CN114837980A - Fan control circuit, fan and electronic equipment - Google Patents
Fan control circuit, fan and electronic equipment Download PDFInfo
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- CN114837980A CN114837980A CN202210530703.XA CN202210530703A CN114837980A CN 114837980 A CN114837980 A CN 114837980A CN 202210530703 A CN202210530703 A CN 202210530703A CN 114837980 A CN114837980 A CN 114837980A
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- 239000003990 capacitor Substances 0.000 claims description 36
- 238000010586 diagram Methods 0.000 description 12
- 230000007958 sleep Effects 0.000 description 6
- 230000001629 suppression Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 208000013738 Sleep Initiation and Maintenance disease Diseases 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006266 hibernation Effects 0.000 description 1
- 206010022437 insomnia Diseases 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention relates to a fan control circuit, a fan and electronic equipment, wherein the fan control circuit comprises a first switch circuit and a second switch circuit, wherein when the electronic equipment is in a standby or shutdown condition, a state signal of the electronic equipment is a low level signal, the low level signal acts on a control end of the first switch circuit to enable the control end to be in a cut-off state, the second switch circuit is further controlled to be in the cut-off state, the connection between a first direct current power supply and a power supply circuit of the fan is disconnected, and the fan cannot rotate due to power failure. Therefore, when the electronic equipment is in a standby state or is shut down, the fan control circuit can cut off the power supply of the fan to stop rotating, so that the control failure of the fan is prevented, and the fan can be controlled more accurately.
Description
Technical Field
The present invention relates to the field of fan control, and in particular, to a fan control circuit, a fan, and an electronic device.
Background
Electronic equipment produces certain heat easily in the course of the work, needs to use the fan to dispel the heat to it. The driving signal of the fan is a PWM signal, and under normal conditions, the electronic device outputs the PWM signal through an Embedded Controller (EC) inside to control the rotation of the fan. However, when the electronic device is in a shutdown, sleep or sleep state and the power supply of the fan is always on, the fan may rotate all the time and be uncontrolled, i.e. the problem of failure of fan control occurs.
Disclosure of Invention
The embodiment of the invention aims to provide a fan control circuit, a fan and electronic equipment, which can control the fan more accurately and prevent control failure of the fan under the condition that the electronic equipment is in a standby state or is shut down.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:
in a first aspect, an embodiment of the present invention provides a fan control circuit, which is applied to a fan,
the fan is used for dispelling the heat to electronic equipment, fan control circuit includes: a first switching circuit and a second switching circuit;
the control end of the first switch circuit is used for accessing a state signal of the electronic device, the first end of the first switch circuit is connected with the control end of the second switch circuit, the second end of the first switch circuit is grounded, the third end of the first switch circuit is respectively connected with the first end of the second switch circuit and a first direct current power supply, and the first switch circuit is used for controlling the working state of the second switch circuit;
the second end of the second switch circuit is connected with the power supply circuit of the fan, and the second switch circuit is used for controlling the connection state of the first direct-current power supply and the power supply circuit of the fan.
In some embodiments, the first switching circuit comprises a first switching module and a voltage dividing module;
the control end of the first switch module is used for accessing the state signal, the first end of the first switch module is connected with the first end of the voltage division module, and the second end of the first switch module is grounded;
the second end of the voltage division module is connected with the control end of the second switch circuit, and the third end of the voltage division module is respectively connected with the first direct current power supply and the first end of the second switch circuit.
In some embodiments, the first switch module includes a first MOS transistor and a first resistor, the voltage dividing module includes a second resistor and a third resistor, a drain of the first MOS transistor is connected to a first end of the second resistor, a source of the first MOS transistor is grounded, a gate of the first MOS transistor is connected to one end of the first resistor, and another end of the first resistor is used for accessing the state signal;
the second end of the second resistor is connected with the control end of the second switch circuit and the first end of the third resistor respectively, and the second end of the third resistor is connected with the first direct-current power supply and the first end of the second switch circuit respectively.
