arduino program for single phase rectifier

The load voltage has a ripple, and the frequency of this ripple is 6 × 50 = 300 Hz.

Therefore each diode pair conducts for 60 o, and each diode conducts for 120 o.

Diode D6 sees the maximum negative voltage, but this remains true only up to 90 o when diode D2 takes over conduction from D6 and completes the path along with diode D1. If thyristor turns on late, less voltage will appear across the device and hence less power.While diode D1 conducts from 30 o to 150 o in the positive cycle, it is helped by the diode D6, which helps complete the path of return to the 3 phase source. So firing angle is basically a reference at which thyristor will turn on.Greater the firing angle, less will the voltage or power across the lamp as you can see in this picture.So output power across the lamp depends on the firing angle to the triac or thyristor.So the power across the lamp depends on the on time of thyristor which is ultimately depends on firing angle of thyristor.When thyristor is off, lamp will be off and when thryistor is on, lamp will also be on.At the output 220V AC lamp is used in series of ac power supply.Input to MOC3021 is firing pulse for thyristor which is used to turn on and turn off thyristor.MOC3021 is a optically isolated thyristor or triac driver.Variable resistor is used to adjust the firing angle of thyristor or triac.In this circuit diagram variable resistor is connected with analog channel zero of Arduino.Complete circuit diagram of adjustable firing angle control of thyristor using arduino is shown below.The output of zero crossing D2 will be fed to Arduino.Ĭircuit diagram of adjustable firing angle control of thyristor using arduino 4N25 optocoupler is used for isolation between high side voltage and low side voltage and it also helps to detect zero crossing. So zero crossing detector circuit is must to design adjustable firing angle control of thyristor using arduino. The length of triggering pulse should be same for both positive and negative half cycle. Because we want to control phase angle for both positive and negative half cycles. Zero crossing circuit is used to detect zero crossing of ac cycle after every half cycle. variable resistor : It is used to control firing angle time.Ĭircuit diagram of zero crossing detection circuit is shown below.Bride rectifier : It is used to convert negative half cycle to positive half cycle.Circuit diagram of adjustable firing angle control of thyristor using arduinoĬomponents used in adjustable firing angle control of thyristorįollowings are the main components used in this project.

Components used in adjustable firing angle control of thyristor.

Arduino program for single phase rectifier