What is SCR and its VI characteristics?
The VI characteristics of SCR(silicon controlled rectifier) is a graph of anode current Ia on the y-axis and anode to cathode voltage on the x-axis as shown in the graph. The characteristics in the reverse direction (anode to cathode voltage negative) is similar to a reverse-biased diode.
What is SCR explain its characteristics?
A V-I Characteristic of SCR (Silicon Controlled Rectifier) is the voltage current characteristics. The current through the SCR varies as the Anode to Cathode terminal voltage and Gate to Cathode terminal voltage is varied.
What is IV characteristics of SCR?
Definition of IV characteristics of SCR As soon as the reverse breakdown takes place due to avalanche breakdown, a large current flows through SCR whereas the voltage across the device remains constant. It is dangerous to operate SCR in the reverse breakdown state because it may get damaged due to overheating.
How is SCR different from normal pn junction diode in term of construction and circuit symbol?
Silicon controlled rectifier is a unidirectional current controlling device. Just like a normal p-n junction diode, it allows electric current in only one direction and blocks electric current in another direction. A normal p-n junction diode is made of two semiconductor layers namely P-type and N-type.
What are VI characteristics?
V-I characteristics stand for voltage-current characteristics of an electrical component or device. Put simply; it is the graph between Voltage and Current obtained when current is measured through an electronic component as a voltage is applied across it.
What is the working principle of SCR?
The basic working principle in the SCR is that as the triggering or the biasing is applied at the terminal gate then the conduction begins. As it is a unidirectional device the current will be in a single direction.
What are the advantages of SCR over diode?
The SCR (silicon controlled rectifier) can handle large voltage, current and power. The Triggering circuit for silicon controlled rectifier (SCR) is simple. The SCR is easy to turn ON.
What is the importance of VI characteristics of Statcom?
Its prime function is to exchange dynamic reactive power with the host ac system. In distribution systems, STATCOM applications have been found in voltage regulation and stabilization, power factor control, voltage flicker compensation, and power-quality im- provement [15]. Fig. 1 shows V-I characteristics of STATCOM.
What are the VI characteristics of PN junction?
Volt-ampere (V-I) characteristics of a pn junction or semiconductor diode is the curve between voltage across the junction and the current through the circuit. Normally the voltage is taken along the x-axis and current along y-axis.
Where is SCR used?
SCRs are mainly used in devices where the control of high power, possibly at high voltage, is needed. The ability to switch large currents on and off makes the SCR suitable for use in medium to high-voltage AC power control applications, such as lamp dimming, regulators and motor control.
What is holding current in SCR characteristics?
Holding current of SCR or thyrsistor is that minimum value of current below which anode current must fall to come in OFF state. This means if the value of holding current is 5 mA, then anode current of SCR must become less than 5 mA to stop conducting. Figure below shows the V-I characteristics of SCR.
What are the V-I characteristics of varactor diode?
V-I Characteristics of Varactor Diode. By applying a reverse voltage across varactor diode, the width Wd of the depletion layer increases. Therefore, the capacitance of the junction decreases. On the other hand, if we reduce the reverse voltage across the varactor diode, the width Wd of the depletion layer decreases.
What are the vi characteristics of a SCR?
The VI characteristics of SCR (silicon controlled rectifier) is a graph of anode current Ia on the y-axis and anode to cathode voltage on the x-axis as shown in the graph. The characteristics in the reverse direction (anode to cathode voltage negative) is similar to a reverse-biased diode.
What’s the difference between a SCR and a diode?
The diode is made of two layers of P and N-type semiconductor material to form PN structure. The SCR is made of 4 alternating semiconductor layers to form a PNPN structure. A diode has two terminals: Anode and Cathode. SCR has three terminals: Anode, Cathode and Gate.
Can a varactor diode be used in reverse bias?
Varactor diode can only be operated in reverse bias. It acts like variable capacitance in reverse bias operation. Varactor Diode is also known as Tuning Diode, Variable Reactance Diode, Varicap Diode or variable capacitance diode.
