voltage curve is less than 0. (See [reference]). Figure 2 The curve segment from point A to point B on the IV curve (current-voltage curve). The power supply monitoring module 7 monitors the electrical parameters of the first power supply, including its operating current I1 and operating voltage V1, and the electrical parameters of the second power supply, including its operating voltage V2.

[0080] In one embodiment, the optical power 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 according to the internal resistance adjustment signal, thereby changing the equivalent resistance of the external load 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 power transmission control module 8 is configured to control the value of the equivalent resistance of the external load of the photoelectric conversion module 4 to be not less than the value of the current internal impedance of the photoelectric conversion module 4 through the internal resistance adjustment signal, so that the output power of the photoelectric conversion module is maintained within a specific stable region between the maximum power point (MPP) and the low resistance state.

[0081] In one embodiment, when the operating voltage V2 of the second power supply is less than the start-up voltage Vset, the optical power transmission control module 8 sends power adjustment parameters to the power supply end 100 of the optical fiber power supply system so that the power supply end 100 can increase the optical power of the laser transmitted through the optical fiber according to the power adjustment parameters.

[0082] Please refer to Figure 3 The diagram below illustrates a flow chart of an optical fiber power supply method in one embodiment. Another embodiment of this application discloses an optical fiber power supply method for measuring instruments, applicable to the optical fiber power supply system described above. This optical fiber power supply method includes:

[0083] Step 101: Obtain power conversion parameters.

[0084] Obtain the current-voltage curve and power-voltage curve from the power conversion parameters of the photoelectric conversion module.

[0085] Step 102: Obtain the maximum power point.

[0086] The maximum power point and the specific stable region of the low-resistance state are obtained based on the current-voltage curve and the power-voltage curve. The specific stable region of the low-resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, where the slope of the tangent line to the power-voltage curve at any point on this segment is less than 0.

[0087] Step 103: Obtain electrical parameters.

[0088] Obtain the electrical parameters of the first and second power supplies.

[0089] Step 104: Adjust the equivalent resistance.

[0090] When the voltage of the second power supply is not less than a preset start-up voltage value Vset, by adjusting the electrical parameters of the second power supply, the value of the equivalent resistance of the external load of the photoelectric conversion module is controlled to be not less than the value of the internal impedance of the current photoelectric conversion module, thereby making the output power of the photoelectric conversion module maintain within a specific stable region of maximum power point and low resistance state. Here, the start-up voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

[0091] To facilitate understanding of the application of the optical fiber power supply method disclosed in the embodiments of this application, a specific embodiment is described below, including:

[0092] Please refer to Figure 4 The diagram below shows the functional structure of the optical fiber power supply system in another embodiment. The optical power transmission control module 8 at the power consumption end includes an MCU microcontroller U1, and 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 power 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, and the photoelectric conversion module 2 is a laser D2. The current source S2 and the internal resistance Ri constitute 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. It converts the first power supply to the second power supply and includes a controlled switch Q1, a unidirectional transistor D1, a first capacitor C1, a second capacitor C2, and a first inductor L1. The controlled switch Q1 is a MOS switch, the unidirectional transistor D1 is a freewheeling diode, and the internal resistance adjustment signal is a pulse-width adjustable pulse signal (PWM control signal). The controlled switch Q1 is turned on or off by the PWM signal output from the light energy transmission control module 8. The load is represented by the circuit impedance, and the voltage signal across it represents the second power supply (…). Figure 4 The voltage value Vo of the second power supply is its output operating voltage V2. Figure 4 The internal output voltage Vs of the medium current source S2 represents the output voltage V1 of the photoelectric conversion module 4, and the output current I1 of the photoelectric conversion module 4 represents the output current, i.e., the output voltage V1 and output current I1 of the first power supply. Figure 4 The workflow of the fiber optic power supply system shown includes:

[0093] 1. System startup process.

[0094] The MCU microcontroller U1 controls the adjustable current source S1 to output the drive current Id1, which drives the laser D2 to emit light, based on the preset value of the laser drive current (this preset value can drive the laser to emit light and use the energy output by the photoelectric conversion module 4 at the power end to drive the power end control circuit and the voltage-current detection circuit to work normally and provide feedback voltage-current detection signal). According to the control requirements of the adjustable current source control signal Vctr1, in this embodiment, the control signal is PWM (Pulse Width Modulation) or Pulse Density Modulation signal or output voltage signal.

[0095] 2. Monitor the circuit startup process.

[0096] The optical signal output by laser D2 is transmitted through optical fiber to photoelectric conversion module 4, which converts the optical signal into an electrical signal output current source S2. The output voltage V1 and current I1 are sent to the remote power conversion module 5. Current detection circuit U2 and voltage detection circuit U3 feed back the detected operating current I1 and operating voltage V1 values ​​to MCU microcontroller U1, respectively.

[0097] 3. Laser power adjustment process.