In some embodiments, the second switch circuit includes a second MOS transistor, a first capacitor, and a second capacitor;
the source electrode of the second MOS tube is respectively connected with the second end of the third resistor, the first direct current power supply and one end of the first capacitor, the drain electrode of the second MOS tube is connected with the power supply circuit of the fan, the grid electrode of the second MOS tube is respectively connected with the other end of the first capacitor, one end of the second capacitor, the second end of the second resistor and the first end of the third resistor, and the other end of the second capacitor is grounded.
In some embodiments, the fan control circuit further comprises a third switching circuit and a fourth switching circuit;
the control end of the third switch circuit is used for accessing the state signal, the first end of the third switch circuit is connected with the control end of the fourth switch circuit, the second end of the third switch circuit is grounded, the third end of the third switch circuit is connected with a second direct-current power supply, and the third switch circuit is used for controlling the working state of the fourth switch circuit;
the first end of the fourth switch circuit is connected with the PWM signal end, the PWM signal end is used for accessing a PWM signal, the PWM signal is a driving signal of the fan, the second end of the fourth switch circuit is grounded, and the fourth switch circuit is used for controlling the driving of the fan by the PWM signal.
In some embodiments, the third switch circuit includes a third MOS transistor, a fourth resistor, and a fifth resistor, and the fourth switch circuit includes a fourth MOS transistor;
one end of the fourth resistor is used for accessing the state signal, the other end of the fourth resistor is connected with the grid electrode of the third MOS tube, the source electrode of the third MOS tube is grounded, and the drain electrode of the third MOS tube is respectively connected with one end of the fifth resistor and the grid electrode of the fourth MOS tube;
the other end of the fifth resistor is connected with the second direct-current power supply, the source electrode of the fourth MOS tube is grounded, and the drain electrode of the fourth MOS tube is connected with the PWM signal end.
In some embodiments, the power supply system further comprises a power supply selection circuit, one end of the power supply selection circuit is connected with the power supply of the fan, the other end of the power supply selection circuit is connected with the power supply of the fan, and the power supply selection circuit is used for selecting the corresponding adaptation circuit according to the power supply of the fan.
In some embodiments, the power selection circuit includes a sixth resistor, a seventh resistor, a first switch, and a controller;
one end of the sixth resistor and one end of the seventh resistor are connected to a power supply circuit of the fan together;
the other end of the sixth resistor is connected with the first contact of the first switch, the other end of the seventh resistor is connected with the second contact of the first switch, the control end of the first switch is connected with the controller, the public end of the first switch is connected with the power supply of the fan, and the controller is used for controlling the working state of the first switch according to the power supply of the fan.
In a second aspect, an embodiment of the present invention provides a fan, which includes the fan control circuit as described above, and the fan is used for dissipating heat of an electronic device.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes the fan as described above.
In various embodiments of the present invention, the fan control circuit includes a first switch circuit and a second switch circuit, wherein when the electronic device is in a standby state or a shutdown state, a state signal of the electronic device is a low level signal, which acts on a control terminal of the first switch circuit to be in a cut-off state, so as to control the second switch circuit to be in the cut-off state, and disconnect the first dc power supply from a power supply circuit of the fan, so that the fan cannot rotate due to power failure. Therefore, when the electronic equipment is in a standby state or is shut down, the fan control circuit can cut off the power supply of the fan to stop rotating, so that the control failure of the fan is prevented, and the fan can be controlled more accurately.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a fan control circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fan control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a fan control circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a fan control circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a fan control circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a power selection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a fan control circuit according to an embodiment of the present invention. As shown in fig. 1, the fan control circuit is applied to a fan, wherein the fan is used for dissipating heat of an electronic device. When electronic equipment during operation, inside each electronic components of electronic equipment can produce certain thermal power for electronic components's operating temperature risees, and electronic components has the highest operating temperature specification requirement usually, so, need set up in electronic equipment and be used for radiating structural component, with the realization to the heat dissipation of inside each electronic components of electronic equipment, make the work that electronic equipment can be stable for a long time.
