CN114837980B - Fan control circuit, fan and electronic equipment - Google Patents
Fan control circuit, fan and electronic equipment Download PDFInfo
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- CN114837980B CN114837980B CN202210530703.XA CN202210530703A CN114837980B CN 114837980 B CN114837980 B CN 114837980B CN 202210530703 A CN202210530703 A CN 202210530703A CN 114837980 B CN114837980 B CN 114837980B
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- 239000003990 capacitor Substances 0.000 claims description 36
- 238000010586 diagram Methods 0.000 description 12
- 230000001629 suppression Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 208000013738 Sleep Initiation and Maintenance disease Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 206010022437 insomnia Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
本发明涉及一种风扇控制电路、风扇以及电子设备，该风扇控制电路包括第一开关电路以及第二开关电路，其中，当电子设备处于待机或关机情况时，电子设备的状态信号为低电平信号，其作用于第一开关电路的控制端，使其处于截止状态，进而控制第二开关电路处于截止状态，断开第一直流电源与风扇的供电电路的连接，风扇会因断电而无法转动。因此，当电子设备处于待机或关机情况下，该风扇控制电路可使得风扇的供电电源被切断，使其停止转动，防止其控制失效，进而能够更加精准地控制风扇。
The present invention relates to a fan control circuit, a fan and an electronic device, wherein the fan control circuit comprises a first switch circuit and a second switch circuit, wherein when the electronic device is in a standby or shutdown state, the state signal of the electronic device is a low-level signal, which acts on the control end of the first switch circuit to make it in a cut-off state, thereby controlling the second switch circuit to be in a cut-off state, disconnecting the connection between the first DC power supply and the power supply circuit of the fan, and the fan cannot rotate due to power failure. Therefore, when the electronic device is in a standby or shutdown state, the fan control circuit can cut off the power supply of the fan, stop it from rotating, prevent its control from failing, and thereby control the fan 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
The electronic equipment is easy to generate certain heat in the working process, and a fan is required to be used for radiating the heat. The driving signal of the fan is a PWM signal, and under normal conditions, the electronic device outputs the PWM signal through an internal embedded controller (Embeded Controller, abbreviated as "EC") 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 usually turned all the time, the fan is not controlled, 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 standby or shut down.
In order to solve the technical problems, the embodiment of the invention provides the following technical scheme:
In a first aspect, embodiments of the present invention provide a fan control circuit, applied to a fan,
The fan is used for radiating heat of the electronic equipment, and the fan control circuit comprises a first switch circuit and a second switch circuit;
The control end of the first switch circuit is used for accessing a state signal of the electronic equipment, 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 the 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 includes 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 dividing 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 connected with the first direct current power supply and the first end of the second switch circuit respectively.
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 electrode of the first MOS transistor is connected to a first end of the second resistor, a source electrode of the first MOS transistor is grounded, a gate electrode of the first MOS transistor is connected to one end of the first resistor, and the other end of the first resistor is used for accessing 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 end of the first direct current power supply and the first end of the second switch circuit respectively.
In some embodiments, the second switching circuit includes a second MOS transistor, a first capacitor, and a second capacitor;
the source 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 of the second MOS tube is connected with the power supply circuit of the fan, the grid 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 switching circuit is used for accessing the state signal, the first end of the third switching circuit is connected with the control end of the fourth switching circuit, the second end of the third switching circuit is grounded, the third end of the third switching circuit is connected with a second direct current power supply, and the third switching circuit is used for controlling the working state of the fourth switching circuit;
The first end of the fourth switch circuit is connected with a PWM signal end, the PWM signal end is used for being connected with 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 PWM signal to drive the fan.
In some embodiments, the third switching circuit includes a third MOS transistor, a fourth resistor, and a fifth resistor, and the fourth switching 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 fan power supply device 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 circuit of the fan, and the power supply selection circuit is used for selecting a corresponding adapting circuit according to the power supply of the fan.
In some embodiments, the power supply 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, the fan including a fan control circuit as described above, the fan being configured to dissipate heat from an electronic device.
