scholarly journals Interleaved High Step-Up Current Sharing Converter with Coupled Inductors

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 436
Author(s):  
Liangzong He ◽  
Zhile Lin ◽  
Qingyang Tan ◽  
Fengwang Lu ◽  
Tao Zeng
Keyword(s):  
Low Voltage ◽  
Two Phase ◽  
Leakage Inductance ◽  
Coupled Inductors ◽  
The Third ◽  
Current Sharing ◽  
Voltage Output ◽  
Voltage Stress ◽  
Recovery Problem ◽  
Switch Voltage

An interleaved high-step-up current sharing DC–DC converter with coupled inductors is proposed in this paper. The operation principle and property of this converter are analyzed. The ripple of the input current in the proposed converter is decreased significantly by using the two-phase parallel interleaved input. The voltage gain is extended and the switch voltage stress is reduced by the coupled inductors. The leakage inductance of the coupled inductors reduces the reverse-recovery problem of the output diode, resulting in the reduction of reverse-recovery losses. As there are two interleaved phases in the proposed converter, the third winding of each coupled inductor is embedded in another phase. With this design, when the leakage inductance or duty cycle is asymmetrical, the current sharing performance is still positive. Consequently, the new topology is very suitable for applications to occasions with low voltage input and high voltage output, such as the fuel cell power system. Finally, the performance of this topological circuit is verified by a prototype with 500 W output.

scholarly journals A Double-Boost Converter Based on Coupled Inductance and Magnetic Integration

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Hongzhu Li ◽  
Ling Zhu ◽  
Le Wang
Keyword(s):  
Low Voltage ◽  
Boost Converter ◽  
Cell System ◽  
Photovoltaic System ◽  
Switching Frequency ◽  
Voltage Gain ◽  
Leakage Inductance ◽  
Coupled Inductors ◽  
High Voltage Gain ◽  
Voltage Stress

High-voltage gain converter has a high-frequency use in some industrial fields, for instance, the fuel cell system, the photovoltaic system, electric vehicles, and the high-intensity discharge lamp. In order to solve the problem of the low-voltage gain of traditional boost converter, the double-boost converter with coupled inductance and doubled voltage is proposed, which connects the traditional boost converter in parallel. The voltage gain of the converter is further improved by introducing the voltage-doubled unit of the coupled inductance. Moreover, the clamp capacitor can absorb the leakage inductance in the circuit and reduce the voltage stress of the switch. In addition, two coupled inductors are magnetically collected; then, the loss of the core is analyzed under the same gain. The detailed analysis of the proposed converter and a comparison considering other topologies previously published in the literature are also presented in this article. In order to verify the proposed converter performance, a prototype has been built for a power of 200 W, input and output voltages of 12 and 84 V, respectively, and a switching frequency of 50 kHz. Experimental results validate the effectiveness of the theoretical analysis proving the satisfactory converter performance, whose peak efficiency is 95.5%.

scholarly journals Novel High-Efficiency High Step-Up DC–DC Converter with Soft Switching and Low Component Voltage Stress for Photovoltaic System

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1112
Author(s):  
Yu-En Wu ◽  
Jyun-Wei Wang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
High Efficiency ◽  
Low Voltage ◽  
Leakage Inductance ◽  
Power Switch ◽  
Half Wave Voltage ◽  
Half Wave ◽  
Voltage Stress ◽  
Voltage Doubler

This study developed a novel, high-efficiency, high step-up DC–DC converter for photovoltaic (PV) systems. The converter can step-up the low output voltage of PV modules to the voltage level of the inverter and is used to feed into the grid. The converter can achieve a high step-up voltage through its architecture consisting of a three-winding coupled inductor common iron core on the low-voltage side and a half-wave voltage doubler circuit on the high-voltage side. The leakage inductance energy generated by the coupling inductor during the conversion process can be recovered by the capacitor on the low-voltage side to reduce the voltage surge on the power switch, which gives the power switch of the circuit a soft-switching effect. In addition, the half-wave voltage doubler circuit on the high-voltage side can recover the leakage inductance energy of the tertiary side and increase the output voltage. The advantages of the circuit are low loss, high efficiency, high conversion ratio, and low component voltage stress. Finally, a 500-W high step-up converter was experimentally tested to verify the feasibility and practicability of the proposed architecture. The results revealed that the highest efficiency of the circuit is 98%.

