Analysis and Control of Critical Conduction Mode High-Frequency Single-Phase Transformerless PV Inverter

Son, Gibong; Huang, Zhengrong; Li, Qiang; Lee, Fred C.

doi:10.1109/tpel.2021.3078135

Cited by 24 publications

(8 citation statements)

References 21 publications

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“…The TCM or CrM operation can only be realized when knowing the instantaneous inductor current zero-crossing point at the switching frequency by using the ZCD circuit. Most of the TCM or CrM DC-AC converters [12], [15] rely on the ZCD circuit to detect the inductor zero-crossing point for reliable ZVS realization. In these ZCD-based control, the inductor current is regulated within the current band, but the instantaneous current sensing is reported to be error-prone [15] and lossy in high-frequency applications.…”

Section: ) Low Turn-off Current and Associated Voltage Stressmentioning

confidence: 99%

“…Such large variation yields excessive turn-OFF loss [3], as well as core and winding loss of the inductor [10] in high-frequency ranges. In a twolevel topology, this drawback could be alleviated by swapping between bipolar and unipolar modulations [11], between CrM and DCM operations [12], between TCM and DCM [13], or implementing a variable valley current [10] or peak current [8] control to reduce the wide high-frequency range. In [14], an alternative multi-level phase bridge is used to address the issue from the perspective of topology.…”

Section: Introductionmentioning

confidence: 99%

“…The detailed operation optimization based on the loss distribution and mode transition is discussed in Section III, accompanied by a comparison to other solutions in terms of circuit, control and efficiency. In Section IV, a 4.4 kW prototype of which the power rating is significantly higher than other soft-switching inverters (2.4 kW in [12] and 2.2 kW in [3]), has been used to test the HQCCM. Experimental results show high efficiency, 98.3% and 98.4% at the full and half load, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hybrid-Mode Adaptive Zero-Voltage Switching for Single-Phase DC–AC Conversion With Paralleled SiC MOSFETs

Jiang

Shen

Shillaber

et al. 2022

IEEE Trans. Power Electron.

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State-of-the-art soft-switching modulations such as critical conduction mode (CrM) and Triangular Current Mode (TCM) increase the conduction loss of power semiconductors and require variable switching frequencies, thus these soft-switching methods are seldom used in high-power DC-AC conversion. To achieve soft-switching while maintaining low RMS currents, this article proposes a Hybrid Quadrilateral and Continuous Current Mode (HQCCM) modulation for general high-frequency singlephase DC-AC conversion based on paralleled SiC MOSFETs. The proposed HQCCM adaptively operates in soft-switching Quadrilateral Current Mode (QCM) or hard-switching Continuous Conduction Mode (CCM) in one AC line cycle depending on the instantaneous AC load current. Thus, high efficiencies can be achieved over the full power range. This HQCCM modulation features adaptive soft-switching, constant switching frequency, compatibility to line filter and is applicable for high-power applications. A 4.4-kW single-phase DC-AC inverter is developed and tested to verify the advantages of the HQCCM. This article is accompanied by a video demonstrating the effectiveness of the proposed HQCCM in varying load scenarios.

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Section: ) Low Turn-off Current and Associated Voltage Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hybrid-Mode Adaptive Zero-Voltage Switching for Single-Phase DC–AC Conversion With Paralleled SiC MOSFETs

Jiang

Shen

Shillaber

et al. 2022

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…This modulation will lead to a large variation in the switching frequency, so it is necessary to determine the maximum and minimum switching frequency in the operating condition. For the convenience of analysis, the influence of C and L 2 on TCM current will be ignored [4] . The switching time can be calculated by Equations ( 2) and (3).…”

Section: Calculation Of Switching Frequency Rangementioning

confidence: 99%

Implementation of TCM grid-connected inverter based on STM32

Ren

2022

J. Phys.: Conf. Ser.

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In this paper, STM32 is used to realize the control of TCM grid-connected inverter, which replaces the traditional control mode of digital logic controller and MCU combination, and simplifies the controller structure. A simple method for calculating the negative driving voltage of gallium nitride is presented. In this paper, the circuit parameters of each part of TCM inverter are designed, and the design scheme of each part of the circuit is given. Finally, a 200W prototype is built to verify the feasibility of the design scheme.

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“…As the wide bandgap (WBG) semiconductor devices based on gallium nitride (GaN) are better in the figure of merit than that of state-of-the-art silicon (Si) devices [1][2][3], they have distinct advantages in designing high frequency convertors with high power density, high efficiency, and fast response characteristics [4][5][6]. Once GaN technology and its application are fully developed, the performance of convertors in many applications, such as the energy storage system [7], electric vehicles [8,9], photovoltaics [10], and electric aircraft [11,12], will be increased to a much higher level.…”

Section: Introductionmentioning

confidence: 99%

An integrated modelling and parameter design method for the RC snubber in novel cascode GaN‐based bridge convertors

Luo

2022

IET Power Electronics

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The utilization of novel cascode GaN devices can significantly increase the power density and the efficiency of convertors. However, owing to high switching speed (high dv/dt or di/dt) and inevitable parasitic inductance in device packages and external circuits, cascode GaN devices are more prone to oscillate, resulting in voltage overshoot, electromagnetic interference (EMI), and even device breakdown, which reduces the reliability of the drive system. Therefore, effective suppression of the switching oscillation becomes highly critical. This paper presents an integrated modelling and a parameter design method for cascode GaN‐based bridge convertors. Firstly, a high‐frequency equivalent circuit model is derived for the switching oscillation of cascode GaN‐based bridge convertors. Secondly, a quantitative RC snubber parameter design method is established based on root locus analysis, which makes up for defects of the previous trial‐and‐error empirical method. Then impacts of the RC snubber on power loss and EMI are also studied, with the optimal snubber resistance and capacitance obtained by minimizing power loss. Finally, the effect of oscillation suppression is verified by simulation and experiment, and results show good agreement with the theoretical analysis.

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Analysis and Control of Critical Conduction Mode High-Frequency Single-Phase Transformerless PV Inverter

Cited by 24 publications

References 21 publications

Hybrid-Mode Adaptive Zero-Voltage Switching for Single-Phase DC–AC Conversion With Paralleled SiC MOSFETs

Hybrid-Mode Adaptive Zero-Voltage Switching for Single-Phase DC–AC Conversion With Paralleled SiC MOSFETs

Implementation of TCM grid-connected inverter based on STM32

An integrated modelling and parameter design method for the RC snubber in novel cascode GaN‐based bridge convertors

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