Power adapters, as power supply conversion devices for electronic devices and appliances, have a variety of types and can be classified from multiple dimensions:

1. Classified by modulation method:

Pulse width modulation type switch regulated power adapter: adjusts the output voltage by changing the pulse width.

Frequency modulation switch regulated power adapter: adjusts the amplitude of the output voltage by changing the oscillation frequency of the oscillator.

2. Classified by incentive methods:

It is divided into self-excited and other-excited

3. Classified by output voltage:

5V power adapter: mainly used for low-power devices such as USB devices and mobile phones.

9V power adapter: commonly used in some audio devices and small household appliances.

12V power adapter: used for some household appliances, routers, and other devices.

19V, 19.5V, 20V and other power adapters: used for devices such as laptops.

24V power adapter: usually used for some high-power devices, such as LED lighting products.

4. According to the location of the classification, divided into desktop and wall.

5. Classified by connection method:

Plug in adapter: directly plug into the power outlet.

USB adapter: Provides power to the device through a USB interface.

Fixed line adapter: The adapter comes with a fixed power cord that connects to the device’s interface.

6. Classified by technical characteristics:

Switching power adapter: Using switching power technology, it has high efficiency and is suitable for most household electronic products.

Linear power supply: The AC power is transformed through a transformer, rectified and filtered by a rectifier circuit to obtain an unstable DC voltage. To achieve high-precision DC voltage, the output voltage needs to be adjusted through a voltage feedback circuit.

7. Classified by adjustability:

Adjustable power adapter: allows users to manually adjust the output voltage to meet the needs of different devices.

In addition, power adapters can be divided into AC output type and DC output type according to output type; Divided into router adapters, printer adapters, etc. according to usage scenarios; According to the device used, it can be divided into network device adapters, electronic appliance adapters, etc.

Each type of power adapter has its specific application scenarios and advantages, and the selection needs to be comprehensively considered based on factors such as device power, voltage requirements, and usage scenarios.