What is SCR regulator?
3000W Thyristor SCR Voltage Regulator is SCR Dimmer which can be used to control 220V Appliances. It can be used as light dimmer, fan speed controller, stove temperature controller. It is easy and simple to use and can control appliances up to 3000W!
What is an SCR in a circuit?
A silicon controlled rectifier or semiconductor controlled rectifier is a four-layer solid-state current-controlling device. SCRs are unidirectional devices (i.e. can conduct current only in one direction) as opposed to TRIACs, which are bidirectional (i.e. charge carriers can flow through them in either direction).
When SCR is on the voltage in the circuit is?
When conducting, the SCR acts like a closed switch. The voltage drop across the cathode and anode will be approximately 0.7–1.8 V, depending on the size of the SCR and how much current is flowing through it. When the cathode and anode are reverse biased, current will not flow through the device.
How SCR turn off?
To turn the SCR off, a positive pulse is applied to the base of Q, turning it on. The anode current is diverted to the transistor. When the anode current falls below the holding current, the SCR turns off. The transistor is held on just long enough to turn off the SCR.
How SCR is used as a switch?
This circuit consists of SCR which is triggered by zener diode arrangement. This zener diode is selected in such a way that under normal operating condition, it acts as an open switch. So, the voltage across the resistor is zero and hence the SCR remains in OFF state.
Why 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.
When SCR is turned off the current is the circuit is?
The main SCR with load resistance forms the power circuit while the diode D, inductor L and SCR2 forms the commutation circuit. When the supply voltage Vdc is applied, both SCRs are in OFF state and hence the capacitor voltage is zero.
How can SCR be commuted?
Natural Commutation As the current in the circuit goes through the natural zero, a reverse voltage is applied immediately across the SCR (due to the negative half cycle). These conditions turn OFF the SCR. This method of commutation is also called as Source Commutation or AC Line Commutation or Class F Commutation.