CN115297584A - Electro-optical conversion circuit, optical communication system and LED lamp - Google Patents

Electro-optical conversion circuit, optical communication system and LED lamp Download PDF

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Publication number
CN115297584A
CN115297584A CN202210737015.0A CN202210737015A CN115297584A CN 115297584 A CN115297584 A CN 115297584A CN 202210737015 A CN202210737015 A CN 202210737015A CN 115297584 A CN115297584 A CN 115297584A
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China
Prior art keywords
signal
current
circuit
voltage
resistor
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CN202210737015.0A
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Chinese (zh)
Inventor
周明杰
阮云燎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Haiyangwang Petroleum Lighting Technology Co ltd
Oceans King Lighting Science and Technology Co Ltd
Oceans King Dongguan Lighting Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
Original Assignee
Shenzhen Haiyangwang Petroleum Lighting Technology Co ltd
Oceans King Lighting Science and Technology Co Ltd
Oceans King Dongguan Lighting Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Application filed by Shenzhen Haiyangwang Petroleum Lighting Technology Co ltd, Oceans King Lighting Science and Technology Co Ltd, Oceans King Dongguan Lighting Technology Co Ltd, Shenzhen Oceans King Lighting Engineering Co Ltd filed Critical Shenzhen Haiyangwang Petroleum Lighting Technology Co ltd
Priority to CN202210737015.0A priority Critical patent/CN115297584A/en
Publication of CN115297584A publication Critical patent/CN115297584A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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Abstract

An electro-optical conversion circuit, an optical communication system and an LED lamp are connected with the input end of an optical fiber, and sense signals are output by sensing the working state of equipment to be monitored through sensing electricity; the control circuit outputs a direct current voltage signal based on the induction signal, and the direct current voltage signal carries working state information of the equipment to be monitored; the voltage-current conversion circuit converts the direct-current voltage signal into a first current signal and a second current signal; the light emitting circuit emits light according to the first current signal to output an optical signal to the optical fiber. Because the analog electric signal with induction circuit turns into the light signal, transmits the light signal through the optic fibre of access again to promote the transmission rate and the transmission efficiency of electric signal by a wide margin, the big data management and the analysis of the wisdom illumination of being convenient for.

Description

Electro-optical conversion circuit, optical communication system and LED lamp
Technical Field
The application belongs to the technical field of optical communication, and particularly relates to an electro-optical conversion circuit, an optical communication system and an LED lamp.
Background
The existing distributed lighting system is gradually unable to meet the demand of people. 4G and 5G intelligent illumination can show the working condition of each lighting device and even each LED lamp bead in the visual field of people. People can make planning layout at any time according to the working condition of the lamp so as to adapt to various complex environments.
At present, the working state data of the intelligent lighting system needs to be uploaded to a server, various data of the lighting lamp are mainly collected, various data are converted into electric signals, and the electric signals are uploaded to the server in a wireless transmission or common cable transmission mode. When the number of the collected working state data types is small and the data volume is small, the transmission rate and the transmission efficiency can be guaranteed, but when the number of the intelligent lighting lamps is gradually increased, the number of the working state data types to be collected is also increased, and the data types and the data volume are extremely large, the transmission efficiency and the transmission rate cannot be fully guaranteed by adopting wireless transmission or common cable transmission for electric signals.
Therefore, the conventional technical scheme has the problems of low transmission rate and low efficiency of electric signal data transmission when the data volume is large.
Disclosure of Invention
The application aims to provide an electro-optical conversion circuit, and aims to solve the problems of low transmission rate and low efficiency of electric signal data existing when working state data of a traditional LED lamp is uploaded to a server.
A first aspect of the embodiments of the present application provides an electrical-to-optical conversion circuit, connected to an input end of an optical fiber, including:
the sensing circuit is configured to sense the working state of the equipment to be monitored so as to output a sensing signal;
the control circuit is connected with the sensing circuit and is configured to output a direct current voltage signal based on a sensing signal, and the direct current voltage signal carries the working state information of the equipment to be monitored;
a voltage-current conversion circuit connected to the control circuit and configured to convert the dc voltage signal into a first current signal and a second current signal;
and the light-emitting circuit is connected with the voltage-current conversion circuit and 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.
