Magnetic-Coupling Current-Balancing Cells based Input-parallel Output-parallel (IPOP) LLC Resonant Converter Modules for High-Frequency Isolation of DC Distribution Systems

Liu, Chuang; Xinzhe, Xu; Dacheng, He; Liu, Haiyang; Tian, Xiaotong; Guo, Ying; Cai, Guowei; Ma, Chenglian; Mu, Gang

doi:10.1109/tpel.2015.2507172

Cited by 63 publications

(30 citation statements)

References 34 publications

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“…Each circuit can transfer one-half rated power to the secondary side. The magnetic core [20] is used to balance i Lr1 and i Lr2 . Under the balanced primary currents (|i Lr1 | = |i Lr2 |), the induced voltages V L1 and V L2 are zero.…”

Section: Circuit Structure and Principle Of Operationmentioning

confidence: 99%

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Analysis of a DC Converter with Low Primary Current Loss and Balance Voltage and Current

Lin

2019

Electronics

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A dc/dc pulse width modulation (PWM) circuit was investigated to realize the functions of reduced primary current loss and balanced voltage and current distribution. In the presented dc/dc converter, two full bridge pulse width modulation circuits were used with the series/parallel connection on the high-voltage/low-voltage side. The flying capacitor was adopted on the input side to achieve voltage balance on input split capacitors. The magnetic coupling element was employed to achieve current sharing between two parallel circuits. A capacitor-diode passive circuit was adopted to lessen the primary current at the commutated interval. The phase-shifted duty cycle control approach was employed to regulate load voltage and implement soft switching characteristics of power metal-oxide-semiconductor field-effect transistors (MOSFETs). Finally, the experimental results using a 1.68 kW prototype converter were obtained to confirm the performance and feasibility of the studied circuit topology.

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Section: Circuit Structure and Principle Of Operationmentioning

confidence: 99%

“…However, the current between each modular circuit may be 2 of 15 unbalanced. To accomplish current balance issue, several current balancing approaches have been presented in [19,20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a DC Converter with Low Primary Current Loss and Balance Voltage and Current

Lin

2019

Electronics

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“…Therefore, the soft switching turn-on of power switches can be achieved, and the circuit efficiency is improved. The magnetic coupling current balance [19] cells, MC 1 and MC 2 , are used on the primary side to achieve current balance for each half-bridge circuit. Therefore, the current unbalance issue of modular converters is overcome.…”

Section: Circuit Diagram and Principles Of Operationmentioning

confidence: 99%

“…Therefore, the power rating of each half bridge circuit is one-third of load power, P o /3. In order to balance the modular currents, the magnetic coupling (MC) current balance cells are presented and discussed in [19]. Therefore, the magnetic coupling current balance components MC 1 and MC 2 are used in the proposed converter to achieve current balance issue between three half bridge circuits.…”

Section: Circuit Characteristicsmentioning

confidence: 99%

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Soft Switching DC Converter for Medium Voltage Applications

Lin¹

2018

Electronics

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A dc-dc converter with asymmetric pulse-width modulation is presented for medium voltage applications, such as three-phase ac-dc converters, dc microgrid systems, or dc traction systems. To overcome high voltage stress on primary side and high current rating on secondary side, three dc-dc circuits with primary-series secondary-parallel structure are employed in the proposed converter. Current doubler rectifiers are used on the secondary side to achieve low ripple current on output side. Asymmetric pulse-width modulation is adopted to realize soft switching operation for power switches for wide load current operation and achieve high circuit efficiency. Current balancing cells with magnetic component are used on the primary side to achieve current balance in each circuit cell. The voltage balance capacitors are also adopted on primary side to realize voltage balance of input split capacitors. Finally, the circuit performance is confirmed and verified from the experiments with a 1.44 kW prototype.

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Interleaved high conversion ratio DC–DC converter with output self‐balancing and current auto‐sharing for DC nanogrid application

Chen

Feng

Chen

et al. 2022

Circuit Theory & Apps

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In the application of bipolar DC bus configuration in the DC nanogrid, the unbalanced voltage of two outputs in bipolar DC bus, due to the unbalanced conditions of loads and/or energy sources, will cause deterioration of the power quality of the bus and may damage the switch, affecting the stability and safety of the system. In order to solve the problem of unbalanced voltage of two outputs, interleaved series capacitor based dual‐output converter with a high conversion ratio is presented in this paper. By applying negative current mode (NCM) to the main inductor, the character of two‐output self‐balancing and zero voltage switching (ZVS) of all switches for such this topology configuration is achieved. In the NCM mode, the parallel diodes of main switches are not conducted during dead time and guarantee the flowing path to load side. Thus, based on this condition, volt‐second balance of main inductor is obtained to get the character of two‐output self‐balancing. Furthermore, by adopting series capacitor in the proposed topology and based on the charge‐balance of the intermediate block capacitor, inductor current existed in the two phase could be auto‐sharing. Comprehensive operational principle analysis, loss analysis, and efficiency of the proposed converter under different load conditions have been given, and the comparison analysis of three operation modes and selection of negative current mode is clarified. Small signal model of the proposed converter is described to convenient for the controller design. Finally, simulation results and a 20–220 V prototype are built to verify the character analysis of the proposed converter.

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Magnetic-Coupling Current-Balancing Cells based Input-parallel Output-parallel (IPOP) LLC Resonant Converter Modules for High-Frequency Isolation of DC Distribution Systems

Cited by 63 publications

References 34 publications

Analysis of a DC Converter with Low Primary Current Loss and Balance Voltage and Current

Analysis of a DC Converter with Low Primary Current Loss and Balance Voltage and Current

Soft Switching DC Converter for Medium Voltage Applications

Interleaved high conversion ratio DC–DC converter with output self‐balancing and current auto‐sharing for DC nanogrid application

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