JP2023103514A - Visible light communication transmission device - Google Patents

Visible light communication transmission device Download PDF

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JP2023103514A
JP2023103514A JP2022004052A JP2022004052A JP2023103514A JP 2023103514 A JP2023103514 A JP 2023103514A JP 2022004052 A JP2022004052 A JP 2022004052A JP 2022004052 A JP2022004052 A JP 2022004052A JP 2023103514 A JP2023103514 A JP 2023103514A
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generating circuit
wave generating
triangular wave
visible light
mux
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義博 升井
Yoshihiro Masui
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Tsuru Gakuen
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Tsuru Gakuen
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    • 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

Abstract

To provide a transmission device capable of adjusting illuminance without changing the brightness of illumination and causing no flicker even when any data is transmitted in visible light communication using illumination.SOLUTION: In a case in which transmission data is superimposed on visible light, the duty ratio (time to be H) of an LED drive signal when "0 (L)" is superimposed and when "1 (H)" is superimposed is fixed, "0 (L)" and "1 (H)" are distinguished by the number of pulses in a certain interval. Therefore, the brightness determined by the duty ratio and the transmission data "0 (L)" and "1 (H)" can be handled independently. The brightness of the lighting is unchanged, flicker does not occur, and the illuminance can be adjusted.SELECTED DRAWING: Figure 1

Description

本発明は可視光通信送信装置に関するものである。 The present invention relates to a visible light communication transmitter.

LED（発光ダイオード）照明等が発する可視光を利用してデータの送受信を行う可視光通信技術が開発されている（例えば特許文献１、特許文献２参照）。可視光通信は電波を利用した無線通信と比較して、通信データの秘匿性が高く、人体への悪影響がほとんど無いという特徴を備えている。 Visible light communication technology for transmitting and receiving data using visible light emitted by LED (light emitting diode) lighting or the like has been developed (see Patent Documents 1 and 2, for example). Compared with wireless communication using radio waves, visible light communication is characterized by high secrecy of communication data and almost no adverse effects on the human body.

特開２０１２-４９９０１号広報Japanese Patent Application Publication No. 2012-49901 特開２０１０-４１４７６号広報Japanese Unexamined Patent Application Publication No. 2010-41476

特許文献１は可視光通信装置の送信装置に関するものであり、可視光通信装置を構成する回路を極めて簡素化することができ、消費電力を低減することができる発明である。しかし、LED照明に発明を適用した場合、送信データの変化による照明の明るさ変動や照明のちらつき対策が検討されていないという課題が残る。また特許文献２ではデュ―ティ比の均一化を図り、照明のちらつきを抑制する発明を提案している。しかし、照明のちらつきは抑制できるが、調光をどう行うかが検討されていない。照明を利用した可視光通信において、どのようなデータを送信する場合でも、照明の明るさが不変であり、ちらつきが発生せず、照度の調整が可能となる送信装置が求められている。 Patent Literature 1 relates to a transmitter for a visible light communication device, and is an invention capable of extremely simplifying circuits constituting the visible light communication device and reducing power consumption. However, when the invention is applied to LED lighting, there remains the problem that countermeasures against fluctuations in lighting brightness and flickering of lighting due to changes in transmission data have not been considered. Further, Japanese Patent Laid-Open No. 2002-200000 proposes an invention that attempts to make the duty ratio uniform and suppresses the flickering of illumination. However, although the flickering of lighting can be suppressed, how to perform light control has not been studied. In visible light communication using lighting, there is a demand for a transmission device that can adjust the illuminance without changing the brightness of the lighting and flickering no matter what kind of data is transmitted.

本発明では送信データを可視光に重畳する時、「０（L）」を重畳する場合と「１（H）」を重畳する場合のLED駆動用信号のデューティ比（Hとなる時間）を一定とし、一定区間内のパルスの数で「０（L）」と「１（H）」を区別する。そのためデューティ比により決まる明るさと、送信データの「０（L）」と「１（H）」を独立して扱うことができる。 In the present invention, when transmitting data is superimposed on visible light, the duty ratio (time to become H) of the LED driving signal when superimposing "0 (L)" and "1 (H)" is constant. "0 (L)" and "1 (H)" are distinguished by the number of pulses in a certain interval. Therefore, the brightness determined by the duty ratio and the transmission data "0 (L)" and "1 (H)" can be handled independently.