Generally, an air outlet of electronic equipment is provided with a fan, so that the electronic equipment sucks air flow from the air inlet and blows the air flow out from the air outlet through the fan to form an air flow channel, and electronic components inside the electronic equipment are ventilated and cooled.
It should be noted that the electronic devices include, but are not limited to, computers, servers, boards, televisions, projection devices, workstations, and the like.
The driving signal of the fan is a PWM signal, and under normal conditions, the electronic device outputs the PWM signal through an Embedded Controller (EC) inside to control the rotation of the fan. When the electronic device is in a shutdown, sleep or sleep state and the power supply of the fan is always on, the internal circuit of the fan pulls up the PWM terminal to a high level, so that the PWM port always outputs a high level signal and the fan is in a state of always rotating and is not controlled.
Therefore, the embodiment of the invention provides a fan control circuit, so as to control a fan more accurately.
As shown in fig. 1, the fan control circuit 100 includes a first switch circuit 10 and a second switch circuit 20, wherein a control terminal of the first switch circuit 10 is used for receiving a status signal of the electronic device, a first terminal of the first switch circuit 10 is connected to a control terminal of the second switch circuit 20, a second terminal of the first switch circuit 10 is grounded, a third terminal of the first switch circuit 10 is connected to a first terminal of the second switch circuit 20 and a first dc power supply 200, and the first switch circuit 10 is used for controlling an operating status of the second switch circuit 20.
A second end of the second switch circuit 20 is connected to the power supply circuit 300 of the fan, the second end of the second switch circuit 20 is configured to output the power supply of the fan, and the second switch circuit 20 is configured to control a connection state of the first dc power supply 200 and the power supply circuit 300 of the fan.
The state signal of the electronic device is used for reflecting the state of the electronic device, and the state signals of different electronic devices are different. If the electronic equipment is in a normal operation state, the state signal is a high level signal, and if the electronic equipment is in a standby state such as shutdown, sleep or insomnia, the state signal is a low level signal.
When the state signal is a high level signal, the first switch circuit 10 is in an on state, and when the state signal is a low level signal, the first switch circuit 10 is in an off state. The working state of the first switch circuit 10 can control the working state of the second switch circuit 20 to control the on or off of the second switch circuit, and further control the connection state of the power supply of the fan and the power supply circuit 300 of the fan to control the rotation of the fan.
The first dc power supply 200 may be set according to needs, and may be a power supply size of the fan, such as 5V or 12V. The first dc power supply 200 may also serve as a power supply for the fan.
With reference to fig. 1, the operation of the fan control circuit 100 can be described as follows:
if the electronic device is in a shutdown, sleep or hibernation state, the state signal of the electronic device is a low level signal, the low level signal acts on the control end of the first switch circuit 10 to make it in a cut-off state, and then the control end of the second switch circuit 20 is a low level, the second switch circuit 20 is cut off, the first dc power supply 200 is disconnected from the power supply circuit 300 of the fan, and the fan has no power supply and stops rotating due to power failure;
if the electronic device is in a normal operation state, the state signal of the electronic device is a high level signal, the high level signal acts on the control end of the first switch circuit 10 to make it in a conducting state, the first dc power supply 200, the first end of the first switch circuit 10, the second end of the first switch circuit 10 and the ground form a closed loop, the first dc power supply 200 acts on the first end of the first switch circuit 10 and the control end of the second switch circuit 20, and further the control end of the second switch circuit 20 is a high level, the second switch circuit 20 is conducted, the first dc power supply 200 establishes a connection with the power supply circuit 300 of the fan through the second end of the second switch circuit 20 to normally supply power to the fan, and the fan is controlled by a PWM signal sent by the EC of the electronic device to normally rotate.
