Tricky but Easy Electrical Engineering!
The main difference between latching and holding current of SCR is that latching current is related with turn on process while holding current is related with turn off process of SCR. Latching current of forward biased SCR is the minimum current which anode current must attain to continue to remain in forward conduction mode even … Read more
SCR Turn on methods are the techniques to bring an SCR in forward conduction mode from forward blocking mode. An SCR in forward conduction mode is characterized by low impedance, low voltage drop across anode & cathode and high anode current. The value of anode current is determined by the load. Thus it allows for … Read more
Definition of V-I Characteristics of SCR A V-I Characteristic of SCR (Silicon Controlled Rectifier) is the voltage current characteristics. The current through the SCR varies as the Anode to Cathode terminal voltage and Gate to Cathode terminal voltage is varied. The graphical representation of current through the SCR and voltage across the anode to cathode … Read more
Avalanche Breakdown is the process of current carrier multiplication due to collision of thermally generated minority carriers with crystal ions in a lightly doped reverse biased pn junction diode. An avalanche of current carriers is produced in a very short time due to this breakdown of pn junction diode. Holes in n side and electrons in … Read more
A pn junction diode is a two terminal single crystal semiconductor device whose one side is doped with acceptors and other side by donors. Doping with acceptor creates p type semiconductor while doping with donors produces n type. Thus a pn junction is formed in diode. The formation of pn junction in a single crystal … Read more
Definition Silicon Controlled Rectifier (SCR) is a solid state device used for power control in DC and AC system. An SCR is so called because silicon is used for its construction and its operation as a rectifier can be controlled. Silicon Controlled Rectifier is the oldest member of thyristor family. Thyristor is a family of … Read more
The main difference between Rectification Efficiency and Transformer Utilization Factor (TUF) is that former is measurement of efficiency of rectifier while latter is the measurement of extent to which transformer capacity is utilized. Rectification Efficiency is quantitative measurement of rectifier efficiency. It is ratio of DC power output to the AC power input of the … Read more
What is Freewheling Diode? A freewheeling diode is basically a diode connected across the inductive load terminals to prevent the development of high voltage across the switch. When the inductive circuit is switched off, this diode gives a short circuit path for the flow of inductor decay current and hence dissipation of stored energy in … Read more
Transformer Utilization Factor (TUF) is defined as the ratio of DC power output of a rectifier to the effective Transformer VA rating used in the same rectifier. Effective VA Rating of transformer is the average of primary and secondary VA rating of transformer. The formula for TUF can be written as below. Transformer utilization factor … Read more
The main difference between a Center Tapped and Bridge Rectifier is that one uses center tapped transformer while another do not require a center tapped transformer. Both these types are full wave rectifiers but their method of converting AC input into DC is different by employing different numbers of diodes. In center tapped full wave … Read more