A dynamic voltage restorer (DVR) is developed to stabilize the three-phase load under sudden grid distortion conditions, including sag, swell and unbalance. The DVR composed of a DC\AC inverter DC-link capacitor regarded as energy storage element. When occurs, instant power compensate or absorb realized by resulted in degenerate stabilization performance poor transient quality load. Hence, cont...

Multi-level inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. In this paper, the most important topologies like diode-clamped inverter (neutral-point clamped), capacitorclamped (flying capacitor), and cascaded multi cell with separate dc sources. In this paper, we proposed a new multi-level inverter topology based o...

This paper proposes a novel active power decoupling circuit (APDC) based on modified Buck converter to reduce the DC-link voltage ripple of small capacitor motor drive systems. The APDC is placed between Boost PFC and DC-link, has two energy flow paths, sum equals output converter. With these configurations, can be precisely controlled same as AC component converter, thereby effectively reducin...

This paper presents an off-line integrated full ballast to supply a 35 W assembly of Power LEDs. The proposed solution integrates an input PFC stage (a flyback converter operating in DCM) and a DC-DC output converter (a buck converter) into a single switch power stage, operating with peak current control. As it will be shown, this control scheme maintains the current through the load constant, ...

line (90-265 Vac) applications with a hold-up time requirement. As shown in Chapter 5, the difficulty of these SPFC circuits to deal with a wide line range and long hold-up time requirement stems from the fact that the voltage of the energy-storage capacitor, VB, varies with the line voltage and load current. In most applications, with a proper design, VB(max) can be kept in the 400-420 Vdc ran...

Flexible characteristics, tunable parameters, and improved power density are the desired attributes that have led to widespread research on active capacitors inductors (ACI) in conversion systems. However, two-terminal realisation of ACI is challenging due different trade-offs between density, device stress, reliability added components. Moreover, requirement handling second-harmonic ripple mak...

The series capacitor buck converter is a dc-dc converter topology that uniquely merges a switched capacitor circuit and a multiphase buck converter. Many of the challenges faced by conventional buck converters are overcome by this converter topology. This enables efficient, high frequency operation and significantly smaller solution size. The series capacitor buck converter has beneficial chara...