Analysis of a GaN based PWM AC-AC converter with an improved switch loss model

Bulut, Enis Baris; Gülbahçe, Mehmet Onur; Kocabaş, Derya Ahmet

doi:10.1016/j.aeue.2020.153578

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…The output voltage has a constant rms value that is the same as the input voltage. The FFT plot of Figure 11c confirms the computed value of the output voltage's THD of Equation (28). Her line frequency harmonic (50 Hz) has significant magnitude, and it is a major cause of the high THD of the output voltage.…”

Section: Simulation Resultssupporting

confidence: 67%

“…The instantaneous values of the voltage and current may regard constant as their variation can be ignored at high switching frequencies. The value of switching losses for the existing circuits of [23,25,26] and the proposed topology in Equations ( 41)-( 44) respectively may be realized with the procedure as detailed in [28,29].…”

Section: Comparison With Similar Topologiesmentioning

confidence: 99%

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A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output

et al. 2022

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Variable voltage and frequency are required to govern the torque-speed characteristics of many industrial drive systems. Traditionally, this is achieved with a power converting system implemented with multistage converters. This technology is based on rectifying AC power into DC and then DC into AC with an inverter circuit. The power quality concerns of both conversion stages are tackled by selecting high switching frequency PWM control and harmonics mitigation filters. Also, using a bulky DC-link capacitor is one of the big sources of low system reliability, so this approach increases the conversion losses, circuit, and control complications. The frequency step-down conversion is very attractive with direct AC-AC converters as it has a simple control and circuit structure, but these converters face poor power quality challenges once the output frequency is decreased with respect to an input. In these converters, the total harmonic distortion (THD) of the output voltage becomes very poor once the output frequency is reduced. The problem of high THD of the output is addressed in the power converting circuits implemented with line frequency multi-winding transformers. The required number of output winding and switching devices (diodes and thyristors) increases once the value of the output frequency is decreased. This will increase the overall volume, cost, and losses. The use of a bulky and costly line frequency transformer may be eliminated if AC voltage controllers have non-inverted and inverted voltage buck capabilities, such existing topologies either have complex control schemes or require a large number of operating devices. Therefore, in this research article, a new transformerless frequency step-down converter employing fewer devices is proposed. This approach is realized with a high-frequency controlled rectifier for the required voltage stabilization and a low-frequency inverter bridge for frequency control. Its validation is supported by the results attained from Simulink and practical-based prototypes.

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Section: Simulation Resultssupporting

confidence: 67%

Section: Comparison With Similar Topologiesmentioning

confidence: 99%

A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output

et al. 2022

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“…Therefore, another local cost function, which is a product of power loss and heatsink volume, is used to select the optimal FET and heatsink pair. Calculating the conduction losses considering the temperature dependent on-state-resistance is straightforward [24]. On the other hand, switching loss calculation of a FET involves several components such as output charge losses (P Qoss ), reverse-recovery losses (P Qrr ), turn-off losses (P off ), body-diode or 3 rd quadrant losses during dead-time (P DT ), I-V overlap losses during turn-on (P IV ), and gate drive losses (P gate ).…”

Section: Selection Of Fetsmentioning

confidence: 99%

Optimization and Design Considerations of GaN-Based Multi-Level TP PFC Converters

Bulut

Kocabaş

Dusmez³

2023

IEEE Access

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Latest developments in low voltage wide-bandgap semiconductor technology have increased the popularity of single-phase multi-level (ML) totem pole (TP) power-factor correction (PFC) converters. Phase shifted flying capacitor based power stages offer several advantages, such as higher input current ripple frequency, smaller size inductor and differential mode (DM) filter, and usage of low voltage Gallium Nitride (GaN) devices with better figure-of-merit. Even though it has been proven that ML TP PFC converters have good power density and efficiency, the determination of optimal voltage levels and switching frequency requires a system-level optimization. This paper proposes an optimization framework for ML TP PFC converters, taking the power stage, thermal, DM filter, and magnetic designs, as well as practical design considerations, into account to determine the voltage-levels and switching frequency that minimize the power losses, cost and volume of the total system. To process output power of 3700W, the optimization tool suggests using a 4-Level GaN TP PFC topology switched at 45 kHz. The outcome of the tool has been compared with other fixed inductor current ripple designs, as well as optimized designs for 3-Level and 5-Level TP PFC converters in terms of cost, volume, and power losses. In accordance with the optimization results, a prototype of a 4L TP PFC rated at 3700 W is designed, which achieves a peak efficiency of 99.6% at 1 kW and >99.1% efficiency under the full power range.INDEX TERMS Ac/dc conversion, multi-level, optimization, power factor correction, totem-pole.

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Implementation and performance comparison of harmonic mitigation schemes for three-phase grid-connected voltage-source converter under grid voltage distortion: HiL and experimental validation

Srita

Somkun

2023

AEU - International Journal of Electronics and Communications

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Analysis of a GaN based PWM AC-AC converter with an improved switch loss model

Cited by 4 publications

References 18 publications

A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output

A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output

Optimization and Design Considerations of GaN-Based Multi-Level TP PFC Converters

Implementation and performance comparison of harmonic mitigation schemes for three-phase grid-connected voltage-source converter under grid voltage distortion: HiL and experimental validation

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