CN112188686B - Single-stage LED drive circuit integrated with visible light communication lamp - Google Patents
Single-stage LED drive circuit integrated with visible light communication lamp Download PDFInfo
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- CN112188686B CN112188686B CN202011189648.XA CN202011189648A CN112188686B CN 112188686 B CN112188686 B CN 112188686B CN 202011189648 A CN202011189648 A CN 202011189648A CN 112188686 B CN112188686 B CN 112188686B
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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
- H05B45/345—Current stabilisation; Maintaining constant 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]
- H05B45/10—Controlling the intensity of the light
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- 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
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Abstract
The invention relates to a single-stage LED driving circuit integrated with a visible light communication lamp, which comprises a single-phase alternating current input power supply, a single-phase rectifier bridge, a first power switch tube, a second power switch tube, a first power diode, a second power diode, a visible light communication LIFI-LED lamp, a first inductor, a second inductor, a first output energy storage capacitor, a second output energy storage capacitor, an output filter capacitor, an intermediate capacitor, a high-frequency transformer and a lighting LED lamp load, wherein the high-frequency transformer comprises a primary winding, a secondary main winding and a secondary auxiliary winding; the invention independently adopts a visible light communication LIFI-LED lamp and an illumination LED lamp respectively, a first power switch tube is used for regulating and controlling the illumination LED lamp, a second power switch tube is used for regulating and controlling the visible light communication LIFI-LED lamp, an instantaneous current feedback closed-loop modulation method is adopted, and the instantaneous current feedback closed-loop modulation method is organically integrated into a single-stage LED driving circuit, so that the problem of conflict between constant illumination intensity and modulation frequency is solved, and the working current required by the illumination LED and the switching frequency of the bandwidth of the LIFI-LED are met to improve the communication data rate.
Description
Technical Field
The invention belongs to the technical field of LED lighting driving power supplies and visible light communication, and particularly relates to a single-stage LED driving circuit integrated with a visible light communication lamp.
Background
The LED is one of the fourth generation electric light sources with wide prospect due to the characteristics of high efficiency, energy conservation and environmental protection. Because of its steep volt-ampere characteristics, constant current control must be employed to achieve the best lighting effect. Therefore, the method has important practical significance for the research of the LED driving circuit with high efficiency, high power factor and low ripple.
The visible light communication technology is a novel wireless communication mode which is rapidly developed in the last decade, and a visible light wireless communication network can be constructed by adding a data transmission additional function on a public infrastructure illumination facility and combining communication with an illumination light source, so that wireless transmission of information from a server to a client is realized. In this case, the LED has great advantages as a light source compared to incandescent lamps and fluorescent lamps, and thus the frequency response of the LED provides sufficient bandwidth for many applications to transmit digital data at high speed. However, the problem of conflict between constant illumination intensity and modulation frequency exists in the existing VLC modulation method, and how to be compatible with visible light communication and LED illumination characteristics is an important subject for developing VLC technology.
Disclosure of Invention
The invention aims to provide a single-stage LED driving circuit integrated with a visible light communication lamp, which integrates the visible light communication lamp and an illumination LED lamp on the same LED driving circuit.
