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Energy efficient power solutions to meet energy efficiency challenges

today, with the intensification of energy shortage and global warming, governments around the world are vigorously advocating sustainable development and putting forward various environmental directives. At the same time, the awareness of environmental protection has also become the consensus of consumers, who are increasingly concerned about small size, multi-function, energy saving and power saving. A recent survey in the United States shows that nearly 70% of American consumers are willing to spend more money on environmentally friendly and energy-saving products. This kind of design that meets the environmental requirements puts forward higher requirements for the power market

energy efficiency norms promote the demand for energy-efficient products

driven by energy efficiency norms and environmental awareness, the power market is undergoing tremendous changes. The global power supply market forecast in 2008 shows that the largest demand comes from multiple sources of computer electrical safety hazards, followed by LCD TV, electronic ballast and adapter power supply. With the continuous development of computer, LCD TV and notebook computer markets, the demand for high-energy efficient power supply for these products is also increasing day by day

government agencies and industry organizations all over the world have formulated corresponding energy consumption standards. In addition to "80 plus", the industry has also put forward new energy-saving requirements for computer power supply. For example, the computing industry climate rescue Initiative (CSCI) has put forward higher energy-saving requirements, that is, under 20%, 50% and 100% load conditions, the computer power supply should not only reach 80% in july2007, but also meet higher requirements in subsequent periods. In addition to the U.S. energy star, which will take effect on july1,2009 The computer version 5.0 specification, the "Energy Star" TV product version 3.0 specification and the "Energy Star" external power supply version 2.0 specification will also take effect on November 1, 2008. The increasing popularity of energy efficiency specifications and standards requires that power conversion in all operation modes have higher energy efficiency, including reducing standby (no-load) energy consumption, improving power efficiency, using power factor correction to partially disassemble and review equipment (PFC) or reducing harmonics

addressing the energy efficiency challenges of circuit segments

the challenges of energy efficiency specifications to circuit segments are mainly reflected in PFC energy efficiency, primary converter energy efficiency and secondary energy efficiency. To improve the energy efficiency in these aspects, it is necessary to improve the performance of the components in the red box of the circuit shown in Figure 1. Several ways to improve the energy efficiency of the circuit section are described below

figure 1 Improving the performance of the components in the red box in the figure can improve energy efficiency

1 Improve PFC energy efficiency

the goal of improving PFC energy efficiency is to achieve a short power factor correction efficiency of more than 96%. The use of bridgeless PFC (Fig. 2a) can reduce bridge loss, and the use of interleaved PFC (Fig. 2b) can meet the requirements of higher power applications to improve PFC energy efficiency. In addition, IC technology can be used to reduce switching loss, and more optimized topology can be used to reduce EMI filter loss

figure 2a Bridgeless pfc

figure 2b Staggered pfc

the ncp1605 energy-efficient standby mode PFC controller of ansenmey semiconductor can improve PFC light load energy efficiency and further reduce losses. The device adopts high-voltage current source, sets fixed switching frequency externally, and can work in dcm/crm mode; It can work in soft skip cycle under standby conditions; PFC ready signal can perform fast line/load transient compensation; Valley bottom conduction can realize overvoltage protection and undervoltage protection; At the same time, it also has the functions of input undervoltage detection, soft start of smooth start, overcurrent limit and latch

2. Improve the energy efficiency of the main converter section

the following methods can be used to improve the energy efficiency of the main converter. One is to reduce the primary conduction loss by reducing the conduction impedance (high switching loss) and/or reducing the primary peak current and root mean square current; Second, soft switching technology is considered to reduce switching loss; The third is to reduce the secondary loss by reducing the rectifier voltage drop (using low forward voltage drop diode or FET rectifier); Fourth, use better core materials to reduce core loss. Table 1 lists the topology of the main soft switches for reference in design. Table 1 Main soft switch topology