本発明によればLED照明等を利用した可視光通信において、どのようなデータを送信する場合でも、照明の明るさが不変であり、ちらつきが発生せず、照度の調整が可能となる。 According to the present invention, in visible light communication using LED lighting or the like, the brightness of the lighting remains unchanged, flickering does not occur, and illuminance can be adjusted regardless of the transmission of any data.

発明を実施するための一形態を示すブロック図である。It is a block diagram showing one form for carrying out the invention. 図１で示したブロック図における各ノードの波形例を示した図である。2 is a diagram showing an example of waveforms at each node in the block diagram shown in FIG. 1; FIG.

本発明を実施するための形態について図面を用いて説明する。図１は本発明を実施するための一形態を示すブロック図である。図２は図１で示したブロック図における各ノードの波形例を示した図である。外部から供給されるCK（クロック）を受け、三角波生成回路１と三角波生成回路２は異なる周期の三角波をそれぞれ生成する。生成された三角波はMUX３に入力され、外部から供給されるDATA（可視光に重畳したい送信データ）により切替られOUTとして出力される。例えばDATAが０（L）である時にMUXは三角波１を出力し、DATAが１（H）である時にMUXは三角波２を出力する。MUXの切替は、DATAが０（L）である時にMUXが三角波２を出力し、DATAが１（H）である時にMUXが三角波１を出力しても良い。MUXの出力OUTは照度調整用信号と比較器４にて比較され、LED駆動用信号を生成する。この時、DATAが０（L）であっても１（H）であってもLED駆動用信号のデューティ比（Hとなる時間）が変わらないためLEDの明るさが変わることはない。また、三角波１と三角波２の周期を十分短くすることでLEDの点滅は人の目では感知できず、照明のちらつきとして問題になることもない。更に、比較器４に入力する照度調整用信号を制御することで送信データに制約されることなく照明の明るさ調整が可能となる。 A mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment for carrying out the present invention. FIG. 2 is a diagram showing an example of waveforms at each node in the block diagram shown in FIG. Upon receiving an externally supplied CK (clock), the triangular wave generating circuit 1 and the triangular wave generating circuit 2 respectively generate triangular waves with different cycles. The generated triangular wave is input to MUX 3, switched by externally supplied DATA (transmission data to be superimposed on visible light), and output as OUT. For example, MUX outputs triangular wave 1 when DATA is 0 (L), and MUX outputs triangular wave 2 when DATA is 1 (H). MUX may be switched by outputting triangular wave 2 when DATA is 0 (L) and outputting triangular wave 1 when DATA is 1 (H). The output OUT of the MUX is compared with the illuminance adjustment signal by the comparator 4 to generate the LED drive signal. At this time, even if DATA is 0 (L) or 1 (H), the duty ratio of the LED driving signal (the time at which it is H) does not change, so the brightness of the LED does not change. Also, by sufficiently shortening the cycles of the triangular wave 1 and the triangular wave 2, the flickering of the LED cannot be perceived by the human eye, and there is no problem of flickering of the lighting. Furthermore, by controlling the illumination adjustment signal input to the comparator 4, it is possible to adjust the illumination brightness without being restricted by the transmission data.

三角波生成回路を利用する本発明において、外部から供給されるクロックから三角波を生成せず、自身で三角波を生成する三角波生成回路を利用しても良い。 In the present invention using a triangular wave generating circuit, a triangular wave generating circuit that generates a triangular wave by itself without generating a triangular wave from an externally supplied clock may be used.

三角波生成回路を利用してLED駆動用信号を生成する本発明において、ノコギリ波生成回路を利用してLED駆動用信号を生成しても良い。 In the present invention in which the triangular wave generating circuit is used to generate the LED driving signal, the sawtooth wave generating circuit may be used to generate the LED driving signal.

LED駆動用信号を生成する本発明において、生成したLED駆動用信号でLEDを制御するスイッチを駆動しても良いし、LED以外の高速で点滅可能な照明器具を駆動しても良い。 In the present invention in which the LED drive signal is generated, the generated LED drive signal may drive a switch for controlling the LED, or may drive a lighting device other than the LED that can blink at high speed.

LED駆動用信号を生成する本発明において、生成したLED駆動用信号でLED以外の高速で点滅可能な発光装置、例えば液晶等を駆動しても良い。 In the present invention for generating an LED driving signal, the generated LED driving signal may be used to drive a light emitting device other than an LED, such as a liquid crystal, which can be blinked at high speed.

