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This paper presents a novel power flow controller for wireless power transfer systems. The proposed method regulates the output voltage to a constant level by discharging the output filter capacitor when the voltage across the load is higher than a desired level. Unlike the traditional DC/DC topologies, the proposed controller doesn't require a bulky DC inductor which results in a compact system....
AC voltage regulators with or without a transformer review is provided. Several research directions by creation of new AC-AC converters are distinguished, such as voltage stabilization, voltage regulation to nominal values and also increasing of voltage with gain greater than unity, reactive power compensators, active filters, voltage dips and overvoltage compensators and soft start of electric motors...
A Recursive Ternary switched-capacitor (RT-SC) topology that achieves more than 3(3N-1)/2 ratios with N SC cells is presented. To achieve the high number of ratios for a wide output voltage range, a three-ratio (1/3, 1/2, 2/3) Series-Parallel (SP) topology is sliced into N reconfigurable three-ratio SP sub-cells that are interconnected in a series or stacked configuration in order to realize a minimum...
Conformance tests and requirements for the integrity of above-grade pad-mounted enclosures for application in coastal environments that contain apparatus energized in excess of 600 V and that may be exposed to the public are described. These include, but are not limited to,the following types of equipment enclosures: pad-mounted capacitors or inductors, pad-mounted distribution transformers, pad-mounted...
This paper provides an introduction to advanced power management and delivery techniques that have been employed in leading microprocessor designs. The techniques need multiple voltage rails supplied by independent voltage regulators. We provide justification for near-load regulators and explain the practical challenges associated with the regulator integration.
A voltage controller for the operation of three-phase single switch boost rectifier is proposed using low cost op-amps. The controller automatically adjusts the pulse width of the boost rectifier to maintain a constant dc load voltage of desired level, despite the variations in the load and source voltage. Methods have been proposed for calculating the duty ratio to obtain the desired dc load voltage...
Development of high frequency power electronic devices leads to high performance and flexible switch mode AC voltage stabilizers instead of traditional electromechanical types. This paper introduces a novel double stage topology for switch mode AC voltage regulators. The system produces a continuous adjustable isolated AC voltage providing a constant output voltage for sensitive loads. In order to...
In this paper a digital voltage-mode controller design methodology is proposed for the fourth order split inductor converter load voltage regulation. The salient features of the split-inductor converter are compared with the conventional SEPIC converter and then discrete-time mathematical models are established. Digital single-loop voltage-mode controller is designed using direct digital design approach...
In this paper digital voltage-mode controller design for a zero-voltage turn-on high gain boost converter is presented. Firstly, the converter steady-state performance is analyzed by using circuit theory principles. This analysis shown that this converter circuit exhibits five different modes of operations in one switching cycle and also results in zero-voltage transition to the switching devices...
In this paper modeling and control of a two-input boost type dc-dc converter is presented. Discrete-time models of the converter are established for trailing-edge modulation. Digital single-loop current and voltage-mode controllers are then designed based on these discrete-time models. The digital current controller keeps limit on the power drawn from the weak source, while the digital voltage mode...
A novel multi-channel LED driver is presented, consisting of an active current regulator and a switch mode voltage regulator for each channel. The active current regulator directly controls an LED current without any current sensing resistor and the switch-mode voltage regulator minimizes a voltage drop at the current regulator, independently for each channel. This is named self-optimization. This...
This paper establishes the fact that optimum value of firing angle for the thyristorized voltage controller fed induction motor at starting depends on motor parameters. Identically rated motors with different parameter values are considered for the work. Extensive simulations are carried out to obtain the optimum firing angle of the voltage controller, which gives zero negative torque pulsations with...
This paper discusses modeling of a micro-grid with PV-Wind-Diesel generator hybrid system and its operations. The PV system is modeled with a DC/AC inverter with a pre-defined Maximum Power Point Tracking (MPPT) control. Fixed speed induction generator based wind turbines are used to model the wind farm. The diesel generator controls are modeled with droop governor and automatic voltage regulator...
The Inter-Line Dynamic Voltage Restorer (IDVR) consists of several voltage source inverters connected to different independent distribution feeders with common dc bus. When one of the inverters compensates for voltage sag that appears in its feeder (voltage control mode), the other inverters pump the required power into the dc bus (power control mode). Each inverter will have both voltage and power...
Given the advantages of linear regulator techniques, low dropout regulator ICs are frequently used in portable consumer electronics. Only disadvantage in linear regulators, low efficiency, can be overcome by a very low frequency supercapacitor energy recovery technique to achieve efficiencies similar to common switching regulator techniques. This technique was successfully applied in a 12 V to 5 V...
An ac voltage regulating system of doubly Salient Electro-magnetic Generator has been performed in this paper. In order to maintain the high voltage 360VDC stable, the dual boost converter with fixed frequency PWM controlled is adopted. Three-phase dual buck inverter was adopted to output 115VAC/400Hz. the generating system configuration, control strategy of dual boost converter and three-phase dual...
This paper introduces an analysis and design of a digital controlled double loop voltage-current for a buck converter. Taking into account the implementation requirements, the chosen platform was an Field-Programmable Gate Array (FPGA). This paper also shows in detail the analog-digital interface. The study is completed by a detailed analysis of the FPGA programming including states machines and logic...
Supplying regulated voltage to critical loads is an important topic for several years. This paper presents a single-phase electronic voltage regulator based on high frequency switching of an isolated transformer where primary side voltage is controlled by two full-bridge converters sharing a common DC bus and operating at 50 Hz and 20 kHz switching frequencies. This allows 50 Hz induced voltage on...
Proportional integral derivative (PID) controllers are usually used to control DC-DC boost converters in PV systems. However, they have to be tuned based on certain defined operating range using averaged mathematical models. Loading conditions have great effect on PI controllers; PI controllers are subjected to failure under dramatic load changes. This limits the PI controller's operating range. Moreover,...
This work investigates power line communication (PLC) in a dc power management system comprising multiple point-of-load (POL) dc-dc converters. The communication, including a feed-forward signal from the central control unit (CCU) at the source end to the controller at the load end and a feedback signal from the load-end controller to CCU, is achieved by using the high-low voltage patterns of the...
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