Zero voltage switching interleaved coupled inductor synchronous buck converter operating at boundary condition

Abstract

A zero voltage switching interleaved coupled inductor synchronous buck converter operating at discontinuous conduction mode (DCM)/continuous conduction mode (CCM) boundary condition is presented for step-down applications. To increase the duty cycle, coupled inductor structure with lossless clamp circuit is used. Moreover, operating at DCM/ CCM boundary has increased the efficiency by reducing the switching losses. However, this approach results in high output current ripple. To further reduce the input and output current ripple, interleaved structure is employed. Thus, high efficiency and low current ripple are the merits of the proposed converter which make it a proper choice for voltage regulator module applications. The operation of the proposed converter is analysed and design considerations are discussed. The experimental results obtained from an implemented prototype are provided to verify the theoretical analysis.

Two‐phase high efficiency interleaved buck converter with improved step‐down conversion ratio and low voltage stress

“…To achieve a higher step-down ratio, the proposed IBC does not require any transformer or coupled inductor [13,16]. The proposed IBC has higher step-down conversion ratio than the existing IBCs [11][12][13]16]. An IBC with higher step-down conversion ratio is introduced in [22].…”

“…It operates below 50% duty cycle and the voltage stress of the semiconductor devices is equal to the input voltage. At boundary conditions, a coupled inductor-based synchronous IBC is presented in [13]. The converter achieves a high step-down conversion ratio by using the turns ratio of the coupled inductor.…”

Ultra‐high step‐down ZVS synchronous buck converter with low switch voltage stress

“…A ZVS interleaved synchronous buck converter is proposed in [34]. In this converter, coupled inductors are used to improve the voltage conversion ratio.…”

Advanced small‐signal‐based analytical approach to modelling high‐order power converters

“…A variety of methodologies have been proposed and applied to control different operating modes of power converter systems (PCSs), which mainly include bifurcation mapping [16][17][18][19] and small signal analysis [20][21][22]. Bifurcation mapping establishes an average model to map the corresponding parameters, which is inaccurate due to the lack of accuracy in approximating the practical model and very difficult or not possible to map a system with a large number of state variables.…”