A system and method for setting fan start-up power

Abstract

The present invention relates to the field of fan control technology, and in particular to a system capable of setting the power of fan startup, which has active and passive ways of adjusting the fan speed. During active adjustment, a user can send a power signal of the required fan rotation to a main control module through an active adjustment module, and the main control module enables the fan control module to output the corresponding power according to the received power signal, and then controls the fan to operate at a target speed, thereby meeting different heat dissipation requirements of users and allowing flexible adjustment. During passive adjustment, a power detection module detects voltage and current signals of several ports, and transmits the detected signals to the main control module, and the main control module determines the power of all ports, and adjusts the output power of the fan control module according to the power conditions of the ports, so that the operating power of the fan matches the power of the port, and the fan does not need to operate at full speed for a long time, thus avoiding resource consumption, while protecting the fan.

Description

Technical Field

[0001] The present invention relates to the technical field of fan control, and in particular to a system capable of setting the start-up power of a fan. Background Art

[0002] With the development of network communication technology and the widespread popularity of IoT applications, the demand for Power over Ethernet (PoE) technology is growing in the market due to its advantages of simplifying wiring and providing power transmission. As a key device, the power supply capacity of the PoE port of the PoE switch is directly related to the normal operation of the connected devices. However, as the PoE power increases, the heat dissipation requirements for the power module and the overall system also increase.

[0003] In the prior art, in order to ensure the stable operation of the PoE switch under high load conditions, a built-in fan is usually used for active heat dissipation. Although this method can solve the overheating problem to a certain extent, the fan usually runs at a constant speed regardless of the actual load conditions. This uncontrollable fan system has obvious defects, especially when the PoE switch is not working at full load, the fan running at full speed not only consumes unnecessary energy, but also generates high noise, affecting the user experience; in addition, the fan running at high speed continuously will accelerate wear, shorten its service life, and increase maintenance costs. Of course, there are also stepless speed regulating electric fans such as those disclosed in patent 201120278597.8, which can achieve fan speed regulation, but cannot be adjusted accordingly according to the power conditions of the port, and are difficult to control. Summary of the invention

[0004] The present invention provides a system capable of setting the fan startup power in view of the problems in the prior art. The fan control module can output different output powers and control the fan to change the rotation speed according to the power of the port to adapt to the heat dissipation demand.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a system capable of setting the fan start-up power, comprising a main control module, an active adjustment module, a power detection module and a fan control module;

[0006] The main control module is connected to the control end of the fan control module;

[0007] The active adjustment module is used to send a fan power signal to the main control module, and the main control module controls the output power of the fan control module according to the received fan power signal;

[0008] The power detection module is used to detect the working voltage and current signals of the POE port, and transmit the detection results to the main control module, and the main control module controls the output power of the fan control module according to the detected voltage and current signals of the POE port;

[0009] The output end of the fan control module is connected to the control end of the external fan, and the fan is made to work at different powers by outputting different control signals.

[0010] Preferably, the fan control module includes a normally open drive unit and several fixed power drive units, the normally open drive unit is used to control the fan to operate at 100% power; the several fixed power drive units are used to control the fan to operate at different powers, and the different powers are lower than 100%.

[0011] Preferably, the normally open driving unit includes a switch tube Q1, a switch tube Q2, a switch tube Q9 and a resistor R1;

[0012] The control end of the switch tube Q2 is connected to an output end of the main control module, the control end of the switch tube Q9 is connected to the other output end of the main control module, the control end of the switch tube Q1 is connected to a switch end of the switch tube Q2, the other open end of the switch tube Q2 is grounded, a switch end of the switch tube Q1 is connected to a switch end of the switch tube Q9, the other switch end of the switch tube Q1 is connected to an external power supply, the other switch end of the switch tube Q9 is connected to a fan, and the two ends of the resistor R1 are respectively connected to the control end and the other switch end of the switch tube Q1.