[0098] The MCU microcontroller U1 sets the startup voltage value Vset through data analysis (the device at the power-consuming end 6 usually has a minimum startup voltage requirement, i.e., the preset startup voltage value Vset, which is higher than the minimum operating voltage of the power-consuming end device). When the voltage V1 of the first power supply output of the photoelectric conversion module 4 is less than the set startup voltage value Vset, the current source S1 at the control end gradually increases the output of the first driving current Id1, driving the laser D2 to increase the emission power, until the voltage V1 output of the photoelectric conversion module 4 is greater than the startup voltage value Vset.

[0099] 4. Maximum output power adjustment process.

[0100] When the voltage V1 at the operating point of the photoelectric conversion module 4 is greater than the set start-up voltage Vset, the duty cycle of the internal resistance adjustment signal (taking the PWM signal as an example) output to the remote power conversion module 5 is adjusted by the control signal Vctr2. This changes the equivalent resistance of the external load of the photoelectric conversion module 4 to match its internal impedance, making the equivalent resistance of the external load 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 the photoelectric conversion module 4 is stably operating at its maximum power point. With a fixed incident laser power, the maximum output power of the photoelectric conversion module 4 results in the highest photoelectric conversion efficiency and the lowest heat dissipation within the module.

[0101] 5. Continuous adjustment process.

[0102] As the ambient temperature changes slowly or the components age, the conversion efficiency of the emitting laser and photoelectric conversion module 4 decreases, causing the operating voltage V1 at the operating point to fall below Vset. In this case, the system startup process is re-executed. At this point, the threshold Vset also needs to be lowered. To ensure system stability in engineering implementation, a hysteresis interval б (an adjustable preset value) is designed, meaning that the system startup process is only re-executed when the operating voltage V1 at the operating point falls below Vset – б.

[0103] The optimization principle and process of adjusting the maximum output power are described as follows:

[0104] like Figure 2 As shown, 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 unique maximum power point MPP, and the voltage and current corresponding to the defined point are Vm and Im, respectively. It can be seen that the photoelectric conversion module can be regarded as a nonlinear DC power supply, which has low internal resistance in the higher voltage region and high internal resistance in the lower voltage region. When it operates in the high voltage region, it can be equivalent to a voltage source, and when it operates in the low voltage region, it can be equivalent to a current source.

[0105] Please refer to Figure 5 This is a simplified output model diagram 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 equivalent resistance of the load network equals the internal resistance of the source network. Any power supply network can be simplified to consist of a power source and a load. If the internal impedance equals the input impedance of the load, the power source can achieve maximum power output.

[0106] Because the output characteristics of a semiconductor device like a photoelectric conversion module, which has nonlinear internal resistance, are unique, its current-voltage characteristic curve decreases monotonically from... Figure 2 The output characteristic curve of the photoelectric conversion module shows that at the MPP point, the dynamic impedance of the photoelectric conversion module is equal to the negative derivative of the voltage with respect to the current at that point. If we define the negative derivative of the voltage with respect to the current as the dynamic equivalent internal impedance, then the above theory of maximum power output holds, specifically including:

[0107] ;

[0108] The equivalent input impedance of the photoelectric conversion module is defined as follows:

[0109] R eq =V1÷I1;

[0110] Therefore, in a nonlinear system with first-order monotonic internal impedance characteristics, maximum power can be obtained when the equivalent impedance is matched, which can be expressed by the following formula:

[0111] R i =R eq ;

[0112] Define the dynamic equivalent impedance deviation ε, then the formula for obtaining the dynamic equivalent impedance deviation ε is:

[0113] ε=R eq - R i ;

[0114] Therefore, the impedance deviation ε can be made zero by dynamically adjusting the output voltage and output current of the photoelectric converter.

[0115] Ideally, ignore Figure 4 The minimal energy loss of components such as the first inductor L1 and freewheeling diode D1 in the mid-to-long-range power conversion module 5, and the voltage and current detection circuits in the power supply monitoring module 7, means that the output power of the photoelectric conversion module 4 is entirely applied to the load 6, resulting in:

[0116] V1×I1=Vo 2 ÷R load ;

[0117] Vo÷V1=1 / (1-D);

[0118] Among them, R load Let V1 be the load equivalent resistance, V1 be the output voltage of the photoelectric conversion module, I1 be the output current of the photoelectric conversion module, and D be the duty cycle of the controlled switch Q1. Combining the above two formulas, the formula for obtaining the external equivalent impedance of the photoelectric conversion module can be obtained as follows:

[0119] R eq =(1-D) 2 ×R load ;

[0120] From the above formula, it can be seen that 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:

[0121] ε=(1-D) 2 ×R load - R i ;

[0122] That is, by adjusting the duty cycle D of the PWM control signal of the input remote power conversion module 5, the impedance deviation ε can be changed so that the equivalent resistance of the load network is equal to the internal resistance of the source network, and the source network outputs the maximum power.

