An electro-optical conversion circuit, an optical communication system and an LED luminaire

Abstract

An electro-optical conversion circuit, an optical communication system and an LED lamp are connected with an input end of an optical fiber, and the working state of a device to be monitored is sensed by an inductive inductor to output an induction signal; a control circuit outputs a direct current voltage signal based on the induction signal, and the direct current voltage signal carries the working state information of the device to be monitored; a voltage-current conversion circuit converts the direct current voltage signal into a first current signal and a second current signal; and a light-emitting circuit emits light according to the first current signal to output an optical signal to the optical fiber. Since the analog electric signal of the inductive circuit is converted into the optical signal, and the optical signal is transmitted through the connected optical fiber, the transmission rate and transmission efficiency of the electric signal are greatly improved, and the big data management and analysis of intelligent lighting are facilitated.

Description

Technical Field

[0001] This application belongs to the field of optical communication technology, and in particular relates to an electro-optical conversion circuit, an optical communication system, and an LED lamp. Background Technology

[0002] Currently, decentralized lighting systems are gradually failing to meet people's needs. 4G and 5G smart lighting will display the working status of every lighting device and even every LED chip, allowing people to plan and arrange lighting layouts in real time based on the working status of the lights to adapt to various complex environments.

[0003] Currently, the operational status data of smart lighting systems needs to be uploaded to the server. This mainly involves collecting various data from lighting fixtures, converting this data into electrical signals, and then uploading these signals to the server via wireless transmission or ordinary cable transmission. When the number of data types and the data volume are small, the transmission rate and efficiency can be guaranteed. However, as the number of smart lighting fixtures increases, the types of operational status data to be collected also increase, and both the data types and the data volume become particularly large. In this case, wireless transmission or ordinary cable transmission can no longer adequately guarantee transmission efficiency and speed.

[0004] Therefore, traditional technical solutions suffer from low transmission rates and efficiency in transmitting electrical signals when the data volume is large. Summary of the Invention

[0005] The purpose of this application is to provide an electro-optical conversion circuit, which aims to solve the problem of low data transmission rate and efficiency of electrical signals when uploading the working status data of traditional LED lamps to the server.

[0006] A first aspect of this application provides an electro-optical conversion circuit connected to the input end of an optical fiber, comprising:

[0007] The sensing circuit is configured to sense the operating status of the device under monitoring and output a sensing signal.

[0008] A control circuit, connected to the sensing circuit, is configured to output a DC voltage signal based on the sensing signal, the DC voltage signal carrying the operating status information of the device to be monitored.

[0009] A voltage-to-current conversion circuit, connected to the control circuit, is configured to convert the DC voltage signal into a first current signal and a second current signal;

[0010] The light-emitting circuit, connected to the voltage-to-current conversion circuit, is configured to emit light according to the first current signal and the second current signal, so as to output an optical signal to the optical fiber.

[0011] In one embodiment, the sensing circuit includes:

[0012] The detection circuit is configured to detect the operating status of the device to be monitored and output an analog detection signal.

[0013] An analog-to-digital converter circuit, connected to the detection circuit and the control circuit, is configured to convert the analog detection signal into an inductive signal.

[0014] In one embodiment, it further includes:

[0015] A current coupling circuit, connected to the voltage-to-current conversion circuit and the light-emitting circuit, is configured to couple the first current signal and the second current signal to output a variable current signal;

[0016] The light-emitting circuit is specifically configured to emit light according to the first current signal, the second current signal, and the variable current signal, so as to output an optical signal to the optical fiber.

[0017] In one embodiment, the voltage-to-current conversion circuit includes an amplifier, a first transistor, a second transistor, a first capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein the first transistor is a PNP transistor and the second transistor is an NPN transistor.

[0018] The non-inverting input terminal and the inverting input terminal of the amplifier are both used as the DC voltage signal input terminal of the voltage-current conversion circuit, and are connected to the control circuit to receive the DC voltage signal.

[0019] The positive output terminal of the amplifier is connected to the base of the first transistor, and the negative output terminal of the amplifier is connected to the first terminal of the first resistor.

