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Will connecting a DC switching power supply to AC power by mistake cause damage?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.05.13
Whether a DC switching power supply will be damaged if AC power is mistakenly connected depends on the design and protection mechanism of the switching power supply. Modern switching power supplies are usually designed with multiple protection functions, including overvoltage protection, overcurrent protection, short circuit protection, and input voltage protection. However, these protective measures are mainly aimed at preventing issues on the output side, rather than incorrect input power supply types.

Switching power supplies are typically designed to convert AC input into DC output, so their input portion is designed to handle AC power. If you are referring to mistakenly connecting a switching power supply designed for DC input (such as car power, battery, etc.) to an AC power supply, in this case:

There is a dedicated AC input design: If the switching power supply has a wide input range and is clearly marked as capable of accepting AC inputs (for example, some devices can accept a wide range of inputs from DC to AC, such as DC 12V to AC 240V), then connecting to AC may not cause damage. However, this situation is relatively rare and limited to specific designed devices.

No AC input design: Most DC switching power supplies do not expect to receive AC power as input. In this case, if the AC power supply is directly connected to the input terminal originally designed to receive DC power, it is likely to damage the internal circuit of the switching power supply, because the voltage fluctuation of the AC power supply may exceed the tolerance range of the DC input circuit, leading to circuit overvoltage, overheating, and even burnout.

In summary, if a DC switching power supply is mistakenly connected to AC power and the power supply is not designed to handle this type of input, it is highly likely to cause damage. It is always recommended to carefully read and follow the equipment manual to ensure proper power connection and avoid potential damage. If you are unsure about the input specifications of the device, it is best to consult the manufacturer or a professional.
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