Dehumidification needs are increasing reduced sensible loads means lower shr. Load diversity thus, the statewide peak demand is less than the sum of the individual peaks actual statewide peak demand can be calculated by summing up the load levels of all utilities for each hour of the year diversity factor is an indication of the level of load diversity. Abstractthe efficiency of asynchronous motor is higher near the rated working point, but it will decrease significantly under light load. The approximate optimal flux is obtained according to the loss model method and the convergence speed is. The new optimos ir3887m, ir3889m, ir3888m integrated pointofload dcdc voltage regulator family is an easytouse, fully integrated and highly efficient dcdc regulator that can operate from an input voltage of 12 v 4. The objective of this paper is to discuss design methods for sustainable, high performance facades, and the necessary steps in ensuring that the environmental factors and energy efficiency strategies are. In order to achieve higher efficiency during light load conditions, a new approach is proposed in this paper. Request pdf lightload efficiency optimization method a method of maintaining high powerconversion efficiency across the entire load range and its circuit implementations are described. Therefore, equivalent power loss model contains the two kinds of losses.
Efficiency improvement for switching power supply at light. Howto improve buck converter light load efficiency with an. Proposed method efficiency degradation this paper discussed how to improve the efficiency of power supplies at half load and light load under 20% using digital control. Current organic light emitting diodes oleds suffer from the low light extraction efficiency. Find materials for this course in the pages linked along the left. A twostage optimization method to optimize power converter \ud efficiency from light load to full load is proposed. Efficiency optimization of induction motor drive using. Index termslowpower smps, efficiency optimization digital control. Most electric motors are designed to run at 50% to 100% of rated load. There is no oscillation of magnetization flux which is characteristic of the search algorithms figures 4 and 8. Pdf twostage optimization method for efficient power. Even though power factor control implementation is so simple because of not requiring speed. The simplest method to improve efficiency of induction motor is to operate at light load and keep the motor in star connection which results in reduction of power consumption.
Lightload efficiency optimization method request pdf. However, in the design of automatic transmission, these two requirements are. Air flow optimization and calibration in highcompression. This paper discusses design methodologies for automatic transmission of vehicles to achieve light weight and low radiated noise. Efficiency optimization controllers a vf control, b loss model based pso controller, c search controller controller the terminal impedance and hence power factor and efficiency remain constant at optimal values irrespective of load 18. The pfc controller adjusts the output voltage for wide input power range in order to achieve the best efficiency for particular output load value. Efficiency improvement at light load condition is challenging since the converter operates at lower phase shift ratio and the current stress is higher, which leads to more losses. Singlephase pwm controller with lightload efficiency. Singlephase pwm controller with lightload efficiency optimization datasheet. Efficiency is the driving force in reducing operational costs and optimization is the engine with which to achieve this goal. Semibirdge system efficiency diode 200 400 600 800 1 000 1 200 output powerw 1. Mosfet improves light load efficiency of the pfc converter. Study on the strategies to enhance the efficiency of.
These methods improved light load efficiency, but there are many side effects such as high cost, complex control, and large conduction losses in body diodes of sr. As nouns the difference between efficiency and optimization is that efficiency is the extent to which time is well used for the intended task while optimization is the design and operation of a system or process to make it as good as possible in some defined sense. Lightload efficiency optimization method 2009 twenty. When the motor runs in star mode, the voltage applied to stator phase winding is reduced by the factor of 3.
The waveforms of hv bridge voltage vhv, lv bridge voltage vlv and inductor current il are shown under both high and lightload conditions. Note that the optimization scheme is applicable for both charging and discharging operations. An optimization algorithm is a procedure which is executed iteratively by comparing various solutions till an optimum or a satisfactory solution is found. Luminous efficiency an overview sciencedirect topics. Lightload efficiency improvement by extending zvs range in. Nowadays, high efficiency is required over a wide load range, e. Max77812 20a userconfigurable quadphase buck converter.
After the connection has been made such that the optimization software can talk to the engineering model, we specify the set of design variables and objectives and constraints. Optical simulation and optimization of light extraction. V tps53211 is a single phase pwm controller with in integrated highcurrentdrivers. January 2012 doc id 184 rev 2 2 32 l6738a singlephase pwm controller with lightload efficiency optimization features flexible power supply from 5 v to 12 v bus power conversion input as low as 1.