[0123] Please refer to Figure 6 The above is a flowchart of a method for adjusting the external load equivalent resistance of a photoelectric conversion module in one embodiment. Based on the dynamic equivalent impedance deviation ε defined in this application embodiment, a method for adjusting the external load equivalent resistance of a photoelectric conversion module is disclosed below, specifically including:

[0124] Step 201: Obtain the preset voltage value.

[0125] The default startup voltage value Vset can be set, or the startup voltage value Vset can be changed.

[0126] Step 202: Obtain the electrical parameters of the first power supply.

[0127] Obtain the real-time operating voltage V1 and operating current I1 of the first power supply.

[0128] Step 203: Determine the size relationship between V1 and Vset.

[0129] When the operating voltage V1 is less than the starting voltage value Vset, proceed to step 204.

[0130] Execute step 205 when the operating voltage V1 is not less than the starting voltage value Vset.

[0131] Step 204: Increase laser power.

[0132] When the voltage V1 of the first power supply output of the photoelectric conversion module 4 is less than the set start-up voltage Vset, the current source S1 at the control power supply terminal gradually increases the output of the first driving current Id1, driving the laser D2 to increase its luminous power, until the voltage V1 output of the photoelectric conversion module 4 is greater than the start-up voltage Vset. Steps 201, 202, 203, and 204 form the first closed control loop.

[0133] Step 205: Calculate the internal resistance and equivalent external resistance.

[0134] The internal resistance is obtained based on the operating voltage V1 and the operating current I1. The equivalent resistance of the external load is obtained using the formula for obtaining the external equivalent impedance.

[0135] Step 206, calculate ε.

[0136] 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, and when the value of the impedance deviation ε is not 0, step 208 is executed.

[0137] Step 207: Adjust the duty cycle D.

[0138] The duty cycle of the internal resistance adjustment signal (taking PWM signal as an example) output to the remote power conversion module 5 is adjusted by the control signal Vctr2, thereby changing the equivalent resistance of the external load of the photoelectric conversion module 4 to match the internal impedance of the current photoelectric conversion module 4.

[0139] Step 208, end the adjustment.

[0140] Since the impedance deviation ε is 0, the equivalent resistance of the external load of the photoelectric conversion module matches the internal impedance of the current photoelectric conversion module. That is, the equivalent resistance of the external load is equal to the internal impedance of the photoelectric conversion module. At this time, the output power of the photoelectric conversion module operates stably at the maximum power point. When the incident laser power is constant, the output power of the photoelectric conversion module is the maximum, resulting in the highest photoelectric conversion efficiency and the lowest heat dissipation in the photoelectric conversion module.

[0141] It is important to note in this embodiment that the judgment condition for executing step 207 or step 208 in step 206 is whether the value of impedance deviation ε is 0 (i.e., the equivalent resistance Req of the external load and the internal impedance Ri are equal). However, in practical applications, it is difficult to keep the output power of the photoelectric conversion module stable at the maximum power point. In one embodiment of this application, the judgment condition for executing step 207 or step 208 in step 206 is whether the value of 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 equivalent resistance Req of the external load is greater than the internal impedance Ri (i.e., controlling the output power of the photoelectric conversion module to be maintained within a specific stable region of low resistance state), and otherwise executing step 208. In one embodiment, the impedance deviation ε is set to a value range of [0, β), where β is a positive number greater than 0. When the impedance deviation ε is between [0, β), step 208 is executed; otherwise, step 207 is executed. This is equivalent to controlling the output power of the photoelectric conversion module to remain within a specific stable region between the maximum power point and the low impedance state (e.g., Figure 2 (between points A and B as shown), thereby ensuring that the output power of the photoelectric conversion module does not enter the high-resistivity region.

[0142] 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. Communication between the two controllers can be achieved through optical fiber transmission or through transmission interfaces with electrical isolation characteristics such as wireless WIFI, Bluetooth, and ZigBee.

[0143] 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 supply. The remote power conversion module includes a Boost converter for converting the first power supply into a second power supply. The Boost converter includes a controlled switch Q1, a unidirectional conducting 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 for inputting 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 supply. The controlled switch 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 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 transistor D1 is connected to the positive terminal of the controlled switch Q1, and the negative terminal of the unidirectional transistor D1 is connected to the load to serve 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 transistor D1, and the other end is connected to the negative terminal of the controlled switch Q1.

[0144] 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 (unidirectional conduction 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:

[0145] ;

[0146] When the controlled switch Q1 is turned off within the Toff time, the freewheeling diode D1 turns on, and the energy stored in the power supply and inductor simultaneously supplies power to the second capacitor C2 and the load, causing the inductor current to decrease linearly. The absolute value of the decrease in inductor current is:

[0147] ;

[0148] When this circuit is operating in steady state, the increase in inductor current is the same as the decrease in inductor current. Therefore, the relationship between the output voltage and input voltage of the second power supply is as follows:

[0149] Vo÷V1=1 / (1-D);

[0150] Where D is the duty cycle of the Vctr2 (PWM) signal, which in one embodiment is between 0 and 1 to meet the application scenarios of boost adjustment.

