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Questions and Answers
What is the purpose of the step-down transformer in a d.c. power supply?
What is the purpose of the step-down transformer in a d.c. power supply?
What is the function of the reservoir capacitor in a d.c. power supply?
What is the function of the reservoir capacitor in a d.c. power supply?
What role does the stabilizing circuit play in a d.c. power supply?
What role does the stabilizing circuit play in a d.c. power supply?
Which electronic component is often used as a reference in the stabilizing circuit of a d.c. power supply?
Which electronic component is often used as a reference in the stabilizing circuit of a d.c. power supply?
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What does the rectifier arrangement in a d.c. power supply do to the a.c. output from the transformer secondary?
What does the rectifier arrangement in a d.c. power supply do to the a.c. output from the transformer secondary?
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What is the primary function of conventional silicon rectifier diodes in a d.c. power supply?
What is the primary function of conventional silicon rectifier diodes in a d.c. power supply?
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What is the function of a half-wave rectifier circuit?
What is the function of a half-wave rectifier circuit?
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What happens during the negative half-cycle in a half-wave rectifier circuit?
What happens during the negative half-cycle in a half-wave rectifier circuit?
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What is the peak voltage applied to diode D1 in the half-wave rectifier circuit?
What is the peak voltage applied to diode D1 in the half-wave rectifier circuit?
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What is the function of the step-down transformer (T1) in the half-wave rectifier circuit?
What is the function of the step-down transformer (T1) in the half-wave rectifier circuit?
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Why are semiconductor diodes commonly used in rectifier circuits?
Why are semiconductor diodes commonly used in rectifier circuits?
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What is the frequency of the pulses of voltage developed across RL in the half-wave rectifier circuit?
What is the frequency of the pulses of voltage developed across RL in the half-wave rectifier circuit?
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What happens to the negative half-cycles in a half-wave rectifier circuit?
What happens to the negative half-cycles in a half-wave rectifier circuit?
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What is the role of diode D1 during each positive half-cycle in a half-wave rectifier circuit?
What is the role of diode D1 during each positive half-cycle in a half-wave rectifier circuit?
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What does the peak voltage across RL represent in a half-wave rectifier circuit?
What does the peak voltage across RL represent in a half-wave rectifier circuit?
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Why is it important to select a diode with consideration to its reverse bias in a rectifier application?
Why is it important to select a diode with consideration to its reverse bias in a rectifier application?
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Study Notes
Step-Down Transformer in D.C. Power Supply
- Reduces high voltage A.C. to a lower, manageable voltage suitable for further processing.
- Ensures safe operation of downstream components in the power supply.
Reservoir Capacitor Function
- Stores electrical energy, smoothing out voltage fluctuations.
- Provides a steady direct current output from the power supply by reducing ripple.
Stabilizing Circuit Role
- Maintains consistent voltage output despite variations in load or input voltage.
- Protects sensitive components from voltage spikes and fluctuations.
Reference Component in Stabilizing Circuit
- Zener diode is commonly used as a voltage reference due to its ability to maintain a stable voltage across it.
Rectifier Arrangement in D.C. Power Supply
- Converts A.C. output from the transformer secondary into pulsating D.C. current.
- Enables the power supply to deliver usable direct current to the load.
Function of Silicon Rectifier Diodes
- Allow current to flow in one direction, effectively blocking reverse current.
- Convert A.C. voltage into D.C. voltage in rectifier circuits.
Half-Wave Rectifier Circuit Function
- Generates D.C. output by only allowing one half of the A.C. signal to pass through.
- Provides a pulsating D.C. output, which can be smoothed with additional components.
Negative Half-Cycle in Half-Wave Rectifier
- The negative half-cycle is blocked by the diode, preventing current flow during this period.
- Results in the production of a unidirectional current.
Peak Voltage Applied to Diode D1
- The peak voltage is the maximum value of the A.C. input voltage that the diode experiences during the positive half-cycle.
Function of Step-Down Transformer (T1) in Half-Wave Circuit
- Reduces input A.C. voltage to a suitable level for the rectifier circuit.
- Enhances the efficiency of the rectification process.
Use of Semiconductor Diodes in Rectifier Circuits
- Highly efficient and reliable in converting A.C. to D.C. due to their low forward voltage drop.
- Widely available and cost-effective compared to vacuum tubes.
Frequency of Pulses in Half-Wave Rectifier Circuit
- The frequency of voltage pulses across the load (RL) is the same as the frequency of the input A.C. signal, typically at line frequency (50/60 Hz).
Treatment of Negative Half-Cycles in Half-Wave Rectifier
- Negative half-cycles are completely blocked, contributing no direct current to the output.
- This generates a pulsed D.C. output consisting only of positive half-cycles.
Role of Diode D1 during Positive Half-Cycle
- Conducts current and allows it to flow through the load (RL) during the positive half-cycle of the input A.C. signal.
- Enables the conversion of A.C. to D.C. output in the circuit.
Peak Voltage Across RL in Half-Wave Rectifier
- Represents the maximum D.C. voltage output available to the load.
- Critical for determining the power supply's capability and performance.
Importance of Diode Selection in Rectifier Applications
- Selection based on reverse bias ratings ensures diode reliability and prevents breakdown during negative voltage application.
- Ensures longevity and stability of the power supply circuit.
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Description
This quiz covers the block diagram of a d.c. power supply, including the step-down transformer, rectification using silicon rectifier diodes, and the smoothing and filtering process. It also involves the understanding of the output produced by these components.
