CN113931865A - Fan control circuit and temperature adjusting device - Google Patents
Fan control circuit and temperature adjusting device Download PDFInfo
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- CN113931865A CN113931865A CN202111220828.4A CN202111220828A CN113931865A CN 113931865 A CN113931865 A CN 113931865A CN 202111220828 A CN202111220828 A CN 202111220828A CN 113931865 A CN113931865 A CN 113931865A
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- 239000003990 capacitor Substances 0.000 claims description 64
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
Abstract
The application provides a fan control circuit and a temperature adjusting device; the fan control circuit comprises a control unit, a first driving unit, a second driving unit and an output unit, wherein the control unit is provided with a first output end electrically connected with the first driving unit and a second output end electrically connected with the second driving unit, the first driving unit and the second driving unit are both electrically connected with a fan through the output unit, the first driving unit drives the fan to rotate at a first rotating speed, and the second driving unit drives the fan to rotate at a second rotating speed. This application utilizes first driven unit and second drive unit to drive the fan operation respectively through setting up first drive unit and the second drive unit of two output difference electric connection with the control unit, has realized the regulation of fan rotational speed, promotes the flexibility of fan operation and the flexibility that adjusts the temperature.
Description
Technical Field
The application relates to the technical field of temperature control, in particular to a fan control circuit and a temperature adjusting device.
Background
With the increase of functions and processing capacity of an In-Vehicle entertainment system, the internal temperature of an In-Vehicle entertainment equipment (IVI) controller is higher and higher during operation, and the setting of a fan on the IVI controller to adjust the temperature is inevitable. The fan control circuit is inevitably used by adding the fan. At present, cooling fans used in IVI and other controllers are all direct current fans, and therefore, the voltage provided by the fan control circuit directly determines the rotation speed and the cooling capacity of the fans. However, the conventional fan control circuit is affected by the circuit structure thereof and can only provide one driving voltage, so that the fan can only work at a single rotation speed, which causes the lack of flexibility in temperature regulation of the IVI controller, for example, when the temperature of the IVI controller is not very high, the fan keeps a high rotation speed to operate, thereby causing the problems of high energy consumption and high noise; or when the temperature of the IVI controller is higher, the fan keeps running at a lower rotating speed, so that abnormal cooling is caused, and the damage of the IVI controller is caused.
Therefore, the current fan temperature adjusting system has the technical problem of poor temperature adjusting and controlling flexibility.
Disclosure of Invention
The application provides a fan control circuit and attemperator for alleviate the poor technical problem of regulation and control temperature flexibility that present fan attemperator system exists.
The application provides a fan control circuit, it includes:
a control unit including a first output terminal and a second output terminal;
the control end of the first driving unit is electrically connected with the first output end;
the control end of the second driving unit is electrically connected with the second output end; and
the output unit is electrically connected with the first drive unit and the second drive unit, the first drive unit is electrically connected with the first fan through the output unit, the first drive unit drives the first fan to rotate at a first rotating speed, the second drive unit is electrically connected with the first fan through the output unit, and the second drive unit drives the first fan to rotate at a second rotating speed.
In the fan control circuit of the present application, the first driving unit includes a first transistor and a first zener diode;
the first end of the first transistor is electrically connected with the first output end, the second end of the first transistor and the first end of the first voltage stabilizing diode are both electrically connected to the first fan through the output unit, and the third end of the first transistor and the second end of the first voltage stabilizing diode are both grounded.
In the fan control circuit of the present application, the second driving unit includes a second transistor and a second zener diode;
the first end of the second transistor is electrically connected with the second output end, the second end of the second transistor is electrically connected with the second end of the second voltage stabilizing diode, the first end of the second voltage stabilizing diode is electrically connected to the first fan through the output unit, and the third end of the second transistor is grounded.
In the fan control circuit of the present application, the regulated voltage of the second regulator diode is smaller than the regulated voltage of the first regulator diode.
In the fan control circuit of the present application, the output unit includes a third transistor and a fourth transistor;
a first end of the third transistor is electrically connected with a second end of the first transistor, a second end of the third transistor is electrically connected with a power supply, and a third end of the third transistor is electrically connected with a first end of the fourth transistor;
a second end of the fourth transistor is electrically connected with the power supply, and a third end of the fourth transistor is electrically connected with the first fan;
the first end of the first voltage stabilizing diode and the first end of the second voltage stabilizing diode are both electrically connected with the first end of the fourth transistor.