[0151] Please refer to Figure 7This 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 supply. The remote power conversion module includes a Buck converter for converting the first power supply into a second power supply. The Buck converter includes a controlled switch Q1, a unidirectional conducting 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 for inputting an internal resistance adjustment signal. The controlled switch 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 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 terminal of the unidirectional conducting transistor D1. The positive terminal of the unidirectional 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 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 transistor D1.

[0152] In such Figure 7 In the photoelectric conversion module shown, when the controlled switch Q1 is turned on during the Ton time period, 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 equivalent resistance Rload of the load 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 period, the freewheeling diode D1 is turned on due to the discharge of the inductor. At this time, the first inductor L1, the second capacitor C2, and the equivalent resistance Rload of the load form a loop, and the first inductor L1 becomes the power supply to the load. The energy stored and released by the first inductor L1 in one period T is the same, so the average value of the voltage across the load is:

[0153] Vo=T on ÷(T on +T off )×V1=T on ÷T×V1= D×V1;

[0154] Where D is the duty cycle of the Vctr2 (PWM) signal, which in one embodiment is between 0 and 1 to meet the application scenarios of buck regulation.

[0155] Please refer to Figure 8This 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 supply. The remote power conversion module includes a Buck-Boost converter for converting the first power supply into a second power supply. The Buck-Boost converter includes a controlled switch Q1, a unidirectional conducting 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 for inputting an internal resistance adjustment signal. The controlled switch 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 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 terminal of the unidirectional conducting transistor D1. The positive terminal of the unidirectional transistor D1 is used 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 transistor D1, and the other end is used 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 transistor D1.

[0156] In one embodiment, the controlled switch Q1 is a MOS switch, the unidirectional conduction diode D1 is a freewheeling diode, and the internal resistance adjustment signal is a pulse signal with adjustable pulse width. In one embodiment, when the internal resistance adjustment signal is high, 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 low, the MOS switch is turned off to disconnect the electrical connection between the positive and negative terminals of the controlled switch Q1.

[0157] In such Figure 8 In the photoelectric conversion module shown, when the controlled switch Q1 is turned on during the Ton time period, the freewheeling diode (unidirectional conduction diode) D1 is in the off state. The power supply charges the first inductor L1, and the inductor 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 period, the freewheeling diode D1 is turned on. At this time, the first inductor L1, which stores energy, releases energy to supply power to the load, and the voltage direction at the load is opposite to the power supply direction. When the circuit is in a steady state, the energy stored and released by the energy-storing inductor is equal within one switching cycle T, so the average voltage across the equivalent resistance Rload of the load is:

[0158] Vo=T on ÷(T on +T off )×V1=T on ÷T×V1= D×V1;

[0159] Where 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 output by the second power supply is... Figure 8 The voltage value Vo of the second power supply (which is its output operating voltage V2) is less than the output voltage V1, exhibiting buck characteristics. In one embodiment, when the value of D is between 0.5 and 1, the output voltage Vo is greater than the output voltage V1, exhibiting boost characteristics, thus adapting to both boost and buck scenarios.

[0160] The fiber optic power supply method disclosed in one embodiment of this application is a dynamic real-time dual closed-loop control method for the fiber optic power 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 fiber optic power supply device. By dynamically detecting the deviation between the dynamic internal resistance of the photoelectric conversion module and the equivalent load impedance through a voltage-current detection device, and by real-time control and adjustment of the external matching, the output power of the photoelectric conversion module is stably operated 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.

[0161] The fiber optic power supply system disclosed in this application includes a power-consuming end, which comprises a photoelectric conversion module, a remote power conversion module, a power supply monitoring module, and a light transmission control module. The photoelectric conversion module converts optical energy input from the fiber optic cable into electrical energy to obtain a first power source. The remote power conversion module converts the first power source into a second power source to serve as the operating power source for the load. The power supply monitoring module monitors the electrical parameters of the first and second power sources. The light transmission control module controls the output power of the photoelectric conversion module to maintain it within a specific stable region between the maximum power point and the low-resistance state by adjusting the electrical parameters of the second power source when its output is not less than the starting voltage value. By employing a dual closed-loop control method to set the output power of the photoelectric conversion module, energy loss during photoelectric conversion is reduced, its actual operating temperature is lowered, and thus the reliability of the photoelectric conversion module is improved.

[0162] Example 2:

[0163] In Embodiment 1, the value of the external load equivalent resistance of the photoelectric conversion module is controlled by an internal resistance adjustment signal to ensure that it is not less than the current internal impedance of the photoelectric conversion module. This allows the output power of the photoelectric conversion module to be maintained within a specific stable region between the maximum power point and the low-resistance state. For example... Figure 6As shown, the idle ratio of the internal resistance adjustment signal (PWM) is adjusted 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. When the impedance deviation ε is greater than 0, the output power of the photoelectric conversion module is maintained within a specific stable region of low resistance). This adjusts the current value I1 and voltage value V1 of the first power supply to achieve the adjustment of the external load equivalent resistance Req.

