Query: POWER SUPPLY CIRCUITS IN LED LAMPS

Candidate papers:

abstract: Load resistance and line voltage impact on electric parameters of power supply circuits used in LED lamps are discussed in this paper. Investigations were performed for two power supplies typically used in CLA25 and CLA60 lamps offered by OSRAM Semiconductor. Measurements were performed for load resistance ranging from 10 O to 10 kO and for the alternating input voltage of line frequency and RMS value ranging from about 10 V to 230 V. The impact of power supplies of LED lamps on deformation of the current drawn from the network was also analysed.
author_names: Przemyslaw Ptak

Krzysztof Gorecki

Janusz Zarebski
title: Power supply circuits used in LED lamps
year: 2016

abstract: LED lamps are widely used in household, nonetheless they are still non linear. Therefore, LEDs need a power supply system to correcting their operation, which introduces nonlinearities into the electrical grid and distortions on waveform. Then analysis and quantification of electrical signals is becoming a key issue. This work presents a spectral analysis of analysis of electric current signal in LEDs lamps which yields a novel collection of characteristics and measures to quantify the waveform quality. In particular, periodogram and Fourier transform are considered. For experiments, two circuits are considered: one that corresponds to the commercial LEDs lamp connected to AC source and another one incorporating a power factor corrector. Experimentally, the usefulness and applicability of proposed characteristics is proved.
author_names: Diego Hernan Peluffo-Ordonez

Edgardo Javier Revelo-Fuelagan
title: Novel spectral characteristics of the electrical current waveform to quantifying power quality on LED lamps
venue: 2014 XIX Symposium on Image, Signal Processing and Artificial Vision
year: 2014

abstract: Today,although the application of high power LED Lamps is more and more popular,the singleLamp working voltage is only about 3. 3 V and with a luminous intensity strongly related to the working current. To make the LED Lamp to work in different voltages,different Controlling Circuits and Controlling ICs emerge as the times require. constant current driving Integrated Circuit Chip QX9910 is widely used in the commercial 220 V power supply system due to its low Power,high control precision,large Tuning Range of Pulse width and low cost,but it still needs to be improved for its imperfect typical application circuit and the resulted seriously heating.
author_names: Wan Wenjian
title: Improving of IC QX9910 with Constant Current Driving in the Typical Application Circuit of Normal High power LED Lamps
year: 2014

abstract: LED lamps are widely used in household, nonethe less they are still non linear. Therefore, LEDs need a power supply system to correcting their operation, which introduces nonlinearities into the electrical grid and distortions on wave form. Then analysis and quantification of electrical signals is becoming a key issue. This work presents a spectral analysis of analysis of electric current signal in LEDs lamps which yields a novel collection of characteristics and measures to quantify the waveform quality. In particular, periodogram and Fourier transform are considered. For experiments, two circuits are considered: one that corresponds to the commercial LEDs lamp connected to AC source and another one incorporating a power factor corrector. Experimentally, the usefulness and applicability of proposed characteristics is proved.
author_names: versidad Cooperativa de Colombia

Ernesto Javier Paspuel Revelo
title: Novel spectral characteristics of the electrical current waveform to quantifying power quality on LED lamps
year: 2014

abstract: The increased popularity of LEDs has challenged LED lighting technology to come up with efficient and cost effective solutions on the design of driver circuits. LED driver circuit uses buck, boost and buck boost converters as switching power a conversion circuit which acts as a constant current source for LED lamps. These converters process a large amount of power during current regulation and hence they are inefficient. In this paper, we propose a highly efficient driver circuit with a fly back converter as current regulator. The fly back converter is placed between the dc source and the LED lamp. It uses only a partial power for current regulation and hence the efficiency is improved. Simulation results of open loop highly efficient LED driver with fly back converter as current regulator is presented in this paper.
author_names: V T Sreedevi

