source:power adapter Popular:adapter release time:2021-10-15 09:45:59 Article author:sznbone
Analysis of the load of the power adapter one by one
1. The process problem of the transformer
①The dipping paint is not dried in place, which causes the magnetic core to be weak, causing mechanical vibration and noise;
②The length of the air gap is not suitable, which causes the transformer to be unstable and make noise;
③The wire package is not tightly wound and it may cause noise;
④The magnetic core combination has an air gap, which causes air vibration at high frequency and makes a sound (if the transformer is fully immersed in vacuum, and the epoxy resin in the center pillar, the epoxy resin between the skeleton and the magnetic core-refer to the frame below The position, generally does not make a sound).
2, the loop problem of the transformer
The loop problem of the transformer means that the loop of the transformer oscillates, which causes the transformer to squeal.
①Improper wiring of the circuit board, causing interference to cause oscillation, resulting in noise;
②Improperly set the feedback loop parameters, which causes the loop to be unstable and cause oscillation and noise;
③Quality problems of components in the loop, such as insufficient input filter capacitor capacity, poor quality output rectifier fast recovery diodes, poor quality power MOS tubes, poor quality high-voltage capacitors or diodes in the RCD recoil absorption loop, etc. Problems can cause vibrations and noises.
3. The core problem of the transformer
When the transformer core is saturated, the current in the coil increases, the transformer heats up and produces self-excited oscillation, and the oscillation of the coil causes the surrounding air to vibrate and make noise.
4. The load problem of the power adapter
① In the case of no load or light load, the power adapter will oscillate at certain operating points, which is manifested as the howling of the transformer and the unstable output.
This phenomenon occurs because when the switch is under no load or light load, the instantaneous turn-on time of the switch is too large, which causes the output energy to be too large, and the voltage overshoot is also large, and it takes a long time to recover to the normal voltage, so the switch needs to stop working For a period of time, this switch works in an intermittent working mode, causing the transformer to vibrate at a lower frequency (a regular intermittent full cut-off period or a frequency where the duty cycle changes drastically).
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