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Circuit for preventing power back flash of LED lamp

A technology of LED lamps and circuits, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve problems such as poor LED use experience, small charging current of LED working chips, and long startup time of LED systems, so as to prevent pull-down The effect of excessive current, low total harmonic distortion, and high power factor

Active Publication Date: 2016-09-21
SHANGHAI ORIENT CHIP TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the existing solutions can solve the problem of power-off flashback, but in the process of powering on the LED working chip, the start-up current of the LED working chip is very large when the switch control signal uvlo is at a high level, and the charging of the LED working chip The current is small, which leads to a long start-up time when the LED system is normally powered on, which brings poor LED experience to users

Method used

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  • Circuit for preventing power back flash of LED lamp
  • Circuit for preventing power back flash of LED lamp
  • Circuit for preventing power back flash of LED lamp

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Embodiment Construction

[0049] According to the attached Figure 3-6 , give a preferred embodiment of the present invention, and give a detailed description, so that the functions and characteristics of the present invention can be better understood.

[0050] see image 3 , an electric flashback prevention circuit for LED lights according to the present invention, comprising: a circuit body 1 for preventing electric flashbacks for LED lights and an input capacitor fast discharge module 2, wherein the circuit body 1 for preventing electric flashbacks for LED lights is connected to A peripheral circuit 3, the input capacitor rapid discharge module 2 is used to quickly drop the input voltage of the peripheral circuit 3 to zero when the output voltage of the power supply capacitor Cvcc reaches a preset value, so as to solve the problem of power-off flashback at the same time, The start-up current of the externally connected LED working chip is not changed, thereby not increasing the start-up time of the...

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Abstract

The present invention provides a circuit for preventing power back flash of an LED lamp. The circuit includes a circuit body for preventing power back flash of the LED lamp, and an input capacitance rapid discharge module. The circuit body for preventing power back flash of the LED lamp is connected with a peripheral circuit. The input capacitance rapid discharge module is connected with the circuit body for preventing power back flash of the LED lamp, and is used for rapidly lowering an input voltage of the peripheral circuit to zero when an output voltage of a power supply capacitor reaches a preset value. The circuit for preventing power back flash of the LED lamp does not change a start current of an LED working chip while solving the problem of power back flash, thereby not increasing starting time of normal powering of an LED system, and having advantages of preventing power back flash, having a short powering starting time, and providing good user experience.

Description

technical field [0001] The invention relates to the field of LED lamp power supply circuits, in particular to a circuit for preventing LED lamp power-off flashback. Background technique [0002] When the existing LED lighting products are turned off and powered off, there will occasionally be a power-off flashback problem in which the LED light is turned off and then turned on again, so that users cannot get a better LED light lighting experience. [0003] After the LED lamp is disconnected from the power supply, it enters the undervoltage lockout state due to insufficient power supply of the chip, and the LED lamp goes out. At this time, the charge on the input capacitor Cin has not been fully discharged, and the input voltage Vin has not been fully powered off. The working current of the working chip of the LED lamp is greatly reduced, causing the working chip to be charged to the starting voltage again, and the working chip starts to work normally and lights up again. LE...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 罗杰赵新江徐勇李俨
Owner SHANGHAI ORIENT CHIP TECH CO LTD
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