Optical isolation light-emitting side compensation device and optical isolation double-compensation system

Abstract

The invention relates to an optical isolation light-emitting side compensation device and an optical isolation double-compensation system. The optical isolation double-compensation system comprises a photosensitive side compensation device, a light-emitting side processing device and an optical isolation light-emitting side compensation device. The photosensitive side compensation device collects an electric output signal, analyzes the electric output signal to generate a first analysis signal and sends the first analysis signal to the light-emitting side processing device, and the light-emitting side processing device collects an electric input signal and generates a second analysis signal according to the electric input signal. And the processor is also used for calculating a bias signal and a gain signal according to the first analytic signal and the second analytic signal as an adjustment basis of the optical isolation light-emitting side compensation device. Through voltage change on the photosensitive side and synchronous gain and offset adjustment on the light-emitting side, changes caused by temperature characteristics are corrected, and errors of the light-emitting side and the photosensitive side are eliminated.

Description

Technical Field

[0001] The present invention relates to the field of optical isolation information technology, and in particular to an optical isolation light-emitting side compensation device and an optical isolation double compensation system. Background Art

[0002] Optical isolation probes play a key role in many electronic and optical systems. They can achieve effective signal isolation and transmission, ensuring that different circuit modules can transmit signals while avoiding electrical interference and other problems. They are commonly found in communication systems, high-precision measuring instruments, and some industrial control scenarios that have strict requirements for signal isolation.

[0003] Optical isolation probes usually use light-emitting diodes or lasers as light sources. When a forward bias current is applied to the light-emitting diode or laser, electrons and holes will recombine in the semiconductor material inside it, thereby releasing photons, generating light radiation, and emitting light with a certain wavelength and intensity, thereby realizing its function through processes such as optical transmission, isolation, and photoelectric conversion.

[0004] However, in the process of converting electrical signals into optical signals, diodes or lasers are not stable. When a constant current is input into the laser emitting tube, the output laser intensity will also change with the ambient temperature. At the same time, due to the decay of the material, the conversion efficiency will gradually decrease with the increase of working time and the light decay of the luminous efficiency. In addition, the threshold current of the laser emitting tube will also change with the ambient temperature, resulting in changes in the accuracy of electrical to optical conversion, thus causing errors. In addition, there may be factors such as optical signal transmission (such as different bending degrees of optical cables), which may also affect the changes in the received light intensity.

[0005] Existing optical isolation compensation adjustment schemes rely on circuit elements such as variable resistors, capacitors, digital positioners, or gain adjustment chips to adjust corresponding parameters. However, the above adjustment methods either have low adjustment accuracy or low adjustment frequency, which cannot meet the complex and changing situations, or have high costs or bandwidths that cannot meet actual needs. Summary of the invention

[0006] In view of the above analysis, the embodiments of the present invention aim to provide an optically isolated light-emitting side compensation device and an optically isolated dual compensation system, so as to solve the problem that the threshold current of the laser emitting tube will change with the ambient temperature, and the luminous efficiency and light decay in the prior art will cause the accuracy of electric-to-light conversion to change, thereby causing errors.

[0007] On one hand, the present application provides a light-isolated light-emitting side compensation device, comprising: A signal input module, used for inputting an electrical input signal and outputting a first reference signal according to the electrical input signal; An offset compensation module, configured to input an offset signal and superimpose the offset signal on the first reference signal to form a first operation signal; A gain compensation module, configured to input a gain signal, output a first light control signal according to the gain signal, and convert the first light control signal into a gain second operation signal; The superposition control module is used to perform superposition operation on the first operation signal and the second operation signal, and output a second laser control signal according to the operation result to control the laser emitting tube to generate a light source.

[0008] As one of the optional embodiments, the signal input module includes: a first resistor connected to the electrical input signal input terminal; The other end of the first resistor is respectively connected to an input end of the superposition control module and one end of a grounded second resistor.

