DC Regulated Power Supply Block Diagram Quiz and Flashcards

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Questions and Answers

What is the purpose of the step-down transformer in a d.c. power supply?

To store charge in a capacitor

To stabilize the output voltage

To rectify the output from the transformer

To convert high voltage mains input to low voltage (correct)

What type of output does the rectifier produce in a d.c. power supply?

Unsmoothed or pulsating d.c. (correct)

Alternating current

Constant voltage

Smoothed d.c.

What is the role of the high-value reservoir capacitor in a d.c. power supply?

To stabilize the output voltage

To rectify the output from the transformer

To store charge and smooth out voltage pulses (correct)

To convert high voltage to low voltage

What component provides a constant output voltage in a d.c. power supply?

Stabilizing circuit Signup and view all the answers

What is the function of the zener diode in a d.c. power supply?

To provide a voltage reference for the stabilizing circuit Signup and view all the answers

Which electronic component stores a considerable amount of charge in a d.c. power supply?

High-value reservoir capacitor Signup and view all the answers

What is the function of a rectifier in a DC power supply?

To convert alternating current (a.c.) to direct current (d.c.) Signup and view all the answers

What type of rectifier circuit makes use of only either positive or negative half-cycles of the supply?

Half-wave rectifier Signup and view all the answers

What is the role of diode D1 in the half-wave rectifier circuit?

To allow current to flow in one direction only Signup and view all the answers

What is the main difference between the positive and negative half-cycles in a half-wave rectifier circuit?

The diode is forward-biased during the positive half-cycle and reverse-biased during the negative half-cycle Signup and view all the answers

What is the peak voltage applied to diode D1 in the half-wave rectifier circuit?

$17 V$ Signup and view all the answers

What is the purpose of the load resistor (RL) in the half-wave rectifier circuit?

To develop the output voltage across it Signup and view all the answers

What happens to the negative half-cycles in a half-wave rectifier circuit?

They are blocked by the diode Signup and view all the answers

What is an important consideration when selecting a diode for a particular application in a half-wave rectifier circuit?

The voltage drop across the diode during positive half-cycle Signup and view all the answers

What is the peak amplitude of the positive half-cycle pulses across RL produced by the half-wave rectifier circuit?

$16.3 V$ Signup and view all the answers

What component is used to convert alternating current (a.c.) to direct current (d.c.) in a DC power supply?

Diode Signup and view all the answers

Study Notes

DC Power Supply Components and Functions

The step-down transformer in a DC power supply reduces the voltage of the alternating current (AC) input to a lower voltage.

Rectifier Functions

The rectifier produces a pulsating DC output.
A half-wave rectifier circuit makes use of only either positive or negative half-cycles of the supply.
Diode D1 in the half-wave rectifier circuit conducts during the positive half-cycle and blocks during the negative half-cycle.
The main difference between the positive and negative half-cycles in a half-wave rectifier circuit is that the diode conducts in one and blocks in the other.

Capacitor Functions

The high-value reservoir capacitor stores a considerable amount of charge in a DC power supply.

Voltage Regulation

A component such as a voltage regulator provides a constant output voltage in a DC power supply.
The zener diode is used to regulate the output voltage.

Rectifier Circuits

The purpose of the load resistor (RL) in the half-wave rectifier circuit is to provide a path for the current to flow.
The negative half-cycles in a half-wave rectifier circuit are blocked by the diode.
An important consideration when selecting a diode for a particular application in a half-wave rectifier circuit is its ability to handle the required voltage and current.
The peak amplitude of the positive half-cycle pulses across RL produced by the half-wave rectifier circuit is equal to the peak voltage applied to diode D1.

AC to DC Conversion

The rectifier is the component used to convert alternating current (AC) to direct current (DC) in a DC power supply.

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Description

Test your knowledge of the block diagram of a d.c. power supply, including the components and their functions such as the step-down transformer, rectifier diodes, and smoothing and filtering circuits.

D.C. Power Supply Block Diagram