source:Industry News Popular:adapter release time:2022-04-19 09:48:54 Article author:yu
When the low-power switching power adapter is conducting the conducted interference test, due to its relatively small power, the received radiated signal strength is much weaker than that of the high-power adapter. Therefore, during the test, the engineer needs to comprehensively refer to the amplitude of the conducted interference. The size of the value needs to be fully considered in the design of the influence of electromagnetic interference. Below we will further explain the causes of electromagnetic interference and noise by analyzing the general mechanism of low-power power adapters.
At present, the low-power switching power supplies produced in our country can be subdivided into series-parallel and DC conversion according to their different circuit structures.
The commercial power will be converted into a DC voltage after being rectified and filtered once, and sent to the switching inverter circuit through the circuit system. The inverter circuit converts the DC into a high-frequency rectangular wave of several hundred Hz to several kilohertz. The high-frequency rectangular wave is coupled to the secondary coil through a high-frequency transformer to obtain a small-voltage alternating current. This alternating current is output after secondary rectification and filtering to drive load. At the same time, the output voltage value obtained by sampling the error amplifier circuit is fed back to the pulse control circuit. The pulse control circuit compares the feedback voltage value with the reference voltage value to obtain a corresponding change action of the pulse duty cycle, which will generate strong noise during the switching operation. Conduct outward. This is also the biggest reason why most small power adapters have noise problems.
Summarize
In addition to the causes of noise mentioned above, the switching power adapter is also a very sensitive device, and the external noise invaded by the power grid will also cause interference in the process of transferring to the internal electronic circuit. Therefore, electromagnetic interference should be considered at the beginning of designing a switching power supply.
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