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Why does a switch mode power supply need to be connected to a dummy load?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.03.28
In the design and debugging process of electronic devices, many electronic engineers will encounter a situation where the switching power supply is connected to a dummy load. Although the advantage of doing so is to protect the power supply itself and improve the stability and reliability of the circuit, few people know the reason carefully. Therefore, the following will discuss this issue in detail.



1. Why does a switching power supply need to be connected to a dummy load?

When the switching power supply is working, if the load is not connected or the load is too light, it may cause the output voltage of the power supply to be too high, which can damage the power supply or other circuit components,

Connecting dummy load can simulate real loads, allowing the switching power supply to operate stably even under no-load or light loads, avoiding excessive output voltage.

2. What are the benefits of using a dummy load in a switching power supply?

① Protecting power supply

It can effectively prevent the output voltage of the switching power supply from being too high during no-load or light load, thereby protecting the power supply from damage;

② Improve stability

It can simulate actual loads and ensure that the switching power supply can maintain a stable working state under various load conditions;

③ Easy to debug

During the circuit debugging phase, connecting dummy loads can facilitate engineers to observe and test the output performance of the power supply, thereby optimizing circuit design.

3. What circuits are suitable for dummy load?

① Switching power supply circuit
② Power amplification circuit
③ Signal generation circuit

4. Precautions for receiving dummy load

① Choose the appropriate dummy load
② Avoid prolonged use
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