0278-0046 (c) 2018 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/TIE.2018.2880715, IEEE Transactions on Industrial Electronics Abstract—In this paper, a single-inductor dual-output (SIDO) DC/DC converter is proposed. The significant feature of the proposed converter is feeding a constant power load in low voltage side (LVS) port, where even feeding a variable load at LVS doesn’t have any cross regulation to high voltage side port with the desired approximation. Magnificently, both merits are obtained in open-loop manner which is an outstanding characteristic in comparison with existed converters. In this paper, soft commutation and soft switching of switches and diodes are investigated along with the aforementioned main novelty. Moreover, detailed theoretical analyses of the proposed SIDO DC/DC converter in continuous conduction mode are presented besides the comparisons with some other structures. Finally, theoretical analyses are verified through a 1500W experimental prototype results. Index Terms—Single-inductor dual-output converter, Zero voltage and zero current switching, Soft commutation, Constant power load, Cross regulation. I. INTRODUCTION mong different types of loads, some categories of them behave as constant power loads (CPL)s i.e. the voltage and current of these loads have inverse relation somehow the power remains constant during load changes [1,2]. Then, by inducing negative impedance characteristics to the system, their feeding system is unstable. This phenomenon is analyzed in details in [3]. Several methods to feed a CPL are presented such as designing the controller considering Lyapunov stability theory [4], using auxiliary components or implementing appropriate control loops including linear and non-linear feedback control [5,6,7]. Due to the non-linear function of the loaded motor drives and converters and also increasing negative impedance effect of CPLs, linear classic control methods have restriction to achieve proper stability [3]. Thus, stabilizing control methods using large signal stability ensures the CPL systems reliability. In [8], virtual impedances are used to analyze resonance damping of LCL filters in systems with CPLs. The stability enhancement is also achieved with sliding control mode, by using virtual capacitance and large Manuscript received April 17, 2018; revised June 03, and August 22, 2018; accepted October 22, 2018. E. Babaei is with the faculty of Electrical and computer Engineering, University of Tabriz, Tabriz 51666, Iran, and also with the Engineering Faculty, Near East University, 99138 Nicosia, North Cyprus, Mersin 10, Turkey (e-babaei@tabrizu.ac.ir) Y. Azadeh, H. Tarzamni and M. Sabahi are with the Electrical and Computer Engineering of University of Tabriz, Tabriz 51666, Iran (yalda.azadeh94@ms.tabrizu.ac.ir, hadi_tarzamni@yahoo.com, Sabahi@tabrizu.ac.ir) signal analysis in [4, 9, 10], respectively. Moreover, in recent research [11], a mixed sensitivity based repetitive controller, in which a sliding control mode and Lyapunov design control techniques are applied. Several single-inductor multi-output (SIMO) DC/DC converters have been presented in recent literature. The magnificent feature of these converters is to use one compact multi-output structure rather than several independent converters. Nowadays, SIMO converters have been extended in several applications such as hybrid power source systems [12,13], portable devices and energy harvesting circuits [14,15] and etc. The main problem of SIMO converters is their cross regulation (CR) [16-18]. In [19], the reason of this phenomenon is analyzed in details. In [20-24], model predictive voltage, power multiplexed, adaptive current compensation, current feedback and tail current control strategies are used, respectively, to overcome CR as possible. In [21], a time-multiplexing control method is introduced to decrease CR in discontinuous conduction mode (DCM) operation. However, this technique is appropriate just for DCM operation of the converter. Furthermore, an auxiliary switch is used for each output channel to diminish CR. In spite of one extra switch for freewheeling path, current sensing circuits and elaborated control algorithm, injection of a DC offset current is suggested in [25] to improve the converter operation in continuous conduction mode (CCM). In [26], the relevant equations between two output channels of a single-inductor dual-output (SIDO) converter are extracted, which are performed for DCM and CCM operations. Nevertheless, it is just probable to extract the equations in the cases at least one of the output ports voltage is higher than the input one. On the other hand, diminishing turn ON/OFF losses of semiconductor devices specifies huge importance in power electronic converters. This could be provided by utilizing auxiliary circuits [27], an additional active element [28], extra resonant components [29], parasitic capacitors of semiconductors, leakage or magnetic inductance of the transformer [30,31] and etc. Among the aforementioned methods, involving parasitic capacitors and circuit instinctive inductances in operational modes to reduce the power losses is one of the most economic and efficient solutions. In current-fed converters, a mismatch current between the input inductance and leakage inductance of the transformer causes current spikes across transformer terminals in commutation mode. In [32], an active clamp circuit is presented for soft commutation. In [33], a passive commutation circuit is suggested, in which the returned energy from transformer leakage inductance into the snubber circuit is lost in commutation resistance as [32]. In Single-Inductor Dual-Output DC/DC Converter with Capability of Feeding a Constant Power Load in Open-Loop Manner Yalda Azadeh, Ebrahim Babaei, Senior Member, IEEE, Hadi Tarzamni, Student Member, IEEE, and Mehran Sabahi A