[0013] Preferably, the fixed power driving unit includes a switch tube Q7, a switch tube Q8, a switch tube Q10, a resistor R6, a diode D4 and a resistor R8;

[0014] The control end of the switch tube Q8 is connected to an output end of the main control module, the control end of the switch tube Q10 is connected to another output end of the main control module, the control end of the switch tube Q7 is connected to a switch end of the switch tube Q8, the other open end of the switch tube Q8 is grounded, a switch end of the switch tube Q7 is connected to the cathode of the diode D4 through a switch end of the switch tube Q10, the anode of the diode D4 is grounded, the resistor R8 is connected in parallel with the diode D4, the other switch end of the switch tube Q7 is connected to an external power supply, the other switch end of the switch tube Q10 is connected to a fan, and the two ends of the resistor R6 are respectively connected to the control end and the other switch end of the switch tube Q7;

[0015] The voltage drop of the diode D4 of different fixed power driving units is different.

[0016] Preferably, the power detection module includes a detection controller, which is connected to multiple external ports and is used to detect voltage and current signals of the ports. The detection controller transmits the detected voltage and current signals to the main control module, and the main control module is used to control the output power of the fan control module according to the power of the external port.

[0017] The present invention also discloses a method based on setting the fan start-up power, including a method for actively setting the fan start-up power:

[0018] Input the fan power control command through the active adjustment module;

[0019] The main control module receives the control command of the active adjustment module, and sets the output power of the fan control module according to the control command, so that the fan operates according to the output power of the fan control module.

[0020] Preferably, the method further includes passively setting the fan start power:

[0021] After the detection controller detects the power of multiple external ports, the main control module receives the detection power data of the detection controller and calculates the sum of the data of each port;

[0022] The main control module sets the output power of the fan control module according to the calculated sum of the data of each port, so that the fan operates according to the output power of the fan control module.

[0023] Preferably, the fan control module is provided with a plurality of power levels for starting the fan, and each power level is provided with a different power range;

[0024] The main control module receives and compares the calculated port power with several power levels of the fan control module to determine within which power level the port power is located;

[0025] The main control module controls the fan control module to output corresponding power according to the comparison result.

[0026] Preferably, the detection controller detects the real-time power of the port.

[0027] Beneficial effects of the present invention:

[0028] The present invention provides a system capable of setting fan startup power, which has active and passive ways of adjusting the fan speed. During active adjustment, the user can send a power signal of the required fan rotation to the main control module through the active adjustment module, and the main control module enables the fan control module to output the corresponding power according to the received power signal, and then controls the fan to operate at the target speed, thereby meeting the different heat dissipation requirements of the user and allowing flexible adjustment. During passive adjustment, the voltage and current signals of several ports are detected through the power detection module, and the detected signals are transmitted to the main control module, and the main control module determines the power of all ports and adjusts the output power of the fan control module according to the power conditions of the ports, so that the operating power of the fan matches the power of the port, the fan does not need to operate at full speed for a long time, thus avoiding resource consumption, and at the same time protecting the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a signal block diagram of the present invention;

[0030] Figure 2 is a circuit schematic diagram of the main control module of the present invention;

[0031] Figure 3 is a circuit schematic diagram of the fan adjustment module of the present invention;

[0032] Figure 4 A flow chart of a method for passively setting fan start-up power according to the present invention;

[0033] exist Figures 1 to 4 Reference numerals in the drawings include:

[0034] 1- Main control module, 2- Active adjustment module, 3- Power detection module, 4- Fan control module, 5- Normally open drive unit, 6- Fixed power drive unit. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings. The contents mentioned in the embodiments are not limitations of the present invention. The present invention is described in detail below in conjunction with the drawings. Example 1:

[0036] This embodiment provides a system for setting the fan start power, such as Figures 1 to 3 , including a main control module 1, an active adjustment module 2, a power detection module 3 and a fan control module 4;

[0037] The main control module 1 is connected to the control end of the fan control module 4; the active adjustment module 2 is used to send a fan power signal to the main control module 1, and the main control module 1 controls the output power of the fan control module 4 according to the received fan power signal;

[0038] The power detection module 3 is used to detect the working voltage and current signals of the POE port, and transmit the detection results to the main control module 1. The main control module 1 controls the output power of the fan control module 4 according to the detected voltage and current signals of the POE port;

[0039] The output end of the fan control module 4 is connected to the control end of the external fan, and enables the fan to work at different powers by outputting different control signals.