[0009] As one of the optional embodiments, the gain compensation module includes a first operational amplifier and an optical coupler isolator, wherein: The input gain signal is connected to the non-inverting input terminal of the first operational amplifier via an impedance matching resistor; The output end of the first operational amplifier is connected to the anode of the light-emitting device inside the optocoupler isolator through a current-limiting resistor to form a current driving channel; The cathode of the light emitting device is feedback-connected to the inverting input terminal of the first operational amplifier to form a closed loop, and the cathode of the light emitting device is connected to a grounding resistor; A capacitor is provided in parallel with the output terminal and the inverting input terminal of the first operational amplifier for filtering.

[0010] As one of the optional embodiments, the optical coupler isolator includes a light emitting diode and a photoresistor, and the superposition control module includes a second operational amplifier and a laser, wherein: The output end of the second operational amplifier is connected to one end of the laser, and the other end of the laser is feedback-connected to the inverting input end of the second operational amplifier to form a closed loop; One end of the photoresistor is grounded, and the other end is connected to the inverting input end of the second operational amplifier, so as to generate a gain signal according to the light emission of the light-emitting diode to control the gain of the second operational amplifier.

[0011] As one of the optional embodiments, the optical isolation light-emitting side compensation device further includes a first PI control module and a second PI control module, wherein: The first PI control module is used to generate a gain compensation signal according to the peak error between the photosensitive side output signal and the electrical input signal, and input the gain compensation signal to the gain compensation module; The second PI control module is used to generate a bias compensation signal according to the error or mean error between the preset sampling time of the photosensitive side output signal and the electrical input signal, and input it into the bias compensation module.

[0012] A second aspect of the present application provides an optical isolation dual compensation system, comprising: A photosensitive side compensation device, used for collecting the electrical output signal, analyzing the electrical output signal to generate a first analysis signal, and sending the first analysis signal to the light-emitting side processing device; A light-emitting side processing device, used to collect an electrical input signal and generate a second analytical signal according to the electrical input signal, and also used to receive the first analytical signal, and calculate a bias signal and a gain signal according to the first analytical signal and the second analytical signal; The optically isolated light-emitting side compensation device described in any of the above embodiments.

[0013] Furthermore, the system further comprises: A signal acquisition unit, used for acquiring electrical output signals and electrical input signals; A signal analysis and processing unit, used for analyzing the electrical output signal / electrical input signal; A data sending unit, used for sending the first and second parsing signals to the light-emitting side processing device; A signal processing unit is used to calculate a bias signal and a gain signal according to the first analytical signal and the second analytical signal.

[0014] A third aspect of the present application provides an optical isolation compensation processing method for use in any of the above-mentioned systems, the method comprising: Control the system to collect the photosensitive side output signal and the light-emitting side electrical input signal respectively at a first frequency; Analyze the collected photosensitive side output signal and light-emitting side electrical input signal; Calculate the peak error of the analyzed output signal and the electrical input signal and the real-time error or the error mean within a preset period; A gain compensation signal and a bias compensation signal are generated according to the peak error and the real-time error or the error mean within a preset period, so that the photosensitive side output signal and the light-emitting side electrical input signal are equal.

[0015] Preferably, the method further comprises: If the error is less than / greater than a preset value and lasts for a preset number of sampling cycles, controlling the system to collect the sensitive-side output signal and the light-emitting-side electrical input signal at a second frequency; The second frequency is less than / greater than the first sampling frequency.

[0016] The optically isolated light-emitting side compensation device of the embodiment of the present application includes a signal input module that outputs a first reference signal according to an electrical input signal, a bias compensation module that superimposes a bias signal on the first reference signal to form a first operation signal, a gain compensation module that outputs a second operation signal according to a gain signal, and a superposition control module for operating the first operation signal and the second operation signal to output a laser control signal according to the operation result. The above scheme of the present application adjusts the signal output of the superposition control module through the bias compensation module and the gain compensation module, thereby changing the output of the photosensitive side, correcting the changes caused by the temperature characteristics according to the light-emitting adjustment, eliminating the errors on the light-emitting side and the photosensitive side, and providing a hardware foundation for the bias and gain adjustment of the laser emitting tube on the light-emitting side. Moreover, the scheme of the present application not only has high adjustment accuracy or adjustment frequency, which can better meet complex and changeable situations, but also the required cost or bandwidth can better meet actual needs.

