Self-adaptive temperature control circuit of hair dryer

Abstract

The self-adaptive temperature control circuit comprises a main control unit, a distance measurement module, a temperature detection module, a heating module and a motor driving module, the distance measuring module cup is configured to measure the working distance between the air outlet of the hair dryer and the hair of a user; the temperature detection module is configured to monitor the working temperature at the air outlet of the blowing cylinder; the main control unit is configured to output a self-adaptive control signal according to the working distance and the working temperature; the heating module is configured to adjust the heating power according to the adaptive control signal; according to the structure, through cooperation of the distance measuring module and the temperature detection module, when it is detected that the distance between the air outlet and the hair of a person is close and the temperature detected by the air outlet is high, the main control unit controls the power of the heating module to be reduced, the air outlet temperature is actively reduced, and the hair and scalp are protected; when it is detected that the distance is long and the temperature is low, the power of the heating module is increased, so that the temperature of the air blown to the hair is stable, and the temperature is kept within the range where people feel comfortable.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to an adaptive temperature control circuit for a hair dryer. Background Art

[0002] Traditional hair dryers are mostly driven by AC motors, which are usually less efficient than brushless motors, which means that at the same power, AC motors may consume more energy. At the same time, AC motors usually make a lot of noise when running, while brushless motors make less noise when running, providing a quieter user experience. Although the speed regulation method of AC motors is relatively simple, the speed regulation accuracy is low, and brushless motors can achieve more precise speed regulation through more intelligent control methods. Therefore, it is expected to replace AC motors and be widely used in the application field of hair dryers. At present, some brands on the market have launched hair dryers using brushless motors, but they lack temperature control and often use fixed power gears to control the heating wire. If the hair dryer with too high temperature is too close to the scalp, it may cause scald burns. Summary of the invention

[0003] Based on this, it is necessary to provide a hair dryer adaptive temperature control circuit to address the above problems of the hair dryer.

[0004] In order to achieve the above object, an embodiment of the present invention provides a hair dryer adaptive temperature control circuit, comprising:

[0005] A main control unit, a distance measuring module, a temperature detection module, a heating module and a motor drive circuit, wherein the main control unit is electrically connected to the distance measuring module, the temperature detection module, the heating module and the motor drive circuit respectively; wherein the distance measuring module is used to measure the working distance between the air outlet of the hair dryer and the user's hair; the temperature detection module is used to monitor the working temperature at the air outlet of the hair dryer; the main control unit is used to output an adaptive control signal according to the working distance and the working temperature; the heating module is used to adjust the heating power according to the adaptive control signal; and the motor drive circuit is used to adjust the rotation speed according to the adaptive control signal.

[0006] In one embodiment, the hair dryer adaptive temperature control circuit further includes a power conversion module, the power conversion module includes a first conversion module, a second conversion module and a third conversion module, the first conversion module is configured to convert and process the received external power signal to obtain a first power supply signal; the second conversion module is configured to convert and process the received first power supply signal to obtain a second power supply signal; the third conversion module is configured to convert and process the received second power supply signal to obtain a third power supply signal;

[0007] Among them, the first power supply signal is also used to power the motor drive circuit and the main control unit, the second power supply signal is also used to power the motor drive circuit, and the third power supply signal is also used to power the ranging module, the temperature detection module, the heating module and the motor drive circuit.

[0008] In one embodiment, the first conversion module includes a fuse, a first resistor, a second resistor, a varistor, a first capacitor, a second capacitor, a third capacitor and a rectifier bridge stack, the first end of the first resistor, the first end of the varistor and the first input end of the rectifier bridge stack are connected in common and connected to the AC live wire, the second end of the fuse, the second end of the second resistor, the second end of the varistor and the second input end of the rectifier bridge stack are connected in common, the first end of the fuse is connected to the AC neutral line, the first output end of the rectifier bridge stack and the first end of the first capacitor, the first end of the second capacitor, and the first end of the third capacitor are connected in common to form a first power supply signal output end, and the second output end of the rectifier bridge stack and the second end of the first capacitor, the second end of the second capacitor, and the second end of the third capacitor are grounded in common;