[0040] Specifically, Figures 1 to 3 As shown, the active adjustment module 2 of this embodiment can be a control screen, a touch screen, etc., and communicates with the main control module 1 through I2C. The active adjustment module 2 is provided with multiple power options. For example, the total POE power is set to 120W, and the power levels of the fan start-up are set to 20%, 40%, 60%, and 100%. Therefore, when the active adjustment module 2 selects the corresponding power level, the active adjustment module 2 transmits the control signal of the corresponding power level to the main control module 1. After the main control module 1 receives the control signal, it adjusts the fan control module 4 to output the corresponding power signal according to the power level of the control signal. The fan then works according to the output power signal of the fan control module 4 to adjust the fan speed. When the fan's operating speed is adjusted in real time by the power detection module 3, as shown in FIG. Figure 1 The system is connected with several POE ports, and the several POE ports are all connected with the power detection module 3. The power detection module 3 detects the voltage and current signals of each POE port, and transmits the detected signals to the main control module 1. The main control module 1 converts the voltage and current signals of each POE port into the power of the port, analyzes and calculates the power sum of all ports, and then compares the power sum of all ports with the power level of the fan operation, and determines within which power level of the fan the current port power is located. The main control module 1 then adjusts the output power of the fan control module 4 to make the fan operate at this power level. Therefore, the fan of this embodiment can cooperate with the working conditions of the port, adjust the operating speed in real time, prevent damage to the fan caused by long-term full-speed operation, and can reduce resource consumption, work and maintenance costs.

[0041] The main control module 1 of this embodiment is as follows Figure 2 As shown, the main control module 1 includes a controller and a peripheral circuit of the controller, wherein the controller is a prior art, such as a single chip microcomputer, etc. The peripheral circuit includes a diode D3 of PIN6 of the controller U1, a current limiting resistor from PIN17 to PIN24, that is, a resistor R14 to a resistor R21, and the specific connection method is as follows Figure 2 shown.

[0042] The power detection module 3 of this embodiment includes a detection controller, such as Figure 1As shown, the detection controller is connected to multiple external ports and is used to detect the voltage and current signals of the ports. The detection controller transmits the detected voltage and current signals to the main control module 1, and the main control module 1 is used to control the output power of the fan control module 4 according to the power of the external port. The detection controller of this embodiment is preferably a PSE chip, which detects the voltage and current signals of all connected POE ports through the PSE chip, and then transmits the detected voltage and current signals to the main control module 1 through I2C. The main control module 1 calculates and analyzes the power of all connected poe ports, and then the main control module 1 controls the working power of the fan according to the sum of the real-time power of all poe ports, so that the working power of the fan can adapt to the power of the port.

[0043] The fan control module 4 of this embodiment is as follows Figure 3 As shown, it includes a normally open drive unit 5 and a plurality of fixed power drive units 6. The normally open drive unit 5 is used to control the fan to operate at 100% power; the plurality of fixed power drive units 6 are used to control the fan to operate at different powers, and the different powers are powers lower than 100%. Among them, the normally open drive unit 5 includes a switch tube Q1, a switch tube Q2, a switch tube Q9 and a resistor R1; the control end of the switch tube Q2 is connected to an output end of the main control module 1, the control end of the switch tube Q9 is connected to another output end of the main control module 1, the control end of the switch tube Q1 is connected to a switch end of the switch tube Q2, the other open end of the switch tube Q2 is grounded, a switch end of the switch tube Q1 is connected to a switch end of the switch tube Q9, the other switch end of the switch tube Q1 is connected to an external power supply, the other switch end of the switch tube Q9 is connected to the fan, and the two ends of the resistor R1 are respectively connected to the control end and the other switch end of the switch tube Q1. The fixed power drive unit 6 includes a switch tube Q7, a switch tube Q8, a switch tube Q10, a resistor R6, a diode D4 and a resistor R8; the control end of the switch tube Q8 is connected to an output end of the main control module 1, the control end of the switch tube Q10 is connected to another output end of the main control module 1, the control end of the switch tube Q7 is connected to a switch end of the switch tube Q8, the other open end of the switch tube Q8 is grounded, a switch end of the switch tube Q7 is connected to the cathode of the diode D4 through a switch end of the switch tube Q10, the anode of the diode D4 is grounded, the resistor R8 is connected in parallel with the diode D4, the other switch end of the switch tube Q7 is connected to an external power supply, the other switch end of the switch tube Q10 is connected to a fan, and the two ends of the resistor R6 are respectively connected to the control end and the other switch end of the switch tube Q7; in particular, the voltage drop of the diode D4 of different fixed power drive units 6 is different. The specific circuit connection method is as follows: Figure 3 shown.