[0017] Furthermore, the scheme of the present application changes the illumination of the light-emitting device of the optocoupler isolator through the control of the gain compensation signal, thereby continuously changing the resistance value of the photosensitive coupling resistor. This continuously variable characteristic enables the gain of the operational amplifier to be continuously and delicately adjusted, and can achieve a more accurate gain value setting, meet the application scenarios with high-precision requirements for signal amplification factors, can more accurately control the amplification factor, and reduce signal distortion caused by gain errors. At the same time, within a certain voltage control range, through the circuit designed in this application, the gain change of the operational amplifier can also present a more ideal linear range, and the gain can be accurately adjusted according to specific input and output requirements, so as to achieve the expected signal amplification ratio, and is conducive to accurately grasping the relationship between the gain change and the output signal. In addition, the above-mentioned gain compensation signal of the above-mentioned scheme of the present application is transmitted by light, and electrical isolation is achieved, which can effectively prevent electrical interference (such as electromagnetic noise, power supply fluctuations, etc.) in the input side circuit from being transmitted to the output side circuit where the operational amplifier is located, thereby improving the anti-interference ability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A module structure diagram of an optical isolation light-emitting side compensation device in one embodiment; Figure 2 A schematic diagram of the operation of an optical isolation probe in one embodiment; Figure 3 A circuit diagram of an optically isolated light-emitting side compensation device in one embodiment; Figure 4 A module structure diagram of an optical isolation double compensation system in one embodiment; Figure 5 FIG. 4 is a waveform diagram of a signal compensation adjustment result in one embodiment. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] In order to keep the following description of the embodiments of the present application clear and concise, the present application omits detailed descriptions of some known functions and known components.

[0022] Figure 1 Schematic diagram of the module structure of the optical isolation light-emitting side compensation device of an application embodiment, as shown in FIG. Figure 1 As shown, a light-isolated light-emitting side compensation device of an application embodiment includes: The signal input module 100 is used to input an electrical input signal V-in and output a first reference signal according to the electrical input signal V-in; The bias compensation module 101 is used for inputting a bias signal Vbias and superimposing the bias signal Vbias on the first reference signal to form a first operation signal V1; The gain compensation module 102 is used for inputting a gain signal Vdac, and outputting a second operation signal V2 and an optocoupler isolator control signal V3 according to the gain signal Vdac; A superposition control module 103, used for calculating the first calculation signal V1 and the second calculation signal V2, and outputting a second laser control signal V4 according to the calculation result; The optocoupler isolator control signal V3 is used to be applied to the light-emitting device of the optocoupler isolator to generate light, and then generate a gain control signal through optical coupling, and the second laser control signal V4 is used to be applied to the positive electrode of the laser emitting tube.

[0023] Figure 2 This is a working diagram of the optical isolation probe. Figure 2 As shown in the figure, the optical isolation probe includes two working modules: the light-emitting side and the photosensitive side. The light-emitting side includes an electrical input signal input link and an intermediate link that converts the electrical input signal into an optical signal through a laser transmitting tube. The photosensitive side uses a photodiode to convert the optical signal into an electrical signal module; the optical signal is transmitted from the light-emitting side to the photosensitive side through optical fiber transmission, directly transmitting the analog signal, thereby achieving electrical isolation.

[0024] The optically isolated light-emitting side compensation device of the embodiment of the present application is arranged on the light-emitting side, and is used to perform gain adjustment and bias adjustment on the diode on the light-emitting side.

[0025] As one of the optional embodiments, Figure 3 : is a circuit diagram of an optical isolation light-emitting side compensation device according to an embodiment of the application, such as Figure 3 As shown, the signal input module includes: A first resistor R1 connected to the electrical input signal input terminal; The other end of the first resistor is respectively connected to an input end of the superposition control module and one end of a grounded second resistor R2 for outputting a first reference signal.

[0026] The bias compensation module includes: a fourth resistor R4 connected to the bias signal input terminal; A DC voltage source VCC and a fifth resistor R5 connected to the voltage source VCC; The other end of the fourth resistor R4 and the other end of the fifth resistor R5 are commonly connected to one end of the third resistor R3, and the other end of the third resistor R3 is respectively connected to an input end of the superposition control module and one end of the grounded second resistor R2 to superimpose the bias signal on the first reference signal.

