IGBT Chopper Research Articles

Different Chopper Types for Supply Separately Excited DC Motor

Abstract Nowadays saving the planet’s resources plays a very important role in improving our life conditions. The purpose of the paper is to supply the separately excited dc motor by using different chopper circuits. A very sustainable solution is to replace the resistors from classic theory with dc choppers for better efficiency. The armature voltage can be controlled by using IGBT chopper and the PWM signal received from controller is done with a dedicated block created by MATLAB environment. The advantages of developing this technique are that the speed changes proportionally with armature voltage and inversely with field voltage by keeping field and armature voltage constant respectively. The chopper designed with IGBT and Diode modules offers good control at any frequency value and the speed, the armature current and electromagnetic torque of DC motor can be control. In this paper, different choppers had been simulating were working in four quadrants for supply an excited dc motor by using Matlab program.

Integrated voltage control and frequency regulation for stand-alone micro-hydro power plant

India has enormous potential of micro hydel plants with total power estimated upto 10000 MW from natural waterfalls and run-of-river schemes. Micro-hydro power plants provide electricity for remote rural communities. Majority of the micro grid systems are isolated from the grid and for ensuring the stability in voltage and frequency at varying loads require good control system. A novel approach with Synchronous Generator in Electronic Load Controller (ELC) is discussed here. ELC design is attempted using an uncontrolled bridge rectifier, an IGBT chopper which feeds a resistive dump load. Proposed ELC is simulated and results are presented.

Speed sensor‐less maximum power point tracking and constant output power operation of wind‐driven wound rotor induction generators

A simple control strategy has been proposed for maximum power point tracking (MPPT) mode and constant output power mode operation of variable speed wind turbine system employing wound rotor induction generators (WRIGs). The control strategy proposed in this paper has been implemented using TMS320LF2407A real time digital signal processor (DSP) and detailed procedure for such implementation is given. The salient feature of the proposed controller is that it employs only a single switch, which is an IGBT chopper and does not require any mechanical sensors or machine parameters. This makes the overall controller simple, flexible and robust. Further, space heating and battery loads are connected at rotor side of the machine through a diode bridge rectifier and the IGBT chopper. A method has been developed for the analysis of such grid connected WRIGs with variable external resistance at the chopper circuit. The successful working of the proposed controller has been amply demonstrated through extensive simulation and experimental results on the WRIG system for MPPT and constant output power operation.

Design of Dual DC Regulated Power Supply Based on MCU dsPIC30F3011

Traditional dual DC power supply used most of the linear power, which is lack of self-protection function, a high failure rate and the maintenance workload. To introduce a dual DC regulated power supply based on MCU design, the main circuit design using diodes to complete AC/DC conversion, and then through IGBT chopper adjustment, to achieve the DC/DC conversion outputs DC voltage. The control circuit uses dsPIC30F3011 as core, in accordance with the time optimal and PID control to achieve PWM regulation. Experiments results show that the design circuit has failed to self-protection and LCD display, in order to accurately and quickly repair the fault.

Measurement of the Paint Magnets for the Beam Painting Injection System in the J-PARC 3-GeV RCS

The beam painting injection system of the 3-GeV RCS in J-PARC, which realizes the uniform beam distributions in the ring, consists of four horizontal paint bump magnets and two vertical paint magnets. The power supply of the paint bump magnet is required to excite the current with high accuracy that varies from 17.6 kA to zero during 0.5 ms. The IGBT chopper units, a switching frequency of which is 50 kHz each, are multiply-connected to achieve the effective carrier frequency of 600 kHz. Accordingly, the output accuracy of the exciting current has been achieved to be less than 1.0%. The measurements of the magnetic field with the actual current waveform were performed and the good performance was confirmed.

Trapped field measurements of Gd-Ba-Cu-O bulk superconductor in controlled pulse field magnetizing

For large-scale electric power application of the melt-processed high temperature superconductor (HTS) bulks, especially at rotating machine, development of trapping much higher magnetic fields by using pulsed magnetization technique is essential. It is difficult to use static field cooling (FCM) technique that is most effective magnetizing method for the general industrial HTS applications, because the FCM requires large-scale superconducting magnets. Because the rise in temperature due to the magnetic flux motion decreases the pinning force, we controlled the magnetic flux penetrating to the bulk for the effective magnetization. A couple of vortex-type copper coils applied a magnetic field to a Gd-Ba-Cu-O bulk, which dimension was 45mm in diameter and 19 mm in thickness. HTS bulk was magnetized by the controlled pulse field without passive LCR pulse. We controlled waveform by using the discharge current that IGBT chopper in pulse magnetizer intermitted. We applied the pulse magnetic field with the various risetime to the HTS bulk in liquid nitrogen. The various conditions of the controlled waveform pulse to trap well-dressed profile magnetized the Gd-Ba-Cu-O bulk, strongly at 77K. In the present study, we show several properties which was measured in the PFM of the HTS bulk.

電池による大電流超伝導磁石電源

Since superconductors do not require voltages, a high-current power supply could run with low power if the voltage is sufficiently reduced. Even a battery-powered power supply could give as much as 2, 000A for a superconductor. To demonstrate this hypothesis, a battery-powered 2, 000A power supply was constructed. It uses an IGBT chopper and Schottky diode together with a specially arranged transformer to produce a high current with low voltage. Testing of 2, 000A operation was performed for about 1.5hr using 10 car batteries. Charging time for this operation was 8hr. Ramping control was smooth and caused no trouble. Although the IGBT frequency ripple of 16.6kHz was easily removed using a passive filter, spike noise remained in the output voltage. This ripple did not cause any trouble in operating a pancake-type inductive superconducting load.

Study on rotor igbt chopper control for induction motor drive

Rotor chopper control is a simple and effective drive method for induction motor. This paper presents a novel IGBT chopper topology, which can both adjust rotor resistance and protect IGBT efficiently. Investigation on the quasi-transient state of the rotor rectifying circuit is made, and a nonlinear mapping between the equivalent resistance and the duty cycle is deduced. Furthermore, the method for determining the magnitude of the external resistor is introduced.