Portable Device Information B

Integrated LDO and DC / DC regulator balance between efficiency and size of the program

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Phone's baseband processor to use the traditional LDO linear regulator power supply, the advantage of a variety of conditions, the output of the noise bias is low, fewer external components, small size, easy to use, disadvantage is low efficiency, but efficiency with chips group to reduce voltage drop. With the functions of cell phones increasing demand for power, designers are using DC / DC regulator to replace the LDO, in order to improve efficiency and maintain battery life. Although the DC / DC regulator provides an efficient alternative, but it is to be the ideal power management devices, need to address the size, noise and switching losses larger issues.

Fairchild Semiconductor Bruno Kranzen manager said that as the battery energy or capacity would be difficult with the rising power requirements, and therefore a smaller form factor to provide more efficient DC / DC conversion is a valid approach, in these systems There is a Switching DC / DC Regulators alternative to linear regulators trend. "

For example, Fairchild's high-speed switching DC / DC regulator FAN5350 switching frequency of 3MHz, designed for handheld applications core processors designed to power. ADI's ADP2102 is a 600mA, 3MHz step-down regulator, and micro-ceramic sensors and capacitors can still be co-existence of up to 93% efficiency.

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ADI's director of marketing for portable power products Arcadio Leon, said: "improve the frequency can use smaller capacitors and inductors, thereby reducing the footprint area, but because of increased operating frequency also reduces the overall system efficiency, so the next challenge lies in the operating frequency and found between the shape factor of an ideal balance. "With the increase of switching frequency, DC / DC regulator efficiency benefits will be greatly reduced. 2MHz frequency DC / DC switching loss caused by total loss of 20%, but in the 8MHz frequency, switching losses to rise to 40%.

Clearly, a balance between efficiency, size and cost approach is a combination of switch-mode DC / DC regulator and LDO's new power management IC, they have the former high-efficiency, and the latter's small size and ease of use advantages.

For example, Micrel's recently announced power management IC MIC2800 provides three voltage output: a switch-mode DC / DC regulator output, two LDO outputs. On-chip 2MHz DC / DC regulator provides up to 600mA of current efficiency of 93% or more, just miniature 2.2μF output capacitor and a 2.2μH inductor to stabilize the voltage. The company's power products Ralf Muenster, director of markets and applications, for example, in the digital multimedia broadcasting (DMB) applications, the use of a LDO voltage of the lithium-ion battery is converted to 1.8V (for I / O power supply) and 1.2V (for core power supply), effective rates were 50% and 33%, while the use of integrated MIC2800 in the DC / DC regulator will be lithium-ion battery voltage down to 1.8V, the efficiency of 93%; and then integrated into the MIC2800 in the LDO will be 1.8V is converted to 1.2V, the efficiency of 66%. Other LDO provides a third output voltage, such as the RF voltage of 2.8V rail.

Micrel's director of power products markets and applications Ralf Muenster.

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ON Semiconductor's NCP1526 Dual-Output DC / DC regulators are also integrated 3MHz step-down switching regulator and LDO regulator for the digital multimedia broadcasting (DMB) chip set or a WLAN module in the digital core power supply circuits and RF circuits. This has a number of DC / DC regulator and the LDO output power subsystems will help resolve the clamshell or slider phone board layout, reduce the PMU to flip from the motherboard PCB power alignment, reduce the EMI issue.

ON Semiconductor Product Marketing Manager, Jia-Han also said that power management devices should not only significantly improve full load of work (the current benchmark of 90%), the power conversion efficiency, reduce the time needed to standby (the current benchmark for the 1uA) state of the energy consumption. For the DC / DC regulators, the technology development trends will be used more in the PWM mode and pulse mode (to replace the pure PWM mode) between automatic conversion in order to save power consumption under light load of work.

LED backlight and flash applications, the power demand

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Almost all of the portable consumer electronics products are available in color LCD screen to display the users need different types of information and data. LCD's backlight is usually led by a white light to provide. In addition, many mobile phone also has a high resolution can capture still images and video images of the built-in digital cameras, camera performance improvements also had a right for the camera in indoor or dim ambient light conditions, the use of high-power white LED light source demand. These are spawned by a compact, efficient and low-noise way to serve the needs of those LED power supply.

White LED power supply ic usually charge pump and DC / DC regulators, the main difference between the two is the need for an inductor (magnetic components). For the low-load current must be provided in the space-constrained applications, the charge pump is an ideal choice because they use small-outline package, the required external components is very small. Most step-up DC / DC regulator is designed to provide a white LED backlighting for the efficient and designed for constant current drive.