In order to achieve the purpose, the invention adopts the technical scheme that: a single-stage LED drive circuit integrated with a visible light communication lamp comprises a single-phase AC input power supply uinA single-phase rectifier bridge DB and a first power switch tube S1A second power switch tube S2A first power diode D1A second power diode D2Visible light communication LED lamp LIFI-LED and first inductor L1A second inductor L2A first output energy storage capacitor CS1A second output energy storage capacitor CS2An output filter capacitor CO2An intermediate capacitor CnThe high-frequency transformer Tx comprises a primary winding Np, a secondary main winding Ns1 and a secondary auxiliary winding Ns 2;
the single-phase AC input power uinThe two input ends of the single-phase rectifier bridge DB are respectively connected with the two alternating current input ends of the single-phase rectifier bridge DB, the positive output end of the direct current side of the single-phase rectifier bridge DB is connected with the dotted end of the primary winding Np of the high-frequency transformer Tx, and the negative output end of the direct current side of the single-phase rectifier bridge DB is connected with the first power switch tube S1The source electrodes of the two-way transistor are connected; the primary winding Np non-dotted terminal of the high-frequency transformer Tx and the first power switch tube S1The drain electrodes of the two electrodes are connected; the non-dotted terminal of the secondary primary winding Ns1 of the high-frequency transformer Tx and the first power diode D1Is connected to the anode of the high-frequency transformer Tx, the same-name end of the secondary primary winding Ns1 of the high-frequency transformer Tx is connected to the first output energy-storage capacitor CS1Negative polarity terminal of, the output filter capacitor CO2One end of the second power switch tube S2The source electrode of the LED lamp is connected with the negative end of the LIFI-LED lamp; the first power diode D1And the first output energy storage capacitor CS1The positive polarity end of the LED lamp is connected with the anode of the lighting LED lamp load; the non-dotted terminal of the secondary auxiliary winding Ns2 of the high frequency transformer Tx and the second power diode D2Is connected to the anode of the high-frequency transformer Tx, the homonymous terminal of the secondary auxiliary winding Ns2 of the high-frequency transformer Tx and the second output energy-storage capacitor CS2Negative polarity terminal of, the second inductance L2One terminal of, the output filter capacitor CO2The other end of the LED lamp is connected with the cathode of the lighting LED lamp load; the second power diode D2And the second output capacitor CS2Positive terminal and first inductor L1Is connected to one end of the first inductor L1And the other end of the first power switch tube S2And the intermediate capacitor CnIs connected to one end of the intermediate capacitor CnThe other end of the second inductor L2 is connected with the positive end of the visible light communication LED lamp LIFI-LED and the other end of the second inductor L2.
Further, the single-stage LED driving circuit of an integrated visible light communication lamp according to claim 1, wherein: the visible light communication LED lamp LIFI-LED adopts an instantaneous current feedback closed-loop modulation method, which comprises the following steps:
step 1: the sum of the brightness parameter B-L required by visible light communication and the brightness parameter B-VLC corresponding to the visible light communication data forms the total light output P-optical of the communication LED lamp LIFI-LED;
step 2: obtaining an output instantaneous current reference quantity io-ref by a total light output P-optical and an LIFI-LED lamp current transfer function K(s); sampling instantaneous current feedback output by an LIFI-LED lamp;
and step 3: a closed loop feedback compensation network is formed by the instantaneous feedback current io, the current reference amount io-ref and the error amplifier OP; obtaining a second power switch tube S through a PWM modulation unit2The duty ratio adjusts the visible light communication brightness of the LIFI-LED lamp and the current required by data communication.
Further, the single-phase AC input power uinA single-phase rectifier bridge DB, a first power switch tube S1A high frequency transformer Tx, a first power diode D1A first output energy storage capacitor CS1A second power diode D2And a second output energy storage capacitor CS2A Flyback circuit for forming double winding output; the second output energy storage capacitor CS2A second power switch tube S2Visible light communication LED lamp LIFI-LED and second inductor L2An intermediate capacitor CnAnd an output filter capacitor CO2Forming a Step-down Cuk circuit.
Further, the first power switch tube S1A second power switch tube S2All are power MOSFET tubes; two power MOSFET transistors S1、S2Of different operating frequencies, S2Operating frequency ratio S of1High.
Further, the first power diode D1The second power diode D2 is a power semiconductor fast recovery diode.
Further, the first output energy storage capacitor CS1A second output energy storage capacitor CS2All are energy storage electrolytic capacitors, the output filter capacitor CO2An intermediate capacitor CnAre all high frequency capacitors.
Further, the high frequency transformer Tx is a flyback high frequency transformer, and its primary winding Np is opposite to the terminals with the same name of the secondary main winding Ns1 and the secondary auxiliary winding Ns 2.
Compared with the prior art, the invention has the following beneficial effects: the invention respectively and independently adopts the visible light communication lamp LIFI-LED and the illumination LED lamp, and organically integrates the visible light communication lamp LIFI-LED and the illumination LED lamp into the same LED drive circuit, and the communication LIFI-LED lamp adopts an instantaneous current feedback closed-loop modulation method, thereby solving the problem of conflict between constant illumination intensity and modulation frequency, and meeting the working current required by the illumination LED and the switching frequency of the bandwidth of the LIFI-LED so as to improve the data rate. Therefore, the invention has important practical significance.