In the fan control circuit of the present application, the fan control circuit further includes a first capacitor and a second capacitor;
one end of the first capacitor is electrically connected with the third end of the fourth transistor, and the other end of the first capacitor is grounded;
one end of the second capacitor is electrically connected with the third end of the fourth transistor, and the other end of the second capacitor is grounded.
In the fan control circuit of the present application, a first resistor is connected in series between the first terminal of the first transistor and the first input terminal, and a second resistor is connected in series between the first terminal of the first transistor and the third terminal of the first transistor.
In the fan control circuit of the present application, a third resistor is connected in series between the first end of the second transistor and the second input terminal, and a fourth resistor is connected in series between the first end of the second transistor and the third end of the second transistor.
In the fan control circuit of the present application, a fifth resistor is connected in series between the second terminal of the first transistor and the first terminal of the third transistor, a sixth resistor is connected in series between the second terminal of the third transistor and the first terminal of the third transistor, and a seventh resistor is connected in series between the third terminal of the third transistor and the first terminal of the fourth transistor.
In the fan control circuit of the present application, the output unit further includes a fifth transistor, a second terminal of the fifth transistor is electrically connected to the power supply, and a third terminal of the fifth transistor is electrically connected to the second fan;
the first end of the first voltage stabilizing diode is electrically connected with the first end of the fifth transistor, and the first driving unit drives the second fan to rotate at the first rotating speed;
the first end of the second zener diode is electrically connected to the first end of the fifth transistor, and the second driving unit drives the second fan to rotate at the second rotation speed.
In the fan control circuit of the present application, the fan control circuit further includes a third capacitor and a fourth capacitor;
one end of the third capacitor is electrically connected with the third end of the fifth transistor, and the other end of the third capacitor is grounded;
one end of the fourth capacitor is electrically connected with the third end of the fifth transistor, and the other end of the fourth capacitor is grounded.
The application also provides a temperature adjusting device, which comprises the fan control circuit and the fan, wherein the fan control circuit controls the fan to operate.
The beneficial effect of this application is: the application provides a fan control circuit and attemperator, this fan control circuit includes the control unit, first drive unit, second drive unit and output unit, the control unit have with the first output of first drive unit's control end electric connection, and with the second output of second drive unit's control end electric connection, first drive unit and second drive unit all pass through output unit and fan electric connection, and first drive unit drive fan is with first rotational speed operation, second drive unit drive fan is with the second rotational speed operation. The application provides a fan control circuit is through setting up first drive unit and the second drive unit with two output difference electric connection of the control unit, utilize first driven unit and second drive unit to drive the fan operation respectively, realized the regulation of fan rotational speed, promote the flexibility of fan moving flexibility and adjusting temperature, be favorable to reducing the fan consumption, and reduce fan noise under certain condition, promote attemperator's temperature regulation performance.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first fan control circuit according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a second fan control circuit according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of a third fan control circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a fan control circuit and attemperator, fan control circuit includes the control unit, first drive unit, second drive unit and output unit, the control unit have with the control end electric connection's of first drive unit first output and with the control end electric connection's of second drive unit second output, first drive unit with the second drive unit all passes through output unit and fan electric connection, just first drive unit drive fan is with first rotational speed operation, second drive unit drive fan is with the operation of second rotational speed. The fan control circuit that this application embodiment provided is through setting up first drive unit and the second drive unit with two output difference electric connection of control unit, utilizes first driven unit and second drive unit to drive the fan operation respectively, has realized the regulation of fan rotational speed, promotes the flexibility of fan moving and the flexibility that adjusts the temperature, is favorable to reducing the fan consumption to reduce fan noise under certain condition, promote attemperator's temperature regulation performance.
The structural and performance characteristics of the fan control circuit provided by the present application are described below with reference to specific embodiments.
In an embodiment, please refer to fig. 1, wherein fig. 1 is a schematic structural diagram of a first fan control circuit according to an embodiment of the present disclosure. The fan control circuit includes: the driving device comprises a control unit 10, a first driving unit 20 and a second driving unit 30 which are electrically connected with the control unit 10, and an output unit 40 which is electrically connected with the first driving unit 20 and the second driving unit 30.
The control unit 10 is configured to provide a trigger signal to the first driving unit 20 and the second driving unit 30 to control the operating states of the first driving unit 20 and the second driving unit 30. The control unit 10 includes a first output terminal 101 and a second output terminal 102, and both the first output terminal 101 and the second output terminal 102 can independently output a high level signal and a low level signal; the first output end 101 is electrically connected to the control end of the first driving unit 20 to control the operating state of the first driving unit 20; the second output terminal 102 is electrically connected to the control terminal of the second driving unit 30 to control the working state of the second driving unit 30.
