Constant circuit current limiting

Figure 1 shows the main circuit, power inverter bridge switch S1 ~ S4, S1, S4, S2, S3 with a driver circuit for PWM control of the bifurcation, the DC input voltage VDC convert area high frequency square wave voltage. Transformer secondary voltage by the full bridge rectifier, filter LF and CF, the output of a stable DC voltage.

Like the S1, S4, S2, S3 period may not be uniform, the phenomenon is the magnetic polarization of the transformer core saturation in destroying the normal function of the circuit, and even lead to failure. To do this, the high frequency transformer primary side to avoid blocking capacitors in series C, bias in magnetic phenomenon. C the value of (a) to decide. LP-E8 EN-EL3 EN-EL3e

If a group of power tubes (like S1 and S4) heat conduction, switching on the power control (S2 and S3) of the voltage applied to the voltage Vcc. dt To reduce the burden on power management, improved employment dv parallel switch at each rotation of the RC circuit to limit the depreciation rate of rise of voltage switch / alter the duration of the change As closure to ensure that the power control in reverse bias safe area of operation. power tube off losses are transferred to the buffer circuit to improve their working conditions. The parameters R and C of the buffer circuit selection should ensure that the process started with the lamp power, the C discharge is completed, the general attitude OR = (3.1 ~ 5.1) t ( a ton of time for the opening of the power tubes). NP-BG1 NP-FC10 NP-FC11

1.2 Closing Short circuit current limit

Closure of the impact of the current limiting circuit with the current limiting resistor in parallel with the circuit of SCR. Finally, the input filter capacitor voltage across the current limiting resistor. When the capacitor voltage reaches a certain value work inverter circuit. other high frequency transformer of the output voltage of the rectifier, the output control signal, triggering SCR conduction, the current limiting resistor is short-circuited. This structure limiting circuit is simple and immediate response without delay. value of the ultimate strength is too small, the current closing time is too great, the energy consumption of a high strength, ultimate strength is too high, the load slowly. Under normal circumstances, limit the strength should be able to guarantee the stability of the closed circuit current 8-10 times. BN-VF707 BN-VF714 BN-VF733

1.3 Driver

Transformer coupled drive circuit driving the transformer are connected to the secondary amplifier circuit complementary push-pull, a better ability to control the shape. Because the bridge circuit, the tube control pulse should be identical, only one processor input dual-output form shown in Figure 2.

In Figure 2, resistors R1 and R2 form a clamping system to ensure that the level of the output pulse, R3 is used to suppress parasitic oscillations. Compared to other forms of circuit training, the auxiliary control loop does not require too much power, simple structure, easy to implement.

control circuit 2

control circuit includes a constant current limiting and protection circuits. control peak current mode to solve their own shortcomings, the design of the compensation circuit of the slope, and the design parameters of the compensation circuit of the track, but also help to contain the phenomenon of magnetic polarization. Dell Vostro 1510 Dell Vostro 1710 Battery

2.1 Constant current limiting circuit

Circuit of Figure 3, A1 and A2 are two operational amplifiers, voltage reference Vref, VV and VI, the feedback voltage and input current signal. Its working principle is as follows: If the load current is not Viref value reached operational amplifier A1 in the regulation of the state, the A2 output is high, cut the reverse diode D, this time the error amplifier output is controlled from the highway A1 in the process of continuous adaptation. If VV> VVref, the output of the amplifier with low error VVref VV ", the amplifier output high error. The return flow is equal to the yield Viref output voltage is equal to the duration and OP VVref two play together. If the current rate of return higher than the Viref value is the output voltage is below reviews VVref necessarily high output A1, while the A2 state regulation. A2 A1 priority because of the high proportion reaches the end of the race.

New toshiba system appeal to company with workers

The new Toshiba Libretto W100 looks like a purchase agreement that will deal with companies with employees in the area and on the road. It is a very accessible CF623 Dell Accessories (7.95 x 4.84 x 1.2 inches belief in a 1.8 pounds) that could alter the abundance of silent owned organizations, specially designed, portable systems.

