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An effective control solution for speed sensorless vector control of induction motor fed by a cascaded neutral point clamped (NPC) inverter is proposed, where the novel SPWM pulse rotation control approach provides a simple way to implement vector control for induction motor when the cascaded NPC inverter is employed. The single carrier is used in the novel pulse control, instead of the multi-carriers,...
Achieving faster dynamic response is one of the big challenges for the future microprocessor voltage regulators (VR). It is well known that the system bandwidth needs to be higher to get a faster dynamic response but the system bandwidth is usually limited by the phase shift near the switching frequency. In this paper, the existing theories for this phase shift and efforts to achieve a faster transient...
In this work a very simple structure for the implementation of a digital reconfigurable compensator based on specific hardware is presented. Its main advantages are the easy way to change the transfer function by changing the clock frequency of the compensator and the reduction of the required digital resources. This approach can be used in systems implementing capabilities such as autotuning, adaptation...
In this paper, a predictive non-linear voltage mode control method is introduced to enhance the transient performance of the VR. The proposed control method enables the VR to operate at a lower switching frequency in 250 KHz range for higher efficiency during steady state operation but respond fast accordingly to transient events when necessary. Compare to conventional method, the proposed control...
In this paper a control algorithm for battery charger from a solar panel is proposed. This approach takes advantage of the maximum solar radiation received on the solar panel in the early and late hours of the day, because the control algorithm provides the optimum programmed current to the battery in these hours. In order to study and quantify the benefits of maximum current of charge tracking, the...
This paper proposes an improved module integrated converter to increase energy capture in the photovoltaic (PV) series string. Prototypes for self-powered, high efficiency dc-dc converters that operate with autonomous control for tracking the maximum power of solar panels locally and on a fine scale are simulated, built and tested. The resulting module is a low-cost, reliable smart PV panel that operates...
Multilevel inverters have been widely used in medium and high voltage applications. Selective harmonics elimination for the staircase voltage waveform generated by multilevel inverters has been studied extensively in the last decade. Most published methods on this topic aimed at solving high-order multi-variable polynomial equation groups derived from Fourier series expansion. A totally different...
Harmonic Cancellation Technique (HCT) is a modulation technique which has been developed to reduce the output voltage THD of three phase voltage source inverters (VSI) when they are used to feed simultaneously both linear and non-liner loads. The HCT is based on the proper pre-distortion of the inverter output voltage in order to cancel out the low frequency harmonic content due to the non linear...
This paper presents different topologies of buck-boost converters with passive input networks that have alternative topologies; this is known in the literature as a Z-source inverter. Alternative passive networks were named by the authors as T-inverters; these improve output voltage regulation of the PWM inverters. T-inverter has fewer reactive components in comparison to conventional Z-source inverter...
A multiphase all-SiC dc/dc bidirectional converter for plug-in-hybrid electric vehicles (PHEV) is described in this paper that serves as a regulated charger for the intermediate high-voltage energy storage device (e.g. ultracapacitor) in the motoring mode and allows recharging of the batteries during regenerative mode. The primary focus of this paper is to describe the design of the converter and...
The development of Silicon-Carbide (SiC) power electronic devices having high operating temperatures, high breakdown voltages and low losses has been widely researched over the past few decades. While devices such as the SiC junction barrier Schottky (JBS) rectifier are becoming available in the commercial marketplace, the SiC DMOSFET is less mature. Although continued research on material processing...
MicroTCA, (uTCA) is an open standard for the implementation of telecom computing and data center systems. It is the largest specification effort in the history of the PCI Industrial Computer Manufacturers Group (PICMG), with more than 100 companies participating. Known as MicroTCAtrade (uTCA), the official specification designation is MTCA.0. This article will give an overview of the system, the components...
The ZVS-SVM controlled three-phase boost rectifier can realize ZVS operation for all switching devices. In this paper, the operation principal and design guideline are described in detail. The soft switching restriction is analyzed in particular. The experimental results of a 40 kW hardware prototype are presented to show the superiority of the topology and the reduction on loss.
Two techniques are presented to balance the filter capacitor voltages of a multi-pulse rectifier with active injection operating on a variable frequency supply. The active injector consists of a low-rated, bidirectional switch that modifies the behaviour of a 12-pulse rectifier at either low or high-frequency, resulting in 24-pulse or multi-level PWM operation respectively. The operation of the rectifier...
This paper proposes a novel implementation of an FPGA-Based controller for conducted-noise reduction in dc-dc converters. The switching noise produced by the converter has been reduced by randomly varying the switching frequency of the converter. Traditionally, the implementation of the switching-mode power supply (SMPS) has been accomplished using analog control circuits. However, the field-programmable...
Burst mode control is applied to improve light load efficiency of LLC converter in this paper. Detailed analysis on characteristic and operation processes of LLC burst mode control with SR is presented. Based on the analysis, some important rules of LLC burst mode control are proposed, which is the key to achieve high light load efficiency. The rules include: the suitable primary and secondary driving...
Unless over modulation is adopted, utilization of DC bus of the Modified Space Vector Modulation (MSVM) is a drawback that has severely limited the applicability of this modulation technique. This paper presents some solutions that, looking for a good compromise between increasing the use of DC bus and reducing common mode currents, allow to apply MSVM to most electrical drives on the market. Furthermore,...
A charge pump power factor correction (CPPFC) circuit for PT power converter has been proposed according to the circuit topology and the features of PT. The main contributions are as follows: 1) The principle of continuous input current CPPFC circuit and the unity power factor condition have been analyzed; 2) The design method has been put forward and the parameters have been calculated; 3) The Pspice...
A novel three-phase single-stage boost power factor correction (PFC) converter topology is presented. The converter operates in discontinuous conduction mode (DCM), and the PFC function is realized easily with the peak of input current following input voltage automatically which is the same as that of the traditional single switch three-phase boost PFC. Compared with the single switch three-phase...
This paper presents a new current control method for dual-boost power-factor-corrected (PFC) converters which avoids the need for sensing the ac input current. The control method is a generalization to the nonlinear average current control previously developed for boost PFC converters that has demonstrated better control performance and reduced sensitivity to noise. The generalized method for dual-boost...
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