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This paper proposes a novel soft-switched auxiliary resonant circuit to provide a Zero-Voltage-Transition at turn-on for a conventional PWM boost converter in a PFC application. The proposed auxiliary circuit enables a main switch of the boost converter to turn on under a zero voltage switching condition and simultaneously achieves both soft-switch...
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Citations
... [30] To solve these cons, we imply soft-switching techniques, including Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) which is used to increase efficiency of the converter as well as reduce switching losses. [31][32][33][34][35][36] In this paper, we are doing an in-depth study on Buck and Boost converters, the circuitry, simulations, their states of charge and discharge, necessary inputs and the desired outputs in the form of graphs using Scilab-Xcos. ...
The need for electric vehicles is expanding vastly and so are the methods by which electric vehicle technology could help to reduce the carbon production and make the environment more pollution free. This research emphasizes on power electronic systems such as Buck and Boost converters used in electric vehicles through Scilab simulations. It draws attention to the mathematics associated with the elementary phases for the power electronic circuits. This paper describes the working, mathematics and simulation of buck and boost converters used in an electric vehicle. We analyze the different circuitry systems, build the block diagrams in Xcos, Scilab and illustrate the outputs in terms of graphical representations.
... The selection of line inductance L is linked mainly to ensure continuous line current to lower the stress and minimize the ripple ∆ i at the switching frequency. Considering the size and cost constraints, the line inductance value selected as follows (Kim et al., 2013): ...
... Values of the output DC-link capacitors C 01 and C 02 having similar values are determined considering the desired peak-peak ripple magnitude of the output DC voltage V 0 (Kim et al., 2013) as follows: ...
The requirement of high power rated, efficient and high power density grid connected converters has increased due to their extended use in multiple applications such as battery chargers. The proliferation of electric vehicles (EVs) in the transportation market is essentially associated with the performance and reliability of battery chargers. An efficient, compact and fast battery charger is indispensable in order to provide a way to charge an EV in a short time. In view of this fact, this article proposes a soft-switching three-level T-type vienna rectifier, which can be used as a front-end power stage converter in an on-board EV battery charger. The proposed topology achieves high efficiency and high power density by employing soft-switching strategy, which is achieved by incorporating a simple auxiliary network in the proposed circuit. The reduced component stresses and simple control strategy make it an appealing candidate for EV industries to develop this front-end PFC rectifier as a fast battery charger. The high switching operation with reduced power losses, regulated DC at the output, low-harmonic grid current and power factor correction operation are achieved with the proposed topology. The construction, operating principle and simulation analysis of the proposed converter are discussed in detail. In order to show the stand-point of the proposed scheme, a fair comparison of the proposed soft-switched converter with an existing soft-switched 3-level neutral-point diode-clamped converter is carried out in terms of the number of components and complexity in the PWM signals generation. Additionally, an efficiency comparison of the suggested converter is carried out with some existing well-known rectifier topologies at different power loads. The practical implementation of the proposed power converter scheme is checked by building a laboratory-prototype to perform an experimental analysis.
... The selection of line inductance L is linked mainly to ensure continuous line current to lower the stress and minimize the ripple ∆ i at the switching frequency. Considering the size and cost constraints, the line inductance value selected as follows (Kim et al., 2013): ...
... Values of the output DC-link capacitors C 01 and C 02 having similar values are determined considering the desired peak-peak ripple magnitude of the output DC voltage V 0 (Kim et al., 2013) as follows: ...
