Author: misamaliraza94
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Thyristor Protection
Protection of a device is an important aspect for its reliable and efficient operation. Silicon Controlled Rectifier (SCR) are a very delicate semiconductor device. So we have to use it in its specified ratings to get desired output. SCR may face different types of threats during its operation due to over voltages, over currents etc.…
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Rating of SCR or Thyristor
Thyristor ratings or SCR (Silicon Controlled Rectifier) ratings are very much required for operating it in a safe zone. The reliable operation can be done when a thyristor does not violate its voltage and current rating during working period. A thyristor, or SCR may have several ratings, such as voltage, current, power,,, turn on time,…
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Switching or ON OFF Characteristics of SCR
Turn ON Time of SCR A forward biased thyristor can be turned on by applying a positive voltage between gate and cathode terminal. But it takes some transition time to go from forward blocking mode to forward conduction mode. This transition time is called turn on time of SCR and it can be subdivided into…
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Two Transistor Model of SCR or Thyristor
Basic operating principle of SCR, can easily be understood by the two transistor model of SCR, as it is a combination of p and n layers. This is a pnpn thyristor. If we bisect it through the dotted line then we will get two transistors i.e. one pnp transistor with J1 and J2 junctions and…
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Thyristor : Concept of Power Electronics
Power electronics is one of the contemporary subjects of electrical engineering which has seen a lot of advancements in recent times and has impacted human life in almost every sphere. We over selves use so many power electronic applications in our daily life, without even realizing t. Now the question stands as, “what is power…
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Modulation : Q Factor
What is Q Factor? Q factor (also known as Quality Factor or Q-factor) is defined as a dimensionless parameter that describes the underdamped condition of an oscillator or resonator. The quality factor measures the performance of a coil, a capacitor, or an inductor in terms of its losses and resonator bandwidth. The definition of Quality…
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Network Topology
What is a Network Topology? A network topology is defined as the layout or arrangement of elements (usually nodes or links) in a communication network. Network topologies are used to define or describe the arrangement of various types of telecommunication networks – such as computer networks, command and control radio networks, and industrial field busses.…
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Active Low Pass Filter
What is an Active Filter? An active filter is a type of filter that includes one or more active circuit components such as a transistor or an operational amplifier (Op-Amp). They derive their energy from an external source of energy and use it to increase or amplify the signal output. Operational amplifiers can also be…
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Donor and Acceptor Impurities in Semiconductor
When we add a small quantity of impurity in a semiconductor than the impurity contributes either free electrons or holes to the semiconductor. As a result, the conducting property of semiconductor changes. The process of changing the conductive property of semiconductor by adding impurities is known as doping. Suppose, we add any pentavalent impurity in…
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Conductivity of Semiconductor
It is well known to us that the conductivity of a material depends on the concentration of free electrons in it. Good conductors consist large concentration of free electrons whereas insulators consist small concentration of free electrons. These conductors have a high conductance value (and hence a low resistance value). The concentration level of the…