Fan control circuit and electronic equipment

Abstract

The utility model discloses a fan control circuit and electronic equipment, and relates to the field of heat dissipation control, the fan control circuit comprises a detection assembly, and the first output end of the detection assembly is used for outputting a temperature signal of the electronic equipment; the first receiving end of the control assembly is connected with the first output end of the detection assembly, and the first output end of the control assembly is used for outputting an enabling control signal corresponding to the temperature signal; the enabling end of the driving assembly is connected with the first output end of the control assembly, and the output end of the driving assembly is used for outputting a current PWM signal corresponding to the enabling control signal; the switch assembly is connected with the fan and comprises at least one switch tube, the control end of the at least one switch tube is connected with the output end of the driving assembly, and the switch tube is connected or disconnected according to the current PWM signal so as to adjust the rotating speed of the fan. The fan can be accurately adjusted, and noise and energy consumption are reduced while the heat dissipation effect is ensured.

Description

Technical Field

[0001] The present application relates to the field of heat dissipation control, and in particular to a fan control circuit and electronic equipment. Background Art

[0002] With the development of science and technology, the application fields of electronic equipment are becoming more and more extensive, from computers, mobile phones to various industrial equipment, all of which are inseparable from the support of electronic technology. In electronic equipment, efficient heat dissipation can not only ensure the stable operation of electronic equipment, but also extend its service life. At present, fans are usually used as heat dissipation devices in electronic equipment. Traditional fan control circuits mostly use simple switch control. Switch control cannot adjust the fan speed in real time according to the temperature of the equipment, resulting in unstable heat dissipation effect.

[0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present. Utility Model Content

[0004] The purpose of this application is to provide a fan control circuit and electronic equipment, which can accurately adjust the fan to ensure the heat dissipation effect while reducing noise and energy consumption.

[0005] In order to solve the above technical problems, the present application provides a fan control circuit, comprising:

[0006] The detection component comprises a first output terminal, wherein the first output terminal of the detection component is used to output a temperature signal of the electronic device;

[0007] A control component, comprising a first receiving end and a first output end, wherein the first receiving end of the control component is connected to the first output end of the detection component, and the first output end of the control component is used to output an enable control signal corresponding to the temperature signal;

[0008] A driving component, comprising an enable terminal and an output terminal, wherein the enable terminal of the driving component is connected to the first output terminal of the control component, and the output terminal of the driving component is used to output a current PWM signal corresponding to the enable control signal;

[0009] The switch component connected to the fan includes at least one switch tube, at least one control end of the switch tube is connected to the output end of the drive component, and the switch tube is used to be turned on or off according to the current PWM signal to adjust the speed of the fan.

[0010] Optionally, the switch assembly includes a first switch tube and a second switch tube, wherein:

[0011] The first end of the first switch tube is connected to the power supply, the second end of the first switch tube is connected to the second end of the second switch tube, the first end of the second switch tube is connected to the fan, and the control end of the first switch tube and the control end of the second switch tube are both connected to the output end of the driving component;

[0012] The current flow direction of the body diode of the first switch tube is opposite to the current flow direction of the body diode of the second switch tube.

[0013] Optionally, the switch assembly further includes a third switch tube and a fourth switch tube, wherein:

[0014] The first end of the third switch tube is connected to the first end of the first switch tube, the second end of the third switch tube is respectively connected to the second end of the second switch tube and the second end of the fourth switch tube, and the first end of the fourth switch tube is connected to the fan;

[0015] The current flow direction of the body diode of the third switch tube is the same as the current flow direction of the body diode of the first switch tube, and the current flow direction of the body diode of the fourth switch tube is the same as the current flow direction of the body diode of the second switch tube.

[0016] Optionally, the fan control circuit further includes a transistor, a first diode, a first resistor and a first capacitor, wherein:

[0017] The first end of the transistor is connected to the control end of the second switch tube, the second end of the transistor is respectively connected to the second end of the first switch tube and the anode of the first diode, the control end of the transistor is respectively connected to the cathode of the first diode, the first end of the first resistor and the first end of the first capacitor, and the second end of the first resistor and the second end of the first capacitor are both grounded.

