PWM regulating controller is an important component of PWM type IGBT chopper. This paper introduces a PWM regulating controller designed by using microprocessor technology based on Intel80C196KC and the detailed solution of its hardware and software is given.
This text emphasized to study several kinds design method that drive electric circuit,passing to this several kinds design and research that drive electric circuit,for design a more outstanding PWM type of function switch power supply to provide the theories foundation.
Six harmonic suppression measures such as improvement of the power supper structure, increase of the rate of equivalent pulse wave for converters, adoption of a multipe circuit or a PWM type of inverted converters, etc, Which are to control the voltage sine wave distortion rate within the standard range, are discussed in this article so as to guarantee the safety and reliability of the electric network and its installations.
In this paper the structure and principle of a new kind of PWM type power supply for CO_2 laser are discussed in detail. Some parameters of the circuit are calculated.
Main power converter structure of the widely utilized diode-rectifier front-end-type PWM-VSI drive.
Various control strategies have been proposed in recent works on this type PWM converter.
A new compensative snubber is presented for eliminating the surge current and high frequency parasitic oscillation in rectified circuit of the PWM DC-DC converters. The output surge and noise voltages are de-creased over 4/5. The working principle of the sunbber is analyesd in detail, the designing formulas are derived. The theoretic analysis is consistent with the experimental results.
This paper puts forward a new idea of control valve, a digit-controlled proportional directional valve with input of PWM signal, which can be used in the condition of enomous inertia, colossal load and lower velocity to reduce hysteresis and crawling. The valve has a series advantages such as excellent aptipollution ability, tiny hysteresis and cheaper price and it can be controlled directly with computer.The pressure and flow rate of the valve and their pulsat ion magn itudes can be controlled by adjusting...
This paper puts forward a new idea of control valve, a digit-controlled proportional directional valve with input of PWM signal, which can be used in the condition of enomous inertia, colossal load and lower velocity to reduce hysteresis and crawling. The valve has a series advantages such as excellent aptipollution ability, tiny hysteresis and cheaper price and it can be controlled directly with computer.The pressure and flow rate of the valve and their pulsat ion magn itudes can be controlled by adjusting the duty cycle and the frequency of PWM signal. A mathematical model of the PWM digit-controlled proportional valve is set up and its theoritical analyses illustrated with experiment characteristic curves are displayed. Finally, the paper ends with the conclusion and the expeiimental charts of the static characterstics of the valve.
This paper discusses the basic principle which the inverted firing angle of thyristor inverter has the influence on power factor of a cascade connected device. On the basis of this principle, if it adopts a PWM type of cascade connected device, the power factor is improved to a certain extent. The tested results fully prove that the thcoritical analysis is correct.Because the construction and control of this PWM type of cascade connected device are comparatively simple and the economic benefit by using of this...
This paper discusses the basic principle which the inverted firing angle of thyristor inverter has the influence on power factor of a cascade connected device. On the basis of this principle, if it adopts a PWM type of cascade connected device, the power factor is improved to a certain extent. The tested results fully prove that the thcoritical analysis is correct.Because the construction and control of this PWM type of cascade connected device are comparatively simple and the economic benefit by using of this device is got.
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