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This paper proposes LED current control method of dimmable LED driver with dual active bridge (DAB) DC-DC converter for 1kW-class LED floodlight. The LED current control method is discussed in detail. The conventional LED driver cannot control turn-off time of LED current because the power flows from source side to LED floodlight side only. DAB converter is a bidirectional DC-DC converter formed by...
A low latency Vernier delay-line-based window ADC capable of simultaneous quantization for digital control single-inductor-multiple-output (SIMO) DC-DC converter is proposed in this work. The ADC converts signals of feedback voltages and sensed inductor current by voltage-time converter (VTC) and successive time-digital converter (TDC). Together with a subrange quantization scheme, a preceding interleaving...
The conventional structure of buck-boost inverter uses IGBTs. IGBTs have features like long tail current, fixed voltage drop and that is why its switching losses are high. In this paper switching cells structured buck-boost inverter is proposed. In switching cell structure, MOSFETs and external diodes with very fast reverse recovery characteristics are used, while the body diodes have no chance of...
Solar energy has the characteristics of intermittent and unstable, and it results in the negative impact on power quality of the utility grid while the penetration rate of the grid-connected photovoltaic generation system is increased. The energy storage system (ESS) can alleviate the negative impact on power quality of the utility grid so as to increase the penetration rate of the grid-connected...
This article presents the efficiency analysis of a 5 MW wind turbine generating system in an all-DC wind park comprising of a permanent magnet assisted synchronous reluctance generator (PMaSynRG) system as well as an IGBT equipped forced-commutated inverter. In this article, the focus is on the NPC converter and DC-DC converter with an optimized high-frequency transformer. The total efficiency through...
The magnetic coupling of filter inductors is widely utilized in various power electronics application fields including dc-dc converters in EV charger system in order to enhance the filtering performance while maintaining the minimal filter size. The optimal distribution of self and mutual inductance of coupled inductor is regarded to be one of important design tasks with respect to the coupled inductor...
The purpose of this paper is to present the wide feedback gain changeable control dc-dc converter to improve the transient response. In general, the control gain is set to a value as large as possible considering the stability of the system when a quick response is required. A quantization error has the resolution of the digital controller coarse in such a case. Also, the oscillation based on the...
This paper topics the effect of the phase-number and the semiconductor-device selection on the volume and weight of a medium-voltage (MV) DC-DC converter intended for offshore wind turbines. In recent years, many papers have discussed the transposition from MVAC to MVDC collector grids in offshore wind, where the main motivation is to reduce losses of the system. The authors have identified that the...
This paper aims to comprehensively investigate the efficiency, power density and overall cost of input series output parallel (ISOP) medium voltage (MV) all silicon carbide (SiC) DC-DC converter in solid state transformers (SST). The medium voltage capability can be achieved by using either high voltage devices or multiple low voltage cells in series. Voltage rating of semiconductor devices, magnetic...
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...
A transformerless high step-down DC-DC converter is presented in this paper. The voltage-divider and switched-inductor techniques are employed to achieve high step-down voltage gain for the proposed converter. For the voltage divider, two capacitors with same capacitance are connected to the DC source. For the switched inductor, two inductors with same inductance are in series at the switch ON-period...
The voltage boosting control (VBC) is presented to achieve low-power and high slew-rate error amplifier for enhancing the load transient response of dc-dc converters. The VBC is employed to increase/decrease the gate voltages of the output-stage transistors of the error amplifier, leading to large current driving capability with simple circuitry during transient. In addition, the accelerative scheme...
This paper presents a new non-isolated dual-input dc-dc converter. The proposed converter can transfer energy from different input sources to the output load individually and simultaneously. In addition, by operating in the step-up/down mode, the input voltages can be higher or lower than the output voltage which leads to a wide input voltage range. This feature is suitable for renewable energy systems...
A novel high step-up DC-DC converter with ZVS turn-on switches and ZCS turn-off diodes based on several existed techniques such as coupled-inductor, active clamping, stacked capacitor and interleaved technique is designed and implemented in this paper. The main objective of proposed circuit is soft-switching operation. The leakage inductance of coupled inductors resonates with two secondary-side capacitors...
A DC-DC converter for high-power battery chargers with the power-capacity over 6.6-kW for electric vehicle (EV) is proposed in this paper. Due to a new architecture, the proposed converter achieves the reduction of conduction loss at the primary-side by as much as 50% and has many benefits such as reduced circulating current, less duty-cycle loss, and lower secondary-voltage stress. In addition, its...
The photovoltaic (PV) grid-connected power system in the residential applications is becoming a fast growing segment due to the shortage of the fossil fuel energy and the great environmental pollution. A new research trend in the residential generation system is to employ the PV parallel connected configuration rather than the series-connected configuration to satisfy the safety requirements and to...
In high voltage gain application scenarios, diode-capacitor network can be used to achieve a relatively high voltage gain and at the same time reduce the demand of magnetic component, which considerably improves the efficiency and power density. In this article, the topology of a high step-up DC-DC converter based on multi-cell diode-capacitor network and coupling inductor is proposed to attain a...
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