A fan and control circuit

Abstract

The application discloses a fan and a control circuit thereof, the control circuit of the fan comprises a power supply unit, a control unit, a signal receiving unit, an angle measuring unit and a driving unit which are electrically connected with the power supply unit respectively; the control unit comprises a first control chip U1, the signal receiving unit is used for receiving an angle setting signal sent by a remote controller, the angle measuring unit is used for measuring a rotating angle of the fan, and the driving unit is used for realizing forward and reverse rotation of the fan; the signal receiving unit receives the angle setting signal and feeds back to the control unit; the control unit acquires angle information fed back by the angle measuring unit at the moment when the angle setting signal is received, and controls the working of the driving unit according to the angle information; the control circuit of the fan provided by the application can set the swing range of the fan according to the requirement of a customer by cooperation of the signal receiving unit, the control unit and the angle measuring unit, and the use experience of a user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a fan and a control circuit. BACKGROUND

[0002] As a common household appliance, the electric fan has the advantage of low power consumption. In the hot summer, the electric fan is used in general households to accelerate air circulation, play a role of cooling and air circulation, and improve human comfort.

[0003] The existing electric fan generally has a swing function, but the swing range is fixed, that is, the swing angle is fixed. When the number of users is small, if the blowing is performed in a fixed mode, some users cannot be blown. If the blowing is performed in a swing mode, the rotation area is too large, and some areas in the rotation area do not have users. The time for the electric fan to rotate a cycle is long, which leads to a long waiting time for blowing of the users, and reduces the user experience.

[0004] It can be seen that the prior art needs to be improved and improved. SUMMARY

[0005] In view of the shortcomings of the prior art, the purpose of the present application is to provide a fan and a control circuit. Through the cooperation of the signal receiving unit, the control unit and the angle measuring unit, the swing range of the fan can be set according to the customer demand, and the user experience is improved.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A control circuit of a fan, comprising a power supply unit and a control unit, a signal receiving unit, an angle measuring unit and a driving unit electrically connected with the power supply unit respectively; the control unit comprises a first control chip U1, the signal receiving unit is used for receiving an angle setting signal sent by a remote controller, the angle measuring unit is used for measuring the rotation angle of the fan, and the driving unit is used for realizing the forward and reverse rotation of the fan; the signal receiving unit receives the angle setting signal and feeds back to the control unit; the control unit acquires the angle information fed back by the angle measuring unit at the moment when the angle setting signal is received, and controls the work of the driving unit according to the angle information.

[0008] In the control circuit of the fan, the signal receiving unit comprises an infrared triode M1, the pin 1 of the infrared triode M1 is connected with the power supply unit, and the pin 2 of the infrared triode M1 is connected with the pin 12 of the first control chip U1.

[0009] The angle measuring unit of the fan control circuit comprises a second resistor R2 and an adjustable angle sensor RV1, one end of the second resistor R2 is connected with the power supply unit, the other end of the second resistor R2 is connected with the adjustable angle sensor RV1, and the adjustable angle sensor RV1 is further connected with the pin 1 of the first control chip U1.

[0010] The driving unit of the fan control circuit comprises a forward-reverse driving unit, the forward-reverse driving unit comprises a first direct current motor M1, a first triode Q1, a second triode Q2, a first relay K1 and a second relay K2, the base of the first triode Q1 is connected with the pin 25 of the first control chip U1, the collector of the first triode Q1 is connected with the first relay K1, the base of the second triode Q2 is connected with the pin 26 of the first control chip U1, the collector of the second triode Q2 is connected with the second relay K2, and the first relay K1 and the second relay K2 are respectively connected with the first direct current motor M1.

[0011] The signal receiving unit of the fan control circuit can further receive a gear shifting signal sent by a remote controller, the driving unit further comprises a strength conversion unit, the strength conversion unit is used for adjusting the strength of the air volume output by the fan, and the strength conversion unit is electrically connected with the first control chip U1.

