At present, there are about 654.38 billion incandescent lamps, which consume about one-fifth of the world's energy. With the current? Going green? Ecological trend, in order to save energy, many people are looking for new ways to save our planet. Solar energy, wind energy, water energy and other renewable energy sources are being built to replace environmentally harmful methods, such as coal and steam.
Another alternative to saving energy is to reduce energy consumption through smart grids and intelligent systems, and only consume energy when necessary. For lighting system, LED combined with intelligent sensor circuit seems to be a promising method, which can be used to solve the problem of high energy consumption. LED or solid-state light source (SSL) protocol consumes about one-third of the energy of incandescent lamps, and they are a more efficient way of energy utilization. Manufacturers already have such a solution.
Incandescent lamps continue to dominate the residential lighting landscape, although they are inefficient and can only convert a small part of energy into light. The rest of the energy is wasted and turned into heat through the glass cover and disappeared. Because incandescent lamps are inefficient, many countries in the world have begun to eliminate them. Australia and Venezuela are in the leading position at this stage, and the United States will start this matter from 20 12 to 20 14. Energy-saving lamps (CFL) have been put into use. They save 25% of household electricity consumption and generate less heat. In fact, a 20W energy-saving lamp can emit the same brightness as a 75W incandescent lamp.
At the end of 1990, consumers switched from incandescent lamps to energy-saving lamps, which was due to the discount mechanism for urban residents. What attracts consumers? Going green? , to achieve cost savings on the bill. However, for many people, this is not always a positive experience. For example, they want the lights to dim, but energy-saving lamps can't be adjusted by regulators. Energy-saving lamps contain a small amount of mercury, which needs to be properly treated. Many light bulbs will be recycled and disposed of properly, but most of them will be buried in garbage dumps, which will lead to groundwater pollution. The adoption rate of energy-saving lamps is very low, and it is estimated that only about 1 1% of households in the United States use them. The technology of energy-saving lamps has been greatly improved in the past five years, but there is still no optimal solution.
With the development of semiconductor lighting (SSL) technology, LED lighting equipment in commercial and residential markets has increased rapidly. The promised long life, better luminous effect and more energy saving are the main factors for LED to replace incandescent lamps and energy-saving lamps. LED only needs to consume one third of the energy of its predecessor incandescent lamp. It can make full use of intelligent sensors and microcontrollers, and really bring additional energy saving and economic benefits. Is it true? Green? Technology. Some experts predict that in less than a year, most consumers will be willing to use LED lighting.
In the next few years, the lighting industry will usher in a critical moment in the history of lighting, and many States in the European Union, Canada, Brazil and the United States will gradually take measures to withdraw incandescent bulbs from the market. Local utilities in the United States have begun to introduce LED lighting incentive plans, which will accelerate the adoption of LED lighting. These incentives will make up for the high cost for consumers to buy new lamps, which is about five times the cost of energy-saving lamps.
The Lighting Science Group (LSGC), headquartered in Satellite Beach, Florida, recently announced that it will provide customers with public utility discounts under the public rescue plan in the renovation of old industrial bases in Northeast China, new buildings and other user applications. According to the press release of LSGC, the reason for the selection is based on their strict LM-79 lighting performance test on the LED lamp definition line, rich mass production series and shoe box fixtures. These concessions in Northeast China will definitely reduce cost barriers and increase the utilization rate of consumer LED lights.
At present, the cost of LED lamps is mainly composed of LED, electronic drive, optics and radiator. Many LED lighting equipment manufacturers are trying to reduce costs and increase functions to attract consumers. Others are trying to add intelligent control, which can be easily integrated into LED-driven electronic devices.
Most LED lighting equipment uses electronic control to control the light output of LED through pulse width modulation (PWM) technology. Are these PWM controlled by led? Open? Controls the percentage of time that the light output is generated. This driving method can also dim the LED, which can be used in conjunction with traditional dimmers on most home walls. The electronic drive inherent in the design can also be used to further control the function of light output. Sensors are ubiquitous, which is the key to determine when and how much light is needed, so LED lamps provide the best effective output.
Intelligent microcontrollers have been greatly enriched in today's market, and most of them can be programmed to perform various intelligent LED driving functions. Every day, many new integration schemes come out, and driver manufacturers are committed to reducing the number and cost of BOM components for customers. Ideally, these products can provide design engineers with a single-chip solution, including all the modules needed to build intelligent LED drivers. PowerPSoC now integrates Cypress's programmable system on chip (PSoC), including CSA, hysteresis controller, 5v DC regulator and power FET, forming a single-chip integrated circuit. System-on-Chip (SoC) is the design basis of lighting function. It gives designers a platform to drive design, which can meet all the market demands expected by their company. Using this integration scheme, the power supply can be reconfigured, the hardware design can be simplified, the test time can be reduced, and the BOM cost can be reduced. PowerPSoC can provide designers with both digital and analog I /O, and there are many sensor interfaces to choose from.