[0027] The gain compensation module includes a first operational amplifier U1 and an optical coupler isolator U3, wherein: The input gain signal is connected to the non-inverting input terminal of the first operational amplifier U1 through the impedance matching resistor R6; the output terminal of the first operational amplifier U1 is connected to the anode of the light-emitting device inside the optical coupler isolator U3 through the current limiting resistor R7 to form a current driving channel; the cathode of the light-emitting device is feedback-connected to the inverting input terminal of the first operational amplifier U1 to form a closed loop, and the cathode of the light-emitting device is connected to the grounding resistor R8; Furthermore, a parallel capacitor C1 is provided between the output terminal and the inverting input terminal of the first operational amplifier U1 for filtering, so that the parallel capacitor C1 and the grounding resistor R8 form an RC filtering circuit.

[0028] Preferably, the optical coupler isolator includes a light emitting diode and a photoresistor, and the superposition control module includes a second operational amplifier U2 and a laser, wherein: The output end of the second operational amplifier is connected to one end of the laser, and the other end of the laser is feedback-connected to the inverting input end of the second operational amplifier to form a closed loop; One end of the photoresistor is grounded, and the other end is connected to the inverting input end of the second operational amplifier and the cathode of the laser transmitting tube, so as to generate a gain control signal to control the gain of the second operational amplifier according to the change in resistance value caused by the light emitting diode. The photoresistor is connected in parallel with a tenth resistor R10 and a ninth resistor R9 to reduce the influence of parasitic capacitance on high-frequency transmission and ensure the stability and accuracy of gain adjustment and bias adjustment.

[0029] The above-mentioned embodiment scheme of the present application changes the illumination of the light-emitting device of the optocoupler isolator through the control of the gain compensation signal, thereby continuously changing the resistance value of the photosensitive coupling resistor. This continuously variable characteristic enables the gain of the operational amplifier to be continuously and delicately adjusted, and can achieve a more accurate gain value setting, meet the application scenarios with high-precision requirements for the signal amplification factor, can more accurately control the amplification factor, and reduce the signal distortion caused by the gain error. At the same time, within a certain voltage control range, through the circuit designed in this application, the gain change of the operational amplifier can also present a more ideal linear range, and the gain can be accurately adjusted according to the specific input and output requirements, so as to facilitate the realization of the expected signal amplification ratio, and is conducive to accurately grasping the relationship between the gain change and the output signal. In addition, the above-mentioned gain compensation signal of the above-mentioned scheme of the present application is transmitted by light, and electrical isolation is achieved, which can effectively prevent the electrical interference (such as electromagnetic noise, power supply fluctuations, etc.) in the input side circuit from being transmitted to the output side circuit where the operational amplifier is located, thereby improving the anti-interference ability of the circuit.

[0030] Preferably, the superposition control module includes: a second operational amplifier U2 whose non-phase input terminal is used to access the first operational signal, and whose inverting input terminal is used to access the second operational signal; the output terminal of the second operational amplifier is connected to a current limiting resistor R11, and the other end of the resistor R11 is connected to a laser to output a laser control signal.

[0031] The optical isolation light-emitting side compensation device circuit of the embodiment of the present application serves as the hardware basis for gain adjustment and bias adjustment.

[0032] The optically isolated light-emitting side compensation device of the embodiment of the present application includes a signal input module that outputs a first reference signal according to an electrical input signal, a bias compensation module that superimposes a bias signal on the first reference signal to form a first operation signal, a gain compensation module that outputs a second operation signal and a first laser control signal according to a gain signal, and a superposition control module that operates the first operation signal and the second operation signal to output a second laser control signal according to the operation result. The first laser control signal is applied to the negative electrode of the laser emitting tube, and the second laser control signal is applied to the positive electrode of the laser emitting tube. It provides a hardware basis for the bias and gain adjustment of the laser emitting tube on the light-emitting side, corrects the changes caused by the temperature characteristics according to the light-emitting adjustment, and eliminates the errors on the light-emitting side and the photosensitive side.

