This is the fastest interface due the Arduino library that is available in the MATLAB which can be used before downloading the program to the board. The interface between the converters and the Arduino has been established by using MATLAB-Simulink environment. This project presents the capability of Arduino for responding to the robust controller which has been applied to the 3 phase rectifier and 3 phase inverter. Understanding Robust Control on Arduino Microcontroller Testing in Power Electronics Converters (Completed)Ī bstract. I got the 12V AC (50Hz) using a step down transformer (220V to 12V). The 10k ohm potentiometer is used to control firing angle. I used the 10k ohm resistor as pull-up resistor for Arduino pin 2 because we’ve an open collector output (optocoupler 1). When the AC voltage is positive, optocoupler 1 is ON and therefore the collector pin is connected to ground. Optocoupler 1 collector pin is connected to Arduino pin 2 which is external interrupt pin, so optocoupler 1 interrupts the Arduino when there is a zero crossing event (when the AC signal goes from positive to negative). The optocouplers are used to isolate the Arduino (control circuit) from the power circuit.ĭiodes D1 and D2 are with the same type (1N4007), D1 is used to protect optocoupler 1 from reverse voltage and D2 to feed the SCR gate with positive current. In the circuit there are two optocouplers, I used optocoupler 1 to detect the zero crossing of the AC voltage signal and optocoupler 2 for firing the SCR. I used 100 ohm resistorĮxample circuit schematic diagram is shown below.Īll grounded terminals are connected together. The thyristor goes to the nonconducting condition (OFF state) when the load voltage and, consequently, the current try to reach a negative value. The load is resistive and therefore current id has the same waveform as the load voltage. In the figure below the angle ‘alpha’ is measured from the zero crossing point of the supply voltage Vs. Delaying the firing pulse by an angle ‘alpha’ does the control of the load voltage. The thyristor will conduct (ON state) when the voltage Vt is positive (Vt > 0) and a firing current pulse Ig is applied to the gate terminal. In single-phase half-wave rectifier, only one thyristor is used to control the load voltage. The gate terminal is used to control the SCR, the anode (A) and cathode (K) are connected in series with the load. The SCR (thyristor) is a three-terminal device (Anode, Cathode and Gate) with four layers of alternating p- and n-type material. This small topic shows how to build a simple single-phase half-wave controlled rectifier using an Arduino board and an SCR (Silicon Controlled Rectifier) or let’s say thyristor.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |