Category: 3. Power Electronics

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.… Continue reading Thyristor Protection

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,… Continue reading Rating of SCR or Thyristor

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… Continue reading Switching or ON OFF Characteristics of SCR

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… Continue reading Two Transistor Model of SCR or Thyristor

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… Continue reading Thyristor : Concept of Power Electronics