line and load regulation of zener diode experiment pdf

Line And Load Regulation Of Zener Diode Experiment Pdf

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Published: 19.05.2021

The Zener diode is like a general-purpose signal diode.

Zener diodes are a special kind of diode which permits current to flow in the forward direction. What makes them different from other diodes is that Zener diodes will also allow current to flow in the reverse direction when the voltage is above a certain value. This breakdown voltage is known as the Zener voltage. In a standard diode, the Zener voltage is high, and the diode is permanently damaged if a reverse current above that value is allowed to pass through it. Zener diodes are designed in a way where the Zener voltage is a much lower value.

Load Regulation

Zener diode as voltage regulator experiment pdf This may. While doing the experiment do not exceed the readings of the diode. Required Graph What makes them different from other diodes is that Zener diodes will also allow current to flow in the reverse direction when the voltage is above a certain value. Bridge rectifier circuit.

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 power supply should be able to supply a constant and reliable power to within the specified load current range. The load regulation is not a fixed number but rather presented as a percentage. There several methods of determining the load regulation of a power supply, the simplest one is to use resistors that present the minimum load, the maximum load and the nominal load to the power supply.

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: [3]. 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. A simple way to manually measure load regulation is to connect three parallel load resistors to the power supply where two of the resistors, R 2 and R 3 , are connected through switches while the other resistor, R 1 is connected directly. The values of the resistors are selected such that R 1 gives the highest load resistance, R 1 R 2 gives the nominal load resistance and either R 1 R 2 R 3 or R 2 R 3 gives the lowest load resistance.

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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. Zener diodes are manufactured with a great variety of Zener voltages and some are even variable. Diodes with a higher Zener voltage have a more gradual junction and their mode of operation also involves avalanche breakdown. Both breakdown types are present in Zener diodes with the Zener effect predominating at lower voltages and avalanche breakdown at higher voltages. Zener diodes are widely used in electronic equipment of all kinds and are one of the basic building blocks of electronic circuits. They are used to generate low-power stabilized supply rails from a higher voltage and to provide reference voltages for circuits, especially stabilized power supplies. They are also used to protect circuits from overvoltage , especially electrostatic discharge ESD.

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 diodes except you do not regulate by dumping the maximum load into the Zener diode; rather you regulate the series PWM with an inductor current and pulse and compare that voltage and current with a stable current into a low-power Zener diode, programmable Zener diode, or an LED voltage. Features: Zener Voltage: 3. To check a Zener diode, it is connected across a DC power supply with a suitable resistor in series, then the voltage drop across Zener diode is measured using a multimeter.


AIM: To setup and study a zener diode shunt regulator and to plot its line and load regulation characteristics. COMPONENTS REQUIRED: Zener diode, resistor​.


Load regulation

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Zener diode

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2 comments

Amaury M.

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Zachary M.

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.

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