CN212654247U - Fan control circuit and car seat fan - Google Patents
Fan control circuit and car seat fan Download PDFInfo
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- CN212654247U CN212654247U CN202020877563.XU CN202020877563U CN212654247U CN 212654247 U CN212654247 U CN 212654247U CN 202020877563 U CN202020877563 U CN 202020877563U CN 212654247 U CN212654247 U CN 212654247U
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Abstract
The utility model discloses a fan control circuit and car seat fan, fan control circuit includes hall acquisition circuit, singlechip and fan motor drive circuit; the fan motor driving circuit comprises a driving signal receiving end, the Hall signal output end is electrically connected with the Hall signal receiving end, and the driving signal output end is electrically connected with the driving signal receiving end; the single chip microcomputer further comprises a control module, and the control module is used for controlling the driving signal output end to stop outputting the driving signal when the Hall count received by the Hall signal receiving end is kept unchanged within the preset time. Whether drive information is output or not is controlled according to the Hall count of the Hall acquisition circuit, when the single chip microcomputer outputs a normal drive signal, if the Hall count is unchanged, the fan is judged to be locked, and at the moment, the drive signal output end is controlled to stop outputting the drive signal, so that the fan is prevented from being damaged.
Description
Technical Field
The embodiment of the utility model provides a relate to automobile design technical field, especially relate to a fan control circuit and car seat fan.
Background
The existing automobile seat fan technology is mainly focused on how to improve the control effect of the automobile seat fan, and how to protect the automobile seat fan is less concerned, so that the automobile seat fan runs abnormally easily when encountering external abnormal conditions in the running process, and the normal running of the automobile seat fan is influenced.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a fan control circuit and car seat fan explain how to handle when the car seat fan meets external abnormal conditions in the operation process, guarantee car seat fan normal operating.
In a first aspect, an embodiment of the present invention provides a fan control circuit, which includes a hall acquisition circuit, a single chip, and a fan motor driving circuit;
the fan motor driving circuit comprises a driving signal receiving end, the Hall signal output end is electrically connected with the Hall signal receiving end, and the driving signal output end is electrically connected with the driving signal receiving end;
the single chip microcomputer further comprises a control module, and the control module is used for controlling the driving signal output end to stop outputting the driving signal when the Hall count received by the Hall signal receiving end is kept unchanged within the preset time.
Optionally, the driving signal output end includes a first driving signal output end, a second driving signal output end, a third driving signal output end and a fourth driving signal output end;
the fan motor driving circuit comprises a fan driving coil, a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; the fan drive coil includes a first end and a second end; the first switch tube is arranged between the first driving signal output end and the first end in series, the second switch tube is arranged between the second driving signal output end and the second end in series, the third switch tube is arranged between the third driving signal output end and the first end in series, and the fourth switch tube is arranged between the fourth driving signal output end and the second end in series;
the control module is used for controlling at least one signal output end of the first driving signal output end and the fourth driving signal output end to stop outputting driving signals and/or controlling at least one signal output end of the second driving signal output end and the third driving signal output end to stop outputting driving signals when the Hall count received by the Hall signal receiving end is kept unchanged within preset time.
Optionally, the hall acquisition circuit further includes a hall chip, a first power supply, a first capacitor, a second capacitor, a first resistor, and a second resistor;
the power supply input end of the Hall chip is electrically connected with the first power supply, the grounding end of the Hall chip is grounded, the signal output end of the Hall chip is electrically connected with the first end of the first resistor, and the second end of the first resistor is electrically connected with the power supply input end of the Hall chip;
the first end of the first capacitor is electrically connected with the power input end of the Hall chip, and the second end of the first capacitor is grounded;
the first end of the second resistor is electrically connected with the signal output end of the Hall chip, and the second end of the second resistor is the Hall signal output end of the Hall acquisition circuit and is electrically connected with the Hall signal receiving end of the singlechip;
and the first end of the second capacitor is electrically connected with the second end of the second resistor, and the second end of the second capacitor is grounded.