For example, when the first output terminal 101 outputs a high level signal and the second output terminal 102 outputs a low level signal, the first driving unit 20 is turned on and the second driving unit 30 is turned off; when the first output terminal 101 and the second output terminal 102 both output high level signals, both the first driving unit 20 and the second driving unit 30 are turned on; when the first output terminal 101 outputs a low level signal, both the first driving unit 20 and the second driving unit 30 are turned off.
Alternatively, the control unit 10 may be various types of single-chip microcomputers, micro-processing units or micro-control units.
The control terminal of the first driving unit 20 is electrically connected to the first output terminal 101, and the first driving unit 20 is electrically connected to the first fan 61 through the output unit 40. The first driving unit 20 drives the first fan 61 to operate at a first rotation speed under the control of the control unit 10 and under the action of the power signal provided by the output unit 40.
The control end of the second driving unit 30 is electrically connected to the second output end 102, and the second driving unit 30 is electrically connected to the first fan 61 through the output unit 40. The second driving unit 30 drives the first fan 61 to operate at a second rotation speed under the control of the control unit 10 and under the action of the power signal provided by the output unit 40, and the second rotation speed is different from the first rotation speed, so that the first fan 61 has two working states at the same time, and the temperature can be adjusted by selecting a proper rotation speed according to the temperature grade of the device to be temperature-adjusted.
Further, the first driving unit 20 includes a first transistor Q1 and a first zener diode D1, a first end of the first transistor Q1 is electrically connected to the first output end 101, a second end of the first transistor Q1 and a first end of the first zener diode D1 are both electrically connected to the first fan 61 through the output unit 40, and a third end of the first transistor Q1 and a second end of the first zener diode D1 are both grounded. Optionally, the first transistor Q1 is an NPN transistor, and the first terminal, the second terminal, and the third terminal of the first transistor Q1 are a base, a collector, and an emitter of the transistor, respectively. When the first output terminal 101 outputs a high level, the first transistor Q1 is turned on.
The first zener diode D1 has a unidirectional conductive characteristic, and its conductive direction is directed to the output unit 40. Therefore, when the power signal provided by the output unit 40 flows through the first zener diode D1, the power signal is cut off by the first zener diode D1, and a stable voltage is generated across the first zener diode D1, i.e., the first zener diode D1 has a specific regulated voltage. The voltage across the first zener diode D1 corresponds to the driving voltage of the first fan 61, so that the first driving unit 20 has the capability of driving the first fan 61 to operate at the first rotation speed.
The second driving unit 30 includes a second transistor Q2 and a second zener diode D2. A first end of the second transistor Q2 is electrically connected to the second output terminal 102, a second end of the second transistor Q2 is electrically connected to a second end of the second zener diode D2, a first end of the second zener diode D2 is electrically connected to the first fan 61 through the output unit 40, and a third end of the second transistor Q2 is grounded. Optionally, the second transistor Q2 is an NPN transistor, and the first terminal, the second terminal, and the third terminal of the second transistor Q2 are a base, a collector, and an emitter of the transistor, respectively. When the second output terminal 102 outputs a high level, the second transistor Q2 is turned on.
The second zener diode D2 has a unidirectional conductive characteristic, and its conductive direction is directed to the output unit 40. Therefore, when the power signal provided by the output unit 40 flows through the second zener diode D2, the power signal is cut off by the second zener diode D2, and a stable voltage is generated across the second zener diode D2, i.e., the second zener diode D2 has a specific regulated voltage. The voltage across the second zener diode D2 corresponds to the driving voltage of the first fan 61, so that the second driving unit 30 has the capability of driving the first fan 61 to operate at the second rotation speed.
Further, the regulated voltage of the second regulator diode D2 is less than the regulated voltage of the first regulator diode D1. Since the first end of the first zener diode D1 and the first end of the second zener diode D2 are both electrically connected to the first fan 61 through the output unit 40, and the second end of the first zener diode D1 and the second end of the second zener diode D2 are both directly or indirectly grounded, so that the first zener diode D1 and the second zener diode D2 form a parallel relationship with respect to the first fan 61, when the first output terminal 101 and the second output terminal 102 both output a high level, the voltage across the first fan 61 corresponds to the voltage across the second zener diode D2 having a lower zener voltage, so that the first fan 61 operates at a second rotational speed that is less than the first rotational speed.
