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Learn about power adapters

What is a power adapter?

Power adapter is a power supply conversion equipment for small portable electronic equipment and electronic appliances. It is generally composed of shell, transformer, inductance, capacitance, control IC, PCB board and other components. Its working principle is converted from AC input to DC output. It can be divided into wall-plug and desktop according to the connection mode. It is widely used in security cameras, set-top boxes, routers, lamps, massagers and other equipment.

Power adapter, also known as external power supply, is a power supply voltage conversion device for small portable electronic devices and electronic appliances. It is commonly used in small electronic products such as phones, liquid crystal displays and notebook computers.

Structure of power adapter

Among them, DC/DC converter is used for power conversion, which is the core part of power adapter. In addition, there are start-up, over-current and over-voltage protection, noise filtering circuit output sampling circuit (R1R2) to detect the change of output voltage, and compare the error voltage with reference voltage U. The error voltage is amplified and pulse width modulation (PWM) circuit, and then through the drive circuit to control the duty cycle of power devices, so as to achieve. The purpose of adjusting the output voltage.

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