scholarly journals Optimal Design of Multi-Output LLC Resonant Converter with Independently Regulated Synchronous Single-Switched Power-Regulator

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4341
Author(s):  
Sang Gab Park ◽  
Byoung Kuk Lee ◽  
Jong Soo Kim
Keyword(s):  
Electromagnetic Interference ◽  
Resonant Converter ◽  
Switching Losses ◽  
Zero Current Switching ◽  
Zero Current ◽  
Series Resonant ◽  
Power Switches ◽  
Voltage Doubler ◽  
Llc Resonant Converter ◽  
Secondary Side

This paper presents a tightly regulated multi-output isolated converter that employs only an independently regulated synchronous Single-Switched Post-Regulator (SSPR). The proposed converter is a highly accurate single-ended secondary side post-regulator based on a Series Resonant Converter (SRC); furthermore, it has a voltage-doubler characteristic. The proposed post-regulator requires only one auxiliary switch, in contrast with a bulky and expensive non-isolated DC–DC converter. Moreover, the added voltage-doubler can tightly regulate the slave output current. In addition, the voltage-doubler can improve electromagnetic interference characteristics and reduce switching losses arising from the Zero Current Switching (ZCS) operation of all power switches. The validity of the proposed converter is verified using experimental results obtained via a prototype converter applicable to an LED 3D TV power supply.

scholarly journals Non-isolated LLC resonant DC-DC converter with balanced rectifying current and stress

2020 ◽  
Vol 18 (2) ◽  
pp. 698
Author(s):  
Abdulhakeem Mohammed Dobi ◽  
Mohd Rodhi Sahid
Keyword(s):  
Experimental Result ◽  
Resonant Converters ◽  
Resonant Converter ◽  
Secondary Current ◽  
Zero Current Switching ◽  
Zero Current ◽  
Llc Resonant Converter ◽  
Resonant Inductor ◽  
Current Unbalance ◽  
Secondary Side

<p><span>In isolated type LLC resonant converters, transformer leakage inductances can be merged with the resonant inductor to extend the ZVS capability of the switches apart from isolation and voltage scaling. However, the transformer presents a resonant imbalance in the secondary side leading to secondary current unbalance, an increase in RMS value of the secondary current and increase thermal stress. This paper proposed a half-bridge non-isolated LLC resonant converter with a balanced rectifying current and stress in the rectifier diodes. The proposed converter can achieve the most advantages of isolated LLC converters, such as ZVS and low MOSFET turn-off loss. By the non-isolation method, secondary current and, transformer loss is significantly reduced. In addition, rectifier diodes operate with zero current switching and balanced rectifying current and stress over the entire operating range. The proposed non-isolated structure is verified by the experimental result with a 60W LLC resonant converter. </span></p>

Implementation of INC MPPT and CV Charging Using LLC Resonant Converter for Solar Streetlight System

2017 ◽  
Vol 27 (03) ◽  
pp. 1850043 ◽  
Author(s):  
Adrian S. T. Tan ◽  
S. Iqbal
Keyword(s):  
Power Systems ◽  
Environmental Conditions ◽  
Electromagnetic Interference ◽  
Design Procedure ◽  
Resonant Converter ◽  
Switching Loss ◽  
Battery Charging ◽  
Point Tracking ◽  
Zero Current Switching ◽  
Llc Resonant Converter

Most existing stand-alone photovoltaic (PV) power systems employ pulse-width-modulated (PWM) DC–DC converters for maximum power point tracking (MPPT) and battery charging control. However, PWM converters experience high switching loss and high electromagnetic interference when operating at high frequency. Therefore, this paper presents an incremental conductance (INC)-based MPPT with constant voltage (CV) charging using LLC resonant converter for stand-alone solar streetlight system. INC MPPT maximizes the PV power generation while CV charging ensures good battery charging characteristics. Both the INC MPPT and CV charging are implemented in an algorithm using an Arduino Uno board. Detailed design procedure as well as extensive design considerations for a 100[Formula: see text]W prototype LLC resonant converter are presented. Experimental results show good MPPT performance under various environmental conditions such as sudden rise or sudden drop of incident irradiance. Furthermore, the system shows exceptional robustness in toggling between INC MPPT mode and CV charging mode depending on the environmental conditions. The converter displays excellent switching operation by achieving primary-side zero voltage switching and secondary-side zero current switching for the entire design range.

scholarly journals Implementation of a Parallel-Series Resonant Converter with Wide Input Voltage Range

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4095 ◽  
Author(s):  
Bor-Ren Lin
Keyword(s):  
Input Voltage ◽  
Resonant Converter ◽  
Switching Loss ◽  
Switching Operation ◽  
Voltage Range ◽  
Power Diodes ◽  
Zero Current Switching ◽  
Zero Current ◽  
Power Switches ◽  
Parallel Series

A new resonant converter is presented to have the advantages of soft switching operation on power devices, without reverse recovery current loss on power diodes and wide input voltage range operation. Resonant converter with frequency modulation is adopted in the proposed circuit to accomplish the low switching loss on power switches and possible zero current switching operation on fast recovery diodes. To improve the problem of limit voltage range operation in the conventional resonant converter, a new parallel-series structure resonant converter is studied to achieve wide input voltage operation capability, such as from Vin,min to 4Vin,min. A 1.8 kW laboratory circuit is implemented, and the measured results are provided to confirm the theoretical analysis and circuit performance.

