Examinando por Materia "DC-DC power converters"

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    Efficiency Analysis of a Sliding-Mode Controlled Quadratic Boost Converter
    (IET Power Electronics, 2013-02-01) Lopez-Santos, Oswaldo; Martínez-Salamero, Luis; García, Germain; Valderrama-Blavi, Hugo; Mercuri, Daniel O.
    A quadratic boost converter with high DC gain to step up the voltage of a standard photovoltaic panel up to 400 V is analysed. First of all, a comparative analysis among boost, quadratic boost and cubic boost reveals that the quadratic boost exhibits the best trade-off between duty ratio range and converter efficiency. A hysteretic comparator is employed as a modulator to ensure the converter operation with high values of the duty ratio without risk of modulation saturation. A twoloop sliding-mode control is used to regulate the output voltage. An internal loop controls cycle by cycle the input current whose reference is established by an outer loop that processes the output voltage error by means of a proportional-integral compensating network. The measured results in a 100 W prototype operating in continuous conduction mode of average values, ripples, frequency and efficiency for different equilibrium points are in good agreement with the theoretical predictions.
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    Quadratic boost converter with low-output-voltage ripple
    (IET Power Electronics, 2020-06-17) López-Santos, Oswaldo; Mayo-Maldonado, Jonathan C.; Rosas-Caro, Julio C.; Valdez-Resendiz, Jesus E.; Zambrano-Prada, David A.; Ruiz-Martinez, Omar F.
    his study proposes a non-isolated quadratic boost converter (QBC) that features a low-output-voltage ripple with respect to traditional QBCs. This advantage is in contrast with other topologies that require a higher amount of stored energy by capacitors to achieve the same output-voltage ripple specification. This benefit permits to design a compact converter, since the size of capacitors is proportional to their energy storage rating. Moreover, the proposed transformerless topology is suitable for applications that require high-voltage gains as in the case of renewable energy applications. The main properties of the converter are corroborated as well as its advantages by providing mathematical models, analytical waveforms and experiments.