Frequency-adjusting and speed-adjusting interface circuit, fan and fan speed adjusting system and method

Abstract

The embodiment of the invention discloses a frequency-adjusting and speed-adjusting interface circuit, a fan and a fan speed adjusting system and method. The frequency-adjusting and speed-adjusting interface circuit is connected between a user input device and a micro-control unit. The user input device inputs a speed adjusting numerical value to the micro-control unit through the frequency-adjusting and speed-adjusting interface circuit. The frequency-adjusting and speed-adjusting interface circuit comprises interfaces and a pull-up resistor. The interfaces comprise the input interface connected with the user input device and the output interface connected with the micro-control unit. One end of the pull-up resistor is connected with the input interface and a circuit power source, the other end of the pull-up resistor is connected with the output interface so that a pulse signal from the user input device can be transmitted to the micro-control unit from the output interface, and thusthe micro-control unit performs matching of the corresponding speed adjusting numerical value according to the frequency of the pulse signal to adjust the rotation speed of the fan. By means of the frequency-adjusting and speed-adjusting interface circuit, the influence of temperature can be avoided, high-precision fan speed adjustment is achieved, and the effect that the output speed of the fanmeets the target speed required by users is ensured.

Description

technical field [0001] The embodiments of the present invention relate to the field of electrical technology, and in particular to a frequency modulation speed regulation interface circuit, a fan, a fan speed regulation system and a speed regulation method. Background technique [0002] As we all know, some production processes need to be carried out under certain wind pressure and air volume, so fan equipment is widely used in dust removal, ventilation, blasting and other aspects. The fan mainly realizes the function of ventilation and blowing through the operation of the impeller driven by the motor. [0003] So far, the speed control interface circuit is an essential and important part in the fan application industry. In the prior art, the general-purpose speed regulation interface circuit is generally a voltage regulation speed regulation interface circuit and a duty cycle speed regulation interface circuit. The micro control unit inside the fan adjusts the speed by det...

AI Technical Summary

Problems solved by technology

However, the above general speed control methods all have the defect that they cannot meet the user's high precision requirements for speed control, and the general speed control methods are generally isolated by digital optocouplers. When the temperature changes, the digital optocoupler in the speed control interface circuit The rising and falling edges of the coupling will change, resulting in different speeds for the same input value of the user at different temperatures, which will eventually affect the output speed of the fan and the user's target speed.

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