Low-cost Control Circuit Research Articles

Single-stage three-phase boost power factor correction circuit for AC–DC converter

ABSTRACTThis article presents a single-stage three-phase power factor correction (PFC) circuit for AC-to-DC converter using a single-switch boost regulator, leading to improve the input power factor (PF), reducing the input current harmonics and decreasing the number of required active switches. A novel PFC control strategy which is characterised as a simple and low-cost control circuit was adopted, for achieving a good dynamic performance, unity input PF, and minimising the harmonic contents of the input current, at which it can be applied to low/medium power converters. A detailed analytical, simulation and experimental studies were therefore conducted. The effectiveness of the proposed controller algorithm is validated by the simulation results, which were carried out using MATLAB/SIMULINK environment. The proposed system is built and tested in the laboratory using DSP-DS1104 digital control board for an inductive load. The results revealed that the total harmonic distortion in the supply current was very low. Finally, a good agreement between simulation and experimental results was achieved.

Study of Direct Torque Controlled 3-phase SCIM with Two and Three-level Inverters using ST-DTC and FR-DTC scheme

DTC control strategy helps to obtain fast and smooth control in 3–phase induction motors. It does not depend upon the machine parameters and transformation of reference frames. Various control strategies on the Direct Torque Control (DTC) scheme have been carried out in the present study. The suggested scheme is meant for designing the low cost control circuit for DTC implementation on 3-phase SCIM. Three schemes with two types of inverters have been simulated in MATLAB (Simulink) environment and the THD ratio in each case has been studied along with Fast Fourier Transform (FFT) tools to compare the advantages.

Design and Control of the Dual-Axis Dynamic Simulator and its Application on the Remote Control and Virtual Reality

Virtual reality systems are not limited by place and space, and with convenience and safety features. Besides, since virtual scenes are of high plasticity, there is a wide range of applications in virtual reality systems, such as entertainment, simulation training…etc. In this study, roller coaster games let operators enjoy indoor roller coaster excitement and could not accept more users experience the pleasure of high-stimulation. The purpose of this study is to develop a dual-axis dynamic simulator and a new generation of the sport platform in the use of the low-cost control circuit board and the AC reversible motor. In addition, use the Bluetooth signal may be exempted from the complex system of wiring, and allows you to load device for wireless remote control and one to many large-scale systems show purposes. Also, the dynamic feedback mode of the feeling type is first used to render virtual reality, so the scene can be changed by the demands of the operator.

Current programmed control of a single-phase two-switch buck-boost power factor correction circuit

This paper presents a new current programmed control (CPC) technique for a cascaded two-switch buck-boost converter suitable as a low-cost power factor correction (PFC) rectifier in a variable speed motor drive. This new CPC technique, which is an extension of the conventional CPC method, enables the variable output dc voltage, and is therefore suitable in a pulse amplitude modulated (PAM) motor drive or as a universal input-power supply. The CPC method is very simple and requires only a constant-current reference without any changes in the transition between boost and buck operating mode, and the line current is practically unaffected by the topology-mode shift. Simulations and experimental results verify the presented control technique. Compliance with IEC-61000-3-2 class A is achieved. The experimental setup is based on a commercial CPC integrated circuit (IC) for dc-dc converters. This new control technique enables a simple low-cost control circuit for the two-switch buck-boost converter, which complies with IEC-61000-3-2, and the PFC circuit has inherent in-rush and overcurrent protection.

Simplified control technique for unity-power-factor boost pre-regulator

A simple implementation of the average-current-mode control technique for a single-phase boost power-factor pre-regulator is presented to give good line current correction. The controller avoids use of a multiplier, a sample-and-hold circuit, and a line voltage sensor. It provides an effective solution when a low-cost control circuit is required.

Single switch unity-power-factor dimmable fluorescent lamp ballast circuit

The authors propose an electronic ballast circuit which is capable of achieving high power factor, high efficiency, dimming control, and freedom from lamp flickering. All these features are accomplished with a single-switch power circuit, and a low-cost control circuit. Experimental results are given.