In a third aspect, an embodiment of the present invention provides an electronic device including a 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, where when the electronic device is in a standby or power-off condition, a status signal of the electronic device is a low level signal, which acts on a control end of the first switch circuit to make the first switch circuit be in a cut-off state, and further controls the second switch circuit to be in a cut-off state, so that the connection between the first dc 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 or shutdown condition, the fan control circuit can cut off the power supply of the fan, stop the rotation of the fan, prevent the control failure of the fan, and further control the fan more accurately.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic diagram of a fan control circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a fan control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic 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 diagram of a circuit structure of a fan control circuit according to an embodiment of the present invention;
Fig. 6 is a schematic circuit diagram of a power supply selection circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a fan control circuit according to an embodiment of the invention. As shown in fig. 1, the fan control circuit is applied to a fan, wherein the fan is used for radiating heat to an electronic device. When the electronic equipment works, each electronic component in the electronic equipment can generate certain thermal power, so that the working temperature of the electronic component is increased, and the electronic component generally has the highest working temperature specification requirement, so that a structural component for heat dissipation is required to be arranged in the electronic equipment to realize heat dissipation of each electronic component in the electronic equipment, and the electronic equipment can work stably for a long time.
In general, a fan is arranged at an air outlet of electronic equipment, so that the electronic equipment sucks air flow from the air inlet and blows the air flow from the air outlet through the fan to form an air flow channel, and electronic components in the electronic equipment are ventilated and radiated.
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 internal embedded controller (Embeded Controller, abbreviated as "EC") 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 usually in a normal state, the internal circuit of the fan will pull up the PWM terminal to a high level, so that the PWM terminal always outputs a high level signal, and the fan will be in a constantly rotating state and not controlled.
Therefore, the embodiment of the invention provides a fan control circuit, so that the fan can be controlled 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 end of the first switch circuit 10 is used for accessing a status signal of the electronic device, a first end of the first switch circuit 10 is connected with a control end of the second switch circuit 20, a second end of the first switch circuit 10 is grounded, a third end of the first switch circuit 10 is connected with a first end of the second switch circuit 20 and the first dc power supply 200, and the first switch circuit 10 is used for controlling a working state of the second switch circuit 20.
The 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 used for outputting the power supply of the fan, and the second switch circuit 20 is used for controlling the connection state of the first dc power supply 200 and the power supply circuit 300 of the fan.
The status signals of the electronic devices are used for reflecting the status of the electronic devices, and the status signals of different electronic devices are different. If the electronic equipment is in a normal running 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.
The first switch circuit 10 is in an on state when the status signal is a high level signal, and the first switch circuit 10 is in an off state when the status signal is a low level signal. The working state of the first switch circuit 10 can control the working state of the second switch circuit 20 to be turned on or off, so as to control the connection state of the power supply of the fan and the power supply circuit 300 of the fan, thereby controlling 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 be used as a power supply for a fan.
The operation of the fan control circuit 100 can be described as follows, in conjunction with fig. 1:
If the electronic device is in the shutdown, sleep or dormant 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 the electronic device in the off state, and then the control end of the second switch circuit 20 is at a low level, the second switch circuit 20 is turned off, the first direct current power supply 200 is disconnected from the power supply circuit 300 of the fan, and the fan has no power supply, so that the fan stops rotating due to power failure;
If the electronic device is in the 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 the control end of the first switch circuit 10 in the on 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 control end of the second switch circuit 20 are formed into 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, the control end of the second switch circuit 20 is at a high level, the second switch circuit 20 is turned on, the first dc power supply 200 is connected 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 the PWM signal sent by the EC of the electronic device to normally rotate.
In summary, when the electronic device is in a standby or power-off condition, the fan control circuit 100 can cut off the power supply of the fan, stop the rotation of the fan, prevent the control failure, and further control the fan more accurately.
Referring to fig. 2, fig. 2 is a schematic diagram of a fan control circuit according to an embodiment of the invention, and as shown in fig. 2, the first switch circuit 10 includes a first switch module 11 and a voltage dividing module 12. The control end of the first switch module 11 is configured to access the status signal, a first end of the first switch module 11 is connected to a first end of the voltage dividing module 12, a second end of the first switch module 11 is grounded, a second end of the voltage dividing module 12 is connected to the control end of the second switch circuit 20, and a third end of the voltage dividing module 12 is connected to the first end of the second switch circuit 20 and the first dc power supply 200 respectively.
