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In normal operation of an SCR, gate is ________ w.r.t. cathode
- a)Positive
- b)Negative
- c)At zero potential
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
In normal operation of an SCR, gate is ________ w.r.t. cathodea)Positi...
When anode is positive w.r.t. cathode, the curve between V and I is called the forward characteristic.
If the supply voltage is increased from zero, a point is reached (point A) when the SCR starts conducting. Under this condition, the voltage across SCR suddenly drops as shown by dotted curve AB and most of supply voltage appears across the load resistance RL. If proper gate current is made to flow, SCR can close at much smaller supply voltage.
If the supply voltage is increased from zero, a point is reached (point A) when the SCR starts conducting. Under this condition, the voltage across SCR suddenly drops as shown by dotted curve AB and most of supply voltage appears across the load resistance RL. If proper gate current is made to flow, SCR can close at much smaller supply voltage.
Most Upvoted Answer
In normal operation of an SCR, gate is ________ w.r.t. cathodea)Positi...
Introduction:
In normal operation, an SCR (Silicon Controlled Rectifier) is a three-terminal semiconductor device that acts as a switch. It consists of a cathode, an anode, and a gate. The gate terminal is responsible for controlling the flow of current through the SCR. To understand the correct answer, let's discuss the behavior of the gate terminal in normal operation.
Explanation:
In normal operation, the gate terminal of an SCR is positive with respect to the cathode. This positive voltage is necessary to trigger the SCR into conduction.
Working Principle of an SCR:
The silicon-controlled rectifier (SCR) is a four-layer, three-junction, semiconductor device. It has three modes of operation: forward blocking mode, forward conduction mode, and reverse blocking mode.
1. Forward Blocking Mode:
- In this mode, the voltage applied between the anode and cathode terminals is below the forward breakover voltage (VBO) of the SCR.
- The SCR remains in the off state, and no current flows through it.
- The gate terminal is usually kept at zero potential during this mode.
2. Forward Conduction Mode:
- When the anode voltage exceeds the forward breakover voltage (VBO), the SCR enters the forward conduction mode.
- To trigger the SCR into conduction during this mode, a positive voltage pulse is applied to the gate terminal with respect to the cathode.
- This positive voltage on the gate terminal enables the SCR to start conducting current.
3. Reverse Blocking Mode:
- In this mode, a reverse voltage is applied between the anode and cathode terminals.
- The SCR blocks the flow of current in both directions, acting as a reverse-biased diode.
- The gate terminal is usually kept at zero potential during this mode.
Conclusion:
In normal operation, the gate terminal of an SCR is positive with respect to the cathode. This positive voltage is applied to trigger the SCR into conduction during the forward conduction mode. Keeping the gate terminal at a positive potential allows control over the SCR's conduction characteristics and helps regulate the flow of current through the device.
In normal operation, an SCR (Silicon Controlled Rectifier) is a three-terminal semiconductor device that acts as a switch. It consists of a cathode, an anode, and a gate. The gate terminal is responsible for controlling the flow of current through the SCR. To understand the correct answer, let's discuss the behavior of the gate terminal in normal operation.
Explanation:
In normal operation, the gate terminal of an SCR is positive with respect to the cathode. This positive voltage is necessary to trigger the SCR into conduction.
Working Principle of an SCR:
The silicon-controlled rectifier (SCR) is a four-layer, three-junction, semiconductor device. It has three modes of operation: forward blocking mode, forward conduction mode, and reverse blocking mode.
1. Forward Blocking Mode:
- In this mode, the voltage applied between the anode and cathode terminals is below the forward breakover voltage (VBO) of the SCR.
- The SCR remains in the off state, and no current flows through it.
- The gate terminal is usually kept at zero potential during this mode.
2. Forward Conduction Mode:
- When the anode voltage exceeds the forward breakover voltage (VBO), the SCR enters the forward conduction mode.
- To trigger the SCR into conduction during this mode, a positive voltage pulse is applied to the gate terminal with respect to the cathode.
- This positive voltage on the gate terminal enables the SCR to start conducting current.
3. Reverse Blocking Mode:
- In this mode, a reverse voltage is applied between the anode and cathode terminals.
- The SCR blocks the flow of current in both directions, acting as a reverse-biased diode.
- The gate terminal is usually kept at zero potential during this mode.
Conclusion:
In normal operation, the gate terminal of an SCR is positive with respect to the cathode. This positive voltage is applied to trigger the SCR into conduction during the forward conduction mode. Keeping the gate terminal at a positive potential allows control over the SCR's conduction characteristics and helps regulate the flow of current through the device.
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In normal operation of an SCR, gate is ________ w.r.t. cathodea)Positiveb)Negativec)At zero potentiald)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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