Switch Control Scheme to Mitigate Conducted Electromagnetic Interference Emission in Light Emitting Diode Driver

2015 ◽  
Vol 21 (10) ◽  
pp. 3261-3265 ◽  
Author(s):  
Mohammad Yanuar Hariyawan ◽  
Risanuri Hidayat ◽  
Eka Firmansyah
Keyword(s):  
Electromagnetic Interference ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Switch Control ◽  
Control Scheme

A Pathway for Information Transmission to the Ear

1995 ◽  
Vol 74 (9) ◽  
pp. 640-644 ◽  
Author(s):  
Ricardo Ferreira Bento ◽  
Aroldo Miniti ◽  
Tanit Ganz Sanchez ◽  
Adolfo Leiner ◽  
Carlos Augusto Nunes
Keyword(s):  
Tympanic Membrane ◽  
Hearing Aids ◽  
Electromagnetic Interference ◽  
Light Emitting Diode ◽  
Photovoltaic Cell ◽  
Small Power ◽  
Prosthetic Devices ◽  
Light Emitting ◽  
Implantable Hearing Aids ◽  
Audio Range

The use of implantable hearing aids and cochlear implants as an aid to neurosensory deafness is becoming an established procedure. The transmission of a processed speech signal is accomplished either transcutaneously via radiofrequency or percutaneously by connector coupling. Whereas the former is sensitive to electromagnetic interference, the latter increases the risk of infection. To overcome these disadvantages, an infrared (IR) system for transmission through the tympanic membrane was devised and tested. The transmitter/receiver consisted of an IR light emitting diode (LED;920nm) and a photovoltaic cell. The LED was placed inside the auditory canal of four dogs and the photovoltaic cell in the tympanic cavity over the cochlear promontory. A sinusoidal signal modulation was applied to the LED. The emitted signal was detected undistorted after crossing the tympanic membrane, with an average absorbance of 20%. High-frequency cut-off was adequate for cochlear implant purposes and audio prosthetic devices in general. The authors conclude that the tympanic membrane may be used as a translucent sealed interface to transmit data in the audio range to the middle and inner ears, with small power loss, good frequency response, and immunity to interface.

Stabilization Control of Complex Dynamics of Light-Emitting Diode System Based on LaSalle Invariant Principle

2012 ◽  
Vol 485 ◽  
pp. 570-573
Author(s):  
Hai Long Duan ◽  
Yu Liang Liu ◽  
Chun Xiao Han ◽  
Yan Qiu Che
Keyword(s):  
Explicit Knowledge ◽  
Complex Dynamics ◽  
Light Emitting Diode ◽  
Equilibrium Points ◽  
Light Emitting ◽  
Stabilization Control ◽  
Control Scheme ◽  
Lasalle Invariant Principle ◽  
Diode System ◽  
Invariant Principle

Light-emitting diodes with optoelectronic feedback loop display complex sequences of periodic mixed mode oscillations and chaotic spiking. In this paper, we propose an adaptive control scheme for the stabilization of this complex dynamics, which is based on LaSalle invariant principle. The controller can asymptotically stabilize unstable equilibrium points of dynamical systems without explicit knowledge of the desired steady-state position. The simulation results demonstrate the effectiveness of the proposed control scheme.

Chaos Synchronization of Two Light-Emitting Diode Systems with Complex Dynamics via Adaptive Neural Control

2013 ◽  
Vol 344 ◽  
pp. 170-173
Author(s):  
Chun Xiao Han ◽  
Xiao Qin Li ◽  
Ting Ting Yang ◽  
Rui Xue Li
Keyword(s):  
Chaos Synchronization ◽  
Neural Control ◽  
Complex Dynamics ◽  
Light Emitting Diode ◽  
Lyapunov Stability Theory ◽  
Adaptive Neural Control ◽  
Light Emitting ◽  
Control Scheme ◽  
Complex Sequences ◽  
Error Dynamics

