Naim Suleyman Ting

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

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.

A new Zero-Voltage-Transition PWM DC-DC boost converter

In this paper, a new ZVT-PWM DC-DC boost converter is proposed. In the proposed new converter, the main switch turns on under Zero Voltage Transition (ZVT) and turns off under Zero Voltage Switching (ZVS). Besides, the auxiliary switch turns on under Zero Current Switching (ZCS) and turns off under Zero Current Transition (ZCT). Also, the other semiconductor elements softly turn on and turn off under ZVS or ZCS. Another feature of proposed converter is that there is no additional current or voltage stress on the main switch and main diode. Also, there is no additional voltage stress on the auxiliary switch and the auxiliary diodes. The proposed new converter operates even under light load conditions and it has advantages as the simple structure, the low cost and easy control. Firstly, the theoretical analysis of the proposed converter is made. Then, the operating stages, the key waveforms and the simulation results of the new converter operated for 500 W and 40 kHz is given in detail.

A soft switching with reduced voltage stress ZVT-PWM full-bridge converter

This paper introduces a novel active snubber cell for soft switching pulse width modulation DC-DC converters. In the proposed converter, the main switch is turned on under zero voltage transition and turned off under zero voltage switching (ZVS). The auxiliary switch is turned on under zero current switching (ZCS) and turned off under zero current transition. The main diode is turned on under ZVS and turned off under ZCS. All of the other semiconductors in the converter are turned on and off with soft switching. There is no extra voltage stress on the semiconductor devices. Besides, the proposed converter has simple structure and ease of control due to common ground. The detailed theoretical analysis of the proposed converter is presented and also verified with both simulation and experimental study at 100 kHz switching frequency and 600 W output power. Furthermore, the efficiency of the proposed converter is 95.7% at nominal power.

A new soft switching three level T-type inverter

In this paper, a new soft switching T-type three level inverter is proposed. The proposed new converter provides for main switches to turn on with Zero Voltage Transition (ZVT) and turn off with Zero Voltage Switching (ZVS) without any voltage or current stresses. Also, the proposed new converter provides Soft Switching (SS) for all semiconductors. Besides, Electro Magnetic Interference (EMI) noises are decreased by soft switching cell. The proposed converter has a low cost, ease of control and simple structure. The theoretical analysis of converter is clarified and the operating stages are given in detail. The simulation results of converter are obtained for 3.3 kW and 50 kHz by PSIM program. It is observed that the simulation results and theoretical analysis of converter are perfectly suitable with each other.

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

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, PMSMs 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.

A soft switching power factor correction interleaved AC-DC boost converter

In this paper, a novel soft switching power factor correction (PFC) interleaved AC-DC boost converter is proposed. In the proposed novel converter, all of the semiconductor devices operate with soft switching. The main switches turn on with zero voltage transition (ZVT) and turn off with zero current transition (ZCT) without any extra voltage or current stresses. Auxiliary switch turns on with zero current switching (ZCS) and turns off with zero voltage switching (ZVS). Besides, the main diodes turn on with zero voltage switching (ZVS) and turns off with ZCS without any extra voltage or current stresses. Owing to interleaved structure, the ripple of the input current and output voltage is reduced. So, power factor quality is significantly good. The output current and voltage are controlled in wide line and load range. The theoretical analysis of converter is clarified and the operating modes are given in detail. The simulation results of converter are obtained for 1.5 kW and 100 kHz. It is observed that the semiconductor devices operate with soft switching (SS) perfectly. Also, the novel proposed converter has 0.99 power factor with sinusoidal current shape.

A new ZCT-ZVT PWM interleaved DC-DC boost converter

In this paper, a new ZCT-ZVT PWM interleaved DC-DC boost converter with an active snubber cell is proposed. By considering interleaved approach, this topology minimizes the ripple of the output voltage and input current. Also, it provides to be reduced the extra current stress on the main devices. In proposed new converter, all of the semiconductor components softly turn on and turn off with Zero Voltage Switching (ZVS) or Zero Current Switching (ZCS). The main feature of proposed converter is that the extra current and voltage stresses do not occur on the main switches and main diodes. Also, the current stress on the auxiliary switch is at acceptable level. In the proposed converter, the main switch perfectly turns on with Zero Voltage Transition (ZVT) and turns off with Zero Current Transition (ZCT). Therewith, the auxiliary switch turns on with ZCS and turns off with ZVS. Additionally, the proposed converter smoothly operates under light load conditions and wide input line voltage. Another advantage of this converter is that the soft switching is achieved by just one auxiliary switch. The theoretical analysis of the proposed converter is made. The operating stages, the waveforms and the simulation results of the proposed converter operated for 1.5 kW and 100 kHz is given in detail.