When the status signal is a low level signal, the control end of the first switch module 11 is low level, the first switch module 11 is in a cut-off state, and then 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 as to prevent the fan from rotating all the time, and control fails.
When the status signal is a high level signal, the control end of the first switch module 11 is at 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 the voltage of the first dc power supply 200, the divided voltage signal acts on the control end of the second switch circuit 20, so that the second switch circuit 20 is conducted, 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, so that the fan works normally.
The voltage dividing module 12 divides the voltage of the first dc power supply 200, and the divided signal acts on the control terminal of the second switching circuit 20, so that the second switching circuit 20 is prevented from being damaged due to the excessive voltage of the first dc power supply 200.
In some embodiments, referring still to FIG. 2, the fan control circuit 100 further includes a power supply selection circuit 30. One end of the power supply selection circuit 30 is connected with the power supply 400 of the fan, the other end of the power supply selection circuit 30 is connected with the power supply 300 of the fan, and the power supply selection circuit 30 is used for selecting a corresponding adapting circuit according to the power supply 400 of the fan.
The types of fans may be different, the power supply 400 may be different, and the adapting circuit between the power supply 400 and the power supply circuit 300 may be different. By selecting different adapting circuits, the power supply 400 of the fan can be matched with the power supply circuit 300, so that the purpose that different power supplies 400 can supply power to the fan is achieved.
Thus, the fan control circuit 100 can make the fan compatible with different power supplies 400 by selecting a matching adapter circuit.
Referring to fig. 3, fig. 3 is a schematic 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 be connected to 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 status of the fourth switch circuit 50. The 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, the second end of the fourth switch circuit 50 is grounded, and the fourth switch circuit 50 is used for controlling the PWM signal to drive the fan.
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 run. When the electronic equipment is in a shutdown or standby condition, the PWM signal end of the fan is pulled up to a high level by a circuit in the fan, and the fan can rotate all the time and is in failure control.
Therefore, the embodiment of the invention provides another scheme for preventing the control failure of the fan, namely when the electronic equipment is in a shutdown or standby condition, the PWM signal end of the fan is pulled down to a low level, so that the rotation of the fan is stopped, and the control failure of the fan is prevented.
Specifically, with reference to fig. 3, the operation principle of the fan control circuit 100 can be described as follows:
when the electronic device is in the off or standby condition, the state signal is a low level signal, the low level signal acts on the control end of the third switch circuit 40 to make the third switch circuit 40 in the off state, and then the second dc power supply 500 acts on the control end of the fourth switch circuit 50 through the third end of the third switch circuit 40, the fourth switch circuit 50 is turned on, the PWM signal end is pulled down to the ground through the first end of the fourth switch circuit 50 and the second end of the fourth switch circuit 50 to make the fan be at a low level, so that the fan stops rotating due to the driving signal being the 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 end of the third switch circuit 40 to make the control end of the third switch circuit 40 in a conducting state, the second dc power supply 500, the third end of the third switch circuit 40, the first end of the third switch circuit 40, the second end of the third switch circuit 40 and the formation of a closed loop, the first end of the third switch circuit 40 is pulled down to a low level, therefore, the control end of the fourth switch circuit 50 is also a low level signal, the fourth switch circuit 50 is turned off, the PWM signal end of the fan receives the PWM signal sent by the EC, and the fan is controlled by the PWM signal to rotate normally.
In summary, when the electronic device is in standby or power-off condition, the fan control circuit can enable the PWM signal end of the fan to be pulled down to a low level, so that the fan stops rotating, control failure is prevented, and the fan can be controlled more accurately.
Referring to fig. 4, fig. 4 is a schematic circuit 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 electrode of the first MOS transistor Q1 is connected to a first end of the second resistor R2, a source electrode of the first MOS transistor Q1 is grounded, a gate electrode 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#.
The 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 the second end of the third resistor R3 is connected to the first end of the first dc power supply 200 and the first end of the second switch circuit 20, respectively.