Optionally, the fan control circuit further comprises a temperature acquisition circuit, wherein the temperature acquisition circuit comprises a thermistor and a first voltage signal output end; the single chip microcomputer further comprises a first voltage signal receiving end, and the first voltage signal output end is electrically connected with the first voltage signal receiving end;
the control module is further used for controlling the driving signal output end to stop outputting the driving signal when the voltage value received by the first voltage signal receiving end is larger than a preset voltage value; the preset voltage value corresponds to the warning temperature of the fan control circuit during working.
Optionally, the temperature acquisition circuit further includes a second power supply, a third resistor and a fourth resistor, the first end of the third resistor is electrically connected to the second power supply, the second end of the third resistor is electrically connected to the first end of the thermistor, the second end of the thermistor is grounded, the first end of the fourth resistor is electrically connected to the second end of the third resistor, and the second end of the fourth resistor is the first voltage signal output end and is electrically connected to the first voltage signal receiving end in the single chip microcomputer.
Optionally, the fan control circuit further includes a third capacitor, a first end of the third capacitor is electrically connected to a second end of the fourth resistor, and a second end of the third capacitor is grounded.
Optionally, the thermistor includes a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
Optionally, the fan control circuit further includes a voltage acquisition circuit, the voltage acquisition circuit includes a second voltage signal output end, the single chip microcomputer further includes a second voltage signal receiving end, and the second voltage signal output end is electrically connected to the second voltage signal receiving end;
the control module is used for controlling the driving signal output end to stop outputting the driving signal when the voltage value received by the second voltage signal receiving end exceeds a preset range.
Optionally, the voltage acquisition circuit includes a fifth resistor, a sixth resistor, a seventh resistor, and a fourth capacitor;
a first end of the fifth resistor is electrically connected with a vehicle battery system, a second end of the fifth resistor is electrically connected with a first end of the sixth resistor, and a second end of the sixth resistor is grounded;
a first end of the seventh resistor is electrically connected with a second end of the fifth resistor, and the second end of the seventh resistor is the second voltage signal output end and is electrically connected with a second voltage signal receiving end of the singlechip;
and the first end of the fourth capacitor is electrically connected with the second end of the seventh resistor, and the second end of the fourth capacitor is grounded.
In a second aspect, an embodiment of the present invention further provides an automobile seat fan, including a PCB circuit board and a fan device, where the PCB circuit board includes the fan control circuit of the first aspect;
the fan device comprises fan blades, an upper shell and a base shell, wherein the upper shell is connected with the base shell through a buckle, and the fan blades are arranged in the upper shell and the base shell;
the PCB is fixed on one side of the base shell of the fan device, which is close to the fan blades.
The embodiment of the utility model provides a fan control circuit and car seat fan, it includes hall acquisition circuit to set up fan control circuit, singlechip and fan motor drive circuit, it includes hall chip to set up hall acquisition circuit simultaneously, hall signal output part and control module, the singlechip includes hall signal receiving terminal and drive signal output part, fan motor drive circuit includes the drive signal receiving terminal, hall count received at hall signal receiving terminal when predetermineeing the time keeps unchangeable, it shows that the fan has taken place the stall this moment, control module control drive signal output part stops output drive signal this moment, avoid the fan to take place to damage, strengthen the protection effect to the fan.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic block diagram of a fan control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a fan control circuit according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of another fan control circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of another fan control circuit according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of another fan control circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of another fan control circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a car seat fan according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail through the following embodiments with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention all fall into the protection scope of the present invention.
Fig. 1 is a schematic diagram of a block diagram structure of a fan control circuit provided in an embodiment of the present invention, fig. 2 is a schematic diagram of a circuit structure of a fan control circuit provided in an embodiment of the present invention, and as shown in fig. 1 and fig. 2, a fan control circuit 10 provided in an embodiment of the present invention includes a hall acquisition circuit 11, a single chip 12, and a fan motor driving circuit 13; the Hall acquisition circuit 11 comprises a Hall signal output end 11a, the single chip microcomputer 12 comprises a Hall signal receiving end 12a and a driving signal output end 12b, the fan motor driving circuit 13 comprises a driving signal receiving end 13a, the Hall signal output end 11a is electrically connected with the Hall signal receiving end 12a, and the driving signal output end 12b is electrically connected with the driving signal receiving end 13 a; the single chip microcomputer 12 further includes a control module 121, and the control module 121 is configured to control the driving signal output end 12b to stop outputting the driving signal when the hall count received by the hall signal receiving end 12a is kept unchanged within a preset time.