In one embodiment, the sensing circuit comprises:
the detection circuit is configured to detect the working state of the equipment to be monitored so as to output an analog detection signal;
an analog-to-digital conversion circuit connected to the detection circuit and the control circuit and configured to convert the analog detection signal into an inductive signal.
In one embodiment, the method further comprises the following steps:
a current coupling circuit connected to the voltage-to-current conversion circuit and the light emitting circuit, and 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 to output an optical signal to the optical fiber.
In one embodiment, the voltage-current conversion circuit includes an amplifier, a first triode, a second triode, a first capacitor, a first resistor, a second resistor, a third resistor and a fourth resistor, wherein the first triode is a PNP-type triode and the second triode is an NPN-type triode;
the positive phase input end of the amplifier and the negative phase input end of the amplifier are jointly used as the direct current voltage signal input end of the voltage-current conversion circuit and connected with the control circuit so as to be connected with the direct current voltage signal;
the positive output end of the amplifier is connected with the base electrode of the first triode, and the negative output end of the amplifier is connected with the first end of the first resistor;
a collector of the first triode is connected with a first end of the second resistor, a second end of the second resistor and a first power supply are used as a first current signal output end of the voltage-current conversion circuit and are connected with the light-emitting circuit so as to output a first current signal;
an emitting electrode of the first triode is connected with a first end of the first capacitor;
the second end of the first resistor is connected with the base electrode of the second triode;
an emitting electrode of the second triode is connected with a first end of the third resistor;
a second end of the third resistor is used as a second current signal output end of the voltage-current conversion circuit, and is connected with the light-emitting circuit and the current coupling circuit to output a second current signal;
the collector of the second triode is connected with the first end of the fourth resistor;
the second end of the first capacitor and the second end of the fourth resistor are connected to a power ground in common.
In one embodiment, the current coupling circuit comprises 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 are jointly used as the input and output ends of the current coupling circuit, are connected with the voltage-current conversion circuit to couple the first current signal and the second current signal, and are connected with the light-emitting circuit to output a variable current signal;
the second end of the first inductor is connected with the first end of the sixth resistor;
the second end of the fifth resistor is connected with the first end of the second capacitor;
and the second end of the sixth resistor and the second end of the second capacitor are connected to a power ground in common.
In one embodiment, the control circuit comprises a microprocessor;
a first input/output end of the microprocessor is used as an input end of the control circuit and is connected with the sensing circuit so as to access the sensing signal;
and the second input and output end of the microprocessor and the third input and output end of the microprocessor are used as output ends of the control circuit and are connected with the voltage-current conversion circuit so as to output the direct-current voltage signal.
In one of the embodiments, the first and second electrodes are,
the voltage range of the positive voltage differential signal output by the positive electrode output end of the amplifier is + 1.2V- +2.4V;
the voltage range of the negative voltage differential signal output by the negative electrode output end of the amplifier is-1.2V to-2.4V.
In one of the embodiments, the first and second electrodes are,
the amplification factor of the amplifier is set to be less than or equal to 5 times.
A second aspect of embodiments of the present application provides an optical communication system,
comprising an electro-optical conversion circuit as described in any one of the above first aspects.
A third aspect of embodiments of the present application provides an LED luminaire,
comprising an electro-optical conversion circuit as described in any one of the above first aspects.
Compared with the prior art, the embodiment of the application has the advantages that:
the working state of the equipment to be monitored is subjected to analog electric signals obtained through the induction circuit, direct current voltage signals are generated through the control circuit, the direct current voltage signals are converted into current signals by the voltage-current conversion circuit, the current signals can output variable current signals according to input changes of the induction circuit, the laser diodes are driven by the variable current signals to emit light pulse signals, the electric signals are converted into light signals, the light signals are output to optical fibers to be transmitted, the transmission rate and the transmission efficiency of the signals are greatly improved, and intelligent illumination big data management and analysis are facilitated.
Drawings
Fig. 1 is a schematic structural diagram of an electrical-to-optical conversion circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a sensing circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an electrical-to-optical conversion circuit according to an embodiment of the present disclosure;
fig. 4 is an exemplary circuit schematic diagram of an electrical-to-optical conversion circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present application, "a plurality" means two or more unless specifically limited otherwise.