The optimization procedure first breaks the converter design variables into many. A conceptual block diagram of the proposed lightload efficiency optimization method is shown in fig. Efficiency optimization methods are described for light and heavy load scenarios. The method of calculating the utilization factor uf is detailed in lighting design books, although lighting manufacturers catalogues give factors for. These losses are minimized by periodically turning off and on the power converter. Computeraided design optimization is developed in this research work, to optimize offline power converter efficiency from light load to full load. Citeseerx lightload efficiency optimization method. In optimization of a design, the design objective could be simply to minimize the cost of production or to maximize the efficiency of production. It is therefore important to optimize the efficiency of electrical drive systems under light load condition. The control system stability is higher and the optimization performance has been significantly improved. Efficiency optimization general description the rt8123a is a high efficiency single phase synchronous buck dcdc controller with 5v12v supply voltage.
This method is based on a simple induction motor field oriented control model includes iron losses uses only conventional im parameters. The solution for these losses on the secondary side is to use synchronous rectification instead of conventional rectifiers schottky diode. The potential light use efficiency of the vascular plants is assumed to be 2. Computeraided design full load efficiency light load efficiency optimization power converter. A hybrid search method is proposed to optimize the efficiency of asynchronous motor drive by current source at the light load operating condition. Assuming linear transitions between maximum and minimum inductor current, for an srbc operating in continuous conduction mode ccm is given. Study of efficiency optimization method based on optimal. Light load thd and efficiency optimization of digitally controlled pfc. The efficiency of the planning department is deplorable. Also, this hybrid method shows good dynamic performances and no sensitivity to parameter changes figure 9. Programmable startupshutdown sequence and userselectable phase configurations make the max77812 ideal for powering the latest generations of processors.
Twostage optimization method for efficient power\ud. Index terms efficiency optimization, light load, maximum efficiency, power management. Computeraided design optimization is developed in this research study, to optimize offline power converter efficiency from light load to full load. Also, at the valley of the voltage, the inductor current returns back from negative to zero. Optimization and control of power flow in distribution. Pdf studies of efficiency optimization methods based on. The primary design objective is to maintain the load at the peak of the efficiency. Light use efficiency an overview sciencedirect topics. Product brief optimos ipol voltage regulators with fast cot.
This improves the light load thd of the input current. Light load thd and efficiency optimization of digitally. The temporary energy storage and power conditioning block in fig. Ieee power electronics letters 1 a constantfrequency method. Aug 26, 2014 howto improve buck converter light load efficiency with an ldo part 1 designing a dcdc converter that only consumes micro amps of current at no load can be compared to fueling a muscle car with lighter fluid you may get it to work, but it wont be easy. This paper proposes a control scheme based on search method taking advantage of the. Maximum efficiency is usually near 75% of rated load. The proposed method substantially increases the conversion efficiency at light loads by minimizing switching and driving losses of semiconductor switches, as well.
Conventional method pfc fixed link voltage pwmfixed frequency dcdc pwmfixed frequency proposed method pfc variable link voltage pwmvariable frequency. Lightload efficiency improvement using load adaptive gate. Index termsefficiency optimization, lightload efficiency, ef ficiency measurement. Lightload efficiency optimization method ieee journals. Efficiency however decreases for higher output currents as the secondary rms current reaches a high level. When pref changes from 40% to 30% of pmax, the operating waveform of dab is shown in fig. The converter can deliver up to 25ma and generates output voltages from 0. A twostage optimization method to optimize power converter efficiency from light load to full load is proposed. In addition, quietness is another requirement for comfortable drive. It forces the input current to follow the input voltage, so that any electrical load appears like a resistor to the voltage source that powers it. Pdf efficiency optimization design of llc resonant. With the expectation to achieve high efficiency at ultra light load, the green mode operation of llc resonant converters is addressed. If the mosfet is turned on exactly at this point, the effect of resonant current on the inductor switching current is minimized. In literature, fuzzy logic and genetic algorithms have been used for efficiency optimization of induction motor drives.
