LED open circuit protection integrated chip based on diode chain and manufacturing method thereof

Abstract

The invention discloses an LED open circuit protection integrated chip based on a diode chain and a manufacturing method of the LED open circuit protection integrated chip based on the diode chain. The LED open circuit protection integrated chip based on the diode chain comprises the forward diode chain formed by connecting multiple diodes in series in the forward direction, the diodes are completely identical in structure, the LED open circuit protection integrated chip further comprises a backward parallel diode connected with the forward diode chain in parallel in the backward direction, and the two ends of the forward diode chain serve as a positive electrode and a negative electrode of the LED open circuit protection integrated chip based on the diode chain. When an LED set normally works, the chip is turned off. When an LED open circuit exists, the diode chain connected in series in the forward direction in the chip is connected so as to guarantee that LEDs connected with the diode chain in series can normally work. When excessively high backward voltage occurs on the two ends of each LED, the backward diode in the chip is connected to discharge current, and an LED lamp is prevented from being burned out. The LED open circuit protection integrated chip based on the diode chain is simple in structure, stable in performance, low in cost and capable of being widely applied to LED open circuit protection and chip ESD protection.

Description

technical field [0001] The invention belongs to the field of electronic protection, and relates to an LED open-circuit protection device, specifically a diode chain-based LED open-circuit protection integrated chip, and the invention also provides a manufacturing method of the above-mentioned integrated chip. Background technique [0002] Light-emitting diodes (LEDs) are widely used in the field of lighting due to their advantages of high brightness, low energy consumption, and long life. However, because the I-V characteristics of light-emitting diodes change exponentially, even a small change in voltage will cause a large change in the current of the light-emitting diode, and the current through the light-emitting diode directly determines the brightness of the light-emitting diode, and then through The change of the current of the LED directly affects the brightness of the LED. In order to ensure that the brightness of the light-emitting diode remains unchanged, many LED...

AI Technical Summary

Problems solved by technology

[0003] Although in the prior art, it is basically possible to make the light emitting diodes of the LED light emitting array emit the same light, but in the actual use process, due to the discreteness and error of the semiconductor production process, the performance of each LED is uneven. Therefore, multiple When LEDs are connected in series, their working states are also different. When one of the LED lamp groups is open circuited, if there is no open circuit protection measure for this group of LED lamp groups, the entire series circuit will be disconnected, that is, the remaining LED lamps will be disconnected. The group can not work normally, so that the lighting of the entire LED lighting array fails, reducing the service life of the entire LED lighting array, and the staff must go through tedious tests to know which group of LED lights is faulty, and then replace it Or maintenance, thus resulting in cumbersome replacement and maintenance work in the later period

At the same time, because the LED reverse withstand voltage is very small, when electrostatic discharge occurs, the excessive reverse voltage is easy to burn the LED

[0004] In order to avoid the above situation, the existing technology usually uses an integrated amplifier and an open circuit detection and protection circuit composed of some discrete components to perform open circuit and ESD protection for each group of LED lamps. Of course, the existing protection method has the following defects: the circuit is complex , large volume, high power consumption, which is not conducive to cost reduction

Images