A flicker-free resonant LED driver with high power factor (PF) and passive current balancing is proposed analysed in this paper. The are composed a buck correction (PFC) unit dc-dc by sharing an active switch. Based on topology, the low output ripple can be achieved via small voltage bulk capacitor fast voltage-mode control loop. By charge balance for capacitor, of each string balanced. In half...

Air bubbles have been detected in human circulation of end-stage renal disease patients who are treated by hemodialysis. The consequence of air embolism, air bubbles, is under recognized and usually overlooked in daily practice. This paper shows results of a capacitor based detection method that capable of detecting the presence of air bubbles in the blood stream in different frequencies. The m...

The life of LED driver is mainly dependent on the component used in it. Elimination of electrolytic capacitor is done so that the life of LED driver will increase, if an ac-dc LED driver with power factor correction control is used than the output will be a pulsating current for driving the LED. Since the pulsating current will introduce light flicker that varies double the power line frequency...

The study of power management techniques has increased drastically within the last few years corresponding to the vast increase in the use of portable, handheld battery applications. These power management systems typically contain several LDO voltage regulators that require large external capacitors. The large external capacitors can not be fully integrated in standard CMOS technologies and hi...

Multilevel converters are mainly utilized to synthesize a desired singleor three-phase voltage waveform. The desired output voltage is obtained by combining several separate dc voltage sources. Solar cells, fuel cells, batteries, and ultracapacitors are the most common independent sources used. Multilevel converters have found wide applications in motor drives, static VAR compensators, and unin...

The increase of transmission frequency reveals more merits than lowor medium-frequency distribution among different kinds of power applications. Highfrequency inverter serves as source side in highfrequency ac (HFAC) power distribution system (PDS). However, it is complicated to obtain a highfrequency inverter with both simple circuit topology and straightforward modulation strategy. A novel sw...

This study proposes a novel bidirectional-switched-capacitor-based interleaved converter. In view of the shortcomings two well-known unidirectional-switched-capacitor-based converters, this improves such converters through combining structure switched capacitor circuit. The first effort was to overcome drawback Cockcroft–Walton-based converter, whose circuit impedance and ripple cause serious o...

Configurable clock is necessary for many applications such as digital communication systems, however, using the conventional direct digital frequency synthesizer (DDS) as a pulse or clock generator may cause jitter problems. People usually employ phase-interpolation approaches to generate a pulse or clock with correct time intervals. This work proposes a new phase-interpolation DDS scheme, whic...

Microbial Fuel Cells (MFCs) are bioreactors that convert chemical energy in organic compounds to electrical energy through the metabolism of microorganisms. Organic matters are widely available in the environment that contains a huge amount of energy. This energy could be harvested, converted, by the technology of MFCs, to be used in certain applications. Energy production of a MFC is limited i...

Various basic, efficient and cheap techniques are used for the purpose of life forecast and failure detection of aluminum electrolytic capacitors which are utilized as a part of many power electronic converters. The main idea of these techniques is to calculate the values of Equivalent Series Resistance (ESR) and Capacitance (C). Observing the ESR values, valuation of changes in voltage and cur...