In this paper, a method of maintaining high powerconversion efficiency across the entire load range and its circuit implementations are described. If load torque has a value close to nominal or higher, magnetizing flux is also nominal regardless of whether an algorithm for efficiency optimization is applied or not. Furthermore, it is not conducive to obtaining the methods of improving efficiency under light load. An optimization routine was used to determine a combination of intake and exhaust cam timing, light load internal egr, and cegr flow rates while satisfying the constraints of engine knock, brake torque and other functional requirements. Mulligan et al constantfrequency method for improving lightload efficiency 3 fig. The max17530 high efficiency, highvoltage, synchronous stepdown dcdc converter with integrated mosfets operates over a 4v to 42v input. Lightload efficiency optimization method researchgate.
Method description the proposed method of lightload efficiency optimization is based on a simple observation that the minimization of. With this tool, the efficiency optimization of the llc resonant converter can be made according to efficiency requirement over a wide load range. The method can be adapted for autonomous efficiency optimization. A load adaptive automatic switching frequency selection scheme is proposed to improve the power efficiency of a switching buck converter at light load condition.
After a new execution of the process chain, you can always use the following note, to be sure that the light optimization was sucessuful. Intelligent pfc management offers optimum power efficiency. Request pdf lightload efficiency optimization method in this paper, a method of maintaining high powerconversion efficiency across the. When discussing workforce management solutions, the first thing to discuss is the return on investment roi. The extent to which time is well used for the intended task.
Simple hybrid model for efficiency optimization of induction. Ac cycle skipping improves pfc light load efficiency for power supplies with an input power of 75 watts or greater, power factor correction pfc is usually required. The dynamically adjusting takes into account the efficiency behavior of pfc and of dcdc stage. Twostage optimization method for efficient power converter design including light load operation.
Ieee transactions on power electronics modeling method and. Efficiency optimization of integrated dcdc buck converters. The conventional buck converter is typically optimized for high efficiency at maximum load at the cost of lightload efficiency. A squirrel cage induction generator feeds the power to an improved topology of matrix converter which pumps power to a utility grid or can supply to an autonomous system. A twostage optimization method to optimize power converter efficiency from light load to full load is. Switching control method for light load efficiency.
Method description the proposed method of light load efficiency optimization is based on a simple observation that the minimization of. Singlephase pwm controller with light load efficiency optimization features flexible power supply from 5 v to 12 v bus power conversion input as low as 1. Particle swarm and fuzzy logic based optimal energy. The buck converter operates in the continuousconduction mode for heavy loading and the switching frequency is fixed at its maximum value. For a light load, hybrid method for efficiency optimization gives significant power loss reduction figures 5, 6, and 7.
A method of maintaining high powerconversion efficiency across the entire load range and its circuit implementations are described. Dec 04, 2014 efficiency and optimization seem to go hand in hand and they really do. For light loading, the buck converter operates in the discontinuousconduction mode and its. Lecture notes optimization methods sloan school of. Lightload efficiency optimization is based on a simple observation that. The clock frequency is programmed by the value of the resistor connected from the osc pin to ground. Simple hybrid model for efficiency optimization of. Light load thd and efficiency optimization of digitally controlled pfc converter with integrated valley switching control 4 pwm module configuration this section focuses on how to utilize the features in type 4 pwm to configure the pwm module to realize valley switching. As the load current increases, the rt8123a leaves the pulse skip mode and operates in the continuous conduction mode with fixedfrequency pwm. The optimization procedure first breaks the converter design variables into many switching frequency loops. The input voltage of the converter is 5 v, and the output voltage is 1. The power factor at the interface with the grid is controlled by the matrix converter. An improved power loss model of fullbridge converter under. Twostage optimization method for efficient power converter.
A method on maintaining high power conversion efficiency across the entire load range by substantially increasing the conversion efficiency at light loads by minimizing switching and driving. The performance of the proposed method was evaluated on a 500w, 400v12v dcdc converter and a 1kw acdc boost powerfactorcorrection frontend. Among many methods to improve light load efficiency, decreasing switching frequency. A twostage optimization method to optimize power converter\ud efficiency from light load to full load is proposed. Monolithic multimode dcdc converter with gate voltage. At light load condition, the ic automatically operates in the pulse skip mode to reduce switching frequency so as to improve conversion efficiency. Ieee transactions on power electronics 2017 modeling method and design optimization for a softswitched dcdc converter liang jia, member, ieee, srikanth lakshmikanthan, xin li, and yanfei liu, fellow, ieee.
