Different electronic products have different requirements for the power adapter. For example, the monitor has higher requirements for ripple. If the ripple is too high, the screen will flash. Today, let's popularize what will interfere with the power adapter:
1. Reduce the area surrounded by high-voltage and high current lines, especially the primary side of transformer, switch tube and power filter capacitor circuit; Reduce the area surrounded by the output rectifier circuit, the freewheeling diode circuit and the DC filter circuit; Reduce the leakage inductance of transformer and the distributed capacitance of filter capacitor; Filter capacitor with high resonance frequency shall be adopted.
2. To reduce the internal interference of power adapter, we should start from the following aspects: pay attention to the single point grounding of digital circuit and analog circuit, and the single point grounding of large current circuit and small current circuit, especially current and voltage sampling circuit, so as to reduce the common resistance interference and the influence of grounding ring; Pay attention to the spacing between adjacent lines and the signal nature during wiring to avoid crosstalk; Reduce ground impedance. For electrostatic discharge, TVs tube and corresponding grounding protection shall be used to increase the distance between large and small signal circuits and chassis, or devices with anti-static interference shall be selected to solve the problem.
3. For external anti-interference capability, such as surge and lightning strike, the lightning protection capability of AC input and DC output ports shall be optimized. The combination of zinc oxide varistor and gas discharge tube can be used to solve the lightning stroke.
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