[0020] The collector of the first transistor is connected to the first end of the second resistor, and the second end of the second resistor and the first power supply serve as the first current signal output terminal of the voltage-current conversion circuit, which is connected to the light-emitting circuit to output the first current signal.

[0021] The emitter of the first transistor is connected to the first terminal of the first capacitor;

[0022] The second end of the first resistor is connected to the base of the second transistor;

[0023] The emitter of the second transistor is connected to the first terminal of the third resistor;

[0024] The second end of the third resistor serves as the second current signal output terminal of the voltage-current conversion circuit, and is connected to the light-emitting circuit and the current coupling circuit to output the second current signal.

[0025] The collector of the second transistor is connected to the first end of the fourth resistor;

[0026] The second terminal of the first capacitor and the second terminal of the fourth resistor are both connected to the power supply ground.

[0027] In one embodiment, the current coupling circuit includes a fifth resistor, a sixth resistor, a first inductor, and a second capacitor;

[0028] The first end of the first inductor and the first end of the fifth resistor together serve as the input and output terminals of the current coupling circuit, and are connected to the voltage-current conversion circuit to couple the first current signal and the second current signal, and are connected to the light-emitting circuit to output a variable current signal;

[0029] The second terminal of the first inductor is connected to the first terminal of the sixth resistor;

[0030] The second end of the fifth resistor is connected to the first end of the second capacitor;

[0031] The second terminal of the sixth resistor and the second terminal of the second capacitor are both connected to the power supply ground.

[0032] In one embodiment, the control circuitry includes a microprocessor;

[0033] The first input / output terminal of the microprocessor serves as the input terminal of the control circuit and is connected to the sensing circuit to receive the sensing signal;

[0034] The second and third input / output terminals of the microprocessor serve as the output terminals of the control circuit and are connected to the voltage-to-current conversion circuit to output the DC voltage signal.

[0035] In one embodiment,

[0036] The positive voltage differential signal output from the positive output terminal of the amplifier has a voltage range of +1.2V to +2.4V.

[0037] The negative voltage differential signal output from the negative output terminal of the amplifier has a voltage range of -1.2V to -2.4V.

[0038] In one embodiment,

[0039] The amplifier's amplification factor is set to be less than or equal to 5.

[0040] A second aspect of the embodiments of this application provides an optical communication system.

[0041] Includes the electro-optical conversion circuit as described in any one of the first aspects above.

[0042] A third aspect of the embodiments of this application provides an LED lighting fixture.

[0043] Includes the electro-optical conversion circuit as described in any one of the first aspects above.

[0044] The beneficial effects of the embodiments in this application compared with the prior art are:

[0045] By obtaining analog electrical signals from the sensing circuit to monitor the operating status of the device, and then generating DC voltage signals through the control circuit, the voltage-to-current conversion circuit converts the DC voltage signals into current signals. The current signals can output variable current signals according to the input changes of the sensing circuit. The variable current signals are then used to drive the laser diode to emit light pulse signals, thereby converting the electrical signals into optical signals. The optical signals are then output to optical fibers for transmission, which greatly improves the signal transmission rate and efficiency, facilitating big data management and analysis of smart lighting. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of an electro-optic conversion circuit provided in an embodiment of this application;

[0047] Figure 2 This is a schematic diagram of the structure of an induction circuit provided in an embodiment of this application;

[0048] Figure 3 This is a schematic diagram of another structure of the electro-optic conversion circuit provided in one embodiment of this application;

[0049] Figure 4 This is an example circuit diagram of an electro-optic conversion circuit provided in an embodiment of this application. Detailed Implementation

[0050] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0051] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0053] This embodiment provides an electro-optical conversion circuit that connects to the input end of an optical fiber, such as... Figure 1 As shown, for ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0054] The electro-optical conversion circuit includes a sensing circuit 11, a control circuit 12, a voltage-to-current conversion circuit 13, and a light-emitting circuit 14.

[0055] The sensing circuit 11 is configured to sense the working status of the device to be monitored and output a sensing signal.

[0056] The control circuit 12 is connected to the sensing circuit 11 and is configured to output a DC voltage signal based on the sensing signal. The DC voltage signal carries the working status information of the device to be monitored.

