Power Electronics

Definition: The devices that are designed to provide zero-voltage or zero-current switching are known as Resonant Converters. These converters are basically electric power converters that contain a network of inductors and capacitors that is specifically tuned to resonate at a particular frequency. In an electric circuit, resonant converters are incorporated to somewhat lessen the chances of switching losses in devices like MOSFET or IGBT. These are regarded as electrical inverters that work … [Read more...] about Resonant Converters

Definition: The circuits that are composed of semiconductor material and are designed to change constant alternating voltage directly to variable alternating voltage keeping the frequency unchanged. So, the frequency of the fixed as well as variable ac voltage will remain the same. It is sometimes also known as AC Regulators. These are basically phase-controlled devices, line commutated thyristors or triacs are used thus, the need for a complex commutation circuit does not exists … [Read more...] about AC Voltage Controllers

Definition: Static Circuit Breakers are circuits that are composed of semiconductor materials and are designed to break the continuously flowing current through a circuit. The interruption offered here exhibit quickness and reliability. More simply, it is a mechanical switching device that carries and interrupts current in case of normal circuit conditions along with some specified abnormal circuit conditions like a short circuit. Mainly static circuit breakers are classified into two … [Read more...] about Static Circuit Breakers

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