Drawings
Fig. 1 is a circuit schematic of an embodiment of the invention.
Fig. 2 is a schematic diagram of an instantaneous current feedback closed-loop modulation method adopted by the communication LIFI-LED lamp in the embodiment of the present invention.
Fig. 3 shows a first mode of operation of the circuit according to an embodiment of the invention.
Fig. 4 shows a second mode of operation of the circuit according to the embodiment of the invention.
Fig. 5 shows a third mode of operation of the circuit according to an embodiment of the invention.
Fig. 6 shows a fourth mode of operation of the circuit according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in FIG. 1, the invention provides a single-stage LED driving circuit of an integrated visible light communication lamp, which comprises a single-phase alternating current input power supply uinA single-phase rectifier bridge DB and a first power switch tube S1A second power switch tube S2A first power diode D1A second power diode D2Visible light communication LED lamp LIFI-LED and first inductor L1A second inductor L2A first output energy storage capacitor CS1A second output energy storage capacitor CS2An output filter capacitor CO2An intermediate capacitor CnThe high-frequency transformer Tx comprises a primary winding Np, a secondary main winding Ns1 and a secondary auxiliary winding Ns 2.
The single-phase AC input power uinThe two input ends of the single-phase rectifier bridge DB are respectively connected with the two alternating current input ends of the single-phase rectifier bridge DB, the positive output end of the direct current side of the single-phase rectifier bridge DB is connected with the dotted end of the primary winding Np of the high-frequency transformer Tx, and the negative output end of the direct current side of the single-phase rectifier bridge DB is connected with the first power switch tube S1The source electrodes of the two-way transistor are connected; the primary winding Np non-dotted terminal of the high-frequency transformer Tx and the first power switch tube S1The drain electrodes of the two electrodes are connected; the non-dotted terminal of the secondary primary winding Ns1 of the high-frequency transformer Tx and the first power diode D1Is connected to the anode of the high-frequency transformer Tx, the same-name end of the secondary primary winding Ns1 of the high-frequency transformer Tx is connected to the first output energy-storage capacitor CS1Negative polarity terminal ofOutput filter capacitor CO2One end of the second power switch tube S2The source electrode of the LED lamp is connected with the negative end of the LIFI-LED lamp; the first power diode D1And the first output energy storage capacitor CS1The positive polarity end of the LED lamp is connected with the anode of the lighting LED lamp load; the non-dotted terminal of the secondary auxiliary winding Ns2 of the high frequency transformer Tx and the second power diode D2Is connected to the anode of the high-frequency transformer Tx, the homonymous terminal of the secondary auxiliary winding Ns2 of the high-frequency transformer Tx and the second output energy-storage capacitor CS2Negative polarity terminal of, the second inductance L2One terminal of, the output filter capacitor CO2The other end of the LED lamp is connected with the cathode of the lighting LED lamp load; the second power diode D2And the second output capacitor CS2Positive terminal and first inductor L1Is connected to one end of the first inductor L1And the other end of the first power switch tube S2And the intermediate capacitor CnIs connected to one end of the intermediate capacitor CnThe other end of the second inductor L2 is connected with the positive end of the visible light communication LED lamp LIFI-LED and the other end of the second inductor L2.
In this embodiment, the visible light communication LED lamp LIFI-LED adopts an instantaneous current feedback closed-loop modulation method, which includes the following steps:
step 1: the sum of the brightness parameter B-L required by visible light communication and the brightness parameter B-VLC corresponding to the visible light communication data forms the total light output P-optical of the communication LED lamp LIFI-LED;
step 2: obtaining an output instantaneous current reference quantity io-ref by a total light output P-optical and an LIFI-LED lamp current transfer function K(s); sampling instantaneous current feedback output by an LIFI-LED lamp;
and step 3: a closed loop feedback compensation network is formed by the instantaneous feedback current io, the current reference amount io-ref and the error amplifier OP; obtaining a second power switch tube S through a PWM modulation unit2The duty ratio adjusts the visible light communication brightness of the LIFI-LED lamp and the current required by data communication.
