Power Electronics

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

Definition: On-line UPS abbreviated as OUPS is a type of UPS that uses a combination of rectifier and inverter circuits in order to provide continuous power to the load from the supply source without any interruption. From continuous power here we mean that power is supplied to the load in case of availability from the source and power outage as well with zero transfer time. On-line UPS is sometimes also known as double-conversion system. The reason for calling it so because, within an online … [Read more...] about On-line UPS

Dielectric Heating is a process of electric heating by which the temperature of a dielectric (non-conducting) material is raised by the application of an alternating electric field (high voltage ac signal). The increase in temperature results in heating the substance which is in contact with the external field. Dielectric heating is sometimes called high frequency or radio-frequency heating, capacitive heating. This process allows uniform heating of non-metallic materials which are unable to … [Read more...] about Dielectric Heating

A small amount of dc or ac voltage is required to charge the battery. Thus, to charge any battery, suppose ac input is required then initially the input ac signal must be limited, then filtered for the removal of noise and regulated so that the voltage achieved after doing this can be used to charge the battery. However, not only this, after the battery gets fully charged, the circuit must get turned off so that no further unwanted charging takes place. A battery charger acts as a source … [Read more...] about Battery Charger Circuit using SCR

Thyristor Controlled Reactor abbreviated as TCR is a device used in power systems that offers fast reactive power and voltage limiting characteristics to the lightly loaded system. It majorly deals with controlling the temporary overvoltage condition and voltage collapse condition when there is an increase in transient stability and a decrease in system oscillations. A TCR typically has two inverse thyristors connected in parallel configuration along with a reactance in series with … [Read more...] about Thyristor Controlled Reactor

Parallel operation of thyristors deals with the requirement of parallelly connecting multiple thyristors, the operation of SCRs in a parallel configuration and the factors to be considered when multiple thyristors are to be included. Need for parallel connection of SCR We have already discussed while discussing the series operation of thyristor that presently available thyristor ratings are 10 kV and 3 kA for voltage and current respectively. But sometimes even such high values of individual … [Read more...] about Parallel Operation of Thyristor