scholarly journals Analysis of a Wide Voltage Hybrid Soft Switching Converter

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 473 ◽  
Author(s):  
Bor-Ren Lin ◽  
Yen-Chun Liu
Keyword(s):  
Power Conversion ◽  
Input Voltage ◽  
Soft Switching ◽  
Resonant Converter ◽  
Solar Pv ◽  
Load Range ◽  
Pwm Converter ◽  
Load Voltage ◽  
Zero Voltage Switching ◽  
Circulating Current

A hybrid PWM converter is proposed and investigated to realize the benefits of wide zero-voltage switching (ZVS) operation, wide voltage input operation, and low circulating current for direct current (DC) wind power conversion and solar PV power conversion applications. Compared to the drawbacks of high freewheeling current and hard switching operation of active devices at the lagging-leg of conventional full bridge PWM converter, a three-leg PWM converter is studied to have wide input-voltage operation (120–600 V). For low input-voltage condition (120–270 V), two-leg full bridge converter with lower transformer turns ratio is activated to control load voltage. For high input-voltage case (270–600 V), PWM converter with higher transformer turns ratio is operated to regulate load voltage. The LLC resonant converter is connecting to the lagging-leg switches in order to achieve wide load range of soft switching turn-on operation. The high conduction losses at the freewheeling state on conventional full bridge converter are overcome by connecting the output voltage of resonant converter to the output rectified terminal of full bridge converter. Hence, a 5:1 (600–120 V) hybrid converter is realized to have less circulating current loss, wide input-voltage operation and wide soft switching characteristics. An 800 W prototype is set up and tested to validate the converter effectiveness.

scholarly journals Extension of Zero Voltage Switching Capability for CLLC Resonant Converter

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 818
Author(s):  
HwaPyeong Park ◽  
DoKyoung Kim ◽  
SeungHo Baek ◽  
JeeHoon Jung
Keyword(s):  
Input Voltage ◽  
Voltage Gain ◽  
Resonant Converter ◽  
High Power Conversion Efficiency ◽  
Load Range ◽  
Zero Voltage Switching ◽  
Voltage Variation ◽  
Sinusoidal Current ◽  
Zero Voltage ◽  
Voltage Switching

TheCLLC resonant converter has been widely used to obtaina high power conversion efficiency with sinusoidal current waveforms and a soft switching capability. However, it has a limited voltage gain range according to the input voltage variation. The current-fed structure canbe one solution to extend the voltage gain range for the wide input voltage variation, butit has a limited zero voltage switching (ZVS) range. In this paper, the current-fed CLLC resonant converter with additional inductance is proposed to extend the ZVS range. The operational principle is analyzed to design the additional inductance for obtaining the extended ZVS range. The design methodology of the additional inductance is proposed to maximize the ZVS capability for the entire load range. The performance of the proposed method is verified with a 20 W prototype converter.

scholarly journals DC Converter with Wide Soft Switching Operation, Wide Input Voltage and Low Current Ripple

2020 ◽  
Vol 10 (13) ◽  
pp. 4672 ◽  
Author(s):  
Bor-Ren Lin ◽  
Guan-Hong Lin
Keyword(s):  
Pulse Width Modulation ◽  
Current Source ◽  
Input Voltage ◽  
Soft Switching ◽  
Resonant Converter ◽  
Pwm Converter ◽  
Input Side ◽  
Output Side ◽  
Zero Voltage ◽  
Current Ripple

A soft switching current-source resonant converter is presented and implemented for wide voltage applications such as fuel cells and solar power. An LLC (inductor–inductor–capacitor) converter is adopted to accomplish zero voltage (current) operation on active switches (diodes). Thus, the circuit efficiency is increased. The interleaved pulse-width modulation (PWM) converter is employed on the input side to accomplish low input ripple current. A hybrid LLC converter is adopted to achieve wide voltage operation from Vin, min to 4Vin, min and to improve the weakness of a conventional LLC converter. Half-bridge diode rectification is employed on the output side to decrease power loss on the rectifier diode. To confirm the theoretical analysis and feasibility, experimental verifications with a 500-W prototype are demonstrated in this paper.

scholarly journals Hybrid DC Converter with Current Sharing and Low Freewheeling Current Loss

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6631
Author(s):  
Bor-Ren Lin ◽  
Guan-Yi Wu
Keyword(s):  
Phase Shift ◽  
Pulse Width Modulation ◽  
Low Voltage ◽  
Magnetic Coupling ◽  
Soft Switching ◽  
Load Range ◽  
Pwm Converter ◽  
Current Loss ◽  
Zero Voltage Switching ◽  
Voltage Balance

