How to understand different types of power circuits

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A circuit diagram usually has dozens or even hundreds of components. Their connections cross and cross and the form changes. Beginners often don't know where to start, how to read it. In fact, the electronic circuit itself has a strong regularity, no matter how complicated the circuit is, it can be found through analysis that it is composed of a few unit circuits. It seems that the children's building blocks, although there are only ten or twenty or thirty kinds of blocks, but in the hands of children can be built into dozens or even hundreds of flat graphics or three-dimensional models. By the same token, a complicated circuit can be found through analysis, and it is also composed of a few unit circuits. Therefore, beginners only need to familiarize themselves with the basic unit circuits that are commonly used, and then learn to analyze and decompose the power of the circuit. It is not difficult to understand the general circuit diagram. According to the function of the unit circuit, they can be divided into several categories, each type has many kinds, and there are probably hundreds of all unit circuits. Below we select the most commonly used basic unit circuit to introduce. Let's start with the power circuit.

Power circuit function and composition

Each electronic device has a power supply circuit that supplies energy. The power circuit has three kinds of rectifier power supply, inverter power supply and frequency converter. Most of the common household appliances use DC power. The easiest way to power a DC power supply is to use a battery. However, the battery has the disadvantages of high cost, large volume, and need to be replaced from time to time (the battery needs to be charged frequently), so the most economical and convenient and convenient is to use a rectified power supply.

The power supply in the electronic circuit is generally low-voltage direct current, so if you want to convert from 220 volts to DC, you should first convert 220 volts AC into low-voltage AC, then use the rectifier circuit to turn pulsating DC, and finally filter the pulsation with the filter circuit. DC power is obtained only after the AC component in the DC power. Some electronic devices have high quality requirements for power supplies, so sometimes a voltage regulator circuit is required. Therefore, the composition of the rectified power supply generally has four parts, as shown in Figure 1. The transformer circuit is actually a core transformer, and only the latter three unit circuits need to be introduced.

The above is a partial description of the information, see the PDF document for more details!