Introduction of Industrial Applications of Power Devices The SCRs and Triacs are used in many of the industrial circuits. In this chapter we are going to discuss some of the industrial circuits using SCRs and Triacs.

Operation with Inductive Load in Cycloconverter In practice the load is never purely resistive. In case of the inductive loads, due to the energy stored by the load inductance, the conducting SCR continues to conduct in the next half cycle as explained in the AC to DC converters. Therefore as shown in the figure / table … Read more

Cycloconverter Q. What is cycloconverter ? Q. Explain cycloconverter with neat circuit diagram. Q. Power Electronics Cycloconverters Definition of Cycloconverter : A cycloconverter is an Ac to AC power converter which can produce a variable voltage variable frequency AC output from a fixed voltage, fixed frequency AC input. The word “cyclo” means frequency, so cycloconverter is basically … Read more

Single Phase Cycloconverter Q. What is cycloconverter ? Explain cycloconverter with neat circuit diagram. This is a single phase converter whose input and output are single phase ac. The input supply voltage at supply frequency (50 Hz) is converted into lower frequency ac output. There are two configurations of single phase cycloconverter : Centre tapped … Read more

Comparison of Circulating Current and Non-circulating Current Modes Sr. No With circulating Current Without circulating Current 1. Reactors are required to limit the circulating current. These reactors may be costly and bulky and consume lot of power. Reactors are not required for normal operation but sometimes may have to be used to make the load … Read more

Dual Converter with Circulating Current In this scheme both the converters are turned on simultaneously, the firing angles are adjusted by the control voltage VC in such a way that (α1 + α2) = 180°. The average voltage produced by both the converters will be same, but the instantaneous values will be different therefore circulating current will … Read more

Practical Dual Converter Q. Dual Converter Q. What is the use of dual converter? Q. What is dual convertor? Q. Single phase Dual converter If the firing angles of the two converters we controlled such that α1 + α2 = 180o 2and both the converters same average terminal voltage, which will be equal to operate simultaneously, then they will … Read more

Single Phase Dual Converter Circuit Diagram of Single Phase Dual Converter : The circuit diagram of a single phase dual converter is as shown in Figure A. As seen from the Figure A there are two single phase line commutated full converters connected back to back to drive a common load.  The load in this case … Read more

Ideal Dual Converter Q. What is ideal dual converter? Q. What is the essential condition for dual converter? An ideal dual converter consists of two ideal full converters. The ideal full converters are the ones which produce a pure ripple tree dc voltage at the outputs. Block Diagram of Ideal Dual Converter : The block diagram for … Read more

Four Quadrant Operation of Dual Converter Q. Dual Converter Q. Which converter is suitable for four quadrant operation? Q. What is meant by four quadrant operation? Q. How does a dual converter work? Q. Working Procedure of Dual Converter The first full converter is capable of operating in two quadrants depending on the value of firing angle α. For the … Read more