Power Electronics

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

Class B commutation of thyristor is another type of forced commutation technique that is used to turn off the SCR. In this commutation technique, the device gets turned off by building reverse current in a gradual manner from cathode to anode. Thus, is also referred to as current commutation or resonant pulse commutation. It is a forced type of self-commutation of SCR that makes use of resonating LC circuits. Basics of Commutation of Thyristor Previously we have discussed that unlike the … [Read more...] about Class B Commutation of Thyristor

Class A commutation of thyristor is a type of forced commutation and is also referred to as Load Commutation. It is one of the widely used commutation techniques that mainly find applications in high-frequency operations. Previously we have discussed that commutation of thyristor corresponds to turning the SCR off. Let us have a brief idea about- Commutation Techniques of Thyristor We have discussed thyristors that even after being in forward biased condition, the thyristor does not conduct … [Read more...] about Class A Commutation of Thyristor

The word commutation corresponds to an act of transferring current from one path to another. Thyristor Commutation refers to the process of turning the thyristor off. There are several ways utilizing which the thyristor gets commutated which is known as thyristor commutation techniques. We know that once a thyristor gets turned on after the application of gate pulse then even after the removal of gate pulse, current continues to flow through the device. This state is known as forward … [Read more...] about Thyristor Commutation Techniques

Thyristor or SCR is an intricated semiconductor device and so its protection during operation is quite an important aspect that is needed to be dealt with. For thyristors, it is generally said that the device operates in an efficient manner when the operation takes place under specified ratings. Here in this content, we will see in detail from which conditions thyristors are needed to be protected and the techniques adopted. But before that one must properly know the constructional feature of … [Read more...] about Thyristor Protection

Definition: A power diode or high-power diode is one of the power semiconductor devices that have two terminals (cathode and anode) similar to the normal PN junction diode but exhibit higher power handling capability. These are designed to handle several kiloamps of current in forward biased condition with negligible power loss and must block several kilovolts under reverse-biased state. More simply, we can say that power diodes are devices that are designed to carry a large amount of current … [Read more...] about Power Diodes

Types of SMPS or SMPS Topologies are the ways in which the various circuit configurations of switch mode power supply are classified. In broad sense, a switch mode power supply is categorized as, non-isolated SMPS and isolated SMPS. Here in this content, we will understand in detail the different types of SMPS. Before proceeding further, let us have a brief introduction of- What is SMPS? SMPS i.e., switch mode power supply is a power supply unit that is used to deliver the power from the … [Read more...] about Types of SMPS

Definition: SMPS, an acronym for Switch Mode Power Supply is a type of power supply unit that produces regulated dc output by using semiconductor switching techniques. Basically, here the regulated dc output signal is converted form of ac or dc unregulated input signal. It is sometimes also known as switched mode power supply or switching mode power supply. This power supply unit is designed to provide the energy to load from source by using switching devices. Before elaborating more on SMPS, … [Read more...] about Switch Mode Power Supply

Definition: Off-line UPS, sometimes called standby ups is equipment that offers uninterruptible power supply immediately to the connected device through the battery when detects electric supply failure within the circuit. An offline ups offers the most basic type of power protection to the appliances. Basically, in offline ups, ac power to the load is directly supplied from an ac source in normal condition. However, in case of a power outage, the inverter is used to supply ac power to the … [Read more...] about Off-line UPS