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Circuit layout method of LED street lamp power supply

2018-04-24 16:00:34

Design Input current source loop and input filter Design output load loop and output filter The method that should be used when laying out all the components of a circuit according to the functional unit of the circuit.


First of all, consider the PCB size. When the PCB size is too large, the printed line is long, the impedance is increased, the anti-noise ability is decreased, and the cost is also increased; Too small, the heat dissipation is not good, and the adjacent lines are susceptible to interference. The best shape of the board is rectangular, the aspect ratio is 3:2 or 4:3, and the components located on the edge of the board are generally not less than 2mm from the edge of the board.


This page is based on experience


For circuits operating at high frequencies, the distribution parameters between components should be considered. The general circuit should make the components parallel as far as possible. In this way, it is not only beautiful, but also easy to assemble and weld, and easy to mass produce.


Arrange the position of each functional circuit unit according to the flow of the circuit, so that the layout is convenient for signal flow, and keep the signal in the same direction as possible.


The first principle of layout is to ensure the distribution flux of the wiring, pay attention to the connection of the flying line when moving the device, and put the connected devices together. The loop area is reduced as much as possible to suppress the radiation interference of the switching power supply.