The output unit 40 includes a third transistor Q3 and a fourth transistor Q4. A first end of the third transistor Q3 is electrically connected to the second end of the first transistor Q1, a second end of the third transistor Q3 is electrically connected to a power source VCC, and a third end of the third transistor Q3 is electrically connected to the first end of the fourth transistor Q4; a second terminal of the fourth transistor Q4 is electrically connected to the power VCC, and a third terminal of the fourth transistor Q4 is electrically connected to the first fan 61; a first end of the first zener diode D1 and a first end of the second zener diode D2 are both electrically connected to the first end of the fourth transistor Q4. The voltage provided by the power source VCC is greater than the regulated voltage of the first zener diode D1 and is also greater than the regulated voltage of the second zener diode D2.
Optionally, the third transistor Q3 is a PNP type transistor, and the first, second and third terminals of the third transistor Q3 are a base, an emitter and a collector of the transistor, respectively; the fourth transistor Q4 is an NPN transistor, and the first, second, and third terminals of the fourth transistor Q4 are a base, a collector, and an emitter of the transistor, respectively.
It is noted that when the first output terminal 101 outputs a high level, the first transistor Q1, the third transistor Q3, and the fourth transistor Q4 are all turned on; when the second input terminal 102 outputs a high level, the second transistor Q2 is turned on.
Further, a first resistor R1 is connected in series between the first terminal of the first transistor Q1 and the first input terminal 101, and a second resistor R2 is connected in series between the first terminal of the first transistor Q1 and the third terminal of the first transistor Q1. The first resistor R1 and the second resistor R2 both have the function of voltage division and current limitation, and the second resistor R2 is the bias resistor of the first transistor Q1.
Further, a third resistor R3 is connected in series between the first terminal of the second transistor Q2 and the second input terminal 102, and a fourth resistor R4 is connected in series between the first terminal of the second transistor Q2 and the third terminal of the second transistor Q2. The third resistor R3 and the fourth resistor R4 both have the function of voltage division and current limitation, and the fourth resistor R4 is a bias resistor of the second transistor Q2.
Further, a fifth resistor R5 is connected in series between the second terminal of the first transistor Q1 and the first terminal of the third transistor Q3, a sixth resistor R6 is connected in series between the second terminal of the third transistor Q3 and the first terminal of the third transistor Q3, and a seventh resistor R7 is connected in series between the third terminal of the third transistor Q3 and the first terminal of the fourth transistor Q4. The fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 all have a function of voltage division and current limitation, the sixth resistor R6 is a bias resistor of the third transistor Q3, and the seventh resistor R7 is a bias resistor of the fourth transistor Q4.
Further, the fan control circuit further comprises a first capacitor C1 and a second capacitor C2. One end of the first capacitor C1 is electrically connected to the third end of the fourth transistor Q4, and the other end of the first capacitor C1 is grounded; one end of the second capacitor C2 is electrically connected to the third end of the fourth transistor Q4, and the other end of the second capacitor C2 is grounded. The first capacitor C1 and the second capacitor C2 both have filtering and anti-interference functions, so as to ensure that the voltage output to the first fan 61 is stable, and further ensure that the first fan 61 operates stably.
Optionally, the fan control circuit further includes a first connector 51, the first connector 51 is electrically connected between the first fan 61 and the fourth transistor Q4, and the first connector 51 is configured to provide a connection port between the first fan 61 and the fan control circuit, so as to facilitate connection therebetween.
In an embodiment, please refer to fig. 2, fig. 2 is a schematic structural diagram of a second fan control circuit according to an embodiment of the present disclosure. It should be noted that the fan control circuit provided in this embodiment has the same or similar structural features as the fan control circuit provided in the embodiment shown in fig. 1, and the structural features of the fan control circuit in this embodiment will be described below, where details are not described in detail, please refer to the description of the above embodiment.
In this embodiment, the fan control circuit can simultaneously drive the two fans to operate at two different rotation speeds. The fan control circuit includes: a control unit 10, a first driving unit 20, a second driving unit 30, and an output unit 40. The control unit 10 is used for controlling the working states of the first driving unit 20 and the second driving unit 30. The control unit 10 includes a first output terminal 101 and a second output terminal 102, and both the first output terminal 101 and the second output terminal 102 can independently output a high level signal and a low level signal; the first output end 101 is electrically connected to the control end of the first driving unit 20 to control the operating state of the first driving unit 20; the second output terminal 102 is electrically connected to the control terminal of the second driving unit 30 to control the working state of the second driving unit 30. The control unit 10 may be various types of single-chip microcomputers, micro-processing units or micro-control units.
