This paper proposes a novel bidirectional single-phase single-stage ac–dc converter for Electric Vehicle (EV) charging application. AC side of the proposed converter has current-fed half-bridge converter that is connected to the full-bridge converter on secondary side of a high-frequency transformer. Current at the input of the ac side can be regulated to realize power factor correction. The proposed converter achieves Zero Current Switching of primary side switches and zero current turn-ON for secondary side devices throughout the operation without any additional components. This paper also presents novel modulation technique and control algorithm to ensure soft switching throughout the operation range of the converter in both directions of power flow. Design equations are derived to help suitable selection of components for a given specification. Design of the converter, control strategy, and the results are presented for a 1.5-kVA converter for EV charger.

Novel Bidirectional Single-phase Single-Stage Isolated AC–DC Converter With PFC for Charging of Electric Vehicles

This paper proposes an integrated Cuk-SEPIC converter for standalone hybrid wind and photo voltaic (PV) system. The proposed converter is developed by sharing the converter components between Cuk and SEPIC converters and it operates in both individual and simultaneous modes, based on the availability of source and eliminates the need of input filter to suppress the high frequency harmonics. Therefore, it has the advantage of simple structure and reduced converter components.Â  The proposed converter is designed and then analyzed for the hybrid wind and PV system. This study considers a 1.8 KW wind system and a 2 KW PV system with maximum power point tracking (MPPT) algorithms of incremental conductance plus integral control and perturbs & observes methods for wind and PV system respectively. The effectiveness of the proposed converter is validated using the simulation results and usage of the converter based on availability of the renewable energy sources is presented.

https://www.ijrer-net.ijrer.org/index.php/ijrer/article/download/5078/pdf

Design and Analysis of an Integrated Cuk-SEPIC Converter with MPPT for Standalone Wind/PV Hybrid System

In this paper, a new class of dc–dc converter topologies based on capacitive link dc–dc converters—Cuk, SEPIC, and Zeta converters—that operate under the critical conduction mode has been proposed. The proposed converters are the extensions of quasi-square-wave zero-current-switching converters, which use an auxiliary circuit to provide zero-current and zero-voltage switching for all semiconductor switches at both turn on and turn off transitions and eliminate voltage ringing across the output switch. Using the proposed auxiliary circuit, the value of dv / dt has been diminished; hence, the EMI of the proposed topology is significantly reduced compared to the conventional quasi-square-wave zero-current-switching converters. To verify the operation of the proposed converter and confirm its advantages, an experimental prototype has been implemented, and the experimental results and the efficiency of the proposed converter have been compared with the conventional quasi-square-wave zero-current-switching converters.

A Family of Ćuk, Zeta, and SEPIC Based Soft-Switching DC–DC Converters

In this paper, the comparative performance analysis of Field oriented control (FOC) of Permanent magnet brushless DC (PMBLDC) motor using sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) techniques is presented. The primary focus of using field oriented control for motor is to control the motor parameters in d-q axes along with sinusoidal and space vector modulated pulses for voltage source inverter driving the BLDC motor. This vector control method improves the system performance along with high efficiency and low torque ripple thus making it suitable for finding applications in high performance variable frequency drives. The sensor less approach for rotor position sense provides an advantage of cost reduction with ease of implementation using digital signal controllers (DSCs) and microprocessors. The analysis of the system is realized using MATLAB/SIMULINK program. The simulation results show that the SVPWM based system has superior performance compared to SPWM system.

Comparative analysis of field oriented control of BLDC motor using SPWM and SVPWM techniques

In this paper, a new zero-voltage transition (ZVT) snubber cell is developed for pulse width modulated (PWM) and power factor corrected (PFC) boost converters operating in continuous conduction mode. A new family of PFC boost converter implemented with this new ZVT snubber cell is proposed. In this new PFC boost converter, the main switch is turned-on perfectly with ZVT and turned-off under zero-voltage switching (ZVS). Besides, the auxiliary switch is turned-on under zero current switching and turned-off under ZVS. The main and all auxiliary diodes are operating under soft switching. During ZVT operation, the switching energies on the snubber inductance are transferred to the output by a transformer, and so the current stresses of the inductance and the auxiliary switch are significantly decreased. Also, this transformer ensures the usage of sufficient capacitors for ZVS turning off of the main and auxiliary switches. The main switch and main diode are not subjected to any additional voltage and current stresses. In this study, a detailed steady-state analysis of the proposed new ZVT-PWM-PFC boost converter is presented and this theoretical analysis is verified by a prototype with 100 kHz and 2 kW.

