Single phase controlled rectifier-part 1

In this article, we will see analyze the performance of single phase half wave controlled rectifiers. 1.Rectifier Rectifier is a power electronic converter which converts alternating quantity (voltage or current) into Direct Current quantity (voltage or current). A controlled rectifier converts a constant ac supply voltage to a variable dc voltage. To get a variable

Single phase uncontrolled rectifier- full wave diode rectifier

Half wave rectifier output voltage has more ripple content. Hence it is seldom used in real time applications. Full wave rectifiers produce two output pulses in every cycle of supply voltage and their output voltage has less ripple content compared to half wave rectifier. Full wave rectifiers have wide number of applications and are basically

Uncontrolled rectifier- Half wave diode rectifier- PART 2

Rectifier is an important topic in power electronics. In the previous article, we have seen about uncontrolled half wave rectifier feeding R load and L load. In this article, we will see about half wave diode rectifier supplying RL load and RE load. Further, the effect of freewheeling diode is analysed. 1. Half wave rectifier

Uncontrolled rectifier- Half wave diode rectifier- PART 1

Rectifier is an important topic in power electronics. In this article we will see about the classification of rectifiers and analyse the performance of each rectifier. Rectifier Applications of rectifier Classification of rectifier Single phase half wave rectifier HWR feeding R load Ripple factor Expression for average voltage Expression for rms voltage HWR feeding L

Power Bipolar Junction Transistor

A power transistor is a three-terminal device which is designed to operate at high voltage and current rating. The power transistors are basically controlled devices meaning they are turned on by applying a control signal and turned off when the control signal is removed. there are different types of power transistor which are listed below.

Triac

Triac is one of the bidirectional device used in the control of ac power. It is equivalent to two SCRs connected in anti parallel. As each SCR can conduct in one direction, it becomes a Bidirectional device. For two SCR, two heat sinks of slightly smaller size is required. But a Triac needs a single

Gate Turn Off Thyristor (GTO)

Silicon Controlled Rectifier (SCR) or Thyristor is extensively used in high power applications. The major limitation of SCR is that it is a semi-controlled device meaning it can be easily turned on while the turn off process depends on the circuit parameters. This is especially a problem when SCRs are used in DC circuits. Forced

SCR protection circuit/ Thyristor protection circuit

SCR is a very sensitive device and it needs protection circuit to avoid damage from over voltage and over current. In addition, the rate of change of voltage and rate of change of current could also affect the operation of SCR. So here, we will learn about some of the commonly used SCR Protection techniques

SCR turn on methods

When SCR is forward biased without gate current, it is said to be in forward blocking mode. The SCR can be made to switch from forward blocking mode to forward conduction mode by any one of the following methods. Forward Voltage Triggering Gate Triggering dv/dt Triggering Temperature Triggering Light Triggering 1.Forward Voltage Triggering In this

Two transistor model of thyristor / SCR

An SCR can be considered as two inter-connected transistors. This is done so as to analyse the operation of SCR and understand the reason behind the removal of gate pulse after SCR turns on. SCR is a four-layer semiconductor device with P-N-P-N structure.  The four- layer structure is split into two transistors namely a PNP