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Current Limit Control of Chopper (CLC) Q. Explain time ratio control and current limit control chopper method for speed control of d.c. series motor. State any four advantages of chopper based D.C. drive. Q. Explain with waveforms the control techniques used for chopper control. In this strategy the chopper is turned on when the output … Read more

Constant Pulse Width Variable Frequency of Chopper (Frequency Modulation) Q. What is frequency modulation chopper control ? State two methods for this control. List out any two drawbacks of this method. Q. Explain with waveforms the control techniques used for chopper control. Working Principle of Constant Pulse Width Variable Frequency In this method the on time … Read more

Pulse Width Modulation (PWM) techniques for chopper or TRC Q. Explain time ratio control and current limit control chopper method for speed control of d.c. series motor. State any four advantages of chopper based D.C. drive. Q. List the control strategies used for chopper and explain TRC. Q. List the various control techniques used in chopper and … Read more

Control Strategies for Electrical Chopper Q. List the control strategies used for chopper and explain TRC. Q. State the working principle of chopper. State control techniques used for chopper. Q. List the various control techniques used in chopper and explain any one technique in detail. Q. State the application of chopper and list the various … Read more

Types of Choppers Q. Classify chopper based on output voltage and quadrants of operation. List any four applications of chopper. Q. Classify choppers based on quadrants of operation. Sketch only circuit diagram of each. Q. Classify choppers based on output voltage and quadrants of operation. List four applications of chopper. Q. State the classification of … Read more

Introduction of Chopper Q. Define chopper and list its applications (any three).  Q. Define chopper. Differentiate constant frequency control technique and variable frequency control technique principle. Q. State the working principle of chopper. State control techniques used for chopper. Q. State working principle of chopper. Describe the constant frequency system of control technique of chopper. … Read more

Field Controlled Thyristor (FCT) It is a new developed thyristor which is also called as field controlled diode (FCD) or bipolar static induction thyristor (BSITH). Similar to the conventional SCR, FCT also can block the RU current flow for both polarities of anode voltage and allows only forward current to flow. Basic structure of FCT … Read more

SOA of MOS Controlled Thyristor (MCT) Figure shows the SOA of the MCT. It is limited by the maximum controllable anode current, maximum power dissipation and the maximum temperature of the device. With increase in anode cathode voltage, we must decrease the maximum current (derating) due to power dissipation. We may not need a snubber for … Read more

Static (I-V) Characteristics of MOS Controller Thyristor (MCT) In the static condition, the I-V characteristics of the MCT are similar to those of SCR and GTO. Switching Characteristics of  MOS Controller Thyristor (MCT) MCT can change its state from ON to OFF or OFF to ON within 1 µsec. Figure (a) shows a switching circuit using … Read more

MOS Controlled Thyristor Precaution MCT works as a gate controlled device if its current is less than a value called peak controllable current. If we try to turn off the MCT when current through it is higher than its rated peak controllable current, then the MCT may get destroyed. Hence for higher values of currents, … Read more