[0164] This embodiment discloses a method for adjusting the equivalent conductivity of the load in real time using the conductivity method, so that the photoelectric conversion module operates in the ΔP / ΔV ≤0 region of the PV curve, 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.

[0165] By comparing the conductance and its change at a certain moment output by the photoelectric conversion module, the position difference between the current operating point and the maximum power point (or a specific power point) can be determined. The principle behind this determination of the direction of the next conductance change adjustment includes:

[0166] 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 the derivative, when it is exactly at the maximum power point, its derivative value is 0, and the slope of its PV curve satisfies the following equation:

[0167] P = V × I;

[0168] Differentiating both sides of the above equation with respect to V, we get:

[0169] dP / dV = I + V × dI / dV;

[0170] When the power point is at its maximum value on the curve, and dP / dV = 0, the maximum power value can be obtained as follows:

[0171] dI / dV = -(1 ÷ V);

[0172] 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.

[0173] 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 falling curve to the right of the MPP point.

[0174] In such Figure 5 In the simplified output model of the photoelectric conversion module shown, the following is ignored: Figure 4The minimal energy loss of components such as the first inductor L1 and freewheeling diode D1 in the mid-to-long-range power conversion module 5, and the voltage and current detection circuits in the power supply monitoring module 7, means that the output power of the photoelectric conversion module 4 is entirely applied to the load 6, resulting in:

[0175] V1×I1=V0 2 ÷R load ;

[0176] V0÷V1=1÷(1-D);

[0177] Among them, R load Let V1 be the equivalent resistance of the load, I1 be the output voltage of the photoelectric conversion module, D be the output current of the photoelectric conversion module, and D be the duty cycle of the controlled switch Q1. Combining the above two formulas, the formula for obtaining the external equivalent conductance of the photoelectric conversion module can be obtained as follows:

[0178] Geq = I1 ÷ V1 = 1 ÷ [(1-D)] 2 ×R load ];

[0179] 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 adjustment signal (PWM).

[0180] α = dI1 / dV1 + I1 / V1;

[0181] Where α is the conductivity deviation adjusted incrementally.

[0182] When α=0, the output voltage of the photoelectric conversion module is the voltage value at the MPP point.

[0183] When α > 0, the output voltage of the photoelectric conversion module is less than the voltage value at the MPP point, and its value is at this time. Figure 2 The MPP point is shown on the rising curve to the left.

[0184] When α < 0, the output voltage of the photoelectric conversion module is greater than the voltage value at the MPP point, and its value is at this time. Figure 2 The MPP point is shown on the descending curve to the right.

[0185] As can be seen from the above, the equivalent conductance of the photoelectric conversion module can be changed by adjusting the duty cycle D of the internal resistance adjustment signal (PWM). At the same time, it can be determined whether the conductance deviation α is less than or equal to zero, so that the output power of the photoelectric conversion module can be stably maintained within a specific stable region between the maximum power point and the low resistance state.

[0186] Please refer to Figure 9The diagram below illustrates a fiber optic power supply method in another embodiment. It utilizes the aforementioned method of adjusting the duty cycle D based on the conductivity deviation α to control the photoelectric conversion module to ultimately operate within a specific stable region of maximum power point (MPP) and low resistance state. Specifically, this includes:

[0187] Step 301: Obtain preset parameters.

[0188] The default startup voltage value Vset can be set, or the startup voltage value Vset can be changed.

[0189] Step 302: Obtain the electrical parameters of the first power supply.

[0190] Obtain the real-time operating voltage V1 and operating current I1 of the first power supply.

[0191] Step 303: Calculate the Geq value.

[0192] The Geq value is obtained using the formulas dV=V1´-V1, dI=I1´- I1, and Geq = I1´ / V1´. Here, Geq is the external equivalent conductance of the photoelectric conversion module.

[0193] Step 304: Obtain the value of α.

[0194] Obtain the preset conductivity deviation α or change the magnitude of the conductivity deviation α, and calculate the actual conductivity deviation α using the formula dI1 / dV1+I1 / V1.

[0195] If the preset value of the preset conductance deviation α is 0, and the calculated conductance deviation α is also 0, then step 307 is executed; otherwise, step 305 is executed.

[0196] Step 305: Determine the relationship between α and Geq.

[0197] When the left and right sides of the formula α = dI / dV + Geq are equal, proceed to step 310; otherwise, proceed to step 306.

[0198] Step 306: Adjust the duty cycle D.

[0199] The duty cycle of the internal resistance adjustment signal (taking the 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 current I1 of the first current.

[0200] Step 307: Determine the dV value.

[0201] Execute step 309 when the dV value is 0, otherwise execute step 308.

[0202] Step 308: Determine the Geq value.

[0203] If the Geq value is equal to dI / dV, proceed to step 310; otherwise, proceed to step 306.

[0204] Step 309: Determine the dI value.

[0205] When the dI value is equal to 0, execute step 310; otherwise, execute step 306.

