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Driven by the Green Olympics, the Chinese government promulgated the "Regulations on Energy Conservation in Public Institutions", which was officially implemented in October last year. The primary assessment indicator for home appliances to the countryside is energy conservation. Because rural and urban electricity bills are upside down, there are still many rural areas where electricity bills are more than 50% higher than cities. According to the survey data, the average standby energy consumption of urban households in China is equivalent to the use of a 15~30 watt long-lighting lamp by these families every day. The average standby energy consumption of various home appliances is between 15 and 30 watts. Therefore, the development of energy-efficient products has also become the goal pursued by manufacturers.
Long Wei, an marketing engineer of ON Semiconductor, pointed out that due to the increasing global energy consumption, in order to save energy and reduce consumption, the new energy-saving standards will be developed in the following directions: First, the standby energy consumption requirements are further reduced, aiming at the rapidly developing LCDTV. It is required that the standby energy consumption is below 0.1 watt at no load. The second is the efficiency improvement at light load and full load. For example, ATX, for 1/4 load, 1/2 load, full load efficiency requirements can reach 85%, 88%, 85%. The third is the improvement of power factor.
In order to further reduce energy consumption and save energy, some new energy-saving standards have been introduced. The Energy Star TV product version 3.0 specification, which came into effect in November 2008, aims to improve the energy efficiency of LCD TVs. This requires panel suppliers to improve panel performance, provide higher screen energy efficiency, reduce lamp usage and reduce energy consumption while providing equivalent light output. LCD TVs are now required to have a standby power consumption of less than 1W, which will soon be below 0.3W, and possibly even below 0.1W. TV energy performance that meets the new certification specifications has increased by 30% compared to older TVs.
The data shows that there are about 27.5 million TVs in the US market, consuming an average of more than 50 billion kilowatts of electricity per year, accounting for about 4% of all household electricity consumption. And this amount of electricity can supply electricity to all New York homes for a whole year. If the new standard is adopted, it can save $1 billion in energy expenditure each year and can reduce emissions equivalent to 1 million vehicles. The Energy Star 2.0 specification for set-top boxes is scheduled to take effect on January 1, 2009. The Energy Star 4.0 specification was introduced for computer power.
The increasing popularity of energy efficiency standards requires higher energy efficiency for all operating modes, including reduced standby (no-load) energy consumption, improved power supply efficiency, power factor correction (PFC), or reduced harmonics. Long Hao said that once the power management chip is selected, the topology and working mode of the entire power supply can be determined. In order to further improve efficiency, in addition to the optimized design, the selection of components should also be taken seriously. For example, the semiconductor device MOSFET and the output rectifier in the switching power supply should try to select the MOSFET with low on-resistance and the output rectifier with reduced on-voltage. Of course, in the case of high current output applications, if the output can be synchronously rectified, the efficiency improvement will be greatly helpful. In addition, the design and selection of magnetic components are also crucial, such as the design of the transformer, copper loss and iron loss are considered as elements.
He said that the latest chips from ON Semiconductor meet the new energy standards. The NCP1392 is an 8-Pin LLC controller that integrates multiple protection functions, making the design of the entire power supply simpler. The NCP1237 is a fixed frequency flyback controller that uses frequency back-off characteristics at light loads, integrated input over-voltage protection, over-power protection and other protection functions to meet the latest Energy Star 2.0 standards. The NCP1654 is an 8-Pin continuous mode PFC control device with input undervoltage protection and good dynamic response. As new products are introduced, the company is also promoting total solutions that incorporate the latest technology. For example, the secondary resonant synchronous half-bridge architecture uses a high-efficiency ATX power supply. Personal computer power efficiency trends are required to comply with the 80PLUS specification, which is 12% and 7% higher than the 68% energy efficient half bridge and the 73% dual switch forward solution, respectively. All of Amway's GreenPointATX load points are guaranteed to meet 80PLUSSilver energy efficiency requirements, and are suitable for use in various cities around the world. The 220W GreenPoint LCD TV reference design uses a half-bridge LLC resonant topology to fully meet the requirements of the Energy Star TV product version 3.0 specification. .
According to Long Xiang, with the development trend of thin and light electronic products, on the premise of energy saving and consumption reduction, ON Semiconductor will develop bridgeless PFC, interleaved PFC, and COMBO.
TI has also introduced a new 32-bit Piccolo series MCU. The Piccolo F2802x/F2803x controller replaces multiple electronic components to enable advanced power/regulator electronics management while reducing overall system cost. For example, in an inverter air conditioner, two electric three-phase motors can be precisely controlled by a single F2802x/F2803x controller, and power factor correction (PFC) calculations can be performed. Currently, about 30% of the global market, including Europe, China, Japan, and India, requires PFC, which improves load efficiency and makes better use of power. The Piccolo family of MCUs also enables real-time control to achieve higher system efficiency and precision by implementing advanced algorithms in industrial, consumer and automotive applications such as solar micro-inverters, LED lighting, large appliances and hybrid vehicle batteries. .
Fairchild recently joined the US Energy Conservation Alliance. The company said that electronic component manufacturers play a pivotal role in producing more energy efficient consumer electronics. Fairchild is committed to designing and developing products that reduce power consumption, increase battery life, extend product life, and improve power performance without increasing power usage. For example, the use of variable speed motors in home appliances and factory automation equipment can increase efficiency by up to 40% compared to single-phase motors. Electronic components allow the motor to be turned on and off at different speeds as needed. If 25% of households in the United States replace single-phase motor refrigerators with high-efficiency motors that use Fairchild components, the energy saved is enough to supply nearly 500,000 households in the United States for one year.
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