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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

Definition: Voltage Source Inverter abbreviated as VSI is a type of inverter circuits that converts a dc input voltage into its ac equivalent at the output. It is also known as a voltage-fed inverter (VFI), the dc source at the input of which has small or negligible impedance. In a VSI, battery banks are considered to be the simplest form of dc voltage source which is a combination of multiple cells in series and parallel combinations. However, sometimes photovoltaic cells are also used as a … [Read more...] about Voltage Source Inverter

Definition: The word dual means two. Dual converters are defined as an antiparallel arrangement of two entirely controlled converters that operate in all four quadrants of the V-I plane. It is such a device that performs two simultaneous conversions. In a dual conversion system, the two converters out of which one acts as rectifier while another acts as inverter are connected to a common dc load. Thus is called so. What are Converters? A power electronic converter or simply a converter is … [Read more...] about Dual Converters

A sub-classification of forced commutation technique in which the main thyristor is commutated by application of reverse voltage along with the use of an auxiliary thyristor is known as Class D Commutation of Thyristor. As it uses reverse-biased voltage to turn the thyristor off it is also referred to as Voltage Commutation. Sometimes it is called parallel capacitor commutation and the reason for this is that here when the auxiliary thyristor is turned on then to turn off the main thyristor, … [Read more...] about Class D Commutation of Thyristor

A sub-classification of forced commutation in which the device is commutated by transferring the load current of the main thyristor to another thyristor in the circuit is Class C Commutation of the Thyristor. Another name for this type of commutation is complementary commutation. This commutation technique shows high reliability and suits operations at frequencies below 1000 Hz. What is Commutation of Thyristor? Commutation of Thyristor defines the process to turn the thyristor off. We have … [Read more...] about Class C Commutation of Thyristor