A technique for selecting the element values of the PWM AC chopper circuits to improve the input power factor is presented. This technique analyzes the phase angles of input current, output current and voltage for selecting the optimal value of the filter capacitance. This produces the phase angle of input current in phase with that of input voltage. Therefore, the PWM AC chopper can operate at...

To successfully follow a velocity profile, a motor and drive combination must generate enough torque to: accelerate the load inertia at the desired rates, and drive the load torque at the desired speeds. While the size of a bipolar stepper motor generally dictates the low speed torque, the ability of the drive electronics to force current through the windings of the motor dictates the high spee...

In chopper amplifiers, the interaction between input signal and clock can give rise to intermodulation distortion (IMD). This chopper-induced IMD is mainly due amplifier delay, which causes large pulses at output of amplifier’s chopper. article proposes use a so-called fill-in technique eliminate these pulses, thus resulting IMD, by multiplexing outputs two identical amplifiers that are chopped...

This study focuses on the loss of inductors in a multiphase bidirectional chopper, which is DC-DC conversion system. The current at chopper consists DC equivalent to load and an AC called ripple current. discussion regarding effect increased number phases should include due current, caused by semiconductor switching. Therefore, this clarifies from experiment with increase temperature. From extr...

In order to reduce the chopping power consumption of a flat hob chopper (referred herein as chopper) on premise ensuring effect chopper, mathematical model optimal design is established in this paper with minimum objective. With help MATLAB software, solved. The curves each point blade edge line before and after optimization structural parameters are generated. results indicate that when coordi...

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...