First of all, what is the average value of the charger manufacturer's rated voltage and current? First of all, the nominal voltage of a general power supply refers to the open-circuit output voltage, it is not connected to any external load, and there is no current output voltage, so it can be understood that the voltage is the upper limit of the output voltage of the power supply.
In the case of a power conditioner for internal use of active components, even if the power supply voltage fluctuates, the output is a constant value, such as the general small transformers on the market, such as walkmans, etc. and the power supply. If the power supply fluctuates, the output of the power supply will not follow fluctuation.
Usually the true no-load voltage is not necessarily the same as the nominal voltage of the power adapter, because the characteristics of the electronic components may not be exactly the same, so there is a certain error, the smaller the error, the cost of the production of electronic components is required for consistency High, so the price will be more expensive.
In addition, relative to the rated current value, regardless of any power supply has a certain resistance, therefore, when the output current of the power supply, the internal pressure will drop, which will cause two things, one is to generate heat, so the power will be Heat, the other is the equivalent of internal consumption when the output voltage drops.
Secondly, it is the same nominal voltage of the power supply, the output current is different, can't it be used in the same book?
The power supply voltage and output current are different and cannot be used in the same book. The basic principle is that the rated current with high power can be replaced with the small rated current with power. Some people think that the large nominal current of the power supply will burn the books because the current is too large. In fact, how much current there is depends on the same voltage as the load, hehe, just think about junior high school physics.
Switching power supply
When operating at a high load, the higher the current, when the book enters the standby state, the book with a smaller current, the large rated current power supply has sufficient current margin. On the contrary, some people use 56 watts and 72 watts of power, instead of using it, there is no problem, because the usual power adapter is designed to leave a certain margin, and the load power must be less than the supply power, so this place is feasible for general use. But the remaining power supply has little power margin. Once you pick up a lot of book peripherals, such as two USB hard disks, then the CPU runs at full speed, and there is a base to drive the disk at full speed at the top, plus charging the battery at the same time, it is estimated It is dangerous, you should always feel whether your power supply can already boil eggs. So don't use low current power instead of high current power.