File Name: line and load regulation of zener diode experiment .zip
Load regulation is the measure of the ability of a power supply to maintain a constant output voltage despite changes in output current or load. A good load regulation ensures that the power supply will deliver a required and stable voltage to the circuit or system. When choosing a power supply, it is important to pay attention to the load regulation as specified in the data sheets.
The Zener diode is like a general-purpose signal diode. When biased in the forward direction it behaves just like a normal signal diode, but when a reverse voltage is applied to it, the voltage remains constant for a wide range of currents. Avalanche Breakdown : There is a limit for the reverse voltage. Reverse voltage can increase until the diode breakdown voltage reaches. This point is called Avalanche Breakdown region. At this stage maximum current will flow through the zener diode. Fig 1: Zener diode.
To study the I-V characteristics of a zener diode and its application as a voltage regulator in a DC power supply and determine the line and load regulations. A Zener diode is different it is a silicon diode that the manufacturer has optimized for operation in the breakdown region. It is used to build voltage regulator circuits that hold the load voltage almost constant despite large change in line voltage and load resistance. Figures below show the symbol of Zener diode and its operating region. These diodes can operate in any of the three regions: forward, leakage and breakdown. Second approximation: The Zener diode is modeled with a battery of voltage VZ0 in series with resistance rz, called the zener resistance, to account for the slight increase in the zener voltage VZ with the zener current IZ. Voltage regulation, a measure of performance of voltage regulator circuits, is classified as two types:.
Load regulation is the capability to maintain a constant voltage or current level on the output channel of a power supply despite changes in the supply's load such as a change in resistance value connected across the supply output. Load regulation of a constant-voltage source is defined by the equation: . For a constant-current supply, the above equation uses currents instead of voltages, and the maximum and minimum load values are when the largest and smallest specified voltage across the load are produced. For switching power supplies, the primary source of regulation error is switching ripple, rather than control loop precision. In such cases, load regulation is defined without normalizing to voltage at nominal load and has the unit of volts, not a percentage.
It has higher gain, frequency, and voltage ratings. The voltage flowing in the zener diode of a regulator circuit is a negative voltage or that its electrons flowing. By passing a small current through the diode, close to 0 A, from a voltage source, the zener diode conducts sufficient current to maintain a voltage drop at Vout.
Zener diode as voltage regulator experiment pdf This may. While doing the experiment do not exceed the readings of the diode. Required Graph
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AIM: To setup and study a zener diode shunt regulator and to plot its line and load regulation characteristics. COMPONENTS REQUIRED: Zener diode, resistor.Reply
A Zener diode is a special type of diode designed to reliably allow current to flow "backwards" when a certain set reverse voltage, known as the Zener voltage , is reached.Reply
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Zener diodes are a special kind of diode which permits current to flow in the forward direction.Reply