The requirement of high power rated, efficient and high power density grid connected converters has increased due to their extended use in multiple applications such as battery chargers. The proliferation of electric vehicles (EVs) in the transportation market is essentially associated with the performance and reliability of battery chargers. An efficient, compact and fast battery charger is indispensable in order to provide a way to charge an EV in a short time. In view of this fact, this article proposes a soft-switching three-level T-type vienna rectifier, which can be used as a front-end power stage converter in an on-board EV battery charger. The proposed topology achieves high efficiency and high power density by employing soft-switching strategy, which is achieved by incorporating a simple auxiliary network in the proposed circuit. The reduced component stresses and simple control strategy make it an appealing candidate for EV industries to develop this front-end PFC rectifier as a fast battery charger. The high switching operation with reduced power losses, regulated DC at the output, low-harmonic grid current and power factor correction operation are achieved with the proposed topology. The construction, operating principle and simulation analysis of the proposed converter are discussed in detail. In order to show the stand-point of the proposed scheme, a fair comparison of the proposed soft-switched converter with an existing soft-switched 3-level neutral-point diode-clamped converter is carried out in terms of the number of components and complexity in the PWM signals generation. Additionally, an efficiency comparison of the suggested converter is carried out with some existing well-known rectifier topologies at different power loads. The practical implementation of the proposed power converter scheme is checked by building a laboratory-prototype to perform an experimental analysis.
... A non-dissipative softswitching cell is proposed (21) for the IBC to achieve ZCT. The conventional ZVT network (10) is based on an auxiliary switch and a diode, however the network proposed in (23) uses only one auxiliary switch for successful ZVT. Therefore, the loss involved in the auxiliary diode is eliminated. ...
... Hence, the addition of the charge pump capacitor reduces the voltage stress on the switches S 1 and S 2 . The voltage stress of the main diodes D 1 and D 2 is given in Eq. (23). It indicates that the voltage rating of the main diode D 2 should be twice that of the main diode D 1 . ...
In this paper a modified zero-voltage zero-current transition network (MZVZCTN) is proposed for a charge-pump based dual boost converter. The proposed soft-switching network consists of two diodes, an auxiliary switch and a resonating inductor. To prevent the failure of zero-current transition of the main switches, auxiliary-capacitors are connected across the diodes of the soft-switching network. The high boost ratio is realized with charge-pump capacitor introduced on the load side. The MZVZCTN network is activated two times in a switching cycle in order to ensure zero-voltage turn-ON and zero-current turn-OFF of the main switching devices. Furthermore, the proposed network also ensures zero-current turn-OFF of the main diodes and does not impose any extra voltage stresses on the devices. The converter can operate at a constant frequency of operation with pulse width modulated control. A 460W prototype operating at a frequency of 50kHz is constructed, soft-transitions of the devices and improvement in efficency is validated through experiments.
... Thus, this leads to the reduction of the converter efficiency and poor power factor correction, especially at the higher voltage. However, the current harmonics profile meets the standards [20]. ...
... The value of the boost inductor has to be as large as possible so that it can operate the converter in the continuous current mode to obtain lower current stress and minimize the current ripple. To lower the cost and size of the converter, the optimized boost inductor L m was design in [20] as follows: ...
... The ripple is selected based on the difference between the input and output powers. The boost capacitor is selected using the given mathematical equation [20]: ...
In order to improve the power factor and reduce the input current harmonics, power factor correction (PFC) converters are utilized. This paper introduces a single-stage continuous conduction mode (CCM) soft-switched power factor correction (PFC) converter with a tandem topology. The proposed topology has two operating modes, namely resonant operation mode and boost operation mode. Such a design and control realizes the zero-voltage switching (ZVS) and zero current switching (ZCS) of the power switches. The proposed topology has been introduced to reduce the total harmonic distortion (THD) of the input current further in the boost PFC converter under lower power and higher output voltage conditions. The simulation and experimental results are presented to verify the effectiveness of the performance of the proposed design and its control.
... For high gain converter, soft switching technique is used to reduce EMI and switching loss [21] [22] [23] [24]. The active clamp methods are typically used for generating the zero voltage switching (ZVS) turn on of the main switch [25] [26] [27]. In [28], active clamp is used for zero current switching (ZCS) turn on and ZVS turn off. ...