In summary, when the electronic device is in a standby state or a shutdown state, the fan control circuit 100 can cut off the power supply of the fan to stop the fan from rotating, thereby preventing the control from being disabled, and further controlling the fan more precisely.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a fan control circuit according to an embodiment of the present invention, and as shown in fig. 2, the first switch circuit 10 includes a first switch module 11 and a voltage dividing module 12. Wherein, the control end of the first switch module 11 is used for accessing the status signal, the first end of the first switch module 11 is connected to the first end of the voltage dividing module 12, the second end of the first switch module 11 is grounded, the second end of the voltage dividing module 12 is connected to the control end of the second switch circuit 20, and the third end of the voltage dividing module 12 is connected to the first dc power supply 200 and the first end of the second switch circuit 20 respectively.
When the state signal is a low level signal, the control terminal of the first switch module 11 is at a low level, the first switch module 11 is in a cut-off state, and further the second switch circuit 20 is also in a cut-off state, the first dc power supply 200 is disconnected from the power supply circuit 300 of the fan, and the fan stops rotating due to power failure, so that direct rotation of the fan is prevented, and control is disabled.
When the state signal is a high level signal, the control end of the first switch module 11 is a high level, the first switch module 11 is in a conducting state, the first dc power supply 200, the voltage dividing module 12, the first end of the first switch module 11, the second end of the first switch module 11 and the ground form a loop, the voltage dividing module 12 divides voltage of the first dc power supply 200, the voltage dividing signal acts on the control end of the second switch circuit 20 to conduct the second switch circuit 20, the first dc power supply 200 is connected with the power supply circuit 300 of the fan, and the first dc power supply 200 supplies power to the fan to enable the fan to work normally.
The voltage dividing module 12 divides the voltage of the first dc power supply 200, and the divided voltage signal acts on the control terminal of the second switch circuit 20, so as to prevent the second switch circuit 20 from being damaged by the excessive voltage of the first dc power supply 200, thereby protecting the second switch circuit 20.
In some embodiments, with continued reference to fig. 2, the fan control circuit 100 further includes a power selection circuit 30. One end of the power selection circuit 30 is connected to the power supply 400 of the fan, the other end of the power selection circuit 30 is connected to the power supply 300 of the fan, and the power selection circuit 30 is configured to select a corresponding adapter circuit according to the power supply 400 of the fan.
The power supply 400 may be different, and the adapter circuit between the power supply 400 and the power supply circuit 300 may be different. By selecting different adaptive circuits, the power supply 400 of the fan can be matched with the power supply circuit 300, and the purpose that different power supplies 400 can supply power to the fan is achieved.
Therefore, the fan control circuit 100 can make the fan compatible with different power supplies 400 by selecting the matching adaptation circuit.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a fan control circuit according to an embodiment of the present invention, and as shown in fig. 3, the fan control circuit 100 further includes a third switch circuit 40 and a fourth switch circuit 50.
The control end of the third switch circuit 40 is configured to access the status signal, the first end of the third switch circuit 40 is connected to the control end of the fourth switch circuit 50, the second end of the third switch circuit 40 is grounded, the third end of the third switch circuit 40 is connected to the second dc power supply 500, and the third switch circuit 40 is configured to control the working state of the fourth switch circuit 50. A first end of the fourth switch circuit 50 is connected to a PWM signal end, the PWM signal end is used for accessing a PWM signal, the PWM signal is a driving signal of the fan, a second end of the fourth switch circuit 50 is grounded, and the fourth switch circuit 50 is used for controlling the driving of the fan by the PWM signal.
When the electronic equipment works normally, the electronic equipment outputs a PWM signal through a PWM signal end of the fan so as to drive the fan to operate. When the electronic device is in a shutdown or standby state, the PWM signal terminal of the fan is pulled up to a high level by a circuit inside the fan, and the fan rotates all the time, so that the control is disabled.