[0206] When α=0, the output voltage of the photoelectric conversion module is the voltage value at the MPP point. When α>0, the output voltage of the photoelectric conversion module is less than the voltage value at the MPP point, and its value is within... Figure 2 The curve to the left of the MPP point is shown. When α < 0, the output voltage of the photoelectric conversion module is greater than the voltage value at the MPP point, and its value is at... Figure 2 The MPP point is shown on the descending curve to the right.

[0207] In the above-described method of controlling the photoelectric conversion module by adjusting the duty cycle D based on the defined conductance deviation α, the output voltage is changed by continuously altering the duty cycle D, thus changing the equivalent conductance value of the photoelectric module. The target conductance deviation α in the entire control flow can be dynamically set. If the adjusted target conductance deviation α is zero, the photoelectric conversion module ultimately operates at the maximum power point (MPP), achieving optimal output efficiency and low internal resistance—an ideal state of adjustment. However, due to load changes or temperature variations in the photoelectric conversion device, or aging, adjustments become more frequent. This also considers branching the control flow when both dI / dV and dV are equal to 0. If the adjusted target conductance deviation α is less than a specific value, the photoelectric conversion module's output power stabilizes within a specific stable region of low resistance, and the output efficiency is relatively high (see [reference]). Figure 2 The area between point A and point B in the diagram shows that the fiber optic power supply system is in a relatively stable state.

[0208] In this embodiment, the output current of the laser can also be dynamically adjusted by real-time detection of the output voltage of the photoelectric conversion module (the electrical parameters of the first power supply), ensuring stable operation of the load circuit of the fiber optic power supply device (ensuring that the voltage at the load end is not less than the starting voltage value Vset). In particular, by dynamically detecting the output voltage and current of the photoelectric conversion module using a voltage-current detection device, and by real-time control and adjustment of the external equivalent conductance value using the conductance method, the fiber optic power supply system is in a relatively stable state within a specific stable region of the low-resistance state of the photoelectric conversion module. Furthermore, the deviation value of the target conductance can be dynamically set throughout the entire control process, thus allowing for flexible selection of the optimal output efficiency of the photoelectric conversion module in the fiber optic power supply system. This can be set at the MPP point or within a specific stable region of the low-resistance state, thereby ensuring the stability of the entire power supply system.

[0209] Example 3:

[0210] Please refer to Figure 10 The diagram below illustrates the functional structure of a photoelectric power supply 300 in one embodiment. The photoelectric power supply 300 includes a photoelectric conversion module 4, a remote power conversion module 5, a power supply monitoring module 7, and a photoelectric transmission control module 8. The photoelectric conversion module 4 receives laser light transmitted via optical fiber through a photoelectric converter and converts the light energy into electrical energy to obtain a first power source. The remote power conversion module 5 converts the first power source into a second power source according to preset power supply parameters and uses the second power source as the operating power source output by the photoelectric power supply. The power supply monitoring module 7 monitors the electrical parameters of the first and second power sources and sends them to the photoelectric transmission control module 8. The electrical parameters monitored by the power supply monitoring module 7 include the operating current I1 and operating voltage V1 of the first power source. The optical power transmission control module 8 is used to control the output power of the photoelectric conversion module 4 to be maintained within a specific stable region between the maximum power point and the low resistance state when the operating voltage V1 of the first power supply is not less than the starting voltage value Vset, by adjusting the electrical parameters of the second power supply. The specific stable region of the low resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the slope of the tangent line of the power-voltage curve corresponding to any point on this segment is less than 0. The starting voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

[0211] In one embodiment, the power supply monitoring module 7 monitors the electrical parameters of the first power supply, including its operating current I1 and operating voltage V1, and the electrical parameters of the second power supply, including its output operating voltage V2. The optical power 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 sets the electrical parameters of the second power supply according to the internal resistance adjustment signal to change the equivalent resistance of the external load 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 power transmission control module 8 controls the value of the equivalent resistance of the external load of the photoelectric conversion module 4 to be not less than the current internal impedance value of the photoelectric conversion module 4 through the internal resistance adjustment signal, so that the output power of the photoelectric conversion module 4 is maintained within a specific stable region between the maximum power point and the low resistance state.

[0212] In one embodiment, the remote power conversion module 5 includes a Boost converter, a Buck converter, and / or a Buck-Boost converter. The circuit connection methods of each are as described in Embodiment 1 for the Boost converter, Buck converter, and Buck-Boost converter, and will not be repeated here.

[0213] 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 a 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.