A New ZVT Snubber Cell for PWM-PFC Boost Converter', IEEE Transactions on Industrial Electronics

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.

https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-pel.2015.1052

ZVT-PWM DC–DC boost converter with active snubber cell

In this paper, a novel soft switching passive snubber cell for family of isolated/non-isolated pulse width modulation DC–DC converter is proposed. In this proposed converter, the switch is turned on with zero current switching (ZCS) and is turned off with zero voltage switching (ZVS). Besides, the main diode is turned on and off with ZVS and ZCS, respectively. In addition, the reverse recovery losses of main diode are minimized. The auxiliary diodes in the snubber cell are operated with soft switching. The proposed converter has a simple structure, low cost and ease of application. The detailed theoretical analysis of new converter is made, and a 200-W laboratory prototype is implemented. The theoretical analysis is confirmed with the experimental results. Finally, the proposed passive snubber cell is applied to family of other isolated/non-isolated DC–DC converter in order to provide soft switching.

Soft switching passive snubber cell for family of PWM DC–DC converters

This study proposes a novel zero voltage transition (ZVT) pulse width modulation (PWM) DC–DC interleaved boost converter with an active snubber cell. All the semiconductor devices in the converter turn on and off with soft switching to reduce the switching power losses and improve the overall efficiency. Through the interleaved approach, the current stresses of the main devices and the ripple of the output voltage and input current are reduced. The main switches turn on with ZVT and turn off with zero voltage switching (ZVS). The auxiliary switch turns on with zero current switching (ZCS) and turns off with ZVS. In addition, the snubber cell does not create additional current or voltage stress on the main switches and main diodes. The proposed converter can smoothly achieve soft switching characteristics even under light load conditions. The theoretical analysis and operating stages of the proposed converter are made for the D > 50% and D < 50% modes. Finally, a prototype of the proposed converter is implemented, and the experimental results are given in detail for 500 W and 50 kHz. The overall efficiency of the proposed converter reached 95.5% at nominal output power.

/pdf/analysis-design-and-implementation-of-a-zero-voltage-1wd699sc35.pdf

Analysis, Design, and Implementation of a Zero-Voltage-Transition Interleaved Boost Converter

In this paper, a high-efficiency ZVT–ZCT PWM boost converter with direct power transfer is proposed. In the proposed converter, the main switch turns on with zero voltage transition and turns off with zero current transition. The main diode turns on with zero voltage switching and turns off with zero current switching. All of the other semiconductors in the converter turn on and off with soft switching. There is no extra current or voltage stress on the main semiconductors. The most important feature of the proposed converter is that it has direct power transfer. So, the efficiency of converter can be increased. Also, it has features as low cost, simple structure and easy control. In this study, detailed theoretical analysis of the proposed converter is made by operation intervals. A prototype with 500 W output power and 100 kHz switching frequency is realized in laboratory. It is shown that the experimental results are compatible with theoretical analysis. The efficiency of the proposed converter is 98.9% at nominal power.

A highly efficient ZVT–ZCT PWM boost converter with direct power transfer

In this paper, the performance of space vector pulse width modulation (SVPWM), sinusoidal pulse width modulation (SPWM) and hysteresis current control (HCC) control techniques used in power control with back to back converter of permanent magnet synchronous generator used in wind turbines are comparatively analyzed in terms of dynamic response, total harmonic distortion (THD), torque ripple and current ripple. Furthermore, SVPWM and SPWM are compared in terms of the using DC link voltage. Analysis of system is realized with MATLAB/Simulink program. There is not paper that together of these three control techniques are compared in terms of common results or values in literature. Permanent magnet synchronous generator (PMSG) is used in simulations is surface mounted, bipolar and its power is 1.8 kW. However, PMSM's energy transmission to grid is made with Field Oriented Control (FOC). According to analysis results, it has been observed that SVPWM generally has more efficient results than both HCC and SPWM control technique. Also, it is observed that SVPWM can produce about 15 percent higher than SPWM in output voltage.

Naim Suleyman Ting

Papers

ZVT-PWM DC–DC boost converter with active snubber cell

Soft switching passive snubber cell for family of PWM DC–DC converters

Analysis, Design, and Implementation of a Zero-Voltage-Transition Interleaved Boost Converter

A highly efficient ZVT–ZCT PWM boost converter with direct power transfer

Comparison of SVPWM, SPWM and HCC control techniques in power control of PMSG used in wind turbine systems