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Battery aging coupled with additional loads placed on the power system of the Mola Mola AUV required that the original battery pack be replaced with a higher capacity system. A set of requirements were assembled to ensure the new pack would be electrically compatible, safe, and of appropriate configuration for AUV use. Pressure tolerant SeaSafe lithium ion modules, produced by the Southwest Electronic...
We constructed a charge and discharge system for effective utilization of an electric storage device composed of batteries. We verified the system operation by simulation analysis and actual measurement. The simulation analysis showed that it is useful to alternately use two secondary batteries as the lithium ion battery (LIB). From the measurement of 60 cycles, the use of secondary batteries under...
Reduction in overall system size gives rise to on chip integration of buck converter with other system devices. Integration of Power MOSFET and CMOS circuits onto a single chip yield high cost and complex technology. This paper proposes an alternative method to design voltage down converter using low power 0.13μm CMOS devices. The monolithic converter is a Continuous Conduction Mode (CCM) buck converter...
This paper presents a review on the charging techniques of the batteries, particularly the lithium polymer ‘LiFePO4’. The lithium polymer entrusts some characteristics, which select it over the other types of batteries in usage. Basically, there exists one charging technique that is commonly used in the industries nowadays and it is known by constant-current constant-voltage technique (CC-CV). Nevertheless,...
Bidirectional multi-port converters are particularly suitable for voltage balancing controllers of automotive lithium ion batteries. The converter topology proposed in this paper achieves a small number of components, high efficiency and low EMI due to the zero voltage switching. In comparison to other applications with multi-port converters the voltage balancing controller application requires a...
This paper presents an improved method of modelling the hysteresis effect in batteries using the discrete preisach model. The hysteresis effect can be seen as a path-dependent effect or history-dependent effect on the lithium ion battery. This effect complicates the relationship between State of Charge (SOC) and Open Circuit Voltage (OCV) as it is no longer simply a one to one relationship, but rather...
In the switching process of microgrid from the state of being intergrated in external grid to the state of island operation, many devices such as energy storage devices, after sudden disturbance changes its running state, in some extreme cases, this change will overcome the device's affordability, requires the using of relay protection device to avoid further damage. The platform of the microgrid...
In this paper electro-chemical energy storing is discussed. Based on problems of currently available storage systems, the idea of using multilevel converters with distributed energy storages is introduced. Here, the Modular Multilevel Converter is focused after a general comparison with other multilevel converter concepts. To get familiar with this converter concept its characteristics and especially...
This paper proposed lithium-ion based high-voltage battery simulator. Matlab based battery parameters and modeling were implemented, and the characteristics of the modeled batteries were output by using three-phase grid-connected AC / DC PWM converters. The proposed methods were verified by PSIM.
This paper develops a fast response, bidirectional, and single-phase isolated AC-DC converter for testing the battery of electric scooter. The converter which is based on fast current control can simulate the on-road power flow by controlling the current of battery in laboratory. The current command is recorded from the battery in electrical scooter when is running on road. The proposed converter...
A new cell voltage equalizer topology for future plug-in hybrid electric vehicles (PHEV) or renewable energy storage has been proposed in this paper. This topology has fewer components compared to the conventional topologies found in the literatures, and therefore, it could reduce cost and fabrication complexity. This new circuit is based on a time shared fly-back converter, and any number of series...
This paper presents a cell balancing management for battery pack. It is used for each cell in battery pack to protect pack from damages such as overheating and overvoltage taken by the different performances between different cells, it manages individual cell with CC-CV charging strategy, shunts charge current smoothly to protect every cell preferably; in order to be suitable for different charge...
The integration of photovoltaic (PV) generators in the gird is still an ongoing topic. The peak efficiency of today's power electronics is already above 98%, therefore innovative aspects can grow from new ways of grid integration. This paper focuses on the combination of a 5 kW PV-generator with a li-ion battery. The temporal decoupling of the generation and injection of energy into the European low...
A single-inductor dual-input dual-output (SIDIDO) buck regulator is presented for simultaneously regulating a battery charging current and a output DC voltage in portable battery management system. The proposed SIDIDO converter operates in the continuous-conduction mode for relaxing the peak current stress and thus enables the converter to deliver a maximum load power of 2.2 W. Moreover, the cross...
In this paper, a cell balancing circuit for the Lithium-ion battery string based on the Flyback topology is proposed. The proposed circuit draws the charge out of the high voltage cell and recovers it to the overall battery pack. With the selectivity of the target cell, the proposed circuit uses the minimized power path to simplify the circuit and optimize the balancing efficiency. The circuit also...
In this paper, a main circuit, a buck converter, together with an auxiliary circuit, bidirectional buck converter, is used to charge two Li batteries connected in series. By doing so, such an auxiliary circuit takes two roles in executing equalization between the two Li batteries. One role, together with the main circuit, to charge the second battery whose low-level terminal is connected to the ground...
This paper describes the design and operation of a 6-kW, full-bridge, zero-voltage switching, bidirectional isolated dc-dc converter for a 2-kWh lithium-ion (Li-ion) bank that is considered attractive as an energy storage system for applications to photovoltaic generation systems ranging from 10 to 30 kW. The dc voltage at the high-voltage side of the converter is controlled from 305 to 355 V as the...
This paper presents a lithium-ion battery recharging circuit with an improved charger system topology for portable devices and handheld gadgets. The proposed charger topology uses an operational amplifier with NMOS input for a smooth transition between current control loop and voltage control loop and to control a power pass element device. Using the above-mentioned abilities, a complete charging...
The article deals with a design of control and power electronics for rechargeable newest type of rechargeable batteries LiFePo4. The first part is devoted to a description of batteries, their advantages and disadvantages. The second part deals with control of the switching of individual accumulators. In the last third part is the design of charging power module.
This paper proposed a high-efficiency battery charging and discharging system for high-capacity single-body Li-ion battery. This system can work as battery formation system or battery test system. The main system structure includes a single-phase bi-directional PWM rectifier, dc-link, half-bridge converter with current-doubler synchronous rectifier as charging unit and interleaved pull-push converter...
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