ඩයෝඩ 3 පාඩම Signal Diode / Power Diode /free wheeling Diode / Diode Parameters

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Signal Diode / Power Diode /free wheeling Diode / Diode Parameters ඩයෝඩ 3 පාඩම සිංහලෙන්හොදට ඉගෙනගමු..
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The main difference between a signal diode and a power diode is their ability to handle electrical current.
Signal diodes are designed for low-current applications and are commonly used in electronic devices such as radios and televisions. They are small in size and have a low maximum current rating, typically in the range of a few milliamps. Signal diodes are often used to control the flow of electrical current in small-signal circuits, such as amplifiers and oscillators.
Power diodes, on the other hand, are designed to handle high-current applications and are used in power electronics applications such as power supplies and motor drives. They have a larger physical size than signal diodes and a higher maximum current rating, typically in the range of several amps to tens or hundreds of amps. Power diodes are often used in circuits where large amounts of electrical power need to be controlled or converted.
In addition to their current-handling capabilities, power diodes also have a higher voltage rating than signal diodes. This is because power diodes are typically used in applications where high voltages are present, such as in power supplies and inverters. Power diodes may also have additional features such as fast recovery times and high temperature ratings, which allow them to withstand harsh operating conditions.
Overall, the main difference between signal diodes and power diodes is their current-handling capabilities. Signal diodes are designed for low-current applications, while power diodes are designed for high-current applications.
1N4007 - 1000V , 1A, often used as a (small) power rectifier.
1N4148 - 100V, 150mA, often used as a signal detector.
The physical dimensions of the active part of the diode are different, the 1N4007 has more area. to handle more current.
The doping of the semiconductor is different to allow higher voltages for the 1N4007.
The ‘reverse recovery time’ for the 1N4148 is fast, sub 10ns so it will work well at high frequencies. That parameter isn’t even specified for the 1N4007 so it is not suitable for high frequencies.
More extreme examples:
BAT48 - for very small turn-on voltage. Good for ‘crystal sets’.
VS-40HF - high-power rectifie
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