Analysis of common failures and solutions for power adapter manufacturers
Power adapter in the computer system plays the role of the source of power, it's normal work or not, is the entire computer system is the key to the normal operation of the premise. But in the daily maintenance of the computer room, it is found that the power adapter and other computer components, there will be a variety of faults. This article will introduce the general method to judge the power failure, and combined with several specific fault examples, to introduce the specific analysis and processing methods.
Now computers generally use ATX power adapter, when the system fails, it should be from the BIOS, the power adapter itself and the motherboard and other aspects of a comprehensive analysis. According to the principle of computer maintenance "after the first soft hard", we should first check the BIOS settings are correct, ruled out due to improper setting of false failure; the second step, check the ATX power supply is normal; the third step, check the motherboard power monitor and control circuit is normal.
To determine whether the normal power adapter, power is removed, (such as a hard disk, etc.) equipment with a scrap of false load, so as to avoid the no-load protection. Between the PS-ON signal line (green) and the ground wire access to a 100 ~ 150 of the resistance, so that the signal into a low level. If the power can work, indicating the fault in the motherboard or BIOS settings, otherwise the fault in the power supply itself.
Charger common problems
A fast charger and quick charger is what is the difference?
The comparison between the two is in fact no sense. In the battery industry, the two types of chargers are not clearly defined. Therefore, manufacturers often confuse them. One problem is that the time of a battery is dependent on the capacity of the charged battery. A need to spend one hour full (180 MAH) section 1 standard capacity AAA Ni Cd battery charger may need 8 hours can be filled with a high capacity Ni MH battery (1500 MAH). The best way is to ignore these differences, a rough calculation of the time the charger is full of batteries.
Two. How long does it take to fill up the battery?
We can easily calculate the time it takes for the charger. With the capacity of the battery, simply divided by the charging efficiency of the charger, and then increased by 20% as invalid working hours. For example, using a charging rate 500mA charger takes about 4 hours can be filled with a 1600mAh battery, the calculation formulas for 1600 mAh/500 Ma x120%. This example may occasionally be applied to the rapid charger for standard 5 nickel metal hydride battery charging situation. Remember, if a battery is only part of the discharge, obviously, we only need to spend less time to be able to fill it up.
If you think this is too complicated, you can use our special battery charge time calculator: http://www.greenbatteries.com/documents/Charge_time_calculator.htm. You only need to enter the two values on the top of the row on the line. And then by Calculate (calculation), the results will be immediately in the hours (hours) before the window appears.
Three, the use of the charger will damage the battery it (will reduce battery life or reduce the use of the battery effect)?
Yes. The most common failure of charging is the charging time is too long, commonly known as excessive charging. There is a kind of charger is particularly easy to lead to excessive charging, usually charge more than 5 hours (some 8 hours) battery will be scrapped, this charger is the so-called fast charger". The problem with this charger is that there is no charge control device. Most of the fast chargers are usually designed to be very simple, they generally charge at a maximum rate, charging time is relatively fixed, usually 5 or 8 hours is full of. Then, you should put them off, or to slow trickle charging rate. If you use the charger correctly, it usually does not have much damage to the battery. Without proper use, the battery will be reduced in two ways.
How to Choose An AC/DC Adapter?
With an increasing number of new electronic gadgets - phones, music players, PDAs, handheld games and other toys - comes an increasing number of AC Adapters needed to charge and power those gadgets. Often the adapteris lost or broken, and choosing a replacement can be confusing because of the variety of selections available
1.Determine the desired output specifications of the AC adapter. This can usually be found on the old adapter, the electronic device, or the instruction manual of the electronic device. There are two components to this: the voltage, measured in volts, and the current, usually measured in milliamps (ma). When selecting an adapter, you will want to match these as closely as possible.
If an exact match is not available, it is better to err on the side of the new adapter having a lower voltage and higher current than the specifications require. For example, if the device calls for 6 volts at 500 ma, it is preferable for the new adapter to provide 5 volts at 600 ma (lower voltage, higher current) than it would be for the new adapter to provide 9 volts at 333 ma (higher voltage, lower current), as the excess voltage could damage the electronic device.
2.Determine whether the adapter should be regulated or unregulated. Simply put, an unregulated adapter does not always produce the rated voltage while a regulated adapter does. Because of this, regulated AC adapters are also generally more expensive than unregulated ones.
It is possible to substitute a regulated adapter for an unregulated one (the downside being added cost), but it is not advisable to substitute an unregulated adapter in place of a regulated adapter as this could cause the electronic device being powered to fail.
3.Determine the polarity of the adapter, which will either be positive or negative. The following image shows how polarity is usually represented.
Polarity determines the direction that current flows; if the current from the adapter flows the wrong way for the intended electronic device, the device may be damaged. It is important to be sure that the polarity of the adapter and the device match.
4. Determine the size of the adapter plug. Plug sizes are normally measured in millimeters.If the plug size is the only thing wrong with an adapter, meaning that its voltage and current ratings, whether it is regulated or unregulated, and its polarity all match, it is possible to splice a new plug onto the adapter, as many electronics stores do sell just the plug in different sizes. However, care must be taken to ensure that the new plug maintains the same polarity as the old one, meaning that the wire that connected to the outside surface of the old plug still connects to the outside of the new plug, and that the wire that connected to the inside surface of the old plug still connects to the inside surface of the new plug
5. Choose an adapter that meets all of the above four requirements: proper output voltage and current, regulated voltage if required, proper plug size, and proper polarity
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