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Comparison among Chargers of Electric Vehicle Based on Different Control Strategies

Comparison among Chargers of Electric Vehicle Based on Different Control Strategies

The consequence of simulation shows that the two control strategies achieve power factor correction and harmonic reduction requirements; Boost type power conversion circuit employs the a[r]

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Development of an AC DC boost power factor correction

Development of an AC DC boost power factor correction

In a purely resistive AC circuit, voltage and current waveforms are in step (or in phase), changing polarity at the same instant in each cycle. Where reactive loads are present, such as with capacitors or inductors, energy storage in the loads result in a time difference between the current and voltage waveforms. This stored energy returns to the source and is not available to do work at the load. A circuit with a low power factor will have thus higher currents to transfer at a given quantity of power than a circuit with a high power factor.
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POWER FACTOR CORRECTION CONTROLLER FOR PMBLDC MOTOR USING DUAL BOOST CONVERTER

POWER FACTOR CORRECTION CONTROLLER FOR PMBLDC MOTOR USING DUAL BOOST CONVERTER

Schematic diagram of a three level voltage source inverter fed PMBLDC motor with PFC full bridge converter is shown in Fig.1.This is a closed loop control circuit using 3 Hall Sensors. MOSFETs are used as switching devices here. For very slow, medium, fast and accurate speed response, quick recovery of the set speed is important keeping insensitiveness to the parameter variations. In order to achieve high performance, many conventional control schemes are employed. At present the conventional PI controller handles these control issues. Moreover conventional PI controller is very sensitive to step change of command speed, parameter variation and load disturbances.
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A Bridgeless Interleaved Continuous Conduction Mode Boost Power Factor Correction Converter

A Bridgeless Interleaved Continuous Conduction Mode Boost Power Factor Correction Converter

The Interleaved Boost PFC rectifier with high gain output voltage has been proposed and experimentally verified. The experimental results have shown good agreements with the predicted waveforms analyzed in the paper. The power factor of the circuit has at all the specified input and output conditions. Satisfaction of the requirements can be easily achieved by the proposed circuit. Moreover, with higher efficiency and high power factor the proposed topology is able to be applied to most of the consumer electronic products of 150W rating in the market. Also, with only a single switch employed, the implemented system control circuit is simple to achieve high power factor by applying any PWM control.
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Dual Mode Controller Based Boost Converter Employing Soft Switching Techniques

Dual Mode Controller Based Boost Converter Employing Soft Switching Techniques

This paper presents a single phase power factor correction converter implementing an active snubber circuit and a dual mode controller. This new PFC is realized with a 200V ac input to provide a 400V dc output. This PFC consists of a main switch that is turned ON by ZVT and turned OFF by ZCT and an auxiliary switch that has ZCS turn ON and turn OFF. The active snubbercircuit provide soft switching to the main and auxiliary switches, thus eliminating the voltage and current stresses on the main switch. The voltage stresses on the auxiliary switch is also eliminated, but the current stresses exists which can be reduced by transferring these stresses to the output load by coupling inductance. The dual mode control method combines both CCM and CRM and it provides high power and efficiency at light-load conditions. The dual-mode controller of the boost PFC is particularly suitable for a fixed frequency boost PFC controller the dual mode control circuit is simple and easy to implement in the IC without much additional space and cost. The overall efficiency and optimum power factor is obtained at both light-load and heavy-load conditions.
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Power Factor Correction Using New Dc-Dc Converter Fed Dc Motor Drive

