Based on the discovery of surge absorption capability supercapacitors, a transient protector named supercapacitor-assisted absorber (SCASA) was designed and implemented in commercial device. Despite its simplicity, circuit topology consisted coupled inductor wound around specially selected magnetic core. This paper elucidates design aspects SCASA coupled-inductor topologies with special focus a...

In 1982 Broniatowki [J. Appl. Phys. 56 (1982) 2907] estimated theoretically what is the change of capacitance as seen by a capacitance meter if an inductor is set in series with a DLTS sample. To the best of our knowledge, there have been no experimental studies on the inductor coupled in series with the sample to clarify in which way the inductor would actually change the DLTS spectra. In this...

The development of high-frequency power converters is continuously improving their density, efficiency and fast dynamic response. Among them, high-voltage-conversion-ratio (HVCR) dc–dc are widely used in high gain, i.e., step-up/-down or bidirectional applications, such as supply for data center, dc micro-grids, electrical vehicle charging systems, etc. In this article, the current main HVCR cl...

This paper summarizes recent research at the author’s laboratory into power management circuitry, including: (1) Envelope-tracking power supplies for base station power amplifiers, (2) Digital PWM generator circuitry, (3) Spreadspectrum clocking for EMI reduction in digitally-controlled power supplies, (4) High-efficiency coupled-inductor DC-DC converters with fast response and low ripple, and ...

The output voltage obtained from renewable energy sources is low and needs to be stepped up by and order of 20 for practical usage or grid integration.This emphasizes the need for high gain DC-DC converters. The proposed DC-DC converter topology combines the simple boost converter and a coupled inductor with voltage double stages to provide high voltage gain. The main advantages of this topolog...

We propose two chaotic circuits with hard nonlinearities coupled with an inductor and investigate some interesting phenomena in these systems. At first, we look into that several types of synchronization modes are stably excited. Next, we confirm that the synchronization modes are chaotically vibrated by observation of attractors and Poincare maps in the circuit systems. In particular, we aim t...

A tunable transformer-based Q-enhancement method for monolithic inductors used in parallel resonant LC tanks is presented. The Q of the inductor that forms the transformer primary is enhanced by cancelling the voltage drop across the series loss resistance of the primary with a voltage of opposite polarity that is induced by a current in the secondary. The circuit allows dc voltage control of Q...

A novel topology for a soft-switching buck dc– dc converter with a coupled inductor is proposed. The soft-switching buck converter has advantages over the traditional hardswitching converters. The most significant advantage is that it offers a lower switching loss. This converter operates under a zero-current switching condition at turn on and a zero-voltage switching condition at turn off. It ...