[0018] Optionally, the detection component further includes a second output terminal, and the second output terminal of the detection component is used to output a power supply voltage signal of the electronic device;

[0019] The control component further comprises a second receiving end and a second output end, the second receiving end of the control component is connected to the second output end of the detection component, and the second output end of the control component is used to output an undervoltage lockout control signal corresponding to the power supply voltage signal;

[0020] The driving component also includes an undervoltage protection terminal, the undervoltage protection terminal of the driving component is connected to the second output terminal of the control component, and the output terminal of the driving component is used to output a current PWM signal corresponding to the undervoltage lockout control signal.

[0021] Optionally, the fan control circuit further includes a fifth switch tube, a second resistor and a third resistor, wherein:

[0022] The control end of the fifth switch tube is connected to the second output end of the control component, the first end of the fifth switch tube is connected to the undervoltage protection end of the driving component, the second end of the fifth switch tube is grounded, the first end of the second resistor is grounded, the first end of the second resistor is respectively connected to the first end of the third resistor and the undervoltage protection end of the driving component, and the first end of the third resistor is connected to the power supply.

[0023] Optionally, the driving component further includes an overvoltage protection terminal;

[0024] The fan control circuit also includes a fourth resistor and a fifth resistor, the first end of the fourth resistor is connected to the power supply, the second end of the fourth resistor is respectively connected to the first end of the fifth resistor and the overvoltage protection end of the driving component, and the second end of the fifth resistor is grounded.

[0025] Optionally, the fan control circuit further includes a second diode, a cathode of the second diode is connected to the first end of the fan, and an anode of the second diode and the second end of the fan are both grounded.

[0026] Optionally, the fan control circuit further includes a sixth switch tube, a sixth resistor and a seventh resistor, wherein:

[0027] The control end of the sixth switch tube and the first end of the sixth resistor are both connected to the first output end of the control component, the second end of the sixth switch tube is grounded, the first end of the sixth switch tube is respectively connected to the second end of the sixth resistor and the second end of the seventh resistor, and the second end of the seventh resistor is connected to the power supply.

[0028] In order to solve the above technical problems, the present application also provides an electronic device, including a fan and a fan control circuit as described in any one of the above items connected to the fan.

[0029] The present application provides a fan control circuit, which collects the temperature signal of the electronic device in real time through the detection component, and the control component controls the driving component to output the corresponding PWM signal according to the temperature signal, and the PWM signal controls the conduction or disconnection of the switch tube in the switch component, thereby realizing accurate control of the fan speed, improving the response speed, and adjusting the fan speed according to the real-time temperature of the electronic device, ensuring the heat dissipation effect while reducing noise and energy consumption. The present application also provides an electronic device, which has the same beneficial effects as the above-mentioned fan control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of the first fan control circuit provided in this application;

[0032] Figure 2a and Figure 2b This is a schematic diagram of the structure of the temperature acquisition module provided in this application;

[0033] Figure 3 A schematic diagram of the structure of a second fan control circuit provided in this application;

[0034] Figure 4 A schematic diagram of the structure of a current and voltage detection circuit provided in this application;

[0035] Figure 5 This is a schematic structural diagram of a third fan control circuit provided in this application. DETAILED DESCRIPTION

[0036] The core of this application is to provide a fan control circuit and electronic equipment that can accurately adjust the fan to ensure heat dissipation while reducing noise and energy consumption.

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] First, please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a fan control circuit provided in the present application, and the fan control circuit includes:

[0039] The detection component 1 comprises a first output terminal, and the first output terminal of the detection component 1 is used to output a temperature signal of the electronic device;

[0040] The control component 2 includes a first receiving end and a first output end, the first receiving end of the control component 2 is connected to the first output end of the detection component 1, and the first output end of the control component 2 is used to output an enabling control signal corresponding to the temperature signal;

[0041] The driving component 3 comprises an enabling terminal and an output terminal, the enabling terminal of the driving component 3 is connected to the first output terminal of the control component 2, and the output terminal of the driving component 3 is used to output a current PWM signal corresponding to the enabling control signal;

[0042] The switch component 4 connected to the fan includes at least one switch tube, a control end of at least one switch tube is connected to the output end of the drive component 3, and the switch tube is used to be turned on or off according to the current PWM signal to adjust the speed of the fan.

