Modified step‐up boost converter with coupled‐inductor and super‐lift techniques

Abstract

In this study, a modified efficient step-up boost converter is proposed. The proposed structure employs coupled-inductor and super-lift techniques to achieve high voltage gain. The super-lift stage absorbs the available energy in the leakage inductance of the coupled inductor, clamps the off-state voltage of the main switch, and reaches a moderate voltage gain. Moreover, the coupled-inductor technique offers high voltage gain, low off-state voltage for the main switch, and alleviates the reverse-recovery problem of the output diode. Hence, using these two techniques, the proposed converter achieves high step-up voltage gain and eliminates the drawbacks of the conventional boost converter. The proposed converter is analysed in details and a hardware prototype with the input voltage of 15 V, output voltage of 200 V and the nominal power of 100 W is utilised for the experimental investigation.

Performance evaluation of interleaved high‐gain converter configurations

“…The output capacitors (C T_1 and C O ) are chosen based on (18) and (19) with respect to the voltage rating. Since the output voltage is 600 V and N = 1, the output capacitor voltage rating is 300 V. A value of 25 µF is selected for C T_1 and C O considering a maximum of 5% voltage ripple.…”

“…Thus, a high voltage conversion ratio is required for DC-DC converters for transformerless configurations, which boosts the relatively low output voltage of PV panels (40-60 V) to a higher voltage (400-500 V), which meets the requirements of residential PV inverter applications [12]. Conventional transformerless boost converters cannot achieve such voltage conversion ratios and thus, a number of high-gain DC-DC converter topologies have been proposed in the technical literature [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. To increase the voltage conversion ratio, switched-capacitor converters have been proposed in [13][14][15].…”

“…However, converters need more components than conventional boost converter to achieve high voltage gain. Coupled-inductor converters are an alternative solution for obtaining high gain [18][19][20]. The considerably high gain of such converters is achieved by the coupled inductor acting as a transformer.…”

Low Input Ripple High Step-Up Extendable Hybrid DC-DC Converter

“…The energy crisis and environmental pollution have become increasingly prominent. Renewable energy sources such as photovoltaic cells and fuel-cell stacks have begun to receive worldwide attention [1]- [6]. However, the output voltages of these energy sources are usually between 12V to 60V dc, so it is essential to use a high step-up DC-DC converter to boost these low voltage to standard dc bus voltage of 380-400V for grid-connected power generation [7]- [11].…”

Transformerless high‐gain DC–DC converter for microgrids

“…To achieve higher power output, CIs have been employed in the topologies presented in [25][26][27][28][29][30][31][32][33]. Some hybrid high-gain high-power topologies have been developed from [31] and are presented in [22,32,33].…”