What is the conclusion of Zener diode experiment?
What is the conclusion of Zener diode experiment?
Conclusion. The Zener diode, with its accurate and specific reverse breakdown voltage, allows for a simple, inexpensive voltage regulator. Combined with the right resistor, fine control over both the voltage and the supply current can be attained.
How is the value of Zener diode determined?
The negative or black lead of the multimeter should be on the cathode or marked side of the diode. A forward-biased silicon diode should read 0.5 to 0.7 volts, so this is the reading you should see for the zener. To test the reverse-biased voltage, switch the multimeter leads.
What is the value of Zener diode?
The Zener diode operates just like the normal diode when in the forward-bias mode, and has a turn-on voltage of between 0.3 and 0.7 V. However, when connected in the reverse mode, which is usual in most of its applications, a small leakage current may flow.
What is the aim of Zener diode experiment?
AIM: To setup and study a zener diode shunt regulator and to plot its line and load regulation characteristics. COMPONENTS REQUIRED: Zener diode, resistor, rheostat, voltmeter, ammeter, DC source and bread board. THEORY: A zener diode functions as an ordinary diode when it is forward biased.
At what value of Zener current is the Zener voltage normally specified?
Voltage Vz Values generally start at around 2.4 V although not all ranges extend as low as this. Values below this are not available because the diodes do not break down below this voltage. Ranges may extend top anywhere in the region of 47 V to 200 V, dependent upon the actual Zener diode range.
What is the characteristics of Zener diode?
Zener diodes are heavily doped than ordinary diodes. They have extra thin depletion region. When we apply a voltage more than the Zener breakdown voltage (can range from 1.2 volts to 200 volts), the depletion region vanishes, and large current starts to flow through the junction.
How do you determine the value of a diode?
A diode rating can be determined by its color pattern. Diodes allow conduction of electric current in one direction while blocking current from the reverse direction. Diodes come with colored stripes that help you read the value on the diode.
What is diode value?
In a small silicon diode operating at its rated currents, the voltage drop is about 0.6 to 0.7 volts. The value is different for other diode types—Schottky diodes can be rated as low as 0.2 V, germanium diodes 0.25 to 0.3 V, and red or blue light-emitting diodes (LEDs) can have values of 1.4 V and 4.0 V respectively.
What is the maximum and minimum values of Zener diode current?
The input voltage varies between 13 V and 16 V and the load current varies between 10 mA and 85 mA. The minimum zener current is 15 mA.
How do you calculate the value of a diode?
Connect the probes in series with the circuit and then read the amount of current. You can then use this value in the above formula to calculate the resistance. Once the thermal voltage and the diode current are calculated, the diode resistance can be calculated using the formula, Rd= VT/ID.
Which Zener is used in the experiment?
The Zener diode mainly operates in reverse biased condition. We use Zener diodes for voltage regulation and voltage stabilisation. They provide a low-cost and no frill method for voltage regulation.
What is a Zener diode explain its action as a voltage regulator?
Zener diode is a silicon semiconductor with a p-n junction that is specifically designed to work in the reverse biased condition. When forward biased, it behaves like a normal signal diode, but when the reverse voltage is applied to it, the voltage remains constant for a wide range of currents.
What is the maximum zener current?
The maximum current is calculated by dividing the power rating by the Zener voltage: I=P/V = 3W/12V = 0.25A. In this case, the datasheet specifies 250 mA as the maximum current, so the calculation wasn’t necessary.
What is test current in Zener diode?
Test current is the current at which the zener breakdown voltage and equivalent internal impedance specifications are guaranteed. Currents higher than the test current result in slightly higher breakdown voltage and lower internal impedance.
What is Zener diode explain its action as a voltage regulator?
What is Zener voltage range?
Zener/Breakdown Voltage – The Zener or the reverse breakdown voltage ranges from 2.4 V to 200 V, sometimes it can go up to 1 kV while the maximum for the surface-mounted device is 47 V. Current Iz (max) – It is the maximum current at the rated Zener Voltage (Vz – 200μA to 200 A)
How do you read a diode marking?
Diode Polarity The polarity of both diodes is indicated with a stripe on one end of the body. The stripe corresponds to the line in the schematic symbol, indicating the cathode. The other end (no stripe) is the anode, indicated by the triangle in the schematic symbol.
How do you read a diode value?
Diode Mode Testing Procedure Connect the red probe of the multimeter to the anode and black probe to the cathode. This means the diode is forward-biased. Observe the reading on multimeter’s display. If the displayed voltage value is in between 0.6 to 0.7 (for a Silicon Diode), then the diode is healthy and perfect.
How do you measure the value of a diode?
A diode is best tested by measuring the voltage drop across the diode when it is forward-biased. A forward-biased diode acts as a closed switch, permitting current to flow. A multimeter’s Diode Test mode produces a small voltage between test leads.
What is the minimum voltage for a Zener diode?
The zener will conduct minimum current (i.e. 15 mA) when input voltage is minimum (i.e. 13 V).
What is minimum zener current?
Current specification The current, IZM, of a Zener diode is the maximum current that can flow through a Zener diode at its rated voltage, VZ. Typically there is also a minimum current required for the operation of the diode. As a rough rule of thumb, this can be around 5 to 10 mA for a typical leaded 400 mW device.
What is breakdown voltage of Zener diode?
Zener/Breakdown Voltage – The Zener or the reverse breakdown voltage ranges from 2.4 V to 200 V, sometimes it can go up to 1 kV while the maximum for the surface-mounted device is 47 V.
What is VI characteristics of Zener diode?
VI characteristics of zener diode When reverse biased voltage is applied to a zener diode, it allows only a small amount of leakage current until the voltage is less than zener voltage. When reverse biased voltage applied to the zener diode reaches zener voltage, it starts allowing large amount of electric current.
How is zener voltage calculated?
Zener voltage regulator calculation VS – VZ = VR; 8V – 6V = 2V. Let take a minimum current Iz as 10mA at Full Load. The voltage across the zener remains a constant value VZ for any increase in the input voltages above VZ. The zener and Load resistance is in parallel.