Therefore, the embodiment of the present invention provides another solution for preventing the control failure of the fan, that is, when the electronic device is in a shutdown or standby state, the PWM signal terminal of the fan is pulled down to a low level to stop rotating, so as to prevent the control failure of the fan.
Specifically, in conjunction with fig. 3, the operating principle of the fan control circuit 100 can be described as follows:
when the electronic device is in a shutdown or standby state, the state signal is a low level signal, the low level signal acts on the control terminal of the third switch circuit 40 to make it in a cut-off state, and further the second dc power supply 500 acts on the control terminal of the fourth switch circuit 50 through the third terminal of the third switch circuit 40, the fourth switch circuit 50 is turned on, the PWM signal terminal is pulled down to the ground through the first terminal of the fourth switch circuit 50 and the second terminal of the fourth switch circuit 50 to make it be a low level, so that the fan stops rotating because the driving signal is a low level signal;
if the electronic device is in a normal operation state, the state signal is a high level signal, the high level signal acts on the control terminal of the third switch circuit 40 to make it in an on state, the second dc power supply 500, the third terminal of the third switch circuit 40, the first terminal of the third switch circuit 40, the second terminal of the third switch circuit 40 and the ground form a closed loop, the first terminal of the third switch circuit 40 is pulled down to a low level, therefore, the control terminal of the fourth switch circuit 50 is also a low level signal, the fourth switch circuit 50 is turned off, the PWM signal terminal of the fan receives the PWM signal sent by EC, and the fan is controlled by the PWM signal to normally rotate.
In summary, when the electronic device is in a standby state or a shutdown state, the fan control circuit can pull down the PWM signal terminal of the fan to a low level, so that the fan stops rotating, thereby preventing the fan from being disabled, and further controlling the fan more accurately.
Referring to fig. 4, fig. 4 is a schematic circuit structure diagram of a fan control circuit according to an embodiment of the present invention, as shown in fig. 4, the first switch module 11 includes a first MOS transistor Q1 and a first resistor R1, the voltage dividing module 12 includes a second resistor R2 and a third resistor R3, a drain of the first MOS transistor Q1 is connected to a first end of the second resistor R2, a source of the first MOS transistor Q1 is grounded, a gate of the first MOS transistor Q1 is connected to one end of the first resistor R1, and another end of the first resistor R1 is used for accessing the status signal SLP _ S3 #.
A second end of the second resistor R2 is connected to the control end of the second switch circuit 20 and the first end of the third resistor R3, and a second end of the third resistor R3 is connected to the first dc power supply 200 and the first end of the second switch circuit 20.
The second switch circuit 20 includes a second MOS transistor Q2, a first capacitor C1, and a second capacitor C2. The source of the second MOS transistor Q2 is connected to the second end of the third resistor R3, the first dc power supply 200 and the one end of the first capacitor C1, the drain of the second MOS transistor Q2 is connected to the power supply circuit 300 of the fan, the drain of the second MOS transistor Q2 is used for outputting the power supply 400 of the fan, the gate of the second MOS transistor Q2 is connected to the other end of the first capacitor C1, the one end of the second capacitor C2, the second end of the second resistor R2 and the first end of the third resistor R3, and the other end of the second capacitor C2 is grounded.
The first resistor R1 is used for limiting current and protecting the gate of the first MOS transistor Q1. The first capacitor C1 and the second capacitor C2 are used for protecting the second MOS transistor Q2 and preventing the second MOS transistor Q2 from being burnt out by overshoot.
In some embodiments, the first switch circuit 10 further includes a first suppression capacitor C3, and the first suppression capacitor C3 is connected between the gate of the first MOS transistor Q1 and ground. The first suppression capacitor C3 is used for suppressing the miller effect of the first MOS transistor Q1.
