Integrated soft switching cell and clamp circuit for interleaved high‐step‐up converters

Abstract

An integrated soft switching cell and clamp circuit suitable for interleaved high-step-up converters with coupled inductors is proposed in this study. This cell is applied to an interleaved boost converter with winding cross-coupled inductors and series capacitors. The main contribution of the study is presenting a simple auxiliary circuit which provides soft switching condition and acts as a clamp circuit. In addition, only one auxiliary circuit is utilised for both phases of the proposed converter in order to absorb the energy of the leakage inductances and achieve fully soft switching condition. To verify the theoretical analysis and the operation of the proposed converter, a 300 W prototype converter with 24-380 V conversion ratio is implemented.

Quadratic boost converter with low‐output‐voltage ripple

“…2e. C 2 is discharged by the output current I o , whereas C 1 is charged by I L1 −I L2 −I o , since I L1 is always larger than I L2 + I o as it can be seen in (7) and (8). Hence, the linear ripple can be expressed as…”

“…For example, high-gain topologies based on multilevel stages have been investigated [4,5]. Other plausible solutions may be found based on magnetic coupling [6,7]. Another alternative is the use of quadratic gain converters [8][9][10][11][12][13][14][15].…”

Interleaved high step‐up ZVS DC–DC converter with coupled inductor and built‐in transformer for renewable energy systems applications

“…Although the leakage inductance can provide natural zero current switching (ZCS) in the converters of [28–30], however, it does not effectively reduce the switching losses and as a result, the switching frequency cannot be pushed to high levels for decreasing of the converter volume. Active clamp technique is utilised for zero voltage switching (ZVS) performance in [31–37]. All active switches achieve ZVS operation and both of the switching losses and the imposed voltage on the MOSFETs are significantly decreased.…”

High step‐up interleaved zero‐voltage transition DC–DC converter with coupled inductors

“…Consequently, soft-switching methods are applied to the interleaved structures to decrease switching losses at high frequencies. As a result, many researchers used ZVT and ZCT methods as a suitable soft-switching technique to high-frequency interleaved high step-up PWM DC-DC converters [17][18][19][20][21]. A single auxiliary switch is used in [17] to create a soft-switching condition and decrease voltage stress across the main switch.…”