Jump to Voltage regulator - Examples of a voltage regulator. A Zener diode can be applied in a voltage regulator circuit to regulate the voltage applied to a Working principle: Zener breakdown. Electronics Tutorial about the Zener Diode and how the Zener Diode can be used with a series resistor to produce a Zener Diode Voltage Regulator Circuit. A Zener Diode is an electronic component which can be used to make a very simple voltage regulator circuit. This circuit enables a fixed stable voltage to be.
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Physical Sciences : Amrita Vishwa Vidyapeetham Virtual Lab
A conventional solid-state diode allows significant current if it is reverse-biased above its reverse breakdown voltage. When the reverse bias breakdown voltage is exceeded, a conventional diode is subject to high current due to avalanche breakdown.
Unless this current is limited by circuitry, the diode may be permanently damaged due to zener voltage regulator. A Zener diode exhibits almost the same properties, except the device is specially designed so as to have a reduced breakdown voltage, the so-called Zener voltage.
By contrast with the conventional device, zener voltage regulator reverse-biased Zener diode exhibits a controlled breakdown and allows the current to keep the voltage across the Zener diode close to the Zener breakdown voltage.
What Are Zener Diodes? | Diodes and Rectifiers | Electronics Textbook
For example, a diode with a Zener breakdown voltage of 3. The Zener diode is therefore ideal for applications such as the zener voltage regulator of a reference voltage e. Remember that the purpose of a regulator circuit is to provide a stable voltage for another circuit.
What it zener voltage regulator supposed to do is maintain However, as we will see, it cannot accomplish this task.
zener voltage regulator If we actually had This load current would have to go through the series dropping resistor as it did before, but with a new much larger!
The situation is easier to comprehend if we temporarily remove the Zener diode from the circuit and analyze the behavior of the two resistors alone in Figure below.
Non-regulator with Zener removed.
With a total voltage of 45 volts and a total resistance zener voltage regulator Thus, the diode ceases to regulate voltage. The analytical technique of removing a Zener diode from a circuit and seeing whether or not enough voltage is present to make it conduct is a sound one.
Remember that Zener diodes work by limiting voltage to some maximum level; they cannot make up zener voltage regulator a lack of voltage.
If the load resistance is too low, it will draw too much current, dropping too much voltage across the series dropping resistor, leaving insufficient voltage across the Zener diode to make it conduct.
When the Zener diode stops conducting current, it can no longer regulate voltage, and the load voltage will fall below the zener voltage regulator point. To find this acceptable load resistance value, we can use a table to calculate resistance in the two-resistor series circuit no diodeinserting the known values of total voltage and dropping resistor resistance, and calculating for an expected load voltage of With 45 volts of total voltage and That means, magnetism and electricity are so closely related to each other.
- Zener Diode Voltage Regulator |
- What Are Zener Diodes?
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Zener diode - Wikipedia
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Choose a Zener Diode Since we need 8 Volts we can choose between a 7. Calculate the Maximum Current in the Circuit Our load device needs mA of current, plus we also need at zener voltage regulator 5mA for the zener diode, therefore lets set Imax as mA to be safe.
Select zener voltage regulator Power Rating of the Zener Diode Zener diodes are available in a range of difference power ratings. If a large current flows through a small zener diode it will be destroyed, therefore zener voltage regulator calculate the power to be lost in the diode and select a diode rated above that value.