Feed-Forward Control of Input-Series and Output-Parallel DC Transformer

2013 ◽  
Vol 341-342 ◽  
pp. 791-796
Author(s):  
Xian Jin Zhang ◽  
Bu Gen Wang
Keyword(s):  
Control Method ◽  
Input Voltage ◽  
Duty Ratio ◽  
Feed Forward ◽  
Zero Voltage Switching ◽  
Feed Forward Control ◽  
Good Ability ◽  
Dc Transformer ◽  
Output Filter ◽  
Zero Voltage

The input-series and output-parallel (ISOP) DC transformer, which has no output filter, runs under near 100% duty ratio, and is easily achieve zero voltage switching (ZVS) conditions and higher efficiency, is more and more attractive in the high input voltage and high power applications. In order to achieving input voltages sharing in ISOP DC transformer based on two non-resonant DC transformer modules, the feed-forward control method is proposed in this paper. And the principle of the proposed control is analyzed in detail. Finally, experimental results are given to verify the proposed control method to have a good ability of sharing the input voltages.

scholarly journals Design and Implementation of 2.5kW IBFB-LLC DC/ DC Converter Using SiC Mosfet

2021 ◽  
Vol 31.2 (149) ◽  
pp. 7-14
Keyword(s):  
High Frequency ◽  
Power Flow ◽  
Input Voltage ◽  
Voltage Range ◽  
Zero Voltage Switching ◽  
Design And Implementation ◽  
Switching Losses ◽  
Power Switches ◽  
Isolation Transformer ◽  
Zero Voltage

Interleaved Boost Full Bridge integrated LLC resonant (IBFB- LLC) is an isolated DC/DC converter with directional power flow, which can cope with a wide input voltage range of PV applications. The main losses of the converter are switching losses of the power switches and transformers losses. This paper proposes a method to improve the efficiency of the IBFB converter due to zero voltage switching technique, in combination with employing new SiC MOSFET technology instead of the conventional Si MOSFET. In addition, Litz wire is also adopted to reduce the losses on the high frequency isolation transformer. Both numerical simulations and experiments with a prototype 2.5kW converter are implemented to verify the feasibility and effectiveness of the proposed solution.

scholarly journals Hybrid LLC Converter with Wide Range of Zero-Voltage Switching and Wide Input Voltage Operation

2020 ◽  
Vol 10 (22) ◽  
pp. 8250
Author(s):  
Bor-Ren Lin ◽  
Kun-Yi Chen
Keyword(s):  
Low Voltage ◽  
Input Voltage ◽  
Resonant Circuit ◽  
Zero Voltage Switching ◽  
Photovoltaic Energy Conversion ◽  
Wide Range ◽  
Input Side ◽  
Input Region ◽  
Output Side ◽  
Zero Voltage

A new hybrid inductor-inductor-capacitor (LLC) converter is investigated to have wide voltage input operation capability and zero-voltage turn-on characteristics. The presented circuit topology can be applied for consumer power units without power factor correction or with long hold-up time requirement, photovoltaic energy conversion and renewable energy power transfer. To overcome the weakness of narrow voltage gain of resonant converter, the hybrid LLC converter with different turns ratio of transformer is presented and the experimental investigation is provided to achieve wide voltage input capability (400 V–50 V). On the input-side, the converter can operate as full bridge resonant circuit or half bridge resonant circuit with input split capacitors for high or low voltage input region. On the output-side, the less or more winding turns is selected to overcome wide voltage input operation. According to the circuit structures and transformer turns ratio, the single stage LLC converter with wide voltage input operation capability (400 V–50 V) is accomplished. The laboratory prototype has been developed and the experimental waveforms are measured and demonstrated to investigate the effectiveness of the presented hybrid LLC converter.

scholarly journals Implementation of a Wide Input Voltage Resonant Converter with Voltage Doubler Rectifier Topology

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1931
Author(s):  
Bor-Ren Lin ◽  
Yen-Chun Liu
Keyword(s):  
Input Voltage ◽  
Resonant Circuit ◽  
Circuit Performance ◽  
Voltage Range ◽  
Zero Voltage Switching ◽  
Renewable Power ◽  
Battery Chargers ◽  
Variable Voltage ◽  
Voltage Doubler ◽  
Zero Voltage

A new circuit structure of LLC converter is studied and implemented to achieve wide zero-voltage switching range and wide voltage operation such as consumer power units without power factor correction and long hold up time demand, battery chargers, photovoltaic converters and renewable power electronic converters. The dc converter with the different secondary winding turns is adopted and investigated to achieve the wide input voltage operation (50–400 V). To meet wide voltage operation, the full bridge and half bridge dc/dc converters with different secondary turns can be selected in the presented circuit to have three different voltage gains. According to input voltage range, the variable frequency scheme is employed to have the variable voltage gain to overcome the wide input voltage operation. Therefore, the wide soft switching load variation and wide voltage operation range are achieved in the presented resonant circuit. The prototype circuit is built and tested and the experiments are demonstrated to investigate the circuit performance.

Analysis and Implementation of a Zero-Voltage-Switching Zeta Converter

2012 ◽  
Vol 424-425 ◽  
pp. 1199-1202
Author(s):  
Hyun Lark Do
Keyword(s):  
Switching Loss ◽  
Zero Voltage Switching ◽  
Experimental Prototype ◽  
Active Switch ◽  
And Performance ◽  
Output Filter ◽  
Zero Voltage ◽  
Voltage Switching

A zero-voltage-switching (ZVS) Zeta converter is proposed in this paper. Two separate inductors in the conventional Zeta converter are magnetically coupled in the proposed converter. The output diode is replaced with an active switch. Also, an auxiliary inductor is utilized. The ZVS operation of both main and auxiliary switches is achieved and the switching loss is significantly reduced. Moreover, the ripple component of the output inductor current is effectively removed and the output filter stage can be simplified. To verify the feasibility and performance of the proposed converter, an experimental prototype was built and tested.

QPR and duty ratio feed-forward control for vienna rectifier of HVDC supply system

2017 ◽  
Vol 12 (4) ◽  
pp. 501-509 ◽  
Author(s):  
Chaoliang Dang ◽  
Xiangqian Tong ◽  
Jingjing Huang ◽  
Qian Wang ◽  
Hao Zhang
Keyword(s):  
Supply System ◽  
Duty Ratio ◽  
Feed Forward ◽  
Feed Forward Control ◽  
Vienna Rectifier

Research on the Half-Bridge Three-Level DC/DC Converter with High Frequency and High Voltage

2013 ◽  
Vol 732-733 ◽  
pp. 1175-1178
Author(s):  
Hong Zhang ◽  
Gui Xin Wang ◽  
Hao Yan ◽  
Lu Zhou Zhang
Keyword(s):  
High Voltage ◽  
Input Voltage ◽  
Zero Voltage Switching ◽  
High Voltage Direct Current ◽  
Parameters Selection ◽  
Converter Topology ◽  
Working Principle ◽  
Current Zero ◽  
Zero Voltage ◽  
Voltage Switching

In this research, a high-voltage direct current zero voltage switching (ZVS) PWM half-bridge converter is proposed. The parameters of the converter as follows: the input voltage is up to 4000V;the output voltage is 600V.The new ZVS PWM TL converter has neutral point clamping diodes and flying capacitor. This research is going to analyze the working principle of circuit witch thus realizing the zero voltage switching and the circuit parameters selection. Moreover, circuits simulation is carried out by MATLAB to verify the reliability and feasibility of this DC/DC converter topology.

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