Light-emitting diodes with optoelectronic feedback loop display complex sequences of periodic mixed mode oscillations and chaotic spiking. In this paper, we propose an adaptive neural control scheme for chaos synchronization of two unidirectional coupled LED systems. Based on Lyapunov stability theory, the controller can stabilize the synchronization error dynamics at the origin point, thus chaos synchronization can be obtained. The simulation results demonstrate the effectiveness of the proposed control scheme.

scholarly journals Lighting Control via Magnetic Field Communication

Inventions ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 70
Author(s):  
Jia-Jing Kao ◽  
Chun-Liang Lin ◽  
Chih-Cheng Huang ◽  
Chung-Hsin Huang
Keyword(s):  
Magnetic Field ◽  
Light Emitting Diode ◽  
Digital Data ◽  
Frequency Change ◽  
Light Emitting ◽  
Lighting Control ◽  
Control Scheme ◽  
Shift Keying ◽  
Potential Applications ◽  
The Cost

This invention proposes a novel light emitting diode (LED) lighting (dimmable) control scheme to transmit digital data through a magnetic field generated by a flyback driver that utilizes digitized data to adjust the brightness of LEDs for potential applications. This design would eliminate the cost of establishing wireless transmission hardware by simply relying on the magnetic field for communication to meet the management of the lighting control system. The method used a frequency-shift keying (FSK) technique on the secondary side of the system to send digitized data to the primary side. The primary side of the system interpreted the control commands by detecting the frequency change, and the corresponding lighting control was decoded. The inner communication connected the primary and secondary sides to the transformer through wirelessly transmitted data, which eliminated the requirements of optical coupling and peripheral circuits. For extended applications, the designed system can be combined with sensors at home for lighting management with the benefits of energy saving and potential emergency warnings.

Evaluation of a daylight-responsive, iterative, closed-loop light control scheme

2019 ◽  
Vol 52 (2) ◽  
pp. 257-273
Author(s):  
PK Maiti ◽  
B Roy
Keyword(s):  
White Light ◽  
Laboratory Testing ◽  
Closed Loop ◽  
Light Emitting Diode ◽  
Light Control ◽  
In Situ Testing ◽  
Light Emitting ◽  
Colour Temperature ◽  
Control Scheme

In this paper an iterative, closed-loop light control scheme is proposed and evaluated by a white light emitting diode-based, daylight-responsive luminaire to follow the time-varying pattern of correlated colour temperature and illuminance of a daylight scene. The proposed control scheme functions primarily with the response signals of two RGB colour sensors, viz., a daylight sensor to monitor the daylight scene at the window plane and an internal light sensor to monitor the light scene created by the test white light emitting diode luminaire. The control scheme controls the lumen delivery of individual light emitting diode arrays of the test luminaire by adjusting the duty cycles to follow the instantaneous correlated colour temperature of daylight and at the same time to respond to the variation of window plane illuminance in the reverse pattern. Evaluation is conducted by laboratory testing and in situ testing. The maximum deviations in correlated colour temperature, illuminance and chromaticity from the required values under laboratory testing and in situ testing are found to be [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], [Formula: see text], [Formula: see text] respectively, which establish the acceptable performance of the proposed iterative light control scheme.

Synchronization of Chaotic Quantum Dot Light Emitting Diodes under Optical Feedback Effect

2020 ◽  
pp. 144-148
Keyword(s):  
Quantum Dot ◽  
Delay Time ◽  
Chaos Synchronization ◽  
Optical Feedback ◽  
Light Emitting Diode ◽  
Feedback Effect ◽  
Complete Synchronization ◽  
Light Emitting ◽  
Coupling Methods ◽  
Coupling Parameters

Chaos synchronization of delayed quantum dot light emitting diode has been studied theortetically which are coupled via the unidirectional and bidirectional. at synchronization of chaotic, The dynamics is identical with delayed optical feedback for those coupling methods. Depending on the coupling parameters and delay time the system exhibits complete synchronization, . Under proper conditions, the receiver quantum dot light emitting diode can be satisfactorily synchronized with the transmitter quantum dot light emitting diode due to the optical feedback effect.

Sign in / Sign up

Export Citation Format

Share Document