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Fan air volume, wind pressure, power and speed of the relationship and related calculations, fan selection
Conversion between air volume, wind pressure and power
The conversion between air volume, wind pressure, and power in fans does not follow a simple linear relationship. The performance of a fan is influenced by multiple factors including fan type, rotational speed, blade angle, duct design, and gas density.
2024 Asia Electronics (Hong Kong) Fair concluded successfully
**2024 Asia Electronics (Hong Kong) Fair concluded successfully**
The company launches advanced waterproof cooling fans to meet market demand
In response to the growing market demand, our company is proud to announce the launch of its latest range of Cooling Fans, now boasting an impressive IP68 waterproof rating. This innovative product is designed to meet the needs of a variety of applications, ensuring reliability and performance even in the most challenging environments.
Differences between AC fans and DC fans
The cooling fan can be divided into two categories from the power supply mode: AC cooling fan and DC cooling fan. It is mainly used for ventilation and heat dissipation in computer equipment, household appliances, automotive equipment, mechanical equipment and other fields. The AC cooling fan is mainly used in industrial machinery and equipment, medical equipment and other large equipment; Dc cooling fans are generally used in computer electronics, household appliances and other small equipment. In addition to these, let's look at the main differences between AC cooling fans and DC cooling fans.
Fuqingda participated in Guangzhou power supply exhibition successfully concluded
Shenzhen Fuqingda Electronic Technology Co., Ltd. announced its participation in the 2024 Guangzhou New Energy Power Supply Exhibition, the top event in the energy field. The company, known for its innovative cooling fan technology, will be showcasing a number of its latest products at the show. This event is an important platform for Fuqingda to showcase advanced technologies and establish connections with global industry leaders and potential customers.
How to Select an Optimal Cooling Fan
When selecting a cooling fan, it is essential not only to consider your specific usage requirements but also to evaluate the following critical factors:
cooling fan PWM function Introduction（2）
The speed control of the fan is generally controlled by PWM, the frequency is generally 25K to 50K, and the duty cycle is adjustable from 10% to 100%.
The input matching circuit of the PWM pin is shown in the figure below.
As can be seen from the figure, the input level inside the fan is actually matched to 3.3V, so by default the fan is running at full speed.
Regarding the PWM control of the fan, the author guessed that the input voltage of the fan should be adjusted by PWM control of the internal MOS switch, similar to the method of switching power supply to control the voltage value of the input to the motor, the higher the voltage, the faster the corresponding speed.
Cooling fan PWM function Introduction（1）
1, PWM speed control principle "Simplify
the pwm speed control principle: a pwm chip generates a square wave pulse, and its pulse is connected to a triode level, if there is a high level on this level, the other poles of the triode are in the on-state, if it is low, the other poles are in the disconnected state.
If the duty cycle of the emitted square wave pulse signal is 50%, that is, the high level signal accounts for half the time of a cycle, then the triode is in the on-state for 1 1/2 time in a cycle.
With the on-time of the triode in one cycle, we can easily control the fan speed.