[0057] The voltage-to-current conversion circuit 13 is connected to the control circuit 12 and is configured to convert a DC voltage signal into a first current signal and a second current signal.

[0058] The light-emitting circuit 14 is connected to the voltage-to-current conversion circuit 13 and is configured to emit light according to the first current signal and the second current signal, so as to output the optical signal to the optical fiber.

[0059] In practice, the equipment to be monitored includes LED lights. The working status information of the LED lights is transmitted to the optical fiber in the form of light signals through the sensing circuit 11, the control circuit 12, the voltage-current conversion circuit 13, and the light-emitting circuit 14.

[0060] Since the sensing circuit 11, control circuit 12, voltage-current conversion circuit 13 and light-emitting circuit 14 form an electro-optical conversion circuit, the working status information of the LED lamp can be transmitted to the optical fiber in the form of light signals with high accuracy and continuity, which makes it convenient for the managers of the smart lighting system to obtain the real-time working status information of the LED lamp.

[0061] like Figure 2 As shown, the sensing circuit 11 includes a detection circuit 111 and an analog-to-digital conversion circuit 112.

[0062] The detection circuit 111 is configured to detect the operating status of the device under monitoring and output an analog detection signal. The analog-to-digital converter circuit 112 is connected to the detection circuit 111 and the control circuit 12 and is configured to convert the analog detection signal into an inductive signal.

[0063] In practical implementation, the intelligent lighting system includes multiple LED luminaires, each of which comprises multiple LED chips. The operating parameters of each LED luminaire include the voltage, current, power, operating temperature, color temperature, illuminance, brightness, color rendering index, spectrum, and luminous flux of one or more LED chips. Among these, color temperature, illuminance, brightness, color rendering index, spectrum, and luminous flux are optical signal parameters, which are acquired by a detection circuit 111 including an optical signal sensor when the LED luminaire is operating, and an analog detection signal is output. Voltage, current, and power are electrical signal parameters, which are detected by a detection circuit 111 capable of acquiring electrical signals, and an analog detection signal is output. Operating temperature is detected by a detection circuit 111 including a temperature sensor when the LED luminaire is operating, and an analog detection signal is output. An analog-to-digital converter circuit 112 is connected to the detection circuit 111 and the control circuit 12, converting the analog detection signal output by the detection circuit 111 into an inductive signal.

[0064] Since the detection circuit 111 and the analog-to-digital converter circuit 112 can convert the analog detection signal into a digital sensing signal, the accuracy of detecting the working status of the monitored equipment can be improved, which facilitates subsequent signal processing.

[0065] For example, a detection circuit 111, including a temperature sensor, is set up to collect the operating temperature of individual LED beads in an LED lamp. The operating temperature range of the LED beads is 40℃ to 100℃. The detection circuit 111 detects the temperature change of the operating state of the individual LED beads in the LED lamp and outputs an analog detection signal with temperature change information. Then, the analog-to-digital converter circuit 112 converts the analog detection signal with temperature change information output by the detection circuit 111 into a sensing signal with temperature change information.

[0066] It should be noted that individual LED beads have different emission colors. When the number of light-emitting chips in an individual LED bead is less than or equal to 2, the operating voltage range of the individual LED bead is 1.5V to 6.6V. Based on the operating voltage setting range of the individual LED bead, the voltage range of the digital voltage signal is set to 1.5V to 6.6V. The operating parameters of an individual LED bead emitting white light also include: voltage range set to 5.0V to 6.6V, current set to 90mA to 300mA, power set to 1W to 3W, color temperature set to 5200K to 6200K, and luminous flux set to 1200Lm to 1500Lm, with the current preferably set to 150mA.

[0067] like Figure 3 As shown, the electro-optic conversion circuit also includes a current coupling circuit 15.

[0068] The current coupling circuit 15 is connected to the voltage-to-current conversion circuit 13 and the light-emitting circuit 14, and is configured to couple the first current signal and the second current signal to output a variable current signal. The light-emitting circuit 14 is specifically configured to emit light according to the first current signal, the second current signal, and the variable current signal to output an optical signal to the optical fiber.

