Power Electronics

Synchronous Motors are the ones that are designed to operate or rotate at synchronous speed. Through Synchronous Motor Drives the various processes like starting, pull in, or braking of the synchronous motor becomes easy thereby allowing smooth operations. These are very much useful in variable-speed synchronous motor drives operating at high power. In general, the power rating of synchronous motor drives is about 100 MW and the voltage is maximized up to 13.8 kV. Introduction There are two … [Read more...] about Synchronous Motor Drives

Definition: DC Drives are the functional circuitry designed to regulate the speed of the dc motor by offering precise controlling to the same. For a dc drive control system, it is said that it facilitates starting, stopping along with changing the direction and speed of the motor. The major applications associated with dc motors are in adjustable-speed drives and position control applications. The speed controlling techniques for dc motors are quite simple and inexpensive in comparison to … [Read more...] about DC Drives

Definition: Electric Drives are electromechanical systems designed to control the motion of electrical machines. It is considered an important component of various industrial processes equipment as it helps in easy optimization of motion controlling. It is regarded as a complicated control system that controls the rotation shaft of the motor. A typical drive system has single or multiple electric motors along with a controlling system by which the rotation of the motor shaft is controlled. … [Read more...] about Electric Drives

The load-commutated choppers are the ones that use the principle of load commutation. Through load commutation, a thyristor in conducting state is driven into a non-conducting state by making the load current zero according to the nature of the load circuit parameters. It is one of the commutated chopper circuits other than voltage and current commutated chopper circuits. Introduction We know that choppers are known to be switches that are designed to perform turn-on and turn-off … [Read more...] about Load-Commutated Chopper

Definition: Current Commutated Chopper also known as Resonant-Pulse Commutated Chopper is a type of chopper that allows the thyristor to get commutated by the use of an oscillatory circuit. It is known to be a reliable commutation technique. Introduction We all have the basic idea that choppers are circuits that possess turn-on and turn-off mechanisms. Commutation corresponds to turning the thyristor off. Previously, we have seen that commutation can be of two types: 1. Forced … [Read more...] about Current-Commutated Chopper

Definition: Voltage-Commutated Chopper or Jones Chopper is a chopper circuit that commutates the thyristor by the application of a large reverse voltage across the thyristor. It is one of the earliest and simplest chopper circuits and is mainly used in high power circuits where load fluctuation is not a major concern. It is sometimes called parallel-capacitor turn-off chopper, or impulse commutated chopper. It is known to be an example of class D commutation of the … [Read more...] about Voltage-Commutated Chopper

Definition: Boost Converters sometimes, also known as step-up choppers are the type of chopper circuits that provides such an output voltage that is more than the supplied input voltage. In the case of boost converters, the dc to dc conversion takes place in a way that the circuit provides a high magnitude of output voltage than the magnitude of the supply input. It is given the name ‘boost’ because the obtained output voltage is higher than the input voltage. Introduction We have already … [Read more...] about Boost Converter

Definition: Buck Converter is a type of chopper circuit that is designed to perform step-down conversion of the applied dc input signal. In the case of buck converters, the fixed dc input signal is changed into another dc signal at the output which is of lower value. This means it is designed to produce a dc signal as its output that possesses a lower magnitude than the applied input. It is sometimes called Step-down DC to DC Converter or Step-down Chopper or Buck Regulator. Introduction We … [Read more...] about Buck Converter

Definition: The circuits that are designed to directly convert fixed dc voltage into adjustable dc voltage are called Chopper Circuits. It is also known as dc to dc converter or dc chopper. Choppers are considered to be dc equivalent to ac transformers, the reason for the same is that similar to the transformers, choppers hold the ability to step up or step down the fixed dc input voltage. It is known to be a static power electronics device built with an approach to increase or decrease the … [Read more...] about Chopper Circuit

Definition: Current Source Inverter is a type of inverter circuit that changes the dc current at its input into equivalent ac current. It is abbreviated as CSI and sometimes called a current fed inverter. Here the input provided to the circuit is a stiff dc current source rather than dc voltage source. In CSI, the input voltage is kept invariable and the amplitude of output voltage does not show dependency on load. But the waveform representation and the magnitude of the current flowing … [Read more...] about Current Source Inverter