Xiaobian think,
DC FanThere are currently two ways to adjust the speed of the external voltage of the fan and the internal logic control circuit of the DC fan. These two speed control methods have advantages and disadvantages, summarized as follows:
Voltage regulation 1. the external end of the DC fan: This type of speed regulation was widely used in the earliest speed regulation schemes. The main reason that speed regulation can be achieved is that the DC fan has a wide range of voltage adaptability. It is very wide and can work normally at 50% of the rated voltage, and the terminal voltage determines the speed. Therefore, most early speed adjustments are made in this way. At the same time, this speed control method is simple and low cost.
The internal logic control circuit of the 2. DC fan is used for speed regulation: add a speed regulation signal to the DC fan to realize speed regulation. The speed control signal can be a PWM signal, a Vsp signal, an adjustable resistor, a temperature control resistor, etc. This speed control method is the latest speed control method.
The advantages and disadvantages of the 3. two speed adjustment methods are compared:
1. Advantages of terminal voltage speed regulation method: simple circuit, only need to change the terminal voltage to achieve speed regulation, good speed regulation performance and low cost
2. Disadvantages of terminal voltage speed regulation: speed regulation range is limited. The terminal voltage adjustment range must ensure that the DC fan can operate normally (usually within 50% of the rated value). This method can not meet the requirements of speed regulation.
3. The internal logic speed regulation method of the DC fan has the advantage of wide speed regulation range, the speed can be adjusted from 0 to the maximum speed of the DC fan, and the normal operation of the DC fan is not affected at the minimum speed.
4. Disadvantages of internal logic speed regulation of DC fan: complex circuit structure and high cost. Typically, the interface circuit is designed integrally with the customer circuit.
4. DC fan internal logic control speed control signal type: speed control signal input mainly includes PWM signal, VSP (analog signal) speed control signal, adjustable resistance, temperature control resistance and other inputs. Which input signal is specifically selected is determined by the signals that can be given by the customer control system.
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