source:Industry News Popular:adapter release time:2021-12-29 13:41:49 Article author:sznbone
1. Determine your power and input voltage. The switching current of the switching tube, the volume of the transformer, and the input voltage are determined by the power supply power to determine the withstand voltage of the switching tube and the number of input turns of the transformer.
2. Regardless of the voltage and power, the field tube must have a low-pass discharge and fast charge circuit.
3. The transformer must have an absorption circuit to absorb harmonics.
4. The internal resistance of the field tube grid should be pulled down with resistance grounding.
5. It is necessary to select the appropriate switching frequency to ensure that the static power loss is minimized and the field tube conversion efficiency is the highest.
6. When the input voltage exceeds 75V, the resonant circuit should be considered as a negative auxiliary function circuit.
7. When the power is too large, the PFC circuit should be tested and inserted into the design.
8. The drive signal must be stable! And it must be above 5V.
What is the qualification standard for the power adapter?
Generally speaking, the more certified power adapters, the more reliable the quality. The power supplies currently sold in the market must pass the compulsory 3C certification system before they can be sold. The existing 3C certificate has four versions: CCC (S) safety certification, CCC (SE) safety and electromagnetic compatibility certification, CCC (EMC) electromagnetic compatibility certification, CCC (F) fire certification. Among them, CCC(S) only means that the safety standards have been passed.
The CCC (S&E) certification standard that is being used, it puts forward two requirements for safety and electromagnetic compatibility for the power supply. If you see the CCC (S&E) mark on the power supply, it can be understood that it has passed the 3C certification, which is also any power supply The standard that the product must meet does not mean that its quality is excellent. Some minors will use forged signs to deceive consumers without passing the 3C certification.
In addition to the 3C certification, the UL certification mark will also be seen on some advanced power supplies. It is one of the current strict certifications and has relevant restrictions on the structure, materials, test equipment and methods of the power supply. Therefore, the general quality of the power supply with the UL certification mark is guaranteed.
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