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In this paper, the relationship between the magnetic field distribution of the energized coil and the magnetic induction intensity with distance is studied, and the factors affecting the wireless energy transfer of the two coils are analyzed. The basic functions and characteristics of DPA425 switching power supply chip are introduced. The low-power wireless power supply circuit is designed by DPA425 switching power supply chip. The basic structure of the circuit and the specific process of voltage feedback control using optocoupler are analyzed. The receiving circuit of the electric energy has a simple structure, and only one coil is needed as the inductive receiving coil, and the power can be supplied to other electronic devices through a simple rectifying and filtering circuit. The whole circuit is simple in structure and stable in operation. It can effectively transfer electric energy in the range of 5 cm after test, and the wireless transmission power is large within 2 cm. It has the ability to wirelessly charge mobile phones, cameras and other electronic products, and has achieved practical application. Level.
DPA425 low power wireless power supply schematic
The above is part of this article, circuit diagram analysis and more content can be found in the PDF document!
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