Brief review on snubber circuits

Garcia-Caraveo, Alberto; Soto, Angel; Gonzalez, Rafael; Bañuelos-Sánchez, P.

doi:10.1109/conielecomp.2010.5440754

Cited by 15 publications

(3 citation statements)

References 3 publications

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“…Specifically, the 5L-DCC in Fig. 1 uses the auxiliary resistors R p [23] and absorber circuits R s and C s [24]- [25], which can better balance the voltage stress on the diodes and switching devices. Also, the 5L-DCC above has the specific switching mechanism as shown in Fig.…”

Section: A Basic Principlementioning

confidence: 99%

An Improved Capacitor Voltage-Balancing Method for Five-Level Diode-Clamped Converters With High Modulation Index and High Power Factor

Zhao

Huang

2016

IEEE Trans. Power Electron.

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The capacitor voltage imbalance is a critical issue of five-level diode-clamped converters (5L-DCC). To address this issue, an inner-hexagon-vector-decomposition based space vector modulation (VDSVM-H1) approach is provided in the literature, which obtains the capacitor voltage balancing with high modulation index and high power factor but renders some drawbacks. To overcome these shortcomings, a novel capacitor voltage balancing method is proposed here. First, the previous VDSVM-H1 approach is modified by introducing six new vector sequences to each triangle and applying a new vector selection rule such that the converter will not violate the 5L-DCC switching mechanism in all operating conditions. Second, the variation of the line-to-line voltage output in one sampling period is restricted to one-or two-level in the optimized region, instead of the three-level in the previous VDSVM-H1 approach, which means less harmonics generating in the ac-side outputs. Finally, the simulation and experimental results show that the proposed method can improve the VDSVM-H1 with convincing results.Index Terms-Capacitor voltage balancing, five-level diode clamped converter, high modulation index, high power factor, total harmonic distortion (THD). 0885-8993 (c)

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Section: A Basic Principlementioning

confidence: 99%

An Improved Capacitor Voltage-Balancing Method for Five-Level Diode-Clamped Converters With High Modulation Index and High Power Factor

Zhao

Huang

2016

IEEE Trans. Power Electron.

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“…The spike voltage will increase the power losses and the voltage stresses of IGBT. A passive or active snubber is required to clamp the spike voltage [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

A safe commutation strategy based on LRCD snubber circuit for five‐level active neutral point clamped inverter

Nie

Zhu

et al. 2021

IET Power Electronics

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Spike voltage generated during the turn‐off transient is one of the key threats to IGBT. When the traditional RCD snubber is applied in the five‐level active neutral point clamped (5L‐ANPC) inverter to clamp the spike voltage, a transient large current caused by the charging of the snubber capacitor will increase power losses and current stresses of IGBTs. This study proposes a LRCD snubber for the 5L‐ANPC inverter. It can effectively suppress the spike voltages and the transient large currents of IGBTs, thus reducing the power loss. For the 5L‐ANPC inverter, the traditional commutation method also poses a threat to IGBTs. Near the zero‐crossing point of the output voltage, the traditional commutation method will cause the IGBTs that operate at the carrier frequency to withstand three times of the rated voltage. This study proposes a safe commutation strategy based on the LRCD snubber. When the output voltage passes through zero‐crossing point, the proposed commutation strategy uses four transition switching states to avoid the breakdown of IGBTs induced by overvoltage. It can ensure that all the IGBTs operate in the safe operating area (SOA). Experimental results are presented to verify the validity of the proposed method.

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“…To reduce the amplitude of the voltage surge on IGBTs, a snubber circuit must be added to the inverter, such as the C, RC, RCD, or RCD with clamp snubber circuits, as shown in Fig. 1 [1–4].…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of snubber circuit for Z‐source inverter applications

Dong

Zhang

Cheng

2016

IET Power Electronics

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The Z-source inverter (ZSI) is a topology with many advantages for power electronics interfaces. Shoot-through states are utilised to boost the DC-link voltage. This study shows that traditional C, RC, RCD, and RCD clamp snubber circuits are not suitable for ZSI. When these snubber circuits are used for ZSI, there will be a distortion in the DC-link voltage, and this voltage will be higher than that without the snubber circuits. The shoot-through state causes larger energy losses, which greatly lowers the efficiency of ZSI. This study presents an improved RCD snubber circuit for ZSI applications. This design reduces the voltage distortion and energy losses. In addition, the theoretical analysis and design guidelines for snubber circuits of ZSI are confirmed by computer simulation and experimental verification. Nomenclature d s Shoot-through duty ratio f s Switching frequency T s Switching cycle m Modulation index |Z| Impedance of load cos j Power factor of load V in DC source voltage V dc DC-link voltage I dc DC-link current I L Current of inductor of the Z-source network v L Voltage of inductor of the Z-source network V C Voltage of capacitor of the Z-source network R s , C s Resistance and capacitance of snubber v cs , i cs Voltage and current of snubber capacitor i Rs Current of snubber resistor i ph Peak value of the phase current t off Turn off time of IGBT

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Brief review on snubber circuits

Cited by 15 publications

References 3 publications

An Improved Capacitor Voltage-Balancing Method for Five-Level Diode-Clamped Converters With High Modulation Index and High Power Factor

An Improved Capacitor Voltage-Balancing Method for Five-Level Diode-Clamped Converters With High Modulation Index and High Power Factor

A safe commutation strategy based on LRCD snubber circuit for five‐level active neutral point clamped inverter

Analysis and design of snubber circuit for Z‐source inverter applications

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