Power Electronics Lab
Showing 33–37 of 37 results
Thyristor Over Voltage Protection
Thyristor Over Voltage Protection SCRs can be employed for protecting other equipment from over-voltages owing to their fast switching action. The SCR employed for protection is connected in parallel with the load. Whenever the voltage exceeds a specified limit, the gate of the SCR will get energized and trigger the SCR. A large current will … Continue reading “Thyristor Over Voltage Protection”
Triac Phase Control
Triac Phase Control Features: Study of TRIAC characteristics and its operation in all the four modes i.e. I+, I-, III+ and III- Gate control of TRIAC with NPN transistor Gate control of TRIAC with PNP transistor Phase control with TRIAC and DIAC as pulse generator for gate trigger Light dimmer with TRIAC-hysteresis effect and its … Continue reading “Triac Phase Control”
UJT Trigger Circuits (Half-Full)
UJT Trigger Circuits (Half-Full) UJT Triggering There are various methods of triggering. Here we are going to see how the SCR can be triggered with the help of Resistor, resistor and capacitor, then by UJT (Uni-Junction Transistor). Triggering method vary with this and output waveform. FEATURES Consists of three types of basic firing circuit to … Continue reading “UJT Trigger Circuits (Half-Full)”
Universal Motor Speed Control
Universal Motor Speed Control Universal Motor Speed Control Apparatus is used to study the speed control of universal motor by two different methods namely speed control by using SCR and speed control by using TRIAC. The speed is varied by two variable potentiometer knobs provided on the board The apparatus is provided with universal motor … Continue reading “Universal Motor Speed Control”
Voltage Commutated Chopper
Voltage Commutated Chopper Experiments : Study of SCR Trigger Circuit for a Jones Chopper. Observe the output voltage with Motor Load. Observe the effect of ON Time Control on Output. FEATURES : Jones Chopper is a self-contained stand unit useful in the study and demonstration of the principle and working of a Voltage Commutated Chopper. It … Continue reading “Voltage Commutated Chopper”