"LED Power Supply IC technology trends is to integrate digital control interface to enhance operational flexibility, such as the LED backlight dimming control." Jia Han said. Semiconductor charge pump NCP5602/5612/5623 support multiple modes of voltage conversion, with a more optimized power conversion, and in lithium-ion battery peak efficiency in the initial stages of the work of up to 90%, the average efficiency of 85%. These devices are integrated into a digital control interface (single or I2C), to achieve LED dimming control. NCP5608 multi-mode charge pump LED drivers, both driving up to four LED in order to support the main screen and sub-screen backlight function, also provides high-current power supply, output current up to 400mA, to drive the 1W of the LED.

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Linear Technology's LTC3208 is a non-inductors, high current, the software can be configured to multi-display | Display LED controller capable of driving 17 LED. The device contains a 1A high efficiency, low-noise charge pump may be the main sub-displays for mobile phones, a camera LED display and an LED display of the auxiliary power supply. Because the devices have up to 95% efficiency and an I2C serial interface.

"If you only need a small LED backlight panel can, if the 3.5-inch LCD screen will also need to bias. For small panel applications, LED drivers and can be integrated with the LCD bias, but for large panel applications, integrated LCD bias on the more difficult. "Hsin-Tsung Ho Lung said. TPS65120 converter for portable electronic devices to meet the lcd module all the necessary power requirements. Single-piece four output inductor DC / DC regulator for smart phones, PDA, portable DVD players, digital cameras and other portable applications in the amorphous silicon (a-Si) and low-temperature polysilicon (LTPS) displays provide bias power supply .

High-power LED flash brightness is to obtain high-quality pictures a factor. In some cases, the camera phone is used to drive the LED brightness by the high-power LED step-up DC / DC regulator efficiency limit. This is because the amount of current draw from the battery is limited, so high-efficiency LED would provide a higher power. Arcadio Leon that: At present, the new sensor-based lighting solutions, has a unique dynamic current management capabilities, which makes the system architecture engineers to maximize the supply of LED current, thus increasing the brightness and significantly improve the picture quality.

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ADI's ADP1653 is a dual-sensor-based high-power white LED driver, which can provide efficient than a single or low-intensity white led driver a higher camera flash, which makes them available in low-light conditions to achieve higher picture quality. ADP1653 peak efficiency of 92%, lithium-ion battery full voltage range of the typical efficiency is higher than 80%. Than the charge pump solution 40% efficiency, its efficiency is greatly improved.

The device uses a unique current management techniques, even in the battery to work simultaneously to multiple mobile phone functions (such as PA and LED flash) the case of electricity supply can be guaranteed picture quality. In order to reduce battery current overload, LED flash current is transmitted in the cell phone automatically adjust the RF signal, so that system design engineers to increase the LED drive current, do not have to worry about the system due to transient load the battery to shut down prematurely.

Linear Technology's LTC3454 is a camera designed for the high-current applications to optimize the efficiency of lighting, LED current control accuracy and designed products. LTC3454 is a synchronous buck - boost DC / DC regulator designed for the use of single-cell lithium-ion battery up to 1A of current to a single high power LED driver optimized. According to VIN and LED forward voltage, the device can be synchronous buck, synchronous boost and four-switch buck.

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Water fuel cell phone

High-tech fuel cell materials - water, fuel cell phone would be this life!

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Water fuel? Right! Have not you heard wrong, that is, water as fuel. Samsung is currently developing a micro fuel cell can be directly converted to hydrogen using water. This is so what's the do cherish? Alkali Kim Family (periodic table 1A) of metal with the water, stir together, do not have hydrogen can it? that courage you gave me to try sodium dumped into the water.

Certainly, this concept of product should not be used in such a strong activity in metal (perhaps with the oxide, but no sources, said commercial secrets?), But the principle is such a direct, metal in contact with water produces hydrogen gas, hydrogen in fuel batteries, and oxygen in the air role, the release of energy (it should also use a more moderate approach to oxidation of Health is able to), and finally is received 3W of electrical power output, while a certain quantity of water supply, probably enough to the general hand-held unit (currently used in cell phones) to play a ten hours.

At present some of the only drawback is that you must put the storage of hydrogen every few days to replace a small container (if it is used four hours a day, you'll replace one every five days time, this Xiaobian guess may be Excessive accumulation of unreacted oxygen sake), the future is the hope that they can save that person's step is annoyed. For the year 2010 can be formally used in the product to it? Let's wait and see!

When the notebook also has access to the fuel cell?

Fuel cells have been used in the PMP on the: HSTNN-IB09 , HSTNN-LB31 , 417066-001 , 395789-001 , HSTNN-OB53 , HSTNN-OB77 , etc.