[0012] The strength conversion unit of the fan control circuit comprises a second direct current motor M2, a third triode Q3, a fourth triode Q4, a fifth triode Q5, a third relay K3, a fourth relay K4 and a fifth relay K5, the base of the third triode Q3 is connected with the pin 21 of the first control chip U1, the collector of the third triode Q3 is connected with the third relay K3, the base of the fourth triode Q4 is connected with the pin 22 of the first control chip U1, the collector of the fourth triode Q4 is connected with the fourth relay K4, the base of the fifth triode Q5 is connected with the pin 23 of the first control chip U1, the collector of the fifth triode Q5 is connected with the fifth relay K5, and the third relay K3, the fourth relay K4 and the fifth relay K5 are respectively connected with the second direct current motor M2.

[0013] The application further provides a fan, which comprises a base and a rotatable fan head arranged on the top of the base, a PCB board is arranged in the base, the fan control circuit described above is printed on the PCB board, a forward-reverse mechanism for realizing the forward-reverse rotation of the fan head is arranged on one side of the fan head, an angle sensor for measuring the rotation angle of the fan head is arranged on the bottom of the fan head, and the forward-reverse mechanism and the angle sensor are electrically connected with the PCB board respectively.

[0014] The fan, the positive and negative rotation mechanism comprises a rocker mechanism, a first direct current motor, a first gear and a second gear, the first direct current motor is connected with the first gear, the first gear and the second gear are engaged, the second gear is connected with one end of the rocker mechanism, and the other end of the rocker mechanism is connected with the base.

[0015] The fan further comprises a central shaft and a connecting plate, a through hole is formed in the connecting plate, and the angle sensor is connected with the central shaft through the through hole.

[0016] Beneficial effects:

[0017] The application provides a fan and a control circuit, the control circuit of the fan comprises a signal receiving unit, a control unit, an angle measuring unit and a driving unit; the cooperation of the signal receiving unit, the control unit and the angle measuring unit enables a user to set the swing range of the fan according to individual needs, and the cooperation of the control unit, the angle measuring unit and the driving unit enables the fan to rotate within the angle range set by the user, thereby improving the practicability of the fan and the use experience of the user. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structural schematic diagram of the control circuit of the fan provided by the application is provided.

[0019] Figure 2 A circuit structural diagram of the control unit provided by the application is provided.

[0020] Figure 3 A circuit structural diagram of the signal receiving unit provided by the application is provided.

[0021] Figure 4 A circuit structural diagram of the angle measuring unit provided by the application is provided.

[0022] Figure 5 A circuit structural diagram of the positive and negative rotation driving unit provided by the application is provided.

[0023] Figure 6 A circuit structural diagram of the strength conversion unit provided by the application is provided.

[0024] Figure 7 A structural schematic diagram of the fan provided by the application is provided.

[0025] Figure 8 A structural schematic diagram of the fan head provided by the application is provided.

[0026] Figure 9 An enlarged view of part A provided by the application is provided.

[0027] Main element symbol explanation: 1-base, 2-fan head, 31-first DC motor, 32-first gear, 33-second gear, 34-rocker mechanism, 4-angle sensor, 5-connection plate, 51-through hole, 6-center shaft. DETAILED DESCRIPTION

[0028] The present application provides a fan and a control circuit, in order to make the purpose, technical scheme and effect of the present application more clear and definite, the present application is further described in detail below with reference to the drawings and examples.

[0029] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and cannot be understood as a limitation on the present application; in addition, the terms "mounting", "connecting" and the like should be understood broadly, and for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Please refer to Figures 1 to 6 The present application provides a control circuit of a fan, comprising a power supply unit and a control unit, a signal receiving unit, an angle measuring unit and a driving unit electrically connected with the power supply unit respectively, the signal receiving unit, the angle measuring unit and the driving unit are electrically connected with the control unit respectively; the control unit comprises a first control chip U1, the signal receiving unit is used for receiving the angle setting signal sent by the remote controller, the angle measuring unit is used for measuring the rotation angle of the fan, and the driving unit is used for realizing the forward and reverse rotation of the fan; the signal receiving unit receives the angle setting signal and feeds back to the control unit; the control unit acquires the angle information fed back by the angle measuring unit at the moment when the angle setting signal is received, and controls the working of the driving unit according to the angle information; the power supply unit is the prior art, and the power supply unit can be but is not limited to a power supply chip with model number SM7095-12.

