Design of a switched‐capacitor boost converter utilizing magnetic coupling with capability of right‐half plane zero elimination

Abstract

The dynamic operation of the conventional boost converters is limited in the continuous conduction mode, due to the presence of at least one right-half plane (RHP) zero in their control transfer function which can limit the open-loop bandwidth of the converter. This problem complicates the control design for the output voltage regulation and conversely influences the closed-loop system stability. To cancel this problem, a new step-up boost converter using the magnetic coupling and the switched capacitor (SC) is presented. In the proposed converter the effect of the RHP zero can be successfully eliminated, the voltage transfer ratio can be enhanced and the circumstances are provided to reach a small operating duty cycle as well as stress reduction of the diodes and power switch. Using the averaging technique, the state-space model of the converter is analytically studied and the essential conditions are given for achieving a minimum-phase structure. Based on the mentioned advantage, a simple classical PI controller for the output voltage regulation is designed. To confirm the theoretical analysis of the proposed converter, simulations and practical results are presented. Also, the performance of the proposed converter is compared with the other boost converters without RHP zero.

Analysis and circuit design of isolated forward SEPIC converter with minimum-phase stability

“…A wellknown method is to use a converter with no RHP zero, instead of an expensive controller. Therefore, several nonisolated topologies have been introduced in recent years with no RHP zero in their dynamics, such as tristate converter (Kapat et al, 2009), KY converters (Hwu and Yau, 2009), diode-capacitorbased converter (Zhang et al, 2017b), third-order converter (Veerachary, 2018) and coupled-inductor converters (Restrepo et al, 2011;Singh and Mishra, 2013;Gu et al, 2015;Garg et al, 2016;Liu and Zhang, 2017;Kumar et al, 2020;Goudarzian et al, 2020aGoudarzian et al, , 2020bGoudarzian et al, , 2021Goudarzian, 2022Goudarzian, , 2023b. However, the maximum voltage gain of some converters is small.…”

A new technique for right half plane zero elimination from dynamics of a boost converter using magnetic coupling concept

“…However, the structure of these converters has an uncommon ground problem, leading to the leakage current increase of the diodes and, sensitivity to the noise at the large gains and high powers. Diode-capacitor-based high gain dc/dc topology and switched capacitor-based boost converter are deigned via RHPZ alleviation in Zhang et al (2017) and Goudarzian et al (2020b), respectively. However, the diode-capacitor-based converter needs to a damping network circuit for the perfect operation, leading to the efficiency degradation and further complexity.…”