Fan driving circuit and industrial control equipment

Abstract

The utility model discloses a fan driving circuit and industrial control equipment, the fan driving circuit comprises a rotating speed adjusting module and a fan driving module, the input end of the rotating speed adjusting module is connected with an input power supply, and the controlled end of the rotating speed adjusting module is connected with a control module; the rotating speed adjusting module is used for outputting a rotating speed adjusting signal according to the rotating speed driving signal output by the control module; the input end of the fan driving module is connected with the output end of the rotating speed adjusting module, the controlled end of the fan driving module is connected with the control module, and the output end of the fan driving module is connected with a fan; and the fan driving module is used for outputting a fan driving signal according to the rotating speed adjusting signal and the rotating speed driving signal so as to drive the fan to operate. The fan driving circuit solves the problems that the rotating speed of a fan cannot be adjusted and the service life of the fan is short under an existing fan driving circuit.

Description

Technical Field

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

[0002] For many high-power industrial control devices, using fans for active cooling is an efficient and low-cost method. Common fan types include voltage-controlled fans and PWM (Pulse Width Modulation) fans. Voltage fans use voltage signals to control their speed, while PWM fans use digital pulse-width modulation signals to control their speed. Due to their relative simplicity and low cost, voltage fans are widely used in industrial control equipment.

[0003] In the related art, under the control of the existing voltage fan driving circuit, the fan speed cannot be adjusted, and the fan is in a high-speed operation state for a long time, resulting in a short service life of the fan. Utility Model Content

[0004] The main purpose of this application is to provide a fan drive circuit and industrial control equipment, aiming to solve the problems of non-adjustable fan speed and short fan service life in existing fan drive circuits.

[0005] To achieve the above objectives, the present application provides a fan driving circuit, the fan driving circuit comprising:

[0006] A speed regulating module, wherein the input end of the speed regulating module is connected to the input power supply, and the controlled end of the speed regulating module is connected to the control module; the speed regulating module is configured to output a speed regulating signal according to the speed driving signal output by the control module;

[0007] A fan drive module, wherein the input end of the fan drive module is connected to the output end of the speed regulation module, the controlled end of the fan drive module is connected to the control module, and the output end of the fan drive module is connected to the fan; the fan drive module is used to output a fan drive signal according to the speed regulation signal and the speed drive signal to drive the fan to operate.

[0008] In one embodiment, the speed regulation module includes:

[0009] a first switch unit, wherein an input end of the first switch unit is connected to the input power supply, a controlled end of the first switch unit is connected to the control module, and the first switch unit is configured to output a switch control signal according to a speed drive signal output by the control module;

[0010] A speed switching unit, wherein the input end of the speed switching unit is connected to the input power supply, the controlled end of the speed switching unit is connected to the output end of the first switch unit, and the output end of the speed switching unit is connected to the input end of the fan drive module; the speed switching unit is used to output a speed adjustment signal according to the switch control signal.

[0011] In one embodiment, the output end of the first switch unit includes a first output end and a second output end, and the speed switching unit includes:

[0012] a feedback unit, wherein a controlled end of the feedback unit is connected to the first output end of the first switch unit, an input end of the feedback unit is connected to the second output end of the first switch unit, and an output end of the feedback unit is connected to the input end of the fan driving module; the feedback unit is configured to output a feedback signal according to the switch control signal;

[0013] A second switch unit, wherein the controlled end of the second switch unit is connected to the input end of the feedback unit and the second output end of the first switch unit, the input end of the second switch unit is connected to the input power supply, and the output end of the second switch unit is connected to the input end of the fan drive module and the output end of the feedback unit; the second switch unit is used to output a speed adjustment signal according to the feedback signal.

[0014] In one embodiment, the first switch unit includes a first voltage regulator tube and a first switch tube;

[0015] The controlled end of the first voltage regulator tube is connected to the control module, the first end of the first voltage regulator tube is connected to the input power supply and the controlled end of the feedback unit, and the second end of the first voltage regulator tube is grounded; the controlled end of the first switching tube is connected to the first end of the first voltage regulator tube, the first end of the first switching tube is connected to the input power supply, and the second end of the first switching tube is grounded.

[0016] In one embodiment, the first switch unit further includes a second voltage regulator tube;

[0017] The controlled end of the second voltage regulator tube is connected to the control module, the first end of the second voltage regulator tube is connected to the input end of the feedback unit and the controlled end of the second switch unit, and the second end of the second voltage regulator tube is grounded.

[0018] In one embodiment, the feedback unit includes a second switching tube and a third switching tube;

[0019] A controlled end of the second switching tube is connected to the input power supply and the first end of the first voltage regulator tube, a first end of the second switching tube is connected to the input end of the fan driving module and the output end of the second switching unit, and a second end of the second switching tube is connected to the first end of the second voltage regulator tube and the controlled end of the second switching unit; a controlled end of the third switching tube is connected to the input power supply and the first end of the first switching tube, a first end of the third switching tube is connected to the input end of the fan driving module and the output end of the second switching unit, and a second end of the third switching tube is connected to the first end of the second voltage regulator tube and the controlled end of the second switching unit.

