Switching Power Supply Introduction
A switching power supply is an electronic device that converts AC power into DC power, playing a crucial role in power supply equipment. It not only provides stable power output and achieves high efficiency and energy savings, but also supports a variety of output voltage requirements, making it widely used in various scenarios. However, many people are concerned about the noise problem of switching power supplies. Today I will introduce to you the causes of switching power supply noise and how to solve it.
Causes of Switching Power Supply Noise
1. Magnetic Field Interference: The high-frequency magnetic field in a switching power supply can interfere with other nearby electronic devices, causing electromagnetic radiation noise.
2. Parallel Capacitors: Parallel filter capacitors in a switching power supply can also generate noise, usually high-frequency noise.
3. Drive Voltage: The drive circuit of a switching power supply is a high-frequency circuit. Due to the transmission characteristics of high-frequency signals, the drive voltage can generate radio frequency interference, which can affect the operating stability of the switching power supply.
4. Inductor Leakage: Inductor leakage in a switching power supply can also contribute to noise.
How to reduce the noise of switching power supply
1.Reduce the noise of capacitor parallel connection The parallel connection of capacitors in switching power supply is the main source of high-frequency noise. In order to reduce the noise of capacitor parallel connection, the following measures need to be taken:
(1) Use organic electrolytic capacitors: The capacitance of organic electrolytic capacitors is relatively small, and the noise generated accordingly is also small.
(2) Use multiple small-capacitance capacitors in parallel: Multiple small-capacitance capacitors in parallel can share the noise generated by capacitor parallel connection.
(3) Use independent power supply: Independent power supply can effectively reduce the noise generated by capacitor parallel connection.
2. Shielding is an effective noise reduction method. By using appropriate shielding materials, the interference between electronic equipment and the surrounding environment can be effectively reduced. The shielding performance can be improved and the number of shielding layers can be increased to strengthen the shielding.
3. Reduce the driving voltage noise The driving voltage of the switching power supply is one of the main factors that generate noise. In order to reduce the noise of the driving voltage, the following measures can be taken:
(1) Select a suitable power supply: Selecting a power supply with more stable working performance can greatly reduce the impact on the noise generated by the switching power supply.
(2) Reduce the noise of the driving voltage: The noise of the driving voltage can be reduced by using power filter capacitors, magnetic beads, torque magnetic rings, TLPI networks, etc.
4. Reduce the inductor leakage noise
Inductor leakage is also one of the causes of switching power supply noise. In order to reduce the inductor leakage noise, the following measures can be taken:
(1) Select high-quality inductors: Selecting high-quality raw materials for inductors can greatly reduce the inductor leakage noise.
(2) Use magnetic shielding technology: Using magnetic shielding technology in key parts can effectively reduce the noise generated by inductor leakage.
Summary
The noise problem of switching power supplies has always been one of the difficult problems that electronic engineers have to face. In order to reduce the noise of switching power supplies, it is necessary to analyze the causes of the noise and take corresponding measures to intervene. The above are only some common noise solutions. In fact, the causes of switching power supply noise are more complicated, and the specific solutions need to be determined according to the specific situation.
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