 Hello friends, I hope you all are doing great. In today’s tutorial, we will discuss What is the Power Diode. The diode is a commonly used module in electrical and electronic engineering. Almost in every electronic device and engineering project diodes are used. It is a PN junction device that has 2 terminals, anode and cathode. The main function of the diode is to convert the alternating current into the direct current, this feature of the diode is called rectification. When it works on the positive cycle of the alternating current its state named as forward biased when it works on the negative cycle of the ac its operating state known as reverse biased. In 1906 the first diode was manufactured by the crystals of the minerals.

Power diode is identical to the other semiconductor diodes but has some differences in structure. Normal diodes are used for smaller amplification and switching circuitries but power diode used in higher amplification circuits. In today’s post, we will discuss its structure, applications, circuits, and working principle. So let’s get started with a what is the power diode.

#### What is the Power Diode

• Power Diodes are such semiconductor devices used in rectifier circuitries to rectify higher value current.
• This diode has a larger area of PN junction then other diodes, due to this ability is used to rectifier higher value current and voltage, like hundred amperes and thousand kilovolts.

#### Half Wave Rectification of Power Diode

• Such circuitry that converts the alternating current into the direct current is called rectifier circuit.
• The rectifier that converts half-wave of the alternating current into the direct current called half-wave rectifier.

Half Wave Rectifier Circuit

• In the given diagram you can see the circuitry of the half-wave rectifier, that has power diode and resistor (R) as output.
• You can see from the figure that the anode of the diode is connected with the positive end of the alternating current source through the transformer that used to step down the voltage and cathode is connected with the negative end. It is the forward-biased form of the diode.
• When the first half waveform of the alternating current passes through the diode, it rectifier this half-cycle to the DC and not work for the negative half of the wave.
• As the output is the resistance, so the current flowing through this resistance will follow Ohm’s law, so the current of the resistance will directly proportionate to the applied voltage.
• The voltage across the resistance will be similar to the input supply Vs, for half sinewave voltage across the resistance will be Vs.

Half-Wave Rectifier with Capacitor

#### I-V characteristic Curve of Power Diode

• You can see the voltage and current characteristics curve in the given figure.
• We can observe from the graph that the forward-biased current rises with the applied voltage.
• In reverse biased mode, very less leakage current flows, this current does not depend on the revered biased voltage.

#### Difference between Diode and Power Diode

•  Power diode and normal diodes have some dissimilarities that are described here with the detailed.

Structure:

• The physical structure of the normal PN junction diode has an equal area of P and N sides but in power diode, one region is largely doped and other is less doped.
• The size of the normal diode is small and power diodes are available in a larger size
• Power diodes are mostly constructed by metallic components.

Voltage Ratings:

• Normal semiconductor diodes are used in lesser power circuitries that way there operates at less voltage.
• Power diodes are used in such devices that work on the kilovolts so they have higher ratings.

Current Rating:

• The current ratings of the power diodes are higher than the normal diodes. Power diodes work for such circuitries where hundred amperes current is required.

Temperature:

• As the current and voltage ratings of the power diodes are higher so they have the ability to work at a higher temperature. The normal diode work in low-temperature conditions.

Cost:

• The price of the is high than the normal diodes because power diodes provide an additional feature like high-temperature rating, etc.

So, it is the detailed article on the power diode, if you have any question about it ask in comments. Thanks for reading. Take care until the next tutorial.