Power Factor Correction Using New Dc-Dc Converter Fed Dc Motor Drive

ABSTRACT: Thestrategyusually used in manufacturing, commercial and residential applications need to go throughadaptationdesigned for their suitableimplementation and operation. They are coupled to the grid comprising of non-linear loads and thus have non-linear input characteristics, which results in production of non-sinusoidal line current. Also, current comprising of frequency components at multiples of line frequency is observed which direct to line harmonics. Due to the increasing insist of these strategies, the line current harmonics create a keydifficulty by degrading the power factor of the system thus disturbing the performance of the strategy. Hence there is a require to reduce the line current harmonics so as to get better the power factor of the system. This has lead to designing of Power Factor Correction circuits.Power Factor Correction (PFC) involves two techniques, Active PFC and Passive PFC. In our systemexertion we contain designed an active power factor circuit using Buck Converter for improving the power factor. Average Current Mode Control method has been implemented with buck converter to check the effect of the active power factor corrector on the power factor. The assistance of using Buck Converter in power factor correction circuits is that enhanced line regulation is obtained with substantial power factor. The proposed concept can be implemented to DC motor drive Applications for two switch buck boost converter by using mat lab/Simulink software.
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Current Controlled Single-Phase Interleaved Boost Converter with Power Factor Correction

Current Controlled Single-Phase Interleaved Boost Converter with Power Factor Correction

ABSTRACT: Design and implementation of boost and Interleave Boost Converter ((IBC) with Proportional and Integral (PI) average current control method for Power Factor Correction (PFC) is presented. The Power Factor (PF) is increased significantly with reduction in total harmonic distortion (THD), current ripple and voltage ripple by integrating the IB converter into the full bridge diode rectifier. The proposed PI average current control method is based on sensing of the input current which can easily be accomplished by using unidirectional current transformer. The full bridge Boost and IB converter with pulse width modulation based on multiplier circuit is analysed as it enhances the voltage gain with reduction in voltage stress of semiconductors in the boost and IBC rectifier circuit. Hence High efficiency is achieved with low voltage rated MOSFETs and diodes. Control characteristics and performance of the IB converter is analysed using state space model and verified by a measurement result from a 1500W model. Operation of the converter with variable switching frequency (25 KHz -100 KHz) and variable load (50 Ω -200Ω) is reported.
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Single-Inductor Dual-Output Buck-Boost Power Factor Correction Converter

Single-Inductor Dual-Output Buck-Boost Power Factor Correction Converter

According to Fig.2, low pass filter, Re1 and Ce1, Re2 and Ce2 are used to filter inductor freewheeling current sense signal on Rs1 and Rs2. Due to low frequency (2fL) ripple on Rs1 and Rs2, the time constant of these low pass filters should be lower than 1/2fL. The capacitance and resistance of these two filters are designed as 100nF and 120k_ in this prototype. Two compensators (Op1, Re3, Ce3, Op2, Re4 and Ce4) are applied to achieve sufficient phase margin and low bandwidth for power factor correction. Fig.10 shows the loop gain of Psim simulation results at 100Vac for sub-converter A with different compensation parameters (_1, _2 and _3) by using the circuit parameters shown in Table I. It can be observed that when time constant _ =Re3Ce3 is lower than 0.22ms, the phase margin is approximately 90 degree when the compensator is applied. The bandwidth will be lower than 20Hz, which can ensure acceptable power factor correction requirement, but
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Development of a power factor correction boost converter in single phase rectifier using fuzzy logic

Development of a power factor correction boost converter in single phase rectifier using fuzzy logic

An analysis of boost converter circuit revealed that the inductor current plays significant task in dynamic response of boost converter. Additionally, it can provide the storage energy information in the converter. Thus, any changes of inductor may effect output voltage and output voltage will provide steady state condition information of converter. However, the three main parameter need to be considered when designing boost converters are power switch, inductor and capacitor. In this objective to achieve the desired output voltage[9].
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Comparative Study of Power Factor Correction and THD Minimization Using Boost Converter and Interleaved Boost Converter Using Pi Controller

Comparative Study of Power Factor Correction and THD Minimization Using Boost Converter and Interleaved Boost Converter Using Pi Controller

