作者：Blade

Sanan Optoelectronics plans to invest in Mini / Micro LED epitaxy and chip projects

On April 25th, Sanan Optoelectronics issued an announcement and announced that it had signed a project investment contract with the Management Committee of Hubei Gedian Economic and Technological Development Zone, with a total investment of 12 billion yuan.

Sanan Optoelectronics plans to invest in Mini / Micro LED epitaxy and chip projects

In order to promote the company’s III-V compound semiconductor project R & D and industrial base to settle in the Gedian Economic and Technological Development Zone in Hubei Province as soon as possible, Sanan Optoelectronics and the Hubei Gedian Economic and Technological Development Zone Management Committee adhere to the principles of complementarity and mutual benefit. After a friendly negotiation, a cooperation contract was reached.

The contract stipulates that San’an Optoelectronics will invest in an III-V compound semiconductor project within the jurisdiction of the Management Committee of Gedian Economic and Technological Development Zone in Hubei Province. It will mainly produce R & D, production and sales of Mini / Micro LED epitaxial and chip products and related applications. And invested by Sanan Optoelectronics in this jurisdiction, the total investment is 12 billion yuan.

Sanan Optoelectronics is a leading III-V compound semiconductor and integrated circuit company. It is a substrate integrated circuit, epitaxial, chip R & D and industrialization base. enterprise. It has a national post-doctoral research workstation and a national enterprise technology center and has undertaken a number of key research projects such as the “863” and “973” plans. Has been identified by the National Development and Reform Commission, the Ministry of Science and Technology, the Ministry of Industry and Information Technology as “National High-tech Industrialization Demonstration Project Unit”, “Semiconductor Lighting Engineering Leading Enterprise.” The national integrated circuit industry investment base is the second-largest shareholder of Sanan Optoelectronics.

Sanan Optoelectronics stated that Mini / Micro LED is one of the company’s key development directions in the future. This investment project is in line with the national industrial policy plan and the company’s industrial development direction and development strategy, which is conducive to improving the company’s product structure, enhancing the company’s core competitiveness, and consolidating the company’s industry position. All directors agreed to invest in this project.

LED lamp power deviation analysis

The high incidence of “quality gate” incidents in LED lighting products is, on the one hand, the lack of industry standards and supervision, and on the other hand, the company’s own quality awareness, weak design capabilities, and technical level defects.

LED lamp power deviation analysis

This article takes the LED lamp power deviation out of control as an example. The theoretical calculation combined with case calculations analyzes in detail the constant current accuracy of the driving power supply. The forward voltage drop of the LED affects the deviation of the lamp power for designers’ reference to improve the design quality of LED products.

Recently, various media have frequently reported national and local quality inspection departments to spot check LED light sources and LED lamps for substandard quality incidents. The high-quality “quality gate” incident has seriously damaged the company’s own image and the brand image of China’s LED industry on the international stage.

In the non-conformity test project, the actual test power of the lamp does not match the declared power of the product. As early as 2010, China has released the national standard GB / T24908-2010 “Performance requirements for self-ballasted LED lamps for general lighting” in Article 5.3, “When the lamp works at rated voltage and rated frequency, its actual power consumption and rated The difference in power should not be greater than 15% or 0.5W “, and the International Electrotechnical Commission also required in paragraph 7 of IEC62722-2 that” the deviation between the nominal value and the actual value of the electrical parameters of the lamp should not be greater than 10%. ”

The author believes that the reasons for product power deviation are as follows:

First, due to cost pressures, the production process cut corners and cut materials, eliminating the necessary product testing process, the unqualified products have not been removed in the factory and flowed to the market in good time.

Second, the LED lamp beads have insufficient cooling design margins. The assembly process and the deviation of the incoming materials cause the lamp beads to overheat, and the forward voltage drop (Vf) drops out of control, causing the actual power of the lamp to deviate from the lower limit.

Third, the optional drive power supply of the lamp has poor thermal stability and large output current temperature drift, which directly causes the lamp power to deviate in a wide range.

Fourth, in order to reduce the purchase cost of LED lamp beads, the LED Vf distribution BIN was not selected according to the design requirements, causing the actual power consumption of the LED to deviate from the design center value.

Fifth, the constant current accuracy of the optional drive power supply is low (usually 5% -8%), and it cannot adapt to the various Vf BINs of the lamp beads.

