A diode is an electronic/semiconductor device with two terminals. A diode is used as an electric component in which the current has a unidirectional flow only if the diode works under the specified voltage.
This component has two terminals in which one terminal bears a high resistance, while the other bears a low resistance.
We have another type of diode which is called the ideal because it bears a zero resistance in one direction only and the infinite resistance in another resistance.
On this page, we will understand diode examples, the use of diode, and the application of diodes.
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What is Diode Used For?
One of the most important uses of diode is as an electronic component for regulating the unidirectional flow of the current.
Below are the diode examples with the use of diode in day-to-day life:
Zener diodes - They are used to regulate the voltage to protect circuits from high voltage surges,
Avalanche diodes - They are used to electronically tune radio and TV receivers.
Varactor diodes are used to generate radio-frequency oscillations
Tunnel diodes - These diodes are used as RF circuits.
Gunn diodes, IMPATT diodes
LED or the light-emitting diode to produce light under the positive waveform of the voltage.
PIN Diode has both P-type and N-type standard regions, but the space between the two areas is the intrinsic semiconductor, and these diodes are not doped.
Variable capacitance diodes for tuning.
Do You Know?
A diode appears to be an open circuit with a negative voltage that looks like a short circuit. Since the diode shows some inefficiency, the graph between the current and voltage appears non-linear.
One of the incredible and simple two-pin semiconductor devices like a diode is vital in modern electronics.
So, we find the application of diode in various fields, some of these are as follows:
Application of Diode
Rectifying a voltage: turning AC into DC voltages
Drawing signals from a supply
Controlling the size of a signal
Mixing (multiplexing) signals
As freewheeling of the inductive energy
What is the Use of Diode?
Below are the real-life applications of a diode:
1. Rectifying a Voltage
We use diodes for converting AC power to DC. A single diode or four diodes can convert 110V household power to DC by forming a half-wave (single diode) or a full-wave (four diodes) rectifier.
So, how does it happen?
The diode allows only half of the AC waveform to pass through it. When this voltage wave charges a capacitor, the output voltage seems to be a steady DC voltage with a small voltage waveform.
Using a full-wave rectifier makes this process more efficient by routing the AC pulses in a way that both the positive and negative halves of the input sine wave are seen as only positive pulses, constructively doubling the frequency of the input pulses to the capacitor, which helps to keep it charged and remit a more stable voltage.
2. Diodes and Capacitors
Diodes and capacitors can create varying voltage multipliers to generate a small AC voltage and multiply them to create very high voltage outputs.
Both AC and DC outputs are possible if the right configuration of capacitors and diodes are used.
3. Diode Used as a Flashlight
An LED flashlight is an illuminating light-emitting diode and it glows in the presence of the positive voltage.
A photodiode captures current or the light through a collector (like a mini solar panel device), and converts it into a small amount of current.
Why Diode is Used?
1. Diode as a Current Steering Wheel
The basic function for which diode is used is, to steer the current and make sure it flows in the proper direction.
One area where the current steering capability of diodes is found is, it has a good effect in switching from the power coming from a power supply to power running from a battery.
When a device is plugged in and charged, just like the cell phone or uninterruptible power supply, the device draws power only from the external power supply and not the battery, and while the device is plugged in the battery draws the power and recharges. As soon as the power source is removed, the battery powers the device so that no interruption is noticed by the user.
2. A Diode Used For Demodulation of Signals
The most common use of diodes is found in removing the negative component of an AC signal.
Since the negative portion of an AC waveform is usually identical to the positive half, so very little information is lost during the process of a wave portion stripping away; therefore, leading to more efficient signal processing.
The demodulation of signals is commonly used in radios as the component of the filtering system to draw the radio signal from the carrier wave.