For example, as shown in fig. 1 and fig. 2, the hall collecting circuit 11 is configured to determine the number of rotations of the fan, when the fan rotates by a quarter of a turn, the hall collecting circuit 11 sends a hall signal to the single chip microcomputer 12, and after receiving the hall signal, a hall signal receiving end MCLR of the single chip microcomputer 12 switches a level output to the fan motor driving circuit 13, so that a high voltage and a low voltage at two ends of a fan driving coil M1 in the fan motor driving circuit 13 change, and the fan is driven to rotate continuously in one direction. When the driving signal drives the fan to normally rotate, the hall acquisition circuit 11 can acquire a hall count based on the rotation condition of the fan and send the hall count to the single chip microcomputer 12. When singlechip 12 normally outputs drive signal to fan motor drive circuit 13, drive signal can drive the fan and rotate under the normal condition, hall count can change, if under the condition that singlechip 12 normally outputs drive signal to fan motor drive circuit 13, hall count does not change, judge this moment that the fan may have met stifled commentaries on classics, continue to output drive signal to fan motor drive circuit 13 this moment, can cause the fan short time to produce a large amount of heats, probably cause singlechip 112 and fan motor drive circuit 13 to take place to damage, influence the follow-up use of fan. Therefore, under the condition that the single chip microcomputer 12 normally outputs the driving signal to the fan motor driving circuit 13, if the hall count is not changed, the control module 121 controls the driving signal output end 12b to stop outputting the driving signal at the moment, and controls the fan motor driving circuit 13 to stop working, so that the fan motor driving circuit 13 is prevented from being damaged, the protection of the fan motor driving circuit 13 is enhanced, and the protection effect of the fan is further enhanced.
To sum up, the embodiment of the utility model provides a fan control circuit, include hall acquisition circuit through setting up fan control circuit, singlechip and fan motor drive circuit, it includes hall chip to set up hall acquisition circuit simultaneously, hall signal output part and control module, the singlechip includes hall signal receiving terminal and drive signal output part, fan motor drive circuit includes the drive signal receiving terminal, hall count received at hall signal receiving terminal when predetermineeing the time keeps unchangeable, it indicates that the fan has taken place the stall this moment, control module control drive signal output part stops output drive signal this moment, avoid the fan to take place to damage, strengthen the protection effect to the fan.
On the basis of the above embodiment, with continued reference to fig. 2, the driving signal output terminal 12b may include a first driving signal output terminal RC4, a second driving signal output terminal RC2, a third driving signal output terminal RC5 and a fourth driving signal output terminal RC 3; the fan motor driving circuit 13 includes a fan driving coil M1, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, and a fourth switching tube Q4; fan drive coil M1 includes a first end 1 and a second end 2; the control end of the first switch tube Q1 is electrically connected with a first drive signal output end RC4, the output end of the first switch tube Q1 is electrically connected with a first end 1, the control end of the second switch tube Q2 is electrically connected with a second drive signal output end RC2, the output end of the second switch tube Q2 is electrically connected with a second end 2, the control end of the third switch tube Q3 is electrically connected with a third drive signal output end RC3, the output end of the third switch tube Q3 is electrically connected with the first end 1, the control end of the fourth switch tube Q4 is electrically connected with a fourth drive signal output end RC3, and the output end of the fourth switch tube Q4 is electrically connected with the second end 2; the control module 121 is configured to control at least one of the first driving signal output terminal RC4 and the fourth driving signal output terminal RC3 to stop outputting the driving signal and/or at least one of the second driving signal output terminal RC2 and the third driving signal output terminal RC5 to stop outputting the driving signal when the hall count received by the hall signal receiving terminal is kept unchanged within the preset time.
Specifically, as shown in fig. 2, the fan driving coil M1 drives the fan to rotate, and the fan driving coil M1 is controlled by applying a corresponding control signal. For example, when the first end 1 of the fan driving coil M1 is at a positive voltage and the second end 2 is at a negative voltage, the fan starts to rotate; after the fan rotates a quarter of a turn, in order to make the fan rotate in one direction, a corresponding control signal is applied to the fan motor driving circuit, so as to apply a negative voltage to the first terminal 1 of the fan driving coil M1 and a positive voltage to the second terminal 2.