The author believes that the first three reasons directly reflect the manufacturer’s weak quality awareness and have little relevance to the design. This article does not review them. The last two reasons have a strong correlation with the precision design of the driving power of the lamp. The specific analysis is as follows:

Assume that the drive power accuracy (△ I) is 5%. To meet the IEC power nominal requirements, P is within 10%. According to the expression [1], the LED lamp string voltage deviation percentage (△ U) is about 4.8. %, Which means that the LED lamp beads Vf BIN must be screened strictly, which directly causes the invisible lamp bead procurement costs to rise.

For example, the engineer selects 12 lamp strings with a design center value of 36V for OSRAM LCW CRDD series lamp beads (Vf BIN table is as follows).

If a constant current accuracy 5% driving power source is selected, the minimum value of the voltage drop of the string is 34.27V and the maximum value is 37.72V.

It is not difficult to find the Vf BIN distribution table of lamp beads. Without effective measures to mix BINs, nearly half of the lamp beads cannot be used in mass production, and the purchase cost of lamp beads has increased significantly indirectly.

If a constant-current precision 1% drive power source is used, the minimum value of the string voltage drop is 32.79V and the maximum value is 39.204V, which completely covers the lamp bead Vf BIN, without any measures to mix BINs. Production costs and procurement costs are greatly reduced.

It is not difficult to see through the comparative analysis of the above cases that the high-precision drive power can effectively avoid the trouble of the lamp factory’s complicated and unpredictable proportion of lamp beads mixed-use, greatly reducing the overall system cost, and the “small cost” of the power source in exchange for the “big benefit” “.

LED lighting competition has become fierce, and product prices have continued to decline. Low-cost strategies at the expense of product quality or even violation of industry norms and regulations are not desirable. Technical personnel in the LED industry must explore low-cost solutions on the premise of meeting product quality requirements so that ordinary people can afford high-quality LED lighting products.

Is PoE lighting finally here?

PoE was originally used in a proprietary Voice over IP (VoIP) system developed by Cisco in 2000. Each new generation of PoE standards and technologies includes higher power specifications. At the same time, the efficacy of LED lamps is also increasing year by year. By 2017, the 25.5W limit stipulated by the IEEE 802.3at standard, which has now been replaced, is enough to power nearly a quarter of the lamps in the room.

Is PoE lighting finally here?

The IEEE Standards Council approved the IEEE 802.3bt standard on September 27, 2018, including some important improvements to LED lighting systems. The main driver of this improvement is the use of four pairs of network cables to transmit up to 90W of power over 100m of cable. This allows multiple fixtures to be daisy-chained, simplifying the installation process.

Other enhancements in the new specification include increasing the efficiency of current PoE levels (that is, 25.5W output power), as the power consumption of the cable is reduced by approximately half. For example, a power supply device operating under the previous standard needs to provide at least 30W of power to ensure that the powered device receives 25.5W of power, as Ethernet cables may lose up to 4.5W of power. Powering the same device under the new standard will reduce losses to below 2.25W and increase efficiency by about 7%.

In addition, power supply equipment can now determine the maximum power consumed by each connected device and set the output power accordingly, thereby improving the operating efficiency of the entire system. Finally, as the duty cycle required to maintain the power signature is reduced, the standby power requirement is now reduced, and the only 0.02W is required to maintain the power connection. Since energy efficiency is likely to be the most compelling selling point of LED lighting systems, changes to the new specification will help advance the development of PoE control systems.

The author recently visited Carthage, Missouri for a visit to H. E. Williams. The details of the PoE system are very instructive. As shown in Figure 1, a PoE lighting system includes five basic components: a network controller, a user interface, a PoE switch, lamps, and auxiliary equipment such as sensors or switches.

The data and power receiving of the luminaire is achieved by adding a “node” in the luminaire housing and connecting it to the power and dimming input of the LED light engine. Depending on the function of the connected luminaire and its associated auxiliary equipment, this node can also handle other functions. Igor’s nodes allow multiple devices to connect to a PoE network.

According to the new IEEE 802.3bt standard, Igor has made some modifications to its node shape to make it closer to the size of traditional LED drivers. Another great enhancement is the addition of a USB port, as shown in the bottom left corner of Figure 3.

As the number of AC-DC power conversions is reduced, PoE lighting systems can provide higher overall energy efficiency compared to traditional AC power systems. Ethernet cable loss appears to be a major consideration in assessing total system power consumption, and this indicator is especially important for end users who want to gain subsidies by improving energy efficiency.

“NEMA / ANSI C137.3-2017 Minimum Requirements for Installation of Energy Efficient Power over Ethernet (PoE) Lighting Systems” document provided Installation requirements. Specifically, the standard specifies a minimum wire gauge, which requires the average resistance wire loss to be less than 5% of the total transmission power (assuming an average cable length of 50 meters). However, because each installation is more or less different, the total loss must be evaluated on a case-by-case basis. There are no guiding standards for assessment methods.

