This study proposes electrolytic capacitor (EC) less power factor correction (PFC) light emitting diode (LED) driver with reduced current ripple. Generally PFC LED drivers need massive ECs to diminish output current ripple. The life‐span of LED driver significantly reduces due to short life‐span of ECs, and hence demands for EC‐less LED drivers. The proposed LED driver is composed of non‐inverting buck‐boost PFC converter and bi‐directional converter (BDC) for ripple current cancellation which replace the short‐life ECs with long‐life film capacitors. The PFC converter is designed with discontinuous conduction mode in order to ensure unity power factor operation. The role of BDC is to absorb second harmonic ac ripple current of PFC converter and allow the dc current to LED load. In addition, the desired BDC output voltage ( v _cbc ) is higher than the PFC output voltage ( V _LED ) irrespective of ac source voltage, hence, simplifies the control complexity. Theoretical analysis and predictions of the system have been validated using MATLAB/Simulink simulation, and experimentally validated with a prototype of 7 W. The results evident that PFC integrated BDC provide reduced ripple current with film capacitor as compared with EC counterpart and hence increase the life‐span of LED driver.

Power availability from renewable energy sources (RES) is unpredictable, and must be managed effectively for better utilization. The role that a hybrid energy storage system (HESS) plays is vital in this context. Renewable energy sources along with hybrid energy storage systems can provide better power management in a DC microgrid environment. In this paper, the optimal PI-controller-based hybrid energy storage system for a DC microgrid is proposed for the effective utilization of renewable power. In this model, the proposed optimal PI controller is developed using the particle swarm optimization (PSO) approach. A 72 W DC microgrid system is considered in order to validate the effectiveness of the proposed optimal PI controller. The proposed model is implemented using the MATLAB/SIMULINK platform. To show the effectiveness of the proposed model, the results are validated with a conventional PI-controller-based hybrid energy storage system.

This paper introduces novel high-gain tertiary port boost converter (HGTPBC) designed for hybrid energy sources such as solar photovoltaic (PV) and fuel cells (FC). The converter is employed with dual input sources by facilitating modular converters and accomplishes a high step-up voltage gain by virtue of a voltage multiplier in a DC microgrid, where the prosumers can have an islanded operation. The proposed topology allows home appliances to be powered by multiple energy source without the need for a large storage unit. Key features include continuous input current, reduced normalized voltage stress on switches, expandability for multiple input sources and independent source control. The independent control facilitates the standalone operation with single source during source failure or absence. To evaluate the converter performance, a thorough steady-state analysis, both with and without consideration of nonidealities is carried out. Detailed comparisons with existing converter topologies highlight the advantages of the proposed converter. Moreover, the loss distribution and efficiency analysis of proposed converter are presented and found to be 91.59% efficiency at rated power. Theoretical aspects are validated through hardware testing on a 100W laboratory prototype.

In this paper, an efficient soft-switched LED driver with input regulation is proposed. The converter drives multiple lamps, and it is divided into two sections. Lamp-2 and lamp-3 are driven by a full bridge converter (FBC), while lamp-1 is placed in series with the input DC voltage source. Power is delivered to lamp-1 without passing through the FBC, which results in improved efficiency. The main benefits of the presented LED driver are: (1) Lower current ratings of the FBC switches, (2) Ripple free lamp currents, (3) Zero voltage switching (ZVS), (4) High power efficiency, (5) Drives multiple lamps, (6) Input regulation for source variation and (7) Lower components per lamp. To reduce the current rating of FBC switches, two identical lamps are powered using interleaved inductors. Owing to this the lamps experience ripple free currents. Further, due to this, the ZVS is achieved which results in high efficiency. A closed-loop buck boost converter will compensate for the variations in input by adjusting the duty cycle. The converter operating modes, steady state, and efficiency analysis are discussed in detail. Moreover, to indicate the performance of the converter, a 130 W prototype is built, and experimental results are presented.