[0043] In this embodiment, the fan control circuit includes a detection component 1, a control component 2, a drive component 3 and a switch component 4, wherein the detection component 1 is used to detect electrical signals in the electronic device, including but not limited to temperature signals, voltage signals and current signals, etc. Accordingly, the detection component 1 includes but is not limited to a temperature detection module for detecting temperature signals, a voltage detection module for detecting voltage signals, and a current detection module for detecting current. The output end of the temperature detection module is the first output end of the detection component 1 in this embodiment. The temperature detection module can be implemented by a component, circuit, chip or a combination thereof having a temperature detection function, refer to Figure 2a As shown, Figure 2a This is a structural schematic diagram of a temperature detection module provided in this embodiment. The temperature detection module mainly includes a temperature detection chip U1. The temperature detection chip U1 includes an SCL (clock signal) pin, a GND (ground) pin, an ALERT (alarm) pin, an SDA (data) pin, a V+ (power supply) pin, and an ADD0 (address selection) pin. The SCL pin is connected to the TMP_SCL signal terminal, the SDA pin is connected to the TEM_SDA signal terminal, and the ALERT pin is connected to the TMP_ALERT signal terminal. In order to avoid pin floating and reduce interference, refer to Figure 2b As shown, in this embodiment, pull-up resistors R are respectively provided for the TMP_SCL signal terminal, the TEM_SDA signal terminal, and the TMP_ALERT signal terminal. U1 , R U2 and R U3 .

[0044] The control component 2 at least includes a first receiving end and a first output end. The first receiving end of the control component 2 is connected to the first output end of the detection component 1, that is, the first receiving end of the control component 2 is connected to the first output end of the temperature detection module. It can be understood that the first output end of the temperature detection module may include at least one, such as an SDA pin and / or an ALERT pin, so that the control component 2 can access the temperature signal output by the SDA pin and / or the alarm signal output by the ALERT pin. The control component 2 is used to generate an enable control signal FAN_EN according to the temperature signal. Specifically, when the temperature value corresponding to the temperature signal satisfies the corresponding temperature range, an enable control signal corresponding to the temperature range is generated. Exemplarily, assuming that the temperature value of the temperature signal is in the high temperature range, the generated enable control signal is a first enable signal. Assuming that the temperature value of the temperature signal is in the normal temperature range (the upper limit value of the normal temperature range is less than the lower limit value of the high temperature range), the generated enable control signal is a second enable signal, wherein the first enable signal and the second enable signal can be signals with opposite level states, such as the first enable signal is a high level signal and the second enable signal is a low level signal. The first output terminal of the control component 2 is used to output the first enable signal or the second enable signal. The control component 2 in this embodiment can be implemented in the form of a component, chip, circuit or a combination thereof having the above functions, which is not specifically limited in this embodiment.

[0045] The driving component 3 at least includes an enable terminal and an output terminal. The enable terminal of the driving component 3 is connected to the first output terminal of the control component 2 to access the enable control signal output by the control component 2. The output terminal of the driving component 3 outputs a corresponding PWM (Pulse Width Modulation) signal according to the enable control signal accessed by its enable terminal. For example, assuming that the enable terminal of the driving component 3 is connected to the first enable signal, the output terminal of the driving component 3 can output a first PWM signal. assuming that the enable terminal of the driving component 3 is connected to the second enable signal, the output terminal of the driving component 3 can output a second PWM signal. Different PWM signals have different duty cycles. The driving component 3 in this embodiment can be specifically implemented in the form of a component, chip, circuit or a combination thereof having the above functions, which is not limited in this embodiment.

