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Questions and Answers
What is the purpose of a regulator circuit in a DC power supply?
To keep the output voltage constant regardless of changes in the load or input voltage.
What is the simplest type of shunt voltage regulator circuit?
A circuit using a zener diode.
How is the value of R calculated in a zener diode voltage regulator circuit?
R = (Vi - Vz) / I.
What is the output voltage in a zener regulator circuit, despite varying input voltage?
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What is the characteristic of a zener diode that makes it suitable for use in a voltage regulator circuit?
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What is the term used to describe the output of a regulator circuit?
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What happens to the total current I when the input voltage Vin increases?
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What is the condition for the output voltage V to remain constant?
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What happens to the current Iz when Vin decreases?
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What is the purpose of the zener diode in a voltage regulator circuit?
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What is the condition for a zener regulator to regulate the output voltage under varying load conditions?
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Study Notes
DC Power Supply
- A circuit used after the filter is a regulator circuit, which produces a regulated smooth d.c. supply.
- The output of a regulator is called regulated smooth d.c. supply, to which the load can be connected.
Regulator Circuit
- A regulator is a circuit that keeps output voltage constant irrespective of changes in the load or input voltage.
- The simplest shunt voltage regulator circuit uses a zener diode to regulate the load voltage.
Zener Diode Voltage Regulator
- The zener diode has a characteristic that as long as the current through it is between Izmin and Izmax, the voltage across it is constant and equal to the zener voltage Vz.
- The zener diode is connected in shunt with the load resistance, and the output voltage is equal to the zener voltage.
- The value of R can be obtained mathematically as R = (Vi - Vz) / Iz.
Regulation with Varying Input Voltage
- When input voltage varies, the total current I increases or decreases.
- To keep I constant, Iz increases or decreases, but as long as Iz is between Izmin and Izmax, the output voltage remains constant.
Regulation with Varying Load
- When load varies, the current IL increases or decreases.
- To keep I constant, Iz increases or decreases, but as long as Iz is between Izmin and Izmax, the output voltage remains constant.
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Description
This quiz covers the basics of DC power supply and voltage regulators, including block diagrams, operation, and waveforms. Topics include Zener diode voltage regulators and regulated smooth DC supply.
