source:power adapter Popular:adapter release time:2021-08-19 09:38:47 Article author:sznbone
There may be some malfunctions in the power adapter during use. Among them, interference is a headache for many people, so how to solve this problem? Let's follow the power adapter manufacturer to understand it!
1. External interference:
The external interference to the power adapter, such as power line harmonic current, power line conduction interference, electromagnetic field radiation interference, etc., can only be solved by reducing interference. On the one hand, it can enhance the design of the input/output filter circuit, improve the performance of the active power factor compensation (APFC) circuit, reduce the voltage and current rate of change of the switch tube, rectifier, and freewheeling diode, and adopt various soft switching circuit extensions. Repair structure and control methods, etc.; on the other hand, strengthen the shielding effect of the case, improve the leakage of the gap of the case, and conduct a good grounding treatment.
For external anti-interference capabilities, such as surges and lightning strikes, the lightning protection capabilities of AC input and DC output ports should be optimized. Lightning strikes can be solved by a combination of zinc oxide varistors and gas discharge tubes. For electrostatic discharge, use TVS tubes and corresponding grounding protection, increase the distance between large and small signal circuits and the chassis, or select devices with anti-static interference.
2, internal interference:
To reduce the internal interference of the power adapter, you should start with the following aspects: pay attention to the single-point grounding of the digital circuit and the analog circuit, the single-point grounding of the large current circuit and the small current circuit, especially the current and voltage sampling circuit, to reduce common resistance interference, Reduce the influence of the ground ring; pay attention to the distance between adjacent lines and the nature of the signal when wiring to avoid crosstalk; reduce the impedance of the ground line; reduce the high-voltage and large-current lines, especially the primary side of the transformer, the switch tube, and the power supply filter capacitor circuit. The area enclosed; reduce the area enclosed by the output rectifier circuit and the freewheeling diode circuit and the DC filter circuit; reduce the leakage inductance of the transformer and the distributed capacitance of the filter capacitor; use a filter capacitor with a high resonance frequency.
According to the elements of electromagnetic compatibility, solving the electromagnetic compatibility of the power adapter can start from three aspects:
1, reduce the interference signal generated by the interference source;
2, cut off the propagation path of the interference signal;
3. Enhance the anti-interference ability of the interfered body.
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