[0009] In one embodiment, the second conversion module includes a first power chip, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a fourth resistor, a fifth resistor, a first inductor, a first diode, a second diode, and a third diode. Pins 5-8 of the first power chip are connected to the first end of the fourth capacitor to receive the first power supply signal. The second end of the fourth capacitor, the positive electrode of the first diode, the second end of the sixth capacitor, the positive electrode of the third diode and the second end of the seventh capacitor are connected to each other. Pin 1 of the first power chip is connected to the first end of the fourth resistor, the first end of the fifth capacitor and the negative electrode of the second diode. The positive electrode of the second diode is connected to the second end of the first inductor, the first end of the sixth capacitor, the negative electrode of the third diode and the first end of the seventh capacitor to form a second power supply signal output end. The first end of the first inductor is connected to the second end of the fifth capacitor, the negative electrode of the first diode, the second pin of the first power chip, the second end of the third resistor and the second end of the fifth resistor. The first end of the third resistor is connected to pin 4 of the first power chip, and the first end of the fifth resistor is connected to pin 3 of the first power chip.

[0010] In one embodiment, the third conversion module includes a second power supply chip, an eighth capacitor, a ninth capacitor and a tenth capacitor. The first pin of the second power supply chip is connected to the first end of the ninth capacitor and the first end of the tenth capacitor to form a third power supply signal output end. The second pin of the second power supply chip is connected to the second end of the eighth capacitor, the second end of the ninth capacitor and the second end of the tenth capacitor to a ground. The third pin of the second power supply chip is connected to the third pin of the eighth capacitor to receive the second power supply signal.

[0011] In one embodiment, the hair dryer adaptive temperature control circuit also includes a drop protection circuit, which includes an acceleration detection chip, a 30th resistor, a 31st resistor, a 32nd resistor, a 19th capacitor, a 20th capacitor, a 21st capacitor and a 22nd capacitor, the 1st pin of the acceleration detection chip is connected to the first end of the 19th capacitor, the 8th pin of the acceleration detection chip is connected to the second end of the 19th capacitor to receive a power supply signal, the 10th pin of the acceleration detection chip is connected to the first end of the 30th resistor, the 11th pin of the acceleration detection chip is connected to the first end of the 20th capacitor, and the 21st pin of the 30th resistor is connected to the second end of the 30th capacitor. The first end, the second end of the twentieth capacitor and the twelfth pin of the acceleration detection chip are grounded in common, the 23rd pin and the 24th pin of the acceleration detection chip are connected to the third power supply signal through the thirty-first resistor and the thirty-second resistor respectively, and the 23rd pin and the 24th pin of the acceleration detection chip are connected to the main control unit respectively, the 19th pin of the acceleration detection chip is connected to the first end of the twenty-second capacitor, the 17th pin of the acceleration detection chip and the second end of the twenty-second capacitor are grounded in common, the 13th pin of the acceleration detection chip and the first end of the twenty-first capacitor are connected in common to receive the power supply signal, and the second end of the twenty-first capacitor is grounded.

[0012] In one embodiment, the ranging module includes an infrared transmitting circuit and an infrared receiving circuit; the infrared transmitting circuit includes a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a fourth diode, and a first switch tube, the first end of the twenty-seventh resistor is used for power input, the second end of the twenty-seventh resistor is connected to the drain of the first switch tube through the fourth diode, the source of the first switch tube and the second end of the twenty-sixth resistor are grounded, the first end of the twenty-sixth resistor is connected to the second end of the twenty-fifth resistor, and the first end of the twenty-fifth resistor forms an infrared signal transmitting end connected to the main control unit;

[0013] The infrared receiving circuit includes a twenty-fourth resistor and an infrared receiving chip. The first pin of the infrared receiving chip is connected to the first end of the twenty-fourth resistor to form an infrared signal receiving end connected to the main control unit. The second end of the twenty-fourth resistor is connected to the third pin of the infrared receiving chip for power input. The second pin of the infrared receiving chip is grounded.