[0031] The control circuit of the fan provided by the present application receives various signals sent by the remote controller through the signal receiving unit, when the signal receiving unit receives the angle setting signal sent by the remote controller and feeds back to the control unit, the control unit acquires the angle information fed back by the angle measuring unit at this moment, and sets the angle information at this moment as the left limit angle or the right limit angle of the fan head range; in the subsequent working process of the fan, the control unit acquires the angle information fed back by the angle measuring unit in real time, when the head angle of the fan is consistent with the left limit angle or the right limit angle, the control unit outputs the control signal to the driving unit, and the driving unit realizes the forward and reverse rotation of the fan, so that the fan rotates in the angle range set by the user, that is, the user can adjust the head range of the fan according to personal needs, and improve the user experience.

[0032] Please refer to Figure 2 In one embodiment, the first control chip U1 is STC12C5A60S2 single-chip microcomputer, which has the advantages of low power consumption, fast running speed and strong anti-interference, and the single-chip microcomputer of this model integrates 2-way PWM and 8-way 10-bit A / D conversion, can directly measure the voltage output by the angle measurement unit and convert it into a digital signal to perform voltage and angle conversion.

[0033] Further, please refer to Figure 2 The control unit further comprises a clock circuit for generating a clock signal, the clock circuit comprising a first capacitor C1, a second capacitor C2 and a first crystal oscillator X1, one end of the first capacitor C1 and the second capacitor C2 being grounded, the other end of the first capacitor C1 being connected with one end of the first crystal oscillator X1 and a pin 19 of the first control chip U1 respectively, and the other end of the first capacitor C2 being connected with the other end of the first crystal oscillator X1 and a pin 18 of the first control chip U1 respectively.

[0034] Further, please refer to Figure 3 The signal receiving unit comprises an infrared triode M1, a pin 1 of the infrared triode M1 being connected with the power supply unit, a pin 2 of the infrared triode M1 being connected with a pin 12 of the first control chip U1, and a pin 3 of the infrared triode M1 being grounded; the infrared triode M1 is used for receiving the infrared signal emitted by the remote controller and feeding back to the control unit.

[0035] Further, please refer to Figure 4 The angle measurement unit comprises a second resistor R2 and an adjustable angle sensor RV1, one end of the second resistor R2 being connected with the power supply unit, the other end of the second resistor R2 being connected with the adjustable angle sensor RV1, and the adjustable angle sensor RV1 being further connected with a pin 1 of the first control chip U1.

[0036] When the fan is in the swing mode, the sliding sheet of the adjustable angle sensor RV1 is moved by the fan head, the resistance of the adjustable angle sensor RV1 changes, and the voltage signal output by the angle measurement unit changes; the voltage signal output by the angle measurement unit is an analog voltage signal, the control unit has an AD conversion channel, and the analog voltage signal output by the angle measurement unit can be converted into a digital signal; when the swing angle of the fan head is 0, i.e. the central axis of the fan head is parallel to the central axis of the base, the voltage of the voltage signal output by the angle measurement unit is V ANG =25V / 11; when the control unit detects that the voltage V X of the voltage signal output by the angle measurement unit is greater than 25V / 11, it indicates that the fan head is left-biased relative to the center, i.e. the fan head swings to the left, and the swing angle When the control unit detects the voltage V of the voltage signal outputted by the angle measuring unit X When the voltage V of the voltage signal outputted by the angle measuring unit is 25V / 11, it indicates that the fan head is right-biased relative to the center position, i.e. the fan head swings rightward, and the swing angle is The angle measuring unit outputs a voltage signal. After receiving the voltage signal feedbacked by the angle measuring unit, the control unit confirms the rotation direction of the fan head according to the size of the voltage signal, and calculates the rotation angle of the fan head.

