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A high efficiency, low profile and high step-up dc-dc converter is proposed for low dc voltage renewable energy system. Generally, the power source such as photovoltaic array and the fuel cell stack have low voltage output because of that a high voltage step-up converter is required to boost the voltage much higher than the voltage level for front-end application. The efficiency and voltage gain of...
Low power (5 W–25 W) automotive DC-DC converters have a very wide input voltage range from 4.5V to 42V, and it is usually operated at high switching frequency in order to comply with the strict CISPR-25 Standard for EMI performance. The conventional buck converter is currently employed for such applications owing to its simplicity and low cost, but it has low efficiency at high switching frequencies...
This paper provides a mathematical expression to determine the occurrence of soft-switching for a general topology of zero voltage transition (ZVT) converters with auxiliary resonant voltage source. This expression is used to help the designer in choosing appropriately the values of inductance and capacitance for the auxiliary resonant branch ensuring ZVT. The main advantage of the proposed methodology...
This paper presents a new type of Inductive Power Transfer (IPT) pickup which directly regulates power in AC form, hence producing a controllable high-frequency AC source. The pickup has significant advantages in terms of increased system efficiency, reduced pickup size and low production cost compared to traditional pickups that also produce a controlled AC output using complex AC-DC-AC conversion...
This paper describes a buck derived isolated DC/DC converter topology that includes a half-bridge of switching devices which are asymmetrically controlled so that the top and bottom switches are opened at mutually exclusive times. The center-tap of this half-bridge is connected to the primary winding of the isolation transformer along with a series connection of a small resonant inductor and half-bridge...
This paper presents a two-transformer active- clamping zero-voltage-switching (ZVS) flyback converter, which is mainly composed of two active-clamping flyback converters. [1]-[2] By utilizing two separate transformers[3], the proposed converter allows a low-profile design to be readily implemented while retaining the merits of a conventional single-transformer topology. The presented two-transformer...
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