[0014] In one embodiment, the temperature detection module includes a twenty-eighth resistor, a twenty-ninth resistor and an eighteenth capacitor, the first end of the twenty-eighth resistor is used for power input, the second end of the twenty-eighth resistor is connected to the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is connected to the first end of the eighteenth capacitor to form a temperature detection signal output end, and is connected to the main control unit, and the second end of the eighteenth capacitor is grounded.

[0015] In one embodiment, the manual control module includes one or more combinations of a wireless communication module, a voice recognition module, an infrared receiving module, and a key input module. The wireless communication module, the voice recognition module, the infrared receiving module, and the key input module are all configured to output a manual control signal to the main control unit according to a user command signal.

[0016] In one embodiment, the heating module includes a heating wire control circuit and a zero-crossing protection circuit, the heating wire control circuit includes a fifteenth resistor, a sixteenth resistor, a first optocoupler chip and a thyristor, the first end of the fifteenth resistor is connected to the main control unit, the second end of the fifteenth resistor is connected to the second pin of the first optocoupler chip, the first pin of the first optocoupler chip is used for power input, the third pin of the first optocoupler chip is connected to the first end of the sixteenth resistor, the second end of the sixteenth resistor is connected to the second pin of the thyristor and the heating wire, the fourth pin of the first optocoupler chip is connected to the third pin of the thyristor, and the first pin of the thyristor is connected to the AC live wire.

[0017] In one embodiment, the infrared receiving module includes a fifth resistor and an infrared receiving chip, the first pin of the infrared receiving chip is connected to the first end of the eighth resistor to form an infrared signal output end and is connected to the main control unit, the second end of the eighth resistor is connected to the third pin of the infrared receiving chip and is connected to the power signal, and the second pin of the infrared receiving chip is grounded.

[0018] In one embodiment, the zero-crossing protection circuit includes a seventeenth resistor, an eighteenth resistor, a nineteenth resistor and a second optocoupler chip, the first end of the seventeenth resistor is connected to the AC live wire, the second end of the seventeenth resistor is connected to the first pin of the second optocoupler chip, the second pin of the second optocoupler chip is connected to the AC neutral wire, the fourth pin of the second optocoupler chip is connected to the second end of the eighteenth resistor and the first end of the nineteenth resistor, the first end of the eighteenth resistor is used for power input, the second end of the nineteenth resistor is used to output a zero-crossing signal and is connected to the main control unit, and the third pin of the second optocoupler chip is grounded.

[0019] In one embodiment, the motor drive circuit includes a drive chip, an eleventh capacitor to a sixteenth capacitor, and a sixth resistor to a fourteenth resistor. The second pin of the drive chip is connected to the eighteenth pin of the drive chip through the eleventh capacitor, the 27th pin of the drive chip is connected to the 21st pin of the drive chip through the twelfth capacitor, the 12th pin of the drive chip is connected to the 23rd pin of the drive chip through the thirteenth capacitor, the 4th pin, the 5th pin, the 9th pin, the 14th pin, and the 15th pin of the drive chip are connected to the main control unit through the sixth resistor to the eleventh resistor, and the 3rd pin of the drive chip is connected to the 16th resistor. The 6th pin, the 13th pin and the first end of the fourteenth capacitor and the first end of the fifteenth capacitor are connected in common to receive the power supply signal input, the second end of the fourteenth capacitor and the second end of the fifteenth capacitor are grounded with the 1st pin of the driving chip, the 19th pin, the 20th pin and the 22nd pin of the driving chip are connected in common and grounded through the fourteenth resistor, the 17th pin of the driving chip is used to receive the power supply signal, the 11th pin of the driving chip is connected in common with the first end of the twelfth resistor and the first end of the thirteenth resistor, the second end of the twelfth resistor is used to receive the power supply signal input, and the second end of the thirteenth resistor is grounded through the sixteenth capacitor.

[0020] In one embodiment, the main control unit includes a microcontroller, and the model of the microcontroller is SWM201G6S7.

