LED strips have become an integral part of our everyday lives in our technologically advanced society. With their versatile applications in various settings – be it to spruce up our homes, provide lighting solutions for professional settings, or contribute to the ambience at social events – these slender, flexible light sources have transformed how we illuminate our world.
However, LED strips are not immune to issues and challenges like all electronic devices. One of the most common problems that users encounter is flickering. A flickering LED strip can be an annoying distraction, but more importantly, it can also signify underlying electrical issues that need to be addressed.
In this comprehensive guide, we delve into the heart of the problem, exploring the possible causes and effective solutions to flickering LED strip lights. Whether you're dealing with occasional flickers, a pulsating light, or a LED strip that seems to have a life of its own, this guide is designed to equip you with the knowledge and tools to address these issues. By understanding what triggers these problems and how to fix them, you'll be able to enjoy a seamless, uninterrupted, luminous experience while extending the life and performance of your LED灯条.
目录
隐藏
1
不匹配的组件
2
连接不良
3
电源负担过重或出现故障
4
LED 灯条故障
5
LED 灯条中交流电源的波动
6
通过 PWM 调光实现隐形波动
7
Examining the Connections
8
Switching Out Incompatible Components
9
Swapping the LED Driver
10
Replacing Defective LED Strips
11
Utilizing Low Voltage DC LED Strip Lights with LED Drivers
12
Employing Dimming Power Supplies with CCR Output Signal
13
Using Dimming Power Supplies with High-Frequency PWM Output Signal
Varieties of Light Flickering
光闪烁的特点是光源快速打开和关闭。虽然它可能是有目的的，如夜总会或音乐会灯光效果所示，但它通常是一种不必要的烦恼。
闪烁主要有两类： 可见与不可见.
可见闪烁发生的频率低于 100 Hz（意味着每秒发生 100 次或更少），顾名思义，人眼可以看到它。另一方面，不可见的闪烁发生在这个频率之上，尽管它仍然存在，但我们的眼睛无法察觉。这两种类型的闪烁都会导致头晕、眼睛疲劳、头痛、偏头痛和认知障碍等健康问题。可见闪烁还可能引发癫痫患者癫痫发作。
Reasons Behind LED Strip Light Flickering
Several reasons can lead to the flickering of LED strip lights. Here are some of the common causes:
可见闪烁的原因
不匹配的组件
This typically occurs when the LED strip has a dimming feature. Verifying that your LED strip and its 司机 are dimmable is essential. Furthermore, the dimmer and driver protocols should be compatible. For instance, you cannot use a 0-10V dimmer 用 DALI调光 驱动程序。
连接不良
Flickering tends to begin or worsen significantly after a connection is made. This mainly arises from unreliable, inconsistent, or intermittent 连接 that can initiate flickering by inconsistently making and breaking circuits. Such issues predominantly occur in solderless connectors and are less likely to happen with soldering.
按下免焊连接器有时可以改变甚至消除LED灯带的闪烁。
电源负担过重或出现故障
An overloaded LED driver is one of the primary culprits behind LED strip flickering. LED 驱动器 usually come with overload protection. When overloaded, the LED driver continually switches on and off, which in turn causes the LED strip to do the same, resulting in what appears to be flickering. A faulty LED driver can also lead to LED strip flickering.
LED 灯条故障
Sometimes, a defective LED strip can lead to flickering. This usually happens due to a poor connection between the LED芯片 和持有人。
例如，考虑一下 SMD LED beads. The LED chip is the light-emitting part linked to the LED holder via a gold wire. If the connection between the LED chip and holder is unstable, the current may occasionally pass through, causing the LED to flicker.
Compared to SMD LEDs, CSP 和 COB发光二极管 lack gold wires, thus avoiding this issue.