[0037] Further, referring to Figure 5 The driving unit comprises a forward-reverse driving unit; the forward-reverse driving unit comprises a first direct current motor M1, a first triode Q1, a second triode Q2, a first relay K1 and a second relay K2; the base of the first triode Q1 is connected with pin 25 of the first control chip U1, the collector of the first triode Q1 is connected with the first relay K1, the base of the second triode Q2 is connected with pin 26 of the first control chip U1, the collector of the second triode Q2 is connected with the second relay K2, and the first relay K1 and the second relay K2 are respectively connected with the first direct current motor M1.

[0038] Further, referring to Figure 5 The forward-reverse driving unit further comprises a first diode D1, a second diode D2, a third resistor R3 and a fourth resistor R4; the third resistor R3 is arranged between the base of the first triode Q1 and pin 25 of the first control chip U1, and functions to limit the base current of the first triode Q1; the fourth resistor R4 is arranged between the second triode Q2 and pin 26 of the first control chip U1, and functions to limit the base current of the second triode Q2; the first diode D1 is connected in parallel with the first relay K1, and functions to protect the coil of the first relay K1; the second diode D2 is connected in parallel with the second relay K2, and functions to protect the coil of the second relay K2.

[0039] Before the user sets the required fan head swing angle range, the control unit defaults the fan head swing angle range to a left limit angle of 30° and a right limit angle of 30°; when the fan starts to work, the control unit controls pin 25 to output high level 1 and pin 26 to output low level 0, the first triode Q1 in the positive and negative rotation driving unit is saturated and turned on, and the second triode Q2 is cut off, so as to control the first direct current motor to rotate positively, and the fan head rotates to the left; the control unit receives the angle information fed back by the angle measuring unit in real time, when the fan head rotates to the default left limit angle of 30°, the control unit controls pin 25 to output low level 0 and pin 26 to output high level 1, the first triode Q1 in the positive and negative rotation driving unit is cut off, and the second triode Q2 is saturated and turned on, so as to control the first direct current motor to rotate reversely, and the fan head rotates to the right; the control unit receives the angle information fed back by the angle measuring unit in real time, when the fan head rotates to the default right limit angle of 30°, the control unit controls pin 25 to output high level 1 and pin 26 to output low level 0, so as to control the fan head to rotate positively, and the fan head rotates to the left; through the above process, the left and right reciprocating motion of the fan head is realized.

[0040] When the user needs to adjust the fan head swing angle range, the left limit angle setting signal or the right limit angle setting signal can be sent to the signal receiving unit through the remote controller, and the left limit button and the right limit button are correspondingly arranged on the remote controller; when the left limit button is pressed, the remote controller sends the left limit angle setting signal to the signal receiving unit; when the right limit button is pressed, the remote controller sends the right limit angle setting signal to the signal receiving unit.

[0041] When the signal received by the signal receiving unit is the left limit angle setting signal, the control unit controls the pin 25 and the pin 26 to output low level 0, the first triode Q1 and the second triode Q2 in the positive and negative rotation driving unit are cut off, and the fan head stops rotating; the control unit obtains the voltage information corresponding to the angle fed back by the angle measuring unit, and calculates the offset angle of the fan head at this time according to the voltage information, and sets the offset angle as the left limit angle; after the setting is completed, the control unit controls the pin 25 to output low level 0 and the pin 26 to output high level 1, the first triode Q1 in the positive and negative rotation driving unit is cut off, and the second triode Q2 is turned on, so as to control the first direct current motor to reverse, and the fan head starts to rotate to the right; when the signal received by the signal receiving unit is the right limit angle setting signal, the control unit controls the pin 25 and the pin 26 to output low level 0, the first triode Q1 and the second triode Q2 in the positive and negative rotation driving unit are cut off, and the fan head stops rotating; the control unit obtains the voltage information corresponding to the angle fed back by the angle measuring unit, and calculates the offset angle of the fan head at this time according to the voltage information, and sets the offset angle as the right limit angle; after the setting is completed, the control unit controls the pin 25 to output high level 1 and the pin 26 to output low level 0, the first triode Q1 in the positive and negative rotation driving unit is saturated and turned on, and the second triode Q2 is cut off, so as to control the first direct current motor to rotate forward, and the fan head rotates to the left; the subsequent swing angle range of the fan is between the set left limit angle and the right limit angle, when reaching the left limit angle, the control unit controls the first direct current motor in the positive and negative rotation driving unit to reverse, and when reaching the right limit angle, the control unit controls the first direct current motor in the positive and negative rotation driving unit to rotate forward, so that the fan can rotate in the swing angle range set by the user, and the practicability of the fan and the use experience of the user are improved.