[0020] In one embodiment, the feedback unit further includes a diode;

[0021] The first end of the diode is connected to the input end of the fan driving module and the output end of the second switch unit, and the second end of the diode is connected to the first end of the second switch tube and the first end of the third switch tube.

[0022] In one embodiment, the second switch unit includes a fourth switch tube;

[0023] The controlled end of the fourth switch tube is connected to the input power supply, the second end of the second switch tube, the second end of the third switch tube, and the first end of the second voltage regulator tube. The first end of the fourth switch tube is connected to the input power supply. The second end of the fourth switch tube is connected to the input end of the fan drive module and the first end of the diode.

[0024] In one embodiment, the fan driving module includes a fifth switching tube and a sixth switching tube;

[0025] The controlled end of the fifth switch tube is connected to the control module, the first end of the fifth switch tube is connected to the controlled end of the sixth switch tube, the second end of the fourth switch tube, the first end of the diode, and the first end of the sixth switch tube, and the second end of the fifth switch tube is grounded; the first end of the sixth switch tube is connected to the second end of the fourth switch tube and the first end of the diode, and the second end of the sixth switch tube is connected to the fan.

[0026] In addition, to achieve the above-mentioned purpose, the present application also provides an industrial control device, which includes the above-mentioned fan driving circuit.

[0027] The fan drive circuit provided by the present application includes a speed regulation module and a fan drive module, wherein the input end of the speed regulation module is connected to the input power supply, and the controlled end of the speed regulation module is connected to the control module; the speed regulation module is used to output a speed regulation signal according to the speed drive signal output by the control module; the input end of the fan drive module is connected to the output end of the speed regulation module, the controlled end of the fan drive module is connected to the control module, and the output end of the fan drive module is connected to the fan; the fan drive module is used to output a fan drive signal according to the speed regulation signal and the speed drive signal to drive the fan to operate. The speed regulation module of the present application can change the speed regulation signal based on the speed drive signal of the control module, and then change the fan drive signal output by the fan drive module, thereby changing the speed of the fan, thereby realizing adjustable fan speed, avoiding the fan from being in a high-speed operation state for a long time, and improving the service life of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 the structures shown in these drawings without paying any creative work.

[0029] Figure 1 A schematic structural diagram of an embodiment of a fan drive circuit provided in this application;

[0030] Figure 2 A schematic structural diagram of an embodiment of a fan drive circuit provided in this application;

[0031] Figure 3 A schematic structural diagram of an embodiment of a fan drive circuit provided in this application;

[0032] Figure 4 This is a structural diagram of an embodiment of a fan drive circuit provided in this application.

[0033] Description of Figure Numbers:

[0034] 100, fan drive circuit; 10, speed regulation module; 20, fan drive module; 30, input power supply; 40, control module; 50, fan; 11, first switch unit; 12, speed switching unit; 121, feedback unit; 122, second switch unit; U1~U2, first to second voltage regulator tubes; Q1~Q6, first to sixth switch tubes; D1, diode; R1~R13, first to thirteenth resistors; C1~C4, first to fourth capacitors; FAN_CTRL, speed drive signal; FAN_REGL, speed regulation signal; PWR_FAN, fan drive signal; SWITCH_CONTROL, switch control signal; FEEDBACK, feedback signal; V0_FAN, output voltage of input power supply.

[0035] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0037] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, in the embodiments of the present application, descriptions such as "first" and "second" are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the embodiments of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the embodiments of the present application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection between two elements or the interaction between two elements, unless otherwise specified. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present application.

[0041] In order to better understand the above technical solution, the above technical solution is described in detail below with reference to the accompanying drawings.

[0042] Currently, many high-power industrial control devices often use fans for active cooling. Common fan types include voltage-controlled fans and PWM (Pulse Width Modulation) fans. Voltage fans use voltage signals to control their speed, while PWM fans use digital pulse-width modulation signals to control their speed. Due to their relative simplicity and low cost, voltage fans are widely used in industrial control equipment.

[0043] In the related art, the driving circuit of the existing voltage fan usually uses a constant voltage for driving control, the fan speed is not adjustable, and the fan is in a high-speed operation state for a long time, resulting in a short service life of the fan.

[0044] In view of this, in order to solve the problems of non-adjustable fan speed and short fan service life in existing fan driving circuits, the present application provides a fan driving circuit and industrial control equipment.