In the following description, the first switching transistor Q1 and the second switching transistor Q2 are both PMOS fets, and the third switching transistor Q3 and the fourth switching transistor Q4 are both NMOS fets.
Specifically, the control end, the input end and the output end of the first switch tube Q1 and the second switch tube Q2 are respectively a gate, a source and a drain of a PMOS type field effect transistor; the control end, the input end and the output end of the third switching tube Q3 and the fourth switching tube Q4 are respectively the grid, the drain and the source of the NMOS field effect tube. The implementation method that the first end 1 of the fan driving coil M1 is positive voltage and the second end 2 is negative voltage is as follows: the first driving signal output end RC4 of the single chip microcomputer 12 outputs a control level to control the first driving unit Q5 to pull down the control end potential of the first switching tube Q1, the first switching tube Q1 is turned on, the first end 1 of the first switching tube Q1 is at a high level, and the first end 1 of the fan driving coil M1 is at a high level; a fourth driving signal output end RC3 of the single chip microcomputer 12 outputs a control level, the control end potential of the fourth switching tube Q4 is pulled high, a first end 1 of the fourth switching tube Q4 is grounded, the fourth switching tube Q4 is turned on, a second end 2 of the fourth switching tube Q4 is at a low level, and a second end 2 of the fan driving coil M1 is at a low level; thus, the first terminal 1 of the fan driving coil M1 is a positive voltage, and the second terminal 2 is a negative voltage; the fan starts to rotate.
When the fan runs for a quarter of a turn, the control levels output by the first drive signal output end RC4 and the fourth drive signal output end RC3 of the single chip microcomputer 12 are changed from high level to low level, the first switch tube Q1 and the fourth switch tube Q4 are turned off, at this time, the second drive signal output end RC2 of the single chip microcomputer 12 outputs the control level, the second drive unit Q6 is controlled to pull down the control end potential of the second switch tube Q2, the second switch tube Q2 is turned on, the first end 1 of the second switch tube Q2 is high level, and the second end 2 of the fan drive coil M1 is high level; the third driving signal output end RC5 of the single chip microcomputer 12 outputs a control level, the control end potential of the third switching tube Q3 is pulled high, the first end 1 of the third switching tube Q3 is grounded, the third switching tube Q3 is turned on, the second end 2 of the third switching tube Q3 is at a low level, and the first end 1 of the fan driving coil M1 is at a low level; thus, the first terminal 1 of the fan driving coil M1 is a negative voltage, and the second terminal 2 is a positive voltage; the fan continues to rotate in one direction.
Therefore, the first driving signal output terminal RC4 and the fourth driving signal output terminal RC3 cooperate to drive the fan to rotate, and the second driving signal output terminal RC2 and the third driving signal output terminal RC5 cooperate to drive the fan to rotate. Under the condition that singlechip 12 normally outputs drive signal to fan motor drive circuit 13, if the hall count does not change, control module 121 can control at least one of first drive signal output terminal RC4 and fourth drive signal output terminal RC3 to stop outputting drive signal this moment, guarantee the fan stall, and/or, control at least one of second drive signal output terminal RC2 and third drive signal output terminal RC5 to stop outputting drive signal, guarantee the fan stall, avoid fan motor drive circuit 13 to take place to damage, strengthen the protection to fan motor drive circuit 13, and then strengthen the protection effect to the fan.
It should be noted that the embodiment of the present invention provides a control which one or which driving signal output end stops outputting the driving signal to stop the fan rotation without limitation, and can control one driving signal output end to stop outputting the driving signal, and also can control a plurality of driving signal output ends to stop outputting the driving signal. Preferably, the first driving signal output end RC4, the second driving signal output end RC2, the third driving signal output end RC5 and the fourth driving signal output end RC3 can be controlled to stop outputting the control signal at the same time, so that the fan can be ensured to stop rotating, the control method can be ensured to be simple, the success rate is high, and the protection effect on the fan control circuit is good.
