Application status of smart lamps

As an important part of smart home, smart lighting has entered the Chinese market since the 1990s. Because it was originally positioned as a high-end smart product, it caused a situation of high curvature and widowhood.

However, the rapid development of the domestic economy, increasingly mature lighting technology and some international brands, such as Dynalite, Lutron, Wielang, etc., entering the Chinese market have quickly promoted the development of this industry. Entering the 21st century, domestic intelligent lighting manufacturers and businesses have sprung up like mushrooms, and intelligent lighting has fully entered the application era.

At present, smart lighting products on the market have formed a series with a full range. Higher technical perfection is the Netherlands Philips. Philips hue series products use Zigbee wireless communication technology, in addition to providing basic LED lighting, let lighting create convenience for people's lives in more ways.

Users can remotely control the working status of Hue lights through mobile terminals or networked PCs. For example, the user can adjust the light on / off time, color, brightness, atmosphere change, flicker frequency, etc. according to his habits.

Hue also has the ability to sense the environment and self-learning. It can make colorful lights dance with your music. It can give you a beam of warm light when you enter the house. It welcomes you home. It can change colors and breathe. Remind you that it's time to sleep.

Philips' first launch in China was an initial package, which included 3 smart LED bulbs, a bridge and a free app installed on a phone or tablet. One bridge can support 50 bulbs at the same time. The APP can run on two platforms, iOS and Android.

The most representative of domestic manufacturers is Shanghai Langmei. Shanghai Langmei has cooperated with JD.com's technical team. The Langmeco series of smart ceiling lights developed by JD + Smart Cloud APP (Jingdong Micro Union) with local WIFI and 2.4G wireless communication technology have realized intelligent lighting management.

Development stage of smart lighting

The development of intelligent lighting has gone through three stages:

(1) Energy saving phase, this stage mainly completes the transition from incandescent lamps to LED lamps.

(2) In the automatic control stage, according to the preset parameters (such as time, brightness and color), "the appropriate brightness and color that meet the requirements at the appropriate time" is automatically realized.

(3) In the intelligent control stage, the concepts of artificial intelligence, cloud computing, big data and the Internet of Things are added on the basis of automatic control to realize remote intelligent control of lighting.

Basic analysis of mainstream smart lighting technology

The smart lamps on the market currently involve the following three aspects of technology.

Dimming technology:

The main method to adjust the luminous intensity of LED chips is to change their average operating current. Changing the average operating current generally uses the PWM (Pulse Width Modulation) method, that is, brightness modulation is achieved by adjusting the proportion of time occupied by the high level of the power supply pulse.

The color control usually adopts RGB (red, green, and blue) mixed light method, that is, different colors are mixed by changing the luminous intensity of red (R), green (G), and blue (B) LED chips. At present, mainstream lamps can call out 16 million colors.

Control and network communication technology

The intelligent controller is the core of the intelligent lamp. The intelligent controller usually uses a microprocessor as the core and has different network communication interfaces (such as WIFI, Zigbee, RS485, etc.). The intelligent controller receives user instructions through the network communication interface, and performs a series of actions according to the instructions to achieve light control.

For example, change the PWM value of the working current control signal of the red, green and blue LED chips to obtain a new lighting color. The network used by smart lighting generally refers to the Internet of Things.

Cloud computing and big data technologies.

In order to achieve more complex and more secure control, smart lamps and users are usually not connected one-to-one, but are implemented through cloud servers. The user sends the control instructions to the cloud server through a mobile app, WeChat platform, etc. The cloud server processes the instructions accordingly, and then sends the control instructions to the smart lamp.

In addition to remote control, the cloud server can also record the working status of the lamp at any time, including information such as lamp switching time, usage time, brightness and color, and even use big data ideas to implement self-learning functions and better serve users.