This paper Describes the design and simulate a single phase AC chopper module using IGBT as a power switch and designing and implementing the control circuit used to trigger the power switches. In this paper given that the difference between thyristor and IGBT. The reason for phase delay between main and freewheeling IGBT. In this paper control circuit is designed such that more related to the ...

Due to AC-power-grid frequency fluctuations, the designers for accelerator-based spallation-neutron facilities have worked to optimize the conflicting demands of accelerator and neutron chopper performance. For the first time, we are able to quantitatively access the tradeoffs between these two constraints and design or upgrade a facility to optimize total system performance using powerful new ...

The Centro Nazionale di Adroterapia Oncologica (CNAO) located in Pavia, Italy, will be the first Italian facility for hadrontherapy of deeply sited tumours [1]. The accelerator consists of a RFQ and of an IH-type drift tube linac, both delivered by GSI [2], followed by a synchrotron built by CNAO. In the low energy beam line (LEBT), an electrostatic chopper horizontally deflects the DC ion sour...

A new type of pulse chopper called an Einzel lens chopper is described. An Einzel lens placed immediately after an electron cyclotron resonance ion source is driven by high-voltage pulses generated by a newly developed solid-state Marx generator. A rectangular negative barrier pulse-voltage is controlled in time, and the barrier pulse is turned on only when a beam pulse is required. The results...

The South African Sugar Association Experiment Station, Agricultural Engineering Department conducted a series of semi-mechanised versus fully mechanised harvesting trials on a large commercial estate in Swaziland over the 1998/1999, 2000/2001 and 2001/2002 seasons. During the trials machinery performance was measured, differences in the quality of cane delivered to the factory were determined,...

To improve the performance of motor drives, there is a need to improve the quality and reliability of the drive system. With the high power handling capability of the switching device, pulse width modulated AC chopper can be used in high power applications. AC chopper using pulse width modulation provides substantial advantages over conventional line commutated AC controllers. To alleviate the ...

Abstract: A low-power and low-noise dynamic instrumentation amplifier (IA) for biopotential acquisition is presented. A dynamic IA that can reduce power consumption with a timely piecewise power-gating method, and noise level with an alternating input and chopper stabilization technique is fabricated with a 0.13-μm CMOS. Using the reconfigurable architecture of the IA, various combinations of t...

FIGURE 2. Traditional X-ray scattering experiment setup. Photo Credit: Argonne National Laboratory. In addition to the setup shown in Figure 2, time resolution at BioCARS is provided by precise synchronization of additional beam blocking equipment placed before the sample under test—two rotating disk choppers and a shutter [2]. The X-ray beam is intercepted by a watercooled heat load chopper wh...

A combination of rectifier and DC – DC chopper is useful in feeding DC loads where the DC input to the loads needs to be stepped up or down. Both rectifier and chopper are based on power electronic switches which inject harmonics in the system. This harmonics is an undesirable effect which should be mitigated effectively. For this, passive harmonic filters are used. Passive harmonic filters are...