Optionally, the hall acquisition circuit 11 further includes a hall chip H1, a first power VCC1, a first capacitor C1, a second capacitor C2, a first resistor R1, and a second resistor R2; a power supply input end V of the Hall chip H1 is electrically connected with a first power supply VCC1, a grounding end G of the Hall chip H1 is grounded, a signal output end O of the Hall chip H1 is electrically connected with a first end of a first resistor R1, and a second end of a first resistor R1 is electrically connected with a power supply input end V of the Hall chip H1; a first end of the first capacitor C1 is electrically connected with a power input end V of the Hall chip H1, and a second end of the first capacitor C1 is grounded; a first end of the second resistor R2 is electrically connected with a signal output end O of the Hall chip H1, and a second end of the second resistor R2 is a Hall signal output end 11a of the Hall acquisition circuit 11 and is electrically connected with a Hall signal receiving end 12a of the singlechip 12; the first end of the second capacitor C2 is electrically connected to the second end of the second resistor R2, and the second end of the second capacitor C2 is grounded.
Illustratively, the hall chip H1 may be a bipolar latching patch hall US1881KSE, the hall signal output by the hall acquisition circuit 11 to the single chip microcomputer 12 may be a voltage signal, the voltage is normally high, when the fan blade mechanism of the fan rotates, the hall chip H1 is turned on, the voltage output to the hall signal receiving terminal MCLR of the single chip microcomputer 12 becomes a low level, and when the hall level signal received by the single chip microcomputer 12 is a low level, the level output by the single chip microcomputer 12 to the fan motor driving circuit 13 is changed, so as to drive the fan motor coil M1 to rotate or regulate speed.
Fig. 3 is a schematic diagram of a block diagram structure of another fan control circuit provided in an embodiment of the present invention, fig. 4 is a schematic diagram of a circuit structure of another fan control circuit provided in an embodiment of the present invention, and as shown in fig. 3 and fig. 4, the fan control circuit provided in an embodiment of the present invention may further include a temperature acquisition circuit 14, where the temperature acquisition circuit 14 includes a thermistor 141 and a first voltage signal output end 14 a; the single chip microcomputer 12 can further include a first voltage signal receiving end 12c, and the first voltage signal output end 14a is electrically connected with the first voltage signal receiving end 12 c; the control module 121 is further configured to control the driving signal output end 12b to stop outputting the driving signal when the voltage value received by the first voltage signal receiving end 12c is greater than the preset voltage value; wherein, the preset voltage value is the warning temperature corresponding to the operation of the fan control circuit 10.
Exemplarily, the embodiment of the present invention provides a fan control circuit 10, which can further include a temperature acquisition circuit, and perform over-temperature protection on the fan through the temperature acquisition circuit 14, so as to avoid the fan from being damaged when the fan is operated at an excessively high or excessively low ambient temperature. Specifically, the temperature acquisition circuit 14 includes a thermistor 141, when the ambient temperature changes, the resistance of the thermistor 141 changes significantly, the voltage signal output by the temperature acquisition circuit 14 changes significantly, and the single chip 12 can determine the temperature according to the received voltage signal, wherein the preset voltage value corresponds to the alarm temperature or the limit temperature at which the fan control circuit 10 operates, when the control system 121 in the single chip 12 determines that the current ambient temperature of the fan control system 10 is greater than the alarm temperature according to the received voltage signal, the drive signal output end 12b is controlled to stop outputting the drive signal, the single chip 12 and the fan motor drive circuit 13 are controlled to stop operating, the fan is prevented from being damaged, and the protection effect on the fan is enhanced. For example, when the fan is locked, the fan generates a large amount of heat and releases the heat to the environment, which causes the temperature of the environment to rise, and at this time, in addition to the hall count as the judgment basis for the fan stop as described above, the voltage signal received by the control module 121 may be used as the judgment basis, the current environment temperature is determined according to the voltage signal, and when the environment temperature exceeds the warning temperature, the fan is controlled to stop.
