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Power Adapter Small Portable Electronic Devices

Shenzhen GEO Technology Co.,Ltd | Updated: Sep 07, 2017

Power adapter is a small portable electronic equipment and electronic appliances power supply conversion equipment, widely supporting the phone son machine, game consoles, language repeaters, Walkman, notebook computers, cellular phones and other equipment. Power adapter is generally composed of shell, power transformer and rectifier circuit, according to its output type can be divided into AC output and DC output type; according to the connection can be divided into wall and desktop.

Uses: switching power supply products are widely used in industrial automation and control, military equipment, scientific research equipment, LED lighting, industrial equipment, communications equipment, electrical equipment, instrumentation, medical equipment, semiconductor refrigeration heating, air purifier, electronic refrigerator, , LED lighting, communications equipment, audio-visual products, security, computer chassis, digital products and equipment, and other fields.


First, the power adapter (hereinafter referred to as the power) of the nominal voltage and current What does this mean? First of all, the general power of the nominal voltage, refers to the open circuit output voltage, that is, do not take any load outside, there is no current output voltage, it can also be understood that this voltage is the upper limit of the power output voltage.

For the use of active power within the active components of the case, even if the mains voltage fluctuates, the output is also a constant value, as the market generally small transformers, such as Walkman with the power supply, if the electricity fluctuations, The output of the power supply will not fluctuate.

Generally speaking, the true no-load voltage of the ordinary power adapter is not necessarily the same as the nominal voltage, because the characteristics of electronic components can not be completely consistent, so there is a certain error, the smaller the error, the higher the consistency of electronic components , The cost of production is high, so the price is more expensive.

In addition, the nominal current value, regardless of any power supply has a certain internal resistance, so when the power output current, the internal pressure drop will occur, resulting in two things, one is to generate heat, so the power will be hot, and the other One is to cause the output voltage to decrease, which is equivalent to the internal consumption.

Second, are the same nominal voltage power supply, the output current is different, can not be used in the same books on the

Power supply voltage, the output current is different, can not be used in the same books. The basic principle is that the large nominal current supply can replace the small nominal current supply. It is estimated that some people would like to think that a large nominal current power will burn books, because the current big thing. In fact, how much the current in the same voltage depends on the load, Oh, think of junior high school physics to know. When the books of high-load operation, the current larger, the books into the standby time, the current is smaller, the nominal current power supply has enough current margin. On the contrary, some people use 56w power supply instead of 72w with no problem, because the power adapter is usually designed to leave a certain margin, the load power should be less than the power supply, so this replacement is generally feasible in the general use, But the remaining power supply power margin is very small, once your books took a lot of peripherals, such as two usb hard drive, and then cpu full speed operation, and then a base, above a CD-ROM to read the disk at full speed, plus at the same time Charge the battery, it is estimated that the danger, and at any time to touch your power is not already boiled eggs. So it is best not to use a small current instead of high current power supply.

Three, exactly the same machine, other people's temperature, I always hot, why?

Do not doubt your power supply problems, first look at your books doing, is not like the above said two USB hard drive, CPU full speed operation, hard disk crazy read and write, drive full speed to read the disk, while charging the battery, loudly Music, the screen brightness of the largest wireless card has been in the detection of signals, etc., make good use of power management, according to the task of reasonable adjustment of the work of the books is very important.

Fourth, the power nominal voltage than my books the battery voltage is much higher, not an accident, right?

First of all, to know is that the power supply to the books and the battery power supply to the notebook is different.

Battery-powered, battery output is pure DC, very clean, the battery voltage is neither possible nor need to design a high, lithium battery chemical properties determine the output voltage of a cell can only be about 3.6V, so A lot of batteries are used in three tandem way, 10.8V also became very popular battery voltage. Some batteries are slightly larger than the integer value of 3.6V, such as 3.7V or 11.2V, etc., in fact, to protect the battery.

Power supply, the situation is more complex, first of all need to add voltage to further regulation filter to ensure that the power performance is not very good in the case of stable operation, the voltage regulator is divided into two parts, all the way to the work of the power supply, The other way to charge the battery to the part of the power supply to the battery when the same power supply, and to charge the battery that part of the need to charge the battery through the battery control circuit can be added to the battery, the control circuit can be very complex, so the power supply voltage Must be greater than the cell voltage to have sufficient capacity to supply the unit to the charge control circuit. Finally the voltage actually added to the cell will never be the nominal voltage of your power supply. Rest assured.