The present embodiment provides an electro-optical conversion circuit, which is connected to an input end of an optical fiber, as shown in fig. 1, and for convenience of description, only the parts related to the present embodiment are shown, and detailed as follows:
the electro-optical conversion circuit includes an induction circuit 11, a control circuit 12, a voltage-current conversion circuit 13, and a light emitting circuit 14.
The sensing circuit 11 is configured to sense an operating state of the device to be monitored, so as to output a sensing signal.
And the control circuit 12 is connected with the sensing circuit 11 and configured to output a direct current voltage signal based on the sensing signal, wherein the direct current voltage signal carries the working state information of the device to be monitored.
And a voltage-current conversion circuit 13 connected to the control circuit 12 and configured to convert the dc voltage signal into a first current signal and a second current signal.
And the light emitting circuit 14 is connected with the voltage-current conversion circuit 13 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.
In specific implementation, the device to be monitored comprises an LED lamp, and the operating state information of the LED lamp is transmitted to the optical fiber in the form of an optical signal through the sensing circuit 11, the control circuit 12, the voltage-current conversion circuit 13, and the light emitting circuit 14.
Because the induction circuit 11, the control circuit 12, the voltage-current conversion circuit 13 and the light-emitting circuit 14 form an electro-optical conversion circuit, the working state information of the LED lamp can be transmitted to the optical fiber in an optical signal mode in a high-precision and continuous mode, and the manager of the intelligent lighting system can obtain the real-time working state information of the LED lamp conveniently.
As shown in fig. 2, the sensing circuit 11 includes a detection circuit 111 and an analog-to-digital conversion circuit 112.
The detection circuit 111 is configured to detect an operating state of the device to be monitored, so as to output an analog detection signal. And an analog-to-digital conversion circuit 112 connected to the detection circuit 111 and the control circuit 12 and configured to convert the analog detection signal into an induction signal.
In specific implementation, the intelligent lighting system comprises a plurality of LED lamps, each LED lamp comprises a plurality of LED lamp beads, and the working state parameters of each LED lamp comprise the voltage, the current, the power, the working temperature, the color temperature, the illumination, the brightness, the color rendering index, the spectrum, the luminous flux and other parameters of one or more LED lamp beads. The color temperature, the illumination, the brightness, the color rendering index, the spectrum and the luminous flux are optical signal parameters, and when the LED lamp works, a detection circuit 111 comprising an optical signal sensor is used for collecting and outputting an analog detection signal; the voltage, the current and the power are electrical signal parameters, the detection circuit 111 capable of collecting electrical signals is used for detecting and outputting analog detection signals, and the detection circuit 111 comprising a temperature sensor is used for detecting and outputting analog detection signals when the working temperature of the LED lamp is required to work. The analog-to-digital conversion circuit 112 is connected to the detection circuit 111 and the control circuit 12, and converts the analog detection signal output by the detection circuit 111 into the sensing signal.
Since the detection circuit 111 and the analog-to-digital conversion circuit 112 can convert the analog detection signal into the digital sensing signal, the accuracy of detecting the working state of the device to be monitored can be improved, and the subsequent signal processing is facilitated.
For example, a detection circuit 111 including a temperature sensor is arranged to collect the operating temperature of a single LED lamp bead in the LED lamp, the operating temperature range of the LED lamp bead is 40-100 ℃, the detection circuit 111 detects the temperature change of the operating state of the single LED lamp bead in the LED lamp, and outputs an analog detection signal with temperature change information. The analog-to-digital conversion circuit 112 then converts the analog detection signal with temperature change information output from the detection circuit 111 into a sense signal with temperature change information.
It should be noted that the single LED lamp bead has different light emitting colors, when the number of the light emitting chips in the single LED lamp bead is less than or equal to 2, the operating voltage range of the single LED lamp bead is 1.5V to 6.6V, and the voltage range of the digital voltage signal is set to 1.5V to 6.6V according to the operating voltage setting range of the single LED lamp bead. The operating condition parameter when single LED lamp pearl sends white light still includes: the voltage range is set to 5.0V to 6.6V, the current is set to 90mA to 300mA, the power is set to 1W to 3W, the color temperature is set to 5200K to 6200K, and the luminous flux is set to 1200Lm to 1500Lm, wherein the current is preferably set to 150mA.
