1. How does SCR control voltage?
A Silicon Controlled Rectifier (SCR) is a solid-state component that regulates DC voltage by using a control circuit to determine when to "fire," thereby permitting the DC to flow through it. By increasing the voltage between the anode and cathode beyond the breakover voltage, an SCR can be triggered. Once the input control signal activates the SCR, the voltage at the anode becomes approximately one volt, and the SCR starts to conduct. SCRs find extensive usage in devices that necessitate the management of high power, often in combination with high voltage, such as power regulators and dimming lights.
2. Why SCR is called rectifier?
The SCR, or Silicon Controlled Rectifier, is a type of controlled rectifier that converts high AC current to DC current, effectively rectifying the current flow. Due to its unidirectional nature, the SCR can only conduct current in one direction, which makes it a suitable choice for medium- to high-voltage AC power control applications, such as power regulators, motor control, and lamp dimming. To activate the SCR, a positive current is required to enter the gate.
3. How SCR converts AC to DC?
The SCR, or Silicon Controlled Rectifier, is a useful device that can be utilized for converting AC voltage to DC voltage. By triggering the gate of the SCR at the 0° phase angle of the applied AC input voltage, it operates as a diode rectifier and conducts only when the anode to cathode voltage is positive. The power delivered to the load from the AC source can be controlled by applying alternate triggering pulses to the SCR. Rectifiers, such as the full bridge rectifier, can also be employed for AC to DC conversion. This conversion process is composed of four sub-steps, and the formula for converting AC to DC voltage is expressed in terms of RMS (root mean square) voltage.