[0045] In one embodiment of the present application, Figure 1As shown, the present application provides a fan driving circuit 100, which includes a speed regulation module 10 and a fan driving module 20. The input end of the speed regulation module 10 is connected to the input power supply 30, and the controlled end of the speed regulation module 10 is connected to the control module 40; the speed regulation module 10 is used to output a speed regulation signal FAN_REGL according to the speed driving signal FAN_CTRL output by the control module 40; the input end of the fan driving module 20 is connected to the output end of the speed regulation module 10, the controlled end of the fan driving module 20 is connected to the control module 40, and the output end of the fan driving module 20 is connected to the fan 50; the fan driving module 20 is used to output a fan driving signal PWR_FAN according to the speed regulation signal FAN_REGL and the speed driving signal FAN_CTRL to drive the fan 50 to operate.

[0046] In this embodiment, the speed regulation module 10 is a circuit for adjusting the fan speed, the control module 40 is a circuit or chip with a control function, such as a CPU, MCU or FPGA, the fan drive module 20 is a circuit for driving the fan to operate, the input power supply 30 is a power supply, the speed drive signal FAN_CTRL is a level signal or voltage signal output by the control module 40 for speed regulation control, the speed regulation signal FAN_REGL is a voltage signal or level signal output by the speed regulation module 10, and the fan drive signal PWR_FAN is a voltage signal or level signal output by the fan drive module 20 for controlling the operation of the fan 50.

[0047] Specifically, when it is necessary to adjust the speed of the fan 50, for example, when the device temperature rises and the speed of the fan 50 needs to be increased or when the device temperature drops and the speed of the fan 50 needs to be reduced, the control module 40 can output a speed drive signal FAN_CTRL to the speed adjustment module 10, and the speed adjustment module 10 outputs a speed adjustment signal FAN_REGL to the fan drive module 20 according to the speed drive signal FAN_CTRL, and the fan drive module 20 outputs a fan drive signal PWR_FAN to the fan 50 according to the speed adjustment signal FAN_REGL, thereby driving the fan 50 to operate.

[0048] According to the technical solution provided in this embodiment, the speed regulating module 10 can change the speed regulating signal FAN_REGL based on the speed driving signal FAN_CTRL of the control module 40, and further change the fan driving signal PWR_FAN output by the fan driving module 20, thereby changing the speed of the fan 50, thereby achieving adjustable speed of the fan 50, avoiding the fan 50 from being in a high-speed operation state for a long time, and improving the service life of the fan 50.

[0049] In one embodiment of the present application, Figure 2As shown, the speed regulation module 10 of the fan driving circuit 100 includes a first switch unit 11 and a speed switching unit 12. The input end of the first switch unit 11 is connected to the input power supply 30, and the controlled end of the first switch unit 11 is connected to the control module 40. The first switch unit 11 is used to output a switch control signal SWITCH_CONTROL according to the speed driving signal FAN_CTRL output by the control module 40; the input end of the speed switching unit 12 is connected to the input power supply 30, the controlled end of the speed switching unit 12 is connected to the output end of the first switch unit 11, and the output end of the speed switching unit 12 is connected to the input end of the fan driving module 20; the speed switching unit 12 is used to output a speed regulation signal FAN_REGL according to the switch control signal SWITCH_CONTROL.

[0050] In this embodiment, the first switch unit 11 is a circuit with a switching function, the speed switching unit 12 is a circuit for switching the speed, and the switch control signal SWITCH_CONTROL is a voltage signal or a level signal output by the first switch unit 11 to the speed switching unit 12 .

[0051] Specifically, when it is necessary to adjust the speed of the fan 50, for example, when the temperature of the device rises and the speed of the fan 50 needs to be increased or when the temperature of the device drops and the speed of the fan 50 needs to be reduced, the control module 40 can output the speed drive signal FAN_CTRL to the first switch unit 11 as needed, and the first switch unit 11 outputs the switch control signal SWITCH_CONTROL to the speed switching unit 12 according to the speed drive signal FAN_CTRL, and the speed switching unit 12 outputs the speed adjustment signal FAN_REGL according to the switch control signal SWITCH_CONTROL, and the fan drive module 20 outputs the fan drive signal PWR_FAN to the fan 50 according to the speed adjustment signal FAN_REGL, thereby driving the fan 50 to operate.

[0052] The technical solution provided in this embodiment realizes the output of the speed adjustment signal FAN_REGL through the first switching unit 11 and the speed switching unit 12, thereby changing the fan drive signal PWR_FAN output by the fan drive module 20, thereby changing the speed of the fan 50, realizing the adjustable speed of the fan 50, avoiding the fan 50 from being in a high-speed operation state for a long time, and improving the service life of the fan.