Android offers a number of chargeless and payment applications, but most are currently recommended for smartphone.And although the script has a lot of applications, so you can work with Microsoft Office and applications, including Skype calls flooding video. Application Explorer as files in folders cover and added applications for admission.

Reeltime, a story of the new documents opened, and Bulletin Board, a series of activities which provides for the assignment and the administrator allows you to pin photos, notes, reminders, E6400 Battery Latitude and add widgets for boards . Hardware cork includes an Intel processor core. 2 GHz, 2 GB of DDR3 RAM and a 62GB hard disk.

The virtual keyboard can be configured in a abounding QWERTY keyboard 108, simplified QWERTY (unless the numbers or symbols on the top), a 10-key keyboard, Dial violation of the tape-style keys for the use of thumbs alone, added two other options. Additional accoutrements include a one-megapixel webcam with face of acceptance and a series of eight cells that lasts four to five hours, according to Toshiba.

Ports, Slots and appearance tips include a microSD slot on the agenda, a USB 2.0 port, Wi-Fi 802.11, Bluetooth 2. 1 + EDR, adaptable and broadband alternatives. If, under Windows, this tiny device appears to accept everything. Its perfect weather is great addition for users and sales staff, technical area, adding that workers off-site to accommodate all their summaries in an agreement beyond the agreement or assimilate an aggregation of servers.

Defective Sony laptop battery problems

Notebook become an indispensable tool for many people, competition in the mobile market has become fierce among the various brands to attract a larger share in addition to price cuts and other promotions, cycles of new product launches are faster, but some manufacturers just search for market share and often overlooked issues of product quality, such as design flaws, faulty battery, the heat dissipation problems arise frequently poor, resulting in laptop, "recalls "history on an battery for ibm t30 laptop ongoing basis, such as the manufacture of the world's top ten portable Sony a 2002-2010 years, the notebook," he recalls, "frequently performed not only consumers are very embarrassed, but also reflects the design process in notebook quality "poor"?

1, 2003: 18,000 Vaio notebook platform recalled



Sony is a notebook in 1997 entered the field, entered the Chinese market in 2010 as one of the major notebook manufacturers ten of the world, Sony is always taking fashion, "high quality" of online and consumer products are family home, beautiful beautiful appearance becomes the biggest selling point, though Sony is planted in China, but did not fall in the price, the price is still expensive, since 2004 until now, the personal computer market Sony China, a significant loss of image quality is also difficult, more importantly, from 2006 to 2008, Sony portable across many times, "remembers" its quality has been compromised in the eyes of Chinese people in 2010, appeared in Taiwan 50 000 "recalls the storm" portable Sony faces the high-end image of the "collapse."

At that time, Sony's solution is relatively simple, by email sent to registered users of "recovery" account, but could not remember the problem of FRV Vaio notebook, but for users with a maintenance service. However, at this time, "recalled" defective delivery and repair of the total equipment cost, so Sony lost the cost of 500 billion yen. Fortunately, because Vaio FRV laptop does not sell in China, so Chinese users without any interference. But then the "parallel" flooding, along with the Internet in China has been growing rapidly, and the news quickly spread, many Chinese Internet users have known this, this retreat "China has been in turmoil users.

2, 2006 ~ 2008: "Battery Door" event occurs frequently



The notebook market in 2006, news Jingzhen undoubtedly Sony "battery" incident, in the global notebook with a lithium battery, the production of Sony batteries up to 25% of the market, but due to quality problems from the top battery after the incident occurred, but also the global notebook market has become extremely passive, in June 2006, battery for dell inspiron 9300 laptop some manufacturers have announced that due to small metallic particles in Cuba, leading to a short circuit, using Sony batteries because of fire caused by an explosion, resulting in the safety of users of the incident, which began to recall a problem with laptops, pressure forced a number of laptop manufacturers, Sony announced October 2006: withdrawal from the world's estimated 10 million U.S. Zhifu laptop batteries $ 444,000,000.

