Integrated DC stabilized power supply circuit diagram

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Overview:
This paper introduces the working principle of the integrated DC stabilized power supply circuit and designs the circuit diagram. The realization process of transformer, rectifier, filter and voltage regulator circuit is analyzed. The design of the power supply is realized by selecting the appropriate parameter size through the selection principle of the components.

0 Introduction The operation of any electronic device is inseparable from the DC power supply. The normal operation of transistors and integrated circuits requires DC power supply. The methods for providing DC power mainly include dry batteries and regulated power supplies. The dry battery has the advantages of stable output voltage and easy portability, but its short capacity and short life are also obvious. The DC stabilized power supply can convert 220V AC into a steady stream of stable DC. It consists of four parts: transformer, rectifier, filter, and voltage regulator. The reference circuit is shown in Figure 1.

1. The output voltage of the variable voltage regulated power supply is generally determined according to the needs of the equipment. Some instruments require several different voltages at the same time. The separate regulated power supply can adjust the output voltage within a certain range. When the adjustment range is large, it can be divided into several gear positions. Therefore, it is necessary to convert the alternating current into a voltage of a proper amplitude through a power transformer, and then perform rectification and the like. If necessary, the secondary coil of the transformer generally uses two or more suitable transformers to convert 220V±10% of high-voltage alternating current. To meet the needs of low-voltage AC, to meet the power supply and output voltage requirements, the following principles should be followed:
(1) Reliable and stable output should be ensured at 220V ± 15%. Generally, the DC voltage after transformer transformation, rectification and filtering can be determined as follows:
First, it is necessary to consider the integrated voltage regulator circuit is generally required to minimize the input and output voltage difference; the second is to consider the bridge rectifier circuit to consume two diodes forward voltage drop; the third is to leave a certain margin. Excessive output voltage will increase the amount of heat dissipation, and too low will be unstable when output low voltage, thus determining the DC voltage.
(2) The transformer must retain more than 20% of the current margin.

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