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Which is better between switching power supply and linear power supply?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.03.27
With the continuous popularization and diversification of electronic devices, the requirements for power supply have become increasingly strict. In the field of power supply, switch mode power supply and linear power supply are two common technology choices, but they have significant differences in performance and environmental protection. Which is more popular between switch mode power supplies and linear power supplies?


linear power supply



Switching power supply


Performance comparison

Efficiency

Switching power supply：It has a high efficiency, usually reaching over 80%, and some can even exceed 90%. This makes it more efficient in terms of power consumption and energy utilization. Known for its high efficiency. By operating high-frequency switches, higher energy conversion efficiency can be achieved, converting input energy into output energy and reducing energy waste.

Linear power supply: have lower efficiency, typically between 60-75%, which means they generate more heat during the energy conversion process. Although the structure is simple, its efficiency is relatively low. When the current flows through the power supply, more heat is generated, causing a portion of the electrical energy to be lost in the thermal energy.

Volume and weight

Switching power supply：Due to the use of advanced high-frequency switching technology, switching power supply usually has a smaller volume and lighter weight, suitable for scenarios sensitive to space and weight requirements.

Linear power supply：The structure is relatively simple, but its transformer is large, the volume is relatively large, and the weight is also heavy.

Stability

Switching power supply: The output voltage is relatively stable, suitable for applications sensitive to voltage fluctuations, such as precision instruments and communication equipment.

Linear power supply: The output voltage is relatively constant, but may fluctuate when the load changes significantly.

Environmental impact

Energy utilization efficiency

Switching power supply: High efficiency means more efficient use of electricity, reducing energy waste, and having a positive impact on energy protection and environmental protection.

Linear power supply: Relatively low efficiency may lead to more electrical energy being converted into thermal energy, increasing energy waste.

Materials and Resources

Switching power supply: The materials used in the manufacturing process are relatively less, which is more in line with the principles of sustainable development and reduces the demand for resources.

Linear power supply: Manufacturing may require more raw materials and consume more resources.

Disposal of waste

Switching power supply: Due to its small size, it generates relatively less waste and is easier to handle and recycle, which helps reduce the burden on the environment.

Linear power supply: With a larger volume, it may generate more waste, and the treatment may be relatively complex, requiring more environmental protection measures.

When choosing a power source, it is necessary to weigh these factors according to the specific application scenario requirements. If space, weight, and energy efficiency are key considerations, switch mode power supplies may be more suitable. However, linear power sources may still be a better choice in certain scenarios with strict requirements for electromagnetic interference.
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