What is power diode?
Power diodes are not suitable for high frequency applications above 1MHz due to their large PN junctions, but special and expensive high frequency high current diodes are available. Schottky diodes are commonly used in high frequency and low voltage rectification applications due to their short reverse recovery time and low voltage drop in the forward biased state. Power diodes provide uncontrolled power rectification and are used in applications like battery charging, DC power supplies, AC rectifiers and inverters. Due to their high current and voltage characteristics, they can also be used as freewheeling diodes and snubber networks. Power diodes are designed to have forward resistance that is a fraction of ohms, while reverse blocking resistance is in the mega ohm range. Some high quality power diodes are designed to be "stud mounted" on the heatsink, reducing thermal resistance to 0.1-1o C / watt. When an AC voltage is applied to a power diode, the diode conducts current during the positive half cycle, and during the negative half cycle, the diode does not conduct and cuts off the current flow. Second, conduction through the power diode is unidirectional because it only occurs during the positive half cycle. That’s why it is Direct Current.
Power Diode Rectifier
Power diodes can be used individually as described above or connected together to create a variety of rectifier circuits such as "half wave", "full wave" and "bridge rectifier". All types of commutators use uncontrolled, semi-controlled, uncontrolled commutators that use only power diodes, fully controlled commutators that use thyristors (SCRs), and semi-controlled commutators that are a combination of diodes. It is also classified as thyristor.
The most commonly used single power diode in basic electrical device applications is the 1N400x series glass passivation general purpose rectifier diode. The standard continuous rectification forward current rating is approximately 1.0 amp, and the reverse blocking voltage rating is 50V for the 1N4001 and 1000V for the 1N4007. Here, the small 1N4007GP is the most popular for general line voltage rectification.