[0053] In one embodiment of the present application, Figure 3As shown, the output end of the first switch unit 11 includes a first output end and a second output end, and the speed switching unit 12 includes a feedback unit 121 and a second switch unit 122. The controlled end of the feedback unit 121 is connected to the first output end of the first switch unit 11, the input end of the feedback unit 121 is connected to the second output end of the first switch unit 11, and the output end of the feedback unit 121 is connected to the input end of the fan driving module 20; the feedback unit 121 is used to output a feedback signal FEEDBACK according to the switch control signal SWITCH_CONTROL; the controlled end of the second switch unit 122 is connected to the input end of the feedback unit 121 and the second output end of the first switch unit 11, the input end of the second switch unit 122 is connected to the input power supply 30, and the output end of the second switch unit 122 is connected to the input end of the fan driving module 20 and the output end of the feedback unit 121; the second switch unit 122 is used to output a speed adjustment signal FAN_REGL according to the feedback signal FEEDBACK.

[0054] In this embodiment, the second switch unit 122 is a circuit with a switch function, and the feedback unit 121 is a circuit for providing a feedback signal FEEDBACK to the second switch unit 122 . The feedback signal FEEDBACK is a voltage signal or a level signal output by the feedback unit 121 .

[0055] Specifically, when it is necessary to adjust the speed of the fan 50, for example, when the temperature of the device rises and the speed of the fan 50 needs to be increased, or when the temperature of the device drops and the speed of the fan 50 needs to be reduced, the control module 40 can output the speed drive signal FAN_CTRL to the first switch unit 11 as needed, and the first switch unit 11 outputs the switch control signal SWITCH_CONTROL to the feedback unit 121 according to the speed drive signal FAN_CTRL, and the feedback unit 121 outputs the feedback signal FEEDBACK according to the switch control signal SWITCH_CONTROL, and the second switch unit 122 outputs the speed adjustment signal FAN_REGL according to the feedback signal FEEDBACK, and the fan drive module 20 outputs the fan drive signal PWR_FAN to the fan 50 according to the speed adjustment signal FAN_REGL, thereby driving the fan 50 to operate.

[0056] The technical solution provided in this embodiment, on the one hand, can achieve accurate and reliable output of the speed adjustment signal FAN_REGL through the setting of the feedback unit 121 and the second switch unit 122, thereby changing the fan drive signal PWR_FAN output by the fan drive module 20, thereby changing the speed of the fan 50, realizing adjustable speed of the fan 50, avoiding the fan 50 from being in a high-speed operation state for a long time, and improving the service life of the fan; on the other hand, the feedback signal FEEDBACK output by the feedback unit 121 can ensure the stable opening and conduction of the second switch unit 122, thereby improving the stability and reliability of the output of the speed adjustment signal FAN_REGL, thereby ensuring stable and reliable speed adjustment of the fan 50.

[0057] In one embodiment of the present application, Figure 4 As shown, the first switch unit 11 includes a first voltage regulator tube U1, a second voltage regulator tube U2 and a first switch tube Q1; the controlled end of the first voltage regulator tube U1 is connected to the control module 40, the first end of the first voltage regulator tube U1 is connected to the input power supply 30 and the controlled end of the feedback unit 121, and the second end of the first voltage regulator tube U1 is grounded; the controlled end of the first switch tube Q1 is connected to the first end of the first voltage regulator tube U1, the first end of the first switch tube Q1 is connected to the input power supply 30, and the second end of the first switch tube Q1 is grounded; the controlled end of the second voltage regulator tube U2 is connected to the control module 40, the first end of the second voltage regulator tube U2 is connected to the input end of the feedback unit 121 and the controlled end of the second switch unit 122, and the second end of the second voltage regulator tube U2 is grounded.

[0058] In this embodiment, the first voltage regulator tube U1 and the second voltage regulator tube U2 are electronic devices with switching and voltage stabilization functions, such as TL431 controllable precision voltage regulator; the first switch tube Q1 is an electronic device with switching function, such as a MOS tube or a transistor.

[0059] Specifically, when it is necessary to adjust the speed of the fan 50, for example, when the device temperature rises and the speed of the fan 50 needs to be increased or when the device temperature drops and the speed of the fan 50 needs to be reduced, the control module 40 can output a speed drive signal FAN_CTRL to the first voltage regulator U1 and the second voltage regulator U2 as needed. The first voltage regulator U1 is turned on or off according to the speed drive signal FAN_CTRL, and the first switch tube Q1 is turned on or off under the action of the first voltage regulator U1 and the input power supply 30. The second voltage regulator U2 is also turned on or off according to the speed drive signal FAN_CTRL, and then outputs a switch control signal SWITCH_CONTROL to the feedback unit 121 as needed to adjust and control the speed of the fan 50.

[0060] The technical solution provided in this embodiment, comprising a first switching unit composed of a first voltage-stabilizing tube U1, a second voltage-stabilizing tube U2 and a first switching tube Q1, ensures stable and reliable output of the switch control signal SWITCH_CONTROL, thereby ensuring reliable and stable adjustment of the rotational speed of the fan 50 and improving the service life of the fan 50.

