To study zener diode as voltage regulator.
Power Supply, Zener Diode, Two Voltmeter and connected leads Ammeter.
The Zener diode is operated in the breakdown or zener region, the voltage across it is substantially constant for a large current of current through it. This characteristic permits it to be used as a voltage regulator. As the lode Current increases, the Zener current decrease so that current through resistance Rs is constant. As out put voltage = Vin – Irs, and I is constant, Therefore, output Voltage remains unchanged. The input voltage Vin increase, more current will flow through the zener, the voltage drop across Rs will increase but lode voltage would remain constant.
Circuit Diagram:
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Precautions:
Result:Studied how Zener diode is used as a voltage regulator.
| Q.No. | Question | Answers |
| 1 | Give applications of Zener diode? | Applications of Zener diode are (a) Voltage regulation (b) Meter protection (c)Zener diode as a peak clipper (d) Zener diode as a reference element | 2 | What is voltage regulation of Zener diode? | Voltage regulation is a measure of circuit’s ability to maintain a constant output voltage evenwhen either input voltage or load current varies. | 3 | What is Zener current? | The Zener current in the breakdown region of Zener diode is called Zener current. | 4 | Give the equation from which series resistance of Zener diode regulator determined? | The equation from which series resistance of Zener diode regulator determined is R S = V S-V out/ I ZmaxWhere VS is source voltage,V Out is output voltage & I Zmaxis maximum current through Zener diode. | 5 | Give advantages of Zener diode regulator over other regulators? | Advantages of Zener diode regulator over other regulators are that they are smaller in size, lighter in weight and have longer life. | 6 | What is Zener diode? | Zener diode, also sometimes called the breakdown diode ia a P-N junction diode specially designed for operation in the breakdown region in reverse bias condition. | 7 | Give several methods used to manufacture of Zener diodes? | several methods used to manufacture of Zener diodes are diffused structure, diffused and passivated structure and alloy diffused structure. | 8 | In passivated structure of a Zener diode by which layer edges of the junction are covered? | In passivated structure of a Zener diode; Silicon Dioxide layer edges of the junction are covered. | 9 | Give the voltage range availability of Zener diodes? | The voltage range availability of Zener diodes is 2.4v to 200v. | 10 | What is Zener voltage? | The voltage at which the Zener diode breaks down is called the Zener voltage. |
