At a time when smart homes are developing rapidly, smart sockets, as basic and practical devices, have brought great convenience to people's lives. They can remotely control electrical switches, monitor power usage, and realize timed power on and off functions.

 1. Working principle of smart socket

The smart socket consists of a power supply, control, communication module and load interface. The power module converts the mains voltage, the control module processes instructions, the communication module is responsible for information exchange, and the load interface connects to electrical appliances. Users send instructions through the mobile phone APP, which are transmitted to the control module through the communication module, control the circuit on and off, and realize remote operation of electrical appliances.

2. Application of VBQF1303 in smart socket

1. Circuit on-off control

VBQF1303 is an N-channel MOS tube. It turns on when the gate-source voltage exceeds the 1.7V threshold, allowing the smart socket to power the appliance. It turns off when it is lower than this value, cutting off the power supply. Its gate-source voltage allows a range of ±20V, which is safe. Moreover, its on-resistance is as low as 4-5mΩ. During the frequent power on and off of the smart socket, it generates less heat and consumes less energy. It can respond to commands efficiently and accurately, and realize stable power supply control for the appliance.

(II) Overload protection

With a maximum drain current carrying capacity of 60A, VBQF1303 can handle normal use and instantaneous current shocks. When the power of the appliance connected to the smart socket is too large and the current exceeds the limit, it will monitor the circuit feedback, adjust its gate voltage, increase the on-resistance to limit the current, and cut off the circuit when necessary. Moreover, it can automatically resume conduction after the overload is removed without manual operation, effectively protecting the smart socket and connected appliances from damage due to overload.

(III) Electricity monitoring

The voltage drop and current when VBQF1303 is turned on can be used to calculate the real-time power of the appliance, providing a data basis for the power monitoring function of the smart socket, so that users can understand the power consumption of the appliance. Its stable on-resistance and precise parameter characteristics, combined with the monitoring circuit, can achieve high-precision power monitoring without affecting the normal operation of the appliance, providing a basis for users to save energy.

 3. Key points for selecting VBQF1303 in smart sockets

1. Electrical parameters

1. Withstand voltage

The 30V withstand voltage value can meet the needs of smart sockets under mains power (220V AC) and certain fluctuations, avoiding damage due to voltage problems and ensuring long-term stable operation.

2. Current carrying capacity

The maximum drain current of 60A can meet the scenario of connecting multiple high-power electrical appliances to the smart socket, ensuring normal operation during peak power consumption.

3. On-resistance

The low on-resistance reduces power loss when the smart socket is working, which is in line with the design concept of energy saving and high efficiency.

(II) Performance characteristics

1. Switching speed

Although the switch speed parameters are not clearly given, based on its type and application scenario, a fast switch response can enable the smart socket to respond to commands in a timely manner and improve the user experience.

2. Temperature stability

Groove technology helps to improve temperature stability. When the smart socket is used for a long time and generates heat, it can maintain stable performance and reduce the occurrence of failures.

3. Reliability and safety

The small package of DFN8 (3X3) not only saves internal space of the smart socket and facilitates integrated design, but also has good mechanical strength and heat dissipation performance, ensuring safe and reliable use.

 As smart sockets develop towards a smarter and more efficient direction, MOS tubes such as VBQF1303 will continue to be optimized. In the future, it is expected to make breakthroughs in further reducing on-resistance, increasing switching speed and integrating more functions, injecting new impetus into the development of smart sockets and better meeting people's pursuit of convenient and smart life.