[0033] Based on the optically isolated light-emitting side compensation device, an embodiment of the present application also provides an optically isolated dual compensation system. Figure 4 The module structure diagram of the optical isolation dual compensation system of an application embodiment is as follows: Figure 4 As shown, an optical isolation dual compensation system of an embodiment of the application includes: The photosensitive side compensation device 200 is used to collect the electrical output signal, analyze the electrical output signal to generate a first analysis signal, and send the first analysis signal to the light-emitting side processing device 201; The light-emitting side processing device 201 is used to collect the electrical input signal and generate a second analytical signal according to the electrical input signal, and is also used to receive the first analytical signal and calculate a bias signal and a gain signal according to the first analytical signal and the second analytical signal; The optically isolated light-emitting side compensation device 202 of any of the above embodiments.

[0034] The sampled input voltage X of the electrical input signal is converted into the output voltage Y corresponding to the superposition control module 103 through a series of operation circuits, and the functional relationship is analogous to Y=A(aX+bB+c). Figure 1 In which, X is the electrical input signal V-in, B is the parameter controlled by the bias signal Vbias, A is the gain adjustment parameter controlled by the gain signal Vdac, a, b, c are coefficients related to the corresponding resistance and DC voltage, and Y is the electrical output signal of 103.

[0035] The gain changes the brightness by changing the current of the laser emitting tube, and then changes the resistance of the photoresistor to change the gain A, while the bias changes by changing the output voltage B. The gain and offset are changed by the ratio between the average value and peak-to-peak value calculated in real time to ensure that the signals at both ends remain highly consistent.

[0036] The signals on the light-emitting side and the photosensitive side need to be accurately restored 1:1. In the process of converting electrical signals into optical signals, the laser emitting tube is not stable. When current is input into the laser emitting tube, the output laser intensity will change with the ambient temperature. At the same time, the material will decay, resulting in a gradual decrease in conversion efficiency as the working time increases, which will affect the light intensity reaching the photosensitive side. Finally, A and B change.

[0037] In physics, B mainly represents the threshold current of the laser, which changes with the ambient temperature. A represents the photoelectric conversion efficiency or coefficient of the laser, which mainly includes the luminous efficiency: it changes with temperature and decays with working years; the transmission efficiency of light, which decays during transmission in the optical fiber.

[0038] The relationship between the laser's luminous intensity and current is usually nonlinear, and the specific characteristics depend on the type and operating state of the laser.

[0039] Based on this, preferably, the photosensitive side compensation device includes: A first acquisition circuit, used for acquiring an electrical output signal; a first processor for analyzing the electrical output signal to generate a first analyzed signal; The data sending circuit is used to send a first analysis signal to the light-emitting side processing device.

[0040] The light-emitting side processing device includes: A second acquisition circuit, used for acquiring an electrical input signal; A data receiving circuit, used for receiving a first analytical signal sent by the photosensitive side compensation device; The second processor is configured to calculate an offset signal and a gain signal according to the first analytical signal and the second analytical signal.

[0041] Among them, according to the comparison of the first analytical signal and the second analytical signal, the peak-to-peak value of the signal is obtained, and the gain compensation signal is calculated according to the peak-to-peak value; and combined with the time delay compensation (time alignment), the error and average value of each acquisition moment of the first analytical signal and the second analytical signal are compared to calculate the bias compensation signal; and then the input adjustment gain signal and bias signal are input until the electrical input signal and the electrical output signal are consistent. If the electrical input signal is 3Vp-p and the electrical output signal is 2.8Vp-p, the gain signal needs to be increased by 7%.

[0042] Preferably, through PI control, according to the comparison between the first analytical signal and the second analytical signal, the peak-to-peak value of the comparison signal is input into the PI controller to characterize the error between the electrical input signal and the electrical output signal, and the gain signal is output through the PI controller. The gain signal is adjusted until the electrical input signal is equal to the electrical output signal.

[0043] At the same time, through PI control, according to the comparison of the first analytical signal and the second analytical signal, the error and / or the average error of the comparison signal at each moment is input into the PI controller to characterize the error between the electric input signal and the electric output signal, and the bias signal is output through the PI controller. The bias signal is adjusted until the electric input signal is equal to the electric output signal.

[0044] The photosensitive side compensation device transmits the first analysis signal through the optical fiber channel between the light-emitting side and the photosensitive side.

