Summary
This work presents an alternating current–direct current (AC–DC) single‐switch quadratic single‐ended primary inductance converter (SEPIC) for applications involving light‐emitting diodes (LEDs). The proposed topology is basically composed of two cascaded SEPIC stages, where the first one provides input power factor correction (PFC) and the second one allows obtaining power control (PC) for dimming purposes. It is also capable of providing high step‐up or step‐down without requiring the use of extreme duty ratios. A detailed qualitative analysis is derived, from which it is possible to obtain a consistent design procedure. Experimental results from a laboratory prototype are thoroughly discussed aiming at validating the theoretical assumptions.
This work presents a non-isolated single-phase voltage-source inverter (VSI) topology using an autotransformer to provide an alternating current (AC) output voltage whose maximum peak value can be up to twice that obtained with the conventional half-bridge and full-bridge inverters. Prominent advantages include a simple structure with low component count, as well as the fact that both switches are connected to a same reference node, as there is no need for isolated driver circuitry. As a possible drawback, the maximum voltage across the switches is equal to twice the input voltage, but it is still reasonable to state that the topology is adequate for low-power, low-input-voltage applications. A thorough qualitative and quantitative analysis is presented, from which it is possible to derive a consistent design procedure. An experimental prototype with a rated power of 100 W, switching frequency of 20 kHz, direct current (DC) input voltage of 35 V, and rms output voltage of 37 V is developed to validate the theoretical assumptions.
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