CN219960426U

CN219960426U - Hair drier

Info

Publication number: CN219960426U
Application number: CN202321191120.5U
Authority: CN
Inventors: 杨昌良; 卢淑
Original assignee: Shenzhen Point Technology Co ltd
Current assignee: Shenzhen Point Technology Co ltd
Priority date: 2023-05-16
Filing date: 2023-05-16
Publication date: 2023-11-03
Anticipated expiration: 2033-05-16

Abstract

The utility model discloses a blower, comprising: the fan comprises a fan body, and a FOC driving circuit and an MCU which are arranged in the fan body, wherein the FOC driving circuit comprises a FOC driving chip with the model of SPE05M50T, a three-phase upper arm control signal input terminal and a three-phase lower arm control signal input terminal of the FOC driving chip are respectively connected with an output pin of the MCU, and three-phase output terminals of the FOC driving chip are respectively connected with a three-phase winding of a motor in the fan body, so that the FOC driving chip drives the motor to work according to motor control signals from the MCU. Compared with the prior art, the blower provided by the utility model has the advantages that the motor is driven by the FOC driving technology, sine wave driving is adopted, the starting noise is low, the reversing switching response of the forward and reverse rotation of the motor is faster, the rotating speed can reach 11 ten thousand revolutions per minute, the circuit structure is simple, and the whole volume of the product can be reduced.

Description

Hair drier

Technical Field

The present utility model relates to a hair dryer.

Background

The hair dryer is mainly used for drying and shaping hair, and can also be used for local drying, heating and physiotherapy in the aspects of laboratories, physiotherapy rooms, industrial production, artists and the like. At present, when the hair dryer on the market works, the performance of high motor starting rotating speed and low noise can not be achieved, namely, the hair dryer with large starting torque and high rotating speed usually has the problem of high noise, and the use experience of a user is affected.

Disclosure of Invention

The utility model aims to provide a blower capable of improving the use experience of a user.

In order to solve the above technical problems, the present utility model provides a blower, including: the fan comprises a fan body, and a FOC driving circuit and an MCU which are arranged in the fan body, wherein the FOC driving circuit comprises a FOC driving chip with the model of SPE05M50T, a three-phase upper arm control signal input terminal and a three-phase lower arm control signal input terminal of the FOC driving chip are respectively connected with an output pin of the MCU, and three-phase output terminals of the FOC driving chip are respectively connected with a three-phase winding of a motor in the fan body, so that the FOC driving chip drives the motor to work according to motor control signals from the MCU.

The further technical scheme is as follows: the blower also comprises a drive detection feedback circuit, the FOC drive circuit also comprises a second resistor, a seventh resistor and a fortieth resistor, wherein a U-phase lower arm MOSFET source terminal and a V-phase lower arm MOSFET source terminal of the FOC drive chip are respectively connected with the second resistor and the seventh resistor, the other ends of the second resistor and the seventh resistor and the W-phase lower arm MOSFET source terminal are both connected with one end of the fortieth resistor and serve as detection output ends, and the other end of the fortieth resistor is grounded;

the driving detection feedback circuit comprises three paths of detection feedback circuits, each detection feedback circuit comprises a first detection resistor, a second detection resistor and a detection capacitor, one ends of the first detection resistor and the second detection resistor are respectively connected with two ends of the detection capacitor and serve as output sides of the detection feedback circuit, the output sides of the detection feedback circuit are connected with input pins of an MCU, the other ends of the first detection resistor and the second detection resistor serve as input sides of the detection feedback circuit, one path of detection feedback circuit in the three paths of detection feedback circuits is connected with the detection output end and a U-phase lower arm MOSFET source terminal, the input sides of the other two paths of detection feedback circuits are connected with the detection output end and the V-phase lower arm MOSFET source terminal, and the other path of detection feedback circuit is connected with the detection output end and the ground.

The further technical scheme is as follows: the drive detection feedback circuit further comprises a protection detection circuit, the protection detection circuit comprises a twenty-eighth resistor and a twenty-eighth capacitor, one end of the twenty-eighth resistor is connected with the detection output end so as to collect working current of the motor, one end of the twenty-first capacitor is grounded, and the other ends of the twenty-first capacitor and the twenty-eighth resistor are connected and connected to an input pin of the MCU so as to realize overcurrent detection.