[0042] Further, please refer to Figure 6 The signal receiving unit can also receive the gear shifting signal sent by the remote controller, the driving unit further comprises a strength conversion unit, the strength conversion unit is used for adjusting the strength of the air volume output by the fan, and the strength conversion unit is electrically connected with the first control chip U1.

[0043] Further, please refer to Figure 6The intensity conversion unit comprises a second direct current motor M2, a third triode Q3, a fourth triode Q4, a fifth triode Q5, a third relay K3, a fourth relay K4 and a fifth relay K5; the base of the third triode Q3 is connected with pin 21 of the first control chip U1, and the collector of the third triode Q3 is connected with the third relay K3; the base of the fourth triode Q4 is connected with pin 22 of the first control chip U1, and the collector of the fourth triode Q4 is connected with the fourth relay K4; the base of the fifth triode Q5 is connected with pin 23 of the first control chip U1, and the collector of the fifth triode Q5 is connected with the fifth relay K5; the third relay K3, the fourth relay K4 and the fifth relay K5 are respectively connected with the second direct current motor M2.

[0044] Further, please refer to Figure 6 The intensity conversion unit further comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third diode D3, a fourth diode D4 and a fifth diode D5; the fifth resistor R5 is arranged between the base of the third triode Q3 and pin 21 of the first control chip U1, and functions to limit the base current of the third triode Q3; the sixth resistor R6 is arranged between the base of the fourth triode Q4 and pin 22 of the first control chip U1, and functions to limit the base current of the fourth triode Q4; the seventh resistor R7 is arranged between the fifth triode Q5 and pin 23 of the first control chip U1, and functions to limit the base current of the fifth triode Q5; the third diode D3 is connected in parallel with the third relay K3, and functions to protect the coil of the third relay K3; the fourth diode D4 is connected in parallel with the fourth relay K4, and functions to protect the coil of the fourth relay K4; the fifth diode D5 is connected in parallel with the fifth relay K5, and functions to protect the coil of the fifth relay K5.

[0045] When the user needs to adjust the size of the air volume output by the fan, i.e. when the user needs to shift gears, the user can send a gear shifting signal to the signal receiving unit through the remote controller; the gear shifting signal comprises a high gear wind signal, a middle gear wind signal and a low gear wind signal, and the remote controller is correspondingly provided with a high gear wind button, a middle gear wind button and a low gear wind button; when the user presses the high gear wind button, the remote controller sends the high gear wind signal to the signal receiving unit; when the user presses the middle gear wind button, the remote controller sends the middle gear wind signal to the signal receiving unit; and when the user presses the low gear wind button, the remote controller sends the low gear wind signal to the signal receiving unit.

[0046] When the signal received by the signal receiving unit and fed back to the control unit is a strong wind signal, the first control chip U1 controls pin 21 to output high level 1 and controls pins 22 and 23 to output low level 0, the third transistor Q3 in the intensity conversion unit is saturated and turned on, the fourth transistor Q4 and the fifth transistor Q5 are cut off, the switch of the third relay K3 is closed, the switches of the fourth relay K4 and the fifth relay K5 are opened, the second DC fan controls the fan speed to keep at the first speed, and the fan outputs strong wind; when the signal received by the signal receiving unit and fed back to the control unit is a medium wind signal, the first control chip U1 controls pin 22 to output high level 1 and controls pins 21 and 23 to output low level 0, the fourth transistor Q4 in the intensity conversion unit is saturated and turned on, the third transistor Q3 and the fifth transistor Q5 are cut off, the switch of the fourth relay K4 is closed, the switches of the third relay K3 and the fifth relay K5 are opened, the second DC fan controls the fan speed to keep at the second speed, and the fan outputs medium wind; when the signal received by the signal receiving unit and fed back to the control unit is a weak wind signal, the first control chip U1 controls pin 23 to output high level 1 and controls pins 21 and 22 to output low level 0, the fifth transistor Q5 in the intensity conversion unit is saturated and turned on, the third transistor Q3 and the fourth transistor Q4 are cut off, the switch of the fifth relay K5 is closed, the switches of the third relay K3 and the fourth relay K4 are opened, the second DC fan controls the fan speed to keep at the third speed, and the fan outputs weak wind; the first speed is greater than the second speed, and the second speed is greater than the third speed; through the above process, the user can adjust the size of the wind output by the fan according to personal needs, and improve the user experience.

