Application of low voltage MOS in variable frequency fan

1. Introduction

A variable frequency fan is a fan that uses variable frequency technology to adjust its speed; it changes the fan speed by changing the operating frequency of the motor to achieve different air volume changes, transforming an ordinary single-frequency motor into a motor that supports variable frequency and controlling it with a frequency converter.

The inverter fan has the following characteristics:

1. Energy saving and high efficiency: The variable frequency fan uses variable frequency technology to adjust the motor speed. It can adjust the wind speed according to the environment and usage requirements to achieve energy saving effects, with a power saving rate of more than 30%.

2. Low noise: Compared with traditional fans, variable frequency fans have a more stable speed, can effectively reduce noise pollution, and are more comfortable to use.

3. Lightweight and easy to carry: The inverter fan is light as a whole and easy to carry.

4. Safe and reliable: The inverter has built-in multiple protection mechanisms, such as overcurrent, overload, short circuit and other protection functions, making it safer and more reliable to use.

Application of low voltage MOS in variable frequency fan

2. Product application working principle and advantages

Variable frequency fans are widely used in industrial production and family life. The working principle is to control the speed of the motor by adjusting the frequency and voltage of the input signal through the inverter, thereby driving the fan blades to rotate and generate airflow. This speed regulation method has the advantages of high flexibility, high energy efficiency, stable air volume and low noise.

Advantages of Ruisen Semiconductor's low voltage MOS series products:

• In terms of VDS withstand voltage, the withstand voltage performance can be guaranteed;

• High Vth consistency, suitable for multi-tube parallel connection;

• In terms of pulse drain current Id(pluse), it can resist high surge current shock;

• In terms of MOS tube conduction loss, it has lower conduction loss and can save energy.

3. Typical application topology diagram

Variable frequency fan brushless DC motor topology circuit

4. Typical application cases and selection

Nowadays, fans are developing towards variable frequency fans, which leads to the upgrade of electric fan motors; in the past, all motors were AC rated motors, but now electric fans will choose DC variable frequency motors. As a control device for brushless DC motors, the quality and performance of MOS tubes are particularly important. As a total solution provider for power devices, Ruisen Semiconductor has won the trust and support of many brands for its advanced production technology, superior performance and good reputation in low-voltage MOS series products.

Ruisen Semiconductor mainly promotes the low-voltage MOS series in variable frequency fan products, and recommends the following product selection table:

Selection of low voltage MOS products for variable frequency fan brushless DC motor