In some embodiments, the fan control circuit 100 further includes a first filter capacitor C4, a second filter capacitor C5, and a third filter capacitor C6, wherein the first filter capacitor C4 is connected between the source of the second MOS transistor Q2 and the ground, the second filter capacitor C5 is connected between the drain of the second MOS transistor Q2 and the ground, the second filter capacitor C5 is connected in parallel with the third filter capacitor C6, and the first filter capacitor C4, the second filter capacitor C5, and the third filter capacitor C6 are all used for achieving a filtering effect.
The voltage of the first dc power supply 200 may be set as required, and may be the voltage of the power supply 400 of the fan, which is 12V in the embodiment of the present invention.
With reference to fig. 4, the operation principle of the fan control circuit 100 can be described as follows:
when the electronic device is in a shutdown or standby state, the state signal SLP _ S3# of the electronic device is a low level signal, the first MOS transistor Q1 is turned off, the second MOS transistor Q2 is turned off, the first dc power supply 200 is disconnected from the power supply circuit 300 of the fan, and the fan stops rotating due to power failure, thereby preventing control failure;
when the electronic device is in a normal operating condition, the state signal SLP _ S3# of the electronic device is a high level signal, the first MOS transistor Q1 is turned on, the second resistor R2 and the third resistor R3 divide the voltage of the first dc power supply 200, the divided voltage signal acts on the gate of the second MOS transistor Q2, the second MOS transistor Q2 is turned on, and the first dc power supply 200 is connected to the power supply circuit 300 of the fan to supply power to the fan normally.
In summary, when the electronic device is in a standby state or a shutdown state, the fan control circuit can cut off the power supply of the fan to stop the fan from rotating, thereby preventing the fan from being controlled to fail and further controlling the fan more accurately.
Referring to fig. 5, fig. 5 is a circuit structure diagram of a fan control circuit according to an embodiment of the present invention, as shown in fig. 5, the third switch circuit 40 includes a third MOS transistor Q3, a fourth resistor R4, and a fifth resistor R5, and the fourth switch circuit 50 includes a fourth MOS transistor Q4.
One end of the fourth resistor R4 is used for accessing the status signal SLP _ S3#, the other end of the fourth resistor R4 is connected to the gate of the third MOS transistor Q3, the source of the third MOS transistor Q3 is grounded, and the drain of the third MOS transistor Q3 is connected to one end of the fifth resistor R5 and the gate of the fourth MOS transistor Q4, respectively. The other end of the fifth resistor R5 is connected to the second dc power supply 500, the source of the fourth MOS transistor Q4 is grounded, and the drain of the fourth MOS transistor Q4 is connected to the PWM signal terminal.
The fourth resistor R4 and the fifth resistor R5 are both used for limiting current, so as to prevent the third MOS transistor Q3 and the fourth MOS transistor Q4 from being damaged due to excessive current.
In some embodiments, the third switch circuit 40 further includes a third suppression capacitor C7, and the third suppression capacitor C7 is connected between the gate of the third MOS transistor Q3 and the ground. The third suppression capacitor C7 is used for suppressing the miller effect of the third MOS transistor Q3.
The voltage of the second dc power supply 500 may be set as required, and may be the voltage of the power supply 400 of the fan, which is 12V in the embodiment of the present invention.
With reference to fig. 5, the operation principle of the fan control circuit 100 can be described as follows:
when the electronic device is in a shutdown or standby state, the state signal SLP _ S3# of the electronic device is a low level signal, the third MOS transistor Q3 is turned off, the second dc power supply 500 acts on the gate of the fourth MOS transistor Q4, the fourth MOS transistor Q4 is turned on, the PWM signal end is pulled down to ground, the PWM signal is always at a low level, and the fan stops rotating due to the low level of the driving signal, thereby preventing the control failure;
when the electronic device is in a normal operating condition, the state signal SLP _ S3# of the electronic device is a high level signal, the third MOS transistor Q3 is turned on, the gate of the fourth MOS transistor Q4 is pulled down to ground, the fourth MOS transistor Q4 is turned off, the PWM signal terminal normally receives a PWM signal sent by the EC of the electronic device, and the fan is controlled by the PWM signal and operates normally.