[0069] In a specific implementation, the current coupling circuit 15 is specifically configured to couple the first current signal and the second current signal flowing through the light-emitting circuit 14, and output a smooth variable current signal to filter out spike signals in the current signal.

[0070] Because the current coupling circuit 15 filters out the spike signals in the current signal, the voltage across the light-emitting circuit 14 is stable, which improves the stability of the amplitude of the operating voltage of the light-emitting circuit and prevents the light-emitting device of the light-emitting circuit 14 from being damaged by the spike signals.

[0071] like Figure 4 As shown, the control circuit 12 includes a microprocessor U1. The first input / output terminal P1.0 of the microprocessor U1 serves as the input terminal of the control circuit 12 and is connected to the sensing circuit 11 to receive the sensing signal. The second input / output terminal P1.1 and the third input / output terminal P1.2 of the microprocessor U1 serve as the output terminals of the control circuit 12 and are connected to the voltage-to-current conversion circuit 13 to output a DC voltage signal.

[0072] The microprocessor U1 is specifically configured to receive digital sensing signals, analyze and process these signals, and convert them into a stable and accurate DC voltage signal. This DC voltage signal reflects the actual operating status of the monitored device. In one embodiment, based on the operating temperature range of a single LED bead, the control circuit 12 outputs a DC voltage signal for the current single LED bead ranging from 0.2V to 1.0V, and this DC voltage signal reflects the current operating status of the LED bead.

[0073] like Figure 4 As shown, the voltage-to-current conversion circuit 13 includes an amplifier U2, a first transistor Q1, a second transistor Q2, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. In this embodiment, the first transistor Q1 is an NPN transistor, and the second transistor Q2 is a PNP transistor.

[0074] The non-inverting input terminal + and the inverting input terminal - of amplifier U2 serve together as the DC voltage signal input terminals of voltage-to-current conversion circuit 13, connected to control circuit 12 to receive a DC voltage signal; the non-inverting output terminal +OUT of amplifier U2 is connected to the base of first transistor Q1, and the negative output terminal -OUT of amplifier U2 is connected to the first end of first resistor R1; the collector of first transistor Q1 is connected to the first end of second resistor R2, and the second end of second resistor R2 and the first power supply VCC serve as the first current signal output terminal of voltage-to-current conversion circuit 13, connected to light-emitting circuit 14. The first transistor Q1 is connected to the first terminal of the first capacitor C1; the second terminal of the first resistor R1 is connected to the base of the second transistor Q2; the emitter of the second transistor Q2 is connected to the first terminal of the third resistor R3; the second terminal of the third resistor R3 serves as the second current signal output terminal of the voltage-to-current conversion circuit 13, and is connected to the light-emitting circuit 14 and the current coupling circuit 15 to output the second current signal; the collector of the second transistor Q2 is connected to the first terminal of the fourth resistor R4; the second terminals of the first capacitor C1 and the second terminal of the fourth resistor R4 are both connected to the power supply ground.

[0075] The voltage-to-current conversion circuit 13 converts the DC voltage signal into a first current signal and a second current signal. It mainly uses amplifier U2 to amplify the DC voltage signal and convert it into a voltage differential signal with opposite polarities. The positive output terminal +OUT of amplifier U2 outputs a positive voltage differential signal, and the negative output terminal -OUT of amplifier U2 outputs a negative voltage differential signal. The voltage of the amplified positive voltage differential signal causes the first transistor Q1 to work in the amplification region, thereby converting the positive voltage differential signal into a first current signal. The variable voltage of the amplified negative voltage differential signal controls the conduction degree of the second transistor Q2, converting the negative voltage differential signal into a second current signal.

[0076] More specifically, the second terminal of the first capacitor C1 is connected to the power supply ground. The first capacitor C1 filters and reduces noise in the amplified signal of the amplifier U2, so that the DC voltage signal data after the amplifier has high fidelity. At the same time, the second terminal of the first capacitor C1 is connected to the power supply ground so that the voltage between the base and emitter of the first transistor Q1 reaches the turn-on voltage of the first transistor Q1, thereby making the first transistor Q1 work in the amplification region.