[0044] The specific working principle of the fan control module 4 is as follows:

[0045] The following is the fan active power control part, such as Figures 1 to 3 As shown, the main control module 1 needs 8 I / O ports to control the fan to turn on. Every 2 I / Os are responsible for controlling a fixed power drive unit 6 or a normally open drive unit 5 of the fan control module 4. The two control signals of the 2 I / Os must meet the conditions of one low and one high. When the fan is turned on, the gate voltage of the PMOS tube must be low, and the base voltage of the transistor that controls the fan power supply must be high, which corresponds to the fan being turned on at 20% power, 40% power, 60% power and normally open (100%). Each fixed power drive unit 6 contains a PMO S controls the on and off of the 12V power supply, a bias resistor provides a bias voltage to the PMOS gate, a voltage regulator controls the voltage of each fan power control, and two NPN transistors, one NPN transistor controls the on and off of the PMOS gate, and one NPN transistor is used to isolate the four-way fan control circuit (to prevent interference and misoperation). The main difference between the normally open drive unit 5 and the fixed power drive unit 6 is that the normally open drive unit 5 does not include a voltage regulator. The principles of the normally open drive unit 5 and the fixed power drive unit 6 are basically the same. The following uses the fan turned on at 20% power to illustrate:

[0046] 1. Set the power of the fan on the active adjustment module 2;

[0047] 2. Active adjustment module 2 needs to load firmware to communicate with main control module 1 through I2C interface. When we select to turn on the fan at 20% power on active adjustment module 2, active adjustment module 2 will transmit the command to main control module 1 through I2C signal bus. Main control module 1 will make corresponding actions to control fan control module 4 according to the information sent by active adjustment module 2 (the fan is turned on at 20% power);

[0048] 3. After the main control module 1 receives the information (the fan is turned on at 20% power), Figure 2 and Figure 3 , the levels of pins 21 and 22 of the I / O port of the main control module 1 will be adjusted according to the settings (the main control module 1 I / O port that controls the fan to turn on at 20% power); the switch tube Q8 is used to control the gate voltage of the PMOS. When the base of the switch tube Q8 is pulled low (the initial state defaults to a high level), the switch tube Q8 is turned off. At this time, the resistor R6 connected in parallel with the gate of the PMOS, i.e., the switch tube Q7, provides a bias voltage to the gate of the switch tube Q7, turning on the switch tube Q7. The collector of the switch tube Q10 is connected in parallel with the resistor R8 and the 3.3V voltage regulator D4. When the switch tube Q7 is turned on, the voltage regulator D4 stabilizes the collector voltage of the switch tube Q10 at 3.3V;

[0049] 4. At this time, the base of the switch tube Q10 (the default low level in the initial state) is driven to open by the main control module 1. Because the collector voltage of the switch tube Q10 is 3.3V, the base voltage is driven by the main control module 1. The power supply voltage of the main control module 1 passes through the diode D3, so the base drive voltage of the switch tube Q10 is less than 3.3V, and Uc of the switch tube Q10 is greater than Ub. At this time, the switch tube Q10 is in a saturated state. No matter how the collector voltage changes, the current flowing through the switch tube Q10 will not change. The fan can be regarded as an equivalent resistor. Since the fan current will not change, the voltage is stabilized at 3.3V by the voltage regulator tube. Because P=U*I, when the voltage and current do not change, the fan runs at a fixed power of 20%;