In summary, when the electronic device is in a standby state or a shutdown state, the fan control circuit can pull down the PWM signal terminal of the fan to a low level, so that the fan stops rotating, thereby preventing the fan from being disabled, and further controlling the fan more accurately.
Referring to fig. 6, fig. 6 is a schematic circuit structure diagram of a power selection circuit according to an embodiment of the invention, and as shown in fig. 6, the power selection circuit 30 includes a sixth resistor R6, a seventh resistor R7, a first switch K1, and a controller U1. One end of the sixth resistor R6 and one end of the seventh resistor R7 are commonly connected to the power supply circuit 300 of the fan. The other end of the sixth resistor R6 is connected to the first contact of the first switch K1, the other end of the seventh resistor R7 is connected to the second contact of the first switch K1, the control end of the first switch K1 is connected to the controller U1, the common end of the first switch K1 is connected to the power supply 400 of the fan, and the controller U1 is configured to control the operating state of the first switch K1 according to the power supply 400 of the fan.
If the power supply 400 of the fan is the first power supply, the controller U1 controls the common end of the first switch K1 to be connected with the first contact, so that the other end of the sixth resistor R6 is connected with the power supply 400 of the fan, and the other end of the seventh resistor R7 is disconnected from the power supply 400 of the fan, so that the first power supply supplies power to the fan through the power supply circuit 300 of the fan;
if the power supply 400 of the fan is the second power supply, the controller U1 controls the common end of the first switch K1 to be connected to the second contact, so that the other end of the sixth resistor R6 is disconnected from the power supply 400 of the fan, and the other end of the seventh resistor R7 is connected to the power supply 400 of the fan, so that the second power supply supplies power to the fan through the power supply circuit 300 of the fan.
The first power supply and the second power supply are determined according to the type of the fan, and in the embodiment of the invention, the voltage of the first power supply may be 12V, and the voltage of the second power supply may be 5V.
The controller U1 may be implemented as an internal controller to the fan or as an external controller. In some embodiments, the controller U1 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a single chip microcomputer, an arm (acorn RISC machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the controller U1 may be any conventional processor, controller, microcontroller, or state machine. The controller U1 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP, and/or any other such configuration.
In summary, when the electronic device is in standby or shutdown, the fan control circuit can cut off the power supply of the fan or make the driving signal of the fan be low level, so that the fan stops rotating, thereby preventing control failure of the fan and further more accurately controlling the fan.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A fan control circuit is applied to a fan, and is characterized in that the fan is used for dissipating heat of electronic equipment, and the fan control circuit comprises: a first switching circuit and a second switching circuit;
the control end of the first switch circuit is used for accessing a state signal of the electronic device, the first end of the first switch circuit is connected with the control end of the second switch circuit, the second end of the first switch circuit is grounded, the third end of the first switch circuit is respectively connected with the first end of the second switch circuit and a first direct current power supply, and the first switch circuit is used for controlling the working state of the second switch circuit;
the second end of the second switch circuit is connected with the power supply circuit of the fan, and the second switch circuit is used for controlling the connection state of the first direct-current power supply and the power supply circuit of the fan.
2. The fan control circuit of claim 1, wherein the first switching circuit comprises a first switching module and a voltage divider module;
the control end of the first switch module is used for accessing the state signal, the first end of the first switch module is connected with the first end of the voltage division module, and the second end of the first switch module is grounded;
the second end of the voltage division module is connected with the control end of the second switch circuit, and the third end of the voltage division module is respectively connected with the first direct current power supply and the first end of the second switch circuit.
3. The fan control circuit according to claim 2, wherein the first switch module includes a first MOS transistor and a first resistor, the voltage divider module includes a second resistor and a third resistor, a drain of the first MOS transistor is connected to a first end of the second resistor, a source of the first MOS transistor is grounded, a gate of the first MOS transistor is connected to one end of the first resistor, and another end of the first resistor is used for receiving the status signal;
the second end of the second resistor is connected with the control end of the second switch circuit and the first end of the third resistor respectively, and the second end of the third resistor is connected with the first direct-current power supply and the first end of the second switch circuit respectively.