[0047] Please refer to Figures 7 to 9 The application also correspondingly provides a fan, which comprises a base 1 and a rotatable fan head 2 arranged on the top of the base 1, a PCB board is arranged in the base 1, the fan control circuit is printed on the PCB board, a forward-reverse mechanism for realizing the forward and reverse rotation of the fan head 2 is arranged on one side of the fan head 2, an angle sensor 4 for measuring the rotation angle of the fan head 2 is arranged at the bottom of the fan head 2, and the forward-reverse mechanism and the angle sensor 4 are electrically connected with the PCB board respectively.

[0048] Further, a second DC motor is also arranged in the base 1, the second DC motor is connected with the fan head, the second DC motor is used for adjusting the speed of the fan, so that the adjustment of the wind output intensity of the fan is realized, the second DC motor is electrically connected with the PCB board, the second DC motor is controlled by the intensity conversion unit in the fan control circuit, and the adjustment of the wind output intensity of the fan is realized.

[0049] Further, please refer to Figure 8The forward-reverse mechanism comprises a rocker mechanism 34, a first direct current motor 31, a first gear 32 and a second gear 33, the first direct current motor 31 is connected with the first gear 32, the first gear 32 and the second gear 33 are engaged, the second gear 33 is connected with one end of the rocker mechanism 34, and the other end of the rocker mechanism 34 is connected with the base 1; the first direct current motor 31 is electrically connected with the PCB board.

[0050] The forward-reverse of the first direct current motor 31 is realized by the control of the forward-reverse driving unit in the control circuit of the fan, the forward-reverse of the first direct current motor 31 drives the forward-reverse of the first gear 32, the first gear 32 and the second gear 33 are engaged, the first gear 32 drives the forward-reverse of the second gear 33, and the movement of the rocker mechanism 34 is driven by the second gear 33, that is, the second gear 33 drives the rocker mechanism 34 to realize the left-right swing of the fan head 2; in an embodiment, the first gear 32 is a pinion, the second gear 33 is a gear wheel, and the rocker mechanism 34 is a mechanism that can realize the rotation of the fan head 2 in the prior art, which is not described herein.

[0051] Further, referring to Figure 9 The fan further comprises a central shaft 6 and a connecting plate 5, the connecting plate 5 is provided with a through hole 51, and the angle sensor 4 is connected with the central shaft 6 through the through hole 51; the angle sensor 4 is a ring-shaped adjustable resistance sensor, and the angle sensor 4 comprises an adjustable resistor, the central shaft 6 is connected with a slide of the adjustable resistor of the angle sensor 4 through the through hole 51; the central shaft rotates with the rotation of the fan head, and when the central shaft rotates, the slide is driven to move, so as to realize the adjustment of the resistance of the angle sensor 4, thereby causing the corresponding change of the output signal of the angle sensor 4, and the control unit on the PCB board confirms the deviation direction of the fan head 2 relative to the central shaft 6 and calculates the deviation angle of the fan head 2 relative to the central shaft 6 according to the signal output by the angle sensor 4.

[0052] It can be understood that, for those skilled in the art, equivalent replacements or changes can be made according to the technical solutions and the inventive concept of the present application, and all these changes or replacements shall belong to the protection scope of the present application.