Design and Analysis of a High-Efficiency Two-Phase Interleaved Boost Converter with Modified Conversion Ratio and Low Voltage Stress

2021 ◽  
pp. 2150161
Author(s):  
Mriganka Biswas ◽  
Somanath Majhi ◽  
Harshal Nemade
Keyword(s):  
High Efficiency ◽  
Low Voltage ◽  
Load Condition ◽  
Boost Converter ◽  
Conversion Ratio ◽  
Duty Ratio ◽  
Two Phase ◽  
Voltage Stress ◽  
Interleaved Boost Converter ◽  
In Series

The paper presents a two-phase interleaved boost converter (IBC) providing higher step-up conversion ratio compared to the conventional IBC. The circuit consists of a crossly connected diode-capacitor cell which provides the extra boost up. The two identical capacitors of the cell are charged in parallel and discharged in series providing high voltage gain at considerably low duty ratio. Switching operations, ripple and average currents through inductors are analyzed in continuous conduction mode (CCM). Ripple in input current is also improved. The voltage stress across the semiconductor devices is less in the proposed converter. Also, boundary load condition is derived. Small-signal modeling is carried out and a control circuit is enabled in the voltage mode control framework. Power losses are analyzed and 96.53[Formula: see text] efficiency is achieved. Finally, the proposed converter is designed and implemented, and experimental results are provided.

scholarly journals LLC LED Driver with Current-Sharing Capacitor Having Low Voltage Stress

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 112
Author(s):  
Wen-Zhuang Jiang ◽  
Kuo-Ing Hwu ◽  
Jenn-Jong Shieh
Keyword(s):  
Low Voltage ◽  
Light Emitting Diode ◽  
Input Voltage ◽  
Current Control ◽  
Constant Current ◽  
Resistive Load ◽  
Led Driver ◽  
Current Sharing ◽  
Voltage Stress ◽  
The Difference

In this paper, an LLC light-emitting diode (LLC LED) driver based on the current-sharing capacitor is presented. In the proposed LED driver, the LLC resonant converter is used to step down the high input voltage, to provide galvanic isolation, to offer a constant current for LEDs. Moreover, the current-sharing capacitor connected to the central-tapped point of the secondary-side winding is used to balance the currents in two LED strings. By doing so, the voltage stress on this capacitor is quite low. Above all, the equivalent forward voltages of the two LED strings are generally influenced by the temperature and the LED current, and this does not affect the current-sharing performance, as will be demonstrated by experiment on the difference in number of LEDs between the two LED strings. In addition, only the current in one LED string is sensed and controlled by negative feedback control, while the current in the other LED string is determined by the current-sharing capacitor. Moreover, this makes the current control so easy. Afterwards, the basic operating principles and analyses are given, particularly for how to derive the effective resistive load from the LED string. Eventually, some experimental results are provided to validate the effectiveness of the proposed LED driver.

Isolated High Step-Up DC-DC Converter with Zero-Voltage-Switching

2013 ◽  
Vol 313-314 ◽  
pp. 333-336
Author(s):  
Hyun Lark Do
Keyword(s):  
Output Voltage ◽  
Voltage Gain ◽  
Leakage Inductance ◽  
Zero Voltage Switching ◽  
Voltage Doubler ◽  
Total Leakage ◽  
Zero Voltage ◽  
Recovery Problem ◽  
Switch Voltage ◽  
Voltage Switching

A high step-up DC-DCconverter is proposed in this paper. The proposed converter has two transformers.The primary sides of them are paralleled virtually and the secondary sides haveseries connection to increase the voltage gain. An active clamp circuit isemployed to suppress the switch voltage stresses and obtainzero-voltage-switching (ZVS) operation of the switches. Voltage doubler isselected as an output rectifier to increase the voltage gain and confine thevoltage across the output diodes to the output voltage. Since the output diodecurrents are controlled by the total leakage inductance of the transformers,the reverse-recovery problem of the output diodes is significantly alleviated.Due to the ZVS operation and the alleviated reverse-recovery problem, theswitching losses of the proposed converter are significantly reduced and theefficiency is improved. Steady-state analysis is performed. Experimentalresults based on a prototype are also provided to verify the effectiveness andfeasibility of the proposed converter.

scholarly journals Improvement in Voltage Conversion Ratio of Ultrahigh Step-Down Converter

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3896
Author(s):  
Kuo-Ing Hwu ◽  
Wen-Zhuang Jiang ◽  
Hsiang-Hao Tu
Keyword(s):  
Input Voltage ◽  
Conversion Ratio ◽  
Leakage Inductance ◽  
Zero Voltage Switching ◽  
Voltage Stress ◽  
Basic Operating ◽  
Step Down ◽  
Voltage Conversion ◽  
Zero Voltage ◽  
Switch Voltage

A modified step-down converter is presented herein, which is mainly based on one coupled inductor and several energy-transferring capacitors to improve the voltage conversion ratio as well as to reduce the switch voltage stress. In addition, the portion of the leakage inductance energy can be recycled to the input via the active clamp circuit during the turn-off period and the switches have zero-voltage switching (ZVS) during the turn-on transient. In this paper, the basic operating principles of the proposed converter are firstly described and analyzed, and its effectiveness is finally demonstrated by experiment based on a prototype with input voltage of 60 V, output voltage of 3.3 V and rated output power of 33 W.

High Step-Up Interleaved ZVT Converter With Low Voltage Stress and Automatic Current Sharing

2018 ◽  
Vol 65 (1) ◽  
pp. 291-299 ◽  
Author(s):  
Baharak Akhlaghi ◽  
Navid Molavi ◽  
Mahmoud Fekri ◽  
Hosein Farzanehfard
Keyword(s):  
Low Voltage ◽  
Current Sharing ◽  
Voltage Stress
Sign in / Sign up

Export Citation Format

Share Document