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This paper presents an isolated high step-up forward/flyback active-clamp converter with output voltage lift. In order to obtain high step-up voltage gain, the output voltage lift is adopted. The characteristics of the output voltage lift are similar to the forward converter in the charging mode and the flyback converter in the discharging mode. The active-clamp circuit is employed to recycle the...
This paper presents flyback converter combined with single-capacitor turn-off snubber for auto-tuning fan rotational speed system. The proposed system can automatically regulate rotational speed of fan, depending on temperature in the chassis of the equipments. Its control algorithm is to regulate output voltage of the proposed converter. With this approach, the wear and tear of the bearing of fan...
In this work a linear field model is adopted to study the reliability of capacitors which are manufacturing in Win's production line. Two testing techniques, a constant voltage and a ramped voltage testing modes, are compared in order to examine in various sizes and shapes which testing techniques may give us a better way to predict the capacitor lifetime. It seems to us that the constant voltage...
Two MIM capacitors with capacitance density of 11 and 0.48 fF/um2 were fabricated simultaneously using IBM-s 0.13 um SiGe 8 WL BiCMOS process. Results from DC parametric measurement indicate that these two capacitors compliment each other extremely well.
This work presents a single-phase AC/DC step-down converter, which is composed of two power stages, buck-boost converter and buck converter. The front stage is used for a power-factor-correction (PFC) circuit and is operated in discontinuous conduction mode (DCM) by using the pulse-width modulation (PWM) technique to achieve almost unity power factor and low total harmonic distortion of input current...
Integration of low-cost and high performance passive capacitors into existing silicon CMOS technologies is essential for analog and radio frequency (RF) IC applications. Recently, BEOL vertical natural capacitors (VNCAP) with stacked via-comb structures have emerged as an attractive option due to their low-cost, high density, and highly symmetric configurations. In order to accurately predict low-k...
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