High‐gain soft‐switching interleaved switched‐capacitor DC–DC converter with phase‐shedding technique

Abstract

This study experimentally verifies the performance of a high-gain soft-switching interleaved switched-capacitor (ISC) DC-DC converter based on phase-shedding technique. Efficiency improvement especially under light load condition is achieved by introducing the phase-shedding technique, which adjusts the number of active interleaved converters based on the input power level. The interleaved configuration and modular characteristic of the converter increase the voltage gain as well as the current rating of the converter. Moreover, pulsating input current issue of conventional switched-capacitor converter is solved by the stray inductances distributed in the converter. The converter achieves high-voltage gain, improved efficiency, magnetic components free design and low output capacitance requirement. Simulation and experimental results taken from 1.5 kW prototype operating at 120 kHz are documented in this study to validate the operation and characteristics of the proposed ISC DC-DC converter.

New family of expandable step‐up/‐down DC‐DC converters with increased voltage gain and decreased voltage stress on capacitors

“…5μF is selected as their sizes. Also, by presuming the similar maximum allowable voltage ripple for the output voltage, the filtering capacitor size is obtained 2μF on the basis of Equation (21). Second, the output voltage of 225 V is aimed by having the input voltage of 25 V. Thus, the voltage gain is computed equal to 9.…”

“…These converters possess many prevalent drawbacks like large size and significant switching losses, notably for automated applications with high power and current. 21 In Abbasi et al, 13 a new SC DC-DC converter has been introduced, which has many benefits like reduced cost, less control complexity, fewer components, lower voltage stress on components, and less size over conventional topologies. In this structure, power switches have been reduced in number that makes the converter more suitable for industrial applications.…”

“…The Marx generator, charge pump, and generalized multilevel SC DC‐DC converters are the most well‐known ones. These converters possess many prevalent drawbacks like large size and significant switching losses, notably for automated applications with high power and current . In Abbasi et al, a new SC DC‐DC converter has been introduced, which has many benefits like reduced cost, less control complexity, fewer components, lower voltage stress on components, and less size over conventional topologies.…”

Non‐isolated high step‐up dual‐input DC‐DC converter with zero‐voltage transition

“…1 Accordingly, a high step-up converter is needed to increase the low voltage of the PV panels to a suitable DC bus voltage of inverters or other applications. 2 Cascaded converter, 3,4 coupled inductor, 5,6 switched capacitor, 7,8 diode-capacitor multiplier, [9][10][11] or their combination 12,13 can be mentioned for high step-up methods. By applying these techniques, the drawback of extreme duty cycles in conventional converters is solved for high step-up conversion.…”

A Zeta‐based switched‐capacitor DC‐DC converter topology

“…The conventional SC converters can be categorized as Marx generator voltage multiplier, charge pump multilevel modular converter, and generalized multilevel converter . These classic converters possess some common drawbacks, particularly for high current and power automated applications, such as large size and significant switching losses …”