CN-224214419-U - Intelligent fan rotating speed adjusting circuit

Abstract

The utility model relates to the technical field of fan rotation speed regulation, in particular to an intelligent fan rotation speed regulation circuit. The circuit comprises a thermistor, an operational amplifier integrated circuit, a pulse width modulation integrated circuit and a fan driving circuit, wherein the temperature is acquired through the thermistor and is converted into a voltage signal, the voltage signal is input into the operational amplifier integrated circuit for amplification, the operational amplifier integrated circuit comprises four operational amplifiers, the amplified voltage signal is subjected to the pulse width modulation integrated circuit to output a PWM pulse width modulation signal, and the fan driving circuit controls the fan rotating speed according to the PWM pulse width modulation signal. The temperature of the hot spot area is monitored in real time through the circuit, and the rotating speed of the fan is automatically adjusted according to the dynamic change of the temperature, so that the temperature in the cold pool is kept uniform and stable.

Inventors

• YANG YIMENG
• YANG YANG
• LI YANZHE

Assignees

• 兰州交通大学

Dates

Publication Date

20260508

Application Date

20250625

Claims (5)

1. 1. An intelligent fan rotating speed regulating circuit is characterized by comprising a thermistor, an operational amplifier integrated circuit, a pulse width modulation integrated circuit and a fan driving circuit; The temperature of the thermistor is collected and converted into a voltage signal, the voltage signal is input into the operational amplifier integrated circuit for amplification, the operational amplifier integrated circuit comprises four operational amplifiers, the amplified voltage signal passes through the pulse width modulation integrated circuit to output a PWM pulse width modulation signal, and the fan driving circuit controls the fan rotating speed according to the PWM pulse width modulation signal.
2. 2. The intelligent fan speed adjusting circuit according to claim 1, wherein the operational amplifier integrated circuit comprises a first operational amplifier, a second operational amplifier, a third operational amplifier and a fourth operational amplifier, wherein the first operational amplifier and the third operational amplifier form a differential amplifying circuit, and the first operational amplifier and the fourth operational amplifier form an in-phase proportional operational amplifying circuit respectively.
3. 3. The intelligent fan speed regulator circuit of claim 1, wherein the pulse width modulation integrated circuit is a KA7500B control chip.
4. 4. The intelligent fan speed adjusting circuit according to claim 1, wherein the fan driving circuit comprises a push-pull circuit composed of triodes Q1 and Q2, a Schottky diode D, resistors R11 and R12 and a field effect transistor Q3, wherein the drain electrode of the field effect transistor Q3 is connected with a direct current fan, the source electrode is grounded, and the grid electrode is connected with a PWM pulse width modulation signal output by the push-pull circuit.
5. 5. The intelligent fan speed adjustment circuit of claim 1, further comprising a potentiometer VR for adjusting a reference voltage of the operational amplifier integrated circuit.

Description

Intelligent fan rotating speed adjusting circuit Technical Field The utility model relates to the technical field of fan rotation speed regulation, in particular to an intelligent fan rotation speed regulation circuit. Background At present, an air flow organization form of underfloor air supply and air return on a suspended ceiling is commonly adopted in a data center, a row of back-to-back and face-to-face arrangement is adopted in a cabinet, a ventilation floor is arranged in the middle of a front facing channel of two rows of cabinets to form a cold air area cold channel, so that energy is saved, consumption is reduced, the use efficiency of cold air is improved, a cold pool is generally formed by sealing the cold channel, cold air in the cold pool only flows through IT equipment, the formed hot air is discharged into a hot channel in the back of the two rows of cabinets, and the hot air returns to an air conditioning system through the hot channel and the suspended ceiling, thus, the cold air and the hot air are completely isolated, refrigeration short circuit and repeated refrigeration are prevented, the air flow of the whole data center is smooth, the utilization rate and the refrigeration efficiency of the precision air conditioner of the data center are improved, and the energy saving effect is achieved. However, some cold ponds are far away from an air conditioner, air supply under the floor is unsmooth, the air supply amount is low, the internal installation equipment is more, the power consumption is high, and the like, so that the temperature difference of the upper part and the lower part of an internal cabinet of the cold pond is caused, local hot spots exist, the normal operation of IT equipment in the area is affected, and an apparatus circuit for realizing automatic air supply and cooling and regulating and controlling the internal temperature of the cold pond through intelligent control is needed. Disclosure of utility model In order to solve the problems in the prior art, the utility model provides an intelligent fan rotating speed regulating circuit. The circuit comprises a thermistor, an operational amplifier integrated circuit, a pulse width modulation integrated circuit and a fan driving circuit, wherein the temperature is acquired through the thermistor and is converted into a voltage signal, the voltage signal is input into the operational amplifier integrated circuit for amplification, the operational amplifier integrated circuit comprises four operational amplifiers, the amplified voltage signal is subjected to the pulse width modulation integrated circuit to output a PWM pulse width modulation signal, and the fan driving circuit controls the rotating speed of a fan according to the PWM pulse width modulation signal. The temperature of the hot spot area is monitored in real time through the circuit, and the rotating speed of the fan is automatically adjusted according to the dynamic change of the temperature, so that the temperature in the cold pool is kept uniform and stable. The utility model adopts the following technical scheme that the intelligent fan rotating speed regulating circuit comprises a thermistor, an operational amplifier integrated circuit, a pulse width modulation integrated circuit and a fan driving circuit; The temperature of the thermistor is collected and converted into a voltage signal, the voltage signal is input into the operational amplifier integrated circuit for amplification, the operational amplifier integrated circuit comprises four operational amplifiers, the amplified voltage signal passes through the pulse width modulation integrated circuit to output a PWM pulse width modulation signal, and the fan driving circuit controls the fan rotating speed according to the PWM pulse width modulation signal. Further, the operational amplifier integrated circuit comprises a first operational amplifier, a second operational amplifier, a third operational amplifier and a fourth operational amplifier, wherein the first operational amplifier and the third operational amplifier form a differential amplifying circuit, and the first operational amplifier and the fourth operational amplifier respectively form an in-phase proportional operational amplifying circuit. Furthermore, the pulse width modulation integrated circuit adopts a KA7500B control chip. Further, the fan driving circuit comprises a push-pull circuit formed by triodes Q1 and Q2, a Schottky diode D, resistors R11 and R12 and a field effect transistor Q3, wherein the drain electrode of the field effect transistor Q3 is connected with a direct current fan, the source electrode is grounded, and the grid electrode is connected with a PWM pulse width modulation signal output by the push-pull circuit. Further, the fan rotating speed regulating circuit further comprises a potentiometer VR used for regulating the reference voltage of the operational amplifier integrated circuit. The intelligent temperature con