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Questions and Answers
What is the purpose of a regulator circuit in a DC power supply?
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?
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?
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?
What is the output voltage in a zener regulator circuit, despite varying input voltage?
What is the characteristic of a zener diode that makes it suitable for use in a voltage regulator circuit?
What is the characteristic of a zener diode that makes it suitable for use in a voltage regulator circuit?
What is the term used to describe the output of a regulator circuit?
What is the term used to describe the output of a regulator circuit?
What happens to the total current I when the input voltage Vin increases?
What happens to the total current I when the input voltage Vin increases?
What is the condition for the output voltage V to remain constant?
What is the condition for the output voltage V to remain constant?
What happens to the current Iz when Vin decreases?
What happens to the current Iz when Vin decreases?
What is the purpose of the zener diode in a voltage regulator circuit?
What is the purpose of the zener diode in a voltage regulator circuit?
What is the condition for a zener regulator to regulate the output voltage under varying load conditions?
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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