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The Disadvantages and Shortcomings of Switching Power Supplies

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.04.16
1. Poor stability

One of the common problems with switching power supply is their poor stability. Due to the use of switching tubes or transistors for switch control in switching power supplies, electromagnetic induction may occur when the switching tubes or transistors are turned off, resulting in a sharp change in inductive current. This type of electromagnetic induction can cause the problem of instantaneous sudden changes in output voltage, resulting in significant fluctuations in the output voltage of the switching power supply.

2. Serious EMI interference

Another disadvantage of switching power supply is that their EMI (electromagnetic interference) interference is more severe. Due to the high-frequency switching dynamic characteristics of switching power supplies, a large amount of high-frequency noise may be generated, which can easily interfere with surrounding electronic devices and signals, thereby affecting the output quality of audio, video, and other aspects.

3. Relatively high cost

Switching power supplies are relatively more expensive than traditional transformer power supplies. Switching power supplies require the use of multiple electronic components, some of which are expensive and require additional processes such as processing, testing, and debugging. Therefore, in terms of the same power output and performance, switching power supplies are usually more expensive than transformer power supplies.

4. Large output ripple

The output ripple of switching power supply is large, which is unfavorable for electronic devices that require small output power ripple. Due to the use of switching technology for output in switching power supplies, high-frequency noise may be generated during the switching process, which may result in instantaneous voltage fluctuations and ripple in the output voltage.

5. Short lifespan

The lifespan of switching power supply is usually shorter than that of traditional transformer power supplies. Due to the working principle of switching power supply supply, its electronic components need to be constantly switched on and off according to time and usage conditions, which can lead to wear and aging of electronic components. During long-term use, electrolytic capacitors in switching power supplies often experience a decrease in capacitance value, leading to a decrease in the stability of the switching power supply.

In summary, although switching power supply are widely used in modern electronic devices, they have some shortcomings and shortcomings in terms of stability, EMI interference, cost, output ripple, and lifespan. However, with the advancement of technology, switching power supply supply technology is also constantly being optimized and upgraded, such as inverter power supply, flying rotor motor driver, etc. These technologies are striving to solve the shortcomings of switching power supply supply and provide more reliable power supply for electronic devices.
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