The further technical scheme is as follows: the hair dryer is still including being located the power supply circuit of hair dryer body, power supply circuit includes voltage limiter, thermistor and rectifier circuit, voltage limiter both ends are connected in live wire and the zero line of power respectively, rectifier circuit includes rectifier bridge and electrolytic capacitor, the first AC input of rectifier bridge connect the live wire with voltage limiter, its second AC input passes through the zero line is connected to thermistor, and the positive pole of electrolytic capacitor is connected to the first output of this rectifier bridge, and is regarded as power supply circuit's output, connects FOC drive circuit and MCU to for FOC drive circuit and MCU power supply, the second output of this rectifier bridge and electrolytic capacitor's negative pole ground connection.

The further technical scheme is as follows: the power supply circuit further comprises an EMC filter circuit, the EMC filter circuit comprises a first capacitor, a second capacitor and an auto-coupling inductor, the first capacitor and the second capacitor are connected in parallel between a live wire and a zero wire of a power supply, a primary winding of the auto-coupling inductor is connected between the live wire and a first alternating current input end of a rectifier bridge, and a secondary winding of the auto-coupling inductor is connected between a thermistor and a second alternating current input end of the rectifier bridge.

The further technical scheme is as follows: the power supply circuit further includes a fuse connected between the hot wire of the power supply and the voltage limiter.

The further technical scheme is as follows: the power supply circuit further comprises a voltage division detection circuit, the voltage division detection circuit comprises a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor and a fifteenth capacitor, one end of the twenty-second resistor and one end of the twenty-third resistor are connected in series, the other end of the twenty-second resistor is connected with the twenty-fifth resistor and the twenty-fourth resistor, the other end of the twenty-fourth resistor is connected with the fifteenth capacitor and is used as an output end of the voltage division detection circuit, one detection input pin of the MCU is connected, and the other ends of the twenty-fifth resistor and the fifteenth capacitor are grounded.

The further technical scheme is as follows: the power supply circuit also comprises a zero-crossing detection circuit, the zero-crossing detection circuit comprises a second photoelectric coupler, a sixteenth resistor and a seventeenth resistor, one end of an anti-parallel light-emitting diode in the second photoelectric coupler is connected with a live wire of a power supply through the seventeenth resistor and the sixteenth resistor which are connected in series, the other end of the anti-parallel light-emitting diode is connected to a zero line of the power supply, a collector electrode of a triode in the second photoelectric coupler is connected with a zero-crossing detection input pin of the MCU, and an emitter electrode of the triode is grounded.

The further technical scheme is as follows: the hair dryer also comprises a heating control circuit, wherein the heating control circuit comprises a first bidirectional thyristor, a sixth resistor, a first photoelectric coupler and a tenth resistor, an anode of a light emitting diode in the first photoelectric coupler is connected with an output pin of the MCU through the tenth resistor, a cathode of the light emitting diode is grounded, a first main terminal and a second main terminal of the bidirectional thyristor in the first photoelectric coupler are respectively connected with a control end of the first bidirectional thyristor and the sixth resistor, the first main terminal of the first bidirectional thyristor is connected with a fire wire of a power supply, and the other end of the sixth resistor is connected with a second main terminal of the first bidirectional thyristor and is used as an output end of the heating control circuit to be connected with a heating wire in the hair dryer body.

The further technical scheme is as follows: the heating control circuit further comprises a temperature measuring circuit, the temperature measuring circuit comprises an NTC resistor, a thirty-second resistor, a thirty-sixth resistor and a twenty-second capacitor, one end of the NTC resistor is connected with the thirty-second resistor and the thirty-sixth resistor, the other end of the thirty-sixth resistor is connected with the twenty-second capacitor and is connected with an input pin of the MCU so as to input acquired temperature information to the MCU, the other ends of the NTC resistor and the twenty-second capacitor are grounded, and the other end of the thirty-second resistor is connected with a power supply VCC.

Compared with the prior art, the FOC driving circuit in the blower comprises the FOC driving chip with the model of SPE05M50T, the FOC driving chip is connected with the MCU and the motor in the blower body to drive the motor to work according to the motor control signal from the MCU, and the blower is characterized in that the motor is driven by the FOC driving technology, sine wave driving is adopted, starting noise is low, reversing switching response of forward and reverse rotation of the motor is faster, the rotating speed can reach 11 ten thousand revolutions per minute, the circuit structure is simple, and the whole volume of the product can be reduced.

