A new approach in design of sliding-mode voltage-controller for a SEPIC

A novel fixed‐time dynamic surface DC/DC SEPIC converter controller loaded by uncertain buck‐based constant power loads

“…[27] and SMC in ref. [29], about 20 and 40 ms, respectively. The main reason is that these controllers only confirm the asymptotical For a fair comparative study of the controllers in terms of quantity, some performance indexes including the mean square error (MSE), root mean square error (RMSE), and mean absolute error (MAE) are calculated to compare the performance of the proposed controller with two other control schemes.…”

“…Between DC/DC converters, the SEPIC converter provides both non-inverted output voltage and continuous input current by applying an inductor at the point of connection to the renewable energy source to regulate the input current and a capacitor at the output for regulating the output voltage. These converters also can scale the voltage level up or down to the desired value [29].…”

Sliding-mode controller for a step up-down battery charger with a single current sensor

“…Applying the Laplace transformation to (22), the Laplace representation IL1 of the closed-loop current in L1 is given in (23), where VR and Vdc are the Laplace representations of vR and vdc, respectively. 1257…”

“…Therefore, Fakham et al [17] was proposed a voltage control oriented (VOC) where the decomposition of direct and quadrature components allows to correct the power factor and avoid the total harmonic distortion, also controlling the DC voltage bus. Other non-linear controllers were proposed in the literature to provide a voltage regulation in battery chargers, such as fuzzy controllers [6], [19], [20] model predictive controllers (MPC) [21] and sliding mode controllers (SMC) [5], [15], [22]. In particular, the surface of the SMC used for battery chargers, based on high-order converters, frequently requires the measurement of two voltages and two currents to ensure bus stability in both charging and discharging modes, which is the case of the charger controller presented in [23].…”

“…Hence, buck-boost type converters are the best option to adapt to different voltage levels. Although some solutions have been proposed to address this problem, it is important to reduce the number of sensed currents, which reduces the complexity and cost of the control system, but it must be ensured that the regulation and dynamic behavior of the DC bus is not affected [22].…”