On the basis of the foregoing embodiment, with reference to fig. 4, the temperature acquisition circuit further includes a second power VCC2, a third resistor R3, and a fourth resistor R4, a first end of the third resistor R3 is electrically connected to the second power VCC2, a second end of the third resistor R3 is electrically connected to the first end of the thermistor 141, a second end of the thermistor 141 is grounded, a first end of R4 of the fourth resistor is electrically connected to the second end of the third resistor R3, and a second end of the fourth resistor R4 is a first voltage signal output terminal 14a and is electrically connected to the first voltage signal receiving terminal 12c in the single chip 12. The third resistor R3 is electrically connected to the second power source VCC2 as a pull-up resistor, and the fourth resistor R4 is provided as a current limiting resistor in the voltage signal output path. The thermistor 141 can be a Positive Temperature Coefficient (PTC) thermistor or a Negative Temperature Coefficient (NTC) thermistor, and the embodiment of the present invention does not limit this. When the thermistor is a PTC thermistor, the resistance value of the thermistor is increased along with the increase of the temperature, and the voltage output by the first voltage signal output terminal is increased; when the thermistor is an NTC thermistor, the resistance of the thermistor decreases as the temperature increases, and the voltage output from the first voltage signal output terminal decreases. For example, when the thermistor is an NTC thermistor, the resistance of the thermistor is 10K at a normal temperature of 25 ℃; the resistance value of the thermistor is 0.97K at 90 ℃; the voltage is divided by a third resistor R3 in the circuit, the obtained voltage is input to the single chip microcomputer, the single chip microcomputer collects the current voltage and reversely deduces the ambient temperature, when the ambient temperature is higher than 90 ℃, the single chip microcomputer stops driving signal output, the fan stops running, and protection of the fan is enhanced.
On the basis of the foregoing embodiment, as shown in fig. 4 with continued reference, the fan control circuit 10 provided in the embodiment of the present invention may further include a third capacitor C3, wherein the first end of the third capacitor C3 is electrically connected to the second end of the fourth resistor R4, and the second end of the third capacitor C3 is grounded. The third capacitor C3 is used as a filter capacitor, so that the interference of interference waves to the circuit can be filtered, and the control effect of the fan control circuit is improved.
Optionally, fig. 5 is a schematic diagram of a block diagram structure of another fan control circuit provided in the embodiment of the present invention, fig. 6 is a schematic diagram of a circuit structure of another fan control circuit provided in the embodiment of the present invention, which is shown in fig. 5 and fig. 6, the embodiment of the present invention provides a fan control circuit that can further include a voltage acquisition circuit 15, the voltage acquisition circuit 15 includes a second voltage signal output terminal 15a, the single chip 12 further includes a second voltage signal receiving terminal 12d, and the second voltage signal output terminal 15a is electrically connected to the second voltage signal receiving terminal 12 d; the control module 121 is configured to control the driving signal output end 12b to stop outputting the driving signal when the voltage value received by the second voltage signal receiving end 12d exceeds the preset range, where RA2 in the chip 12 in fig. 6 is the second voltage signal receiving end 12 d.
Illustratively, the voltage acquisition circuit 15 is configured to acquire the voltage condition of the vehicle battery system VBAT in real time, and when it is acquired that the current voltage of the vehicle battery system VBAT exceeds a preset range, for example, is higher than 16V or lower than 9V, it indicates that the voltage condition of the vehicle battery system VBAT is abnormal, the voltage acquisition circuit 15 inputs a voltage abnormal signal to the single chip microcomputer 12 through the second voltage signal receiving end RA2 of the single chip microcomputer 12, the single chip microcomputer 12 stops outputting a driving signal to the fan motor driving circuit 11 after receiving the voltage abnormal signal, and the fan stops rotating, so as to enhance the protection effect of the fan.
On the basis of the above embodiment, the voltage acquisition circuit 15 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a fourth capacitor C4; a first end of the fifth resistor R5 is electrically connected with the vehicle battery system VBAT, a second end of the fifth resistor R5 is electrically connected with a first end of the sixth resistor R6, and a second end of the sixth resistor R6 is grounded; a first end of the seventh resistor R7 is electrically connected to a second end of the fifth resistor R5, and a second end of the seventh resistor R7 is a second voltage signal output end 15a and is electrically connected to a second voltage signal receiving end 12d of the single chip microcomputer 12; the first end of the fourth capacitor C4 is electrically connected to the second end of the seventh resistor R7, and the second end of the fourth capacitor C4 is grounded.
