A5073338567- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Microgrid Control and Optimization
- Wireless Power Transfer Systems
- Energy Harvesting in Wireless Networks
- Silicon Carbide Semiconductor Technologies
- HVDC Systems and Fault Protection
- Advancements in Semiconductor Devices and Circuit Design
- RFID technology advancements
- Semiconductor materials and devices
- Innovative Energy Harvesting Technologies
- Advanced Battery Technologies Research
- High-Voltage Power Transmission Systems
- Railway Systems and Energy Efficiency
- Advancements in Battery Materials
- Induction Heating and Inverter Technology
Xi'an Jiaotong University
2020-2025
State Key Laboratory of Electrical Insulation and Power Equipment
2022-2025
The bidirectional CLLC resonant converter has distinguished potential in battery chargers and energy storage systems for its advantages soft switching power flow capability. However, traditional converters generally adopt symmetrical design to maintain characteristics, which means the secondary <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> network is designed be equal primary after reflection. only suitable voltage grade matching...
For bidirectional <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">CLLC</i> resonant converters, synchronous rectification (SR) is a key technique that can reduce the conduction losses in rectifying side by replacing diodes with switches' channel. However, existing methods suffer from either complex hardware, or incomplete and imprecise control effect. Aiming at solving these problems, this article proposes digital sensorless SR algorithm...
The power electronic transformer (PET) based on a cascade connection of modular multilevel converter (MMC) submodules with dual active bridges (DAB) is promising topology for future hybrid ac/dc distribution grids. voltage ripple suppression great importance the density improvement this topology. However, traditional control strategies suffer from steady-state errors, couplings among different loops, and considerable extra loss. This article presents comprehensive closed-loop scheme...
For bidirectional CLLC resonant converters, synchronous rectification (SR) is a key technique that can reduce the conduction losses by replacing diodes to bring an improvement of performance. Unfortunately, existing methods suffer from high cost, complex hardware and imprecise control effect. Aiming at these problems, this paper proposes digital sensor-less SR algorithm based on time domain model for symmetrical converters under pulse frequency modulation (PFM). The developed approach enable...
Mainstream adaptive drain-source voltage-sensingbased synchronous rectification (ADVS-SR) has rarely been used for <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">CLLC</i> convertersin higher output-voltage applications (HOVA) due to the issue of sensing accuracy and high dv/dt. This letter proposes a novel body-diode-conduction (BDC) extraction circuit consisting an accurate DVS customized valleyconduction-detection (VCD) ADVS-SR in HOVA....
Synchronous rectification (SR) is an essential aspect for <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> resonant converters to achieve high-efficiency design, and the mainstream SR method adaptive directly voltage-sensing-based (ADVS-SR), where drain–source voltage of switch sensed. However, due presence parasitic capacitor transformer output capacitors switches, undeserved bode-diode conduction (BDC) caused by intricate ringing...
A novel bidirectional <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCCL</i> resonant dc–dc converter is proposed in this article. By substituting the magnetizing inductance of xmlns:xlink="http://www.w3.org/1999/xlink">CLLC</i> with a parallel capacitor, obtains enhanced voltage gain regulation capability compared to while maintaining zero-voltage switching (ZVS) for inverting side and zero-current rectifier during power flow. The state...
The isolated bidirectional dc transformer (DCX) based on CLLC resonant converter has been extensively investigated for solid-state application due to its open-loop constant voltage gain at frequency and zero-voltage switching (ZVS) characteristics. However, owing the complex multi-resonance mechanism of fourth-order tank, traditional first harmonic approximation (FHA) cannot accurately describe time domain response which may lead inability CLLC-DCX achieve ZVS obtain unity under light load...
This paper proposes a novel dual-feedforward (DFF) control strategy for LLC resonant converters, which can not only improve the dynamic performance of inverter-control, but also introduce feedforward to conventional synchronous rectifier-control. The proposed DFF is based on time-domain model (TDM) converters with high accuracy over whole operating range, where complex mode recognition be discarded. optimize both soft-start process and by containing information input voltage, output current,...
To address the wide voltage conversion requirements in field of battery charging, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCL</i> resonant tank adopting pulse frequency modulation is investigated utilizing time-domain model (TDM) this article. exhibits similar soft switching characteristics and enhanced gain regulation capability with a simpler than existing classic xmlns:xlink="http://www.w3.org/1999/xlink">CLLC</i> . The operating...
The Vienna rectifier is a promising unidirectional topology, however, the current zero-crossing distortion (ZCD) issue increases THD of phase and causes spike. This paper analyzes mechanism ZCD from perspective ripple in time domain, it revealed that floating-state vector (FSV) interval near point inherent culprit ZCD, according to that, compensation (ZCDC) method based on space-vector modulation (SVM) proposed this paper. ZCDC eliminates FSV injection zero-sequence component. Finally,...