The Research and Design of the Adaptive Automotive Headlamps Based LED System

2015 ◽  
Vol 742 ◽  
pp. 753-757
Author(s):  
Xu Sen Zhao ◽  
Shuo Bai
Keyword(s):  
Light Intensity ◽  
Power Supply ◽  
Analog Circuit ◽  
High Efficiency ◽  
Boost Converter ◽  
The Self ◽  
Experimental Results ◽  
Control Scheme ◽  
Self Adaptation ◽  
Research And Design

A new control scheme with self-adaption is put forward in this paper. The digital control and the analog circuit are combined. A light intensity sensor can be implemented with a photoelectric triode. This sensor makes the self-adaptation control of LED possible. As a result, the light of LED can be adjusted automatically with a PWM chopper according to the ambient brightness. The whole system’s power supply is from a Boost converter which has a high efficiency. In addition, This combination improves the hommization of the system and solves the problems existing incurrent headlamps, unsafe factors are also reduced. The validity of design is verified by experimental results.

scholarly journals Simple control scheme buck-boost DC-DC converter for stand alone PV application system

2019 ◽  
Vol 10 (2) ◽  
pp. 1090
Author(s):  
M. Z. Zulkifli ◽  
M. Azri ◽  
A. Alias ◽  
Md. H. N. Talib ◽  
J. M. Lazi
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
High Intensity ◽  
Low Voltage ◽  
Real Life ◽  
Boost Converter ◽  
Integration System ◽  
Application System ◽  
Pv Panel ◽  
Control Scheme

In this paper a buck-boost dc-dc converter for pv application is proposed, which is mainly composed of a buck – boost converter, PV panel, load and a battery. Existing dc-dc converter can convert the power from the PV panel, but unfortunately the PV panel can only provide power when there is a high intensity of light. In order to provide power supply to the load without any interruption, buck-boost dc-dc converter is introduced. The power intermittency issue of PV panel can be overcome with the aid of a secondary supply which is in this case, the batter. The integration system between the primary and the secondary supply is controlled by a simple proposed control scheme. Battery act as a power in the low voltage side while PV panel is taking over in the high voltage side. Buck-boost converter is operated either is buck or boost mode according to the performance of the PV panel. This paper is presented the simple control scheme to decide the mode suitable for the buck and boost mode. Various conditions are simulated to verify the working operation of the buck-boost converter and to representing solar panel in real life. Simulation and experimental are carried out to verify the system.

scholarly journals DC-DC Buck Boost Converter For Renewable and Biomedical Application based Real-Time IoT

2019 ◽  
Vol 8 (4) ◽  
pp. 328-336
Keyword(s):  
Pulse Width ◽  
High Efficiency ◽  
Boost Converter ◽  
Heart Beat ◽  
Current Control ◽  
Buck Converter ◽  
Raspberry Pi ◽  
Control Line ◽  
Light Load ◽  
Control Scheme

DC-DC buck boost converter is a conversion circuit using induced frequency inductors, switching.DC-DC converters dynamics was improved by using self calibrated preemptive current control. As, a result Preemptive concurrent control reduces capacitor size by 10x.DC DC buck converter with pulse width modulation.DC-DC buck converter with two step pulse width modulation was utilized for low power application by using delay, control line. Main motive of DC-DC buck converter with pulse width modulations obtains high linearity, high granularity. Conversion efficiency for Light load current was increased in buck converter by clocked hysteresis scheme. Power supplied to comparator was scaled to load easily. Conventional buck converter was integrated with LED to expand smart bulb. Main power from supply was decoupled by Non linear ramp control scheme preventing LED output flickering. Control scheme effectiveness was improved by small signal model. Three major characteristics of Light emitting diodes are improved lifetime, high efficiency, increased reliability, controllability. High brightness LED by multicell three phases was used for its lower cost. Heart beat was identified by using raspberry pi, system on chip with three stages in it namely Heart beat determination, Impedence, cardiography parameters. Accidents was restricted by this method.Overspeeding vehicles was identified was main goal of using complex proportional assessment method. Converting Rice husk into bio fuels was performed by thermo chemical processes. Rice hulk silica was utilized for fluorescent silica particles synthesis.