[0214] In one embodiment, the optical power transmission control module controls the electrical parameters of the second power supply based on the conductance deviation value α and the idle percentage of the external equivalent conductance Geq adjustment signal to regulate the internal resistance. This maintains the value of the external load equivalent resistance of the photoelectric conversion module at least equal to the value of the current internal impedance of the photoelectric conversion module, ensuring that the output power of the photoelectric conversion module remains within a specific stable region of maximum power point and low resistance state. The method for adjusting the idle percentage of the internal resistance adjustment signal based on the conductance deviation value α and the external equivalent conductance Geq is described in Embodiment Two. Figure 9 The flowchart shown is described below. The formulas for obtaining the conductance deviation value α and the external equivalent conductance Geq are:

[0215] α = dI1 / dV1 + I1 ÷ V1;

[0216] Geq = I1 ÷ V1 = 1 ÷ [(1-D)] 2 ×R load ];

[0217] Where α is the conductance deviation, 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 voltage, Geq is the external equivalent conductance, and R... load Where is the equivalent resistance of the load, and D represents the duty cycle of the internal resistance adjustment signal.

[0218] In one embodiment, the optical power transmission control module adjusts the idle percentage 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 at no 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 a specific stable region of maximum power point and low resistance state. The method for adjusting the idle percentage of the internal resistance adjustment signal based on the dynamic equivalent impedance deviation ε is described in Embodiment 1. Figure 6 The flowchart shown is described below. The formula for obtaining the dynamic equivalent impedance deviation ε is:

[0219] ε=(1-D) 2 ×R load - R i ;

[0220] Where ε is the dynamic equivalent impedance deviation, R loadR represents the load equivalent resistance, D represents the duty cycle of the internal resistance adjustment signal, and R represents the load equivalent resistance. i This represents the internal impedance of the photoelectric conversion module.

[0221] One embodiment of this application also discloses an optical fiber power supply system, including the optical power conversion power source described above. See [link to optical fiber power supply system] for details. Figure 1 The functional block diagram shown in this embodiment, compared to the light energy conversion power supply... Figure 1 The power supply terminal in the middle.

[0222] One embodiment of this application also discloses an optical fiber power supply method for use in the optical fiber power supply system described above, such as... Figure 3 As shown, the optical fiber power supply method includes:

[0223] Step 101: Obtain power conversion parameters.

[0224] Obtain the current-voltage curve and power-voltage curve from the power conversion parameters of the photoelectric conversion module.

[0225] Step 102: Obtain the maximum power point.

[0226] The maximum power point and the specific stable region of the low-resistance state are obtained based on the current-voltage curve and the power-voltage curve. The specific stable region of the low-resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, where the slope of the tangent line to the power-voltage curve at any point on this segment is less than 0.

[0227] Step 103: Obtain electrical parameters.

[0228] Obtain the electrical parameters of the first and second power supplies.

[0229] Step 104: Adjust the equivalent resistance.

[0230] When the voltage of the second power supply is not less than a preset start-up voltage value Vset, by adjusting the electrical parameters of the second power supply, the value of the equivalent resistance of the external load of the photoelectric conversion module is controlled to be not less than the value of the internal impedance of the current photoelectric conversion module, thereby making the output power of the photoelectric conversion module maintain within a specific stable region of maximum power point and low resistance state. Here, the start-up voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module.

[0231] The optical power conversion power supply disclosed in this application includes a photoelectric conversion module, a remote power conversion module, a power supply monitoring module, and an optical power transmission control module. The photoelectric conversion module converts optical energy input from the optical fiber into electrical energy to obtain a first power source. The remote power conversion module converts the first power source into a second power source to serve as the operating power source for an external load. The power supply monitoring module monitors the electrical parameters of the first and second power sources. The optical power transmission control module controls the output power of the photoelectric conversion module to remain within a specific stable region between the maximum power point and the low-resistivity state by adjusting the electrical parameters of the second power source. By controlling the output power of the photoelectric conversion module to remain within the specific stable region between the maximum power point and the low-resistivity state, the photoelectric conversion efficiency of the photoelectric conversion module is guaranteed, thus reducing energy loss during photoelectric conversion and lowering its actual operating temperature, thereby greatly improving the reliability of the optical power conversion power supply.

[0232] Those skilled in the art will understand that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, which may include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to achieve the above functions. For example, the program can be stored in the memory of a device, and when the program in the memory is executed by the processor, all or part of the above functions can be achieved. In addition, when all or part of the functions in the above embodiments are implemented by computer programs, the program can also be stored in a server, another computer, disk, optical disk, flash drive, or external hard drive, etc., and can be downloaded or copied to the memory of a local device, or the system of the local device can be updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be achieved.

[0233] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A fiber optic power supply system for measuring instruments, characterized in that, This includes the power-consuming end, which receives optical energy through optical fiber and converts the received optical energy into electrical energy to provide working power for the load; The power-consuming terminal 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 laser light transmitted through optical fiber via a photoelectric converter and convert the light energy 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 according to a preset power supply parameter, and use the second power source as the working power source for 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 power transmission control module is used to obtain the 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 power supply system to adjust the optical 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 start-up voltage value Vset; wherein, the start-up voltage value Vset is the preset minimum voltage value of the second power supply output by the remote power conversion module. The optical power transmission control module is further configured to, when the output voltage of the second power supply is not less than the start-up voltage Vset, adjust the electrical parameters of the second power supply to control the output power of the photoelectric conversion module to be maintained within a specific stable region between the maximum power point and the low resistance state. The specific stable region of the low resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the slope of the tangent line at any point on the power-voltage curve corresponding to any point on this segment is less than 0.