A new hybrid high-frequency link pulse-width modulation (PWM) converter using voltage balance capacitor and current balance magnetic coupling is proposed to realize low freewheeling current loss and wide load range of soft switching operation. Series-connected H-bridge converter is adopted for high voltage applications. In addition, a voltage balance capacitor and a current balance magnetic coupling core are employed for achieving voltage and current balance. To extend zero-voltage switching (ZVS) range of switches at lagging-leg of phase-shift PWM converter, soft switching LLC converter is linked to the lagging-leg of phase-shift PWM converter. Therefore, the wide ZVS load operation is realized in the presented hybrid converter. The other high freewheeling current disadvantage in conventional phase-shift PWM converter is improved by a snubber circuit used on low-voltage side. Thus, the primary current during the freewheeling state is decreased and close to zero. In addition, the conduction losses on primary-side components of studied converter are reduced. The secondary-sides of phase-shift PWM converter and LLC resonant converter are series-connected to achieve power transfer between input and output sides. Experimental results using a laboratory prototype are provided to demonstrate the effectiveness of the studied circuit and control algorithm.

scholarly journals A Control Strategy for Bidirectional Isolated 3-Phase Current-Fed Dual Active Bridge Converter

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 214 ◽  
Author(s):  
Dong-Min Lee ◽  
Seung-Wook Hyun ◽  
Jin-Wook Kang ◽  
Yong-Su Noh ◽  
Chung-Yuen Won
Keyword(s):  
Pulse Width Modulation ◽  
Soft Switching ◽  
Zero Voltage Switching ◽  
Phase Current ◽  
Dual Active Bridge ◽  
Circulating Current ◽  
Operation Techniques ◽  
Simulation And Experiment ◽  
Output Capacitor ◽  
Zero Voltage

This paper examines the characteristics of the zero voltage switching (ZVS) and zero voltage transition (ZVT) soft-switching applied in the 3-phase current fed dual active bridge (3P-CFDAB) converter, which combines the advantages of the dual active bridge (DAB) converter and current-fed full bridge (CFFB) converter. When an active clamp circuit is added to the CFFB converter, the circuit configuration of the DAB converter is shown in part of the entire circuit. This allows the use of pulse width modulation (PWM) techniques which combine the PWM techniques of both the DAB converter and CFFB converter. The proposed converter performs both duty and phase control at the same time in order to reduce the circulating current and ripple current of the output capacitor, which are the disadvantages of the CFFB converter and DAB converter. In addition, the ZVS and ZVT soft switching areas were analyzed by means of the phase current and leakage inductor current in each transformers. To verify the principle and feasibility of the proposed operation techniques, a simulation and experiment were implemented with the 3P-CFDAB.

Analysis of a Novel Isolated Input-Series and Output-Series Full-Bridge Bidirectional DC/DC Converter

2013 ◽  
Vol 273 ◽  
pp. 399-403
Author(s):  
Xiao Yu Zhao ◽  
Cong Wang ◽  
Feng Yang ◽  
Su Ke Wang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Power Conversion ◽  
Input Voltage ◽  
Soft Switching ◽  
High Power Density ◽  
High Input ◽  
Working Principle ◽  
High Output Voltage ◽  
High Output

A novel topology of isolated input-series and output-series (ISOS) full-bridge bidirectional DC/DC converter is described in this paper for the application requirement of high input voltage and high output voltage, which can be used in the next generation medium and high voltage power conversion systems. The proposed novel isolated bidirectional DC/DC converter not only can apparently decrease the stress of the switches, but also have the advantages, such as galvanic isolation, ease of realizing soft-switching control, high power density, and so on. In this paper, working principle of the proposed DC/DC converter is discussed in detail, the corresponding equations are derived, and the soft switching implementation is discussed too. In the end, simulation is done through PSIM to certify the feasibility of the proposed DC/DC converter and accuracy of the criterion.

scholarly journals A Wide Input Voltage And Output Load Range LLC Resonant Converter with Two Resonant Tanks

2010 ◽  
Vol 15 (6) ◽  
pp. 466-476 ◽  
Author(s):  
Kwang-Ho Yoon ◽  
Bong-Gun Chung ◽  
Sang-Ho Jang ◽  
Seung-Min Lee ◽  
Eun-Soo Kim
Keyword(s):  
Input Voltage ◽  
Resonant Converter ◽  
Load Range ◽  
Llc Resonant Converter ◽  
Output Load

scholarly journals Soft-Switching High Gain Step-Up DC/DC Converter without Auxiliary Switches

