Everyone is aware of the wide application of multi-voltage AU adapters nowadays. But how to design a good one? What are the qualified standards? I'm sure most people don't know this. So let's take a look together today.
How to design a good multi-voltage AU adapter?
How to design a good multi-voltage AU adapter?
Determine your power supply power and input voltage. The switching current of the power transistor is selected based on the power supply power. The volume of the transformer, as well as the input voltage, determines the withstand voltage of the power transistor and the number of input windings of the transformer.
2. Regardless of the voltage or power of the power supply, all field tubes must have low-pass discharge and rapid charging circuits.
3. The transformer should have an absorption circuit to eliminate harmonics.
4. The internal resistance of the field control grid needs to be reduced by applying a ground connection with a resistor.
5. It is necessary to select an appropriate switching frequency to ensure that the static power loss is minimized while maintaining the highest efficiency of the field tube conversion.
6. When the input voltage exceeds 75V, the resonant circuit should be considered as a supplementary functional circuit.
7. When the power is too high, one should consider the design of the PFC circuit connection.
8. The driving signal must be stable! And it should be 5V or higher.
What are the qualified standards for the multi-voltage AU adapter?
Generally speaking, the multi voltage AU adapter with more certified features is of higher quality. Currently, all power supplies sold in the market must undergo the mandatory 3C certification process before they can be sold. The existing 3C certificates have four versions: CCC
safety certification, CCC(SE) safety and electromagnetic compatibility certification, CCC(EMC) electromagnetic compatibility certification, and CCC
fire protection certification. Among them, CCConly indicates that it has passed the safety standards.
The currently used CCC (S&E) certification standard sets two requirements for power supplies: safety and electromagnetic compatibility. If you see the CCC (S&E) logo on a power supply, it means it has passed the 3C certification. This is the standard that any power supply product must meet, but it does not indicate that the quality is excellent. Some small manufacturers may use counterfeit logos without having passed the 3C certification to deceive consumers.
Apart from the 3C certification, on some high-end power supplies, you may also see the UL certification mark. It is one of the current strict certifications, with relevant restrictions and regulations covering aspects such as the structure, materials, testing instruments, and methods of the power supply. Therefore, when you see a power supply with the UL certification mark, the quality is generally guaranteed.
That's all for the discussion on how to design a good multi-voltage AU adapter and the corresponding qualified standards. I hope this information will be helpful to everyone!
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