About switching power supply adapter

　　Before explaining the "switching regulated power supply adapter" (referred to as the switching power supply adapter), let's first explain the "power adapter".

　　Generally speaking, the power adapter can be divided into two categories: direct power adapter and indirect power adapter. Of course, the output of the power adapter is electrical energy. However, there is no power adapter that can be used directly in nature. Although natural phenomena such as thunder and lightning produce a certain amount of electrical energy, it is difficult to use as a power adapter. Therefore, the power adapters used by human beings are converted from mechanical energy, thermal energy, chemical energy, etc. Power adapter manufacturer: Jiuqi calls the power adapter obtained from other energy sources through the conversion surface as a direct power adapter. For example, generators, batteries, etc. are direct power adapters. In many cases, the direct power adapter does not meet the requirements for use and needs to be changed again.

　　This transformation is to transform one form of electrical energy into another form of electrical energy. The transformation of the form of electric energy can be a transformation between alternating current and direct current, a transformation of voltage or current amplitude, or a transformation of alternating current frequency, phase number, etc. In some occasions, this transformation of the form of electric energy may only be an improvement in stability and accuracy or an improvement in other performances. Since the input of this kind of power adapter is also electric energy, the power adapter manufacturer: Jiuqi calls this kind of power adapter whose input and output are all electric energy as an indirect power adapter.

　　The direct power adapter that people touch the most is the power adapter provided by the public grid. Whether it is enterprises, institutions, or households, almost all the electricity used is directly or indirectly provided by the power grid. Grid power adapters come from power plants. At present, the power generation methods of power plants mainly include thermal power generation, hydropower generation, and nuclear power generation. Thermal power generation converts thermal energy into electrical energy, hydropower converts mechanical energy (potential energy of water) into electrical energy, and nuclear power generation converts nuclear energy into thermal energy and then into electrical energy. In addition to the three main power generation methods of water, fire, and nuclear power generation, there are also renewable energy power generation methods such as wind power generation and solar power generation. The power adapters provided by the public grid are all industrial frequency AC power adapters.

　　Another direct power adapter that people come into contact with daily is the electrochemical power adapter. Dry batteries and accumulators are typical representatives. Although the electric energy provided by this kind of power adapter occupies a very small proportion, it is more and more closely related to people. Although the chemical energy stored in the storage battery and some rechargeable dry batteries is obtained from the charging of the power adapter, the electrical energy during use (discharge) is directly converted from the chemical energy, so these power adapters are still direct Power Adapter.

　　In addition to the power adapters provided by the public grid and batteries, the power adapters obtained from diesel generators, wind generators, and solar batteries are also classified as direct power adapters here.

　　Power adapter manufacturer: The input and output of the switching power adapter described by Jiuqi are all electric energy, so it belongs to the indirect power adapter. It is the main research object of the power adapter manufacturer: Jiuqi, and the direct power adapter does not belong to the power adapter manufacturer: Jiuqi The scope of the research.

　　Switching power adapter circuit is a kind of power electronic circuit. Electricity is usually divided into two categories: alternating current (AC) and direct current (DC).https://powerstation-gf.com/prodcuts/SPS-001-wall-mounted-home-energy-storage_283.html

　　Therefore, the basic power electronic circuits can be divided into four types, namely ACDC circuit DC·AC circuit, AC-AC circuit, DC-DC circuit, see Table 1-1. ACDC and DC·AC are generally easier to understand. For ACAC circuits, the objects that can be transformed are frequency, phase number, voltage, and current. For DCDC circuits, the main objects that can be transformed are voltage and current. The core components in power electronic circuits are power electronic devices, which generally work in a switching state, so that the loss can be small. This is a significant feature of power electronic circuits.

　　As the name suggests, a switching power supply adapter is a power supply adapter in which the power electronic devices in the circuit work in the on-off state. In this way, if the four basic power electronic circuits in Table 1 are regarded as power adapter circuits, all power electronic circuits can also be regarded as switching power supply adapter circuits. In practice, the range covered by the switching power supply adapter is much smaller than the range in the table. For example, the phase control circuit in the rectifier circuit does not belong to the scope of the switching power supply adapter.

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