The first driving unit 20 is electrically connected to the first fan 61 and the second fan 62 through the output unit 40, and the first driving unit 20 drives the first fan 61 and the second fan 62 to operate at a first rotation speed under the control of the control unit 10 and under the action of the power signal provided by the output unit 40.
The second driving unit 30 is electrically connected to the first fan 61 and the second fan 62 through the output unit 40. The second driving unit 30 drives the first fan 61 and the second fan 62 to operate at a second rotation speed under the control of the control unit 10 and under the action of the power signal provided by the output unit 40, and the second rotation speed is different from the first rotation speed, so that the first fan 61 and the second fan 62 have two working states at the same time, and a proper rotation speed is selected according to the temperature grade of the equipment to be temperature-regulated to regulate the temperature.
The first driving unit 20 includes a first transistor Q1 and a first zener diode D1, a first end of the first transistor Q1 is electrically connected to the first output terminal 101, a second end of the first transistor Q1 and a first end of the first zener diode D1 are both electrically connected to the first fan 61 and the second fan 62 through the output unit 40, and a third end of the first transistor Q1 and a second end of the first zener diode D1 are both grounded.
The voltage across the first zener diode D1 corresponds to the driving voltage of the first fan 61 and the second fan 62, so that the first driving unit 20 has the capability of driving the first fan 61 and the second fan 62 to operate at the first rotation speed.
The second driving unit 30 includes a second transistor Q2 and a second zener diode D2. A first end of the second transistor Q2 is electrically connected to the second output terminal 102, a second end of the second transistor Q2 is electrically connected to a second end of the second zener diode D2, a first end of the second zener diode D2 is electrically connected to the first fan 61 and the second fan 62 through the output unit 40, and a third end of the second transistor Q2 is grounded.
The voltage across the second zener diode D2 corresponds to the driving voltage of the first fan 61 and the second fan 62, so that the second driving unit 30 has the capability of driving the first fan 61 and the second fan 62 to operate at the second rotation speed.
Wherein the regulated voltage of the second zener diode D2 is less than the regulated voltage of the first zener diode D1. Since the first terminal of the first zener diode D1 and the first terminal of the second zener diode D2 are electrically connected to the first fan 61 and the second fan 62 through the output unit 40, and a second terminal of the first zener diode D1 and a second terminal of the second zener diode D2 are both directly or indirectly grounded, so that the first and second zener diodes D1 and D2 are formed in parallel relation with respect to the first and second fans 61 and 62, respectively, and thus, when both the first output terminal 101 and the second output terminal 102 output a high level, the voltage across the first fan 61 and the voltage across the second fan 62 correspond to the voltage across the second zener diode D2 having a lower zener voltage, so that the first fan 61 and the second fan 62 are both operated at a second rotational speed less than the first rotational speed.
The output unit 40 includes a third transistor Q3, a fourth transistor Q4, and a fifth transistor Q5. A first end of the third transistor Q3 is electrically connected to the second end of the first transistor Q1, a second end of the third transistor Q3 is electrically connected to a power source VCC, and a third end of the third transistor Q3 is electrically connected to the first end of the fourth transistor Q4; a second terminal of the fourth transistor Q4 is electrically connected to the power VCC, and a third terminal of the fourth transistor Q4 is electrically connected to the first fan 61; a first end of the first zener diode D1 and a first end of the second zener diode D2 are both electrically connected to the first end of the fourth transistor Q4.
A first end of the fifth transistor Q5 is electrically connected to the first end of the first zener diode D1 and the first end of the second zener diode D2, a second end of the fifth transistor Q5 is electrically connected to the power source VCC, and a third end of the fifth transistor Q5 is electrically connected to the second fan 62.
The fifth transistor Q5 is an NPN transistor, and the first, second, and third terminals of the fifth transistor Q5 are a base, a collector, and an emitter of the transistor, respectively.
It is noted that when the first output terminal 101 outputs a high level, the first transistor Q1, the third transistor Q3, the fourth transistor Q4 and the fifth transistor Q5 are all turned on; when the second input terminal 102 outputs a high level, the second transistor Q2 is turned on.
Further, a first resistor R1 is connected in series between the first terminal of the first transistor Q1 and the first input terminal 101, and a second resistor R2 is connected in series between the first terminal of the first transistor Q1 and the third terminal of the first transistor Q1. A third resistor R3 is connected in series between the first terminal of the second transistor Q2 and the second input terminal 102, and a fourth resistor R4 is connected in series between the first terminal of the second transistor Q2 and the third terminal of the second transistor Q2. A fifth resistor R5 is connected in series between the second terminal of the first transistor Q1 and the first terminal of the third transistor Q3, a sixth resistor R6 is connected in series between the second terminal of the third transistor Q3 and the first terminal of the third transistor Q3, and a seventh resistor R7 is connected in series between the third terminal of the third transistor Q3 and the first terminal of the fourth transistor Q4.
