LED (Light Emitting Diode) has high photoelectric conversion performance. Its basic structure is an electroluminescent semiconductor crystal placed on a leaded shelf and then sealed with epoxy resin to protect the internal core. use. If a current passes, the crystal will illuminate, and different semiconductor crystals will emit light of different colors. The principle is that in some PN junctions of semiconductor materials, the injected minority carriers recombine with the majority carriers to release excess energy in the form of light, thereby directly converting electrical energy into light energy. The PN junction adds a reverse voltage, and minority carriers are difficult to inject, so they do not emit light.
And what is a zener diode (zener diode)?
When a current breakdown occurs in the diode, the diode is not damaged as long as the breakdown current has not reached the current required for the avalanche breakdown, and the diode reverse voltage is fixed at a specific value. When the voltage applied in the direction of the two ends of the diode disappears, the diode will automatically recover and will not be damaged. This breakdown is called Zener breakdown. One of the characteristics of diode Zener breakdown is used to make a Zener diode.
Such a diode is a semiconductor device that has a very high resistance until a critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance is reduced to a small value. In this low resistance region, the current increases and the voltage remains constant. The Zener diode is binned according to the breakdown voltage because of this characteristic. The Zener diode is mainly used as a voltage regulator or voltage reference component. Its volt-ampere characteristics, Zener diodes can be connected in series for use at higher voltages, and more stable voltages can be obtained by series connection.
The Zener diode is different from the é”— diode: if the reverse voltage, sometimes referred to as the bias voltage, when the reverse voltage is increased to a certain value, for a small bias change, the current will produce a considerable increase. The voltage that causes this effect is called the breakdown voltage or Zener voltage. For example, the breakdown voltage of the 2DW7 tube is between 5.8 and 6.5V, and the maximum current is 30mA.
main application:
1, surge protection
2, overvoltage protection in the TV
3, arc suppression
4, series regulator
The voltage regulator diode can be applied to the LED light-emitting diode. For example, when making a high-power LED, we can connect a Zener diode to ESD in parallel, or connect a voltage regulator diode in series, which can help the voltage regulator and avoid the LED. The component is destroyed by current.
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