[0046] The switch component 4 is connected to the fan, and the switch component 4 includes at least one switch tube. The control end of at least one switch tube is connected to the output end of the driving component 3, so as to be controlled by the PWM signal output by the driving component 3 to perform the action of turning on or off. It can be understood that when the PWM signal output by the driving component 3 is different, the time that each switch tube is in the on state will change, so that the power supply voltage of the fan changes. The power supply voltage of the fan and the fan speed are positively correlated. Therefore, this embodiment can adjust the speed of the fan in real time according to the temperature signal of the electronic device, so as to achieve precise control. Among them, the switch tube can select a MOS tube, and the gate of the MOS tube is used as the control end of the switch tube. It can be seen that in this embodiment, the temperature signal of the electronic device is collected in real time by the detection component 1, and the control component 2 controls the driving component 3 to output the corresponding PWM signal according to the temperature signal. The PWM signal controls the on or off of the switch tube in the switch component 4, so as to achieve precise control of the fan speed, improve the response speed, and adjust the fan speed according to the real-time temperature of the electronic device, so as to ensure the heat dissipation effect while reducing noise and energy consumption.

[0047] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of the second fan control circuit provided in the present application. The fan control circuit is based on the above embodiment:

[0048] In an exemplary embodiment, the switch assembly 4 includes a first switch tube Q1 and a second switch tube Q2, wherein:

[0049] A first end of the first switch tube Q1 is connected to a power source, a second end of the first switch tube Q1 is connected to a second end of the second switch tube Q2, a first end of the second switch tube Q2 is connected to a fan, and a control end of the first switch tube Q1 and a control end of the second switch tube Q2 are both connected to an output end of the driving component 3;

[0050] The current flow direction of the body diode of the first switch tube Q1 is opposite to the current flow direction of the body diode of the second switch tube Q2.

[0051] Considering that after the fan starts to rotate, if the power supply is suddenly stopped, the fan will continue to rotate due to inertia. At this time, the fan can be regarded as a generator and will generate current. Therefore, the switch component 4 in this embodiment includes a first switch tube Q1 and a second switch tube Q2. The control end of the first switch tube Q1 and the control end of the second switch tube Q2 are both connected to the output end of the drive component 3. The first switch tube Q1 and the second switch tube Q2 are arranged opposite to each other. When the fan generates current, the second switch tube Q2 can prevent current backflow, thereby improving the safety of the fan control circuit.

[0052] In this embodiment, both the first switch tube Q1 and the second switch tube Q2 can be MOS tubes, the gate of the MOS tube serves as the control end of the switch tube, the drain of the MOS tube serves as the first end of the switch tube, and the source of the MOS tube serves as the second end of the switch tube.

[0053] In an exemplary embodiment, the switch assembly 4 further includes a third switch tube Q3 and a fourth switch tube Q4, wherein:

[0054] A first end of the third switch tube Q3 is connected to a first end of the first switch tube Q1, a second end of the third switch tube Q3 is respectively connected to a second end of the second switch tube Q2 and a second end of the fourth switch tube Q4, and a first end of the fourth switch tube Q4 is connected to a fan;

[0055] The current flow direction of the body diode of the third switch tube Q3 is the same as the current flow direction of the body diode of the first switch tube Q1 , and the current flow direction of the body diode of the fourth switch tube Q4 is the same as the current flow direction of the body diode of the second switch tube Q2 .

[0056] In this embodiment, the switch component 4 also includes a third switch tube Q3 and a fourth switch tube Q4. The third switch tube Q3 is connected in parallel with the first switch tube Q1, and the fourth switch tube Q4 is connected in parallel with the second switch tube Q2. By having multiple switch tubes share the large current, the load of a single switch tube is reduced, the overcurrent capacity can be increased, and the safe and stable operation of each switch tube can be ensured.

[0057] The third switch tube Q3 and the fourth switch tube Q4 can both be MOS tubes, with the gate of the MOS tube serving as the control end of the switch tube, the drain of the MOS tube serving as the first end of the switch tube, and the source of the MOS tube serving as the second end of the switch tube.

