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Reasons of noise from 24w power adapter

Reasons of noise from 24w power adapter

The power adapter is a small portable electronic equipment and electronic appliances power supply conversion equipment, generally by the shell, power transformer and rectifier circuit composition. According to its output type, it can be divided into ac output and dc output; According to the connection, it can be divided into wall type and desktop type.

Power adapters are widely used in consumer electronic products. Most of the output power provided is within 100 watts, and the market demand is growing rapidly. Applications include electric bicycle battery chargers, small LCD TV, laptops, printers, DVD players and set-top boxes. Most of the early power adapters used linear transformers. With the requirement of high efficiency and wide input voltage range of consumer electronic products for power adapters, as well as the increase of copper, iron and labor costs, the original linear transformers in these power adapters were gradually replaced by switching power supplies.

At present, the high frequency of power adapter has become its development direction. High frequency makes the switch power supply miniaturization and makes the power adapter into a wider application field, especially in the field of high and new technology, promoting the miniaturization and portability of high-tech products. In addition, the development and application of power adapter have important significance in saving energy, saving resources and protecting the environment.

Power adapters are widely used, but during the use of a 24w power adapter, they sometimes make noise.
When ac 220v changes voltage through a transformer and dc through a rectifier, there is consumption which is converted into heat, so it is normal for the power adapter to heat up. The transformer is made of a silicon steel sheet. When the transformer is energized, it will generate a magnetic flux, which will cause a force between the silicon steel sheet and thus generate a buzzing sound, but this is normal. But too much noise isn't normal, and power adapters make noise for a variety of reasons, including:
1. Short circuit between turns.
2. Component damage.
3. ac voltage is not stable.
4. Chip damage.

At this time, there is a need to go to the maintenance department for maintenance inspection.These are the reasons for the power adapter noise.

24w power adapters:
24W Plug-in Passive Gigabit PoE injector
24W AC-DC Level VI Efficient Power Adapter With DC Cord
24W IEEE 802.3af Standard PoE Spliter
24W AC/DC Constant Voltage LED Driver Power Supply

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