Power factor is a figure of merit that measures how effectively power is transmitted between a source and load network. It always has a value between zero and one. The unity power factor condition occurs when the voltage and current waveforms have the same shape, and are in phase. Power factor is defined as the cosine of the angle between voltage and current in an ac circuit. If the circuit is inductive, the current lags behind the voltage and power factor is referred to as lagging. However, in a capacitive circuit, current leads the voltage and the power factor is said to be leading. Power factor can also be defined as the ratio of active power to the apparent power .The active power is the power which is actually dissipated in the circuit resistance. The reactive power is developed in the inductive reactance of the circuit. Power factor = (Active power)/ (Apparent power) A load with a low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. The higher currents increase the energy lost. So power factor improvement is required
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Design and Simulation of PFC Based DC-DC Buck – Boost Converter Fed DC Motor System

Design and Simulation of PFC Based DC-DC Buck – Boost Converter Fed DC Motor System

ABSTRACT:The devices generally used in industrial, commercial and residential applications need to undergo rectification for their proper functioning and operation. They are connected to the grid comprising of non-linear loads and thus have non-linear input characteristics, which results in production of non-sinusoidal line current. Also, current comprising of frequency components at multiples of line frequency is observed which lead to line harmonics. Due to the increasing demand of these devices, the line current harmonics pose a major problem by degrading the power factor of the system thus affecting the performance of the devices. Hence there is a need to reduce the line current harmonics so as to improve the power factor of the system. This has led to designing of Power Factor Correction circuits.Power Factor Correction (PFC) involves two techniques, Active PFC and Passive PFC. In our project work we have designed an active power factor circuit using Buck Converter for improving the power factor. Average Current Mode Control method has been implemented with buck converter to observe the effect of the active power factor corrector on the power factor. The advantage of using Buck Converter in power factor correction circuits is that better line regulation is obtained with appreciable power factor. The proposed concept can be implemented to DC motor drive Applications for two switch buck boost converter by using mat lab/Simulink software.
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An Active Power Factor Correction Technique for Bridgeless Boost AC DC Converter

An Active Power Factor Correction Technique for Bridgeless Boost AC DC Converter

For a purely resistive circuit, the PF is 1 since the reactive power equals zero. For a purely inductive circuit, the PF is zero since true power equals zero. Same for a purely capacitive circuit. Thus, if there are no dissipative (resistive) components in the circuit, the true power must be zero, making any power in the circuit purely reactive. PF is an important aspect to consider in an AC circuit; because any power factor less than 1 means that the circuit’s wiring has to carry more current than what would be necessary to deliver the same amount of (true) power to the resistive load. Thus, the poor power factor indicates an inefficient power delivery system. Poor PF can be corrected by adding another load to the circuit drawing an equal but opposite amount of reactive power, to cancel out the effects of the load’s inductive reactance. Inductive reactance can only be canceled by capacitive reactance, so we have to add a capacitor in parallel to the circuit as additional load. The effect of these two opposing reactance in parallel is to bring the circuit’s total impedance equal to its total resistance (to make the impedance phase angle equal, or at least closer, to zero).
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Analysis of  Power Factor Correction Technique Using PFC Boost Converter

Analysis of Power Factor Correction Technique Using PFC Boost Converter

A. Dual boost converters: Boost converters are used as active power factor correctors. However, a recently PFC is to use dual boost converter (Fig.2) i.e. two boost converters connected in parallel. Where choke Lb1 and switch Tb1 are for main PFC while Lb2 and Tb2 are for active filtering, the filtering circuit serves two purposes i.e improves quality of line currents and reduces the PFC total switching loss. The reduction in switching losses occurs due to different values of switching frequency and current amplitude for the two switches.
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DEVELOPMENT OF BUCK-BOOST CONVERTER TO ACHIEVE HIGH PF USING SERIES RESONANT CIRCUIT - PART I