也可能存在LED灯珠与PCB焊接不良的情况。如果 LED 灯带的特定部分闪烁，按下 LED 的该部分可能会改变或消除闪烁。
看不见的光波动
您可能会注意到智能手机相机图像中出现特殊的垂直线，或者察觉到移动物体中的频闪。这种奇怪的现象源于看不见的选通效应。
LED 灯条中交流电源的波动
光闪烁的主要原因在于传输世界上大部分电力的交流电 (AC)。顾名思义，交流电以每秒 50 到 60 次反转的速度不断改变其流动方向，通常形成正弦波。相比之下，直流电 (DC) 保持恒定，沿单一方向连续流动。
每当电流反向时，连接到线路的任何设备都会经历瞬时断电，导致灯光闪烁。这个原理解释了为什么交流电源LED灯条经常出现闪烁的效果。
通过 PWM 调光实现隐形波动
脉宽调制 (PWM) 调光会产生看不见的闪烁。
PWM represents a strategic alternation of DC power between active and inactive states. By altering the relative durations of these states, PWM can simulate different brightness levels. However, the LED is either fully off (0% brightness) or completely on (100% brightness). To create an illusion of 50% brightness, the LED remains off half the time and on the other half.
While this flicker is usually undetectable to the human eye, it can be detrimental when filming. The discrepancy between the camera's 每秒帧数 (FPS) and the electricity frequency can result in more noticeable flickers in videos, known as the 'strobe effect'.
Most LED strip dimmers and “colour-changing” 控制器 (such as CCT or RGB) employ PWM on the circuit's low-voltage DC side to achieve their desired results. However, many of these controllers use frequencies too low to be effective. Ideally, a 25,000 Hz or above frequency should be used to counteract the PWM flicker. Unfortunately, most dimmers don't specify their PWM frequency, usually indicating that they operate at least a few hundred Hz.
如何解决LED灯条闪烁的问题？
以下解决方案将有助于防止 LED 灯条闪烁。
1. 明显的闪烁
Examining the Connections
作为第一步，必须仔细检查所有连接，包括电线、连接器和 LED 驱动器，以确定它们处于最佳状态。连接错误会产生过大的电阻，导致过热，甚至引发火灾。这个问题也会导致LED灯条闪烁。
Switching Out Incompatible Components
作为第二项措施，有必要更换不兼容的部件，例如调光器、LED 驱动器等。最容易出现不兼容性的组件是调光器和 LED 驱动器。
Swapping the LED Driver
如果您的 LED 电源出现故障，请更换它或选择更高瓦数的电源。
请务必记住，当 LED 驱动器电源不足时，使用多个 LED 驱动器为单个 LED 灯条供电是不可行的。这是由于 LED 驱动器的启动时间不同所致。如果没有足够的功率，初始驱动器将触发过载保护，导致其关闭并重新启动。所有驾驶员都会持续这种循环。
Replacing Defective LED Strips
最后，必须更换出现故障的 LED 灯条。一旦您确认连接牢固、所有部件都兼容并且 LED 驱动器功能正常，最后的办法就是更换 LED 灯条。
2. 看不见的闪烁
Utilizing Low Voltage DC LED Strip Lights with LED Drivers
尽可能选择低压 LED 灯条和高质量 LED 驱动器。 LED 驱动器将高压交流电转换为稳定的低压，防止 LED 灯条闪烁。
Employing Dimming Power Supplies with CCR Output Signal
调光电源输出方式主要有两种形式——恒流降低（CCR）和脉宽调制（PWM）（也称为模拟调光）。
在 CCR 中，LED 始终保持开启状态并有连续的电流流动，而在 PWM 中，LED 不断地开启和关闭。然后，通过改变电流水平来改变 LED 的亮度。
Using Dimming Power Supplies with High-Frequency PWM Output Signal
在 PWM 中，LED 在其额定电流下以高频率快速打开和关闭。这种快速切换速度太快，人眼无法察觉。占空比，或者说 LED 亮起的时间与一个完整周期的总时间的比率，决定了 LED 的亮度水平。
相机观察到的 PWM 频率越高，闪烁的可能性就越小。如果频率超过 25 kHz，相机将不会检测到闪烁。
结语
处理闪烁的 LED 灯条可能会让人恼火，但有几种简单的解决方案可以解决这个问题。从检查电源到更换有故障的组件，这些故障排除步骤将帮助您识别并纠正闪烁的根源。此外，采取预防措施（例如使用高质量组件并确保 LED 灯带正确固定）可以帮助完全避免此问题。
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