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What is the main difference between a switching power supply and a regular power supply?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.03.25
Working principle

Ordinary power sources (such as linear power sources) typically use traditional transformers and rectifier filtering circuits to convert and regulate voltage. The current flows continuously through the entire circuit, resulting in high losses and relatively low efficiency.


linear power supply

Switching power supplies use switch converters and pulse width modulation technology. It converts direct current into high-frequency alternating current by quickly switching switching switching tubes, and then performs voltage transformation and rectification filtering through transformers to provide stable direct current output. This method can achieve efficient energy conversion and improve the efficiency of the power supply.


Switching power supply


Performance characteristics

Efficiency: The efficiency of a switching power supply is usually higher than that of a regular power supply because it operates in a switching state, reducing energy loss.

Volume and weight: The high-frequency switching characteristics of a switching power supply allow it to use smaller transformers and filters, resulting in a smaller overall volume and weight.

Voltage regulation performance: Switching power supplies have better voltage regulation performance, can provide more stable output voltage, and respond more quickly to load changes.

Noise and interference: Switching power supplies may generate certain switching noise and electromagnetic interference during operation, but modern switching power supplies can effectively reduce these effects through good design and filtering.

Cost: The cost of switching power supplies is relatively high, but in large-scale production and high demand applications, its advantages can compensate for the increase in cost.

Overall, switch mode power supplies have advantages in efficiency, volume, and voltage stability, making them suitable for most modern electronic devices. However, regular power supplies are still used in some simple and low-cost applications. The choice of power source depends on specific requirements and application scenarios.
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