Green lighting: solar HBLED lighting solutions

Over the past fifteen years, energy demand has increased by a factor of ten and energy costs have risen by a factor of four. Power cuts and power rationing have been seen in the United States and other countries, and the situation continues to deteriorate as energy demand and energy production remain unsustainable. According to the latest report of the North American ELectric Reliability Corp, is expected in the next ten years, the United States alone, the demand for electricity will grow by 141000 MW, while the same period has confirmed that only new resources of only 57000 mw. This resulted in a 84000 MW gap, equivalent to the total power generation of the 160 large power plants.

According to the U.S. energy information administration report, power generation (most of the power supply for lighting applications) produced 37% of greenhouse gases, therefore, we should start looking for alternative energy resources, such as solar energy. Solar energy is a green technology, and the cost of electricity, geothermal or nuclear power generation is not so high.

In twenty-first Century, up to 300 million of developing countries lacked adequate lighting.

Reasons may vary, but may include purchasing power (too high), lack of infrastructure, supply and demand imbalance. Many families use homemade kerosene lamps

Or candle lighting. These dim, yellow, black smoke is very harmful to the light source, and not environmentally friendly. In the long run, they are more expensive than bright, white, solar powered high brightness light-emitting diode (HBLED) light sources.

Why choose HBLED for lighting

Longer life

The life of LED is longer than any other light source, and it has been used in many applications for more than ten years. They contain a solid technology similar to that used in the latest microprocessor, which has no moving parts, no brittle glass, no mercury, no harmful gases, no filament. There is nothing that can be broken, broken, shattered, leaked or contaminated. Unlike typical conventional light sources, LED does not appear to have a sudden failure or burn. LED light source will not stop working at any time, but the performance of LED will gradually decline over time. It is predicted that most of the LED after running 50 thousand hours after the average brightness is still the original brightness of 70%. For example, in the application of the light source 365 days a day, the use of the environment for more than eleven years, the use of the system for more than 12 years, only the initial brightness of the output of the attenuation (70% of the luminous flux maintenance rate).

Reduce maintenance costs

Due to the continuous use of LED based light source is ten times the conventional light source, do not need frequent replacement, thus reducing or even eliminating the cost of routine maintenance and regular replacement costs. In this key, modulation lighting application is particularly important, such as buoys, beacon, emergency exit lighting, backup lighting and safety lighting, they often need regular replacement lamp.

Higher energy efficiency

LED light source is more efficient than incandescent lamp and halogen tungsten lamp source. White LED per watt can provide more than and 20 luminous flux units, is expected to reach more than and 50 kilowatts per watt per unit. The overall advantages of the system level must be taken into account when selecting solid state lighting as a substitute for illumination. For example, because of the superior luminous flux per watt, the LED used in the building lighting system is less energy than the competing light source, which makes them more environmentally friendly and more economical.

Advantages of LED

Reliability (100 thousand hours) - reduced maintenance costs

Higher energy efficiency - green, cost-effective solutions

Open and fully adjustable light, no color change - pulse width modulation (PWM) control

No mercury - compliance with environmental regulations

Low voltage DC operation - no need for high voltage connections

Working principle of solar powered LED lighting

Solar panels convert solar energy into electricity and store it in batteries. With a two channel, a 16 bit timer Carle HCS08QG4/8 (MCU) is used for battery charging and monitoring, drive LED. PWM for battery charging, analog to digital converter (ADC) used to monitor the battery voltage. If the voltage drops below 50%, the brightness of the LED will be reduced to the level of PWM by changing the duty cycle of the spare channel. The aim is to provide a longer duration of illumination, even if the brightness is reduced. If the battery voltage drops to 10%, the MCU will turn off the LED to ensure that the battery is not fully depleted.

Select the right microcontroller

There are a variety of options when selecting MCU for solar powered LED applications. HCS08QG4/8 devices at a very competitive price, excellent combination of the required functions.

MC9S08QG8/4 will fly to the advantage of Carle HCS08 kernel extended to low pin count, small package options. QG device is a low voltage device, and its on-chip flash memory can be programmed as low as 1.8V. It includes all the standard features of HCS08 MCU, such as wait mode, multi stop mode, powerful simulation function, a set of serial modules, temperature sensors and powerful memory options.

application

Solar powered HBLED lighting can be used for street lighting, home lighting, emergency lighting and rural lighting.

Traffic lights are open day and night in most cities, and street lighting opens most of the day. The use of HBLED technology to replace traditional halogen lamps or energy-saving lamps (CFL) solutions can be achieved in terms of energy consumption and maintenance cost savings.

International Finance Corporation (IFC) is the World Bank Group's "light up Pyramid land" project of private investment