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 one end of the first capacitor C1, the drain of the second MOS transistor Q2 is connected to the power supply 300 of the fan, the drain of the second MOS transistor Q2 is used for outputting the power supply 400 of the fan, and the gate of the second MOS transistor Q2 is connected to the other end of the first capacitor C1, one end of the second capacitor C2, the second end of the second resistor R2, and the first end of the third resistor R3, where the other end of the second capacitor C2 is grounded.
The first resistor R1 is used for limiting current and protecting the grid electrode of the first MOS tube Q1. The first capacitor C1 and the second capacitor C2 are used for protecting the second MOS transistor Q2, so as to prevent 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, where the first suppression capacitor C3 is connected between the gate of the first MOS transistor Q1 and ground. The first suppressing capacitor C3 is configured to suppress a 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 the 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.
The operation of the fan control circuit 100 can be described as follows, in conjunction with fig. 4:
when the electronic equipment is in the shutdown or standby condition, the state signal SLP_S3# of the electronic equipment is a low level signal, the first MOS tube Q1 is cut off, the second MOS tube Q2 is cut off, the first direct current power supply 200 is disconnected with the power supply circuit 300 of the fan, and the fan stops rotating due to power failure, so that the control failure of the fan is prevented;
When the electronic device is in a normal working 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 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 with the power supply circuit 300 of the fan to supply power to the fan normally.
In summary, when the electronic device is in standby or power-off condition, the fan control circuit can cut off the power supply of the fan, stop the rotation of the fan, prevent the control failure of the fan, and further control the fan more accurately.
Referring to fig. 5, fig. 5 is a schematic circuit 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 with 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 with 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 used for limiting current, and the third MOS tube Q3 and the fourth MOS tube Q4 are prevented from being damaged due to overlarge current.
In some embodiments, the third switching 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 ground. The third suppression capacitor C7 is configured to suppress the miller effect of the third MOS transistor Q3.
The voltage of the second dc power supply 500 may be set according to needs, and may be the voltage of the power supply 400 of the fan, which is 12V in the embodiment of the present invention.
The operation of the fan control circuit 100 can be described as follows, in conjunction with fig. 5:
When the electronic device is in the power-off or standby condition, 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 terminal is pulled down to the ground, the PWM signal is always at a low level, and the fan stops rotating due to the low level of the driving signal, so as to prevent the control failure;
When the electronic equipment is in a normal working condition, the state signal SLP_S3# of the electronic equipment is a high-level signal, the third MOS tube Q3 is conducted, the grid electrode of the fourth MOS tube Q4 is pulled down to the ground, the fourth MOS tube Q4 is cut off, the PWM signal end normally receives a PWM signal sent by the EC of the electronic equipment, and the fan is controlled by the PWM signal and normally works.
In summary, when the electronic device is in standby or power-off condition, the fan control circuit can enable the PWM signal end of the fan to be pulled down to a low level, so that the fan stops rotating, control failure is prevented, and the fan can be controlled more accurately.
Referring to fig. 6, fig. 6 is a schematic circuit diagram of a power supply selection circuit according to an embodiment of the invention, and as shown in fig. 6, the power supply 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 with the first contact of the first switch K1, the other end of the seventh resistor R7 is connected with the second contact of the first switch K1, the control end of the first switch K1 is connected with the controller U1, the public end of the first switch K1 is connected with the power supply 400 of the fan, and the controller U1 is used for controlling the working 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 terminal 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 controls the other end of the seventh resistor R7 to be disconnected with 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 terminal of the first switch K1 to be connected with the second contact, so that the other end of the sixth resistor R6 is disconnected with the power supply 400 of the fan, and controls the other end of the seventh resistor R7 to be connected with 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 by a controller inside the fan or by an external controller. In some embodiments, 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, 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 power-off condition, the fan control circuit can cut off the power supply of the fan or make the driving signal of the fan be low level, stop the rotation of the fan, prevent the control failure, and further control the fan more accurately.
