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This paper introduces a novel isolated hybrid resonant converter with smooth transition between multiple operating modes. With the simple addition of a bidirectional ac switch, the highly-efficient series resonant converter operating in the discontinuous conduction mode (DCM) is combined with a phase-shifted full-bridge buck converter and a pulse width modulated (PWM) boost converter in order to provide...
Integrated-magnetic interleaved-boost converters are under development for high-current, high-power applications ranging from automotive fuel cells to photovoltaics. This paper presents an investigation of the various continuous-current and discontinuous-current modes of operation of the integrated-magnetic interleaved two-phase boost converter. Experimental validation is presented from a low-power...
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...
Currently acknowledged, as a rapidly emerging technology, High-Brightness Light-Emitting Diodes (HB-LEDs) are considered the true alternative to many mature technologies (i.e., incandescent bulbs, compact fluorescent lamps, etc.) due to their high efficiency, low maintenance and durability. It is evident that the HB-LED driver must be durable and efficient to achieve these advantages. Moreover, in...
This paper introduces a novel bridgeless resonant ac-to-dc converter, capable of efficiently converting arbitrary low-amplitude input voltages into a regulated dc voltage. High-frequency resonant operation owing to LC resonance allows small footprint for passive components, thereby increasing the circuit power density without suffering from switching losses. A resonant gate drive circuit is designed...
This paper suggests a new method to balance the voltage of the two capacitors in the three-level neutral-point clamped (NPC) converter. The proposed method only needs the information of two capacitor voltages. The two capacitor voltages are fed back to the controller and then the controller generates phase shifting value with which sinusoidal modulation will be adjusted to the left or right. This...
The main objective of this paper is to study a seven level multi string converter topology for distributed energy resources based DC-AC conversion system. This paper proposes the Karnaugh mapping technique (which was rarely used in power electronic converters) for modeling the multi string seven level converter. The proposed method can also be extended to ‘n’ level converter. This paper also proposes...
Field experiences have demonstrated that semiconductor devices are vulnerable to failures (open-& short-circuit). In many critical applications, such failures are unacceptable and high system reliability is required. In this paper, a topology modification for the T-type 3-level inverter is explored to achieve the fault-tolerant operation and enhance the system reliability in the case of device...
This paper presents a study of a generalized multilevel asymmetric inverter based on a H-Bridge Cell with one Arm Series (CHB-as) and five switches. It is shown several asymmetrical arrangements of input source combinations that produce several equally spaced voltage levels with few components. Equations for determining the switching frequency employed in the low power processing cells are developed,...
Engineering design of structure and bus bar for a three phase 1.2MVA hybrid clamped five-level (HCFL) converter module is presented in this paper. Firstly, the commutation characteristics of the HCFL topology are analyzed. Based on the analysis, a decoupling structural design is proposed to eliminate the negative effect of high frequency current. Secondly, a laminated design for bus bar is employed...
An important functionality of the Solid State Transformer (SST) is the integration of renewable energy sources within the topology itself, acting as a renewable energy hub. Due to the fluctuating nature of the renewable energy source, such integration becomes a challenge and energy storage becomes a requirement. In this paper a topology variant of single phase SST with multi limb magnetic core is...
In this paper, the common mode (CM) EMI noise characteristic of three popular topologies of resonant converter (LLC, CLL and LCL) is analyzed. The comparison of their EMI performance is provided. A state-of-art LLC resonant converter with matrix transformer is used as an example to further illustrate the CM noise problem of resonant converters. The CM noise model of LLC resonant converter is provided...
Lack of DC short circuit fault blocking and ride through capability is one of main issues in applications of Modular Multilevel Converter (MMC) to actual HVDC transmission system. Recently, several topologies have been proposed to provide DC short circuit fault blocking capability and/or DC fault ride through capability. In this paper, the operation principles, functionalities, and characteristics...
This paper introduces a concept of a switching cell that utilizes the reconfiguration of series and parallel connections in DC-DC converters. The switching occurs at high switching frequency and the switches can be integrated to be within the solar panels or in between the solar cells. The concept is generalized and applied to basic boost and buck topologies. Analysis and experiments for the reconfigurable...
This paper proposes a single-phase three-level split DC-bus inverter for individual maximum power point tracking (MPPT) controls. With only eight switches and one filter inductor, the proposed system provides compact and cost-effective circuits in comparison with conventional single-phase individual MPPTs topologies. The proposed system has two split DC-buses from conventional single-phase three-level...
This paper proposes a novel topology which is capable of operate two permanent-magnet synchronous machines (PMSM) using a single 6-bridge inverter and its control method. In the conventional parallel connection method for this application, two motors can operate only at the same speed and have a high risk of loss of synchronism since the single voltage is applied to both motors. In other inverter...
Conventionally in wireless power transfer applications, symmetrical resonant tank (SRT) type, which employs an identical physical geometry for transmitter coil (Tx) and receiver coil (Rx), has been popular because it minimizes the leakage flux. However, for portable applications it is desirable to minimize size and weight of Rx, while Tx should provide stronger and more uniform magnetic field. Consequently,...
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...
The unipolar gate driving method provides a low cost and simple solution for inverter system design. However, the unipolar gate driving can cause issues like ‘parasitic oscillation’ during turn-on of power switches and ‘unintended parasitic turn-on’ caused by the Miller-effect of power semiconductors. Hence the maximum value of gate resistance has to be limited. To overcome the above mentioned issues,...
In this paper, an improved control loop based on feedforward is proposed to reduce the total harmonic distortion of the input current (THDi), realizing power factor correction (PFC) in MCM. The frequency responses of the input impedance for a wide frequency range are improved and unified by adding feedforward duty-ratio to the output of the original current-loop. A 5 kW experimental prototype is built...
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