A non‐isolated high voltage gain DC–DC converter based hybrid switched LC network for renewable energy applications

Abstract

This paper presents a new high voltage gain DC–DC converter for renewable energy applications without the need for a galvanic isolation. The converter combines the active switched‐inductor network and the switched‐capacitor network to boost the voltage gain ratio without a high duty ratio. The presented converter uses clamping capacitors to minimize the maximum voltage stress of the power‐switching devices; hence, low power rating devices can be employed. Furthermore, the converter operates at a high switching frequency. Therefore, the use of small inductors and capacitors is the main advantage. The paper describes in detail the operating mode and design procedures of the converter. Additionally, the associated power losses and the efficiency are calculated. A 200‐W laboratory prototype was fabricated, and experimental results verified the theoretical analysis.

Evaluation, design, and test of single switch high step‐up boost converter with autotransformer

“…In a lossless ideal transformer, as shown in Figure 1B, where the input power can be considered equal to the output power (1). All the energy delivered to the output is magnetically processed by the core, changing the voltage and current levels depending on the turns-ratio of the transformer N 2 /N 1 (2).…”

“…For these reasons, alternatives have been sought for energy production, such as renewable energy sources. 1 Solar energy has shown promise within renewable energy sources. Solar panels provide a low voltage level (<50 V) compared to grid (220 V rms ) or a DC nanogrid bus (400 V).…”

A modified Z‐source switched‐capacitor based non‐isolated high gain DC‐DC converter for photovoltaic applications

“…Therefore, in a parallel‐connected configuration, a reliable DC‐DC converter with high gain is required to step up the output voltage to desired high levels. Many converter topologies are introduced as boost, Cuk, Zeta, and SEPIC converters capable of providing higher output for a low input voltage in Padhee et al, 6 Koç et al, 7 Kumari et al, 8 and Alsolami and Allehyani 9 and their control in Shen et al, 10 Yin et al, 11 Liu et al, 12 and Wu et al 13 However, realistically, the feasible voltage gains of the above‐mentioned converter topologies are in a limited range, and their power switches have substantial losses. The aforementioned converters are unable to provide high step‐up voltage at the output, as required for many applications.…”

Modular DC‐DC converter with reduced current ripple and low voltage stress suitable for high voltage applications

“…Also, the voltage lift (VL) technique should be combined with other techniques such as switched inductor (SI) or switched capacitor (SC) to achieve the target voltage conversion ratio. To nail this purpose, more power switches are used with different voltage stresses 14–16 . The high gain coupled inductor (CI)‐based dc‐dc structures provide the turn ratio of windings as an additional degree of freedom alongside duty cycle of main switches 17–19 .…”

“…To nail this purpose, more power switches are used with different voltage stresses. [14][15][16] The high gain coupled inductor (CI)-based dcdc structures provide the turn ratio of windings as an additional degree of freedom alongside duty cycle of main switches. [17][18][19] However, it is necessary to apply a clamping circuit in order to eliminate the voltage spikes upon their power switches generated by the presence of their leakage inductances.…”