Drawings

Figure 1 is a schematic block diagram of an embodiment of a blower of the present utility model.

Fig. 2 is a schematic diagram of the circuit configuration of the FOC driving circuit and the driving detection feedback circuit in the blower of the present utility model.

Fig. 3 is a schematic circuit structure diagram of the MCU and the temperature measuring circuit in the blower of the present utility model.

Fig. 4 is a schematic circuit configuration diagram of a power supply circuit, a heat generation control circuit, and a zero-crossing detection circuit in the blower of the present utility model.

Detailed Description

The present utility model will be further described with reference to the drawings and examples below in order to more clearly understand the objects, technical solutions and advantages of the present utility model to those skilled in the art.

Referring to fig. 1-4, fig. 1-4 illustrate an embodiment of the hair dryer of the present utility model. In the embodiment shown in the drawings, the blower comprises a blower body, a FOC driving circuit 12 and an MCU U4, wherein the FOC driving circuit 12 comprises a FOC driving chip 121 with a model of SPE05M50T, preferably, the model of the MCU U4 is LKS32MCR11C6T8, in this embodiment, the three-phase upper arm control signal input terminal and the three-phase lower arm control signal input terminal of the FOC driving chip 121 are respectively connected to the output pins of the MCU U4, i.e. the U-phase upper arm control signal input terminal, the V-phase upper arm control signal input terminal, the W-phase upper arm control signal input terminal and the U-phase lower arm control signal input terminal of the FOC driving chip 121 are respectively connected to the six output pins (pin 27, pin 29, pin 31, pin 28, pin 30 and pin 32) of the MCU U4, and the three-phase output terminals of the FOC driving chip 121 are respectively connected to the three-phase winding motor 101 in the blower body, so that the FOC driving chip 121 is connected to the three-phase motor winding 101 according to the output signals of the output terminals of the MCU 101, i.e. the output terminals of the three-phase motor 101, the output terminals of the output chip 101, and the output terminals of the output from the output terminals of the MCU 101. Understandably, the blower body is a blower commonly used in the art, and includes a housing, an air inlet and an air outlet formed in the housing, and a motor 101, a heating wire 102, a voltage reducing circuit, etc. which are located in the housing, and are not described herein. Based on the design, the blower provided by the utility model uses the FOC driving technology to drive the motor 101, sine wave driving is adopted, starting noise is low, reversing switching response of forward and reverse rotation of the motor 101 is faster, the rotating speed can reach 11 ten thousand revolutions per minute, the circuit structure is simple, the whole volume of the product can be reduced, and possibility is provided for beautifying the structure of the blower.

Specifically, as shown in fig. 2, the U-phase upper arm control signal input terminal of the FOC driving chip 121 is connected to the pin 27 of the MCUU4 through an RC circuit formed by a thirty-fifth resistor R35 and a twenty-sixth capacitor C26; the V-phase upper arm control signal input terminal is connected with a pin 29 of the MCU U4 after passing through an RC circuit formed by a thirty-first resistor R30 and a twenty-eighth capacitor C28; the W-phase upper arm control signal input terminal is connected with a pin 31 of the MCU U4 after passing through an RC circuit formed by a thirty-eighth resistor R38 and a twenty-third capacitor C23; the U-phase lower arm control signal input terminal is connected with a pin 28 of the MCU U4 after passing through an RC circuit formed by a thirty-seventh resistor R37 and a twenty-fourth capacitor C24; the V-phase lower arm control signal input terminal is connected with a pin 30 of the MCUU4 after passing through an RC circuit formed by a thirty-fourth resistor R34 and a twenty-seventh capacitor C27; the W-phase lower arm control signal input terminal is connected with the pin 32 of the MCU U4 after passing through an RC circuit formed by a thirty-ninth resistor R39 and a twenty-fifth capacitor C25.

