The adapter of electric steel is generally only used in a music teaching system, that is, there are many teaching systems composed of electric steel, which mainly collect information, and transfer the data to the electric steel and computer in front of the teacher! To achieve some teaching functions!
Power adapter is a power supply conversion equipment for small portable electronic equipment and electronic appliances. It is generally composed of shell, transformer, inductance, capacitor, control IC, PCB board and other components. Its working principle is to convert AC input into DC output; According to the connection mode, it can be divided into wall type and desktop type. It is widely used in security camera, set-top box, router, light bar, massage instrument and other equipment.
1、 What does the nominal voltage and current of the power adapter (hereinafter referred to as the power supply) mean? First of all, the nominal voltage of the general power supply refers to the open circuit output voltage, that is, the voltage when there is no load and no current output, so it can also be understood that this voltage is the upper limit of the power supply output voltage.
When active voltage stabilizing elements are used inside the power supply, even if the mains voltage fluctuates, its output is also a constant value. For the power supply equipped with small transformers on the market, such as Walkman, if the mains power fluctuates, the output of the power supply will not fluctuate.
Generally speaking, the real no-load voltage of an ordinary power adapter is not necessarily completely consistent with the nominal voltage, because the characteristics of electronic components cannot be completely consistent, so there is a certain error. The smaller the error, the higher the consistency requirements for electronic components, the higher the production cost, so the price is more expensive.
In addition, with regard to the nominal current value, no matter what power supply has a certain internal resistance, when the power supply outputs current, a voltage drop will be generated internally, resulting in two things: one is to generate heat, so the power supply will be hot, and the other is to reduce the output voltage, which is equivalent to internal consumption.