With continued reference to fig. 6, fan control circuitry 10 may also include voltage conversion circuitry 16; the voltage conversion circuit 16 comprises a voltage stabilizing chip U1, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and a third power output port VCC 3; a first end of the fifth capacitor C5 is electrically connected with the voltage input end IN of the voltage stabilizing chip U1, and a second end of the fifth capacitor C5 is grounded; an input end IN of the voltage stabilizing chip U1 is electrically connected with a VBAT of the vehicle battery system, a first grounding end GND1 and a second grounding end GND3 of the voltage stabilizing chip U1 are both grounded, a signal output end OUT of the voltage stabilizing chip U1 is electrically connected with a first end of a sixth capacitor C6, and a second end of the sixth capacitor C6 is grounded; a first end of the seventh capacitor C7 is electrically connected with the power output port VCC3, and a second end of the seventh capacitor C7 is grounded; the power output port VCC3 is electrically connected with the power input end VDD of the single chip 12. The voltage stabilizing chip U1 in the voltage converting circuit 16 may be a low-attenuation linear voltage regulator NCV4274, the voltage converting circuit 16 is connected to a vehicle battery system VBAT, converts the vehicle battery voltage into 5V, and outputs the 5V voltage to the single chip microcomputer 12 through a voltage output port VCC3 to supply power to the single chip microcomputer 12. It should be noted that, be provided with some protection devices between vehicle battery system VBAT and the input IN of steady voltage chip U1, like electrostatic capacity and TVS pipe, IN addition have an electrolytic capacitor to be used for the energy storage (not shown IN the figure), the embodiment of the utility model provides a specifically contain components and parts and relation of connection do not restrict between input IN to vehicle battery system VBAT and steady voltage chip U1, here do not have IN redundant description.
On the basis of the above embodiment, the embodiment of the present invention further provides an automobile seat fan, fig. 7 is a schematic structural diagram of the automobile seat fan provided by the embodiment of the present invention, as shown in fig. 7, the automobile seat fan includes a PCB circuit board 51 and a fan device 52, the PCB circuit board 51 includes the fan control circuit 10 of the above embodiment; the fan device 52 includes fan blades 521, an upper housing 522 and a base housing 523, the upper housing 522 is connected to the base housing 523 by a snap, and the fan blades 521 are disposed in the upper housing 522 and the base housing 523; the PCB 51 is fixed to a side of the base housing 523 of the fan apparatus 52 near the fan blade 521. Optionally, a metal ring 5231 is disposed in the middle of the base housing 523, and the PCB circuit board 51 is fixed to an end of the base housing 523 close to the fan blade 521 through the metal ring 5231.
The embodiment of the utility model provides a car seat fan has the embodiment of telling on through setting up in car seat fan control circuit's fan, has strengthened the protection effect to the fan, prolongs the live time of fan.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "electrically connected" are to be construed broadly, e.g., as meaning either a fixed electrical connection, a removable electrical connection, or an integral electrical connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above description is only for the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, but that the features of the various embodiments of the invention may be partially or fully coupled to each other or combined and may cooperate with each other and be technically driven in various ways. Numerous obvious variations, rearrangements, combinations, and substitutions will now occur to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A fan control circuit is characterized by comprising a Hall acquisition circuit, a single chip microcomputer and a fan motor driving circuit;
the fan motor driving circuit comprises a driving signal receiving end, the Hall signal output end is electrically connected with the Hall signal receiving end, and the driving signal output end is electrically connected with the driving signal receiving end;
the single chip microcomputer further comprises a control module, and the control module is used for controlling the driving signal output end to stop outputting the driving signal when the Hall count received by the Hall signal receiving end is kept unchanged within the preset time.
2. The fan control circuit of claim 1 wherein the drive signal outputs comprise a first drive signal output, a second drive signal output, a third drive signal output, and a fourth drive signal output;
the fan motor driving circuit comprises a fan driving coil, a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; the fan drive coil includes a first end and a second end; the first switch tube is arranged between the first driving signal output end and the first end in series, the second switch tube is arranged between the second driving signal output end and the second end in series, the third switch tube is arranged between the third driving signal output end and the first end in series, and the fourth switch tube is arranged between the fourth driving signal output end and the second end in series;
the control module is used for controlling at least one signal output end of the first driving signal output end and the fourth driving signal output end to stop outputting driving signals and/or controlling at least one signal output end of the second driving signal output end and the third driving signal output end to stop outputting driving signals when the Hall count received by the Hall signal receiving end is kept unchanged within preset time.