[0058] Of course, in addition to connecting the third switch tube Q3 and the fourth switch tube Q4 in parallel, multiple switch tubes can also be connected in parallel on this basis, and the configuration can be based on actual engineering needs. This embodiment does not make any specific limitations here.

[0059] As another optional embodiment, the parameters of the parallel switch tubes in the switch assembly 4 are the same to further ensure the working stability of the parallel MOS tubes, which helps to reduce the instability and failure rate caused by parameter mismatch.

[0060] In an exemplary embodiment, the fan control circuit further includes a transistor T1, a first diode, a first resistor R1 and a first capacitor C1, wherein:

[0061] The first end of the transistor T1 is connected to the control end of the second switch tube Q2, the second end of the transistor T1 is respectively connected to the second end of the first switch tube Q1 and the anode of the first diode, the control end of the transistor T1 is respectively connected to the cathode of the first diode, the first end of the first resistor R1 and the first end of the first capacitor C1, and the second end of the first resistor R1 and the second end of the first capacitor C1 are both grounded.

[0062] In this embodiment, the fan control circuit also includes a transistor T1, a first diode, a first resistor R1 and a first capacitor C1. The first diode is arranged between the base and the emitter of the transistor T1. The transistor T1 cooperates with the first diode to achieve a clamping effect to prevent excessive signals from damaging circuit components. Specifically, the fast switching characteristics of the first diode can effectively limit the amplitude of the signal.

[0063] In an exemplary embodiment, the detection component 1 further includes a second output terminal, and the second output terminal of the detection component 1 is used to output a power supply voltage signal of the electronic device;

[0064] The control component 2 also includes a second receiving end and a second output end, the second receiving end of the control component 2 is connected to the second output end of the detection component 1, and the second output end of the control component 2 is used to output an undervoltage lockout control signal corresponding to the power supply voltage signal;

[0065] The driving component 3 also includes an undervoltage protection terminal, which is connected to the second output terminal of the control component 2. The output terminal of the driving component 3 is used to output a current PWM signal corresponding to the undervoltage lockout control signal.

[0066] In this embodiment, the detection component 1 also includes a voltage detection module, the output end of the voltage detection module is the second output end of the detection component 1, and the voltage detection module is used to detect and output the power supply voltage signal of the electronic device, wherein the voltage detection module can be implemented in the form of a component, chip, circuit or a combination thereof having a voltage detection function. For example, refer to Figure 4 As shown, Figure 4A current and voltage detection circuit provided in this embodiment includes a current and voltage detection chip U2 and its peripheral circuits. The current and voltage detection chip U2 includes an SCL pin, an SDA pin, a VBUS pin, an IN- pin, an IN+ pin, an NC pin, a GND pin, an A0 pin and an A1 pin, wherein the SCL pin is a clock line in the I2C communication protocol, which is used to synchronize the data transmission timing and is controlled by the master device to generate a clock signal to control the data transmission speed. The SDA pin is a data line in the I2C communication protocol, which is used to transmit data, including control commands and detection data, etc. The VBUS pin is a power supply pin, which is used to connect the power bus to ensure the normal power supply of the chip. The IN- pin: This is used to measure the low-side current The input pin is usually used with the IN+ pin to measure bidirectional current. The IN+ pin is an input pin for measuring high-side current and is usually used with the IN- pin to measure bidirectional current. The NC pin is a pin with no internal connection and has no function. GND pin: This is a ground pin used to provide a reference point for the circuit and ensure the static potential of the circuit. The A0 pin is the address pin used to set the address of the device on the I2C bus. Different addresses can be selected by connecting to GND, SCL, SDA or VS. The A1 pin is also an address pin. Similar to the A0 pin, it is used to set the address of the device on the I2C bus. Different addresses can be selected by connecting to GND, SCL, SDA or VS.