2. The fiber optic power supply system as described in claim 1, characterized in that, The power supply monitoring module monitors the electrical parameters of the first power supply, including the operating current I1 and operating voltage V1, and the electrical parameters of the second power supply, including the operating voltage V2. The optical power transmission control module is also used to output an internal resistance adjustment signal to the remote power conversion module. The remote power conversion module is used to set the electrical parameters of the second power supply according to the internal resistance adjustment signal, so as to change the equivalent resistance of the external load compared with 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 power 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 value of the current 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 a specific stable region between the maximum power point and the low resistance state.

3. The fiber optic power supply system as described in claim 2, characterized in that, When the operating voltage V2 of the second power supply is less than the starting voltage value Vset, the optical power transmission control module sends the power adjustment parameters to the power supply end of the optical fiber power supply system so that the power supply end can increase the optical power of the laser transmitted through the optical fiber according to the power adjustment parameters.

4. The fiber optic power supply system as described in claim 2, characterized in that, The photoelectric conversion module includes a positive output terminal and a negative output terminal, which are used to output 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 Q1, a unidirectional 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 for inputting the 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 is used as the negative output terminal of the second power supply; the controlled switch 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 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 conducting tube D1 is connected to the positive terminal of the controlled switching tube Q1, and the negative terminal of the unidirectional conducting tube D1 is connected to the load, so as to serve 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 conducting transistor D1, and the other end is connected to the negative terminal of the controlled switching transistor Q1.

5. The fiber optic power supply system as described in claim 2, characterized in that, The photoelectric conversion module includes a positive output terminal and a negative output terminal, which are used to output the first power supply; The remote power conversion module includes a Buck converter for converting the first power source into the second power source. The Buck converter includes a controlled switch Q1, a unidirectional conductor 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 for inputting the internal resistance adjustment signal; the controlled switch 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 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 terminal of the unidirectional conduction tube D1. The positive terminal of the unidirectional conduction tube D1 is connected to the negative output terminal of the photoelectric conversion module and is used 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 conductive tube D1, and the other end is used 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 tube D1.

6. The fiber optic power supply system as described in claim 2, characterized in that, The photoelectric conversion module includes a positive output terminal and a negative output terminal, which are used to output the first power supply; The remote power conversion module includes a Buck-Boost converter for converting the first power source into the second power source; The Buck-Boost converter includes a controlled switch Q1, a unidirectional conductor 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 for inputting the internal resistance adjustment signal; the controlled switch 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 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 terminal of the unidirectional conduction tube D1. The positive terminal of the unidirectional conductive tube D1 is used 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 conductive tube D1, and the other end is used 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 conducting tube D1.

7. The optical fiber power supply system as described in any one of claims 4 to 6, characterized in that, The controlled switch Q1 is a MOS switch; the unidirectional conduction transistor D1 is a diode; the internal resistance adjustment signal is a pulse signal with adjustable pulse width. When the internal resistance adjustment signal is high, 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 low, the MOS switch is turned off to disconnect the electrical connection between the positive and negative terminals of the controlled switch Q1.

8. A fiber optic power supply method for measuring instruments, characterized in that, For use in the optical fiber power supply system as described in any one of claims 1 to 7, the optical fiber power supply method comprises: Obtain the current-voltage curve and power-voltage curve from the power conversion parameters of the photoelectric conversion module; The maximum power point and the specific stable region of low resistance state are obtained based on the current-voltage curve and the power-voltage curve; wherein, the specific stable region of low resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the slope of the tangent line of the point on the power-voltage curve corresponding to any point on the segment is less than 0. Obtain the 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 start-up voltage value Vset, by adjusting the electrical parameters of the second power supply, the value of the equivalent resistance of the external load of the photoelectric conversion module is controlled to be not less than the value of the internal impedance of the current photoelectric conversion module, thereby making the output power of the photoelectric conversion module maintain within a specific stable region of maximum power point and low resistance state; wherein, the start-up 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 that can be executed by a processor to implement the optical fiber power supply method as described in claim 8.

10. A light energy conversion power supply, characterized in that, It 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 laser light transmitted through optical fiber via a photoelectric converter and convert the light energy 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 according to a preset power supply parameter, and use the second power source as the working power source output by the light energy conversion power source. 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 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. The optical power transmission control module is used to control the output power of the photoelectric conversion module to remain within a specific stable region between the maximum power point and the low resistance state by adjusting the electrical parameters of the second power source when the operating voltage V1 of the first power source is not less than the start-up voltage value Vset. The specific stable region of the low resistance state is a segment of the current-voltage curve in the power conversion parameters of the photoelectric conversion module, and the slope of the tangent line at any point on the power-voltage curve corresponding to any point on this segment is less than 0. The start-up voltage value Vset is a preset minimum voltage value of the second power source output by the remote power conversion module.

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