High-Switching-Frequency TCM Digital Control for Bidirectional-Interleaved Buck Converters Without Phase Error for Battery Charging

Liu, Yuchen; Syu, Yong-Long; Dung, Nguyen Anh; Chen, Chen; Chen, Kai-De; Kim, Katherine A.

doi:10.1109/jestpe.2019.2954602

Cited by 36 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Steady-state current imbalance among the multiphase inductors is inevitable due to small mismatches in the timing of switching signals, differing switching characteristics of semiconductor devices, and unequal inductor impedances [35], [47], [61]. Therefore, current balancing schemes are required in the CCM and TCM multiphase interleaved converters [35], [45], [62].…”

Section: Comparison With Ccm/tcm Multiphase Interleavingmentioning

confidence: 99%

“…Therefore, this technique is seldom used in applications over 50 kW. Another issue with the TCM multiphase interleaving is its high implementation complexity owing to the requirements of high-speed zero current detection (ZCD) circuit and accurate timing for ZVS [30], [46], [47]. By comparison, it is relatively easier for the CCM multiphase interleaving and the proposed desynchronizable paralleling scheme to be implemented.…”

Section: Comparison With Ccm/tcm Multiphase Interleavingmentioning

confidence: 99%

“…Recently, the triangular-current-mode (TCM) multiphase interleaving has attracted increasing research attention owing to its soft-switching characteristics for all switches [43]- [45]. This approach requires high-speed zero current detection (ZCD) and accurate timing for the zero-voltage switching (ZVS) realization, and therefore its implementation complexity is high [30], [46], [47].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Desynchronizing Paralleled GaN HEMTs to Reduce Light-Load Switching Loss

Shen

Shillaber

Zhao

et al. 2020

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

Parallel connection of GaN high-electron-mobility transistors (HEMTs) is a more cost-effective or even an unavoidable solution to achieve higher current ratings. As the load decreases, however, the switching loss of paralleled HEMTs becomes dominant over the conduction loss, and the overall power conversion efficiency drops sharply. To reduce the light-load switching loss, this paper proposes a desynchronizable paralleling scheme. The midpoint (AC terminal) of each paralleled HEMT half bridge is connected with a commutation inductor, which thus, enables two operation modes: synchronous and asynchronous modes. The synchronous mode is activated at heavy loads to share the high current; the added commutation inductors lead to better current sharing than the direct parallel. When operating at light loads, however, the paralleled devices are desynchronized to generate a circulating current flowing through the commutation inductors. The circulating current enables the lagging HEMTs to achieve the zero-voltage switching (ZVS) and allows the leading ones to turn on at a current lower than the load, thereby significantly reducing the total switching loss. In addition, a thermal balancing scheme is proposed to alleviate the thermal stress imbalance between the desynchronized GaN HEMTs. The operating principle and design guidelines of the desynchronizable paralleling scheme are detailed. Finally, experimental results from multi-pulse and continuous tests of GaN HEMTs are provided to verify the advantages of the proposed paralleling scheme in reducing light-load switching loss and improving light-load efficiency.

show abstract

Section: Comparison With Ccm/tcm Multiphase Interleavingmentioning

confidence: 99%

Section: Comparison With Ccm/tcm Multiphase Interleavingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Desynchronizing Paralleled GaN HEMTs to Reduce Light-Load Switching Loss

Shen

Shillaber

Zhao

et al. 2020

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…The TCM multiphase interleaving technique [29], [32]- [34] enables all MOSFETs to achieve ZVS for minimized switching loss. This approach, however, requires high-speed zero-current detection, featuring high implementation complexity [31].…”

Section: Introductionmentioning

confidence: 99%

Quadrilateral Current Mode Paralleling of Power MOSFETs for Zero-Voltage Switching

Shen

Jiang

Zhao

et al. 2021

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

This paper proposes a generic zero-voltage switching (ZVS) scheme for parallel power MOSFETs. Uncoupled or inversely-coupled differential-mode (DM) commutation inductors are added to the midpoints (AC terminals) of parallel MOSFET half-bridges (HBs), and a time-delay-based control scheme is applied, generating a circulating current flowing through these commutation inductors. Thus, the inductor currents are reshaped as quadrilaterals, which enable all the parallel transistors to achieve ZVS. The mode of operation of the proposed paralleling technique is entitled quadrilateral current mode (QCM) due to the quadrilateral-shaped commutation inductor currents. The operating principle of the QCM-paralleling technique is detailed mathematically, yielding accurate closed-form analytical expressions for modulation parameters. Finally, simulations and experimental results of a QCM-enabled synchronous Buck dc-dc converter are presented to validate the theoretical considerations. Index Terms-Parallel power MOSFETs, zero-voltage switching (ZVS), quadrilateral current mode (QCM)

show abstract

“…Moreover, the battery is used in ICT equipment as a backup power supply. Normally, the first stage provides isolation and high conversion efficiency, and the second stage is usually a non-isolated DC-DC converter due to its advantages such as simple structure, low cost, and high power density [4][5][6][7]. In this case, the conventional buck converter has been discussed for using in the second stage.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Zero-Voltage-Switching Condition in a High-Voltage-Gain Bidirectional DC–DC Converter

et al. 2021

Self Cite

View full text Add to dashboard Cite

This paper analyzes the zero-voltage switching (ZVS) for all switches in a high-voltage-gain bidirectional DC–DC converter in triangular conduction mode (TCM) operation without any auxiliary components. From the ZVS condition, the reverse inductor current can be derived, and the required dead-time duration between the main switches and SR switches can be determined, which leads to a reduction in the duty cycle loss. Moreover, the relationship between switching frequency and load in TCM operation can be determined, which helps to reduce the peak-to-peak inductor current and reduce the conduction loss at light load. An experimental prototype of a high-voltage-gain bidirectional DC–DC converter is implemented with a maximum output power of 48 W. The result shows the peak efficiency of 97% and 96.8% in the forward and reverse directions, respectively.

show abstract

High-Switching-Frequency TCM Digital Control for Bidirectional-Interleaved Buck Converters Without Phase Error for Battery Charging

Cited by 36 publications

References 27 publications

Desynchronizing Paralleled GaN HEMTs to Reduce Light-Load Switching Loss

Desynchronizing Paralleled GaN HEMTs to Reduce Light-Load Switching Loss

Quadrilateral Current Mode Paralleling of Power MOSFETs for Zero-Voltage Switching

An Investigation of Zero-Voltage-Switching Condition in a High-Voltage-Gain Bidirectional DC–DC Converter

Contact Info

Product

Resources

About