[0067] It can be understood that the control component 2 also includes a second receiving end and a second output end. The second receiving end of the control component 2 is connected to the second output end of the detection component 1 to access the power supply voltage signal of the electronic device output by the voltage detection module. The control component 2 compares the voltage value corresponding to the power supply voltage signal with the under-voltage range, and outputs the corresponding under-voltage lockout control signal FAN_UVLO according to the comparison result. If it is in the under-voltage range, the second output end outputs the under-voltage lockout signal. If it is not in the under-voltage range, it outputs a signal with a level state different from the under-voltage lockout signal. After the under-voltage protection end of the driving component 3 receives the FAN_UVLO signal, the output end of the driving component 3 will output the corresponding PWM signal to control the fan to stop working or put the fan control circuit into a protection state, thereby realizing the under-voltage lockout function.

[0068] In an exemplary embodiment, the fan control circuit further includes a fifth switch tube Q5, a second resistor R2 and a third resistor R3, wherein:

[0069] The control end of the fifth switch tube Q5 is connected to the second output end of the control component 2, the first end of the fifth switch tube Q5 is connected to the undervoltage protection end of the driving component 3, the second end of the fifth switch tube Q5 is grounded, the first end of the second resistor R2 is grounded, the first end of the second resistor R2 is respectively connected to the first end of the third resistor R3 and the undervoltage protection end of the driving component 3, and the first end of the third resistor R3 is connected to the power supply.

[0070] In this embodiment, the fan control circuit further includes a fifth switch tube Q5, and the fifth switch tube Q5 can be a MOS tube. The control end of the fifth switch tube Q5 is connected to the second output end of the control component 2 so as to be turned on or off under the action of the undervoltage lockout control signal, thereby adjusting the signal connected to the undervoltage protection end of the driving component 3. Specifically, when the fifth switch tube Q5 is turned on under the undervoltage lockout signal, the voltage is divided by the second resistor R2 and the third resistor R3 to achieve the purpose of reducing the voltage, so that the voltage signal connected to the undervoltage protection end of the driving component 3 meets the judgment condition of the driving component 3, thereby realizing the undervoltage lockout function. The second resistor R2 and the third resistor R3 can be selected as fixed value resistors or adjustable resistors. The resistance values ​​of the second resistor R2 and the third resistor R3 can be set according to actual engineering needs, and this embodiment is not limited here.

[0071] In an exemplary embodiment, the driving assembly 3 further includes an overvoltage protection terminal;

[0072] The fan control circuit also includes a fourth resistor R4 and a fifth resistor R5, the first end of the fourth resistor R4 is connected to the power supply, the second end of the fourth resistor R4 is respectively connected to the first end of the fifth resistor R5 and the overvoltage protection end of the driving component 3, and the second end of the fifth resistor R5 is grounded.

[0073] In this embodiment, the driving component 3 also includes an overvoltage protection end, and the common end of the fourth resistor R4 and the fifth resistor R5 is connected to the overvoltage protection end. After the output voltage signal of the power supply is stepped down by the fourth resistor R4 and the fifth resistor R5 until it meets the judgment condition of the driving component 3, it is connected to the overvoltage protection end of the driving component 3 so that the driving component 3 performs an overvoltage protection operation.

[0074] In an exemplary embodiment, the fan control circuit further includes a second diode, a cathode of the second diode is connected to the first end of the fan, and an anode of the second diode and the second end of the fan are both grounded.

[0075] It can be understood that when the fan is rotating, if there is a sudden power outage, the fan will continue to rotate for a certain period of time due to inertia. At this time, the fan can be regarded as a generator to generate current. Based on this, the fan control circuit in this embodiment also includes a second diode connected to the fan. When the fan generates current, the unidirectional conduction function of the diode can bypass the current generated by the fan to the ground, thereby achieving the purpose of protecting the various components in the fan control circuit.