Performance requirements for glass tubes for LED lamps

The performance of the straight tube type LED lamp housing glass tube mainly includes the appearance effect, light transmittance, fogging degree, temperature and humidity resistance, moisture resistance, hardness, conductivity, expansion rate, bending degree, and the color parameters of the entire light.

Performance requirements for glass tubes for LED lamps

Key indicators are as follows:

①Appearance effect: Generally the color is milky white, the surface is smooth, no bubbles, no scratches, no spots, etc .;

②Transmittance: Test calculation method, using the same light source at the specified voltage and power respectively apply transparent glass tubes and milky white glass tubes of the same specifications, using an integrating sphere to its photoelectric color parameter test, milky white and transparent light effect. The ratio is the light transmittance. Generally, the light transmittance is required to be above 92%;

③Atomization degree: Put the matched light source (lamp beads) device in the glass tube, light the lamp at the rated voltage and power, and you can’t see the light-emitting point (lamp beads). Consistent performance, no obvious difference between light and dark;

④Temperature resistance: Put the glass tube in a high-temperature box of 150 ℃. After 200 hours, there is no color change, no burst, no deformation, etc .;

⑤Water resistance: Put the glass in a constant temperature water bath at 60 ℃. After 24 hours, there will be no color change, no cracks, no distortion, etc .;

⑥ Expansion coefficient fluctuation: The expansion coefficient fluctuation of the same batch of glass tubes shall be controlled within ± 1 × 10-7 / ℃;

⑦Conductivity: The inner and outer walls of the glass tube are required to be non-conductive;

⑧Light color effect: milk-white glass tube and transparent glass tube use the same light source to test light color parameters, and the spectrum, color temperature, and color rendering index must not be significantly different;

⑨Hardness: Take T8 glass as an example, the general pressure required to test the vertical pressure using a general glass pressure gauge is greater than 300N, which depends on the customers of each manufacturer

⑩ Bend: Take T8-1.2 meters long glass tube as an example, the bend is generally not required to exceed 3 °.

Among the above properties, most manufacturers pay more attention to the influence of light transmittance, fogging degree, temperature and humidity resistance, and light color.

Shanxi will start spot lighting and lighting spot checks for classrooms

Following Sichuan and Hebei, Shanxi Province will also start the spotlighting of classroom lighting. It is learned from the Shanxi Provincial Health and Health Committee that recently, the national random inspection work of daylighting and lighting was held in Taiyuan City. Shanxi Province will “double randomize” the daylighting and lighting of schools, child care institutions, and off-school training institutions (teaching places). Methods for spot checks, records, and announcements.

Shanxi will start spot lighting and lighting spot checks for classrooms

Sampling content and scope

Childcare institutions. In accordance with the “Code for the Design of Nursery and Kindergarten Buildings,” the spot natural lighting, daylighting coefficient, window-to-ground area ratio, and illumination standard values of children’s playrooms in kindergartens will be spot-checked. With the county (district) as the unit, a random inspection shall be carried out according to at least 5% of the total number of childcare institutions holding a parking permit in the jurisdiction, but the minimum is not less than 5 and less than 5 of all.

Off-school training institutions. With reference to the “Lighting and Lighting Hygiene Standards for Classrooms in Primary and Middle Schools” and “Design Specifications for Primary and Middle Schools” regarding classroom lighting requirements and lighting requirements for classrooms, the lighting directions, lighting coefficients, window area ratios, The glare measures, indoor surface reflectance, and the installation of artificial lighting, desk illumination, blackboard illumination, lighting power density, etc., are spot-checked. With the county (district) as the unit, a random inspection shall be conducted according to at least 5% of the total number of out-of-school training institutions holding school licenses in the jurisdiction, but the minimum shall not be less than 5 and all shall be less than 5.

School. It is implemented in accordance with the national random supervision and random inspection plan for public health in 2019, and the random inspection is conducted with reference to the “Primary and Junior School Classroom Lighting and Lighting Hygiene Standards” and “Primary and Secondary School Design Specifications”.

Jiangsu Province issued “Guide to Construction of Smart Lighting Poles for Urban Lighting”

15th march this year, the Jiangsu Provincial Department of Housing and Urban-Rural Development issued the “Key Points for Provincial Urban Construction Work in 2019”, which includes the organization and compilation of the “Guide to the Construction of Smart Lighting Poles for Urban Lighting” to guide the orderly application of multifunctional applications for street lighting poles.