[0050] The fan operates at 40%, 60% and 20% power in the same way, except that the voltage regulator tube controlling the positive pole of the fan input is different, and the rest is the same. When the fan is normally on (100%), the voltage regulator tube is not needed, and 12V is directly supplied to the fan (the rated voltage of the fan is 12V);

[0051] In addition, the fan selection must be one with a starting voltage greater than or equal to 3.3V, otherwise the fan cannot start when the voltage is 3.3V.

[0052] In this embodiment, the fan power-grading start-up function can be realized, and the fan start-up power can be set according to the actual environmental requirements. The power of the PoE port can also be detected in real time, and the fan power can be adjusted according to the power situation of the PoE port. The function of setting the power-grading start-up fan in this embodiment can be used in environments and scenarios where fans are needed. For example, in a cold environment or a scenario with low PoE output, the fan start-up power can be increased or even set to an off state. In a hot environment or a scenario with high PoE output power, the fan can be set to be always on (100%). In a normal environment, the power can also be adjusted to the power start-up function that requires the use of fan heat dissipation, thereby reducing the noise interference caused by the fan and reducing the energy loss caused by the fan to the switch.

[0053] Embodiment 2:

[0054] This embodiment discloses a method for setting the power of a fan, including an active method for setting the power of a fan and a passive method for setting the power of a fan.

[0055] Among them, the active methods include:

[0056] A1. Input a control command for turning on the fan power through the active adjustment module 2; wherein the active adjustment module 2 may be a display screen, a control screen or a control button, etc., and the control method is the existing technology;

[0057] A2, the main control module 1 receives the control command of the active adjustment module 2, and sets the output power of the fan control module 4 according to the control command, so that the fan operates according to the output power of the fan control module 4; if the control command of the corresponding working power is input through the control panel, the main control module 1 receives the control command, and adjusts the fan control module 4 to output the corresponding power according to the control command;

[0058] Including passive methods of setting fan power, such as Figure 4 , including the following steps:

[0059] B1. After the detection controller detects the power of multiple external ports, the main control module 1 receives the detection power data of the detection controller and calculates the sum of the data of each port;

[0060] B2. The main control module 1 sets the output power of the fan control module 4 according to the calculated sum of the data of each port, so that the fan operates according to the output power of the fan control module 4;

[0061] Among them, the fan control module 4 is set with several power levels for turning on the fan, and each power level is set with a different power range; the main control module 1 accepts and compares the calculated port power with several power levels of the fan control module 4 to determine which power level's power range the port power is within; the main control module 1 controls the fan control module 4 to output the corresponding power based on the comparison result. Specifically, the passive start is mainly that the main control module 1 reads all the PoE port information collected by the power detection module 3, calculates the total power of all ports, and then compares the total power of the port with the set value, and turns on the corresponding fan control circuit according to the comparison result, such as: the POE total power is set to 120W, and the set fan start power level is 0-20% for 24W, 20%-40% for 48W, 40%-60% for 72W, 60%-100% for 120W. When the real-time port total power obtained by the main control module 1 is 45W, 45W is greater than 24W and less than 72W, which meets the condition that the fan is turned on at 40%, then the main control module 1 will turn on 40% of the fan power through the fan control module 4 to dissipate heat for the switch. The fan start power can be matched with the POE port power, such as 20% of the POE port power corresponds to the fan turning on 20% power operation, 40% of the POE port power corresponds to the fan turning on 40% power operation, etc., which can be adjusted according to actual application conditions.

[0062] The fan startup power setting method of the present embodiment is that, first, the user can actively select the fan startup power through the active adjustment module 2, such as the control screen, to control the fan to run at a speed that adapts to the environment; second, the power detection module 3 can be coordinated with the main control module 1 to adjust the fan's rotation power in real time according to the power situation of the port, thereby meeting the heat dissipation requirements under different environmental conditions, which is more practical.

