In China's residential electricity grid voltage access is 220V, which is actually a theoretical value approximation. Due to the loss in the transmission process, or the use of many users at the same time, it is difficult to ensure that the standard 220V voltage is always provided. The industry recognizes that a reasonable and consistent design is to design a power supply with reference to the grid conversion efficiency of 0.7. Many young engineers often design values according to the theoretical 220V due to lack of experience. The result is that if the power is to be stabilized, the actual operating current is actually greater than the design current.

In addition to the power factor of the grid, another important factor to consider when designing a power supply product is the power conversion efficiency. Because the designed power supply product itself is also a power device, it also consumes a part of the power, so it will not be converted and effectively applied fully. At present, the power conversion efficiency of the industry is generally based on the ratio of 80%-85%. If the young engineer does not consider this factor when designing the circuit, the result is still to stabilize the output power, then the actual operating current is actually greater than the design current.

The most direct result of the actual operating current being greater than the design current is to cause heat. Although the voltage drop will decrease as the temperature rises gradually, the leakage current will gradually increase, which will affect the conversion efficiency of the power supply. If the original ratio is not enough, there will even be serious quality accidents such as bombing, which will bring serious life and property safety threats to customers and users.

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