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Power Adapters Introduction
Power adapter (power adapter) is a small, portable electronic devices and electrical and electronic power conversion devices, usually by shell, power transformers and rectifier circuit, its output can be divided into AC output type and DC output type; press connection can be it into the wall and desktop. In the broad support phone screen, game consoles, language video machines, Walkman, notebook computers, mobile phones and other devices.
 
As shown, the power adapter (hereafter referred adapter) above generally have several tabs that require attention. First, the adapter models, such as the Fengyun adapter model XVE-120100, which tells us some news, its manufacturer, the main parameters, XVE company started in the General Assembly is ## yards, 120100 is to explain this adapter 12W, and 10W is 050,200; the second is the adapter input (input), usually in China is generally 100-240V~50-60 Hertz, indicating Fengyun adapter can work at less than 100V-240V voltage; the third is the output adapter ( output), two numbers can quickly calculate the wattage adapter, such as adapters, voltage 12V * Current 1A = 12W (power), indicating that the power is 12W adapter.
Most laptop power adapter for 100~240V AC (50 / 60Hz) in. Most basically regarded as a portable computer and an external power supply and power lines connected to the host, which can reduce the size and weight of the host, only a handful of models built to host power.
Above the nameplate on the power adapter marked power, input and output voltage and current values ​​and other indicators, with particular attention to the input voltage range, which is called "travel power adapter," if the mains voltage is only 110V countries when this function is Very useful, some parallel laptop is sold only origin, there is no such compatible voltage design, 110V or even only a single input voltage, 220V plug in our power supply voltage will burn.
10~12W AC - DC power plug adapter series single-output power supply
 
 
First, the power adapter (hereafter referred to as power) of the rated voltage and current mean? First, the general nominal voltage power supply refers to the open circuit output voltage, which is not connected to any external load, the output voltage when no current, it will be appreciated that the upper limit of the power supply voltage is the output voltage.
The case for internal use and power regulator active element, even if the power supply voltage fluctuations, the output is a constant value, such as the market in general small transformers, such as Walkman and power, if power fluctuations, power output will not follow fluctuations.
Generally true no-load voltage is not necessarily the same general power adapter and the nominal voltage, because the characteristics of electronic components, may not be exactly the same, so there is some error, the error is smaller, the cost of production of electronic components for the conformance requirements high, so the price will be expensive.
In addition, with respect to the rated current value, regardless of any power supply has a certain resistance, so that when the power supply output current, generated in the interior of the pressure drop, which leads to two things, one is to produce heat, so power will heat, is directed to another output voltage decreases, the internal consumption of equivalents.
Secondly, it is the same nominal voltage, output current power supply is different, you can not use the same books?
Power supply voltage, output current is different and can not be used in the same books. The basic principle is that the rated current of power can replace the small nominal current power. Some estimates would think, the power of large nominal current will burn books, because the current big thing. Indeed, how many depends on the load current is the same voltage, Oh, think of junior high school physics will know.
Switching Power Supply
 
When high-load operation, the greater the current, when the book enters the standby state, current is small books, large rated current power supply has sufficient current margin. Conversely, someone with 56 watts 72 watts of power, instead of using them is not a problem, because the usual power adapter is designed to leave a margin, load power must be less than the supply of power, so this place is in general use is feasible, but the remaining power supply power margin rarely, once you pick up a lot of books peripherals, such as two USB hard drives, then the CPU running at full speed, then there is a base to the top of the drive at full speed to read the disk, plus at the same time charging the battery, estimated is dangerous, you should always feel your power is not already boiled eggs. So it is best not to use a small current power instead of high-current power.
Third, exactly the same machine, the gentle power of others, I was always very hot, and why?
Do not doubt your power problem, see if your books are doing, is not run like the above said two USB hard disk, CPU at full speed, hard disk read and write crazy, drive at full speed to read the disk, while the battery, noisy local music, screen brightness maximum charge, the wireless network card has been detected signal and so on, make good use of power management, according to the task reasonable adjustments books working condition is very important.
Fourth, the power supply nominal voltage than my laptop battery voltage, not by chance is much higher, right?
First of all, we need to know is that the power supply to the books of the books and battery power are different.
Battery, battery output is pure DC, not clean enough, the battery voltage is neither possible nor necessary to design very high, the chemical properties of lithium-ion battery determines a power-saving core output voltage is only about 3.6V, so many batteries are based on three series of the way, 10.8V have become a very popular battery voltage. Some battery 3.6V some of them larger than the nominal value of the integer multiples, such as 3.7V or 11.2V etc, in fact, to protect the battery.
Power supply, the situation is more complex, you first need to add a voltage regulator further screened to ensure stability under dynamic performance is not a good situation, a stable voltage is divided into two parts, all work with books, another way That part of the battery when the power to the book, and it is necessary through the battery charge control circuit for charging the battery portion may be added to the same battery power supply charge in the battery, the control circuit can be very complicated, so the supply voltage must be greater than battery It has sufficient capacity to provide a voltage to the charging control circuit of each unit. Finally, the power supply voltage is applied to the real core of you will never be a power rated voltage. rest assured.
Adoption
 
Switching power supply products are widely used in industrial automation and control, military equipment, scientific equipment, LED lighting, industrial equipment, communications equipment, electrical equipment, instrumentation, medical equipment, semiconductor refrigeration, heating, air purifier, electronic refrigerator, LCD monitor, LED lighting, communication equipment, audio-visual products, security, computer chassis, digital products and equipment category and other fields.
 
 
A typical circuit diagram of a power adapter, power adapter needs service personnel can reference circuit.
A typical power supply adapter circuit.
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