Jiangsu Province issued "Guide to Construction of Smart Lighting Poles for Urban Lighting"

On December 17, the “Guide to the Construction of Smart Lighting Poles for Urban Lighting” (hereinafter referred to as the “Guide”) was officially released for implementation, mainly to actively and orderly promote the comprehensive utilization of urban lighting poles in Jiangsu Province and strive to create a response to the construction of smart cities. “Smart light poles”, in-depth standardize and guide the planning, construction and operation and maintenance of smart light poles, beautify urban road environment, optimize urban space structure, reasonable operation, and maintenance costs, and promote high-quality urban development.

The guideline specifies the requirements for the overall planning and design of urban lighting smart poles, poles and lamps, mounting equipment, platforms, gateways and communications, layout and power supply, construction and acceptance, operation and maintenance. It is suitable for the establishment, planning, design, construction, acceptance, operation, and maintenance of smart lighting poles for urban lighting in Jiangsu Province.

The main functions of smart light poles include intelligent lighting, video surveillance, traffic instructions, traffic monitoring, environmental/meteorological monitoring, 5G communication, information release, public broadcasting, public, emergency help, information interaction, and charging services.

The guide shows that smart light poles should include poles, equipment bays, smart lamps, mounting equipment, and supporting facilities. The mounting equipment and carrying functions should be selected according to local needs and application scenarios.

Among them, smart lamps include LED lamps and single-lamp controllers, which can achieve remote centralized management and single-lamp control, dimming, and support the lamp’s operating status and power monitoring, fault alarm. LED lamps should meet the following requirements:

A) The safety of LED lamps should meet the relevant regulations in GB / T 7000.1 and GB / T7000.203;

B) b) The engineering design shall comply with the relevant regulations in CJJ 45, “Guidelines for the Application of Road Lighting LEDs in Jiangsu Province”;

C) c) The performance of LED lamps should meet the relevant regulations in GB / T 31832, GB / T 24827, GB / T 31897.1, GB / T 31897.201.

Mounted devices include, but are not limited to, the following functional devices: video cameras, traffic instruction equipment, traffic monitoring equipment, environmental / weather sensors, 5G base stations, LED displays, network sound columns, wireless WiFi, one-touch calling devices, information touch screens, charging Pile, etc.

Among them, the information display screen of the smart light pole should choose an outdoor LED full-color display, which is mainly composed of SMD small-pitch LED display module, power supply, controller and cabinet, which are divided into the single-sided screen and double-sided screen. The pixel center spacing of the outdoor LED display should be P3, P4 or P5, and connected to the smart light pole gateway through the RJ-45 network port. The center height of the LED display installation should not exceed one-half of the height of the smart light pole, and the bottom end should be greater than 2.2m above the ground.

The LED display should comply with the relevant regulations in SJ / T 11141, and its main parameters are as follows: a) Power supply: 220V AC; b) Peak power consumption: ≤1000w (single-sided); c) Weight: ≤50kg (single-sided); d) Display size: ≤800 × 1600mm, can be customized; e) Brightness: ≥5000cd / m2, and can be automatically adjusted according to ambient light.

CLP Panda Lighting recalls some LED bulbs

A few days ago, Nanjing CLP Panda Lighting Co., Ltd. filed a recall plan with the Provincial Market Supervision Bureau and decided to recall from November 20 this year to February 29 next year the electrician brand (QP22- LED09-01) LED bulbs, the number of affected products is 2200.

CLP Panda Lighting recalls some LED bulbs

The LED bulbs involved in this recall have the following problems: accidental contact with live parts does not meet the standard requirements, and accidental contact by consumers may cause electric shock; insulation resistance and dielectric strength do not meet the standard requirements, and when AC voltage is applied breakdown may occur and cause an electric shock to consumers.

Nanjing CLP Panda Lighting Co., Ltd. will inform the dealers in writing, telephone, etc., and entrust the dealers to notify consumers of the product recall through written notice. Consumers are kindly requested to stop using the products within the recall range immediately and contact the dealer or directly with the company to return or replace other products. The consumer will be responsible for the costs associated with this recall.

Suzhou Sanxiang Road lighting renovation and upgrade, the first new street lights have been lit

Suzhou Sanxiang Road lighting renovation and upgrade, the first new street lights have been lit

It is learned from the Suzhou Urban Management Department that the Suzhou City Lighting Management Office started the reconstruction project of Sanxiang Road (Qing Road-West Ring Expressway) road lighting facilities in the middle of this month, and the first stage of construction is about to be completed.