[0061] In one embodiment of the present application, Figure 4 As shown, the feedback unit 121 includes a second switch tube Q2, a third switch tube Q3, and a diode D1; a controlled end of the second switch tube Q2 is connected to the input power supply 30 and the first end of the first voltage regulator tube U1, a first end of the second switch tube Q2 is connected to the input end of the fan driving module 20 and the output end of the second switch unit 122, and a second end of the second switch tube Q2 is connected to the first end of the second voltage regulator tube U2; a controlled end of the third switch tube Q3 is connected to the input power supply 30 and the first end of the first switch tube Q1, a first end of the third switch tube Q3 is connected to the input end of the fan driving module 20 and the output end of the second switch unit 122, and a second end of the third switch tube Q3 is connected to the first end of the second voltage regulator tube; a first end of the diode D1 is connected to the input end of the fan driving module 20 and the output end of the second switch unit 122, and a second end of the diode D2 is connected to the first end of the second switch tube Q2 and the first end of the third switch tube Q3.

[0062] In this embodiment, the second switch tube Q2 and the third switch tube Q3 are electronic devices with a switching function, such as MOS tubes or triodes.

[0063] Specifically, when it is necessary to adjust the speed of the fan 50, for example, when the device temperature rises and the speed of the fan 50 needs to be increased or when the device temperature drops and the speed of the fan 50 needs to be reduced, the control module 40 can output a speed drive signal FAN_CTRL to the first voltage regulator U1 and the second voltage regulator U2 as needed. The first voltage regulator U1 is turned on or off according to the speed drive signal FAN_CTRL, and the first switch tube Q1 is turned on or off under the drive of the first voltage regulator U1. The second voltage regulator U2 is also turned on or off according to the speed drive signal FAN_CTRL, thereby driving the second switch tube Q2 and the third switch tube Q3 to be turned on or off, so that the feedback unit 121 outputs the feedback signal FEEDBACK, thereby realizing adjustment and control of the speed of the fan 50.

[0064] The technical solution provided in this embodiment, comprising a feedback unit 121 composed of a second switch tube Q2, a third switch tube Q3, and a diode D1, ensures stable and reliable output of the feedback signal FEEDBACK, thereby ensuring stable on-state conduction of the second switch unit 122, ensuring reliable and stable adjustment of the rotational speed of the fan 50, and improving the service life of the fan 50.

[0065] In one embodiment of the present application, Figure 4 As shown, the second switch unit 122 includes a fourth switch tube Q4; a controlled end of the fourth switch tube Q4 is connected to the input power supply 30, the second end of the second switch tube Q2, the second end of the third switch tube Q3, and the first end of the second voltage regulator tube U2; a first end of the fourth switch tube Q4 is connected to the input power supply 30, and a second end of the fourth switch tube Q4 is connected to the input end of the fan drive module 20 and the first end of the diode D1.

[0066] In this embodiment, the fourth switch tube Q4 is an electronic device with a switching function, such as a MOS tube or a triode.

[0067] Specifically, when the speed of the fan 50 needs to be adjusted, for example, when the device temperature rises and the speed of the fan 50 needs to be increased, or when the device temperature drops and the speed of the fan 50 needs to be reduced, the control module 40 can output a speed drive signal FAN_CTRL to the first voltage regulator U1 and the second voltage regulator U2 as needed. The first voltage regulator U1 is turned on or off according to the speed drive signal FAN_CTRL, and the first switch tube Q1 is turned on or off under the drive of the first voltage regulator U1. The second voltage regulator U2 is also turned on or off according to the speed drive signal FAN_CTRL, thereby driving the second switch tube Q2 and the third switch tube Q3 to be turned on or off, so that the feedback unit 121 outputs the feedback signal FEEDBACK. Under the action of the feedback signal FEEDBACK, the fourth switch tube Q4 can be stably turned on and output the speed adjustment signal FAN_REGL, thereby achieving adjustment and control of the speed of the fan 50.

[0068] The technical solution provided in this embodiment can ensure stable and reliable output of the speed adjustment signal FAN_REGL by forming the second switch unit with the fourth switch tube Q4, thereby ensuring reliable and stable adjustment of the speed of the fan 50 and improving the service life of the fan 50.

[0069] In one embodiment of the present application, Figure 4 As shown, the fan drive module 20 includes a fifth switch tube Q5 and a sixth switch tube Q6; a controlled end of the fifth switch tube Q5 is connected to the control module 40, a first end of the fifth switch tube Q5 is connected to the controlled end of the sixth switch tube Q6, a second end of the fourth switch tube Q4, a first end of the diode D1, and a first end of the sixth switch tube Q6, and a second end of the fifth switch tube Q5 is grounded; a first end of the sixth switch tube Q6 is connected to the second end of the fourth switch tube Q4 and the first end of the diode D1, and a second end of the sixth switch tube Q6 is connected to the fan 50.

