Complete works of DC fan speed regulation method
First, the speed regulation of the external terminals of the DC fan: This method of speed regulation was widely used in the earliest speed regulation schemes. The speed adjustment can be achieved mainly because the DC fan has a wide voltage adaptation range. The DC fan has a wide range of voltage adaptation. It can work normally when the rated voltage is 50%, and the terminal voltage determines the speed. Therefore, most early speed controls were like this. At the same time, this speed regulation method is simple and low cost.
The second is the speed control of the internal logic control circuit of the DC fan: it is to add a speed control signal to the DC fan to achieve speed control. The speed regulation signal can be a pulse width modulation signal, a Vsp signal, an adjustable resistor, a temperature control resistor, and the like. This speed adjustment is up to date.
Comparison of advantages and disadvantages of two speed control modes:
1.Advantages of terminal voltage speed regulation: simple circuit, only need to change terminal voltage to achieve speed regulation, good speed regulation performance, low cost
2. Disadvantages of terminal voltage speed regulation: The speed regulation range is limited. The terminal voltage adjustment range must ensure the normal operating range of the DC fan (generally within 50% of the rated value). In many situations where a wide speed range is required, this method cannot meet the speed requirements.
3. The advantage of the invention is that the speed adjustment range is wide, and the speed adjustment of the DC fan from 0 to the highest speed range can be basically realized, and the normal operation of the DC fan will not be affected at the lowest speed.
4. Disadvantages of the logic control speed regulation method of the DC fan: the circuit structure is complicated and the cost is high. Generally, the interface circuit will be designed integrally with the client circuit.
Fourth, DC fan internal logic control speed control signal type: Speed control signal input mainly includes pulse width modulation signal, voltage source voltage (VSP) speed control signal, adjustable resistance, temperature control resistance and other inputs. The specific type of input signal to be selected depends on the signal the customer control system can give.
Shenzhen Jiangshanlai Electronics Technology Co., Ltd. was established in 2005. Located in Shenzhen, China, is a professional manufacturer of DC brushless motors, DC cooling fans, DC brushless fans, DC bracket fans, booster cooling fans, mini cooling fans, DC cooling fans, DC fans, non-standard fans, R & D and manufacturing , Sales, and service.