Types of Chopper

Chopper is a power electronic converter which converts fixed DC voltage to variable DC voltage. Chopper uses thyristors for power conversion. As thyristors can carry current in only one direction, by properly arranging the thyristors and diodes, four quadrant operation of chopper can be achieved. Types of chopper based on the quadrant of operation In

Effect of source inductance on the performance of phase controlled rectifier

In single phase fully controlled rectifiers, 2 thyristors conduct at any time. When the other two thyristors are triggered, the outgoing thyristors will turn off immediately. It is assumed that the incoming thyristors are turned on instantaneously and outgoing thyristors are turned off instantaneously. However, this is applicable only when the source does not have

Three phase Half controlled converter/ Semi-converter

Three phase half controlled converter is obtained by replacing 3 thyristors with 3 diodes in a fully controlled rectifier. Half controlled converter or semiconverter fed dc drives are used in industries which is a economical choice in some applications which does not require wide output voltage control like a fully controlled rectifier. Why half controlled

Single phase Half controlled converter/ Semi-converter

Single phase half controlled converter is obtained by replacing 2 thyristors with 2 diodes in a fully controlled rectifier. Half controlled converter or semiconverter fed dc drives a re used in industries which is a economical choice in some applications which does not require wide output voltage control like a fully controlled rectifier. Why half

Single phase fully controlled rectifier

Modes of operation The single phase full bridge converter can operate in two modes In both modes of operation (a)SCR should be forward biased and apply firing pulse to get turned on (b)Current through SCR always flows in the same direction ( A to K) For the single phase fully controlled rectifier feeding rle load

Phase controlled rectifier- full wave rectifier- part 1

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

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

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

Silicon Controlled Rectifier (SCR) V-I Characteristics

Silicon Controlled Rectifier Silicon Controlled Rectifier (SCR) belongs to thyristor family. The term thyristor refers to a family of semiconductor devices that are used for the power control in ac and dc systems. THYRISTOR = THYRatron + transISTOR . The construction of a thyristor is similar to that of a transistor but its characteristics resembles