As shown in fig. 3, the electro-optical conversion circuit further includes a current coupling circuit 15.
The current coupling circuit 15 is connected to the voltage-current conversion circuit 13 and the light emitting circuit 14, and 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.
In one embodiment, 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 spikes in the current signal.
Because the current coupling circuit 15 filters the peak signal in the current signal, the voltage at the two ends of the light-emitting circuit 14 is stable, the stability of the amplitude of the working voltage of the light-emitting circuit is improved, and the light-emitting device of the light-emitting circuit 14 is prevented from being damaged due to the breakdown of the peak signal.
As shown in fig. 4, the control circuit 12 includes a microprocessor U1, and a first input/output end P1.0 of the microprocessor U1 is used as an input end of the control circuit 12, and is connected to the sensing circuit 11 to receive a sensing signal; the second input/output end P1.1 of the microprocessor U1 and the third input/output end P1.2 of the microprocessor U1 are used as output ends of the control circuit 12, and are connected to the voltage/current conversion circuit 13 to output a dc voltage signal.
The microprocessor U1 is specifically configured to access the digital sensing signal, analyze and process the digital sensing signal, and convert the digital sensing signal into a stable and accurate dc voltage signal, where the dc voltage signal includes an actual working condition of the device to be monitored. In one embodiment, according to the working temperature range of a single LED lamp bead, the voltage range of the current dc voltage signal output by the control circuit 12 from the single LED lamp bead is 0.2V to 1.0V, and the voltage of the dc voltage signal includes the actual working condition of the current LED lamp bead.
As shown in fig. 4, the voltage-current conversion circuit 13 includes an amplifier U2, a first triode Q1, a second triode Q2, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, wherein in this embodiment, the first triode Q1 is an NPN-type triode, and the second triode Q2 is a PNP-type triode.
The positive phase input end + of the amplifier U2 and the negative phase input end-of the amplifier are jointly used as the direct current voltage signal input end of the voltage-current conversion circuit 13 and connected with the control circuit 12 to access the direct current voltage signal; the positive phase output end + OUT of the amplifier U2 is connected with the base electrode of the first triode Q1, and the negative phase output end-OUT of the amplifier U2 is connected with the first end of the first resistor R1; a collector of the first triode Q1 is connected to a first end of the second resistor R2, a second end of the second resistor R2 and the first power VCC are used as a first current signal output end of the voltage-current conversion circuit 13, and are connected to the light-emitting circuit 14 to output a first current signal; an emitting electrode of the first triode Q1 is connected with a first end of the first capacitor C1; the second end of the first resistor R1 is connected with the base electrode of the second triode Q2; an emitting electrode of the second triode Q2 is connected with a first end of a third resistor R3; a second end of the third resistor R3 is used as a second current signal output end of the voltage-current conversion circuit 13, and is connected with the light-emitting circuit 14 and the current coupling circuit 15 to output a second current signal; the collector of the second triode Q2 is connected with the first end of the fourth resistor R4; the second end of the first capacitor C1 and the second end of the fourth resistor R4 are commonly connected to the power ground.
The voltage-current conversion circuit 13 converts the dc voltage signal into a first current signal and a second current signal, and mainly amplifies the dc voltage signal by the amplifier U2 and converts the dc voltage signal into a voltage differential signal with different polarities, the positive phase output terminal + OUT of the amplifier U2 outputs a positive voltage differential signal, the negative phase output terminal-OUT of the amplifier U2 outputs a negative voltage differential signal, and the voltage of the amplified positive voltage differential signal makes the first triode Q1 work in an amplification area, so as to convert the positive voltage differential signal into the first current signal, and the variable voltage of the amplified negative voltage differential signal controls the conduction degree of the second triode Q2, and converts the negative voltage differential signal into the second current signal.