[0070] In this embodiment, the fifth switch tube Q5 and the sixth switch tube Q6 are electronic devices with a switching function, such as MOS tubes or triodes.

[0071] Specifically, when the speed of the fan 50 needs to be adjusted, for example, when the temperature of the device rises and the speed of the fan 50 needs to be increased or when the temperature of the device drops and the speed of the fan 50 needs to be reduced, the control module 40 can output a speed drive signal FAN_CTRL to the first voltage regulator U1 and the second voltage regulator U2 as needed. The first voltage regulator U1 is turned on or off according to the speed drive signal FAN_CTRL, and the first switch tube Q1 is turned on or off under the drive of the first voltage regulator U1. The second voltage regulator U2 is also turned on or off according to the speed drive signal FAN_CTRL, thereby driving the second switch tube Q2 and the third switch tube Q3. The feedback unit 121 outputs the feedback signal FEEDBACK by turning on or off the switch Q3. Under the action of the feedback signal FEEDBACK, the fourth switch Q4 can be stably turned on and output the speed adjustment signal FAN_REGL. At the same time, the fifth switch Q5 is turned on or off according to the speed drive signal FAN_CTRL output by the control module 40, thereby driving the sixth switch Q6 to be turned on or off. As a result, the sixth switch Q6 outputs the fan drive signal PWR_FAN according to the speed adjustment signal FAN_REGL, thereby adjusting and controlling the speed of the fan 50.

[0072] In the technical solution provided by this embodiment, the fan driving module 20 composed of the fifth switch tube Q5 and the sixth switch tube Q6 ensures reliable and stable output of the fan driving signal PWR_FAN, thereby increasing the service life of the fan 50.

[0073] In one embodiment of the present application, Figure 4As shown, the fan driving circuit 100 further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; a first end of the first resistor R1, the second resistor R2 and the third resistor R3 is connected to the control module 40, a second end of the first resistor R1 is connected to the fifth switch The first end of the fourth resistor R4 and the fifth resistor R5 are connected to the controlled end of the second voltage regulator tube U2 and the second end of the third resistor R3, and the second end of the fourth resistor R4 and the fifth resistor R5 are grounded; the first end of the sixth resistor R6 and the seventh resistor R7 are connected to the input power supply 30, the second end of the sixth resistor R6 is connected to the first end of the first switch tube Q1 and the controlled end of the third switch tube Q3, and the seventh resistor R The second end of the eighth resistor R8 is connected to the first end of the first voltage-stabilizing tube U1, the second end of the seventh resistor R7, and the controlled end of the second switching tube Q3. The second end of the eighth resistor R8 is connected to the controlled end of the first switching tube Q1 and the first end of the ninth resistor R9. The second end of the ninth resistor R9 is grounded. The first ends of the tenth resistor R10 and the eleventh resistor R11 are connected to the second end of the diode D1. The second end of the tenth resistor R10 is connected to the first end of the second switching tube Q2. The second end of the eleventh resistor R11 is connected to the first end of the second switching tube Q2. A second end of the resistor R11 is connected to a first end of the third switch tube Q3; a first end of the twelfth resistor is connected to the input power supply 30 and a first end of the fourth switch tube Q4, and a second end of the twelfth resistor is connected to a first end of the second voltage regulator tube U1, a second end of the second switch tube Q2, a second end of the third switch tube Q3, and a controlled end of the fourth switch tube Q4; a first end of the thirteenth resistor R13 is connected to a second end of the fourth switch tube Q4 and a first end of the sixth switch tube Q6, and a second end of the thirteenth resistor R13 is connected to a first end of the fifth switch tube Q5 and a controlled end of the sixth switch tube Q6.

[0074] A first end of the first capacitor C1 is connected to the second end of the third resistor R3, the first end of the fourth resistor R4, the first end of the fifth resistor R5, and the controlled end of the second voltage-stabilizing tube U2, and the second end of the first capacitor C1 is grounded; a first end of the second capacitor C2 is connected to the second end of the second resistor R2 and the controlled end of the first voltage-stabilizing tube U1, and the second end of the second capacitor C2 is grounded; a first end of the third capacitor C3 is connected to the second end of the first resistor R1 and the controlled end of the fifth switch tube Q5, and the second end of the third capacitor C3 is grounded; a first end of the fourth capacitor C4 is connected to the fan 50 and the second end of the sixth switch tube Q6, and the second end of the fourth capacitor C4 is grounded.

[0075] In this embodiment, the values ​​of the resistor and capacitor can be selected according to actual conditions, and this embodiment does not limit this.

[0076] In the technical solution provided by this embodiment, the arrangement of the resistor and capacitor components ensures that the fan drive circuit can operate normally, the speed of the fan 50 can be adjusted, and the service life of the fan 50 is increased.