以上、本発明を実施するための形態について説明したが、本発明の技術的範囲は上記実施するための形態に記載の範囲に限定されるものではない。 Although the embodiments for carrying out the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments for carrying out.

本発明（可視光通信送信装置）はLED照明等を利用した可視光通信に対して利用することができる。 INDUSTRIAL APPLICABILITY The present invention (visible light communication transmitter) can be used for visible light communication using LED illumination or the like.

１ 三角波生成回路１
２ 三角波生成回路２
３ MUX（マルチプレクサ）
４ 比較器 1 triangular wave generation circuit 1
2 triangular wave generation circuit 2
3 MUX (multiplexer)
4 comparator

Claims (4)

外部から入力されるクロック波形を基に三角波を生成する第１の三角波生成回路と、外部から入力されるクロック波形を基に第１の三角波生成回路とは異なる周期の三角波を生成する第２の三角波生成回路と、前記各三角波生成回路の複数出力を外部から入力される送信データで１つの出力に選択するMUX（マルチプレクサ）と、前記MUXの出力と照度調整用信号からLED駆動用信号を生成する比較器を備えることを特徴とする可視光通信送信装置。 A first triangular wave generating circuit that generates a triangular wave based on an externally input clock waveform, and a second triangular wave generating circuit that generates a triangular wave with a period different from that of the first triangular wave generating circuit based on an externally input clock waveform. A triangular wave generating circuit, a MUX (multiplexer) that selects one output from the triangular wave generating circuit according to transmission data input from the outside, and an LED driving signal is generated from the output of the MUX and the illumination adjustment signal. A visible light communication transmitter, comprising: a comparator for 第１の三角波生成回路と、第１の三角波生成回路と同期し第１の三角波生成回路とは異なる周期の三角波を生成する第２の三角波生成回路と、前記各三角波生成回路の複数出力を外部から入力される送信データで１つの出力に選択するMUX（マルチプレクサ）と、前記MUXの出力と照度調整用信号からLED駆動用信号を生成する比較器を備えることを特徴とする可視光通信送信装置。 a first triangular wave generating circuit; a second triangular wave generating circuit that synchronizes with the first triangular wave generating circuit and generates a triangular wave having a period different from that of the first triangular wave generating circuit; Visible light communication transmitter, characterized by comprising a MUX (multiplexer) that selects one output from transmission data input from and a comparator that generates an LED drive signal from the output of the MUX and an illumination adjustment signal. . 外部から入力されるクロック波形を基にノコギリ波を生成する第１のノコギリ波生成回路と、外部から入力されるクロック波形を基に第１のノコギリ波生成回路とは異なる周期のノコギリ波を生成する第２のノコギリ波生成回路と、前記各ノコギリ波生成回路の複数出力を外部から入力される送信データで１つの出力に選択するMUX（マルチプレクサ）と、前記MUXの出力と照度調整用信号からLED駆動用信号を生成する比較器を備えることを特徴とする可視光通信送信装置。 A first sawtooth wave generation circuit that generates a sawtooth wave based on an externally input clock waveform, and a sawtooth wave with a period different from that of the first sawtooth wave generation circuit based on an externally input clock waveform. a second sawtooth wave generating circuit, a MUX (multiplexer) that selects one output from the plurality of outputs of each of the sawtooth wave generating circuits according to transmission data input from the outside, and the output of the MUX and the illuminance adjustment signal A visible light communication transmitter comprising a comparator for generating an LED driving signal. 第１のノコギリ波生成回路と、第１のノコギリ波生成回路と同期し第１のノコギリ波生成回路とは異なる周期のノコギリ波を生成する第２のノコギリ波生成回路と、前記各ノコギリ波生成回路の複数出力を外部から入力される送信データで１つの出力に選択するMUX（マルチプレクサ）と、前記MUXの出力と照度調整用信号からLED駆動用信号を生成する比較器を備えることを特徴とする可視光通信送信装置。 a first sawtooth wave generating circuit; a second sawtooth wave generating circuit that synchronizes with the first sawtooth wave generating circuit and generates a sawtooth wave having a period different from that of the first sawtooth wave generating circuit; It is characterized by having a MUX (multiplexer) that selects one output from the multiple outputs of the circuit according to the transmission data input from the outside, and a comparator that generates an LED drive signal from the output of the MUX and the illumination adjustment signal. visible light communication transmitter.
JP2022004052A 2022-01-14 2022-01-14 Visible light communication transmission device Pending JP2023103514A (en)

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