More specifically, the second terminal of the first capacitor C1 is connected to the power ground, the first capacitor C1 filters and reduces noise in the amplified signal passing through the amplifier U2, so that the dc voltage signal data passing through the amplifier has high fidelity, and the second terminal of the first capacitor C1 is connected to the power ground, so that the voltage between the base of the first transistor Q1 and the emitter of the first transistor Q1 reaches the turn-on voltage of the first transistor Q1, thereby operating the first transistor Q1 in the amplification region.
More specifically, the second resistor R2 is connected between the first power source VCC and the collector of the first triode Q1, wherein the first power source VCC is a constant voltage and constant current power source, and the amplified variable differential first current signal shunts the constant current provided by the first power source VCC through the second resistor R2, so that the second ends of the first power source VCC and the second resistor R2 are connected as the first current signal output end of the voltage-current conversion circuit 13 to output the variable first current signal.
It should be noted that, in this embodiment, the voltage range of the positive voltage differential signal outputted from the non-inverting output terminal + OUT of the amplifier U2 is set to +1.2V ÷ +2.4V, so that the voltage between the base of the first triode Q1 and the emitter of the first triode Q1 reaches the turn-on voltage of the first triode Q1, so that the base of the first triode Q1 and the emitter of the first triode Q1 form a positive bias, and the values of the first power source VCC and the second resistor R2 are appropriately selected, so that the collector of the first triode Q1 and the base of the first triode Q1 form a negative bias, so that the first triode Q1 normally operates in the amplification area; the voltage range of the negative voltage differential signal output by the negative phase output end-OUT of the amplifier U2 is set to-1.2V to-2.4V, and the value of the third resistor R3 is properly selected, so that the voltage between the emitter of the second triode Q2 and the base of the second triode Q2 reaches the turn-on voltage of the second triode Q2, the emitter of the second triode Q2 and the base of the second triode Q2 form positive bias, and the base of the second triode Q2 and the collector of the second triode Q2 form reverse bias, so that the second triode Q2 works in the amplification area.
In addition, the resistance of the second resistor R2 is set to be equal to the resistance of the third resistor R3, when the resistance 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, and meanwhile, the resistance of the third resistor R3 is set such that the voltage of the first end of the third resistor R3 connected to the emitter of the second triode Q2 is higher than the voltage of the base of the second triode Q2, so that the voltage between the base of the second triode Q2 and the emitter of the second triode Q2 reaches the turn-on voltage of the second triode Q2, thereby allowing the second triode Q2 to operate in the amplification region. Meanwhile, the first resistor R1 is connected between the negative phase output end-OUT of the amplifier U2 and the base electrode of the second triode Q2, the voltage of the negative voltage differential signal can be pulled up, so that the base electrode of the second triode Q2 and the collector electrode of the second triode Q2 form reverse bias, the first end of the fourth resistor R4 is connected with the collector electrode of the second triode Q2, the second end of the fourth resistor R4 is connected with a power ground, the fourth resistor R4 mainly acts as pull-down to the power ground, the second triode Q2 is guaranteed not to be changed by a front end signal, and normal work can be kept.
Alternatively, the amplification factor of the 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 is amplified to 0.6V to 3.0V from 0.2V to 1.0V.
As shown in fig. 4, the light emitting circuit 14 includes a laser diode LD.
As shown in fig. 4, the current coupling circuit 15 includes a fifth resistor R5, a sixth resistor R6, a first inductor L1, and a second capacitor C2.
The first end of the first inductor L1 and the first end of the fifth resistor R5 are used as the input/output end of the current coupling circuit 15, connected to the voltage-to-current conversion circuit 13 to couple the first current signal and the second current signal, and connected to the light emitting circuit 14 to output a variable current signal; the second end of the first inductor L1 is connected with the first end of the sixth resistor R6; the second end of the fifth resistor R5 is connected with the first end of the second capacitor C2; a second end of the sixth resistor R6 and a second end of the second capacitor C2 are connected to the power ground in common.
The current coupling circuit 15 mainly filters and absorbs the peak 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 at the two ends of the laser diode LD stable, obtain a smooth first current signal, prevent the laser diode LD from being damaged by the peak signal, and prolong the service life of the laser diode LD.
More specifically, the third resistor R3, the fifth resistor R5, and the sixth resistor R6 constitute a small-sized direct proportional circuit, and the resistance of the fifth resistor R5 is set to 2 times the resistance of the third resistor R3.
