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This paper presents distractive features of hysteresis voltage control for voltage source inverters. The features of the creation of the hysteresis voltage control systems for electric power systems are considered. The possibility of applying of hysteresis voltage control for multilevel voltage source inverters is evaluated. A simulation of a three-level three-phase voltage source inverter with hysteresis...
This work is devoted to the designing and development of an active output rectifier (AOR) integrated circuit (IC) for high-efficiency power supply units. IC is realized with the use of 250 nm BCD (Bipolar, CMOS, DMOS) mixed technology.
AC/DC switching power supply is widely used in various types of electronic equipment. In order to reduce the production cost and integrates multi-protection, a design based on off line flyback converter and 0.5µm CMOS process used in this paper. The chip works on constant current state achieved by pulse frequency modulation and constant voltage mode achieved by a unique off-time modulation method...
In this paper, we present a class-H audio amplifier with an H-bridged output stage. System efficiency is improved by producing a voltage envelope that tracks the input audio signal. The tracking envelope is realized by regulating a buck converter internally using voltage and current hysteresis control schemes. The H-bridged class-B output stage is designed to maximize the output swing across the speaker...
This paper presented an AC electronic load composed of an ac to dc PWM voltage source converter and provided a new control in closed loop, based on hysteresis current control. The hysteresis control can uses a symmetrical or an asymmetrical hysteresis band, in this paper, implementing of random band hysteresis band permits a good control for output current. This control is much less sensitive to parameter...
This manuscript proposes the effectiveness of active power line conditioning (APLC) system to deliver short circuit current whenever a shunt fault occurs at the load side. One may note that if the APLC system is able to deliver short circuit current then unnecessary interruption of main power supply could be eliminated. The developed APLC system is able to achieve balanced sinusoidal source currents...
This paper presents a power supply module (PSM) for SoCs (system on chip). This module, which is based on an improved LDO, has a wide input range and switchable power path. The proposed PSM can output a steady voltage of 6v as input voltage varies between 5.7 V-30 V, with a max error of 4.3%. It also provides a flexible power path. The SoCs will be supplied by either internal LDO or external power...
Polymorphic gates can be considered as a new reconfigurable technology capable of integrating logic functions with sensing in a single compact structure. Polymorphic gates whose logic function can be controlled by the level of the power supply voltage (Vdd) represent a special class of polymorphic gates. A new polymorphic NAND/NOR gate controlled by Vdd is presented. This gate was fabricated and utilized...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
The reason why the neutral point voltage fluctuates is analyzed in detail and a current-sensorless hysteresis control strategy proposed. This way to balance the neutral-point voltage is simple and not need of current sensor. Based on small signal control model and neutral-point voltage balanced technique the experimental prototype are given and the experimental results verify that the proposed mathematic...
This paper deals with the problem of the transmission of the energy to the dc trolley wire during the regenerative braking of the tram drive in case of the braking with increased dc-link voltage. The contribution presents new strategy called "active regenerative braking" (ARB). When the dc trolley wire is able to receive at least minimum energy, ARB allows the transmission of the vehicle...
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