Modified LLC Resonant Converter with LC Anti-resonant Circuit in Parallel Branch for Wide Voltage Range Application

2021 ◽  
pp. 1-1
Author(s):  
Xiqi Wu ◽  
Rui Li ◽  
Xu Cai
Keyword(s):  
Resonant Circuit ◽  
Resonant Converter ◽  
Voltage Range ◽  
Llc Resonant Converter

scholarly journals Wide Voltage Resonant Converter Using a Variable Winding Turns Ratio

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 370 ◽  
Author(s):  
Bor-Ren Lin ◽  
Chu-Xian Dai
Keyword(s):  
Low Voltage ◽  
Field Effect Transistors ◽  
Oxide Semiconductor ◽  
Resonant Circuit ◽  
Frequency Variation ◽  
Switching Frequency ◽  
Voltage Gain ◽  
Resonant Converter ◽  
Voltage Range ◽  
Llc Resonant Converter

This paper presents a inductor–inductor–capacitor (LLC) resonant converter with variable winding turns to achieve wide voltage operation (100–400 V) and realize soft switching operation over the entire load range. Resonant converters have been developed for consumer power units in computers, power servers, medical equipment, and adaptors due to the advantages of less switching loss and better circuit efficiency. The main disadvantages of the LLC resonant converter are narrow voltage range operation owing to wide switching frequency variation and limited voltage gain. For computer power supplies with hold-up time function, electric vehicle battery chargers, and for power conversion in solar panels, wide input voltage or wide output voltage operation capability is normally demanded for powered electronics. To meet these requirements, the variable winding turns are used in the presented circuit to achieve high- or low-voltage gain when Vin is at low- or high-voltage, respectively. Therefore, the wide voltage operation capability can be implemented in the presented resonant circuit. The variable winding turns are controlled by an alternating current (AC) power switch with two back-to-back metal-oxide-semiconductor field-effect transistors (MOSFETs). A 500-W prototype is implemented and test results are presented to confirm the converter performance.

scholarly journals A Novel Dual Integrated LLC Resonant Converter Using Various Switching Patterns for a Wide Output Voltage Range Battery Charger

Electronics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 759
Author(s):  
Bong-Yeon Choi ◽  
Soon-Ryung Lee ◽  
Jin-Wook Kang ◽  
Won-Sang Jeong ◽  
Chung-Yuen Won
Keyword(s):  
Output Voltage ◽  
Voltage Gain ◽  
Resonant Converter ◽  
Operating Characteristics ◽  
Battery Charger ◽  
Voltage Range ◽  
Switching Pattern ◽  
Operating Frequency Range ◽  
Switching Patterns ◽  
Llc Resonant Converter

This paper proposes a novel dual integrated LLC resonant converter (DI-LRC) with a wide output voltage range using various switching patterns. The primary side of the proposed DI-LLC converter consists of two resonant tanks and six switches, while the secondary side consists of a six-pulse diode rectifier. Depending on the switching pattern of the primary switch, the DI-LRC converter is performed by single full-bridge operation with a voltage gain of 1, series-connected full-bridge operation with a voltage gain of 0.5, series-connected half bridge operation with a voltage gain of 0.25, and parallel-connected full-bridge operation with a voltage gain of 2. Accordingly, the proposed DI-LRC converter has four voltage gain curves with different variations and achieves a wider output voltage range than the conventional single voltage gain curve in a given operating frequency range. In this paper, the equivalent circuits derived for each switching pattern are proposed to analyze the operating characteristics of the proposed converter according to each switching pattern, and each Q factor and voltage gain are calculated based on the analyzed equivalent circuit. The performance of the proposed converter and switching pattern is verified using the simulation and experimental results of the prototype battery charger, which is designed to be 4-kW class.

scholarly journals Bidirectional Interface Resonant Converter for Wide Voltage Range Storage Applications

2021 ◽  
Vol 14 (1) ◽  
pp. 377
Author(s):  
Mouncif Arazi ◽  
Alireza Payman ◽  
Mamadou Baïlo Camara ◽  
Brayima Dakyo
Keyword(s):  
Electromagnetic Compatibility ◽  
Narrow Range ◽  
Harmonic Approximation ◽  
Design Procedure ◽  
Resonant Circuit ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Voltage Range ◽  
Wide Range ◽  
Storage Units

In this paper, a bidirectional zero voltage switching (ZVS) resonant converter with narrow control frequency deviation is proposed. Wide input–output voltage range applications, such as flywheel or supercapacitors storage units are targeted. Due to symmetrical topology of resonant circuit interfaces, the proposed converter has similar behavior in bidirectional operating mode. We call it Dual Active Bridge Converter (DABC). The proposal topology of the converter is subjected to multi resonant circuits which make it necessary to study with multiscale approaches. Thus, first harmonic approximation and use of selective per unit parameters are established in (2) Methods. Then, the forward direction and backward direction of power flux exchange are detailed according to switching sequences. Switching frequency control must be completed within a narrow range. So, the frequency range deterministic parameters are emphasized in the design procedure in (3) Methods. A narrow range of switching frequency and a wide range voltage control must be ensured to suit for energy storage units, power electronic devices capabilities and electromagnetic compatibility. A 3 kW test bench is used to validate operation principles and to proof success of the developed design procedure. The interest of proposed converter is compared to other solutions from the literature in (4) Results.

scholarly journals Bidirectional Resonant Converter for DC Microgrid Applications

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1664
Author(s):  
Bor-Ren Lin
Keyword(s):  
Electric Vehicle ◽  
Output Voltage ◽  
Resonant Circuit ◽  
Resonant Converter ◽  
Battery Charger ◽  
Dc Microgrid ◽  
Voltage Range ◽  
Zero Voltage Switching ◽  
Active Devices ◽  
Power Operation

A bidirectional resonant converter is presented and verified in this paper for an electric vehicle battery charger/discharger system. The presented circuit can achieve forward and backward power operation, low switching losses on active devices, and wide output voltage operation. The circuit structure of the presented converter includes two resonant circuits on the primary and secondary sides of an isolated transformer. The frequency modulation approach is adopted to control the studied circuit. Owing to the resonant circuit characteristic, active devices for both forward (battery charge) and backward (battery discharge) power operation can be turned on at zero voltage switching. In order to implement a universal battery charger for different kinds of electric vehicle applications, the DC converter is demanded to have a wide output voltage range capability. The topology morphing between a full bridge resonant circuit and half bridge resonant circuit is selected to obtain high- and low-output voltage range operations so that the 200–500 V output voltage range is realized in the presented resonant converter. Compared to the conventional bidirectional converters, the proposed can be operated under a wide voltage range operation. In the end, a 1 kW laboratory prototype circuit is built, and experiments are provided to demonstrate the validity and performance of the presented bidirectional resonant converter.

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