Automatic current balancing for two-phase interleaved LLC resonant converter

Kim, Jeonghun; Naseem, Nabeel; Cha, Honnyong

doi:10.1007/s43236-022-00583-y

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…Multiplying the RMS input voltage given by ( 6) and the RMS input current I s(RMS) , which can be obtained by manipulating (9), one can determine the apparent power in (28). Since the power factor pf corresponds to the ratio between the active and apparent powers, one can calculate it from (29). The power factor as a function of the phase-shift angle and switching frequency is shown in Figure 5, tending to a maximum value as ϕ decreases to 0 .…”

Section: Power Flow Analysismentioning

confidence: 99%

“…Wei et al 28 introduce a simple online resonant frequency tracking approach based on the unity gain operation characteristic of LLC converters to minimize the circulating current and reactive content when the circuit operates below the resonance frequency. In turn, the interleaved LLC converter in Kim et al 29 can achieve automatic current without requiring additional active or passive components, costly sensors, and dedicated control schemes, but it is not possible to ensure the operation under soft switching condition over the entire load range. A flexible transition control strategy is designed in Feng et al 30 to obtain a wide voltage gain based on multimode switching in a three‐phase staggered LLC resonant converter, whose soft‐switching range also varies according to the load power.…”

Section: Introductionmentioning

confidence: 99%

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Three‐phase bidirectional isolated LLC resonant DC‐DC converter for DC microgrid applications

Santos

Henn

Oliveira

et al. 2023

Circuit Theory & Apps

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SummaryDC microgrids rely strongly on bidirectional dc‐dc converters responsible for managing the power flow among distinct loads and renewable energy sources like fuel cells and batteries. In this context, this work presents a three‐phase inductor‐inductor‐capacitor (LLC) resonant dc‐dc converter with high‐frequency isolation and bidirectional power flow capability, employing phase‐shift control and frequency modulation. The resonant tank takes advantage of using the leakage inductance and the magnetizing inductance of the high‐frequency transformer (HFT), which allows for improving power density. The active switches operate with a fixed duty ratio of 50% so that the converter can always achieve zero‐voltage switching (ZVS). The mathematical analysis is carried out based on a single‐phase representation of the converter, which considers only the fundamental components. A dynamic model is derived using the gyrator theory, which allows representing the converter as a frequency‐controlled current source to regulate the output voltage. In addition, the power flow direction is determined from the estimation of an ideal phase‐shift angle for each frequency aiming to control the output power. An experimental prototype is implemented and thoroughly assessed to demonstrate that the introduced topology is feasible for dc microgrids and other applications that require bidirectional power flow.

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Section: Power Flow Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three‐phase bidirectional isolated LLC resonant DC‐DC converter for DC microgrid applications

Santos

Henn

Oliveira

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…However, the transient time remains at the millisecond level. A backpropagation neural network (BPNN) algorithm is introduced to PI control to improve the transient performance in an LLC resonant converter with nonlinear voltage gain [30], but the regulation of the operating frequency of the LLC converter is undesirably rough. Moreover, due to the complexity of the nonlinear digital control method, it is hard to apply to the practical application.…”

Section: Introductionmentioning

confidence: 99%

Transient response improvement of half‐bridge LLC resonant converter with full‐bridge rectifier for DC microgrid

Ma,

Cao,

et al. 2023

IET Renewable Power Gen

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LLC resonant converter has the features of low noise, high efficiency and power density, which is suitable to be integrated into DC microgrid. Due to severe stresses in the resonant tank, achieving fast and safe transient performance has been challenging for resonant converters. With less switch number and voltage stress, half‐bridge LLC resonant converter with full‐bridge rectifier (H‐F LLC resonant converter) are more suitable for high‐voltage application. To improve the transient response of the converter, this paper proposes a method based fixed center state trajectory for the converter to achieve soft start‐up. To reduce dynamic response time during start‐up, each step of fixed center state‐trajectory is designed optimally for the shortest path with symmetrical current limitation. In addition, the proposed method is also applicable to full‐bridge LLC converters. Moreover, according to the state‐plane analysis, load stepping‐up and stepping‐down transient state trajectories with the shortest path are carried out as well. To minimize the adverse effect of digital delay, fast load transient control based on 3D look‐up table is given based on FPGA‐EP3C25E144I7, which would also significantly reduce the computation requirement of the hardware controllers. The experimental results are verified on a 380V/12V LLC converter prototype at 130 kHz.

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Design and implementation of 1000 V 20 kW power module for electric vehicle fast charger

Lee,

Park,

Cho

et al. 2023

J. Power Electron.

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Automatic current balancing for two-phase interleaved LLC resonant converter

Cited by 4 publications

References 21 publications

Three‐phase bidirectional isolated LLC resonant DC‐DC converter for DC microgrid applications

Three‐phase bidirectional isolated LLC resonant DC‐DC converter for DC microgrid applications

Transient response improvement of half‐bridge LLC resonant converter with full‐bridge rectifier for DC microgrid

Design and implementation of 1000 V 20 kW power module for electric vehicle fast charger

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