[0045] Analog channel: On the light-emitting side, the electrical input signal controls the laser emitting tube to emit laser through the controller, and the laser is transmitted to the receiver in the optical fiber; in the receiver, the photodiode is irradiated by the laser to generate current, which is converted into an output signal by the converter.

[0046] Digital channel: In the transmitter, the MCU outputs digital signals, the controller controls the laser transceiver to emit laser, and the laser is transmitted to the receiver in the optical fiber; in the receiver, the laser transceiver generates current when irradiated by laser, which is converted into digital signals by the converter and output to the receiver MCU for processing. The receiver MCU also outputs digital signals, the controller controls the laser transceiver to emit laser, and the laser is transmitted to the transmitter in the optical fiber; in the transmitter, the laser transceiver generates current when irradiated by laser, which is converted into digital signals by the converter and output to the transmitter MCU for processing.

[0047] Among them, the digital channels sample conventional wavelength division multiplexing and share a physical optical fiber.

[0048] Based on the hardware foundation of the embodiment of the present application, through the algorithm fitting of the first processor and the second processor, it is possible to change the voltage on the photosensitive side and adjust the gain and offset synchronously on the light-emitting side, correct the changes caused by temperature characteristics, and eliminate the errors on the light-emitting side and the photosensitive side.

[0049] Furthermore, in one embodiment, the present application also provides an optical isolation compensation processing method, which is used in the optical isolation dual compensation system as described in any one of the above items, and the method includes: S1, controlling the system to collect the photosensitive side output signal and the light-emitting side electrical input signal respectively at a first frequency; S2, analyzing the collected photosensitive side output signal and light-emitting side electrical input signal; S3, aligning the collected and analyzed photosensitive side output signal and light-emitting side electrical input signal in time; S4, calculating the peak error of the analyzed output signal and the electrical input signal and the real-time error or the error mean within a preset period; S5. Generate a gain compensation signal and a bias compensation signal according to the peak error and the real-time error or the error mean within a preset period, so that the photosensitive side output signal and the light-emitting side electrical input signal are equal.

[0050] Preferably, the method further comprises: S6. If the error is less than / greater than a preset value and lasts for a preset number of sampling cycles, control the system to collect the sensitive-side output signal and the light-emitting-side electrical input signal at a second frequency; The second frequency is less than / greater than the first sampling frequency.

[0051] In one embodiment, the results before and after the adjustment of the sinusoidal input signal wave by the above scheme of the present application are as follows: Figure 5 As shown, it can be seen from the results that before adjustment, the peak value and partial waveform value of the output waveform are somewhat different from the input. The present application obtains the error of the corresponding signal by comparing and calculating the input waveform and each output sampling signal, and then controls the gain compensation module and the bias compensation module to output the compensation adjustment signal through the PI controller, so that the output side signal can be quickly made equal to the input signal, and the present application has a higher adjustment frequency and accuracy.

[0052] It should be noted that the hardware basis provided by the embodiment of the present application, the algorithm is limited and calibrated with a voltage function relationship, and the algorithm can be adjusted according to the hardware characteristics of the light-emitting side, which is not within the scope of protection of the present application.

[0053] There are a few points to note about this application: (1) The drawings of the embodiments of the present application only relate to the structures related to the embodiments of the present application, and other structures may refer to the general design.

[0054] (2) For the sake of clarity, the thickness and size of layers or structures are exaggerated in the drawings used to describe the embodiments of the present invention. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element, or there may be intervening elements.

[0055] (3) In the absence of conflict, the embodiments of the present application and the features in the embodiments may be combined with each other to obtain new embodiments. The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

[0056] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0057] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A light-isolated light-emitting side compensation device, characterized in that: The device comprises: A signal input module, used for inputting an electrical input signal and outputting a first reference signal according to the electrical input signal; An offset compensation module, configured to input an offset signal and superimpose the offset signal on the first reference signal to form a first operation signal; A gain compensation module, configured to input a gain signal, output a first light control signal according to the gain signal, and convert the first light control signal into a gain second operation signal; The superposition control module is used to perform superposition operation on the first operation signal and the second operation signal, and output a second laser control signal according to the operation result to control the laser emitting tube to generate a light source.

