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Direct torque control of induction motor is a kind of high performance of AC drive control method, the method of space vector analysis is the applied, The stator magnetic field, directly on the electromagnetic torque motor stator flux and control. But the change of the stator resistance will affect the performance of direct torque control system when the motor at the low speed This paper describes...
On the basis of the analysis of phase-shifted full-bridge ZVS PWM converter, Corresponding small-signal model is build using of state-space averaging method and the traditional Buck circuit model, Thereof, control block diagram of the system and transfer function are derived, Voltage single-loop control system is designed on the basis of small-signal model of phase-shifted full-bridge ZVS converter,...
In order to solve the problems in phase shifting full bridge ZVS PWM DC/DC converter basic structure like lagging bridge arm ZVS range is narrow, duty cycle losses as well as secondary rectification diode shutdown voltage peaking and oscillations and other problems, this article proposed one kind of original sideband clamp diode phase shifting full bridge ZVS DC/DC converter, has given the main circuit...
In this paper, the problems about work principle of the phase-shifted full-bridge ZVS DC / DC converter, the realization of soft-switching, the control of voltage-type single-loop are theoretically analyzed. It heavily analyzes the realization process of their soft-switching and the reason of related issues and solution, we establishes simulation model and simulates using matlab. Then the experiment...
In this study, the principle of a phase-shifted full-bridge zero voltage switching ZVS DC / DC converter is analyzed. It focuses on soft-switching implementation, selection of rectifier bridge,parasitic oscillation suppression, voltage-type single-loop control and other issues. The implementation scheme of full digital control based on TMS320LF2407 is given. Then the system's hardware and software...
Introduces full-digital variable frequency speed regulation (VFSR) system based on TMS320F2812 control, adopting SPWM technology convert 380V, 50Hz three-phase alternating current into 220V output variable-frequency alternating current. Under normal working condition, when load is changing, this frequency converter will automatically adjust the output voltage and frequency to maintain its function,...
This paper introduces the TMS320LF2407A chip and studies its application in variable frequency speed regulation system. This system uses main circuit of AC-DC-AC voltage type frequency conversion; adopts SVPWM technology; takes TMS320LF2407A as the main control chip; and uses IPM-PW100CVA120 to the main circuit of inverter. The full digital implementation and the experimental Waveform based on TMS320LF2407A...
This paper establishes the mathematical model of direct torque control (DTC) system of induction motor. Then a realization scheme of fully digitized direct torque control system is introduced with the DSP TMS320F2812 that works as the core control chip and IPM that works as main circuit. The control scheme obtains the switch control signal of inverter with the space voltage vector modulation technology...
In order to effectively resolve the real-time problems caused by a large number of calculations during carrying out the vector control of electrical motors, this paper analyzes the vector control theory of asynchronous motors based on the magnetic orientation of motor rotors, and its mathematical model is made. Then the variable frequency vector speed-adjusting experimental system is built with the...
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