This station PMP eat all methanol (methanol), and can through natural evaporation of the way to disperse water vapor, of course, there will be fuel capacity of instructions, reminding the user that the increase of fuel, and at the same time the fuel cell is said to be able to continuously play 1seg format film up to 10 hours, the current optimistic view of the Lok Toshiba time-table is scheduled to be installed in 2008 on products I do not know that time apart from Toshiba's own products, who could enjoy such benefits?

Japan's four major groups, to agree on new standards for lithium batteries

The battery for the ongoing security problems in late August, Japan Electronics and Information Technology Industries Association, the battery industry will, of Information and Communications Industry Association and video network equipment industry will have begun to cooperate in establishing technical standards for safe use of lithium batteries. According to reports, these industries Association involved in notebook computers, mobile phones and digital cameras and many other industries.

Previously, in order to ensure the safe use of lithium batteries, Japan Electronics and Information Technology Industries Association and the battery industry, has been co-developed the "the safe use of notebook PC batteries Manual." In the future, these four large groups of the manual is expected to grow as the basis for the relevant standards discussion. According to another report, the Japanese economy, Trade and Industry is considering lithium batteries designated as "Consumer Product Safety Act of living" the specific products and will help the industry groups to develop technical standards.

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Industry sources pointed out that the explosion was mainly due to mobile phone battery causes, the use of poor quality or poor-quality battery charger, battery charging time is too long, high-temperature or short-circuit could cause an explosion. Compared with the cell phone explosion, notebook battery problem is even remarkable universal, Sony, Dell and other international brands have occurred due to battery problems caused by fire events, while the notebook manufacturers to recall events of the battery in question is not uncommon in recent years.

In 2020 will become China's third largest wind power, wind power market to accelerate expansion

Internet access prices in wind power increased "rationalization" of the background, the wind power market is accelerating expansion.

Yesterday at the 2007 Shanghai International Wind Energy Conference and Technology and Equipment Exhibition news conference, said Li Junfeng, vice chairman of the Global Wind Energy Council is expected to the end of 2010, China's wind power installed capacity to break down 10 million kilowatts, is expected to reach 12 million, or 1500 kilowatts.

It is reported that as of June 30, 2007, the National completion of wind power installed capacity of 1 million kilowatts, the cumulative installed capacity of 360 million kilowatts. End of this year is expected to add 2.4 million -260 million kilowatts. September of this year, China released "Renewable energy and long-term development planning "of the 2010 installed capacity of 5 million kilowatts of wind power target, you can ahead of three years to complete.

"According to capacity to position two years ago, China's installed capacity of wind power the world's No. 8, No. 6 last year, and this year up to No. 5." Global Wind Energy Council (GWEC) Secretary-General Sawyer (Steve Sawyer) in the above news conference.

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He expects wind power market will continue to grow at a rate of 20%. By 2020, the global wind power installed capacity will reach 1000GW, the world's total power generating capacity accounts for 10% to 12%, and thus a corresponding reduction in 1.5 billion tons of carbon dioxide emissions.

Li Junfeng revealed that this year China's wind power installed capacity has been added after the United States (5 million kilowatts) and next year will be closer to the U.S. installed capacity.

At the end of September, Inner Mongolia Autonomous Region to complete one million kilowatts of wind power installed capacity is expected to 2010, the autonomous region of wind power installed capacity is expected to reach 5 million kilowatts.

Energy Development Office of Shanghai Municipal Development and Reform Commission at the meeting also said Fang, Shanghai has built capacity of 2.44 MW wind power. 2010, Shanghai, wind power installed capacity will reach 200,000 MW -30 . Among them, on both sides of the East China Sea Bridge, the construction of 10 electric field thousands of Wahe the upper hand in 2010 Shanghai World Expo will be completed. Shanghai will also be in Nanhui, Fengxian, etc. plans to build offshore wind farm.

Li Junfeng, China's wind power development in long-term goal is that after 10 to 15 years of preparation, about 2020, making wind energy into thermal power, hydroelectric power generation after the third-largest conventional power supply, at least the capacity of 70 million kilowatts, to actively create conditions for realization of 100 million kilowatts, accounting for 10% of power generation capacity by then.

By 2040 or 2050 to achieve 500 million or 10 million kilowatts, in the then installed capacity and electricity generation accounts for more than 20%.

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The blog post via: Silica Crisis.

China Sunergy into Laptop battery solar cell production capacity litigation crisis can not be honored

Explosion of silicon solar energy industry is expected crisis casio battery.