In the present embodiment, the single-phase ac input power uinSingle phase rectifierCurrent bridge DB, first power switch tube S1A high frequency transformer Tx, a first power diode D1A first output energy storage capacitor CS1A second power diode D2And a second output energy storage capacitor CS2A Flyback circuit for forming double winding output; the second output energy storage capacitor CS2A second power switch tube S2Visible light communication LED lamp LIFI-LED and second inductor L2An intermediate capacitor CnAnd an output filter capacitor CO2Forming a Step-down Cuk circuit. The working modes of the Flyback circuit comprise a DCM mode, a BCM mode and a CCM mode; the working mode of the Step-down Cuk circuit is a CCM mode.
In this embodiment, the first power switch S1A second power switch tube S2Are all power MOSFET tubes.
In this embodiment, the first power diode D1The second power diode D2 is a power semiconductor fast recovery diode.
In this embodiment, the first output energy storage capacitor CS1A second output energy storage capacitor CS2All are energy storage electrolytic capacitors, the output filter capacitor CO2An intermediate capacitor CnAre all high frequency capacitors.
In this embodiment, the high frequency transformer Tx is a flyback high frequency transformer, and its primary winding Np is opposite to the terminals with the same name of the secondary main winding Ns1 and the secondary auxiliary winding Ns 2.
The first power switch tube S1 and the second power switch tube S2 work independently, and two paths of mutually independent PWM signals generated by a control circuit are respectively controlled; the first power switch tube S1 controls the lighting LED lamp load in a closed-loop constant current mode, and the second power switch tube S2 controls the brightness and communication data of the visible light communication lamp LIFI-LED to be adjusted by adopting an instantaneous current feedback closed-loop modulation method.
It should be noted that, in the present embodiment, two power MOSFET transistors S1、S2Of different operating frequencies, S2Operating frequency ratio S of1High.
In the present embodimentThe lighting LED lamp is driven by a flyback converter to be controlled in a constant current mode, and the visible light communication LED lamp LIFI-LED adopts an instantaneous current feedback closed-loop modulation method through a partial power Step-down Cuk circuit. The communication modulation principle is shown in figure 2, and the sum of a luminance brightness parameter B-L required by communication and a luminance brightness parameter B-VLC corresponding to visible light communication data forms LIFI-LED lamp total light output P-optical; obtaining an output instantaneous current reference quantity io-ref by a total light output P-optical and an LIFI-LED lamp current transfer function K(s); sampling instantaneous current feedback io output by the LIFI-LED lamp; a closed loop feedback compensation network is formed by the instantaneous feedback current io, the current reference amount io-ref and the error amplifier OP; obtaining a second power MOS switching tube S through a PWM modulation unit2The duty ratio adjusts the visible light communication brightness of the LIFI-LED lamp and the current required by data communication.
As shown in fig. 3 to fig. 6, the present embodiment further provides a specific circuit operation mode of the single-stage LED driving circuit of the integrated visible light communication lamp.
As shown in fig. 3, the power MOSFET transistor S1Conducting power MOSFET S2And conducting. At this time, the single-phase AC input power uinCharging a primary side excitation inductor of the high-frequency transformer Tx through the single-phase rectifier bridge DB; diode D1、D2Cut off due to the reverse voltage; output energy storage electrolytic capacitor CS1、CS2Providing energy to the load. Inductor L1Through power MOSFET tube S2Discharging to the load. Intermediate capacitor CnThrough power MOSFET tube S2And an output filter capacitor CO2For inductor L2And (6) charging.
As shown in fig. 4, the power MOSFET transistor S1Conducting power MOSFET S2And (6) cutting off. At this time, the single-phase AC input power uinCharging a primary side excitation inductor of the high-frequency transformer Tx through the single-phase rectifier bridge DB; diode D1、D2Cut off due to the reverse voltage; output energy storage electrolytic capacitor CS1、CS2Providing energy to the load. Inductor L1Supplying power to a visible light communication LED lamp LIFI-LED through an output filter capacitor CO2To the intermediate capacitor CnAnd (6) charging. Inductor L2Through diode D3And an output filter capacitor CO2And (4) discharging.