[0077] More specifically, the second resistor R2 is connected between the first power supply VCC and the collector of the first transistor Q1. The first power supply VCC is a constant voltage and constant current power supply. The amplified variable differential first current signal is shunted by the second resistor R2 to shunt the constant current provided by the first power supply VCC, so that the second terminal of the first power supply VCC and the second resistor R2 are connected as the first current signal output terminal of the voltage-current conversion circuit 13 to output a variable first current signal.

[0078] It should be noted that in this embodiment, the voltage range of the positive differential signal output from the non-inverting output terminal +OUT of amplifier U2 is set to +1.2V to +2.4V, so that the voltage between the base and emitter of the first transistor Q1 reaches the turn-on voltage of the first transistor Q1, thus forward-biasing the base and emitter of the first transistor Q1. Furthermore, by appropriately selecting the values ​​of the first power supply VCC and the second resistor R2, the collector and base of the first transistor Q1 are reverse-biased, thereby enabling the first transistor to... Q1 operates normally in the amplification region; the negative voltage differential signal output from the negative phase output terminal -OUT of amplifier U2 is set to a range of -1.2V to -2.4V, and the value of the third resistor R3 is appropriately selected so that the voltage between the emitter and base of the second transistor Q2 reaches the turn-on voltage of the second transistor Q2, making the emitter and base of the second transistor Q2 forward biased, and the base and collector of the second transistor Q2 reverse biased, thereby making the second transistor Q2 operate in the amplification region.

[0079] Furthermore, the resistance value of the second resistor R2 is set to be equal to the resistance value of the third resistor R3. After the resistance value of the third resistor R3 is set, the magnitude of the current flowing through the third resistor R3 is determined by the voltage after passing through the laser diode LD. At the same time, the resistance value of the third resistor R3 is set so that the voltage at the first terminal of the third resistor R3 connected to the emitter of the second transistor Q2 is higher than the voltage at the base of the second transistor Q2, so that the voltage between the base and emitter of the second transistor Q2 reaches the turn-on voltage of the second transistor Q2, thereby enabling the second transistor Q2 to operate in the amplification region. Meanwhile, the first resistor R1 is connected between the negative output terminal -OUT of amplifier U2 and the base of the second transistor Q2, which can pull up the voltage of the negative voltage differential signal, so that the base and collector of the second transistor Q2 are reverse biased. The first end of the fourth resistor R4 is connected to the collector of the second transistor Q2, and the second end of the fourth resistor R4 is connected to the power supply ground. The main function of the fourth resistor R4 is to pull down to the power supply ground, so as to ensure that the second transistor Q2 is not affected by the changes of the front-end signal and can maintain normal operation.

[0080] Optionally, the amplification factor of amplifier U2 is set to be less than or equal to 5 times, preferably 3 times. For example, the voltage range of the DC voltage signal described above, 0.2V to 1.0V, is amplified to 0.6V to 3.0V.

[0081] like Figure 4 As shown, the light-emitting circuit 14 includes a laser diode LD.

[0082] like Figure 4 As shown, the current coupling circuit 15 includes a fifth resistor R5, a sixth resistor R6, a first inductor L1, and a second capacitor C2.

[0083] The first end of the first inductor L1 and the first end of the fifth resistor R5 together serve as the input and output terminals of the current coupling circuit 15, which is connected to the voltage-to-current conversion circuit 13 to couple the first current signal and the second current signal, and is connected to the light-emitting circuit 14 to output a variable current signal; the second end of the first inductor L1 is connected to the first end of the sixth resistor R6; the second end of the fifth resistor R5 is connected to the first end of the second capacitor C2; the second end of the sixth resistor R6 and the second end of the second capacitor C2 are connected to the power supply ground.

[0084] The current coupling circuit 15 mainly filters and absorbs the spike signal of the first current signal flowing through the laser diode LD through the first inductor L1 and the second capacitor C2, so as to keep the voltage across the laser diode LD stable, obtain a smooth first current signal, prevent the laser diode LD from being damaged by the spike signal, and extend the service life of the laser diode LD.