[0076] In an exemplary embodiment, the fan control circuit further includes a sixth switch tube Q6, a sixth resistor R6 and a seventh resistor R7, wherein:

[0077] The control end of the sixth switch tube Q6 and the first end of the sixth resistor R6 are both connected to the first output end of the control component 2, the second end of the sixth switch tube Q6 is grounded, the first end of the sixth switch tube Q6 is respectively connected to the second end of the sixth resistor R6 and the second end of the seventh resistor R7, and the second end of the seventh resistor R7 is connected to the power supply.

[0078] In this embodiment, the fan control circuit also includes a sixth switch tube Q6, a sixth resistor R6 and a seventh resistor R7. The sixth switch tube Q6 can be a MOS tube. The control end of the sixth switch tube Q6 and the first end of the sixth resistor R6 are connected to the first output end of the control component 2, and are both used to receive an enable control signal. The sixth switch tube Q6 is controlled by the enable control signal to perform a turn-on or turn-off operation, thereby adjusting the access level of the enable end of the driving component 3, so that the driving component 3 adjusts the PWM signal output by the output end according to the access level of the enable end.

[0079] As an optional embodiment, the driving component 3 may specifically include a PWM driving chip and its peripheral circuits, such as Figure 5 As shown, the enable end of the driving component 3 is the EN pin of the PWM driving chip, the output end of the driving component 3 is the GATE pin of the PWM driving chip, the undervoltage protection end of the driving component 3 is the UVLO pin of the PWM driving chip, and the overvoltage protection end of the driving component 3 is the OVP pin of the PWM driving chip. The PWM driving chip also includes a VIN pin, a GND pin, an OUT pin, an nPGD pin, a SENSE pin, a TIMER pin, etc., wherein the VIN pin is a chip power pin, providing the voltage required by the chip, the GND pin is a ground pin, used to connect the ground wire, the OUT pin is a signal output pin, the nPGD pin is used to indicate the output signal of the power supply good state, the SENSE pin is a current detection input pin, used to detect the current size and complete the cycle-by-cycle overcurrent protection function, and the TIMER pin is a timer pin, used to set the PWM frequency and PWM duty cycle. In this embodiment, the control component 2 can be implemented by FPGA (Field Programmable Gate Array).

[0080] In summary, the scheme of the present application is adopted to detect the current voltage and temperature in real time, and to control the PWM signal generated by the PWM driver chip through FPGA, so that the MOS tube produces different degrees of conduction, thereby controlling the start and stop of the fan, and changing the PWM signal voltage of the PWM driver chip to change the voltage of the MOS tube gate to achieve the fan speed regulation function. At the same time, the scheme of the present application also includes some protection mechanisms, such as undervoltage lockout and overvoltage protection functions, to ensure the stability and safety of the circuit. By adopting advanced pulse width modulation (PWM) technology, the fan speed can be accurately controlled, and the fan speed can be adjusted in real time according to the device temperature to ensure the heat dissipation effect while reducing noise and energy consumption. The fan speed is matched with the device temperature in real time, the heat dissipation efficiency is improved, the noise and energy consumption are reduced, and a more efficient, stable and energy-saving heat dissipation solution is provided for electronic equipment.

[0081] In a second aspect, the present application further provides an electronic device, including a fan and a fan control circuit connected to the fan as described in any one of the above embodiments.

[0082] For an introduction to an electronic device provided in the present application, please refer to the above-mentioned embodiments, and the present application will not go into details here.

[0083] The electronic device provided in the present application has the same beneficial effects as the above-mentioned fan control circuit.

[0084] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0085] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fan control circuit, characterized in that: include: The detection component comprises a first output terminal, wherein the first output terminal of the detection component is used to output a temperature signal of the electronic device; A control component, comprising a first receiving end and a first output end, wherein the first receiving end of the control component is connected to the first output end of the detection component, and the first output end of the control component is used to output an enable control signal corresponding to the temperature signal; A driving component, comprising an enable terminal and an output terminal, wherein the enable terminal of the driving component is connected to the first output terminal of the control component, and the output terminal of the driving component is used to output a current PWM signal corresponding to the enable control signal; The switch component connected to the fan includes at least one switch tube, at least one control end of the switch tube is connected to the output end of the drive component, and the switch tube is used to be turned on or off according to the current PWM signal to adjust the speed of the fan.