[0077] In one embodiment of the present application, Figure 4 As shown, the first and second voltage regulator diodes U1 and U2 are TL431 controllable precision voltage regulators, and the first, second, third, fourth, fifth, and sixth switches Q1, Q2, Q3, Q4, Q5, and Q6 are MOS transistors. V0_FAN is the output voltage of the input power supply 30. The speed drive signal FAN_CTRL is used to adjust the fan 50's speed in four gears. If more gears are required, additional designs can be added based on this circuit.

[0078] Specifically, when the speed drive signal FAN_CTRL output by the control module 40 is greater than the first voltage value V1, the second voltage regulator U2 is turned on, driving the fourth switch tube Q4 to be turned on. At the same time, the fifth switch tube Q5 is turned on, driving the sixth switch tube Q6 to be turned on. At this time, the output voltage value of the fan drive signal PWR_FAN is approximately equal to the output voltage V0_FAN of the input power supply 30. The fan 50 runs under the drive of the voltage V0_FAN, that is, when FAN_CTRL>V1, PWR_FAN=V0_FAN, and the speed of the fan 50 is S1.

[0079] When the speed drive signal FAN_CTRL output by the control module 40 is less than the first voltage value V1 and greater than the second voltage value V2, the second voltage regulator U2 is turned off and the first voltage regulator U1 is turned on, driving the first switch Q1 to turn off, the third switch Q3 to turn off, and the second switch Q2 to turn on. At this time, the G-pole voltage of the fourth switch Q4 depends on the conduction voltage drop of the second switch Q2, the tenth resistor R10, the diode D1, and the conduction threshold of the fourth switch Q4. The output voltage V0_FAN of the input power supply 30 reaches the D-pole of the fourth switch Q4 through the twelfth resistor R12, the second switch Q2, the tenth resistor R10, and the diode D1, forming a negative feedback link. The conduction voltage V GS The negative feedback link of the D-pole of the fourth switch tube Q4 will be stabilized at the turn-on threshold, thereby remaining in the amplification region. At the same time, the fifth switch tube Q5 is turned on, driving the sixth switch tube Q6 to turn on. At this time, the fan drive signal PWR_FAN = V0_FAN-V GSQ4 *(R10+R12) / R12-V D1 , the fan 50 is driven by the voltage PWR_FAN, that is, when V1>FAN_CTRL>V2, PWR_FAN=V0_FAN-V GSQ4 *(R10+R12) / R12-V D1 , fan speed S2.

[0080] When the FAN_CTRL signal output by the control module 40 is less than the second voltage value V2 and greater than the third voltage value V3, the second voltage regulator U2 is turned off, the first voltage regulator U1 is turned on, driving the first switch Q1 to turn on, the third switch Q3 to turn on, and the second switch Q2 to turn off. At this time, the G-pole voltage of the fourth switch Q4 depends on the conduction voltage drop of the third switch Q3, the eleventh resistor R11, and the diode D1, as well as the conduction threshold of the fourth switch Q4. The output voltage V0_FAN of the input power supply 30 reaches the D-pole of the fourth switch Q4 through the twelfth resistor R12, the third switch Q3, the eleventh resistor R11, and the diode D1, forming a negative feedback link. The conduction voltage V GS The negative feedback link of the D-pole of the fourth switch tube Q4 will be stabilized at the turn-on threshold, thereby remaining in the amplification region. At the same time, the fifth switch tube Q5 is turned on, driving the sixth switch tube Q6 to turn on. At this time, the fan drive signal PWR_FAN = V0_FAN-V GSQ4 *(R11+R12) / R12-V D1 , the fan 50 is driven by the voltage PWR_FAN, that is, when V2>FAN_CTRL>V3, PWR_FAN=V0_FAN-V GSQ4 *(R11+R12) / R12-V D1 , fan speed S3.

[0081] When the FAN_CTRL signal output by the control module 40 is less than the fourth voltage V4, both the first voltage regulator U1 and the second voltage regulator U2 are turned off, thereby driving the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fourth switch tube Q4 to turn off. At the same time, the fifth switch tube Q5 conducts, driving the sixth switch tube Q6 to conduct. At this time, the voltage of the fan drive signal PWR_FAN is 0V, and the fan 50 operates under the drive of the 0V voltage. That is, when FAN_CTRL < V4, PWR_FAN = 0V, and the fan speed is S4.

[0082] In the technical solution provided by this embodiment, four-speed adjustment of the fan 50 is achieved, and it can be driven by a single signal. The circuit is simple and the cost is low, effectively improving the service life of the fan 50.

[0083] This application also provides an industrial control device. The industrial control device includes the fan drive circuit 100 in any of the above embodiments. The specific structure of the fan drive circuit 100 refers to the above embodiments. Since the industrial control device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0084] The corresponding technical features in the above embodiments can be used mutually on the premise that they do not cause contradictions or unfeasibility in the solutions.

[0085] It should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitations, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including that element.

[0086] The serial numbers of the embodiments of the present application above are only for description and do not represent the advantages or disadvantages of the embodiments.