Robust in much of the domestic solar energy industry, when suddenly heard discordant voices. Recently there have been media reports in May of this year has just been listed on Nasdaq and Power Electric (Nanjing) PV Co., Ltd. (CSUN), its stock price declines, U.S. investors send China Sunergy court.

China Sunergy face litigation in the U.S. behind China’s solar energy industry, the collective madness behind the enormous hidden – in the casio np-100 battery , casio np-20 battery industry revealed that more than half of solar cell production capacity (700 MW) due to shortage of silicon materials can not be honored, of raw materials in various solar energy companies suffered a widespread tight bottleneck.

Silicon material enterprise losses caused by high prices casio np-30 battery.

China Sunergy head of the Ting-show may not think of their own solar halo behind it so quickly cast a shadow. Two months after landing the Nasdaq, the stock losses due to the company announcement issued a slump. In two months, the company has suffered a U.S. investor litigation.

Some media reports with casio np-40 battery , casio np-l7 battery, September 7, an investor will China Sunergy to court on the grounds that China Sunergy in his book, there is the registration fraud and false statements, allegedly for its “measured by production capacity, is a a leading solar cell manufacturers, “was strong growth in sales revenue, and claimed that it had to ensure adequate supply of polysilicon. The report also said that China Sunergy and corporate executives, chairman of Ting-Xiu Jian-Hua Zhao, Qi Shao-feng, ZHANG Feng-ming and other individuals were named as defendants.

Proceedings from China Sunergy in a paper bulletin, China Sunergy August 24 this year, issued a public notice that its second-quarter net profit from last year’s 1.84 million U.S. dollars per share American Depositary Shares (ADS) 9-US points to a net loss of 3.54 million U.S. dollars a share, 14 cents. Shares fell from 16.7 U.S. dollars per share of around 5 U.S. dollars.

The insider to the “China Times” reporter revealed that in China Sunergy CFO Qishao peak after, CEO has also been left by the former vice president of NEC Corporation Allen took over (in Chinese known as Run-Sheng Wang dell inspiron 630m battery , dell inspiron 640m battery).

“’s Loss was largely due to the price of raw material procurement to be a little higher than other companies, while former members of the company is relatively overstaffed.” China Sunergy an anonymous person in charge of the World Solar Energy Conference held recently to accept the “China when the newspaper, “an interview, said:” Because we have no long-term and stable raw material suppliers. ”

As the main raw material for solar cells, polycrystalline silicon and monocrystalline silicon have been in short supply, the global solar energy companies are facing raw material shortage. The person in charge of raw materials in 2001 from 30 U.S. dollars / kg or so, rose to the current 300 U.S. dollars / kg. with dell inspiron 600m battery

, “The company’s cost pressures are significant, not only that, even if the price is so high it is difficult to buy raw materials. Because we are facing this problem.” The person in charge further stated.

700 MW of capacity can not be honored

“2006 China solar energy companies production capacity has reached 1,200 megawatts, but actual production is only 500 megawatts.” According to the disclosure of the above-mentioned person in charge of domestic solar cell production capacity, more than half of the reasons for the supply of silicon material in a shutdown state dell inspiron 500m battery , dell inspiron 510m battery.

Obviously not just China Sunergy encountered a bottleneck, solar companies are more or less the existence of such conditions. Even the first overseas listing of domestic solar PV companies – Suntech, he was unable to avoid.

“Suntech also true that there is problem of the shortage of silicon materials, because our capacity expansion more severe.” Suntech Marketing Director Wu Hongyan accept the “China Times” reporter, said: “But we have with other companies have not, we have a stable supplier dell inspiron 1520 battery. ”

It is understood that by the end of July this year, Suntech with the world’s ten largest suppliers of silicon, the United States New York Stock Exchange Main Board-listed MEMC signed a silicon supply contract. The two sides agreed, MEMC will be in the next 10 years, providing value to Suntech over 5 billion to 60 billion dollars in solar-grade silicon.

“Suntech’s total supply of silicon material, the long-term contracts accounted about 70% of the ratio of 30% of the other.” Wu Hongyan, said last year, Suntech’s output is 320 megawatts, ranked third in the world. Nevertheless, Suntech also failed to go full steam ahead last year, its actual production capacity dell inspiron 1521 battery has reached 480 MW.

By contrast, other companies do not have such good luck. Newspaper reporters in an interview with the World Solar Congress a number of solar companies, solar companies have said the pieces of silicon materials has been a headache.

“Silicon is expected to be around 2010 the problem can be resolved dell inspiron 1721 battery.” China Merchants Securities analyst Wang Sheng told the “China Times” reporter, “the face of huge market demand, many companies are actively to increase production.”

