Understanding the Operating Frequency of Linear Power Supplies- Key Insights and Applications

What is the operating frequency of linear power supply?

The operating frequency of a linear power supply refers to the frequency at which the power supply operates, which is an important parameter in the design and selection of linear power supplies. It is closely related to the efficiency, stability, and electromagnetic interference of the power supply. In this article, we will explore the concept of operating frequency, its influence on the performance of linear power supplies, and the factors affecting the operating frequency.

The operating frequency of a linear power supply is mainly determined by the transformer and the switching frequency of the switching power supply. In a traditional linear power supply, the transformer works at a fixed frequency, usually 50Hz or 60Hz, depending on the country’s power grid standard. In this case, the operating frequency of the linear power supply is the same as the transformer frequency.

However, in modern switching power supplies, the operating frequency is generally higher, often ranging from several tens of kHz to several MHz. The high operating frequency allows the transformer to be miniaturized and the switching devices to be reduced in size, which is beneficial for improving the efficiency and reducing the cost of the power supply.

The operating frequency of a linear power supply has a significant impact on its performance. The following are some of the factors affected by the operating frequency:

1. Efficiency: The higher the operating frequency, the higher the efficiency of the power supply. This is because the switching devices can switch faster, reducing the conduction loss and switching loss.

2. Stability: The operating frequency affects the stability of the power supply. A higher operating frequency can improve the stability of the output voltage and reduce the impact of load changes.

3. Electromagnetic interference: The operating frequency affects the electromagnetic interference generated by the power supply. A higher operating frequency can reduce the electromagnetic interference, which is beneficial for the power supply to meet the electromagnetic compatibility requirements.

4. Heat generation: The operating frequency affects the heat generation of the power supply. A higher operating frequency can reduce the heat generation, which is beneficial for improving the reliability of the power supply.

In summary, the operating frequency of a linear power supply is an important parameter that affects its performance. The selection of the operating frequency should be based on the specific application requirements and the characteristics of the power supply.