What's wrong with light-emitting diode leakage?

First of all, do not mix the leakage current of light-emitting diodes and power or lighting leakage.

When you connect the light-emitting diode to the DC power supply, and then the two pins of the light-emitting diode reverse connection, then you will find that a connection light-emitting diode will light, the other connection light-emitting diode does not light. Light-emitting diode light when the connection is called forward connection, not bright connection called reverse connection. Light-emitting diode forward connection allows current through, that is, you can light, while the reverse connection does not allow current through will not light. Forward connection when the conductive (allowing current through), reverse connection when the cutoff (does not allow current through), which is an important feature of light-emitting diodes, many electronic circuits is the use of light-emitting diodes of this important feature. For example, rectifier circuit, TV, computer, home appliances, radar, etc., in short, all electronic circuits are inseparable from it, light-emitting diodes are mainly used to change the alternating current into direct current.

We all know that the plug-in diode AC polarity constantly changing, a moment is positive, a moment is negative, as if the positive and negative polarity constantly changing, 50 times per second. Such electricity is alternating current, such current can not be used directly on the appliances, appliances have a rectifier circuit inside, first the alternating current into direct current and then use. Light-emitting diode leakage is how? Light-emitting diode connected to the AC circuit, the voltage is very high, when the AC current is positive when the light-emitting diode on, allowing current through, when the AC current is negative, as if the light-emitting diode is connected in reverse to a DC power supply, does not allow current through, so that the light-emitting diode will constantly change the positive and negative polarity of the AC into DC, which is the rectifier circuit. We have just said that the AC voltage is very high, the forward current when the full on, reverse current, should be completely cut off, so as to completely change the AC into DC, which is also our ideal light-emitting diode, but in fact, the light-emitting diode is connected to the high-voltage AC circuit, in the reverse current acting on the light-emitting diode, there will be a certain amount of current through, which is what we call the reverse leakage current This is what we call the reverse leakage current, because the reverse current is not needed, so called leakage current, intact light-emitting diodes, this leakage current is generally very small, in the circuit design is generally ignored, but it is an important feature of light-emitting diodes. Light-emitting diodes work with a certain range of voltage, called light-emitting diodes voltage value, generally in the selection of light-emitting diodes, can not exceed this range, otherwise, with the reverse voltage increases, the leakage current of light-emitting diodes will increase, when the reverse voltage exceeds the light-emitting diodes voltage value, the leakage current will be very large and damage the light-emitting diodes. Light-emitting diode is a classification of diodes, characterized by light-emitting, generally only connected to the permit in the low-voltage DC circuit forward connection, light indication role, generally not reverse connected to the circuit, forward connected to the circuit is generally not considered its leakage current.