DEVELOPMENT OF BUCK-BOOST CONVERTER TO ACHIEVE HIGH PF USING SERIES RESONANT CIRCUIT - PART I

The objective of this project work is to develop a Buck-Boost Converter to achieve high power factor with high operating frequency with simulation study. The recent technologies which involve high frequency applications such as wireless power transfer (WPT) use a high operating frequency in the range from a few hundred of kHz to over some of MHz. Such buck, boost or buck-boost configuration adopt improved power quality in terms of reduced total harmonic distortion (THD) of input current, power-factor correction (PFC) at AC mains and precisely regulated and isolated DC output voltage feeding to loads from few Watts to several kW. Further this paper presents a comprehensive study on power factor corrected single-phase AC-DC converter configuration, control strategy and design considerations, power quality considerations, latest trends, potential applications and future developments. Simulation results as well as comparative performance are presented and discussed for such proposed topology.
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A Low-Loss Operation of Boost-Based Power Factor Correction Circuit by using Auxiliary ZVT Circuit

A Low-Loss Operation of Boost-Based Power Factor Correction Circuit by using Auxiliary ZVT Circuit

However, as switching frequency increases, the output diode operating at dc-link voltage produces significant reverse-recovery losses that appear as additional turn-on losses along with the increased switching loss in the circuit [3]. The auxiliary ZVT concept was first presented in [4], where a switch, a diode, and an inductor are implemented to achieve the lossless switching transition. A review of unidirectional as well as bidirectional single-phase PFC rectifier topologies with improved power quality is presented in [5], where the most popular and widely used topology is a boost-type PFC which consists of a diode bridge followed by boost circuit. To achieve high power density and faster transient response, the boost PFC is pushed to operate at high switching frequencies. A family of self-commutated auxiliary circuits is used to minimize these problems. These converters achieve zero current switching (ZCS) in the additional switch but experience higher voltage stresses in their passive components. A family of bridgeless PFC circuit having coupled inductors to ensure ZCT in the auxiliary switch was proposed in [6]. Also, a bridgeless PFC without additional voltage and current stresses in the auxiliary device was proposed in [7]. The main drawback of this converter is that the auxiliary switch is turned OFF while it is conducting current. Due to hard-switching losses, we don’t get the benefits gained with the auxiliary circuit. Converters in [8] and [9] use a dissipative snubber circuit to limit these losses but the auxiliary switch still operates in a hard-switched condition. The auxiliary inductor and the auxiliary diode are in series with the boost diodes thereby carrying the full-load current and adding to the conduction losses.
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Power Factor Correction of Three Phase Rectifier with Interleaved Boost Converter

Power Factor Correction of Three Phase Rectifier with Interleaved Boost Converter

A two-limb parallel connected conventional boost converter is shown in Fig.4 this is typically called an interleaved boost converter. This converter is used to improve power factor For a step-up application, an equivalent interleaved boost converter offers several advantages over a conventional boost converter; such as a lower current ripple on the input and output stages. Therefore, there is there is the opportunity to minimise the output capacitor filter that is often quite large in the conventional boost . In addition, it effectively increases the switching frequency without increasing the switches losses. Furthermore, it provides a fast transient response to load changes and improves power handling capabilities. A higher efficiency may be realized by splitting the input current into two paths, substantially reducing i 2 R losses and inductor AC losses. This also gives low stresses on components due to the current split which increases the power processing capability [9]. However, using an interleaved converter increases the number of power handling components and circuit complexity which may lead to an increase in cost. However, in renewable energy systems, long-term improved power generation can help to offset this disadvantage [9]. The topology of the interleaved boost converter consists of two limbs operating at 180 degrees out of phase from each other. Typically, each branch operates in the same fashion as a conventional boost converter previously described in Chapter four. When S1 turns on, the current ramps up in L1 with a slope depending on the input voltage storing energy in L1, D1 is off during this time since the output voltage is greater than the input voltage. When S2 turns off, the L2 inductor delivers part of its stored energy to output capacitor and the load, the current in L2 ramps down with a slope dependent on the difference between the input and output voltage. One half of a switching period later, S2 also turns on, completing the same cycle of events
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An Efficient AC/DC Converter with Power Factor Correction