4. The fan control circuit according to claim 3, wherein the second switch circuit comprises a second MOS transistor, a first capacitor and a second capacitor;
the source electrode of the second MOS tube is respectively connected with the second end of the third resistor, the first direct current power supply and one end of the first capacitor, the drain electrode of the second MOS tube is connected with the power supply circuit of the fan, the grid electrode of the second MOS tube is respectively connected with the other end of the first capacitor, one end of the second capacitor, the second end of the second resistor and the first end of the third resistor, and the other end of the second capacitor is grounded.
5. The fan control circuit of claim 1, further comprising a third switching circuit and a fourth switching circuit;
the control end of the third switch circuit is used for accessing the state signal, the first end of the third switch circuit is connected with the control end of the fourth switch circuit, the second end of the third switch circuit is grounded, the third end of the third switch circuit is connected with a second direct-current power supply, and the third switch circuit is used for controlling the working state of the fourth switch circuit;
the first end of the fourth switch circuit is connected with the PWM signal end, the PWM signal end is used for accessing a PWM signal, the PWM signal is a driving signal of the fan, the second end of the fourth switch circuit is grounded, and the fourth switch circuit is used for controlling the driving of the fan by the PWM signal.
6. The fan control circuit according to claim 5, wherein the third switch circuit comprises a third MOS transistor, a fourth resistor and a fifth resistor, and the fourth switch circuit comprises a fourth MOS transistor;
one end of the fourth resistor is used for accessing the state signal, the other end of the fourth resistor is connected with the grid electrode of the third MOS tube, the source electrode of the third MOS tube is grounded, and the drain electrode of the third MOS tube is respectively connected with one end of the fifth resistor and the grid electrode of the fourth MOS tube;
the other end of the fifth resistor is connected with the second direct-current power supply, the source electrode of the fourth MOS tube is grounded, and the drain electrode of the fourth MOS tube is connected with the PWM signal end.
7. The fan control circuit according to any one of claims 1 to 6, further comprising a power selection circuit, one end of the power selection circuit being connected to the power supply of the fan, the other end of the power selection circuit being connected to the power supply of the fan, the power selection circuit being configured to select a corresponding adapter circuit according to the power supply of the fan.
8. The fan control circuit of claim 7 wherein the power selection circuit comprises a sixth resistor, a seventh resistor, a first switch, and a controller;
one end of the sixth resistor and one end of the seventh resistor are connected to a power supply circuit of the fan together;
the other end of the sixth resistor is connected with the first contact of the first switch, the other end of the seventh resistor is connected with the second contact of the first switch, the control end of the first switch is connected with the controller, the public end of the first switch is connected with the power supply of the fan, and the controller is used for controlling the working state of the first switch according to the power supply of the fan.
9. A fan comprising the fan control circuit of any one of claims 1-8, the fan configured to dissipate heat from an electronic device.
10. An electronic device, characterized in that the electronic device comprises a fan according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210530703.XA CN114837980A (en) | 2022-05-16 | 2022-05-16 | Fan control circuit, fan and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210530703.XA CN114837980A (en) | 2022-05-16 | 2022-05-16 | Fan control circuit, fan and electronic equipment |
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| CN114837980A true CN114837980A (en) | 2022-08-02 |
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| CN202210530703.XA Pending CN114837980A (en) | 2022-05-16 | 2022-05-16 | Fan control circuit, fan and electronic equipment |
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| US20110037424A1 (en) * | 2009-08-11 | 2011-02-17 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd | Control circuit for fan |
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| CN201203775Y (en) * | 2008-06-10 | 2009-03-04 | 青岛海信宽带多媒体技术股份有限公司 | Standby control circuit |
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