An investigation of improvement of a pva sepic converter using an lcdd snubber

Abstract

newline The requirements of the various industries in different applications are to obtain newlinegreater efficiency, to operate the system for higher switching frequencies. Also, the losses newlinemust be as low as possible. For the household applications, the widely used device is newlineswitched mode power supply. Hence, to design the power electronics converter at greater newlineefficiency with the optimum or minimum cost, is a typical task for the household newlineapplications, industrial applications and commercial applications. newlineThis type of design is even more typical for that type of the applications in which newlinethe variable load voltage is required at low source voltage. Various modifications in direct newlinecurrent to direct current converters has been done and proposed for the above applications. newlineHence various modifications are introduced in the classical SEPIC converter which can be newlineused in the applications of the high step up purposes. For the various applications of the newlinehousehold applications, industrial applications and commercial applications, SEPIC newlineconverters are used widely, presently because they can be utilized for regulation and control newlineof the direct current to direct current conversion. Also, the working operation is flexible newlineand can be controlled easy for the power electronic converters. newlineSEPIC system is suitable for dc bus and battery charging applications. SEPIC gives newlinethe regulated output voltage in buck and boost both modes. It has non-inverting output and newlinecontinuous input current. Diode used in SEPIC limits the reverse flow of current. newlineContinuous conduction mode reduces the stress on components. To overcome the effect of newlineswitching losses, snubber circuits are used. The snubber circuits are classified into two newlinedifferent ways either active snubber circuit or passive snubber circuit generally which may newlinebe dissipative or non-dissipative in nature. newlineThe reduction of the change in current di/dt and the change in voltage dv/dt of the newlinepower semiconductor switch is achieved by adding up the dissipative passive snubber newline