In some embodiments, the blower further includes a driving detection feedback circuit 13, the FOC driving circuit 12 further includes a second resistor R2, a seventh resistor R7, and a fortieth resistor R40, where a U-phase lower arm MOSFET source terminal and a V-phase lower arm MOSFET source terminal of the FOC driving chip 121 are respectively connected to the second resistor R2 and the seventh resistor R7, and the other ends of the second resistor R2 and the seventh resistor R7 and the W-phase lower arm MOSFET source terminal are both connected to one end of the fortieth resistor R40, and serve as a detection output terminal i_shot, and the other end of the fortieth resistor R40 is grounded; the driving detection feedback circuit 13 includes three paths of detection feedback circuits 131, each detection feedback circuit 131 includes a first detection resistor, a second detection resistor and a detection capacitor, one end of the first detection resistor and one end of the second detection resistor are respectively connected with two ends of the detection capacitor and serve as output sides of the detection feedback circuit 131, the output sides of the detection feedback circuit 131 are connected with input pins of the MCU U4, the other end of the first detection resistor and the other end of the second detection resistor serve as input sides of the detection feedback circuit 131, the input sides of one path of detection feedback circuit 131 in the three paths of detection feedback circuits 131 are connected with the detection output ends I_shot and the U-phase lower arm MOSFET source terminals, the input sides of the other path of detection feedback circuit 131 are connected with the detection output ends I_shot and the V-phase lower arm MOSFET source terminals, and the input sides of the other path of detection feedback circuit 131 are connected with the detection output ends I_shot and the ground. Based on the design, the working current and the running speed of the motor 101 are sampled in real time through the second resistor R2, the seventh resistor R7 and the fortieth resistor R40, FOC closed-loop control is realized, and the sampling signal is transmitted to the MCU U4 after being filtered through RC integration in the detection feedback circuit 131 in the sampling process, so that the sampling signal is not interfered by external signals.

Specifically, as shown in fig. 2 and 3, in this embodiment, one path of detection feedback circuit 131 includes a first detection resistor R8, a second detection resistor R9 and a detection capacitor C14, one path of detection feedback circuit 131 includes a first detection resistor R15, a second detection resistor R18 and a detection capacitor C19, and the other path of detection feedback circuit 131 includes a first detection resistor R20, a second detection resistor R21 and a detection capacitor C20, where one ends of the first detection resistor R8 and the second detection resistor R9 are respectively connected to a pin 20 and a pin 21 of the MCU U4, and the other ends thereof are respectively connected to a source terminal of the U-phase lower arm MOSFET and a detection output terminal i_shot; one end of the first detection resistor R15 and one end of the second detection resistor R18 are respectively connected with a pin 23 and a pin 24 of the MCU U4, and the other end of the first detection resistor R15 and the other end of the second detection resistor R18 are respectively connected with a source terminal of the V-phase lower arm MOSFET and a detection output end I_shot; one end of the first detection resistor R20 and one end of the second detection resistor R21 are respectively connected with a pin 35 and a pin 36 of the MCU U4, and the other end of the first detection resistor R20 and the other end of the second detection resistor R21 are respectively connected with a detection output end I_shot and ground.

Further, the driving detection feedback circuit 13 further includes a protection detection circuit 132, where the protection detection circuit 132 includes a twenty-eighth resistor R28 and a twenty-first capacitor C21, one end of the twenty-eighth resistor R28 is connected to the detection output terminal i_shot to collect the working current of the motor 101, one end of the twenty-first capacitor C21 is grounded, and the other ends of the twenty-first capacitor C21 and the twenty-eighth resistor R28 are connected to an input pin (pin 37) of the MCU U4 to implement overcurrent detection. Based on the above design, the cooperation of the MCU U4 and the protection detection circuit 132 can detect whether the working current of the motor 101 exceeds the preset current threshold, so as to realize overcurrent detection and protection.

With continued reference to fig. 1, 3 and 4, in the embodiment shown in the drawings, the blower further includes a power supply circuit 14 located in the blower body, the power supply circuit 14 includes a voltage limiter VR1, a thermistor NTC1 and a rectifying circuit 142, a fuse F1 is connected to a live wire L of the power supply, two ends of the voltage limiter VR1 are respectively connected to the fuse F1 and a zero line N of the power supply, the rectifying circuit 142 includes a rectifying bridge BD1 and an electrolytic capacitor EC4, a first ac input end of the rectifying bridge BD1 is connected to the fuse F1, a second ac input end of the rectifying bridge BD1 is connected to the zero line N through the thermistor NTC1, a first output end of the rectifying bridge BD1 is connected to an anode of the electrolytic capacitor EC4, and as an output end of the power supply circuit 14, the FOC driving circuit 12 and the MCU U4 are connected to power supply the FOC driving circuit 12 and the MCU U4, and a second output end of the rectifying bridge BD1 and a cathode of the electrolytic capacitor EC4 are grounded. Based on the above design, the thermistor NTC1 is used as an anti-surge element, 220V ac is input, and enters the rectifying circuit 142 to perform full-bridge rectification after passing through the fuse F1, the voltage limiter VR1 and the anti-surge element, and 310V dc voltage can be obtained through energy storage and filtering of the electrolytic capacitor EC4 after passing through the rectifying bridge BD1, and the 310V dc voltage is transmitted to the FOC driving circuit 12 for driving the motor 101 on one hand, and is reduced to 15V and 5V low voltage through the voltage reducing circuit in the blower body on the other hand, so as to supply power to the MCU U4 and other driving elements.

