How is the adjustable switching power supply howling? How to suppress howling?

How is the adjustable switching power supply howling? How to suppress howling? During the test of the adjustable switching power supply, we often hear the sound of electric leakage like when the high voltage is bad, sometimes like the sound of high voltage arcing, we generally call it the power supply howling.



Adjustable switching power supply howling

Howling of adjustable switching power supply

1. Improper PCB design: the power consumption line is too long, and is too close to the drain wiring of the MOS tube, the current ground and the control loop ground share a common wiring, the chip VCC power wiring is too long or away from the dt / di current wiring Too close.

2. Poor transformer impregnation: The gaps between the coil and the coil, between the coil and the skeleton, and between the skeleton and the magnetic core are not well filled, which causes displacement of the moving parts and makes the adjustable switching power supply produce abnormal noise during use.

3. Capacitance piezoelectric effect: The non-linear insulating material in the small ceramic capacitor contains a large proportion of barium titanate, which will produce a piezoelectric effect during work, resulting in abnormal noise of the adjustable switching power supply.

4. Other



Adjustable switching power supply internal transformer and capacitor, etc.

Howling suppression method for adjustable switching power supply

1. The power consumption line should be as short as possible, and it should be far away from the drain wiring of the MOS tube. The signal ground should be independently routed as far as possible from the power ground. Widen the power and ground traces to reduce the power line and ground line. Impedance, increase the distance between traces to reduce capacitive coupling crosstalk, etc.

2. The transformer needs to be evenly impregnated to reduce the possibility of displacement of the moving parts, and the peak magnetic flux density should be reduced as much as possible under the conditions.

3. Replace the high-voltage ceramic capacitor used in the absorption circuit with a polyester film capacitor with less electrostrictive effect.

4. Other



Adjustable switching power supply PCB circuit board

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