It is very important to have a correct understanding of various switching power supplies.
The word "power supply" is a bit general. If you live in a hotel on a business trip and cannot find a 220V AC outlet, you may say that the hotel does not provide "power supply". In this context, "power supply" refers to The "AC input power" of the input terminal of a power supply device. When you are on a business trip and you find that your laptop does not have a "power adapter", you will get used to saying that you have a computer but no "power supply".
If someone asks you what your occupation is, and you say that you work in "power supply" or answer that you work in "switching power supply", the other person may think that your occupation is very ordinary and not high-tech. But the power supply is high-tech in your mind, because what you are doing is a high-end power supply, which no one in China can make, and the person who asks you, the "power supply" in his mind is just a 220V AC power supply on the wall. , or a switch on the wall. You two are not on the same channel.
The power supply seems too common, because it appears to be everywhere. In a general sense, as long as the equipment and facilities that can provide electric energy are power sources. In a narrow sense, the power supply in the hearts of people who do power supply is just switching power supply. I'm going to talk about switching power supplies.
I did a search to find an official definition of a switching power supply. In my understanding, switching power supply is to realize the conversion of electric energy by turning on and off the switching tube. Transformation of electrical energy includes:
1. AC/DC. Converting AC to DC, usually 220V, two-phase AC or 380V, three-phase AC from the grid to DC. The AC input of low-power AC/DC is 220V, and the AC input of high-power is 380V. Depending on the application industry and occasion, it is also called AC/DC converter, rectifier, primary power supply, communication power supply, power adapter, lighting power supply, etc.
2. DC/DC. Converting DC to DC, such as converting high voltage and small current to low voltage and high current, may be called DC/DC converter, secondary power supply, module power supply, on-board power supply, etc. depending on the application industry and occasion.
3. DC/AC. Converting DC to AC, depending on the application industry and occasion, may be called UPS, inverter, grid-connected inverter, motor controller, etc.
4. AC/AC. To convert AC to AC, the usual product form is a frequency converter, which is used for motor control.
The conversion of the above four kinds of electric energy has subdivided into many industries!
In the industry market corresponding to the two directions of AC/DC and DC/DC, people in the industry call it "switching power supply". The specific industry has relatively high-end primary power supply (also called communication power supply, but the meaning of communication power supply seems to be broader ), generally refers to the 48V power supply for the telecommunications room, the secondary power supply, the custom power supply, the power supply, the computer power supply, the power adapter for various electrical equipment such as notebook computers, the mobile phone charger power supply, the charging pile power supply, and the car charger. (OBC, on-board charger), car DC/DC converter, lighting power supply (also can be divided into LED power supply, electronic ballast, HID power supply), etc. For the industry market of DC/AC and AC/AC, people generally say that they are doing UPS, doing photovoltaics (converting direct current to alternating current according to photovoltaic panels), doing energy storage, doing frequency converters, and doing motor control. device.