Preferably, the power supply circuit 14 further includes an EMC filter circuit, where the EMC filter circuit includes a first capacitor CX1, a second capacitor CX2, and an auto-inductor L1, where the first capacitor CX1 and the second capacitor CX2 are connected in parallel between the fuse F1 and the zero line N of the power supply, the primary winding of the auto-inductor L1 is connected between the fuse F1 and the first ac input terminal of the rectifier bridge BD1, and the secondary winding of the auto-inductor L1 is connected between the thermistor NTC1 and the second ac input terminal of the rectifier bridge BD 1.

In some embodiments, the power supply circuit 14 further includes a voltage division detection circuit 144, where the voltage division detection circuit 144 includes a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, and a fifteenth capacitor C15, one end of the twenty-second resistor R22 and the twenty-third resistor R23 connected in series is connected to the positive electrode of the electrolytic capacitor EC4, the other end of the twenty-second resistor R25 and the twenty-fourth resistor R24 are connected to the fifteenth capacitor C15, and as an output end of the voltage division detection circuit 144, one detection input pin (pin 8) of the MCU U4 is connected to output the voltage Vbus to the MCU U4, and the other ends of the twenty-fifth resistor R25 and the fifteenth capacitor C15 are grounded. Based on the design, R22, R23, R25, R24 and C15 form a voltage dividing network, and the voltage dividing network is used as a 310V voltage acquisition network and can be matched with MCU U4 to realize voltage acquisition and detection.

In some embodiments, the power supply circuit 14 further includes a zero-crossing detection circuit 145, where the zero-crossing detection circuit 145 includes a second photo-coupler U5, a sixteenth resistor R16, and a seventeenth resistor R17, one end of the anti-parallel light emitting diode in the second photo-coupler U5 is connected between the fuse F1 and the primary winding of the self-inductor L1 through the seventeenth resistor R17 and the sixteenth resistor R16 connected in series, the other end is connected between the thermistor NTC1 and the secondary winding of the self-inductor L1, and the collector of the triode in the second photo-coupler U5 is connected to the zero-crossing detection input pin (pin 10) of the MCU U4, and the emitter thereof is grounded. Based on the design, ZERO-crossing detection of an alternating current power supply is realized through the second photoelectric coupler U5, the sixteenth resistor R16, the seventeenth resistor R17 and the MCU U4, and a ZERO-crossing detection signal ZERO is output by a collector electrode of a triode in the second photoelectric coupler U5 and is sent to the MCU U4 to serve as a basis of ZERO-crossing detection.

In some embodiments, the blower further includes a heating control circuit 15, where the heating control circuit 15 includes a first triac Q1, a sixth resistor R6, a first photo-coupler U2, and a tenth resistor R10, an anode of a light emitting diode in the first photo-coupler U2 is connected to an output pin (pin 12) of the MCU U4 through the tenth resistor R10, a cathode of the light emitting diode is grounded, a first main terminal and a second main terminal of the triac in the first photo-coupler U2 are respectively connected to a control end of the first triac Q1 and the sixth resistor R6, a first main terminal of the first triac Q1 is connected to a hot line L of a power supply, and another end of the sixth resistor R6 is connected to a second main terminal of the first triac Q1 and is used as an output end of the heating control circuit 15, as shown in fig. 4, one end heat_l of the heating wire 102 is connected to an output end of the heating control circuit 15, and another end heat_l of the heating wire is connected to a hot line of the power supply n_n of the heating control circuit 15. Preferably, the first photo-coupler U2 is a photo-coupler with a zero-crossing detection function, and the heating wire 102 is powered by the first bidirectional thyristor Q1 under the control of the MCU U4 to realize wave loss and phase balance.

