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Boost converters are widely used in the low-to-high DC/DC application and power-factor-corrected circuits. Based on the interleaved boost converter with coupled inductors, a converter consisting of four interleaved boost converter cells is proposed in this paper. The boost converter cells can share the input current, so this prototype circuit can be designed to have small input current ripple. And...
The cascade multilevel inverter output performance such as equivalent switch frequency, the number of output level and distribution of harmonic is relationship with carrier-shifted angle. So research on the relationship of cascade multilevel inverter with carrier-shifted mode will contribute to optimization design and improve its performance. Based on this, two different carrier-shifted modes of 1800/N...
A novel hybrid three-phase multilevel converter is proposed for medium-voltage applications. The converter employs a conventional three-phase voltage source inverter (VSI) linking series connected half-bridge modules at each phase. With the proposed connection, a large portion of energy can be processed by the VSI without the need for insulation or by employing a single transformer, while smaller...
This paper deals with a new topology based on single-phase Z-source AC/AC converter for voltage swells or sags compensation. The proposed system is able to compensate voltage swells. In addition, it is also able to compensate up to over 50% voltage sag. A commutation strategy to drive the AC/AC converter is employed to realize snubberless operation. Analysis is presented; Simulation and experimental...
This paper will present an improved cascade multilevel converter that is the series-connection of a diode-clamp converter and several H-bridge converters with equal dc bus voltage. According to this topology, a hybrid modulation method which incorporates square-wave synthesis in conjunction with unipolar triangle carried-based PWM method is illustrated. By the hybrid control scheme, higher voltage...
A pulse width modulation (PWM) controller chip for LED driver was presented in this paper. The controller features two major operation modes, current feedback mode and constant current mode, so as to applicable to almost all DC-DC converter topologies such like buck, boost, buck-boost, flyback and SEPIC. A special error amplifier, which is composed of two sub-modules and a mode selector, was introduced...
This paper investigates six three-leg single-phase to single-phase dc-link converters employing three-level and two-level legs. The pulse-width modulation techniques and a control technique that aims at maximizing the utilization of the DC-link voltage are presented. In addition, several relevant characteristics of the converter are addressed, such as voltage capability, harmonic distortion, shared-leg...
Use of multilevel inverters is becoming more popular in the recent years. Various topologies and modulation methods have been reported for utility and drive applications in the recent literature. Hybrid multilevel structures are the new multilevel inverter topologies where the cascaded series inverters have different internal DC bus voltages and/or modulated quite differently. This paper introduces...
Multilevel Static Compensators (StatComs) offer significant advantages over traditional two level converter based StatComs. The cascaded H-bridge topology for multilevel StatComs is increasing becoming the topology of choice. This paper will address the problem of compensating for the non-ideal nature of the H-bridges so that accurate current control can be achieved with this topology using a predictive...
Flying capacitor converter is an attractive multilevel converter choice due to its natural voltage balance property. Averaged voltage balance dynamics analytical research methods reported to date are essentially based on a frequency domain analysis. They require high mathematical skills and the solutions are not truly analytical and difficult to use in an everyday practice. In this paper, a straightforward...
Flying capacitor converter is an attractive choice due to its natural voltage balance property. Voltage balance dynamics analytical research methods reported to date are essentially based on a frequency domain analysis. They require high mathematical skills and the solutions are not truly analytical and difficult to use in an everyday practice. In this paper, a straightforward time domain approach...
Multi level inverters have been widely accepted for high power high voltage applications. Their performance is highly superior to conventional two level inverters in reduced harmonic distortion, lower EMI (electro magnetic interference) and higher DC link voltages. However it has some disadvantages as increased number of components, complicated PWM control method, and voltage balancing problem at...
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