Power circuit for supplying 5V voltage

Abstract

The invention discloses a power circuit for supplying 5V voltage. The power circuit comprises a transformer T, a rectification filtering circuit, an RCD (residual current device) circuit, a feedback transmission circuit, a feedback receiving circuit, a first voltage output circuit, a second voltage output circuit and a third voltage output circuit, wherein the input end of the rectification filtering circuit is connected to a 220V alternating current power supply through a choking coil, and the output end of the rectification filtering circuit is connected with the input end of the RCD circuit; the feedback receiving circuit, the first voltage output circuit, the second voltage output circuit and the third voltage output circuit are respectively connected with the output end of the RCD circuit through the transformer; the input end of the feedback transmission circuit is connected with the first voltage output circuit, and the output end of the feedback transmission circuit is connected with the feedback receiving circuit; the feedback receiving circuit is connected with the output end of the rectification filtering circuit through a power controller. The power circuit has the advantages of small size, high efficiency, accurate voltage stabilization and low interference, and a plurality of paths of voltage can be simultaneously provided.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a power supply circuit supplying 5V voltage. Background technique [0002] With the development of integrated circuits, various processing chips are used more and more widely. These chips and the circuits controlled by the chips often require a small DC voltage as the working voltage. Among them, 5V DC voltage is commonly used for CPU, communication circuits, etc. Voltage. [0003] Although there are already some modules and devices on the market that can convert 220V AC to 5V DC, most of the current conversion circuits are "one-to-one", that is to say, the entire circuit has only one 220V AC input terminal and A 5V DC output terminal, therefore, can only supply one voltage. For some chips, although they all have a working voltage of 5V, their working currents are different. In this way, multiple power supply circuits are required, which will cause The problem of high cost and large vo...

AI Technical Summary

Problems solved by technology

[0003] Although there are already some modules and devices on the market that can convert 220V AC to 5V DC, most of the current conversion circuits are "one-to-one", that is to say, the entire circuit has only one 220V AC input terminal and A 5V DC output terminal, therefore, can only supply one voltage. For some chips, although they all have a working voltage of 5V, their working currents are different. In this way, multiple power supply circuits are required, which will cause Problems of high cost and large volume

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