[0087] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0088] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are protected by this application.

Claims

1. A fan driving circuit, characterized in that: The fan driving circuit includes: A speed regulating module, wherein the input end of the speed regulating module is connected to the input power supply, and the controlled end of the speed regulating module is connected to the control module; the speed regulating module is configured to output a speed regulating signal according to the speed driving signal output by the control module; A fan drive module, wherein the input end of the fan drive module is connected to the output end of the speed regulation module, the controlled end of the fan drive module is connected to the control module, and the output end of the fan drive module is connected to the fan; the fan drive module is used to output a fan drive signal according to the speed regulation signal and the speed drive signal to drive the fan to operate.

2. The fan driving circuit according to claim 1, wherein: The speed regulation module includes: a first switch unit, wherein an input end of the first switch unit is connected to the input power supply, a controlled end of the first switch unit is connected to the control module, and the first switch unit is configured to output a switch control signal according to a speed drive signal output by the control module; A speed switching unit, wherein the input end of the speed switching unit is connected to the input power supply, the controlled end of the speed switching unit is connected to the output end of the first switch unit, and the output end of the speed switching unit is connected to the input end of the fan drive module; the speed switching unit is used to output a speed adjustment signal according to the switch control signal.

3. The fan driving circuit according to claim 2, wherein: The output end of the first switch unit includes a first output end and a second output end, and the speed switching unit includes: a feedback unit, wherein a controlled end of the feedback unit is connected to the first output end of the first switch unit, an input end of the feedback unit is connected to the second output end of the first switch unit, and an output end of the feedback unit is connected to the input end of the fan driving module; the feedback unit is configured to output a feedback signal according to the switch control signal; A second switch unit, wherein the controlled end of the second switch unit is connected to the input end of the feedback unit and the second output end of the first switch unit, the input end of the second switch unit is connected to the input power supply, and the output end of the second switch unit is connected to the input end of the fan drive module and the output end of the feedback unit; the second switch unit is used to output a speed adjustment signal according to the feedback signal.

4. The fan driving circuit according to claim 3, wherein: The first switch unit includes a first voltage regulator tube and a first switch tube; The controlled end of the first voltage regulator tube is connected to the control module, the first end of the first voltage regulator tube is connected to the input power supply and the controlled end of the feedback unit, and the second end of the first voltage regulator tube is grounded; the controlled end of the first switching tube is connected to the first end of the first voltage regulator tube, the first end of the first switching tube is connected to the input power supply, and the second end of the first switching tube is grounded.

5. The fan driving circuit according to claim 4, wherein: The first switch unit further includes a second voltage regulator tube; The controlled end of the second voltage regulator tube is connected to the control module, the first end of the second voltage regulator tube is connected to the input end of the feedback unit and the controlled end of the second switch unit, and the second end of the second voltage regulator tube is grounded.

6. The fan driving circuit according to claim 5, wherein: The feedback unit includes a second switching tube and a third switching tube; A controlled end of the second switching tube is connected to the input power supply and the first end of the first voltage regulator tube, a first end of the second switching tube is connected to the input end of the fan driving module and the output end of the second switching unit, and a second end of the second switching tube is connected to the first end of the second voltage regulator tube and the controlled end of the second switching unit; a controlled end of the third switching tube is connected to the input power supply and the first end of the first switching tube, a first end of the third switching tube is connected to the input end of the fan driving module and the output end of the second switching unit, and a second end of the third switching tube is connected to the first end of the second voltage regulator tube and the controlled end of the second switching unit.

7. The fan driving circuit according to claim 6, wherein: The feedback unit further includes a diode; The first end of the diode is connected to the input end of the fan driving module and the output end of the second switch unit, and the second end of the diode is connected to the first end of the second switch tube and the first end of the third switch tube.

8. The fan driving circuit according to claim 7, wherein: The second switch unit includes a fourth switch tube; The controlled end of the fourth switch tube is connected to the input power supply, the second end of the second switch tube, the second end of the third switch tube, and the first end of the second voltage regulator tube. The first end of the fourth switch tube is connected to the input power supply. The second end of the fourth switch tube is connected to the input end of the fan drive module and the first end of the diode.

9. The fan driving circuit according to claim 8, wherein: The fan driving module includes a fifth switch tube and a sixth switch tube; The controlled end of the fifth switch tube is connected to the control module, the first end of the fifth switch tube is connected to the controlled end of the sixth switch tube, the second end of the fourth switch tube, the first end of the diode, and the first end of the sixth switch tube, and the second end of the fifth switch tube is grounded; the first end of the sixth switch tube is connected to the second end of the fourth switch tube and the first end of the diode, and the second end of the sixth switch tube is connected to the fan.

10. An industrial control device, characterized in that: The industrial control device includes the fan driving circuit according to any one of claims 1 to 9.

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