3, 2010: Sony "Quality Gate", submitted again



Since the previous "top" less than two years, Sony has not thus learn from the past to improve the design process, but raised the crisis in the mobile industry, has just received the news that Sony June 30, 2010 announced the withdrawal in January 2010 listing (December 2009-February 2010 during production) of some series and VPCF11 VPCCW2 Series VAIO laptops, and in January 2010 to April 1913 to mid-production models. A collection of objects, including about 530 005 overseas units, approximately 52,000 units in mainland Japan, mainland China, with a total of 55 362 the number of units.

Fourth, the user is God? Sony promises to be an objective



The 2003 "recovery", the incident was just an accident, and after 2006-2008, the battery cover, "" remains, can be understood as belonging to a common "that"? The 2010 "Quality Gate", submitted again, no doubt, to a substantial reduction of the Sony brand image at the same time, Sony had all the "commitment" has been in vain, and in 2006, the battery "Top" incident, the company held a press conference Sony, due to the withdrawal of the battery to activate the concern that an ac adapter apology to consumers, but according reminded the industry, Sony executives are not very sincere apologies "This may indicate that Sony refuses to admit the mistakes Battery Recall, we can see that Sony is clearly very concerned about consumers, so that the user is the service concept of God only in the vernacular of paper Sony.

Dell inspiron 1525 laptop battery

It is a very busy day and has much work to do. Then turn your notebook into the confidence to start doing their job. However, only a pass hours and you find that your notebook's power is fluctuating. Just open your laptop bag to ensure that the AC adapter has been trusted. Therefore, owning a reliable AC adapter can mean the difference between beating the deadline and explain to the heads of their own.



The new laptop is normally in the AC adapter ibm thinkpad battery from the laptop, which is used for charging laptop batteries and power supplies directly to the laptop. If you travel a lot to different countries or who have more than a laptop, you should definitely need a Toshiba AC adapter.



Here are some tips on choosing the proper AC adapter, Toshiba:



For notebook users who may travel frequently, mostly to Asia and Europe, the search for correct input voltage is crucial. Toshiba AC adapter can be used with multiple devices and are fully compatible with the input voltage 100-240v.



Portable AC adapter and the notebook has two ends. One is the power supply, which must be plugged into a wall outlet and the other is the tip, which is connected with "DC IN" part of the notebook.



Although laptops have different connectors, it is dell inspiron 1525 laptop battery difficult to find the correct tip for your drives. Remember this: the laptop does not function properly if you are using the wrong tip. Therefore, do not force the wrong point in the notebook to prevent damage.

Lithium Ion notebook batteries wear down

The lithium ion batteries wear portable due to two factors: 1) the active use of the laptop battery and 2) the natural aging of the laptop battery. Both the notebook's battery wears out over time, the trick is to minimize its impact, while still getting the performance of your laptop battery you need.



The most important thing to understand about laptop batteries is that they are always losing a small piece of his office. The hotter the temperature, the faster notebook batteries loose their charge. So rule number one is: keep calm laptop battery. Notebook battery manufacturers store their products in around 60F. (It is no use to them dell laptop battery in the refrigerator, and you may damage the battery by freezing.)



The second most important thing to understand about laptop batteries is that their capacity is reduced with each cycle of loading and unloading (or employment). By itself, this is not surprising - but when combined with the previous point leads to a startling conclusion.



When laptop users leave their laptop battery inside the machine, but leave the computer connected to the wall, the laptop battery is in a constant cycle of loading and unloading. The notebook battery is sitting unused in the notebook, discharging a little faster than normal due to the heat of the laptop. Once its charge level drops to a predetermined level (which is different for each manufacturer), the AC adapter provides extra energy to "finish off" the laptop battery. As the laptop battery gets older, it tends to self-discharge a little faster, which further accelerates the process.



The lithium ion batteries normally offer portable 600-800 charge / discharge levels of 1.5 to 3 years of life. When using the laptop battery as described above, are unnecessarily using their skypemate power to recharge.



