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Multi-port DC/DC converters have been widely employed in stand-alone renewable power systems to provide stable and continuous power to the electrical loads. A full-bridge three-port converter (FB-TPC) interfacing a renewable source, a storage battery, and a load is proposed. The proposed FB-TPC integrates two Buck-boost converters into the primary side of the full-bridge topology, and the magnetizing...
A new bi-directional DC-DC converter is designed and analyzed in this paper. This new topology and its control strategy have completely solved voltage spike issues present in traditional bi-directional DC-DC converters which also have limited power capability and efficiency. This converter can serve as battery bank and DC-bus interface and work in both directions (charging-battery direction and supporting-bus...
In solar array-battery power system of satellites, new topology and control strategy have been studied to decrease the volume and weight. In this paper, a multi-port converter with the multimode control is introduced. The control strategy for the module is proposed, which contains domain control and dual-frequency PWM control, i.e. multi-mode control strategy. It is demonstrated that dual-frequency...
A high frequency, high efficiency bi-directional battery charger for Plug-in Hybrid Electric Vehicle (PHEV) is built with high voltage normally-off GaN-on-Si HFETs. The battery charger topology consists of a 500 kHz Full Bridge (FB) AD/DC stage and a 500 kHz Dual Active Bridge (DAB) DC/DC stage. The system functionality is verified and measured efficiency is 97% for the AC/DC stage and 97.2% for the...
The constant power behavior of tight-speed controllers in the vehicle's traction system and tightly regulated DC-DC converters connected to the HV-DC bus produces instability effects. This paper proposes a simple and practical non-linear control, using Circular Switching Surfaces, to address constant power load instability in electric vehicle's power systems. The proposed control technique provides...
This paper proposes the simple and seamless operation technique for bi-directional LLC converter. Generally, bi-directional operation of LLC converter is complicated and difficult to control. Because, the switching frequency has to be changed across fsr (series resonant frequency) and the switching sequences has to be also changed due to resonant characteristics. In order to simplify the switching...
This paper proposes a DC-DC converter that can be used in battery equalization and charging and discharging applications. The proposed topology is a high frequency (≥ 5 MHz) resonant bidirectional SEPIC DC-DC converter. The resonant technology and high frequency operation will allow the size and cost of a battery equalizer to be reduced because of the ability to reduce the size of the magnetic components...
This paper proposes a novel control scheme for a stand-alone PV application. A two power stage approach has been used that consists of a front end high gain DC-DC converter followed by a 3φ H-bridge inverter. A general reactive load has been considered. The control scheme uses abc to dq reference frame transformation. The active power demand is controlled by regulating the dc link voltage. Reactive...
This paper proposes an output current ripple reduction algorithm using model-based predictive control (MPC) for an energy storage system (ESS). In single-phase systems, the DC/AC inverter has a second-order harmonic at twice the grid frequency of a DC-link voltage caused by pulsation of the DC-link voltage. The output current of a DC/DC converter has a ripple component because of the ripple of the...
This paper proposes an integrated circuit sharing internal parts of a low voltage DC-DC converter (LDC) and an on-board charger (OBC) for electric vehicles (EVs). The proposed circuit structure can be operated as an OBC standalone mode, a LDC standalone mode, and a simultaneous operating mode. The operating modes of the proposed system are analyzed and the advantages and disadvantages are also discussed...
A non-isolated single-stage on-board charger (OBC) for electric vehicles (EVs) has been proposed in order to satisfy high efficiency and high power density. However, the conventional works could not achieve high efficiency according to the voltage variation of the utility and the battery, especially during the step-down operation. This paper proposes an advanced control algorithm to improve the system...
Most eco-friendly vehicles can adopt a concept of an integrated battery charger (IBC), which utilizes a motor drive system for charging a high voltage battery pack. The IBCs inevitably require an additional boost inductor when the common mode inductance of the motor/generator (M/G) is too small to satisfy a condition for continuous conduction mode operation. In this paper, the IBC system with the...
Development of fast charging stations is expected to reduce the charging time required by Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). Fast charging stations require the rectification of the grid AC voltage to a DC voltage while maintaining high power factor (PF) and low total harmonic distortion (THD) on the grid side. Furthermore, the chargers must be able to provide a controllable...
This paper presents cell balancing method of single switch flyback converter with multi-winding. In the conventional converter, voltages of each secondary winding might be unequal due to the different effective turn-ratios in multi-winding. The unequal secondary voltages make the cell voltage unbalance. Individual cell control by adding a switch for each cell can reduce the undesired effect, but the...
In this paper, a new hybrid energy storage system (HESS) with batteries and ultracapacitors (UCs) is proposed. The proposed topology adopts a smaller power capacity bi-directional dc-dc converter compared with the traditional HESS by adding two switches and diodes. The cost, volume and weight of the whole system can be reduced while the power demand of DC bus is satisfied. Three working modes of the...
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