3. The fan control circuit according to claim 1, wherein the hall collection circuit further comprises a hall chip, a first power supply, a first capacitor, a second capacitor, a first resistor, and a second resistor;
the power supply input end of the Hall chip is electrically connected with the first power supply, the grounding end of the Hall chip is grounded, the signal output end of the Hall chip is electrically connected with the first end of the first resistor, and the second end of the first resistor is electrically connected with the power supply input end of the Hall chip;
the first end of the first capacitor is electrically connected with the power input end of the Hall chip, and the second end of the first capacitor is grounded;
the first end of the second resistor is electrically connected with the signal output end of the Hall chip, and the second end of the second resistor is the Hall signal output end of the Hall acquisition circuit and is electrically connected with the Hall signal receiving end of the singlechip;
and the first end of the second capacitor is electrically connected with the second end of the second resistor, and the second end of the second capacitor is grounded.
4. The fan control circuit of claim 1 further comprising a temperature acquisition circuit comprising a thermistor and a first voltage signal output; the single chip microcomputer further comprises a first voltage signal receiving end, and the first voltage signal output end is electrically connected with the first voltage signal receiving end;
the control module is further used for controlling the driving signal output end to stop outputting the driving signal when the voltage value received by the first voltage signal receiving end is larger than a preset voltage value; the preset voltage value corresponds to the warning temperature of the fan control circuit during working.
5. The fan control circuit according to claim 4, wherein the temperature acquisition circuit further comprises a second power supply, a third resistor and a fourth resistor, a first end of the third resistor is electrically connected to the second power supply, a second end of the third resistor is electrically connected to the first end of the thermistor, a second end of the thermistor is grounded, a first end of the fourth resistor is electrically connected to the second end of the third resistor, and a second end of the fourth resistor is the first voltage signal output end and is electrically connected to the first voltage signal receiving end in the single chip microcomputer.
6. The fan control circuit according to claim 5, further comprising a third capacitor, wherein a first terminal of the third capacitor is electrically connected to a second terminal of the fourth resistor, and a second terminal of the third capacitor is grounded.
7. The fan control circuit of claim 4 wherein the thermistor comprises a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
8. The fan control circuit according to claim 1, further comprising a voltage acquisition circuit, wherein the voltage acquisition circuit comprises a second voltage signal output terminal, the single chip further comprises a second voltage signal receiving terminal, and the second voltage signal output terminal is electrically connected to the second voltage signal receiving terminal;
the control module is used for controlling the driving signal output end to stop outputting the driving signal when the voltage value received by the second voltage signal receiving end exceeds a preset range.
9. The fan control circuit of claim 8 wherein the voltage acquisition circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, and a fourth capacitor;
a first end of the fifth resistor is electrically connected with a vehicle battery system, a second end of the fifth resistor is electrically connected with a first end of the sixth resistor, and a second end of the sixth resistor is grounded;
a first end of the seventh resistor is electrically connected with a second end of the fifth resistor, and the second end of the seventh resistor is the second voltage signal output end and is electrically connected with a second voltage signal receiving end of the singlechip;
and the first end of the fourth capacitor is electrically connected with the second end of the seventh resistor, and the second end of the fourth capacitor is grounded.
10. A car seat fan comprising a PCB circuit board and a fan assembly, the PCB circuit board including the fan control circuit of any of claims 1-9;
the fan device comprises fan blades, an upper shell and a base shell, wherein the upper shell is connected with the base shell through a buckle, and the fan blades are arranged in the upper shell and the base shell;
the PCB is fixed on one side of the base shell of the fan device, which is close to the fan blades.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020877563.XU CN212654247U (en) | 2020-05-22 | 2020-05-22 | Fan control circuit and car seat fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020877563.XU CN212654247U (en) | 2020-05-22 | 2020-05-22 | Fan control circuit and car seat fan |
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| CN212654247U true CN212654247U (en) | 2021-03-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359028A (en) * | 2021-06-02 | 2021-09-07 | 广州极飞科技股份有限公司 | Motor operation detection method and device, storage medium and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359028A (en) * | 2021-06-02 | 2021-09-07 | 广州极飞科技股份有限公司 | Motor operation detection method and device, storage medium and electronic equipment |
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