Power Supply Circuit With Zener Diode

The diode is reverse.

Power supply circuit with zener diode. All linear power supply circuits which are designed to produce a stabilized constant voltage and current output fundamentally incorporate transistor and zener diode stages for getting the required regulated outputs. As a blogger life is miserable i can just about afford an old banger with a knackered battery. The zener diode is used in its reverse bias or reverse breakdown mode i e. The way out of it is to use a zener diode circuit with a seris pass transistor.

One of the main application of a zener diode in circuits is it can be used to obtain constant reference voltage values. This zener diode power supply circuit produces constant 4 7 v dc from 10 v to 14 4 v input. It provides a maximum of 100 ma for the load which is sufficient to power my small cd player in the car. When using such a circuit the current needed from the zener resistor potential divider must be calculated.

Instances of power supply failure are normally seen as when the power supply stops working and there is no output. Zener diode regulator circuit zener voltage 12 6v. However this stability and accuracy is generally good enough for the zener diode to be used as a voltage regulator device in common power supply circuit in the figure below. The diodes anode connects to the negative supply.

Some zener diodes have a sharp highly doped p n junction with a low zener voltage in which case the reverse conduction. Zener diodes are manufactured with a great variety of zener voltages and some are even variable. 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. As the voltage across the zener diode has always a constant for any applied voltage values above the zener voltage it can obtain a fixed voltage value in a circuit which has a variable or fluctuating power supply.

For a linear regulator we can take the example of a very simple zener diode based regulator. From the i v characteristics curve above we can see that the zener diode has a region in its reverse bias characteristics of almost a constant negative voltage regardless of the value of the current flowing through the diode. Zener diode circuit for a simple regulated power supply. Zener diode operation please take note of the zener diode s orientation in the above circuit.