Further, the fan control circuit further comprises a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4. One end of the first capacitor C1 is electrically connected to the third end of the fourth transistor Q4, and the other end of the first capacitor C1 is grounded; one end of the second capacitor C2 is electrically connected to the third end of the fourth transistor Q4, and the other end of the second capacitor C2 is grounded; one end of the third capacitor C3 is electrically connected to the third end of the fifth transistor Q5, and the other end of the third capacitor C3 is grounded; one end of the fourth capacitor C4 is electrically connected to the third end of the fifth transistor Q5, and the other end of the fourth capacitor C4 is grounded. The first capacitor C1 to the fifth capacitor C5 have functions of filtering and resisting disturbance, so as to ensure that the voltage output to the first fan 61 and the second fan 62 is stable.
Optionally, the fan control circuit further includes a first connector 51 and a second connector 52, the first connector 51 is electrically connected between the first fan 61 and the fourth transistor Q4, and the second connector 52 is electrically connected between the second fan 62 and the fifth transistor Q5.
In an embodiment, please refer to fig. 3, wherein fig. 3 is a schematic structural diagram of a third fan control circuit according to an embodiment of the present disclosure. It should be noted that the fan control circuit provided in this embodiment has the same or similar structural features as the fan control circuit provided in the above embodiment, and the structural features of the fan control circuit in this embodiment will be described below, where details are not described in detail, please refer to the description of the above embodiment.
In this embodiment, the fan control circuit can simultaneously drive the three fans to operate at two different rotation speeds. The fan control circuit includes: a control unit 10, a first driving unit 20, a second driving unit 30, and an output unit 40. The control unit 10 includes a first output terminal 101 and a second output terminal 102, and both the first output terminal 101 and the second output terminal 102 can independently output a high level signal and a low level signal; the first output end 101 is electrically connected to the control end of the first driving unit 20 to control the operating state of the first driving unit 20; the second output terminal 102 is electrically connected to the control terminal of the second driving unit 30 to control the working state of the second driving unit 30. The control unit 10 may be various types of single-chip microcomputers, micro-processing units or micro-control units.
The first driving unit 20 is electrically connected to the first fan 61, the second fan 62 and the third fan 63 through the output unit 40, and the first driving unit 20 drives the first fan 61, the second fan 62 and the third fan 63 to rotate at a first rotation speed under the control of the control unit 10 and the action of the power signal provided by the output unit 40.
The second driving unit 30 is electrically connected to the first fan 61, the second fan 62 and the third fan 63 through the output unit 40. The second driving unit 30 drives the first fan 61, the second fan 62 and the third fan 63 to operate at a second rotation speed under the control of the control unit 10 and under the action of the power signal provided by the output unit 40, and the second rotation speed is different from the first rotation speed, so that the first fan 61, the second fan 62 and the third fan 63 have two working states at the same time, and a proper rotation speed is selected according to the temperature grade of the equipment to be temperature-regulated to regulate the temperature.
The first driving unit 20 includes a first transistor Q1 and a first zener diode D1, a first end of the first transistor Q1 is electrically connected to the first output terminal 101, a second end of the first transistor Q1 and a first end of the first zener diode D1 are electrically connected to the first fan 61, the second fan 62 and the third fan 63 through the output unit 40, and a third end of the first transistor Q1 and a second end of the first zener diode D1 are grounded.
The voltage across the first zener diode D1 corresponds to the driving voltage of the first fan 61, the second fan 62, and the third fan 63, so that the first driving unit 20 has the capability of driving the first fan 61, the second fan 62, and the third fan 63 to operate at the first rotational speed.
The second driving unit 30 includes a second transistor Q2 and a second zener diode D2. A first end of the second transistor Q2 is electrically connected to the second output terminal 102, a second end of the second transistor Q2 is electrically connected to a second end of the second zener diode D2, a first end of the second zener diode D2 is electrically connected to the first fan 61, the second fan 62 and the third fan 63 through the output unit 40, and a third end of the second transistor Q2 is grounded.
The voltage across the second zener diode D2 corresponds to the driving voltage of the first fan 61, the second fan 62, and the third fan 63, so that the second driving unit 30 has the capability of driving the first fan 61, the second fan 62, and the third fan 63 to operate at the second rotational speed.