More specifically, the second capacitor C2 is pulled down to ground, and filters and absorbs the induced current generated by the first inductor L1 and the spike of the first current signal, so as to further keep the voltage across the laser diode LD stable.
Compared with the prior art, the embodiment of the application has the advantages that:
through the operating condition who treats supervisory equipment obtains the simulation signal of telecommunication through induction circuit, generate direct current voltage signal through control circuit again, voltage current converting circuit truns into direct current voltage signal for the current signal, the current signal can change and output variable current signal according to induction circuit's input, adopt variable current signal drive laser diode to send optical pulse signal again, thereby turn into the light signal with the signal of telecommunication, again with light signal output to optic fibre transmission, thereby promote the transmission rate and the transmission efficiency of signal by a wide margin, the big data management and the analysis of wisdom illumination of being convenient for.
The following further description of the part shown in fig. 4 is made in conjunction with the working principle diagram:
the detection circuit 111 detects the working state of an LED4 lamp bead in the LED lamp and outputs an analog detection signal, and the analog-to-digital conversion circuit 112 accesses the analog detection signal and converts the analog detection signal into a digital induction signal so as to output the digital induction signal; a first input/output end P1.0 of the microprocessor U1 is connected with a digital induction signal, a second input/output end P1.1 of the microprocessor U1 is connected with a negative phase input end-of the amplifier U2 to output a first direct current voltage signal, and a third input/output end P1.2 of the microprocessor U1 is connected with a positive phase input end + of the amplifier U2 to output a second direct current voltage signal; the amplifier U2 converts the direct-current voltage signal into a voltage differential signal with different polarities, a positive phase output end + OUT of the amplifier U2 outputs a variable positive voltage differential signal, and a negative phase output end-OUT of the amplifier U2 outputs a variable negative voltage differential signal; the positive voltage differential signal turns on the first triode Q1 to output an amplified differential first current signal, and the amplified variable differential first current signal shunts the constant current provided by the first power supply VCC through the second resistor R2, so that the variable first current signal, which is obtained by coupling the constant current provided by the first power supply VCC with the current of the variable differential first current signal, emits light through the laser diode LD and transmits an optical signal to the optical fiber.
A variable first current signal flowing OUT of the laser diode LD flows through a node A, a part of the current flows into an emitting electrode of a second triode Q2 through a third resistor R3, the second triode Q2 is started, a loop is formed by grounding a collecting electrode of the second triode Q2 and a fourth resistor R4, and the current returns to a negative phase output end-OUT of an amplifier U2 through a base electrode of the second triode Q2 and a first resistor R1 to form a loop; another part of the current is coupled with the induced current generated by the first inductor L1, the coupled current flows through the fifth resistor R5 and is absorbed by the grounded second capacitor C2, and a part of the induced current generated by the first inductor L1 flows into the ground through the grounded sixth resistor R6 to form a loop. The value ranges of all components of the electro-optical conversion circuit need to meet the working principle.
A second aspect of the present embodiment provides an optical communication system including the electrical-to-optical conversion circuit as described in any one of the first aspects.
A third aspect of embodiments of the present application provides an LED luminaire including the electrical-to-optical conversion circuit as described in any one of the first aspects.
The optical fiber transmission has the advantages of high sensitivity, high bandwidth, large communication quantity, small attenuation and long transmission distance. The intelligent lighting system can fully meet the communication and transmission of mass information data of the lamp, and is convenient for large data management and analysis of intelligent lighting.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. An electro-optic conversion circuit connected to an input end of an optical fiber, comprising:
the sensing circuit is configured to sense the working state of the equipment to be monitored so as to output a sensing signal;
the control circuit is connected with the sensing circuit and is configured to output a direct current voltage signal based on a sensing signal, and the direct current voltage signal carries the working state information of the equipment to be monitored;
a voltage-current conversion circuit connected to the control circuit and configured to convert the dc voltage signal into a first current signal and a second current signal;
and the light-emitting circuit is connected with the voltage-current conversion circuit and is configured to emit light according to the first current signal and the second current signal so as to output light signals to the optical fiber.