2019 ◽  
Vol 8 (12S) ◽  
pp. 633-636
Keyword(s):  
Theoretical Analysis ◽  
Power Flow ◽  
High Efficiency ◽  
Input Voltage ◽  
High Gain ◽  
Soft Switching ◽  
Zero Voltage Switching ◽  
Auxiliary Cell ◽  
Zero Voltage ◽  
Voltage Switching

This manuscript presents a novel high gain, high efficiency Soft-switching high step-up DC/DC converter for battery-operated vehicles. The high step-up converter can transfer the power flow from the small voltage to high voltage. The conventional two input inductor hard switched non-isolated DC-DC converter improved with an additional auxiliary cell to attain the Zero voltage switching, due to obtaining the softswitching the efficiency may improve and reduces the stress across the main switches. The isolated converters are used as a transformer to attain high gain, whereas in the proposed converter obtains the high gain without a transformer and contains the high efficiency in the step-up mode of operation. The main aim of the converter is to attain the Zero voltage switching without using any additional auxiliary switches. In this paper, the input voltage applied as 30V, and the obtained output voltage is fifteen times to the applied voltage, which is 450V and the output power 850W. This paper mainly presents the theoretical analysis of converter operation and the evaluation of the simulation results validated with the theoretical analysis.

Series-Loaded Resonant Converter DC-DC Buck Operating for Low Power

2017 ◽  
Vol 8 (1) ◽  
pp. 159
Author(s):  
M. F. Omar ◽  
H. C. M. Haris
Keyword(s):  
Low Power ◽  
High Frequency ◽  
Buck Converter ◽  
Soft Switching ◽  
Switching Topology ◽  
Resonant Converter ◽  
Zero Voltage Switching ◽  
Bridge Rectifier ◽  
Zero Voltage ◽  
Voltage Switching

This paper presents the functions of Series-Loaded Resonant Converter (SLRC). Series Loaded Resonant DC-DC converter is a type of soft-switching topology widely known for providing improved efficiency. Zero voltage switching (ZVS) buck converter is more preferable over hard switched buck converter for low power, high frequency DC-DC conversion applications. Zero Voltage switching techniques will be used to improve the efficiency of current and voltage at the series loaded half-bridge rectifier. The results will be described from PSIM simulation, Programming of MATLAB calculation and hardware testing.

SOFT-SWITCHING PWM CONVERTER TECHNOLOGIES

1995 ◽  
Vol 05 (04) ◽  
pp. 531-558 ◽  
Author(s):  
GUICHAO HUA ◽  
FRED C. LEE
Keyword(s):  
Power Conversion ◽  
Soft Switching ◽  
Resonant Converters ◽  
Pwm Converter ◽  
Square Wave ◽  
Pwm Converters ◽  
Zero Current ◽  
Current Transition ◽  
Conversion Technologies ◽  
Zero Voltage

The switched-mode power conversion technologies have evolved from the basic PWM converters to resonant converters, quasi-resonant converters, multi-resonant converters, and most recently, to soft-switching PWM converters. In this paper, several typical resonant techniques and several soft-switching PWM techniques are reviewed, and their merits and limitations are assessed. The resonant techniques reviewed include the quasi-resonant converters, multi-resonant converters, Class-E converters, and resonant dc link converters; and the soft-switching PWM techniques reviewed include the zero-voltage-switched (ZVS) quasi-square-wave converters, ZVS-PWM converters, zero-current-switched PWM converters, zero-voltage- transition PWM converters, and zero-current-transition PWM converters.

Design and Implementation of LLC Resonant Converter for Photovoltaic Battery Charging Application

2015 ◽  
Vol 785 ◽  
pp. 101-105
Author(s):  
Adrian Soon Theam Tan ◽  
Shahid Iqbal
Keyword(s):  
High Efficiency ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Photovoltaic System ◽  
Resonant Converter ◽  
Battery Charging ◽  
Zero Voltage Switching ◽  
Design And Implementation ◽  
Switching Losses ◽  
Llc Resonant Converter

Photovoltaic power conditioning system (PVPCS) requires a high efficiency dc-dc converterstage capable of wide input voltage regulation and have the ease of maximum power point implementation for both stand alone photovoltaic system and grid-connected system. Galvanic isolation at the dc-dc stage can replace the isolation needed in the inverter stage and thus reduce the sizeof isolation transformer and increases overall system efficiency. This paper presents detailed analysis,design and implementation of a LLC resonant converter for photovoltaic battery charging application.The LLC resonant converter operate with zero voltage switching (ZVS) turn on and low current turnoff thus reducing switching losses. The experimental results are given to validate the operation andperformance of the converter.

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