Research and Design of a 100W Adapter Applicable to Laptop

2014 ◽  
Vol 971-973 ◽  
pp. 1206-1209
Author(s):  
Ying Ying Song ◽  
Hong Min Wang ◽  
Ling Yu ◽  
Feng Wu Su
Keyword(s):  
Power Factor ◽  
High Power ◽  
Power Factor Correction ◽  
Current Mode ◽  
Boost Converter ◽  
Experimental Results ◽  
Two Stage ◽  
Voltage Range ◽  
High Power Factor ◽  
Research And Design

A 100W adaptor with universal voltage range 90-265VAC input and 20V/5A output is designed in this paper .The prototype adopted a new level two-stage high power factor power adapter, the PFC(Power Factor Correction) is a Boost converter operating in discontinuous current mode boundary,and the DC/AC using flyback converters. The experimental results showed that the effectiveness of the proposed approach.

Design of High-Power LED Embeded Controller Based on FSCQ0765RT

2012 ◽  
Vol 512-515 ◽  
pp. 2701-2704
Author(s):  
Yi Min Wang ◽  
Jian Wen Li
Keyword(s):  
Light Intensity ◽  
Power Factor ◽  
High Power ◽  
Power Supply ◽  
High Efficiency ◽  
Switching Power Supply ◽  
Constant Voltage ◽  
Switching Power ◽  
High Power Factor ◽  
Street Lamp

This paper designs a type of intelligent switching power supply controller for LED street lamp. The configuration and principle of the controller is detailedly analyzed in this paper. Microprocessor PIC12F675 is employed in the design. With the controller, According to defferent illumination requirements, the controller achieves constant voltage and different constant LED current is automatically regulated to achieve energy saving without LED light intensity decrease notably. The controller is easy to be realized in circuit with high efficiency and high power factor.

scholarly journals Experimental prototype for PWM – Based Sliding Mode Boost Converter

2011 ◽  
Vol 7 (1) ◽  
pp. 35-41
Author(s):  
R. A. Abdulhalem ◽  
Haroutuon Hairik ◽  
Asmaa Kadhem
Keyword(s):  
Pulse Width Modulation ◽  
Sliding Mode ◽  
Experimental System ◽  
Voltage Regulation ◽  
Boost Converter ◽  
Experimental Results ◽  
Experimental Prototype ◽  
Control Scheme ◽  
Dynamic Performances ◽  
Conduction Mode

The paper dells with a modified experimental prototype for pulse-width modulation (PWM) sliding mode control (SMC) applied to a DC-to-DC-boost converter operated in continuous conduction mode (CCM). Experimental results show that the proposed control schme provides good voltage regulation and is suitable for common DC-to-DC conversion purposes. The prototype and its implementation are given in detail. The static and dynamic performances of the The static and dynamic performances of the experimental system are recorded. Experimental results show that the proposed control scheme provides good voltage regulation and is suitable for common DC-to-DC conversion purposes.

Oscillation Loop for a Vibratory Gyroscope and Its Experiment Study

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Liu Heng ◽  
Su Wei ◽  
Zhang Fu-tang
Keyword(s):  
Signal To Noise Ratio ◽  
Gain Control ◽  
The Self ◽  
Experimental Results ◽  
Velocity Amplitude ◽  
Vibratory Gyroscope ◽  
Gyroscope System ◽  
Control Scheme ◽  
Oscillation Loop ◽  
The Stability

This paper investigates the design of a self-oscillation loop for the gyroscope system. The dynamic equations describing this system are analyzed using the method of averaging, and a criterion for selecting the circuit parameters is established based on the analysis. The validity of the criterion and the effectiveness of the control scheme are verified by the experimental results obtained from the control parameters that satisfy or violate the stability criterion. The performance of the self-oscillation loop with a z-axis gyroscope is also evaluated in light of the experimental results. The self-oscillation loop based on the auto gain control scheme effectively tracks the resonance frequency of a z-axis gyroscope. This frequency corresponds to a standard Allan variance of 0.04 Hz in 8 min at natural frequency. The output signal-to-noise ratio (SNR) is about 90 dB, and the vibratory velocity amplitude shows a deviation of 0.5% in 8 min.

Design of a high efficiency and low EMI boost converter using bi-frequency PFM control scheme

2015 ◽  
Vol 85 (3) ◽  
pp. 473-480
Author(s):  
Changyuan Chang ◽  
Chengèn Wu ◽  
Yubo Yuan ◽  
Junjie Hu ◽  
Bin Bian
Keyword(s):  
High Efficiency ◽  
Boost Converter ◽  
Control Scheme
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