... The magnitude of main inductor current can be solved by charge balance from (24). In (24), I Lrpk is substituted by the approximated value from (23), I L1n is the main inductor current at hard switching and can be related to the converter input current by (25). Equation (24) is based on the amount of extra charge processed by the resonant inductor. ...
... In [14,[16][17][18][19][20], the main devices operate with SS; in addition, the auxiliary switch turns on and off with SS. Thus, these converters overcome problems associated with HS for the auxiliary switch and decrease switching power losses. ...
In this study, a novel zero voltage transition pulse width modulation (ZVT-PWM) DC–DC boost converter with an active snubber cell is proposed. All of the semiconductor devices in the converter turn on and off with soft switching (SS). The main feature of the proposed converter is the absence of extra current or voltage stress on the main switch and main diode. There is also no extra voltage stress on the auxiliary switch and the auxiliary diodes. The main switch turns on with ZVT and turns off with zero voltage switching. The auxiliary switch turns on with zero current switching and turns off with zero current transition. The proposed converter smoothly operates under light-load conditions. Having a simple structure at low cost is the main advantage of the proposed converter. This study also realises the theoretical analysis of the proposed converter. The experimental results, the operating stages and the key waveforms of the proposed converter, are given in detail for 500 W and 100 kHz switching frequency. Moreover, it is shown that the overall efficiency reaches a value of 97.8% at nominal output power. The proposed SS topology can be used in applications with the battery power source and low-voltage DC-link.
... Generally, for PWM converters to decrease the switching losses, lossless snubber circuits are used to provide soft switching conditions. Providing soft switching conditions in high switching frequency converters has several merits, including reduction of switching losses and electromagnetic interference (EMI) which consequently can increase the converter power density [7][8]. In general, lossless snubber circuits are categorized as active and passive snubbers. ...
This paper introduces a family of single switch soft switching PWM converters where only one magnetic element is employed. The proposed converters within the family have the ability to provide soft switching conditions for all semiconductor elements. As a result, the problems related to the reverse recovery of diodes are excluded. The lossless passive snubber circuit in this family can be applied to a wide variety of switching power converters. Among the converters within the family, the theoretical analysis is provided for the buck converter, since the basic performance of the lossless snubber circuit is the same for the converters. To validate the theoretical analysis, a 120W prototype buck converter is implemented experimentally. The experimental results show that the proposed converter improves the converter's efficiency by over 2% compared to a conventional buck converter.
... If the problems related to increasing switching frequency such as switching losses and EMI are not solved, in some cases increasing switching frequency not only is not effective in reducing volume and weight of a converter, but it increases the volume too. Today, power converters are vastly used in various applications such as power factor correction (PFC) circuits [1]- [2], bidirectional converters as interface for battery charger and renewable energy sources [3] and also electric vehicles [4], photovoltaic cells [5]- [6], motor drivers [7], fuel cells [8]- [9] and LED drivers [10]. The interest is to provide soft switching conditions to increase the power conversion density and to improve the converter efficiency. ...
To increase the power conversion density, decrease switching losses and electromagnetic interference (EMI), and provide safe operating area for a switch, applying snubber circuits which provide soft-switching conditions is inevitable. Among different types of snubber circuits, passive snubbers, due to their simplicity and robustness, are preferred. These snubber circuits can obtain soft-switching conditions without any additional switch. Thus, gate drive and control circuits remain simple. In this paper, a simple lossless passive snubber circuit which can be applied on isolated and nonisolated converters is introduced. The proposed snubber circuit provides zero-current-switching and zero-voltage-switching conditions at turn-on and turnoff instants, respectively. The proposed snubber is applied on a boost converter and analyzed. Also, in order to prove the effectiveness of the proposed snubber circuit from the converter efficiency and EMI viewpoints, a 200-W prototype boost converter is implemented, and experimental results are presented. Also, the simulation results of a soft-switched flyback converter with the proposed snubber cell are presented.
