performance specifications and acceptance testing for x-ray
... This method of exposure contacting is essential for mechanical type contactors, which, due to mechanical inertia, cannot be made to close precisely at a zero crossing of the primary voltage. The result is a step start with the kV maintained at a lower potential until the surge resistor is switched o ...
... This method of exposure contacting is essential for mechanical type contactors, which, due to mechanical inertia, cannot be made to close precisely at a zero crossing of the primary voltage. The result is a step start with the kV maintained at a lower potential until the surge resistor is switched o ...
1-Seyezhai- investigation of half-bridge llc resonant
... Abstract: This paper deals with the analysis and design of LLC resonant converter suited for photovoltaic applications. The proposed converter maximizes battery life without penalizing the volume of the charger. Theoretical values of turns ratio, resonant inductor, resonant capacitor, magnetizing in ...
... Abstract: This paper deals with the analysis and design of LLC resonant converter suited for photovoltaic applications. The proposed converter maximizes battery life without penalizing the volume of the charger. Theoretical values of turns ratio, resonant inductor, resonant capacitor, magnetizing in ...
Paper - CPES - Virginia Tech
... cope with this disadvantage, resonant converter with load independent output voltage characteristics is preferred to achieve good controllability [7,8]. The third challenge in omnidirectional WPT system design is how to decouple multiple transmitter coils from control point of view. In omnidirection ...
... cope with this disadvantage, resonant converter with load independent output voltage characteristics is preferred to achieve good controllability [7,8]. The third challenge in omnidirectional WPT system design is how to decouple multiple transmitter coils from control point of view. In omnidirection ...
Oscillator
... initial gain greater than 1 must be achieved. The back-to-back zener diode arrangement is one way of achieving this with additional resistor R3 in parallel. When dc is first applied the zeners appear as opens. This places R3 in series with R1, thus increasing the closed loop gain of the amplifier ...
... initial gain greater than 1 must be achieved. The back-to-back zener diode arrangement is one way of achieving this with additional resistor R3 in parallel. When dc is first applied the zeners appear as opens. This places R3 in series with R1, thus increasing the closed loop gain of the amplifier ...
llc resonant inverterfor solar pv applications
... The Resonant switching topology isone of the most efficient solutions for switch mode power supply Design (SMPS). LLC resonant converter in its halfbridge configuration gained more popularity than the other. High efficiency,High power density and high power are the major driving force for this resea ...
... The Resonant switching topology isone of the most efficient solutions for switch mode power supply Design (SMPS). LLC resonant converter in its halfbridge configuration gained more popularity than the other. High efficiency,High power density and high power are the major driving force for this resea ...
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron and traveling-wave tube (TWT), the magnetron cannot function as an amplifier, increasing the power of an applied microwave signal, it serves solely as an oscillator, generating a microwave signal from direct current power supplied to the tube.The first form of magnetron tube, the split-anode magnetron, was invented by Albert Hull in 1920, but it wasn't capable of high frequencies and was little used. Similar devices were experimented with by many teams through the 1920s and 30s. On November 27, 1935, Hans Erich Hollmann applied for a patent for the first multiple cavities magnetron, which he received on July 12, 1938, but the more stable klystron was preferred for most German radars during World War II. The cavity magnetron tube was later improved by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from their device made centimeter-band radar practical for the Allies of World War II, with shorter wavelength radars allowing detection of smaller objects from smaller antennas. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships.In the post-war era the magnetron became less widely used in the radar role. This was because the magnetron's output changes from pulse to pulse, both in frequency and phase. This makes the signal unsuitable for pulse-to-pulse comparisons, which is widely used for detecting and removing ""clutter"" from the radar display. The magnetron remains in use in some radars, but has become much more common as a low-cost microwave source for microwave ovens. In this form, approximately one billion magnetrons are in use today.