[0085] More specifically, the third resistor R3, the fifth resistor R5, and the sixth resistor R6 form a small proportional circuit, with the resistance of the fifth resistor R5 set to twice the resistance of the third resistor R3.

[0086] More specifically, the second capacitor C2 is pulled down to ground to filter and absorb the spike signals of the induced current and the first current signal generated by the first inductor L1, thereby further maintaining a stable voltage across the laser diode LD.

[0087] The beneficial effects of the embodiments in this application compared with the prior art are:

[0088] By obtaining analog electrical signals from the sensing circuit based on the operating status of the monitored equipment, and then generating DC voltage signals through the control circuit, the voltage-to-current conversion circuit converts the DC voltage signals into current signals. The current signals can output variable current signals according to the input changes of the sensing circuit. The variable current signals are then used to drive the laser diode to emit light pulse signals, thereby converting the electrical signals into optical signals. The optical signals are then output to optical fibers for transmission, which greatly improves the signal transmission rate and efficiency, facilitating big data management and analysis of smart lighting.

[0089] The following is based on the working principle diagram. Figure 4 The following section provides further explanation:

[0090] The detection circuit 111 detects the operating status of the LED4 beads in the LED lamp and outputs an analog detection signal. The analog-to-digital converter 112 receives the analog detection signal and converts it into a digital sensing signal to output a digital sensing signal. The first input / output terminal P1.0 of the microprocessor U1 receives the digital sensing signal, the second input / output terminal P1.1 of the microprocessor U1 is connected to the negative input terminal - of the amplifier U2 to output a first DC voltage signal, and the third input / output terminal P1.2 of the microprocessor U1 is connected to the positive input terminal + of the amplifier U2 to output a second DC voltage signal. The amplifier U2 converts the DC voltage... The signal is converted into a voltage differential signal with opposite polarity. The positive output terminal +OUT of amplifier U2 outputs a variable positive voltage differential signal, and the negative output terminal -OUT of amplifier U2 outputs a variable negative voltage differential signal. The positive voltage differential signal turns on the first transistor Q1 to output an amplified differential first current signal. The amplified variable differential first current signal is shunted by the second resistor R2 to the constant current provided by the first power supply VCC. The variable first current signal, after being coupled with the constant current provided by the first power supply VCC, flows through the laser diode LD to emit light and send an optical signal to the optical fiber.

[0091] The variable first current signal from the laser diode LD flows through node A. Part of the current flows through the third resistor R3 into the emitter of the second transistor Q2, turning on Q2. The current then flows through the collector of Q2 and the fourth resistor R4 to ground, forming a loop. It also flows through the base of Q2 and the first resistor R1 back to the negative output terminal -OUT of amplifier U2, forming another loop. Another part of the current couples with the induced current generated by the first inductor L1. This coupled current flows through the fifth resistor R5 and is absorbed by the grounded second capacitor C2. Part of the induced current generated by the first inductor L1 flows into the ground through the grounded sixth resistor R6, forming a loop. The values ​​of all components in the electro-optic conversion circuit must satisfy the above operating principle.

[0092] The second aspect of this embodiment provides an optical communication system, including an electro-optical conversion circuit as described in any one of the first aspects.

[0093] A third aspect of this application provides an LED lighting fixture, including an electro-optical conversion circuit as described in any one of the first aspects.

[0094] Fiber optic transmission boasts advantages such as high sensitivity, high bandwidth, large communication capacity, low attenuation, and long transmission distance. It can fully meet the communication and transmission needs of massive amounts of information data from lighting fixtures in smart lighting systems, facilitating big data management and analysis in smart lighting.