Skip mode at light load for efficiency distributed power supply optimization general dcdc converter high precision 0. Optimization methods are somewhat generic in nature in that many methods work for wide variety of problems. An automatic loadadaptive switching frequency selection. High efficiency optimization of llc resonant converter for. Especially under the condition of light load, the motor efficiency can be obviously improved. In this paper, a new switching control method for light load efficiency improvement in psfb converter has been proposed. In this regard, a linear programming model is presented in order to optimize water use.
The implementation of innovative and efficient irrigation techniques is among the greatest challenges facing agriculture. Eer energy efficiency ratio eflh equivalent full load hours. Single phase pwm controller with light load efficiency. Besides, the proposed efficiency optimal control method can dramatically improve the system efficiency compared with the traditional diode rectifier especially under light load condition. Module 4 shipboard energy management module aims and learning objectives this module is intended to provide the awareness, knowledge, skills and motivation required of shipboard and officebased staff on shipboard energy management techniques and activities. In each fixed switching frequency loop, the optimal designs for 20%, 50%, and 100% load are derived separately in the first. The luminous efficiency of alingapbased leds can be increased by this method, since the light of devices cannot be absorbed by the gap substrate.
Studies of efficiency optimization methods based on optimal. Meeting energy efficiency requirements with voltage optimization. Method description the proposed method of light load efficiency optimization is based on a simple observation that the. The max77812 is a quadphase high efficiency stepdown buck converter capable of delivering up to 20a of maximum current. This paper presents a detailed study of the gate driving losses on a multimode stepdown buck dcdc converter. However, the bonding process of algainpgap needs a hightemperature treatment, which might result in the additional disadvantage of redistributing the doping profile. The power loss is mainly resulted from the switching loss and the conduction loss when the fullbridge converter works under light load condition. Max17530 42v, 25ma, ultrasmall, highefficiency, synchronous. In this thesis, novel oled structures including photonic crystal, fabryperot resonance cavity and hyperbolic metamaterials were numerically simulated and theoretically investigated. Lightload efficiency optimization method ieee xplore. Ac cycle skipping improves pfc lightload efficiency.
Consideration was also give to optimizing light and no load efficiency, which is particularly. A converter efficiency, optimiza tion method under lightload. The idea behind this model is to assess the effectiveness or ineffectiveness of precipitation to determine the amount of irrigation water required to optimize water use. And8460 implementing 12v240w power supply with ncp4303b. A simple switch concept is applied to set the desired magnetizing inductance, the main control factor, to achieve light load efficiency improving and overall required switching frequency range. Efficiency optimization methods in lowpower highfrequency. Lightload efficiency improvement by extending zvs range. Thus, a 10horsepower hp motor has an acceptable load range of 5 to 10 hp. The simulation results show that the hybrid search method has the advantages of fast optimization speed and good robustness. Pdf the efficiency of traditional inductive power transfeript systems with passive rectifiers is highly dependent on the load. The proposed method substantially increases the conversion efficiency at light loads by minimizing switching and driving losses of semiconductor switches, as well as core losses of magnetic components. The proposed method substantially increases the conversion efficiency at light loads by minimizing switching and driving losses of semiconductor. Light weight design is a fundamental requirement for protecting the environment and improving fuel economy. A motor s efficiency tends to decrease dramatically below about 50% load.
The switching frequency is programmable from 250 khz to 1 mhz. The various methods to improve the conversion efficiency of inverters are. Slusaa9a september 2011 revised november 2012 single. Linear optimization model for efficient use of irrigation. These gate driving losses are compared to the conduction resistive losses in order to find the optimum gate driving voltage that maximizes the converters efficiency. At power levels that the power converter is continuously on, this. Efficiency optimization of three phase induction motor by.
478 29 825 289 1331 1418 65 519 1588 969 216 319 1439 345 740 225 535 668 1234 764 675 459 1508 286 1026 263 1389 792 33 1145 557 1172 363 1150 429