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This paper proposes an adaptive democratic current sharing control scheme for interleaved dc-dc converters under faulty condition. The proposed fault tolerant control approach can achieve the desired output voltage generation, and equal current sharing among the remaining healthy modules as more and more modules fail. The main idea is to adaptively change the outer voltage and inner current controller...
In this paper, a non-isolated interleaved input-parallel output series structure soft-switching bidirectional dc-dc converter with PWM plus phase shift (PPS) control is proposed. The proposed converter can achieve zero-voltage-switching (ZVS) of all switches in continuous current mode (CCM) under bidirectional power flow. Even though step-up/down ratio is about 3.5 times compared to the conventional...
The Class E dc-dc converter, operating with the switching frequency up to multi-megahertz, is usually regulated by the basic ON-OFF control. In this paper, it is found that in the basic ON-OFF control, the resonant inductor current of the Class E dc-dc converter will be increase with the rise of the input voltage, which will enhance the output capacity of the converter and also increase the ON-OFF...
This work presents the design of an autonomous, cost-effective and efficient solar powered irrigation pump using a switched reluctance motor (SRM) drive. The proposed system utilizes a modified CSC (Canonical Switching Cell) converter for power optimization of photovoltaic (PV) array. The continuous inductor current mode (CICM) working of DC-DC converter significantly minimizes the stresses on its...
This paper presents comparison of GaN based switched-tank converter (STC) and traditional cascaded voltage divider (CVD) dc-dc converter for data center applications. The operation principle of two kinds of converters are presented. And simulations with Saber are both conducted to verify the proposed comparison, respectively. The system volume and efficiency are fully compared via GaN based device...
Inclusion of renewable energy resources in the energy mix is one of the fastest growing trends in both developing and industrialized societies to reduce dependency on fossil fuels and other non-renewable resources. This work proposes the design of solar assisted motor drive that can be used with single-phase (1φ) or three-phase (3φ) induction motors with a soft phase conversion without requiring a...
This paper discloses the development of modular front-end medium-voltage solid-state transformer (SST) to show system level design, circuit topology, and prototype test results. Each multilevel front-end module consists of two stages: (1) ac to dc boost converter with power factor correction dc and (2) isolated dc-dc LLC converter. The proposed system has been designed, simulated, and fabricated with...
This paper describes transient response improvement of digitally controlled synchronous rectification buck-type dc-dc converter using feedforward compensation. Transfer function of the feedforward element was introduced by the state space equation. The steady state characteristics of the converter using the feedforward element were same as the converter without using the element, but transient responses...
This paper gives a detailed analysis about the causes of the voltage distortion caused by dead time in dual active bridge (DAB) DC-DC converter. The zero-crossing point of the equivalent leakage inductor's current is the definitive factor for various voltage distortion phenomena, which is determined by dead time and phase-shift ratios. Based on the switching characterization of DAB in dual-phase-shift...
A novel isolated high step-up gain DC-DC conversion system for HVDC grid-connected PV power generation applications is proposed in this paper. The proposed system has a distributed MPPT and centralized step-up DC-DC configuration. By employing distributed MPPT converter, high power losses caused by partial shading of the PV arrays can be reduced significantly. Modular scheme is adopted for the centralized...
In this paper, a Boost type control strategy is proposed to solve the problems of large power backflow and low conversion efficiency in dual active bridge bidirectional DC-DC converter which occur in the traditional phase-shifted control strategies. In the condition that the main topology circuit is not changed, the control strategy proposed in this paper can make the circuit work in Boost state every...
In this paper a full-bridge phase-shift DC-DC converter that has the function of realizing zero-voltage switching (ZVS) is adopted into power electronic transformer (PET), and the functions of every part employing proper control strategy in the PET are analyzed. The simulation results show that this converter can still realize soft-switching in PET and it is appropriate to work in high frequency state...
Solar electrical energy generation and its conversion techniques gain more attention because Photo Voltaic (PV) power generation system is more attractive due to its advantages among all the RESs (Renewable Energy Sources). In this paper, Isolated SEPIC(Single-Ended Primary-Inductance Converter)converter fed grid connected Multilevel Inverter is proposed. SEPIC converter is a buck-boost derived topology...
This paper proposes a DC-DC modular multilevel converter (MMC) topology for MVDC and HVDC applications that does not require ac transformers or coupled inductors. The DC-DC MMC comprises two dc-dc subconverters that are interlinked in a symmetric manner, whereby the modulated ac voltages remain isolated from the dc terminals. This enables a substantial reduction in converter size, weight, capital...
Supercapacitors (SCs) are also known as Electric Double-layer Capacitor (ELDC) or Ultracapacitors. In the high voltage applications, the supercapacitors are connected in series, so that the voltage imbalance will occur because the SCs are not identical. This different parameters of the cells caused by many factors for instance the internal parameters of supercapacitors (Capacitance, Equivalent Series...
This paper proposes a new technique to design and implement the dead-time controlled PWM signals using a small and low-cost microcontroller. The PWM signal generator and controller are the heart of the DC-DC converter and other switching applications. The proposed technique utilizes the Output Compare modules and Timer modules of the microcontroller. These modules are the basis of most microcontrollers...
Inside the meshed LVDC distribution grids the power flow is predominantly limited by the line impedances. In order to achieve economical and flexible operation of the meshed LVDC distribution grids, it is required to control the power flow. For that end, the line impedances need to be adjustable. The line impedance can be controlled by a DC-DC transformer, however, it needs to be rated for the full...
In this paper, the essential reason of causing the dual-side reactive currents in the isolated dual active bridge (DAB) DC-DC converter is revealed. It is because that the output voltages of the two H-bridge converters of the DAB converter can not keep their polarities the same as the inductor current all the time. The constraint between the two inner phase shifts and the outer phase shift is determined...
Safety has become extremely important, even when the market is demanding faster charging of mobile batteries. Single-chip battery chargers cannot safely deliver the current needed because power density will exceed the package limit and create thermal hot spots. Therefore, a master-slave battery charging system using parallel DC-DC converters is presented. The master charger acts as a voltage or current...
Four-level buck DC-DC converters (FLB), as strongly coupled, multi-input multi-output and under-actuated 4th-order nonlinear systems, require relatively complex control to meet desired demand. Traditional control methods such as proportional-integral (PI) with linear decoupling either have slow dynamic response and incomplete decoupling, which means a conflict in performance among the output voltage...
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