Power adapter in the process of use may sometimes be subject to interference from external factors, so how should we solve this interference? Such as power line harmonic current, power line conduction interference, electromagnetic field radiation interference, etc., can only be solved by reducing the interference.
On the one hand, you can enhance the input / output filter circuit design, improve the performance of the active power factor compensation (APFC) circuit, reduce the switching tube and rectifier, current-continuing diode voltage, current change rate, the use of a variety of soft switching circuit topology structure and control methods, etc.; on the other hand, strengthen the shielding effect of the chassis, improve the gap leakage of the chassis, and good grounding treatment.
To the external anti-interference ability, such as surge, lightning strike, should optimize the AC input and DC output port lightning protection ability. For lightning strikes can be solved by using a combination of zinc oxide varistors and gas discharge tubes and other methods. For electrostatic discharge, the use of TVS tube and the corresponding grounding protection, increase the distance between the small signal circuit and the chassis, etc., or the choice of devices with anti-static interference to solve.
Reduce the internal interference of the power adapter, should start from the following aspects：
1. pay attention to the digital circuit and analog circuit single point grounding, high current circuit and small current, especially current, voltage sampling circuit single point grounding, in order to reduce common resistance interference, reduce the impact of the ground loop.
2. pay attention to the spacing between adjacent lines and the nature of the signal when wiring to avoid crosstalk.
3. reduce the impedance of the ground; reduce the area surrounded by high-voltage high-current lines, especially the original side of the transformer and switching tubes, power supply filter capacitor circuits.
4. reducing the area enclosed by the output rectifier circuit and the current-continuing diode circuit and the DC filter circuit.
5. reduce the leakage inductance of the transformer, the distribution capacitance of the filter capacitor; the use of high resonant frequency filter capacitors, etc.
For more information about power adapter, please pay attention to Shenzhen BON Electronics Co.，LTD.
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