As shown in fig. 5, the power MOSFET transistor S1Cut-off, power MOSFET tube S2And conducting. At this time, the diode D1、D2The energy stored in the primary side excitation inductor of the high-frequency transformer Tx is released to the secondary side to supply energy to the load due to the conduction of the high-frequency transformer Tx when the high-frequency transformer is subjected to the forward voltage. Inductor L1Through power MOSFET tube S2Discharging to the load. Intermediate capacitor CnThrough power MOSFET tube S2And an output filter capacitor CO2For inductor L2And (6) charging.
As shown in fig. 6, the power MOSFET transistor S1Cut-off, power MOSFET tube S2And (6) cutting off. At this time, the diode D1、D2The energy stored in the primary side excitation inductor of the high-frequency transformer Tx is released to the secondary side to supply energy to the load due to the conduction of the high-frequency transformer Tx when the high-frequency transformer is subjected to the forward voltage. Inductor L1Through diode D3And an output filter capacitor CO2To the intermediate capacitor CnAnd (6) charging. Inductor L2Supplying power to a visible light communication LED lamp LIFI-LED through an output filter capacitor CO2And (4) discharging.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides an integrated single-stage LED drive circuit of visible light communication lamp which characterized in that: comprising a single-phase AC input source uinA single-phase rectifier bridge DB and a first power switch tube S1A second power switch tube S2A first power diode D1A second power diode D2Visible light communication LED lamp LIFI-LED and first inductor L1A second inductor L2A first output energy storage capacitor CS1A second output energy storage capacitor CS2An output filter capacitor CO2An intermediate capacitor CnThe high-frequency transformer Tx comprises a primary winding Np, a secondary main winding Ns1 and a secondary auxiliary winding Ns 2;
the single-phase AC input power uinThe two input ends of the single-phase rectifier bridge DB are respectively connected with the two alternating current input ends of the single-phase rectifier bridge DB, the positive output end of the direct current side of the single-phase rectifier bridge DB is connected with the dotted end of the primary winding Np of the high-frequency transformer Tx, and the negative output end of the direct current side of the single-phase rectifier bridge DB is connected with the first power switch tube S1The source electrodes of the two-way transistor are connected; the primary winding Np non-dotted terminal of the high-frequency transformer Tx and the first power switch tube S1The drain electrodes of the two electrodes are connected; the non-dotted terminal of the secondary primary winding Ns1 of the high-frequency transformer Tx and the first power diode D1Is connected to the anode of the high-frequency transformer Tx, the same-name end of the secondary primary winding Ns1 of the high-frequency transformer Tx is connected to the first output energy-storage capacitor CS1Negative polarity terminal of, the output filter capacitor CO2One end of the second power switch tube S2The source electrode of the LED lamp is connected with the negative end of the LIFI-LED lamp; the first power diode D1And the first output energy storage capacitor CS1The positive polarity end of the LED lamp is connected with the anode of the lighting LED lamp load; the non-dotted terminal of the secondary auxiliary winding Ns2 of the high frequency transformer Tx and the second power diode D2Is connected to the anode of the high-frequency transformer Tx, the homonymous terminal of the secondary auxiliary winding Ns2 of the high-frequency transformer Tx and the second output energy-storage capacitor CS2Negative polarity terminal of, the second inductance L2One terminal of, the output filter capacitor CO2The other end of the LED lamp is connected with the cathode of the lighting LED lamp load; the second power diode D2And the second output capacitor CS2Positive terminal and first inductor L1Is connected to one end of the first inductor L1And the other end of the first power switch tube S2And the intermediate capacitor CnIs connected to one end of the intermediate capacitor CnThe other end of the first inductor is connected with the positive end of the visible light communication LED lamp LIFI-LED and the other end of the second inductor L2;
the LIFI-LED control of the visible light communication LED lamp adopts an instantaneous current feedback closed-loop modulation method, which comprises the following steps:
step 1: the sum of the brightness parameter B-L required by visible light communication and the brightness parameter B-VLC corresponding to the visible light communication data forms the total light output P-optical of the communication LED lamp LIFI-LED;
step 2: obtaining an output instantaneous current reference quantity io-ref by a total light output P-optical and an LIFI-LED lamp current transfer function K(s); sampling instantaneous current feedback output by an LIFI-LED lamp;
and step 3: a closed loop feedback compensation network is formed by the instantaneous feedback current io, the current reference amount io-ref and the error amplifier OP; obtaining a second power switch tube S through a PWM modulation unit2The duty ratio adjusts the visible light communication brightness of the LIFI-LED lamp and the current required by data communication.