V Kamala Devi

Ahire Akanksha Sunil
title: Analysis and simulation of a single stage power supply for LED lighting
venue: 2013 International Conference on Green Computing, Communication and Conservation of Energy (ICGCE)
year: 2013

abstract: High power white light emitting diode (LED) has attracted a lot of attention from both industry and academia for its high efficacy, simple to drive, environmentally friendly, and long lifespan. It becomes possible applications to replace the incandescent bulbs and fluorescent lamps in residential, industry and commercial lighting. As a result of light emitting diodes with a save electricity, environmental protection, long life, fast response speed, etc. Future will replace the traditional light emitting components into a new light source, so this study will also be LED lighting for the light source for optical analysis. This paper uses constant current IC circuits to provide the stable forward current for LED and achieve the brightness consistency. Finally, we employ the experiments to validate the characteristics of the lamp developed in this paper.
author_names: Wen-Bin Lin
title: The Fabrication of LED Lighting with Uninterruptible Power Supply Function
year: 2014

abstract: The utility model relates to an LED (light emitting diode) illumination power supply and drive control system, which comprises a switch power supply, LED lamps and LED control switches, wherein the switch power supply is arranged inside a distribution box or outside the distribution box; the alternating current input end of the switch power supply is connected with a 220V alternating current power supply through a breaker in the distribution box; the direct current safety voltage output end of the switch power supply is connected with main circuits leading to various rooms; and LED control switches of various rooms and the LED lamps in the rooms are connected to DC+ and DC of the main circuit in series. By using the LED illumination power supply and drive control system provided by the utility model, a potential safety hazard problem and a problem that in the prior art, because the 220V alternating current directly enters into the LED lamp, the drive power supply and the LED lamp are centralized so that heat dissipation is difficult are solved; and moreover, the cost of the LED lamps is lowered. An LED drive controller can perform diming control to the LED lamp on the existing arranged illuminating circuit, thus the popularization of LED illumination under the existing conditions can be prompted.
title: LED (light emitting diode) illumination power supply and drive control system
year: 2011

abstract: The invention provides an LED drive circuit and a power supply circuit and an LED lamp thereof, which are suitable for the field of LED lamps. The power supply circuit of the LED drive circuit comprises a transient power supply unit and a steady state power supply unit. In the embodiment of the invention, the transient power supply unit supplies power to a PFC (Power Factor Correction) control circuit and a PWM (Pulse Width Modulation) control circuit by utilizing voltage output by the rectifier bridge of the LED drive circuit, whereas the steady state power supply unit supplies power to the PFC control circuit and the PWM control circuit by utilizing voltage output by the transformer of the LED drive circuit. The power supply circuit has simple structure and low cost, and when the rectifier bridge does not have output, the power supply circuit stops supplying power to the control circuits, and thereby, the electric energy is greatly saved.
title: LED (light emitting diode) drive circuit and power supply circuit and LED lamp thereof
year: 2010

abstract: The present invention is applicable to the field of LED lighting, there is provided a power anti reverse circuit, LED lamps and LED lighting circuits, power supply circuit includes an anti reverse switching device and a bias voltage module. In the present invention, the anti reverse power supply circuit using MOS transistor as a switching device, when the power is reversed, the use of the switching characteristics of MOS tube LED lamps disconnect the power path of the circuit, and thus play a role in anti reverse power, and due to the small MOS tube resistance, low pressure drop, so its small power consumption.
title: Circuit for preventing reverse connection of power supply, LED lamp circuit and LED lamp
year: 2010

abstract: This paper presents input EMI filter and damping circuits for phase dimmable LED lamps. An input EMI filter is implemented as part of LED lamp power supplies to comply with conducted emission standards set by regulatory agencies. The use of conventional EMI filter configurations are limited in this application due to the absence of earth (chassis) connection and the presence of stringent mechanical size constraints. This paper describes alternative EMI filter topologies suitable for 2 wire input connections present in Edison or Bayonet sockets. Criteria for achieving dimmer compatibility are introduced and the impact of an EMI filter on phase dimming operation is studied. The influence of different damping networks on transient performance of systems is analyzed using pole zero mapping techniques and minimum damping requirements are established. A step by step procedure for EMI filter and damping network design is outlined and verified for a 16 W, 230 VAC LED power supply example based on a discontinuous conduction mode (DCM) Flyback topology.
author_names: Montu Doshi

James Patterson
title: Input filter design for TRIAC dimmable LED lamps
venue: 2013 IEEE Energy Conversion Congress and Exposition
year: 2013