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The difference between linear regulated power supply and switching power supply

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.05.29
Basic working principle

1. Linear regulated power supply

Linear regulated power supply is a common DC power supply, whose basic working principle is to convert the input power (usually mains) into DC voltage through components such as transformers, rectifiers, and filters, and then adjust the output voltage through transistors or tubes to maintain it within the set range. Linear regulated power supplies have the characteristics of high output stability, low ripple and noise, and are suitable for situations that require high output voltage.

2. Switching power supply

Switching power supply is a new type of power supply, whose basic working principle is to convert the input power supply into high-frequency AC power through a converter, and then output DC power through components such as rectification and filtering. Switching power supplies have the advantages of high output efficiency, small space occupation, high reliability, and are suitable for situations that require high output voltage and efficiency.

Comparison of applicable scenarios

1. Applicable scenarios for linear regulated power supplies

Linear regulated power supplies are mainly suitable for situations that require high output voltage stability and ripple noise, such as precision instruments, audio equipment, communication equipment, etc. Meanwhile, due to the small output voltage ripple of linear regulated power supplies, they will not cause electromagnetic interference to the powered equipment, making them suitable for situations with high electromagnetic compatibility requirements.

2. Applicable scenarios for switching power supplies

Switching power supplies are mainly suitable for high-power applications, such as computers, servers, etc. Due to its high output efficiency, switch mode power supplies do not generate excessive heat, making them suitable for situations with high heat dissipation requirements. In addition, due to its small size, switch mode power supplies are suitable for situations with high volume requirements.

Comparison of advantages and disadvantages

1. Advantages and disadvantages of linear regulated power supply

Linear regulated power supply has high output voltage stability, low ripple and noise, and can meet the requirements of high output accuracy and stability. However, due to the need for transistors or tubes in both the rectifier and regulator sections, the efficiency is very low, resulting in excessive heat generation and a certain lifespan issue, resulting in a shorter lifespan.

2. Advantages and disadvantages of switching power supplies

Switching power supplies have high output efficiency, small space occupation, high reliability, and long service life, making them suitable for situations that require high output voltage and efficiency. However, due to the fact that switching power supplies convert input power into high-frequency AC power and then perform rectification, filtering, and other components to output DC power, they have certain ripple and noise in the output voltage, making them less suitable for situations that require high accuracy and stability of the output voltage.

In summary, linear regulated power supplies and switching power supplies each have their own advantages and disadvantages, and specific application scenarios need to be selected according to actual needs.
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