Introduction to Power Electronic Converters

The field of Power Electronics mainly deals with the conversion of power from one form to another and the change from one voltage level to another by using different power electronic converters. There are many control strategies used in the converters to aid this conversion. Another important aspect of using power converters is conditioning. Conditioning … Read more

Buck Converter | Step Down Chopper

DC-DC converters are also known as Choppers. Here we will have a look at the Step Down Chopper or Buck converter which reduces the input DC voltage to a specified DC output voltage. A typical Buck converter is shown below. The input voltage source is connected to a controllable solid state device which operates as … Read more

Boost Converter | Step Up Chopper

DC-DC converters are also known as Choppers. Here we will have a look at the Step Up Chopper or Boost converter which increases the input DC voltage to a specified DC output voltage. A typical Boost converter is shown below. The input voltage source is connected to an inductor. The solid-state device which operates as … Read more

Buck Boost Converter

DC-DC converters are also known as Choppers. Here we will have a look at Buck Boost converter which can operate as a DC-DC Step-Down converter or a DC-DC Step-Up converter depending upon the duty cycle, D. A typical Buck-Boost converter is shown below. The input voltage source is connected to a solid state device. The … Read more

Chopper | DC to DC Converter

DC to DC converter is very much needed nowadays as many industrial applications are dependent upon DC voltage source. The performance of these applications will be improved if we use a variable DC supply. It will help to improve controllability of the equipments also. Examples of such applications are subway cars, trolley buses, battery operated … Read more

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 it. Now the question stands as, “what is power … Read more

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 … Read more

Switching or ON OFF Characteristics 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 … Read more

Rating of SCR or Thyristor

Thyristor ratings or SCR 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, turn … Read more

Thyristor Protection or SCR Protection

Protection of a device is an important aspect for its reliable and efficient operation. SCR is 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. There are different … Read more