High quality power adapter teaches you the safety specifications of power supply:

When using a PC power supply, it is possible to be connected incorrectly or short circuited. In addition, the power supply itself may also malfunction, resulting in abnormal output voltage. Therefore, safety specifications are a very important part of the design and manufacturing of power supplies. There are two aspects to protecting the power supply, one is to prevent burning other accessories, and the other is to protect oneself from damage.

The main external protection of the power supply is overvoltage and undervoltage protection, which means that when the output voltage of the power supply is abnormally high or low, the power supply must stop working. This is very important for the entire machine, as all expensive components such as CPU, hard drive, etc. are relatively fragile and easily burned out due to high voltage.

To prevent this situation, it is necessary to monitor each output voltage of the power supply. The method of the power supply designer is to sample the output voltage through a sampling circuit, and the sampled signal is sent to the control part through a comparator. Once the output voltage is abnormal, the sampling signal is immediately reflected and the control part is notified to shut down. This can effectively protect valuable components such as the motherboard, CPU, memory, hard drive, and optical drive. Does the power supply have

Fast overvoltage protection is crucial for the entire machine. To prevent excessive current from causing burnout, power supplies are equipped with fuses.