It is understood that this year, China has launched several companies threatened to polysilicon project. Daqo Group, Jiangsu, Sichuan, Tong Wei Group, Shaanxi Nonferrous Metal Group dell inspiron 6400 battery , Jiang Xi Sewei LDK will be launched thousands of tons of the size of polysilicon, particularly among the most eye-catching Jiang Xi Sewei LDK. The company said it will invest 12 billion yuan to develop 15 thousand tons polysilicon project.

“Today’s technology dell inspiron 1720 battery , primarily in the hands of Europe and the United States, China has yet to master the polysilicon production technology.” Wang Sheng said, “Although part of the silicon material to produce a little polysilicon manufacturers, but the amount is very small. They mainly use Russian technology, but the Russian technology and techniques vary widely in Europe and America. ”

“Once the technical success, raw material problems will get through.” China Sunergy person in charge of the case of the above-mentioned prospects of China’s solar energy dell inspiron 6000 battery business development prospects.

This article via: Electronic Waste Battery Information.

Members of the public Laptop battery can not sell even afraid to throw a dilemma

Recently, this reporter visited China Tianhe City Square and a number of mobile phone sales store in the random access of the 10-odd members of the public, no one knows mobile phone batteries should go to which body waste recycling. A just bought a new phone of people told reporters that his old cell phone had already sold out, but the old fujifilm battery is Retention. He has to ask whether some small shops selling batteries, the answer will be: “can not make money, do not.” Nobody wants to sell they want to lose fear of polluting. Even members of the public waste mobile phones and batteries to make toys for the children.

The reporter asked the cell phone store sales staff, most of the sales staff have expressed their own shops do not waste battery recycling is also not clear if any departments are managing the issue. Only in China Square, a four-layer a well-known cell phone manufacturer’s customer service center, the reporter was in the customer lounge, a corner to find a recycling box. At that time, apart from a phone box outside the fujifilm np-100 battery , fujifilm np-120 battery is that many of the paper. To the staff, the box placed in a long time, basically no one noticed, but no one puts inside the battery discharge.

Sanitation Bureau in April last year, after the mobile phone battery is no longer received the

Is there a departmental recycling of waste batteries do? In May 2004, Guangzhou major media have published a message: Guangzhou sanitation department will be responsible for the collection of used cell phone batteries, this first of its kind to open in the nation. However, reporter yesterday that the move has been terminated last year. Guangzhou City Environmental Sanitation Bureau of Sanitation Director bowron Army, told reporters before the sanitation department did send someone to collect mobile phone waste batteries, but in April last year, after no further work in this area. The reason is, according to last year, April 1 implementation of the “The People’s Republic of China Solid Waste Pollution Prevention Law,” such as mobile phone fujifilm np-140 battery , fujifilm np-150 battery should be of solid waste environmental protection department supervision and management, only the garbage was handled by the sanitation department. “Mobile phone battery recycling, treatment and the corresponding Environmental Protection Agency should be responsible for publicity.” Bowron army says.

Asked if some people do not understand the relevant circumstances, to mobile phone dell latitude d505 battery , dell latitude d520 battery, together with the garbage thrown into the trash, sanitation sector will be how to deal with. Bowron military reluctantly said that the current sanitation workers are not trained to handle hazardous waste training, it is impossible in several tons of garbage to pick up cell phone batteries, “had to compress together with the garbage.”

EPA e-waste treatment center can only be processed after the establishment of dell latitude d600 battery

Then interviewed the city’s Environmental Protection Bureau, the Bureau of Solid Waste Management Center Division is responsible for oversight told this writer that “mobile phone battery recycling, processing by the Environmental Protection Agency is responsible for” this argument is accurate, EPA Solid Waste Management Center is the oversight of certain enterprises to carry out solid waste collection, disposal, transportation, processing, but not personally send someone to engage in related work. Mobile phone battery recycling and disposal considerable technical difficulties, the cost is quite high, “At present, it is basically a ‘vacuum’, Guangzhou, there is no enterprise specializing in mobile phone dell latitude d610 battery , dell latitude d620 battery recycling, even if the extracts useful material, relative to their cost in terms of is still not cost-effective. ”

The official also disclosed that at present the construction of Baiyun District in Guangzhou are hazardous waste landfill, while also exploring the establishment of e-waste processing center; in these two tasks have been completed, it will be discarded e-waste processing center phone battery collection, processing and re-use, while the battery did not take advantage of some of the value of hazardous waste landfill will be sent to landfill. It is learned that the cost of landfill for waste disposal landfill site than the average several times higher, can use technical means to ensure the dell latitude d630 battery , dell latitude d810 battery does not pollute the land after the landfill is expected to put into use next year.

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