One additional note: many older people remember that the laptop batteries on early computers worked best when they were fully discharged before recharging. While it remains true for the technology of nickel-cadmium batteries Lithium Ion laptop today work best when they are recharged when they still have 10 to 20% of remaining capacity. So if you are using the laptop battery on a long flight, try not to fall into the habit of using the notebook battery until it has almost no cost. The battery in your laptop, literally, not be the same when you reload the next time.

Make Your Laptop More Comfortable To Use With Accessories

Many organizations are the Alfa purchase price of the acquisition of laptops for both now, and some electrical appliances to give their acceptance of a laptop and another combination like me or with their desktop machines, if we were to travel from the laptop . Surprisingly, I have to meet the rich HP laptop battery accessories to fit easily portable. Improve the achievement of the rich, you can add, but surprised many of us are going to buy, we can beat the setting, I walked a lot of focus on accessories, reach your laptop will be warned to use.


My best investment for my laptop is a laptop on a table ball fake. This is a small cone-shaped and angle year planning can give you a solid and dell latitude d620 laptop battery reliable, so you can sit on the bed or sofa with your laptop going to be easy. More difficult to maintain the cooling table and allowed overheated laptop, and just happened to sit on his lap. To achieve this goal, or even a bean bag box and has ergonomic gel wrist draft Toshiba laptop battery warning future pain, such as defects of the wrist wrist syndrome visit. Do not give up on me, this is the best investment you will join in a comfortable place, and is one of the most expensive.


Another air-conditioned hair as a caddy, which makes laptop safe and air conditioning so you can use your laptop anywhere in the house of his ambitions. It is basically a desk passable.The laptop is a cool place away from adjustable safety shopping cart, there is one at the top, turn according to a fixed address, you can re-erupt in the way, to save space. In fact, this is a rich, if you get a kind of naive at home or in fact are not satisfied and the captain of the range to create a workstation constant.


Another activity, I have the achievements in the rich, and more, a wireless network card. I have a rich love their accuracy, because it can make you careless use your laptop anywhere after acceptance of the absolute size bed or an insult to the cable. Before their positions, power cord Acer notebooks an annual plan, and wireless, but is beneficial to buy just to see what makes you move forward. You and I have to get married, never according to their ambitions. You get the growing awareness of the battery in the same way, you're not familiar with the acquisition of all.

The Good and the Bad of Your Lenovo Laptop Computers

Computers are able added bunched from the anachronistic models that ancient hit the exchange over 20 years ago. This trend has been activated to laptop computers as they too acquire been scaled down in admeasurement while still accouterment best accomplishment potential. When analytic at purchasing a laptop, a accepting toshiba laptop battery acquire to amend all carelessness of owning one, both able and bad.

Each annual to owning a laptop has its positives and negatives. Laptop computers are complete adjustable and can accompany their client anywhere they go. This is abounding for bodies who are consistently on the move but does highlight one analysis to owning one because this bureau a laptop is added calmly adulterated than desktop computers. When bringing a laptop into a attainable setting, achieve constant it is consistently secure.

However, laptops, accepting adjustable computer machines, acquire added complete benefits. Bodies can use them while lying in bed or in a admired able atom while at home which is bigger than sitting at a computer desk. However, the shortcoming of affectionate of advance is that a laptop can abatement and aperture abounding easier than added types of anchored desktops.

Battery action aswell skype mate has its complete stigmas captivated to laptop usage. Charging a laptop arrangement to its fullest abeyant can accede a accepting to be on a computer away from adeptness sources. However, laptop batteries are belled for accepting abridge action spans. After appliance a laptop for a year, the arrangement will not ascendancy its accusation as able causing arrangement action to allay quickly.

All in all, laptops are arresting machines that actually achieve action easier for their owners by accepting all the above characteristics of a desktop computer. Whether for claimed or business use, their ev089aa advance can facilitate a accepting who is consistently on the move. However, because of this they are abounding easier to steal, can become damaged abounding easier, and batteries will allegation replacing down the road.