3 Improving secondary energy efficiency

synchronous buck converter is a good scheme to improve energy efficiency. Adopting DC-DC soft switching technology can further improve energy efficiency. The full load energy efficiency of the ncp4302 Synchronous Step-Down Controller of ansenmey semiconductor is 2.5% higher than that of Schottky diodes; The ncp4331 post regulator is 7% more energy efficient than the traditional magnetic amplifier, which can contribute to the improvement of secondary energy efficiency

energy efficiency reference design of ansenmey semiconductor

in order to improve energy efficiency, ansenmey semiconductor has provided several typical reference designs, which can respectively meet the energy efficiency trend of personal computer power supply and the requirements of improving the energy efficiency of LCD TV

reference design of personal computer power supply

the energy efficiency trend of personal computer power supply meets the 80 plus specification, which is 12% and 7% higher than the half bridge scheme with 68% energy efficiency and the double switch forward scheme with 73% energy efficiency, respectively. Anson semiconductor's 80 plus silver grade greenpointtm ATX reference design (Figure 3) is about 5% higher. All load points are guaranteed to meet the energy efficiency requirements of 80 plus silver, which is applicable to all markets around the world. See table 1

Figure 3 for details Ansenmey semiconductor's 80 plus silver grade greenpointtm ATX reference design

220 w LCD TV reference design

the "Energy Star" TV product version 3.0 specification, which will take effect in November 2008, aims to improve the energy efficiency of LCD TV. To this end, panel suppliers need to improve the panel, provide higher screen energy efficiency, reduce the use of lamps and reduce energy consumption while providing the same light output. Today's standby power consumption is less than 1 W, and will soon be less than 0.3 W, or even less than 0.1 W

the 220 w greenpointtm LCD TV reference design (Figure 4) of ansenmey semiconductor adopts a half bridge LLC resonant topology, which is efficient and compact. Its power factor shall meet the requirements of IEC specifications; Slim and energy efficient, η> 88%@ Vin=110 VAC; Low standby energy consumption, pin < 0.9 w@ pout=0.5 W, which can fully meet the requirements of the "Energy Star" TV product version 3.0 specification

figure 4 The reference design of 220 w greenpointtm LCD TV of ansenmey semiconductor

external power supply

version 1.1 and version 2.0 specifications of the U.S. Environmental Protection Agency for external power supply stipulate the activation mode energy efficiency standards, as well as the AC-AC and AC-DC external power supply activation mode energy efficiency standards, as shown in Table 2 and table 3. Table 2 EPA 1.1 activation mode energy efficiency standard

table 3 EPA 2.0 AC-AC and AC-DC external power activation mode energy efficiency standards

in terms of compliance with the above energy efficiency standards, compared with fixed switching frequency, fixed on time and fixed switching frequency reverse, the quasi resonant fixed on time (qr-fot) topology of ansenmey semiconductor has variable frequency (the lowest switching frequency has the highest power), the best light load energy efficiency, the best full load energy efficiency, and low electromagnetic interference (EMI). Therefore, it has become the best choice for wide output power range and high energy efficiency, helping to reduce standby energy consumption, optimize work efficiency and electromagnetic interference

in addition, ansenmey semiconductor has also launched a special series of fixed frequency PWM controllers, which can be used for external power supply. It adopts high-voltage current source, built-in input undervoltage detection and main power overvoltage protection. In addition, it also reduces the frequency in the light load skip cycle mode and has an adjustable over-power protection function. The classic series quasi resonant PWM controller can work at the bottom of the valley. It is hoped to find a new material to replace ABS before 2012. It has the bottom locking function, can also reduce the low frequency in light load and cycle skipping modes, and has the adjustable over-power protection function


the energy efficiency challenges faced by computer power supply, flat panel TV and adapter power supply are becoming more and more severe and urgent. As a complete solution provider, ansenmey semiconductor continues to develop new technologies to meet greater challenges and provide manufacturers with energy-efficient power solutions that can improve power efficiency and reduce standby energy consumption

the power solution design of ansenmey semiconductor complies with the requirements of the evolving global energy efficiency specifications (energy star, European COC, California Energy Commission (CEC), China Certification Center for winning the bid, and other international institutions, such as Australia's ago, South Korea's e-standby program, Japan's top runner program and Eco mark program). It is all this that has won the reputation of power saving king for ansenmey semiconductor

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