An integrated four port bidirectional dc-dc converter for photovoltaic energy harvesting systems

In this paper, a novel dual-loop control scheme is proposed to improve the voltage tracking performance of DC-DC boost converters. According to the conventional super-twisting algorithm, a new modified fast super-twisting algorithm (FSTA) is developed which is introduced in the strategy to enhance the convergence performance. On the basis of FSTA, a second-order sliding mode controller is designed in the inner current loop. The outer voltage loop controller consists of a nonlinear PI controller and a fast super-twisting sliding mode observer, which generates the reference current value. The uncertain terms are estimated by the fast super-twisting sliding mode observer and compensated to the outer voltage loop. Simulation results are carried out to confirm the effectiveness and superiority of the proposed control strategy.

Section: Introductionmentioning

confidence: 99%

A novel composite control for DC-DC boost converters based on fast super-twisting algorithm

Pan,

Zhang,

Gao

et al. 2024

“…The phase-shifted full-bridge (PSFB) converter is the most widely adopted topology for high-power isolated DC-DC power conversion due to its simplicity and efficiency [1][2][3][4][5][6]. In the primary side of PSFB converter, four switches are controlled with phase-shifted modulation method, which makes it possible to achieve zero-voltage switching (ZVS) without the help of any auxiliary circuits [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of novel phase-shifted full-bridge converters with wide ZVS range reduced filter requirement

Cai

Zhao

Wei

et al. 2022

In this paper, some novel converters are proposed to solve the drawbacks of traditional phase-shifted full-bridge (PSFB) converter. In the primary side of proposed converters, the FB inverter is divided into two half-bridge inverters and the large-sized transformer is replaced by two small-sized transformers. By employing this structure, the zero voltage switching range can be extended and the primary circulating current existing in the additional PSFB converter is removed. In the secondary side, various rectifiers can be adopted to suit for different applications. Moreover, the primary power can be continuously transferred to secondary side in the proposed converters, which contributes to the reduction of output filter requirement. The circuit configuration, operational principle and relevant analysis of proposed converters are introduced in this paper. Experimental results on two typical prototype converters are built to validate the theoretical analysis.

“…Although ZCS technique can significantly reduce the tail current of the IGBTs, the maximum switching frequency of the IGBTs limits the magnetic components and space-constrained design. The converters in [24][25][26][27][28][29][30] use two half bridges to form the TL structure. Although it can eliminate the circulating current, in the primary side auxiliary circuit is also added to limit the ringing of the In this paper, a novel TL DC/DC converter with wide ZVS range, reduced circulating current and low filter requirement is proposed.…”

Section: Introductionmentioning

confidence: 99%

A series-connected asymmetrical PWM half-bridge three-level converter with reduced circulating current

Zhang

Chen

Zhao

et al. 2022

A novel three-level (TL) converter topology is proposed in this paper. The primary side of the proposed converter consists of two asymmetric half-bridge inverters, which are connected in series. The rectifier stage is composed of two parallel full-bridge-rectifier (FBR) which use the same diodes as the common current path. The asymmetrical-PWM control is employed to regulate output voltage. Compared with the traditional TL converters, the circulating current can be significantly reduced. Moreover, all the switches can achieve ZVS performance with a small leakage inductor over wide load range. The parallel connection of the two FBR also helps to reduce the current ripple of the filter inductor, leading to high density switching converter design. In this paper, a laboratory prototype(480-600 Vdc input, 96Vdc/12A output) based on the proposed converter is built to validate the theoretical analysis.