2. The single-stage LED driving circuit of an integrated visible light communication lamp according to claim 1, wherein: the single-phase AC input power uinA single-phase rectifier bridge DB, a first power switch tube S1A high frequency transformer Tx, a first power diode D1A first output energy storage capacitor CS1A second power diode D2And a second output energy storage capacitor CS2A Flyback circuit for forming double winding output; the second output energy storage capacitor CS2A second power switch tube S2Visible light communication LED lamp LIFI-LED and second inductor L2An intermediate capacitor CnAnd an output filter capacitor CO2Forming a Step-down Cuk circuit.
3. The single-stage LED driving circuit of an integrated visible light communication lamp according to claim 1, wherein: the first power switch tube S1A second power switch tube S2All are power MOSFET tubes; two power MOSFET transistors S1And S2Of different operating frequencies, S2Operating frequency ratio S of1High.
4. The single-stage LED driving circuit of an integrated visible light communication lamp according to claim 1, wherein: the first power diode D1The second power diode D2 are power semiconductor fast recovery diodesA tube.
5. The single-stage LED driving circuit of an integrated visible light communication lamp according to claim 1, wherein: the first output energy storage capacitor CS1A second output energy storage capacitor CS2All are energy storage electrolytic capacitors, the output filter capacitor CO2An intermediate capacitor CnAre all high frequency capacitors.
6. The single-stage LED driving circuit of an integrated visible light communication lamp according to claim 1, wherein: the high-frequency transformer Tx is a flyback high-frequency transformer, and the primary winding Np of the flyback high-frequency transformer is opposite to the same-name ends of the secondary main winding Ns1 and the secondary auxiliary winding Ns 2.
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| CN202011189648.XA CN112188686B (en) | 2020-10-30 | 2020-10-30 | Single-stage LED drive circuit integrated with visible light communication lamp |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104363382A (en) * | 2014-04-24 | 2015-02-18 | 北京国承万通信息科技有限公司 | Method and device for transmitting/acquiring information by visible light |
| CN105871194A (en) * | 2016-05-31 | 2016-08-17 | 福州大学 | Step-down Cuk/Flyback single-stage low-ripple-wave LED drive circuit based on flyback converter auxiliary winding |
| US10405389B2 (en) * | 2015-10-21 | 2019-09-03 | Yuyang Dnu Co., Ltd. | Flickerless LED driver device |
| CN110855359A (en) * | 2019-10-21 | 2020-02-28 | 浙江大学 | LED driver capable of simultaneously realizing direct current power line communication and visible light communication |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9814115B2 (en) * | 2015-12-25 | 2017-11-07 | Panasonic Intellectual Property Management Co., Ltd. | Illumination light communication apparatus and communication module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104363382A (en) * | 2014-04-24 | 2015-02-18 | 北京国承万通信息科技有限公司 | Method and device for transmitting/acquiring information by visible light |
| US10405389B2 (en) * | 2015-10-21 | 2019-09-03 | Yuyang Dnu Co., Ltd. | Flickerless LED driver device |
| CN105871194A (en) * | 2016-05-31 | 2016-08-17 | 福州大学 | Step-down Cuk/Flyback single-stage low-ripple-wave LED drive circuit based on flyback converter auxiliary winding |
| CN110855359A (en) * | 2019-10-21 | 2020-02-28 | 浙江大学 | LED driver capable of simultaneously realizing direct current power line communication and visible light communication |
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