scholarly journals Implementation of a Smart Battery Charger Using LLC Resonant Converter

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
E.U. Nwosu
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Resonant Converter ◽  
Battery Charger ◽  
Battery Charging ◽  
Operational Conditions ◽  
Display Unit ◽  
Llc Resonant Converter ◽  
Terminal Voltage ◽  
Load Conditions

This research was influenced by the need to eradicate voltage selection error in manual battery-charging, as well as the necessity for getting more batteries charged within a short duration without compromising the cycle life of a battery. Minimizing human interference in charging of batteries as a means of making the process stress-free, safer and faster is also a motivation for this work. This paper presents a battery charger which takes accurate decisions by itself and eliminates poor charging parameters which can damage even brand new batteries. The battery charging unit automatically senses the battery terminal voltage(s), supplies appropriate charging voltage/current, and terminates charging process based on preset operational conditions of voltage, current and temperature. Key components of the developed prototype include PIC16F877A microcontroller chip, LLC resonant converter, and an LCD based display unit. The chip runs dedicated codes that control all tasks involved in the operation of the charger. Pulse-width modulation (PWM) technique was employed to control switching duty cycle which consequently varies the output of the converter and enables battery-charging from 6-volt to 48-volt. Before embarking on the actual constructions, simulations were done to evaluate the performance of the system. The model was subjected to tests under various load conditions and the results agreed with objectives of the research.

Design of Portable On-Board Charger

2012 ◽  
Vol 229-231 ◽  
pp. 837-840
Author(s):  
Deng Liang Cheng ◽  
Wei Rong Jiang ◽  
Jian Wei Mei
Keyword(s):  
Pulse Width ◽  
Parallel Machines ◽  
Pulse Width Modulation ◽  
Control Mode ◽  
Constant Current ◽  
System Control ◽  
Single Chip ◽  
Battery Charging ◽  
Loop Control ◽  
Bus Voltage

To solve the key technology of automotive lithium battery charging system, a new kind of smart portable on-board charger is developed. This battery charger takes single-chip machine of freescale as system control chip, realizes closed-loop control of bus voltage by the voltage pulse width modulation chip TL494, realizes charger output with constant voltage, constant current and switch without disturbances by the current pulse width modulation chip UC3846, achieves master-slave control mode for multi–parallel machines through the CAN bus technology. In addition, the microcontroller program realizes the process monitoring and fuzzy PID regulation, the charging process has multiple intelligent protection and external regulatory functions. The experimental results show that with dual regulations of the software and hardware, the charger has the advantages of stable reliability, flexible operation and precise intelligence, an effective exploration of the battery charging technology is carried out.

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 Multioutput Flyback DC-DC Converter for MIL Applications

2021 ◽  
Author(s):  
Sukumar Patil ◽  
Bhanuprakash CV ◽  
Bhoopendrakumar Singh
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Short Circuit ◽  
Current Mode ◽  
Switching Frequency ◽  
Current Output ◽  
Military Applications ◽  
Input Range ◽  
Emi Filter ◽  
Load Conditions

Abstract This paperwork explains the design and development of isolated triple output dc-dc converter for military applications. Converter has designed with flyback topology with opto-coupler based feedback for regulated main output and regulators are used to provide another two outputs. It is realized with switching frequency of 190KHz (internal free run frequency) and can be able to operate up to 210KHz with external synchronization. LTM46xx micro-modules are used as buck regulators to provide required lower output voltages. Current mode pulse width modulation controller IC is used to drive the MOSFET switch. It has following features like inbuilt EMI filter, external inhibit function, external synchronization capability, input under voltage and over voltage protection, primary side over current, output over current and short circuit protection. Converter is designed to operate for wide input range from 18V to 36V with efficiency of more than 75% in full load conditions.

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