Further, as shown in fig. 1 and 3, the heating control circuit 15 further includes a temperature measurement circuit 16, where the temperature measurement circuit 16 includes an NTC resistor J3, a thirty-second resistor R32, a thirty-sixth resistor R36, and a twenty-second capacitor C22, where one end of the NTC resistor J3 is connected to the thirty-second resistor R32 and the thirty-sixth resistor R36, the other end of the thirty-sixth resistor R36 is connected to the twenty-second capacitor C22, and is connected to an input pin (pin 1) of the MCU U4, so as to input the collected temperature information NTC to the MCU U4, the other ends of the NTC resistor J3 and the twenty-second capacitor C22 are grounded, and the other end of the thirty-second resistor R32 is connected to a power VCC, which in this embodiment is a +5v power supply.

With continued reference to fig. 3, in this embodiment, the blower further includes a rotation speed switching circuit, where the rotation speed switching circuit includes a twenty-sixth resistor R26, a twenty-seventh resistor R27, and a third photo-coupler U7, where one end of an anti-parallel light emitting diode in the third photo-coupler U7 is connected to an output end of the fuse F1 through the twenty-seventh resistor R27 and the twenty-sixth resistor R26 connected in series, and is connected to the motor 101 of the blower body, the other end of the anti-parallel light emitting diode in the third photo-coupler U7 is connected to a three-phase power supply, a collector of a triode in the third photo-coupler U7 is connected to a pin 9 of the MCUU4, an emitter of the triode in the third photo-coupler U7 is grounded, and further, a switching key may be further provided, where one end ol_l of the switching key is connected to the output end of the fuse F1 and the twenty-sixth resistor R26, and the other end ol_n of the switching key is connected to a zero line N of the power supply, so that the third photo-coupler U7 operates when the switching key is pressed, and outputs a motor 101 rotation speed switching signal hick 4 to the motor 101, and a motor mcuuck 4 is controlled according to whether the motor 101 is operated in a HIGH-speed switching mode or a low speed mode.

It will be appreciated that in some other embodiments, the blower of the present utility model may further include an LED display circuit connected to the MCU U4 to display the operation status of the MCU U4 in real time.

In summary, the FOC driving circuit in the blower of the present utility model includes the FOC driving chip with the model SPE05M50T, and the FOC driving chip is connected with the MCU and the motor in the blower body to drive the motor to work according to the motor control signal from the MCU, which can be known that the blower of the present utility model uses the FOC driving technology to drive the motor, adopts sine wave driving, has low starting noise, and the switching response of the motor in forward and reverse directions is faster, the rotation speed can reach 11 ten thousand revolutions per minute, and the circuit structure is simple, the whole volume of the product can be reduced, and meanwhile, the PID intelligent temperature control technology is integrated, the temperature control can be more accurate, and the wave loss + phase balance technology is adopted in the driving of the bidirectional silicon controlled rectifier, so that the interference to the power grid is greatly reduced, the product can sequentially pass through various standard authentications, and enough EMC margins are provided.

The foregoing is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Various equivalent changes and modifications can be made by those skilled in the art based on the above embodiments, and all equivalent changes or modifications made within the scope of the claims shall fall within the scope of the present utility model.

Claims

1. A hair dryer, comprising: the fan comprises a fan body, and a FOC driving circuit and an MCU which are arranged in the fan body, wherein the FOC driving circuit comprises a FOC driving chip with the model of SPE05M50T, a three-phase upper arm control signal input terminal and a three-phase lower arm control signal input terminal of the FOC driving chip are respectively connected with an output pin of the MCU, and three-phase output terminals of the FOC driving chip are respectively connected with a three-phase winding of a motor in the fan body, so that the FOC driving chip drives the motor to work according to motor control signals from the MCU.

2. A hair dryer as in claim 1, wherein: the blower also comprises a drive detection feedback circuit, the FOC drive circuit also comprises a second resistor, a seventh resistor and a fortieth resistor, wherein a U-phase lower arm MOSFET source terminal and a V-phase lower arm MOSFET source terminal of the FOC drive chip are respectively connected with the second resistor and the seventh resistor, the other ends of the second resistor and the seventh resistor and the W-phase lower arm MOSFET source terminal are both connected with one end of the fortieth resistor and serve as detection output ends, and the other end of the fortieth resistor is grounded;

3. A hair dryer as in claim 2, wherein: the drive detection feedback circuit further comprises a protection detection circuit, the protection detection circuit comprises a twenty-eighth resistor and a twenty-eighth capacitor, one end of the twenty-eighth resistor is connected with the detection output end so as to collect working current of the motor, one end of the twenty-first capacitor is grounded, and the other ends of the twenty-first capacitor and the twenty-eighth resistor are connected and connected to an input pin of the MCU so as to realize overcurrent detection.