2. The fan control circuit according to claim 1, characterized in that: The switch assembly includes a first switch tube and a second switch tube, wherein: The first end of the first switch tube is connected to a power source, the second end of the first switch tube is connected to the second end of the second switch tube, the first end of the second switch tube is connected to the fan, and the control end of the first switch tube and the control end of the second switch tube are both connected to the output end of the driving component; The current flow direction of the body diode of the first switch tube is opposite to the current flow direction of the body diode of the second switch tube.

3. The fan control circuit according to claim 2, characterized in that: The switch assembly further includes a third switch tube and a fourth switch tube, wherein: The first end of the third switch tube is connected to the first end of the first switch tube, the second end of the third switch tube is respectively connected to the second end of the second switch tube and the second end of the fourth switch tube, and the first end of the fourth switch tube is connected to the fan; The current flow direction of the body diode of the third switch tube is the same as the current flow direction of the body diode of the first switch tube, and the current flow direction of the body diode of the fourth switch tube is the same as the current flow direction of the body diode of the second switch tube.

4. The fan control circuit according to claim 2, characterized in that: The fan control circuit further includes a transistor, a first diode, a first resistor and a first capacitor, wherein: The first end of the transistor is connected to the control end of the second switch tube, the second end of the transistor is respectively connected to the second end of the first switch tube and the anode of the first diode, the control end of the transistor is respectively connected to the cathode of the first diode, the first end of the first resistor and the first end of the first capacitor, and the second end of the first resistor and the second end of the first capacitor are both grounded.

5. The fan control circuit according to claim 1, characterized in that: The detection component further comprises a second output terminal, and the second output terminal of the detection component is used to output a power supply voltage signal of the electronic device; The control component further comprises a second receiving end and a second output end, the second receiving end of the control component is connected to the second output end of the detection component, and the second output end of the control component is used to output an undervoltage lockout control signal corresponding to the power supply voltage signal; The driving component also includes an undervoltage protection terminal, the undervoltage protection terminal of the driving component is connected to the second output terminal of the control component, and the output terminal of the driving component is used to output a current PWM signal corresponding to the undervoltage lockout control signal.

6. The fan control circuit according to claim 5, characterized in that: The fan control circuit further includes a fifth switch tube, a second resistor and a third resistor, wherein: The control end of the fifth switch tube is connected to the second output end of the control component, the first end of the fifth switch tube is connected to the undervoltage protection end of the driving component, the second end of the fifth switch tube is grounded, the first end of the second resistor is grounded, the first end of the second resistor is respectively connected to the first end of the third resistor and the undervoltage protection end of the driving component, and the first end of the third resistor is connected to the power supply.

7. The fan control circuit according to claim 1, characterized in that: The driving assembly also includes an overvoltage protection terminal; The fan control circuit also includes a fourth resistor and a fifth resistor, the first end of the fourth resistor is connected to the power supply, the second end of the fourth resistor is respectively connected to the first end of the fifth resistor and the overvoltage protection end of the driving component, and the second end of the fifth resistor is grounded.

8. The fan control circuit according to claim 1, characterized in that: The fan control circuit further includes a second diode, a cathode of the second diode is connected to the first end of the fan, and an anode of the second diode and the second end of the fan are both grounded.

9. The fan control circuit according to any one of claims 1 to 8, characterized in that: The fan control circuit further includes a sixth switch tube, a sixth resistor and a seventh resistor, wherein: The control end of the sixth switch tube and the first end of the sixth resistor are both connected to the first output end of the control component, the second end of the sixth switch tube is grounded, the first end of the sixth switch tube is respectively connected to the second end of the sixth resistor and the second end of the seventh resistor, and the second end of the seventh resistor is connected to the power supply.

10. An electronic device, characterized in that: The invention comprises a fan and a fan control circuit as described in any one of claims 1 to 9 connected to the fan.

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