Wherein the regulated voltage of the second zener diode D2 is less than the regulated voltage of the first zener diode D1. Since the first end of the first zener diode D1 and the first end of the second zener diode D2 are electrically connected to the first fan 61, the second fan 62 and the third fan 63 through the output unit 40, and the second end of the first zener diode D1 and the second end of the second zener diode D2 are directly or indirectly grounded, so that the first zener diode D1 and the second zener diode D2 form a parallel relationship with respect to the first fan 61, the second fan 62 and the third fan 63, respectively, when the first output end 101 and the second output end 102 both output high voltages, the voltage across the first fan 61, the voltage across the second fan 62 and the voltage across the third fan 63 correspond to the voltage across the second zener diode D2 having a lower zener voltage, so that the first fan 61, the second fan 62 and the third fan 63 have high voltages, respectively, The second fan 62 and the third fan 63 are both operated at a second rotational speed that is less than the first rotational speed.
The output unit 40 includes a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6. A first end of the third transistor Q3 is electrically connected to the second end of the first transistor Q1, a second end of the third transistor Q3 is electrically connected to a power source VCC, and a third end of the third transistor Q3 is electrically connected to the first end of the fourth transistor Q4; a second terminal of the fourth transistor Q4 is electrically connected to the power VCC, and a third terminal of the fourth transistor Q4 is electrically connected to the first fan 61; a first end of the first zener diode D1 and a first end of the second zener diode D2 are both electrically connected to the first end of the fourth transistor Q4.
A first end of the fifth transistor Q5 is electrically connected to the first end of the first zener diode D1 and the first end of the second zener diode D2, a second end of the fifth transistor Q5 is electrically connected to the power source VCC, and a third end of the fifth transistor Q5 is electrically connected to the second fan 62.
A first end of the sixth transistor Q6 is electrically connected to the first end of the first zener diode D1 and the first end of the second zener diode D2, a second end of the sixth transistor Q6 is electrically connected to the power source VCC, and a third end of the sixth transistor Q6 is electrically connected to the third fan 63.
The sixth transistor Q6 is an NPN transistor, and the first terminal, the second terminal, and the third terminal of the sixth transistor Q6 are a base, a collector, and an emitter of the transistor, respectively.
It is noted that when the first output terminal 101 outputs a high level, the first transistor Q1, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5 and the sixth transistor Q6 are all turned on; when the second input terminal 102 outputs a high level, the second transistor Q2 is turned on.
Further, a first resistor R1 is connected in series between the first terminal of the first transistor Q1 and the first input terminal 101, and a second resistor R2 is connected in series between the first terminal of the first transistor Q1 and the third terminal of the first transistor Q1. A third resistor R3 is connected in series between the first terminal of the second transistor Q2 and the second input terminal 102, and a fourth resistor R4 is connected in series between the first terminal of the second transistor Q2 and the third terminal of the second transistor Q2. A fifth resistor R5 is connected in series between the second terminal of the first transistor Q1 and the first terminal of the third transistor Q3, a sixth resistor R6 is connected in series between the second terminal of the third transistor Q3 and the first terminal of the third transistor Q3, and a seventh resistor R7 is connected in series between the third terminal of the third transistor Q3 and the first terminal of the fourth transistor Q4.
Further, the fan control circuit further includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6. One end of the first capacitor C1 is electrically connected to the third end of the fourth transistor Q4, and the other end of the first capacitor C1 is grounded; one end of the second capacitor C2 is electrically connected to the third end of the fourth transistor Q4, and the other end of the second capacitor C2 is grounded; one end of the third capacitor C3 is electrically connected to the third end of the fifth transistor Q5, and the other end of the third capacitor C3 is grounded; one end of the fourth capacitor C4 is electrically connected to the third end of the fifth transistor Q5, and the other end of the fourth capacitor C4 is grounded; one end of the fifth capacitor C5 is electrically connected to the third end of the sixth transistor Q6, and the other end of the fifth capacitor C5 is grounded; one end of the sixth capacitor C6 is electrically connected to the third end of the sixth transistor Q6, and the other end of the sixth capacitor C6 is grounded.
Optionally, the fan control circuit further includes a first connector 51, a second connector 52 and a third connector 53, the first connector 51 is electrically connected between the first fan 61 and the fourth transistor Q4, the second connector 52 is electrically connected between the second fan 62 and the fifth transistor Q5, and the third connector 53 is electrically connected between the third fan 63 and the sixth transistor Q6.
It should be noted that the above embodiments of the present application provide three fan control circuits, but the present application is not limited thereto, and those skilled in the art can obtain other embodiments based on the above concepts without creative efforts.
