They have a small size as compared to thyristor. Thyristors are designed to handle high current surges. They are sensitive and cannot tolerate high surge current. They control high power having power ratings in kilowatts. They have low output power thus having low power ratings in watts. It is a latching device that momentarily needs a trigger pulse for operation. It is a current-controlled device that continuously relies on an input current signal. Transistor has comparatively low efficiency. The internal power losses are lower as compared to a transistor. The internal power losses are higher as compared to a thyristor. It has a high voltage drop as compared to the transistor. Transistor has a low voltage drop as compared to the thyristor. Its conduction cycle (power supplied) depends on the delay of the trigger pulse. The output current of the Transistor is proportional to its input current. It requires an extra turn-off circuit to stop conduction at command. It does not require any turn-off circuitry. The thyristor has a high turn-on and turn-off time. The transistor turns on and turns off immediately. It only needs a triggering pulse at the gate to start conduction. It requires a continuous gate signal in order to conduct. It has only one type based on its construction PNPN. It has two types based on its construction i.e. It cannot amplify any signal however it is only used for switching. It can be used for amplifying small signals as well as switching. The following comparison table shows some of the main differences between a transistor and a thyristor. Related Post: Thyristor and Silicon Controlled Rectifier (SCR) – Thyristors Applicationsĭifferences between Transistor & Thyristor.and they are bulkier in size as compared to a transistor. The Thyristors are used for managing and controlling the large power, therefore they are rated in Kilowatts. Thyristor or SCR is mainly used for controlled rectification and to control the power supplied to any load such as in lamp dimming, regulators and motor control. Since the thyristor does not stop conduction when the gate signal is removed, it needs extra circuitry to turn off the thyristor at command. After that, the SCR will need another trigger pulse to resume the current conduction. It will not stop conduction until the charge flow between anode and cathode stops. it only needs a trigger pulse for a moment to start conduction. There are 3 P-N junctions.Ī thyristor is a latching device i.e. The 3 terminals of thyristors are named Anode, Cathode and Gate. The following figure given below shows the structure and a symbolic representation of a thyristor. Where a thyratron is a gas filled tube device used for control rectifier and high power electrical switching applications. Good to Know: The word of Thyristor is derived from the combination of two words i.e. However, they are quite small in size as compared to the thyristor. Since they are only used for switching or small-signal amplification therefore they are designed for low power applications and are rated in Watts. Transistors are mainly used for magnifying or amplification of small signals such as in audio amplifiers and also used as switches etc. The transistor starts conduction when the Base-Emitter junction is in forward bias and the Collector-Base junction is in reverse bias. A transistor does not conduct in the absence of the gate signal. However, the gate signal is continuous and must not be removed during operation. If a transistor is properly biased (applying a gate signal), it will start conduction of majority carriers from one end to another. However, the collector is heavily doped as compared to the emitter. The Emitter and Collector are made from the same type of material. There are 2 p-n junctions in a transistor. The three terminals of a transistor are named Emitter, Collector and Base. The following figure given below shows the structure and a symbolic representation of a transistor.
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