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Anti-interference LED overvoltage protection module and anti-interference LED overvoltage protection system

A technology of overvoltage protection and voltage regulator tube, which is applied in the field of anti-interference LED overvoltage protection module and anti-interference LED overvoltage protection system, can solve the problems of high cost, complex peripheral circuits, and susceptibility to interference, and achieve low cost, The peripheral circuit is simple and the effect of avoiding false triggering

Inactive Publication Date: 2016-10-05
上海含英微电子有限公司
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  • Abstract
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Problems solved by technology

[0007] In view of the defects in the prior art, the object of the present invention is to provide an anti-jamming LED overvoltage protection module and an anti-jamming LED overvoltage protection system, which realizes the minimum demagnetization time by pulling up the overvoltage protection setting resistor to VCC setting, so as to realize the anti-interference overvoltage protection function, and overcome the technical problems of high cost, complex peripheral circuits, or susceptibility to interference of traditional overvoltage protection methods

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[0031] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032]The anti-interference overvoltage protection detection control module and the anti-interference overvoltage protection system of the present invention are used in the LED power supply scheme without auxiliary winding. The present invention finds by analyzing the existing realization circuit of the overvoltage protection of the LED drive power supply, when the auxiliary winding is used to detect the output voltage, the information sampling of the output voltage is more accurate, and the overvo...

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Abstract

The invention provides an anti-interference LED overvoltage protection module and an anti-interference LED overvoltage protection system. The anti-interference LED overvoltage protection module comprises elements such as a voltage-regulator tube. An overvoltage protection setting resistor, a minimum demagnetization time capacitor and a minimum demagnetization time comparator set a minimum demagnetization time. When the circuit demagnetization time detected by a demagnetization detection unit is smaller than the minimum demagnetization time, an overvoltage protection unit detects output voltage is overvoltage. Through the overvoltage protection setting resistor pulled up to the voltage-regulator tube, setting of the minimum demagnetization time is realized, an anti-interference overvoltage protection function is thus realized, and the technical problems the traditional overvoltage protection mode is high in cost, complicated in a peripheral circuit or likely to interfere can be overcome.

Description

technical field [0001] The invention relates to the technical field of overvoltage protection detection in switching power supplies, in particular to an anti-interference LED overvoltage protection module and an anti-interference LED overvoltage protection system. Background technique [0002] The function of the LED drive power supply is to provide a constant output current of the LED lamp, but if the output LED is open circuit or other conditions that increase the output voltage occur, the LED drive power supply must take corresponding measures to keep the output voltage not exceeding the withstand voltage of the output capacitor, otherwise output capacitor will be destroyed. In the traditional LED drive power scheme, a separate transformer winding is generally used to detect the output voltage, and then divided by resistors, input to a separate pin of the chip to directly detect the output voltage, so as to determine whether the drive power has overvoltage. [0003] The ...

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Application Information

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IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 李君
Owner 上海含英微电子有限公司
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