4. A hair dryer as in claim 1, wherein: the hair dryer is still including being located the power supply circuit of hair dryer body, power supply circuit includes voltage limiter, thermistor and rectifier circuit, voltage limiter both ends are connected in live wire and the zero line of power respectively, rectifier circuit includes rectifier bridge and electrolytic capacitor, the first AC input of rectifier bridge connect the live wire with voltage limiter, its second AC input passes through the zero line is connected to thermistor, and the positive pole of electrolytic capacitor is connected to the first output of this rectifier bridge, and is regarded as power supply circuit's output, connects FOC drive circuit and MCU to for FOC drive circuit and MCU power supply, the second output of this rectifier bridge and electrolytic capacitor's negative pole ground connection.

5. A hair dryer as in claim 4, wherein: the power supply circuit further comprises an EMC filter circuit, the EMC filter circuit comprises a first capacitor, a second capacitor and an auto-coupling inductor, the first capacitor and the second capacitor are connected in parallel between a live wire and a zero wire of a power supply, a primary winding of the auto-coupling inductor is connected between the live wire and a first alternating current input end of a rectifier bridge, and a secondary winding of the auto-coupling inductor is connected between a thermistor and a second alternating current input end of the rectifier bridge.

6. A hair dryer as in claim 4, wherein: the power supply circuit further includes a fuse connected between the hot wire of the power supply and the voltage limiter.

7. A hair dryer as in claim 4, wherein: the power supply circuit further comprises a voltage division detection circuit, the voltage division detection circuit comprises a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor and a fifteenth capacitor, one end of the twenty-second resistor and one end of the twenty-third resistor are connected in series, the other end of the twenty-second resistor is connected with the twenty-fifth resistor and the twenty-fourth resistor, the other end of the twenty-fourth resistor is connected with the fifteenth capacitor and is used as an output end of the voltage division detection circuit, one detection input pin of the MCU is connected, and the other ends of the twenty-fifth resistor and the fifteenth capacitor are grounded.

8. A hair dryer as in claim 4, wherein: the power supply circuit also comprises a zero-crossing detection circuit, the zero-crossing detection circuit comprises a second photoelectric coupler, a sixteenth resistor and a seventeenth resistor, one end of an anti-parallel light-emitting diode in the second photoelectric coupler is connected with a live wire of a power supply through the seventeenth resistor and the sixteenth resistor which are connected in series, the other end of the anti-parallel light-emitting diode is connected to a zero line of the power supply, a collector electrode of a triode in the second photoelectric coupler is connected with a zero-crossing detection input pin of the MCU, and an emitter electrode of the triode is grounded.

9. A hair dryer as in claim 1, wherein: the hair dryer also comprises a heating control circuit, wherein the heating control circuit comprises a first bidirectional thyristor, a sixth resistor, a first photoelectric coupler and a tenth resistor, an anode of a light emitting diode in the first photoelectric coupler is connected with an output pin of the MCU through the tenth resistor, a cathode of the light emitting diode is grounded, a first main terminal and a second main terminal of the bidirectional thyristor in the first photoelectric coupler are respectively connected with a control end of the first bidirectional thyristor and the sixth resistor, the first main terminal of the first bidirectional thyristor is connected with a fire wire of a power supply, and the other end of the sixth resistor is connected with a second main terminal of the first bidirectional thyristor and is used as an output end of the heating control circuit to be connected with a heating wire in the hair dryer body.

10. A hair dryer as in claim 9, wherein: the heating control circuit further comprises a temperature measuring circuit, the temperature measuring circuit comprises an NTC resistor, a thirty-second resistor, a thirty-sixth resistor and a twenty-second capacitor, one end of the NTC resistor is connected with the thirty-second resistor and the thirty-sixth resistor, the other end of the thirty-sixth resistor is connected with the twenty-second capacitor and is connected with an input pin of the MCU so as to input acquired temperature information to the MCU, the other ends of the NTC resistor and the twenty-second capacitor are grounded, and the other end of the thirty-second resistor is connected with a power supply VCC.