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Home > Mall Dynamic > Knowledge Popularization | What Are The Roles And Functions OF Diodes?
In this large family of electronic components, the diode occupies a relatively important position, it is a device with two electrodes, only allows the current to flow through a single direction, many uses are applied to its rectification function. The current directivity of most diodes is often referred to as "Rectifving". The most common function of a diode is to allow the current to pass in only one direction (called forward bias) and block it in the opposite direction (called reverse bias). Therefore, the diode can be thought of as the electronic version of the check valve.
One of the functions of the diode is rectification, and the diode that completes the rectification function is called the rectifier diode. Because the diode has unidirectional conductivity, it can convert alternating alternating current into pulsed direct current in a single direction to complete the function of rectification.
The second role of the diode is limiting, and the diode that completes the limiting role is called limiting diode. Since the forward voltage is added to both ends of the diode to make it switched on, its forward voltage drop basically remains unchanged, so it can be used as a limiting element in the circuit to limit the amplitude of the signal within a certain range.
The third role of a diode is to be used as a switch, and the diode that completes the switch role is called a switching diode. Because the diode has unidirectional conductivity, the resistance is very small under the action of forward voltage, which is equivalent to a path, similar to the switch on state; Under the action of reverse voltage, the resistance is very large, which is equivalent to a break, similar to a switch closed state. This switching property of diodes allows them to form various logic circuits,
The fourth role of the diode is the continuous current, often in the inductance of the switching power supply or the inductive load of the relay plays a continuous role,
The fifth role of the polar tube is voltage regulation, and the diode that completes the voltage regulation is called a voltage regulator diode. The voltage regulator diode is a junction silicon diode that works in the reverse breakdown state. The current limiting resistor is inserted into the voltage regulator circuit in series to limit the current value after the breakdown of the voltage regulator diode, so that its breakdown state can be maintained.
The sixth role of the diode is varactor, and the diode that completes the varactor role is called varactor diode. The static capacity of the PN junction can be changed by applying reverse voltage to it, so as to achieve the function of varactance, which is often used in the channel conversion and tuning circuit of the TV high frequency head.
The seventh role of the diode is the display, the diode that completes the display role is called the light-emitting diode (LED), which is often used in VCD, DVD, calculator and other displays, such as the indicator light of the computer hard disk, the indicator light of the charger, etc., are the application of light-emitting diodes in life.
Eight of the role of the electrode is the trigger, the triggering diode is called the trigger diode, also known as the bidirectional trigger diode (DIAC), is a symmetrical two-terminal semiconductor device, often used to trigger bidirectional thyristor, used as overvoltage protection in the circuit.
The ninth function of the diode is detection, and the diode that completes the detection function is called the detection diode. Detection is mainly to detect the low-frequency signal in the high-frequency signal, which is often used in the radio.
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