Soft-Switching Bidirectional Buck/Boost Converter With a Lossless Passive Snubber

Mohammadi, Mohammad Reza; Farzanehfard, Hosein; Adib, Ehsan

doi:10.1109/tie.2019.2947850

Cited by 15 publications

(14 citation statements)

References 34 publications

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“…It is possible to overcome part of the aforementioned limitations with the use of nondissipative snubbers composed of only diodes, inductors, and capacitors. Even though some recent competitive topologies have been reported lately, 9,10 the capacity to achieve soft switching over a wide load range is limited because zero-current transition (ZCT) and zero-voltage transition (ZVT) techniques cannot be implemented without auxiliary switches. Besides, it is still necessary to use complex design expressions and component count is of major concern similarly to the case of active snubber circuits.…”

Section: Introductionmentioning

confidence: 99%

In‐depth analysis of an RCD snubber applied to a DC‐DC boost converter

Vaz

Tofoli

2020

Circuit Theory & Apps

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Resistor-capacitor-diode (RCD) snubbers are traditionally used in practice aiming to maintain the stresses on semiconductors within safe operating limits. However, a serious drawback is the power lost in the resistor, which may affect the converter efficiency significantly. In this context, this work proposes a detailed procedure for the accurate design of an RCD snubber based on two additional key parameters that are not considered in typical guidelines provided in didactic books, that is, the forward recovery time of the main diode and the inductor current ripple. The impact of the maximum additional voltage spike on the switch is first assessed considering that it influences both the power dissipated in the snubber resistor and the current stresses on all semiconductors. A systematic optimization of the design is presented later on, considering that proper tradeoffs can be made among the type of main diode used in the converter, the maximum voltage spike on the switch, and the inductor current ripple as demonstrated mathematically. A dc-dc boost converter operating in continuous conduction mode (CCM) is thoroughly analyzed so that is possible to derive a consistent methodology comprising all power stage elements. This study intends to shed new light on an old research topic, as well to investigate the snubber impact on the converter operation and overall performance. The effectiveness of the proposed approach is demonstrated experimentally employing a laboratory prototype rated at 200 W. The results clearly show that is possible to optimize the design as desired, with good overall performance over a wide load range considering all aforementioned aspects.

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Section: Introductionmentioning

confidence: 99%

In‐depth analysis of an RCD snubber applied to a DC‐DC boost converter

Vaz

Tofoli

2020

Circuit Theory & Apps

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“…Moreover, WBG devices are quite expensive. Thus, various softswitching techniques for implementing high-frequency driving for a BBC using a general Si-FET have been actively investigated [9]- [35]. Typically, the soft-switching methods for a BBCs can be divided into two categories depending on whether or not an auxiliary switch is used.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, to overcome the above-mentioned disadvantages of the active snubbers, studies on the so-called passive snubbers have been presented in [32]- [35]; these methods fall in the second category. Although the methods described in [32]- [35] are capable of achieving soft switching and do not suffer from the reverse recovery problem, they still exhibit the following drawbacks. In [32] and [33], the root mean square current of the main switch is always large regardless of the load.…”

Section: Introductionmentioning

confidence: 99%

“…A narrow range of soft switching by the duty cycle is described in [33]. Also, the method described in [35] requires complex frequency control to reduce the circulating current from the auxiliary inductor-capacitor resonant circuit, especially for light load conditions. However, although the method described in [35] can overcome the problems mentioned in [33]- [34], it requires an additional auxiliary inductor and a main coupled inductor instead of a single inductor for soft switching.…”

Section: Introductionmentioning

confidence: 99%

“…Also, the method described in [35] requires complex frequency control to reduce the circulating current from the auxiliary inductor-capacitor resonant circuit, especially for light load conditions. However, although the method described in [35] can overcome the problems mentioned in [33]- [34], it requires an additional auxiliary inductor and a main coupled inductor instead of a single inductor for soft switching. Furthermore, the secondary-side leakage inductance of the coupled inductor also affects the soft-switching condition; therefore, an appropriate leakage inductance must be designed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lossless Snubber Cell for a Soft-Switched Bidirectional Buck–Boost Converter

Joo

Han

2020

IEEE Access

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In this paper, we propose a lossless snubber cell for a soft-switched bidirectional buck-boost converter (BBC). The proposed snubber cell provides all switches with soft-switching conditions in both the bidirectional power flows of the BBC. In addition, the cell also achieves a relatively low circulating current for the snubber operation over a wide load range. In particular, the reverse recovery problem of the synchronous rectifier can be eliminated with the aid of the snubber inductor. Accordingly, the snubber cell enables high-frequency switching of approximately 60 kHz for all power switches and achieves high efficiency and high power density. Moreover, the proposed snubber cell does not have any auxiliary switch; therefore, complex auxiliary circuits or driving algorithms for the auxiliary switch are not required. Therefore, the proposed snubber cell has a simple structure with high reliability. To confirm the validity of the proposed lossless snubber cell, we provide detailed analyses, design guidelines, and experimental results using a 3-kW laboratory prototype.

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A novel zero voltage transition boost converter and artificial neural network‐based estimation of converter efficiency

Tınğ

Aslay

Şahin

2022

Circuit Theory & Apps

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In this paper, a novel zero voltage transition (ZVT) boost converter is proposed, and the overall efficiency of the converter is predicted with an artificial neural network (ANN) model. In the proposed converter, the main switch is turned on by ZVT and turned off by zero voltage switching (ZVS). Also, the other semiconductor elements operate by soft switching (SS). Besides, the proposed snubber cell has the bidirectional direct power transfer feature. The theoretical analyzes of the converter are verified by an prototype having 50 V DC input voltage, 100 V DC output voltage, 250 W output power, and 100 kHz switching frequency. The overall efficiency of the converter in hard switching (HS) condition is increased from 87.2% to 95.4% thanks to proposed snubber cell. Moreover, the efficiency of converter at HS operation is estimated with ANN. For this estimation, 110 efficiency values are obtained based on the different switching frequency and the output power values. When the actual efficiency measurements and the estimation results obtained with the ANN model are compared, it is seen that the results overlap and is obtained very close result to the truth by ANN. Thus, owing to the ANN model, the semiconductor power elements will not need to be operated at high frequencies and overheating, and the damaging to the elements will be prevented. Finally, the efficiency curve measurement of the converter takes long time in the experimental study when it takes highly short time as a few minutes in the estimation with ANN.

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Soft-Switching Bidirectional Buck/Boost Converter With a Lossless Passive Snubber

Cited by 15 publications

References 34 publications

In‐depth analysis of an RCD snubber applied to a DC‐DC boost converter

In‐depth analysis of an RCD snubber applied to a DC‐DC boost converter

Lossless Snubber Cell for a Soft-Switched Bidirectional Buck–Boost Converter

A novel zero voltage transition boost converter and artificial neural network‐based estimation of converter efficiency

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