2. The optical isolation light-emitting side compensation device according to claim 1, characterized in that: The signal input module comprises: A first resistor connected to the electrical input signal input terminal; The other end of the first resistor is respectively connected to an input end of the superposition control module and one end of a grounded second resistor.

3. The optical isolation light-emitting side compensation device according to claim 2, characterized in that: The bias compensation module comprises: a fourth resistor connected to the bias signal input terminal; The other end of the fourth resistor is connected to one end of the third resistor, and the other end of the third resistor is respectively connected to an input end of the superposition control module and one end of the grounded second resistor to superimpose the bias signal on the first reference signal.

4. The optical isolation light-emitting side compensation device according to claim 1, characterized in that: The gain compensation module includes a first operational amplifier and an optical coupler isolator, wherein: The input gain signal is connected to the non-inverting input terminal of the first operational amplifier via an impedance matching resistor; The output end of the first operational amplifier is connected to the anode of the light-emitting device inside the optocoupler isolator through a current-limiting resistor to form a current driving channel; The cathode of the light emitting device is feedback-connected to the inverting input terminal of the first operational amplifier to form a closed loop, and the cathode of the light emitting device is connected to a grounding resistor; A capacitor is provided in parallel with the output terminal and the inverting input terminal of the first operational amplifier for filtering.

5. The optical isolation light-emitting side compensation device according to claim 4, characterized in that: The optical coupler isolator includes a light emitting diode and a photoresistor, and the superposition control module includes a second operational amplifier and a laser, wherein: The output end of the second operational amplifier is connected to one end of the laser, and the other end of the laser is feedback-connected to the inverting input end of the second operational amplifier to form a closed loop; One end of the photoresistor is grounded, and the other end is connected to the inverting input end of the second operational amplifier, so as to generate a gain signal to control the gain of the second operational amplifier according to the resistance value changed by the light emitting diode.

6. The optical isolation light-emitting side compensation device according to any one of claims 1 to 5, characterized in that: The device further comprises a first PI control module and a second PI control module, wherein: The first PI control module is used to generate a gain compensation signal according to the peak error between the photosensitive side output signal and the electrical input signal, and input the gain compensation signal to the gain compensation module; The second PI control module is used to generate a bias compensation signal according to the error or mean error between the preset sampling time of the photosensitive side output signal and the electrical input signal, and input it into the bias compensation module.

7. An optical isolation double compensation system, characterized in that: include: A photosensitive side compensation device, used for collecting the electrical output signal, analyzing the electrical output signal to generate a first analysis signal, and sending the first analysis signal to the light-emitting side processing device; A light-emitting side processing device, used to collect an electrical input signal and generate a second analytical signal according to the electrical input signal, and also used to receive the first analytical signal, and calculate a bias signal and a gain signal according to the first analytical signal and the second analytical signal; An optically isolated light-emitting side compensation device as claimed in any one of claims 1 to 6.

8. The optical isolation double compensation system according to claim 7, characterized in that: The system comprises: A signal acquisition unit, used for acquiring electrical output signals and electrical input signals; A signal analysis and processing unit, used for analyzing the electrical output signal / electrical input signal; A data sending unit, used for sending the first and second parsing signals to the light-emitting side processing device; A signal processing unit is used to calculate a bias signal and a gain signal according to the first analytical signal and the second analytical signal.

9. A method for optical isolation compensation processing, used in the system according to any one of claims 7 to 8, characterized in that: The method comprises: Control the system to collect the photosensitive side output signal and the light-emitting side electrical input signal respectively at a first frequency; Analyze the collected photosensitive side output signal and light-emitting side electrical input signal; Calculate the peak error of the analyzed output signal and the electrical input signal and the real-time error or the error mean within a preset period; A gain compensation signal and a bias compensation signal are generated according to the peak error and the real-time error or the error mean within a preset period, so that the photosensitive side output signal and the light-emitting side electrical input signal are equal.

10. The method according to claim 9, characterized in that The method further comprises: If the error is less than / greater than a preset value and lasts for a preset number of sampling cycles, controlling the system to collect the sensitive-side output signal and the light-emitting-side electrical input signal at a second frequency; The second frequency is smaller than / greater than the first frequency.

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