An Efficient AC/DC Converter with Power Factor Correction

Thus, in each half line cycle, one of the MOSFET operates as an active switch and the other one operates as a diode. The difference between the bridgeless PFC and conventional PFC is that in bridgeless PFC converter the inductor current flows through only two semiconductor devices, but in conventional PFC circuit the inductor current flows through three semiconductor devices. The two slow diodes of the conventional PFC converter are replaced by one MOSFET body diode in bridgeless PFC converter. Since both the circuits operates as a boost DC/DC converter; the switching loss of the converters are same. Thus, the efficiency improvement in bridgeless PFC converter relies on the conduction loss difference between the two slow diodes and the body diode of the MOSFET. The bridgeless PFC converter also reduces the total components count as compared to a conventional PFC converter.
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Soft Switching Operation Of Boost-Based Power Factor Correction Circuit By Using Auxiliary ZVT Circuit

Soft Switching Operation Of Boost-Based Power Factor Correction Circuit By Using Auxiliary ZVT Circuit

circuit. Converters in [6] and [7] use a dissipative snubber circuit to limit these losses but the auxiliary switch still operates in a hard-switched condition. A family of self-commutated auxiliary circuits is used to minimize these problems. These converters achieve zero current switching (ZCS) in the additional switch but experience higher voltage stresses in their passive components. A family of bridgeless PFC circuit having coupled inductors to ensure ZCT in the auxiliary switch was proposed in [8]. Also, a bridgeless PFC without additional voltage and current stresses in the auxiliary device was proposed in [9]. The auxiliary inductor and the auxiliary diode are in series with the boost diodes thereby carrying the full-load current and adding to the conduction losses.
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Analysis of Correction of Power Factor by Sin...

Analysis of Correction of Power Factor by Sin...

Energy conservation is the world's most urgent work at present. This study focuses on the research and development of the AC-DC conversion circuit for variable frequency control, which is closely related to human life. It uses the bridgeless rectifier circuit, coupled with the Interleaved Boost and “PFC” (Power Factor Correction) technology to design a high-efficiency AC/DC conversion circuit. In electrical engineering, the power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit, and is a dimensionless number in the closed interval of −1 to 1.In power system power factor (p.f) is an important factor of continuous quality electrical supply some time it reduces due to some reactive power disorder power factor affected and by hence the quality (voltage and efficiency) also affected. There are many methods to improve the power factor such as capacitor bank, synchronous condenser, thyristor controlled rectifier(TCR) etc. But they have losses problem so a new technique is introduced three level single inductor bridge less boost power factor correction rectifier with voltage clamp property by the MATLAB simulation technique it used bridge less three level boost topology. It consist of two different types of diode, i.e fast diode & slow diode , MOSFET, capacitor & inductor due to use of semiconductor device soft switching it has high efficiency, low device voltage stress as well as high Voltage gain. With the help of MATLAB simulation four modes of operation is processed these are (a).Charging stage in the positive half cycle and (b).discharging stage in positive half cycle (c).Charging stage in the negative half cycle and (d). Discharging stage in negative half cycle and the whole improved power factor supply is obtained in the wave form. And this output is to give the feasible input to the other electrical device such as electrical motor. It can be used in UPS for regular power supply.
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Soft Switched Boost Converter for Active Power Factor Correction

Soft Switched Boost Converter for Active Power Factor Correction

the semiconductor device results in reverse recovery losses and electromagnetic interference problems. In recent years, many soft-switching techniques have come forth to reduce the adverse effects of conventional boost power factor correction converters. Soft-switching techniques, especially zero-voltage-transition have become more and more popular in the power supply industries. These converters have an auxiliary circuit connected in parallel to the main switch to help it turn on with zero-voltage-switching. ZVT converters operate at a fixed frequency while achieving zero voltage turn-on of the main switch and zero current turn-off of the boost diode. This is accomplished by employing resonant operation only during switch transitions. During the rest of the cycle, the ZVT network is removed from the circuit and converter operation is identical to conventional boost converter [3].
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