The embodiment of the application also provides a temperature adjusting device, which comprises the fan control circuit and the fan, wherein the fan control circuit controls the operation of the fan.
It should be noted that, although the present application has been described with reference to specific examples, the above-mentioned examples are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be limited by the appended claims.
Claims (12)
1. A fan control circuit, comprising:
a control unit including a first output terminal and a second output terminal;
the control end of the first driving unit is electrically connected with the first output end;
the control end of the second driving unit is electrically connected with the second output end; and
the output unit is electrically connected with the first drive unit and the second drive unit, the first drive unit is electrically connected with the first fan through the output unit, the first drive unit drives the first fan to rotate at a first rotating speed, the second drive unit is electrically connected with the first fan through the output unit, and the second drive unit drives the first fan to rotate at a second rotating speed.
2. The fan control circuit of claim 1, wherein the first driving unit comprises a first transistor and a first zener diode;
the first end of the first transistor is electrically connected with the first output end, the second end of the first transistor and the first end of the first voltage stabilizing diode are both electrically connected to the first fan through the output unit, and the third end of the first transistor and the second end of the first voltage stabilizing diode are both grounded.
3. The fan control circuit according to claim 2, wherein the second driving unit includes a second transistor and a second zener diode;
the first end of the second transistor is electrically connected with the second output end, the second end of the second transistor is electrically connected with the second end of the second voltage stabilizing diode, the first end of the second voltage stabilizing diode is electrically connected to the first fan through the output unit, and the third end of the second transistor is grounded.
4. The fan control circuit according to claim 3, wherein the regulated voltage of the second zener diode is less than the regulated voltage of the first zener diode.
5. The fan control circuit according to claim 3, wherein the output unit includes a third transistor and a fourth transistor;
a first end of the third transistor is electrically connected with a second end of the first transistor, a second end of the third transistor is electrically connected with a power supply, and a third end of the third transistor is electrically connected with a first end of the fourth transistor;
a second end of the fourth transistor is electrically connected with the power supply, and a third end of the fourth transistor is electrically connected with the first fan;
the first end of the first voltage stabilizing diode and the first end of the second voltage stabilizing diode are both electrically connected with the first end of the fourth transistor.
6. The fan control circuit of claim 5 further comprising a first capacitor and a second capacitor;
one end of the first capacitor is electrically connected with the third end of the fourth transistor, and the other end of the first capacitor is grounded;
one end of the second capacitor is electrically connected with the third end of the fourth transistor, and the other end of the second capacitor is grounded.
7. The fan control circuit according to claim 2, wherein a first resistor is connected in series between the first terminal of the first transistor and the first input terminal, and a second resistor is connected in series between the first terminal of the first transistor and the third terminal of the first transistor.
8. The fan control circuit according to claim 3, wherein a third resistor is connected in series between the first terminal of the second transistor and the second input terminal, and a fourth resistor is connected in series between the first terminal of the second transistor and the third terminal of the second transistor.
9. The fan control circuit according to claim 5, wherein a fifth resistor is connected in series between the second terminal of the first transistor and the first terminal of the third transistor, a sixth resistor is connected in series between the second terminal of the third transistor and the first terminal of the third transistor, and a seventh resistor is connected in series between the third terminal of the third transistor and the first terminal of the fourth transistor.
10. The fan control circuit according to claim 6, wherein the output unit further comprises a fifth transistor, a second terminal of the fifth transistor is electrically connected to the power supply, and a third terminal of the fifth transistor is electrically connected to the second fan;
the first end of the first voltage stabilizing diode is electrically connected with the first end of the fifth transistor, and the first driving unit drives the second fan to rotate at the first rotating speed;
the first end of the second zener diode is electrically connected to the first end of the fifth transistor, and the second driving unit drives the second fan to rotate at the second rotation speed.
11. The fan control circuit of claim 10 further comprising a third capacitor and a fourth capacitor;
one end of the third capacitor is electrically connected with the third end of the fifth transistor, and the other end of the third capacitor is grounded;
one end of the fourth capacitor is electrically connected with the third end of the fifth transistor, and the other end of the fourth capacitor is grounded.
12. A thermostat comprising the fan control circuit of any one of claims 1 to 11 and a fan, the fan control circuit controlling the operation of the fan.
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| CN202111220828.4A CN113931865B (en) | 2021-10-20 | 2021-10-20 | Fan control circuit and temperature adjusting device |
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| CN202111220828.4A CN113931865B (en) | 2021-10-20 | 2021-10-20 | Fan control circuit and temperature adjusting device |
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