[0063] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention, which do not depart from the content of the technical solution of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. A system capable of setting fan power, characterized in that: It includes a main control module, an active adjustment module, a power detection module and a fan control module; The main control module is connected to the control end of the fan control module; The active adjustment module is used to send a fan power signal to the main control module, and the main control module controls the output power of the fan control module according to the received fan power signal; The power detection module is used to detect the working voltage and current signals of the POE port, and transmit the detection results to the main control module, and the main control module controls the output power of the fan control module according to the detected working voltage and current signals of the POE port; The output end of the fan control module is connected to the control end of the external fan, and the fan is made to work at different powers by outputting different control signals; The fan control module includes a normally open drive unit and a plurality of fixed power drive units, wherein the normally open drive unit is used to control the fan to operate at 100% power; and the plurality of fixed power drive units are used to control the fan to operate at different powers, wherein the different powers are powers lower than 100%; The normally open driving unit includes a switch tube Q1, a switch tube Q2, a switch tube Q9 and a resistor R1; The control end of the switch tube Q2 is connected to an output end of the main control module, the control end of the switch tube Q9 is connected to another output end of the main control module, the control end of the switch tube Q1 is connected to a switch end of the switch tube Q2, the other switch end of the switch tube Q2 is grounded, a switch end of the switch tube Q1 is connected to a switch end of the switch tube Q9, the other switch end of the switch tube Q1 is connected to an external power supply, the other switch end of the switch tube Q9 is connected to a fan, and two ends of the resistor R1 are respectively connected to the control end and the other switch end of the switch tube Q1; The fixed power driving unit includes a switch tube Q7, a switch tube Q8, a switch tube Q10, a resistor R6, a diode D4 and a resistor R8; The control end of the switch tube Q8 is connected to an output end of the main control module, the control end of the switch tube Q10 is connected to another output end of the main control module, the control end of the switch tube Q7 is connected to a switch end of the switch tube Q8, the other switch end of the switch tube Q8 is grounded, a switch end of the switch tube Q7 is respectively connected to a switch end of the switch tube Q10 and the cathode of the diode D4, the anode of the diode D4 is grounded, the resistor R8 is connected in parallel with the diode D4, the other switch end of the switch tube Q7 is connected to an external power supply, the other switch end of the switch tube Q10 is connected to a fan, and the two ends of the resistor R6 are respectively connected to the control end and the other switch end of the switch tube Q7; The voltage drop of the diode D4 of different fixed power driving units is different.

2. A system capable of setting fan start-up power according to claim 1, characterized in that: The power detection module includes a detection controller, which is connected to multiple external ports and is used to detect voltage and current signals of the ports. The detection controller transmits the detected voltage and current signals to the main control module, and the main control module is used to control the output power of the fan control module according to the power of the external port.

3. A method for setting the fan start power, characterized in that: The system capable of setting the fan start-up power as claimed in claim 1 includes a method for actively setting the fan start-up power: Input the fan power control command through the active adjustment module; The main control module receives the control command of the active adjustment module, and sets the output power of the fan control module according to the control command, so that the fan operates according to the output power of the fan control module.

4. A method for setting fan start-up power according to claim 3, characterized in that: It also includes a method for passively setting the fan power: After the detection controller detects the power of multiple external ports, the main control module receives the detection power data of the detection controller and calculates the sum of the data of each port; The main control module sets the output power of the fan control module according to the calculated sum of the data of each port, so that the fan operates according to the output power of the fan control module.

5. A method for setting fan start-up power according to claim 4, characterized in that: The fan control module is provided with a plurality of power levels for starting the fan, and each power level is provided with a different power range; The main control module receives and compares the calculated port power with several power levels of the fan control module to determine within which power level the port power is located; The main control module controls the fan control module to output corresponding power according to the comparison result.

6. A method for setting fan start-up power according to claim 4, characterized in that: The detection controller detects the real-time power of the port.

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