Regarding the converter topologies currently employed in the field of module-level power conversion, the flyback converter [5,6] is gaining popularity since it provides important benefits such as galvanic isolation, high power density, easy voltage step-up, and low number of components [4]. Moreover, paralleling flyback units is a straightforward way to deal with the harmful mismatch effects among PV modules. However, for the flyback topology to be competitive with other circuit configurations, challenges related to the conversion efficiency and system reliability must be met [7]. Several articles in the literature report the application of flyback converters to PV systems [8, 9, 10, 11, 12, 13, 14, 15, 16]. Most of these works are based on an interleaved topology that consists of splitting a full converter into several standard flyback cells, each managing a part of the converter overall power [15,16]. An input-parallel output-parallel (IPOP) interleaved flyback converter is presented in [8], where two flyback cells are considered, and a single-phase inverter is connected between the DC/DC stage and the grid. The reduction of the current ripple as well as the reduction of the size of the passive elements are mentioned as a contribution. For the same IPOP interleaved flyback topology, in [9], a control scheme based on selecting the operating mode of the flyback cells (discontinuous conduction mode (DCM), boundary conduction mode, or a combination of both) is proposed to optimize the efficiency. These operating modes are further investigated in [10] for a grid-tied interleaved flyback microinverter, aiming to optimize the efficiency in a wide load range. In [11], an IPOP interleaved converter based on three flyback cells is presented. In this case, as the number of parallel DC/DC cells increases, the current ripple is reduced, as well as the size of the passive filtering element. An input-parallel output-series (IPOS) interleaved flyback converter is described in [12]. This circuit configuration can achieve a higher output voltage compared to the IPOP topology; however, the output diodes' current rating is rather high. The integration of harmonic injection capability into an interleaved flyback inverter is thoroughly investigated in [13]. This method is studied for the implementation of an active anti-islanding scheme. Moreover, a mathematical model is proposed to accurately predict the steady-state behavior of the converter, either in grid-tied or in islanding operation. To obtain soft switching on the converter, an active clamp circuit is introduced in [14], allowing a considerable reduction of the switching losses of the topology. Regarding the application of DC-DC converters based on a single input and multiple outputs, different approaches can be found in the literature [17, 18, 19, 20, 21, 22]. There are also approaches that use multiple winding transformers [23, 24, 25], although those with a single input and multiple outputs are the most frequent uses. The aims could be to supply several cascade-connected H-bridges to generate a multilevel AC output [17, 18], to connect the output in series to obtain a high DC voltage [19], or to supply independent loads with different voltage levels (depending on the number of turns of the secondary windings) [20, 21, 22]. For converters with multiple inputs and a single output, in [23], a two-input buck-boost converter is presented. One input receives power from the grid, whereas the other is connected to a PV array. The power of both inputs is combined to supply a resistive load. In [24], a DC-DC topology that can be supplied by independent DC sources is shown. The DC input voltages are converted into AC voltages by means of half-bridge inverters, then a multi-winding transformer transfers the power from all the primary inputs to the secondary output where another half-bridge converter transforms the AC voltage into DC voltage to finally supply a load.