It should finally be noted that the above embodiments are only intended to illustrate the technical solution of the present application and not to limit it, that the technical features of the above embodiments or of the different embodiments may be combined in any order, and that many other variations in the different aspects of the present application as described above exist, which are not provided in details for the sake of brevity, and that although the application has been described in the detailed description with reference to the foregoing embodiments, it should be understood by those skilled in the art that it may still make modifications to the technical solution described in the foregoing embodiments or equivalent to some of the technical features thereof, where these modifications or substitutions do not depart from the essence of the corresponding technical solution from the scope of the technical solution of the embodiments of the present application.
Claims (9)
1. A fan control circuit is applied to a fan and is characterized in that the fan is used for radiating heat of electronic equipment, and the fan control circuit comprises a first switch circuit and a second switch circuit;
The control end of the first switch circuit is used for accessing a state signal of the electronic equipment, 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 the 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;
The fan control circuit further comprises a third switch circuit and a fourth switch circuit;
The control end of the third switching circuit is used for accessing the state signal, the first end of the third switching circuit is connected with the control end of the fourth switching circuit, the second end of the third switching circuit is grounded, the third end of the third switching circuit is connected with a second direct current power supply, and the third switching circuit is used for controlling the working state of the fourth switching circuit;
The first end of the fourth switching circuit is connected with a PWM signal end, the PWM signal end is used for being connected with a PWM signal, the PWM signal is a driving signal of the fan, the second end of the fourth switching circuit is grounded, and the fourth switching circuit is used for controlling the PWM signal to drive the fan;
When the electronic equipment is in an off state or a standby state, the state signal controls the third switching circuit to be in an off state, and the fourth switching circuit is in an on state, so that the PWM signal end is pulled down to a low level, and then the fan stops rotating.
2. The fan control circuit of claim 1, wherein 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 dividing 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 connected with the first direct current power supply and the first end of the second switch circuit respectively.
3. The fan control circuit of claim 2, wherein the first switch module comprises a first MOS transistor and a first resistor, the voltage dividing module comprises a second resistor and a third resistor, a drain electrode of the first MOS transistor is connected to a first end of the second resistor, a source electrode of the first MOS transistor is grounded, a gate electrode of the first MOS transistor is connected to one end of the first resistor, and the other end of the first resistor is used for accessing 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 end of the first direct current power supply and the first end of the second switch circuit respectively.
4. The fan control circuit of claim 3, wherein the second switching circuit comprises a second MOS transistor, a first capacitor, and a second capacitor;
the source 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 of the second MOS tube is connected with the power supply circuit of the fan, the grid 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, wherein the third switching circuit comprises a third MOS transistor, a fourth resistor, and a fifth resistor, the fourth switching circuit comprising 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.
6. The fan control circuit of any of claims 1-5, further comprising a power selection circuit, wherein one end of the power selection circuit is connected to a power supply of the fan, and the other end of the power selection circuit is connected to the power supply of the fan, and the power selection circuit is configured to select a corresponding adapter circuit according to the power supply of the fan.
7. The fan control circuit of claim 6, wherein the power supply 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.
8. A fan comprising a fan control circuit according to any of claims 1-7 for dissipating heat from an electronic device.
9. An electronic device, characterized in that, the electronic device comprising the fan of claim 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210530703.XA CN114837980B (en) | 2022-05-16 | 2022-05-16 | Fan control circuit, fan and electronic equipment |
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| CN202210530703.XA CN114837980B (en) | 2022-05-16 | 2022-05-16 | Fan control circuit, fan and electronic equipment |
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| CN114837980B true CN114837980B (en) | 2024-12-20 |
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| CN101994718B (en) * | 2009-08-11 | 2014-12-17 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN201995064U (en) * | 2010-12-27 | 2011-09-28 | 北京牡丹电子集团有限责任公司 | Power supply control circuit of projection television |
| CN105611200B (en) * | 2015-12-28 | 2018-09-04 | 深圳Tcl数字技术有限公司 | Zero consumption standby circuit and Zero-power-consumption standby TV |
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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 |
| CN203827366U (en) * | 2014-04-16 | 2014-09-10 | 西安伦普电子科技有限公司 | Digital signal processing system tester based on IEEE1394 protocol |
| CN112068614A (en) * | 2020-09-09 | 2020-12-11 | 深圳市道通智能航空技术有限公司 | Temperature control heat dissipation circuit and electronic equipment |
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