Figure 1. Cypress's PowerPSoC has a special energy consumption circuit for LED driving, and the maximum energy consumption of each circuit can reach 1A, 32V. The onboard controller also has digital and analog I/O, which can connect most sensors to its internal A/D converter.
Programmable lighting has existed for many years, and sensors are used to determine when to turn on, turn off or adjust to the appropriate brightness according to environmental conditions. Because many LED panels already have electronic controllers, these sensors can be easily connected or integrated into intelligent subsystems. These sensors can be used to control a single lamp or control the complex lighting of the whole building. It has a wide range of applications, such as using light sensors to control LED spotlights in the driveway, and using sensors in commercial office buildings to reduce energy costs.
Sensors can be easily integrated into intelligent lighting systems, and can be connected to required processors, such as PowerPSoC. At present, one of the most technologically advanced LED bulbs on the market is developed by a company named MSiSSL(www.msissl.com) from southern Florida. The intelligent PAR38 or iPAR-38 is connected to the PowerPSoC using a Hall effect sensor to determine the output current required by the user. The Powerband technology patented by MSiSSL can have flexible light output based on 10W, 12W and 16W by using simple band mode. ? Retailers' shopping malls have different lighting needs. Can this product reduce power and save energy where light is not needed, or can it increase lighting where strong light is needed? John, vice president of sales at MSiSSL? Burke said this.
MSiSSL intelligent iPAR-38 is one of the most intelligent LED lights on the market today.
Depending on the position of the magnetic ring, iPAR38 can output 550 lumens, 650 lumens or 800 lumens. This will optimize the design of lighting specifications, whether it is light output or energy saving, all of which are realized on one light bulb.
MSiSSL intelligent iPAR-38 is one of the most intelligent LED lights on the market today.
The Powerband technology of MSiSSL is realized by using the Hall effect sensor in Cypress PowerPSoC to determine the number of lumens driving LED.
Ambient light sensors, such as NOA 1302 from Anson Semiconductor and SFH57 1 1 from OSRAM, can be used for LED street lamps, which are turned on when the sun goes down. These photodiode sensors have spectral sensitivity similar to that of human eyes, and can be used to accurately adjust LED light output. The output of these sensors is analog voltage, which can be easily connected to the A/D converter in Cypress PowerPSoC. Alternatively, NOA 1302 can integrate ADC on the board and control and communicate through I2C programming of PowerPSoC. The use of ambient light sensors and microcontrollers can be used to output appropriate bright light according to natural light.
Motion detector is another type of sensor, which can be integrated into office buildings, security systems and warehouses, and will only be turned on when there is motion. Active motion sensors can be used in the following situations: a beam of light is injected from a transmitter into a receiver, and differences are detected when the beams cross. Passive motion sensor, also known as PIR (passive infrared) sensor, is usually used for safety lights that can detect human body heat.
The device itself is a simple electronic component, similar to a light sensor. The infrared lamp circuit can automatically detect and amplify it into a signal. Passive infrared sensors are used to detect the presence or occupation of objects.
Dual passive infrared sensor for accurate motion detection
Recently, the report released by the US Department of Energy (DOE) shows that sensor-based LED lighting equipment does save energy in many lighting projects. One of the projects is the T.J.Maxx parking lot in NH, Manchester, where there are 22 high-pressure sodium lamps, 6 metal halogen lamps and 25 LED lamps. The report emphasizes that 58% of energy saving is due to the use of LEDs and sensors, which can reduce light output when there is no car. Running in downtown New Hampshire, the payback period of the application is estimated to be about three years.
The lighting science team recently reported that they have installed led wall lamp brackets in the single dormitory of the US Naval Base in Ventura County, California. These outdoor lights are specially designed for border security lighting, and with sensors, they can properly manage energy use. LSGC's press release reported that? This kind of lighting will last three times as long as traditional lighting, but it will consume less than half of the energy? . Also announced? In order to save extra energy, each lamp holder includes an onboard sensor to reduce the wattage of the lamp holder. When no activity is detected for a certain period of time, the optical output power can be reduced from 35 watts to 10 watts. .
Now there are various additional control sensors and logic, which will further improve the ability of intelligent lighting controller to save energy worldwide. Temperature, humidity, pressure, sound and ultrasonic sensors constitute all available sensors today, and they can be easily connected to intelligent lighting drivers to determine whether the light output of the system is needed.
With the growth and popularization of LED lighting in the next few years, its inherent efficiency will reduce the energy consumption and cost of the whole earth. We will continue to see more and more multifunctional lighting equipment, we can see colorful skyscrapers dotted with landscapes, and we can add more sockets to our homes. LED opens up many new lighting development opportunities, which incandescent lamps can't achieve. It will make full use of intelligent microcontrollers and sensors to ensure that we? Smart? Use energy wisely and really use it? Green environmental protection? The benefits of this era have arrived. Many existing and newly established lighting companies are pursuing green and will bring real benefits to the market in the next few years? Green? Intelligent lighting.