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How to wire the switching power transformer
Feb 09, 2018

                      

                        How to wire the switching power transformer


Switching power transformers contain high-frequency signals. Any printed wire on the PCB can act as an antenna. The length and width of the printed wire will affect its impedance and inductive reactance, thus affecting the frequency response. Even a printed wire passing through a DC signal may couple from the adjacent printed wire to the RF signal and cause circuit problems (even re-radiate an interference signal). Therefore, all printed lines with alternating current should be designed to be as short and wide as possible, which means that all components connected to the printed lines and connected to other power lines must be placed in close proximity.


    The length of the trace is directly proportional to the amount of inductance and impedance it exhibits, and the width is inversely proportional to the inductance and impedance of the trace. The length reflects the wavelength of the response of the printed line. The longer the length, the lower the frequency at which the printed line can send and receive electromagnetic waves, it can radiate more RF energy. According to the size of the printed circuit board current, try to increase the width of the power cord and reduce the loop resistance. At the same time, the direction of the power line and the ground line and the direction of the current are the same, which helps to enhance the anti-noise ability.


Grounding is the bottom branch of the four current loops of the switching power supply. As a common reference point of the circuit, it plays an important role. It is an important method to control interference.

    Therefore, careful consideration should be given to the placement of the grounding wire in the layout. Mixing various groundings will cause unstable power supply operation.

   When performing global cabling, the following principles must also be followed:

    (1) Direction of wiring: From the view of the soldering surface, the orientation of the components is kept as much as possible in accordance with the schematic diagram. The wiring direction is preferably the same as the wiring pattern of the circuit diagram. Because the production process usually requires various parameters at the soldering surface. Detection, so it is easy to do in the production of inspection, commissioning and maintenance (Note: refers to the circuit to meet the performance and overall installation and panel layout requirements under the premise).

    (2) When designing the wiring diagram, make the traces as small as possible. The line width on the printed arc should not be abrupt. The corners of the wires should be ≥90 degrees. Strive to make the lines simple and clear.

    (3) Cross-circuits are not allowed in printed circuits. For lines that may intersect, "drilling" and "winding" can be used to solve the problem. That is, a certain lead is “drilled” from the gaps under the feet of other resistors, capacitors, and triodes, or “wrapped” from one end of a lead that may cross. In a special case, how the circuit is complicated may be simplified to simplify the design. Connect with wires to solve cross-circuit problems. Due to the use of a single panel, the in-line component is located on the to p plane and the surface-mount device is located on the bottom surface, so in-line devices can overlap the surface-mount device during layout, but pad overlaps should be avoided.


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