The diode is useful because of its directional behavior, which allows forward flow of current and blocking in the opposite direction.The unidirectional property of this diode is useful for converting ac to dc called as rectification.
A reason for this unidirectional behavior is their non-linear v-i characteristics.
The diode rectifier is designed to stop the flow of electricity in the wrong direction. the diode is sometimes known as a rectifier for its use to repair the alternating electric current into direct current, by removing the negative part of the current.
Light-emitting diodes or led may be the most famous and most easily identifiable. led emits visible light when electrons jump across a pn junction. the resulting light is referred to as electroluminescence.Photo diode is only done when they are exposed to light. this can be useful in making projects with light-activated switches, so the circuit is only active in the presence of light.Zener diodes are designed to perform in reverse direction, only when something called translucent voltage is reached, the circuit will do.The diode is an uncontrolled switch which means we can not decide when to turn it on / off. they are used in circuits depending on this utility. they provide forward blocking for voltages less than built voltage, forward conduction for voltages over built voltages and they do not perform at reverse voltage (leakage current may exist).
So, the application is anywhere where we need conduction for positive voltage and blocking for negative voltage, for example. half wave rectifier.
Diodes are electronic devices that allow current to flow in one direction only. it is a semiconductor consisting of a p-n connection.
They are used most commonly for
1. rectifying an ac signal to get dc.
2. demodulating an am signal.
3. logic- determining when a signal has gone low or high.
4. as a forward voltage drop of about .7v for voltage reference.
Check different types of diodes:
The diode is proportional to the electric version of the valve, instead of preventing water from the reverse, the diode stops the electric current from the reverse.
Common electronics paired up with the diode:
Chip ic regulator (7805, 7812, 7824) – zener diode is thrown with a bunch of resistors to dispose of excess voltage. internally. all the circuit designers will see the chip with 3 feet.
Capacitor – a more effective method is to use capacitors before and after the regulator to stabilize the waveform a bit more. Additional capacitors can be added to create a voltage enhancement circuit. according to IEEE standards the electric flux leading to the main equipment should not exceed 10%.
Relay – diode is placed parallel to the relay coil preventing back e.m.f. from interference with the original signal, a problem known as a relay chats.
Resistor – useful for reducing the original voltage using the voltage divider rule, before you place the regulator a moderate waveform. replace the resistor with a potentiometer if you want. the concept of vdr is the same. the excess voltage will be absorbed by the resistor, not the diode regulator. regulators can be damaged, which makes the next component important.
Heat sink – for power components like this, heat sinks act to extend component life. fans can be added to accumulate cooling effects.
Bridge diode – single ic chip consisting of a group of 4 diodes. ac wave is converted to dc waveform, although its output will be half input. for example, if the input is 120 vac, the rectifier output is 60 vdc. this is usually used for mobile phone chargers or power supplies.