With big projects implementation, such as space station and cargo spacecraft in orbit increasing the dosage of the secondary power supply, the requirement of increasing the for reliability, used in great quantities however on-orbit secondary power supply of power MosFET can only conservative derating...

A new 40kVA, 400V high-temperature superconducting (HTS) controllable reactor of transformer type has been designed, built and tested. The reactor has totally 3 windings and utilize Bi2223 HTS materials to wound the inside two windings which are responsible for the adjust of the reactor’s reactance....

The location and fine adjustment of the center frequency as well as the fine adjustment of power in a resonance loop remain a challenge in the field of voltage-controlled oscillator (VCO) design. Firstly, when the conditions of stable oscillation and the VOC with certain types of tuning bandwidth are...

This paper examines the reactive power control capability of doubly fed induction generator connecting to distribution grid with and without the inclusion of capacitor banks. The dynamic response characteristics of the wind power generator in the case of fault in the network to assure the secure and...

The zero crossing detection is essential in twelve sensors-less control using back-EMF. To increase output power of Brushless DC motor (BLDCM), traditional twelve step control has extended active angular period. It has drawback which become unstable the performance of the drive system in rated load condition...

In electric power steering (EPS), spoke type brushless ac (BLAC) motors offer distinct advantages over other electric motor types in terms torque smoothness, reliability and efficiency. This paper deals with the shape optimization of spoke type BLAC motor, in order to reduce cogging torque. This paper...

Recently Line Start Permanent Magnet Machine (LSPM) is a well-known motor due to its technical advantages in academic and industrial sector. The LSPM combines a permanent magnet rotor that allows higher motor efficiency during synchronous operation, and an induction motor squirrel cage rotor for starting...

The broadband performance of quarter wave plate circular polarizer based on FSS is presented for high frequencies applications. Currently, the transmission loss and broadband of circular polarizer at desired frequencies is important issue for high frequencies application. Here, we are introducing some...

Electric energy metering system consists of watt-hour meter, voltage transformer and current transformer. Hence, the error of electric energy metering system should be analyzed from the three parts. Aiming at the measurement accuracy of the power metering system under harmonics, the equivalent circuits...

The purpose of this paper is to improve low voltage ride through (LVRT) capability of doubly fed induction generator (DFIG).First, this paper gives expressions of the stator flux and rotor current during the grid fault occurrence and clearing by solving the mathematical model of DFIG. The results of...

The four leg shunt active power filter has strong ability of harmonic and neutral current compensation, and is especially suitable for three-phase four-wire system harmonic suppression. At present the single inductor filter is usually used in four leg shunt active power filter, but the single inductor...

This paper presents an improved high-gain amplifier circuit with low-frequency servo loop to remove DC offset and 1/f noise in UHF RFID receiver. Compared to AC coupling amplifier, the circuits can overcome DC saturation and reduce the distortion of the baseband signal in various data rate. Based on...

Autonomous Underwater Vehicle non-contact charging system using a separate structure?When the technology is used in the underwater environment, the inductive coupled power transmission system will produce a gap and eccentricity under the influence of the water shock, causing the coupling state changed,...

Based on front wheel steering vehicles, the ideal yaw rate model was constructed. Four-wheel (4W) steer-by-wire control model of two-degree-of-freedom (DOF) was taken as the study object, according to characteristics of vehicle constant speed and steady-state conditions, the zero sideslip angle and idea...

With the neutral-point-clamped (NPC) converter widely applied to direct-drive wind energy generation system, wheather to guarantee the dc-link neutral-point potential (NPP) balance has a crucial influence on the system. Research on grid-side NPC three-level converter, firstly, this paper established...

Thermoacoustic engine technology has been applied to convert heat energy into acoustic energy for the purpose of electricity generation. However, linear alternators are relatively expensive. Recently, SCORE (www.score.uk.com) has successfully developed 22.7 watts of electricity power using a Thermo-Acoustic...

We proposed a fluorescent micro-sphere with diameter of 6 µm was manipulated into a micro-tube with inner diameter of 6.2 µm. The Whispering Gallery Modes (WGMs) of fluorescence resonance were observed by 532nm laser pumping the micro-spheres-micro-tube system. Another micro-sphere with the same diameter...

STATCOMs are installed in Power grids all over the world with its powerful reactive power support and other various functions. The STATCOM simulation technology is also promoting greatly. FPGAs, as a newly processor, are considered in STATCOM simulation to realize the small time-step, which could increase...

On the base of reversible sequential circuits, this paper studies the Built-in self-test vector generation method, analyzes the method of LFSRs that generate pseudo-random sequences. Using reversible D Flip-Flops, we build a LFSR pseudo-random sequences generator to realize Built-in Self Test for reversible...

Among the micro-cladding integrated circuit-based manufacturing equipment, we use closed-loop control of the laser output control unit to precisely control the laser power and change the power of the laser beam. Equipment adopt galvanometer control card and AT89S52. Method of communication using RS232...

LC parallel resonance circuit, the equivalent impedance is purely resistive and the value of the maximum, by using this feature, the resonant circuit in the integrated operational amplifier feedback resistor position, can be at the resonant frequency to achieve specific signal of a frequency selection...

In this paper, a 1.9 GHz high efficiency power amplifier (PA) for wireless applications is present. The PA is a two stage class-F power amplifier. The drive stage is self-biased cascode structure and the output stage is common source. The PA is designed and simulated in 0.18 ?m silicon-on-insulator (SOI)...

In recent years, with the shortage of energy supply and tremendous of environmental pressure in China, the price of primary energy such as coal continues to rise, as well as the electricity price. However, the adjustable amplitude and frequency for residential electricity are lower than other industries....

In the Internet world, when people access to the information, they are also providing information to others. Therefore, how to find valuable information from the vast amounts of information in order to meet the user's needs, and how to find and enjoy the valuable information by the required users, have...

The design uses the electromagnetic sensor for measuring the speed of DC motor, using 89C52 SCM and Pulse Width Modulation(PWM) software design of the control system for speed control of DC motor for the ratio of air and by the LCD display circuit shows the value of speed, the drive to control the speed...