scholarly journals Resonant Converter with Voltage-Doubler Rectifier or Full-Bridge Rectifier for Wide-Output Voltage and High-Power Applications

Electronics ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 3 ◽  
Author(s):  
Bor-Ren Lin ◽  
Guan-Hong Lin ◽  
Aries Jian
Keyword(s):  
Output Voltage ◽  
Low Voltage ◽  
Resonant Circuit ◽  
Resonant Converter ◽  
Power Devices ◽  
Voltage Output ◽  
Power Switches ◽  
Bridge Rectifier ◽  
Voltage Doubler ◽  
Secondary Side

This paper presents a resonant converter with the benefits of wide output voltage, wide soft switching characteristics for power devices and high circuit efficiency. Since the series resonant circuit is adopted on the primary side, the power switches are turned on under zero voltage switching and power diodes on the secondary side can be turned off under zero current switching. To overcome the drawback of narrow voltage operation range in the conventional resonant converter, full-bridge rectifier and voltage-doubler rectifier topologies are employed on the secondary side for low-voltage output and high-voltage output applications. Therefore, the voltage rating of power devices on the secondary side is clamped at output voltage, rather than two times output voltage, in the center-tapped rectifier circuit. Synchronous power switches are used on the secondary side to further reduce the conduction losses so that the circuit efficiency can be further improved. To verify the theoretical analysis and circuit performance, a laboratory prototype with 1 kW rated power was built and tested.

scholarly journals A Bidirectional Double Uneven Power Converter Based DC–DC Converter for Solid-State Transformers

Electronics ◽  
2018 ◽  
Vol 7 (11) ◽  
pp. 334 ◽  
Author(s):  
Kiwoo Park ◽  
Kyo-Beum Lee
Keyword(s):  
Solid State ◽  
Distribution System ◽  
Power Flow ◽  
Power Converter ◽  
Small Scale ◽  
Power Semiconductor ◽  
Switching Losses ◽  
Zero Current Switching ◽  
Zero Current ◽  
Bidirectional Power Flow

This paper presents a novel bidirectional double uneven power (BiDUP) based dc-dc converter and its design and control methods. The proposed converter utilizes two dual active bridge (DAB) converters with different power ratings in a special way to realize zero current switching (ZCS), where both turn-on and turn-off switchings occur under the zero-current condition. A design example of the proposed BiDUP converter is presented for medium voltage (MV) and high-power solid-state transformer (SST) systems where both voltage transformation and bidirectional power flow are required. The main features of the proposed converter are to reduce both the switching losses in power semiconductor devices and the filter inductance requirement simultaneously. To verify the feasibility of the proposed converter, a simulation study on the BiDUP converter based SST in a distribution system is presented. Furthermore, to validate the operational principle of the proposed converter, an experimental study using a small-scale prototype is also presented.

scholarly journals On the Practical Evaluation of the Switching Loss in the Secondary Side Rectifiers of LLC Converters

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5915
Author(s):  
Manuel Escudero ◽  
Matteo-Alessandro Kutschak ◽  
Francesco Pulsinelli ◽  
Noel Rodriguez ◽  
Diego Pedro Morales
Keyword(s):  
Resonant Frequency ◽  
High Voltage ◽  
Low Voltage ◽  
Hysteresis Loss ◽  
Resonant Converters ◽  
Switching Loss ◽  
Operating Modes ◽  
Switching Losses ◽  
Series Resonant ◽  
Secondary Side

The switching loss of the secondary side rectifiers in LLC resonant converters can have a noticeable impact on the overall efficiency of the complete power supply and constrain the upper limit of the optimum switching frequencies of the converter. Two are the main contributions to the switching loss in the secondary side rectifiers: on the one hand, the reverse recovery loss (Qrr), most noticeably while operating above the series resonant frequency; and on the other hand, the output capacitance (Coss) hysteresis loss, not previously reported elsewhere, but present in all the operating modes of the converter (under and above the series resonant frequency). In this paper, a new technique is proposed for the measurement of the switching losses in the rectifiers of the LLC and other isolated converters. Moreover, two new circuits are introduced for the isolation and measurement of the Coss hysteresis loss, which can be applied to both high-voltage and low-voltage semiconductor devices. Finally, the analysis is experimentally demonstrated, characterizing the switching loss of the rectifiers in a 3 kW LLC converter (410 V input to 50 V output). Furthermore, the Coss hysteresis loss of several high-voltage and low-voltage devices is experimentally verified in the newly proposed measurement circuits.

Zero Current Switching Resonant Converter Based Parallel Balancing of Serially Connected Batteries String

2019 ◽  
Vol 55 (6) ◽  
pp. 7452-7460 ◽  
Author(s):  
Ilya Zeltser ◽  
Michael Evzelman ◽  
Alon Kuperman ◽  
Mor Mordechai Peretz
Keyword(s):  
Resonant Converter ◽  
Current Switching ◽  
Zero Current Switching ◽  
Zero Current
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