2. The electrical-to-optical conversion circuit of claim 1, wherein the sensing circuit comprises:
the detection circuit is configured to detect the working state of the equipment to be monitored so as to output an analog detection signal;
an analog-to-digital conversion circuit connected to the detection circuit and the control circuit and configured to convert the analog detection signal into an induction signal.
3. The electrical-to-optical conversion circuit of claim 1, further comprising:
a current coupling circuit connected to the voltage-to-current conversion circuit and the light emitting circuit, and 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 to output an optical signal to the optical fiber.
4. The electrical-to-optical conversion circuit according to claim 1, wherein the voltage-to-current conversion circuit comprises 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 positive phase input end of the amplifier and the negative phase input end of the amplifier are jointly used as the direct current voltage signal input end of the voltage-current conversion circuit and connected with the control circuit so as to be connected with the direct current voltage signal;
the positive output end of the amplifier is connected with the base electrode of the first triode, and the negative output end of the amplifier is connected with the first end of the first resistor;
a collector of the first triode is connected with a first end of the second resistor, a second end of the second resistor and a first power supply are used as a first current signal output end of the voltage-current conversion circuit and are connected with the light-emitting circuit so as to output a first current signal;
an emitting electrode of the first triode is connected with a first end of the first capacitor;
the second end of the first resistor is connected with the base electrode of the second triode;
an emitting electrode of the second triode is connected with a first end of the third resistor;
a second end of the third resistor is used as a second current signal output end of the voltage-current conversion circuit, and is connected with the light-emitting circuit and the current coupling circuit to output a second current signal;
the collector of the second triode is connected with the first end of the fourth resistor;
the second end of the first capacitor and the second end of the fourth resistor are connected to a power ground in common.
5. The electrical-to-optical conversion circuit of claim 1, wherein the current coupling circuit comprises 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 are jointly used as the input and output ends of the current coupling circuit, are connected with the voltage-current conversion circuit to couple the first current signal and the second current signal, and are connected with the light-emitting circuit to output a variable current signal;
the second end of the first inductor is connected with the first end of the sixth resistor;
the second end of the fifth resistor is connected with the first end of the second capacitor;
and a second end of the sixth resistor and a second end of the second capacitor are connected to a power ground in common.
6. The electrical-to-optical conversion circuit of claim 1,
the control circuit comprises a microprocessor;
a first input/output end of the microprocessor is used as an input end of the control circuit and is connected with the sensing circuit so as to access the sensing signal;
and the second input and output end of the microprocessor and the third input and output end of the microprocessor are used as output ends of the control circuit and are connected with the voltage-current conversion circuit so as to output the direct-current voltage signal.
7. The electro-optic conversion circuit of claim 4,
the voltage range of the positive voltage differential signal output by the positive electrode output end of the amplifier is + 1.2V- +2.4V;
the voltage range of the negative voltage differential signal output by the negative electrode output end of the amplifier is-1.2V to-2.4V.
8. The electrical-to-optical conversion circuit of claim 4,
the amplification factor of the amplifier is set to be less than or equal to 5 times.
9. An optical communication system, characterized in that,
comprising an electro-optical conversion circuit according to any of claims 1 to 8.
10. An LED lamp is characterized in that the LED lamp is provided with a plurality of LED light sources,
comprising an electro-optical conversion circuit according to any of claims 1 to 8.
CN202210737015.0A 2022-06-27 2022-06-27 Electro-optical conversion circuit, optical communication system and LED lamp Pending CN115297584A (en)

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Application Number Priority Date Filing Date Title
CN202210737015.0A CN115297584A (en) 2022-06-27 2022-06-27 Electro-optical conversion circuit, optical communication system and LED lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210737015.0A CN115297584A (en) 2022-06-27 2022-06-27 Electro-optical conversion circuit, optical communication system and LED lamp

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CN115297584A true CN115297584A (en) 2022-11-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116094877A (en) * 2023-04-11 2023-05-09 浙江地芯引力科技有限公司 Differential signal transmission circuit and data transmission device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116094877A (en) * 2023-04-11 2023-05-09 浙江地芯引力科技有限公司 Differential signal transmission circuit and data transmission device

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