Broadband over Visible Light: High power wideband bias-T solution

Stratil, Tomas; Koudelka, Petr; Jankovych, Jakub; Vašinek, Vladimír; Martínek, Radek; Pavelek, Tomáš

doi:10.1109/csndsp.2016.7574002

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…As the outputs of the Class E amplifiers are not connected together and the load is an LED string, the impedance sees by the amplifiers is known and constant, therefore the condition of Zero Voltage Switching (ZVS) of each amplifier does not depend on the other RFPA, thereby simplifying the overall design. In a typical VLC system, the LED strings is connected using a bias T [25]. The bias T is used to connect the amplifier and the DC/DC together, blocking the DC component to go to the amplifier (using a series capacitor) and the signal components to go to the DC/DC converter, using an inductor.…”

Section: Leds Class E Rfpa1mentioning

confidence: 99%

Taking Advantage of the Sum of the Light in Outphasing Technique for Visible Light Communication Transmitter

Aller

Lamar²,

Miaja³

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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Visible Light Communication (VLC) takes advantage of the widespread use of the LEDs, and by modifying the driver stage, the LEDs are capable of lighting and transmitting information. One of the main drawbacks is the low power efficiency due to the modification of the LED driver stage in order to add the communication capability. Most of the research work related to VLC is towards the communication task, whereas there is a limited work about the improvement on the power efficiency. This paper proposes a high efficiency LED driver for VLC working as a transmitter based on the outphasing technique. This technique is used also in RF communications and increases the efficiency of the amplifiers. The proposed transmitter is made up of two switching-mode power amplifiers that reproduce the signals required for the outphasing technique and a DC/DC converter that biases the LEDs. The proposal exploits the light and, instead of being added electrically, the signals are added in their light form, which leads to a reduction in the complexity of the design. As experimental results, a transmitter was built of two Class E amplifiers reproducing a 16-QAM modulation, achieving a signal-generation efficiency of 78% and an overall efficiency of 92%.

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Section: Leds Class E Rfpa1mentioning

confidence: 99%

Taking Advantage of the Sum of the Light in Outphasing Technique for Visible Light Communication Transmitter

Aller

Lamar²,

Miaja³

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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show abstract

“…Figure 1a illustrates the realized bias tee which is a three-port network used to set the DC bias point of certain electronic components without disturbing other components. The equivalent circuit model is represented in Figure 1b where the low-frequency port is used to define the polarization; the high-frequency port passes the data signals but blocks bias levels; the combo port is connected to the device, which can provide both polarization and data signals [16] (see Figure 1b). Back to LFR measurements, in our study, each LED are biased at 100 mA.…”

Section: Vlc Channel Modelmentioning

confidence: 99%

VLC Modelization for VLC-PLC System: Evaluation of Optical, Electrical, and Frequency Behavior

Yaacoub

Nouvel

Haese

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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The integration of powerline communication (PLC) with visible light communication (VLC) has attracted the attention of many researchers. Cascading these two techniques offers the possibility of performing a wired transmission over existing powerline infrastructure and a last-mile energy-efficient wireless transmission through pre-installed LEDs for indoor illumination. Therefore, VLC should be deeply analyzed to optimize its integration with other systems. So far, most research has only modeled the channel and modulation bandwidth of the VLC system. However, the electrical and optical aspects are rarely taken into account and there is no explicit expression of the received signal as a function of that emitted. So in this paper, An explicit expression is proposed allowing a direct calculation of the photo-current as a function of the transmitted current taking into account the optical, electrical, and frequency behavior of the VLC system. This expression is validated using measurement results.Index Terms-VLC channel, LED frequency response, optical power, photo-current.

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“…Multiple methods have been proposed to integrate VLC into LED luminaires. Though inefficient, the bias-T is an example of an external modulation approach [7]. Direct modulation of LED outputs has also been proposed (e.g., [8]).…”

Section: Introductionmentioning

confidence: 99%

Light-Emitting Commutating Diodes for Optical Wireless Communications Within LED Drivers

et al. 2020

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Although visible light communication (VLC) systems provide high density links for use in Internet-of-Things (IoT) devices, the design of high rate VLC transmitters that maintain luminaire efficacy is an open problem. In this article, a novel approach to the integration of VLC within light-emitting diode (LED) drivers is proposed through the replacement of freewheeling/blocking diodes with light-emitting devices termed a light-emitting commutating diodes (LECDs). In this manner, communications and illumination can be provided using a simple, cost effective design while employing no additional components. The subtle change of LED driver control signals facilitates the transmission of data from LECDs while simultaneously supporting illumination functions. Lighting controls such as dimming are maintained and combined with modulation through the use of overlapping pulse position modulation (OPPM) and performance is quantified. Prototype buck and boost converters with LECDs are implemented and their efficacy is measured. Though current commercial LEDs are not intended for such signalling applications, we experimentally demonstrate their feasibility in this application and suggest methods to make such converters reliable. It is demonstrated that the addition of an LECD improves the efficacy of the luminaire as compared to conventional LED drivers while simultaneously enabling a VLC downlink.

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Broadband over Visible Light: High power wideband bias-T solution

Cited by 7 publications

References 9 publications

Taking Advantage of the Sum of the Light in Outphasing Technique for Visible Light Communication Transmitter

Taking Advantage of the Sum of the Light in Outphasing Technique for Visible Light Communication Transmitter

VLC Modelization for VLC-PLC System: Evaluation of Optical, Electrical, and Frequency Behavior

Light-Emitting Commutating Diodes for Optical Wireless Communications Within LED Drivers

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