Claims

1. A control circuit of a fan comprising a power supply unit, characterized by, It also includes a control unit, a signal receiving unit, an angle measuring unit and a driving unit electrically connected with the power supply unit respectively; the control unit includes a first control chip U1, the signal receiving unit is used for receiving the angle setting signal sent by the remote controller, the angle measuring unit is used for measuring the rotation angle of the fan, and the driving unit is used for realizing the forward and reverse rotation of the fan; the signal receiving unit receives the angle setting signal and feeds back to the control unit; the control unit acquires the angle information fed back by the angle measuring unit at the moment when the angle setting signal is received, and controls the working of the driving unit according to the angle information; the first control chip U1 is an STC12C5A60S2 single-chip microcomputer; When the signal receiving unit receives the angle setting signal sent by the remote controller and feeds back to the control unit, the control unit acquires the angle information fed back by the angle measuring unit at the moment, and sets the angle information at the moment as the left limit angle or the right limit angle of the fan head shaking range; The signal receiving unit includes an infrared triode M1, the pin 1 of the infrared triode M1 is connected with the power supply unit, the pin 2 of the infrared triode M1 is connected with the pin 12 of the first control chip U1, and the pin 3 of the infrared triode M1 is grounded; the infrared triode M1 is used for receiving the infrared signal emitted by the remote controller and feeding back to the control unit.

2. A control circuit for a fan as claimed in claim 1, characterised in that, The angle measuring unit includes a second resistor R2 and an adjustable angle sensor RV1, one end of the second resistor R2 is connected with the power supply unit, the other end of the second resistor R2 is connected with the adjustable angle sensor RV1, and the adjustable angle sensor RV1 is further connected with the pin 1 of the first control chip U1.

3. A control circuit for a fan as claimed in claim 1, characterised in that, The driving unit includes a forward and reverse driving unit; the forward and reverse driving unit includes a first direct current motor M1, a first triode Q1, a second triode Q2, a first relay K1 and a second relay K2; the base of the first triode Q1 is connected with the pin 25 of the first control chip U1, the collector of the first triode Q1 is connected with the first relay K1, the base of the second triode Q2 is connected with the pin 26 of the first control chip U1, the collector of the second triode Q2 is connected with the second relay K2, and the first relay K1 and the second relay K2 are respectively connected with the first direct current motor M1.

4. A control circuit for a fan as claimed in claim 3, characterised in that, The signal receiving unit can also receive the gear shifting signal sent by the remote controller, the driving unit further includes a strength conversion unit, the strength conversion unit is used for adjusting the intensity of the air volume output by the fan, and the strength conversion unit is electrically connected with the first control chip U1.

5. A control circuit for a fan as claimed in claim 4, wherein The strength conversion unit comprises a second direct current motor M2, a third triode Q3, a fourth triode Q4, a fifth triode Q5, a third relay K3, a fourth relay K4 and a fifth relay K5; the base of the third triode Q3 is connected with pin 21 of the first control chip U1, and the collector of the third triode Q3 is connected with the third relay K3; the base of the fourth triode Q4 is connected with pin 22 of the first control chip U1, and the collector of the fourth triode Q4 is connected with the fourth relay K4; the base of the fifth triode Q5 is connected with pin 23 of the first control chip U1, and the collector of the fifth triode Q5 is connected with the fifth relay K5; the third relay K3, the fourth relay K4 and the fifth relay K5 are connected with the second direct current motor M2 respectively.

6. A fan comprising a base and a rotatable fan head disposed on top of the base, characterized in that, The base is internally provided with a PCB board, the PCB board is printed with a control circuit of the fan as claimed in any one of claims 1-5, one side of the fan head is provided with a forward-reverse rotation mechanism for realizing forward-reverse rotation of the fan head, the bottom of the fan head is provided with an angle sensor for measuring the rotation angle of the fan head, and the forward-reverse rotation mechanism and the angle sensor are electrically connected with the PCB board respectively.

7. A fan as claimed in claim 6, wherein The forward-reverse rotation mechanism comprises a rocker mechanism, a first direct current motor, a first gear and a second gear, the first direct current motor is connected with the first gear, the first gear and the second gear are engaged, the second gear is connected with one end of the rocker mechanism, and the other end of the rocker mechanism is connected with the base.

8. A fan as claimed in any one of claims 6 or 7, wherein, Further comprising a central shaft and a connecting plate, the connecting plate is provided with a through hole, and the angle sensor is connected with the central shaft through the through hole.

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