TWO TRANSISTOR ANALOGY OF SCR PDF

SCR can be used for different applications like rectification, regulation of power and inversion, etc. Like a diode, SCR is a unidirectional device that allows the current in one direction and opposes in another direction. SCR is a three terminal device; anode, cathode and gate as shown in figure. This results in varying the average power delivered at the load , by varying the ON periods of the SCR. It can handle several thousands of voltages and currents.

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It is a silicon based semiconductor device, which is used in electrical circuits for switching operation. SCR, whose full form is silicon controlled rectifier, is also a well known member of thyristor family.

Although there are many different members are available in thyristor family, but silicon controlled rectifiers are so widely used that as if thyristor and SCR become synonymous. The characteristic of thyristor consists of the characteristic of thyratron tube and characteristic of transistor.

In other words, it can be said, that the characteristic of thyristor is combination of characteristics of thyratron tube and transistor. That is why the name of thyristor consists of first four letters of thyratron tube and last five letters of transistor.

The device has ideal states, i. On and OFF. If we see from the constructional and operational point of view, it is a four layer PNPN three terminals Anode, Cathode, Gate semi controlled device. This device has tow states i. We can turn it ON by sending a gate current signal between second P layer and cathode.

But we cannot turn it OFF by control signal. That means we have control upon its turn ON, once it goes to conduction mode, we lose control over it. It can block both forward and reverse voltage but can conduct only in one direction. Schematic Diagram of Thyristor This is a pnpn thyristor. If we bisect it through the dotted line then we will get two transistors i.

Here is the explanation using two transistor model of SCR. At the first stage when we apply a gate current Ig, it acts as base current of T,2 transistor i. The value current then can only be controlled by external resistance of the circuit. Design with.

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Silicon Controlled Rectifier

It is a silicon based semiconductor device, which is used in electrical circuits for switching operation. SCR, whose full form is silicon controlled rectifier, is also a well known member of thyristor family. Although there are many different members are available in thyristor family, but silicon controlled rectifiers are so widely used that as if thyristor and SCR become synonymous. The characteristic of thyristor consists of the characteristic of thyratron tube and characteristic of transistor. In other words, it can be said, that the characteristic of thyristor is combination of characteristics of thyratron tube and transistor. That is why the name of thyristor consists of first four letters of thyratron tube and last five letters of transistor.

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Silicon Controlled Rectifier SCR | Two Transistor Model | Operating Principle

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