On the evening of July 26, the first batch of new street lights was installed and turned on. The street lamp completed on the evening of the 25th is located on the north side of the road 300 to 400 meters east of the Revolution Museum. The rest of the lighting facilities reconstruction project will be constructed in two phases. The reconstruction of the section from Tongyu Road to the West Ring Road will be completed by September 30, and the reconstruction of the section from Kushiro Road to Tongyu will be completed by December 30. Large-scale demolition and installation work is carried out between 22:30 at night and 03:00 in the morning.

Festive lanterns light up Malacca Raya

24 colorful lanterns symbolizing China’s 4 major festival totems are officially lit on Jalan Merdeka in the Melaka business district of Malacca, welcoming tourists who come to Malacca for tourism in 2020.

Festive lanterns light up Malacca Raya

The Chief Minister of State Adriah emphasized during the lighting ceremony for the lanterns yesterday that it was the City Hall A and the Melaka Merchants Association, which allocated RM100,000 and RM180,000 respectively to build the night of the entire street lively.

He pointed out that the lantern design that cost RM 280,000 was designed to symbolize the spirit of harmony and harmony of all ethnic groups in our country.

“The four major festivals include the Chinese Lunar New Year, the Malay Eid, the Indian Deepavali, and the Christmas celebrated by Christians and the Portuguese in Koshu. Malacca is also the commercial center of the city, and also Close to the tourist area, we believe it can become a new tourist product that attracts tourists. ”

He said that in addition to the lanterns, City Hall A also used 55 LED smart street lights for the main road. At the same time, 36 street lights in various streets and alleys in the Melaka business district were upgraded to LED smart street lights. The total cost was RM 114.985 million.

“Improving lighting equipment will help improve local law and order and increase the sense of security for businesses and tourists. We will also upgrade lighting equipment in other places.”

In addition, Adri said at a press conference that the drainage system in the Melaka district of Malacca has also been upgraded, and the local government will regularly monitor it and hope that business people will take care of the sanitary environment around the store.

He also revealed that the Melaka City Smart City Advisory Council, headed by City Councillor Qiu Peidong, has discussed smart parking plans such as the construction of multi-storey parking lots, and the state government has basically agreed to work on various locations suggested by the institute.

Smart lighting strategy starts with LED

Regardless of whether you are considering implementing an intelligent lighting system based on the Internet of Things, it is also wise to evaluate the most basic element in a lighting strategy: the light bulb. Incandescent bulbs are still widely used, but this is changing with the advent of LEDs.

Smart lighting strategy starts with LED

In essence, LED bulbs produce more light than traditional bulbs. When they first launched, they emitted more “cold” white light, and today they can provide the same natural “warm” light as incandescent lamps.

Many companies around the world have turned to LEDs, which can be easily installed in existing lighting fixtures in most commercial buildings. The reason for their installation is that LEDs save up to 75% of energy compared to incandescent bulbs, have a bulb lifespan more than 25 times longer, and generally produce better light quality than incandescent bulbs. In addition to saving money on energy use, many power companies also provide energy-saving subsidies as an incentive for companies to transform LEDs. Lighting retrofits are often considered the easiest to achieve results, as it can easily and immediately help significantly reduce energy consumption.

The LED lighting is not only suitable for office buildings, but also for almost all other types of commercial facilities:

Warehouses and industrial environments: Large venues like these benefit from LED lighting because they consume less energy, and LED lights can emit light in a specific direction (unlike incandescent and fluorescent lights).

Indoor farms: Some high-tech farms around the world are using LED lights to optimize plant growth. They do this by customizing light “recipes” and can influence the way plants grow and their taste.

Commercial parking: For security purposes, the quality of lighting is of paramount importance in indoor and outdoor parking facilities. In addition to saving money, security is also one of the reasons why parking lot lighting has become the fastest growing LED commercial lighting market.

Health care facilities: The design of health care facilities is partly for the comfort of patients. LED lighting helps to create the ideal light output for the environment while improving efficiency.

Correctional facilities: Correctional facilities have a variety of lighting needs, from cells and activity rooms to lounges and corridors. LED lights do not interfere with security and cameras, they maintain uniform, high-quality light, which improves visibility.

Educational facilities: LED lights are ideal for schools with limited budgets, and energy savings can be reused for technology and other educational resources.

Retail facilities: More and more retailers are using LED lighting to add beauty and visual appeal to their stores, creating a superior shopping experience. Proper in-store lighting can increase sales.
Because LED lights are naturally friendly to digital control, they are very suitable for IoT applications. IoT LED lighting is the ideal way to achieve maximum savings and gain valuable operational insights that can improve every aspect of your building management.