Cara Kerja SCR - Beserta Analisis Rangkaiannya

Summary

In this video, the instructor explains the functionality of an SCR (Silicon Control Rectifier), a key component in electronics. The SCR, part of the thyristor family, behaves like a diode with an additional control terminal, known as the gate, which triggers current flow from anode to cathode. Once triggered, the SCR remains on, unlike a transistor that requires continuous input to stay on. The video compares the SCR to an NPN transistor, highlights its unique latch-on feature, and demonstrates a practical circuit example. Viewers will gain an understanding of SCR's role in controlling power flow and its application in switching circuits.

Takeaways

• 😀 SCR (Silicon Control Rectifier) is a type of thyristor, resembling a diode but with an additional gate terminal that allows for current control.
• 😀 The SCR has three terminals: Anode, Cathode, and Gate, with current flowing from Anode to Cathode when the Gate is triggered.
• 😀 The SCR behaves similarly to a transistor, where triggering the Gate allows current to flow between Anode and Cathode.
• 😀 Unlike a transistor, once the SCR is triggered, it continues conducting even if the Gate trigger is removed, until the voltage drops below a certain threshold.
• 😀 An SCR remains 'on' even if the Gate signal is removed, which is a key difference from transistors where current stops when the Gate signal is removed.
• 😀 The SCR is often compared to a transistor in terms of its operation, but its ability to continue conducting after the trigger signal is removed is a significant difference.
• 😀 In the video, an example of controlling an LED with an SCR circuit is given, demonstrating the SCR's ability to keep the circuit closed after being triggered.
• 😀 The SCR can be used to control power in a circuit by allowing current flow only when triggered, and turning it off when the trigger is removed and the voltage drops.
• 😀 A simple SCR circuit can be built with components like a resistor, switch, and LED, where pressing the switch triggers the SCR, allowing current to flow and lighting the LED.
• 😀 To turn off the SCR and stop current flow, the switch needs to be opened, causing the voltage to drop and the SCR to turn off automatically.
• 😀 The working principle of the SCR is essential for applications like power control, where the SCR acts as a controlled rectifier that allows or blocks current based on the gate trigger.

Q & A

What is an SCR and what is its purpose in electronics?

An SCR (Silicon Controlled Rectifier) is a component in the thyristor family. It functions to control the flow of current between two points, acting like a switch that allows current to flow from anode to cathode when triggered by a small voltage applied to its gate.

How does the SCR differ from a regular transistor?

The main difference is that SCR, once triggered, continues to allow current flow even if the triggering voltage is removed, unlike a transistor, which stops conducting when the base voltage is removed.

What is the function of the gate in an SCR?

The gate of an SCR is used to trigger the device. When a small voltage is applied to the gate, it allows current to flow from the anode to the cathode, essentially turning the SCR on.

What happens if the gate voltage is removed from the SCR?

Once the SCR is triggered and current is flowing, the gate voltage can be removed, but current will still flow through the SCR until the external circuit is interrupted.

What are the three terminals of an SCR?

The three terminals of an SCR are the anode, cathode, and gate. The anode and cathode are the main terminals for current flow, while the gate is used to control the switching action.

Can you compare the SCR's behavior to an NPN transistor?

An SCR behaves similarly to an NPN transistor in that it controls the current flow, but the key difference is that the SCR remains on even after the gate voltage is removed, whereas the transistor stops conducting when the base voltage is removed.

What happens when the SCR is triggered by a voltage at its gate?

When a voltage is applied to the gate, it initiates current flow from the anode to the cathode, effectively closing the circuit and allowing current to pass through.

How is the SCR turned off after being triggered?

The SCR is turned off by interrupting the current flow in the external circuit, for example by opening a switch. Once the current drops to zero, the SCR will turn off automatically.

Why is a resistor used in the SCR circuit?

A resistor is used to limit the current and protect components from excessive current flow, ensuring that the SCR and other components operate within their safe limits.

What is the role of the switch in the SCR circuit?

The switch in the SCR circuit allows or interrupts current flow. When the switch is closed, current can flow and the SCR is triggered, but when the switch is opened, the current flow is interrupted, turning the SCR off.