[0095] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0096] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An electro-optic conversion circuit, connected to the input end of an optical fiber, characterized in that, include: The sensing circuit is configured to sense the operating status of the device under monitoring and output a sensing signal. A control circuit, connected to the sensing circuit, is configured to output a DC voltage signal based on the sensing signal, the DC voltage signal carrying the operating status information of the device to be monitored. A voltage-to-current conversion circuit, connected to the control circuit, is configured to convert the DC voltage signal into a first current signal and a second current signal; The light-emitting circuit is connected to the voltage-to-current conversion circuit and configured to emit light according to the first current signal and the second current signal, so as to output an optical signal to the optical fiber; A current coupling circuit, connected to the voltage-to-current conversion circuit and the light-emitting circuit, is configured to couple the first current signal and the second current signal to output a variable current signal; The light-emitting circuit is specifically configured to emit light according to the first current signal, the second current signal, and the variable current signal, so as to output an optical signal to the optical fiber; The voltage-to-current conversion circuit includes an amplifier, a first transistor, a second transistor, a first capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein the first transistor is a PNP transistor and the second transistor is an NPN transistor. The non-inverting and inverting input terminals of the amplifier serve together as the DC voltage signal input terminals of the voltage-to-current conversion circuit, and are connected to the control circuit to receive the DC voltage signal. The amplifier amplifies the DC voltage signal and converts it into a voltage differential signal with opposite polarities. The non-inverting output terminal of the amplifier outputs a positive voltage differential signal, and the inverting output terminal outputs a negative voltage differential signal. The voltage of the amplified positive voltage differential signal causes the first transistor to operate in the amplification region, converting the positive voltage differential signal into a first current signal. The variable voltage of the amplified negative voltage differential signal controls the conduction level of the second transistor, converting the negative voltage differential signal into a second current signal. The positive output terminal of the amplifier is connected to the base of the first transistor, and the negative output terminal of the amplifier is connected to the first terminal of the first resistor. The collector of the first transistor is connected to the first end of the second resistor, and the second end of the second resistor and the first power supply serve as the first current signal output terminal of the voltage-current conversion circuit, which is connected to the light-emitting circuit to output the first current signal. The emitter of the first transistor is connected to the first terminal of the first capacitor; The second end of the first resistor is connected to the base of the second transistor; The emitter of the second transistor is connected to the first terminal of the third resistor; The second end of the third resistor serves as the second current signal output terminal of the voltage-current conversion circuit, and is connected to the light-emitting circuit and the current coupling circuit to output the second current signal. The collector of the second transistor is connected to the first end of the fourth resistor; The second terminal of the first capacitor and the second terminal of the fourth resistor are both connected to the power supply ground.

2. The electro-optic conversion circuit as described in claim 1, characterized in that, The sensing circuit includes: The detection circuit is configured to detect the operating status of the device to be monitored and output an analog detection signal. An analog-to-digital converter circuit, connected to the detection circuit and the control circuit, is configured to convert the analog detection signal into an inductive signal.

3. The electro-optic conversion circuit as described in claim 1, characterized in that, The current coupling circuit includes a fifth resistor, a sixth resistor, a first inductor, and a second capacitor; The first end of the first inductor and the first end of the fifth resistor together serve as the input and output terminals of the current coupling circuit, and are connected to the voltage-current conversion circuit to couple the first current signal and the second current signal, and are connected to the light-emitting circuit to output a variable current signal; The second terminal of the first inductor is connected to the first terminal of the sixth resistor; The second end of the fifth resistor is connected to the first end of the second capacitor; The second terminal of the sixth resistor and the second terminal of the second capacitor are both connected to the power supply ground.

4. The electro-optic conversion circuit as described in claim 1, characterized in that, The control circuit includes a microprocessor; The first input / output terminal of the microprocessor serves as the input terminal of the control circuit and is connected to the sensing circuit to receive the sensing signal; The second and third input / output terminals of the microprocessor serve as the output terminals of the control circuit and are connected to the voltage-to-current conversion circuit to output the DC voltage signal.

5. The electro-optic conversion circuit as described in claim 1, characterized in that, The positive voltage differential signal output from the positive output terminal of the amplifier has a voltage range of +1.2 V to +2.4 V; The negative voltage differential signal output from the negative output terminal of the amplifier has a voltage range of -1.2 V to -2.4 V.

6. The electro-optic conversion circuit as described in claim 1, characterized in that, The amplifier's amplification factor is set to be less than or equal to 5.

7. An optical communication system, characterized in that, Includes the electro-optical conversion circuit as described in any one of claims 1 to 6.

8. An LED lighting fixture, characterized in that, Includes the electro-optical conversion circuit as described in any one of claims 1 to 6.

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