[0021] One of the above technical solutions has the following advantages and beneficial effects:

[0022] In each embodiment of the above-mentioned hair dryer adaptive temperature control circuit, a main control unit, a distance measurement module, a temperature detection module, a heating module and a motor drive module are included; wherein the distance measurement module is configured to measure the working distance between the hair dryer outlet and the user's hair; the temperature detection module is configured to monitor the working temperature at the hair dryer outlet; the main control unit is configured to output an adaptive control signal according to the working distance and the working temperature; the heating module is configured to adjust the heating power according to the adaptive control signal; and the motor drive circuit is used to adjust the speed according to the adaptive control signal. The hair dryer adaptive temperature control circuit of the present application adopts a brushless DC motor. Compared with the traditional AC motor, the brushless motor has the advantages of low noise, long life, high energy efficiency, and high energy density. At the same time, the DC brushless motor can better control the speed and run stably within a wide speed range. Therefore, the intelligent high-speed hair dryer using the DC brushless motor has higher energy efficiency, longer service life and better speed regulation performance, which is conducive to improving product quality and user experience; through the cooperation of the ranging module and the temperature detection module, when it is detected that the distance from the air outlet to the human hair is relatively close and the temperature detected at the air outlet is relatively high, the main control unit can actively control the output power of the heating module to reduce, and then actively reduce the air outlet temperature to protect the hair and scalp; when it is detected that the distance is far and the temperature is low, the output power of the heating module can be appropriately increased to make the temperature of the wind blowing to the hair more stable, so as to keep the temperature within a comfortable range; in addition, the present application is also provided with a drop protection circuit to prevent the hair dryer from accidentally falling during operation. When the main control unit detects an abnormal acceleration value, it will trigger the shutdown protection function, and immediately make the motor brake and stop running, so as to avoid damage to the motor due to the collision between the high-speed rotating motor blades and the motor casing caused by the accidental fall of the motor during operation, thereby improving the safety and durability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the framework principle structure of a hair dryer adaptive temperature control circuit in one embodiment;

[0024] Figure 2 Schematic diagram of the circuit structure of the first and second conversion modules in one embodiment;

[0025] Figure 3 is a schematic diagram of the circuit structure of a third conversion module in one embodiment;

[0026] Figure 4 is a schematic diagram of the structure of a drop protection circuit in one embodiment;

[0027] Figure 5 Schematic diagram of the circuit structure of a distance measurement module in one embodiment;

[0028] Figure 6Schematic diagram of the circuit structure of a temperature detection module in one embodiment;

[0029] Figure 7 is a schematic diagram of the circuit structure of a heating module in one embodiment;

[0030] Figure 8 is a schematic structural diagram of a motor drive circuit in one embodiment;

[0031] Fig. 9 FIG. 4 is a schematic diagram of the structure of a main control unit in an embodiment.

[0032] Reference numerals:

[0033] 10 main control unit, 20 distance measurement module, 30 temperature detection module, 40 heating module, 50 motor drive circuit, 60 power conversion module, 70 drop protection circuit;

[0034] R1 is the first resistor, R2 is the second resistor, R3 is the third resistor, R4 is the fourth resistor, R5 is the fifth resistor (R5), R6 is the sixth resistor, R7 is the seventh resistor, R8 is the eighth resistor, R9 is the ninth resistor, R10 is the tenth resistor, R11 is the eleventh resistor, R12 is the twelfth resistor, R13 is the thirteenth resistor, R14 is the fourteenth resistor, R15 is the fifteenth resistor, R16 is the sixteenth resistor, R17 is the seventeenth resistor, R18 is the eighteenth resistor, R19 is the nineteenth resistor, R20 is the twentieth resistor, R21 is the twenty-first resistor, R22 is the twenty-second resistor, R23 is the twenty-third resistor, R24 is the twenty-fourth resistor, R25 is the twenty-fifth resistor, R26 is the twenty-sixth resistor, R27 is the twenty-seventh resistor, R28 is the twenty-eighth resistor, R29 is the twenty-ninth resistor, R30 is the thirtieth resistor, R31 is the thirty-first resistor, R32 is the thirty-second resistor, R33 is the thirty-third resistor, R34 is the thirty-fourth resistor, R35 is the thirty-fifth resistor, R36 is the thirty-sixth resistor, R37 is the thirty-seventh resistor;

[0035] C1 is the first capacitor, C2 is the second capacitor, C3 is the third capacitor, C4 is the fourth capacitor, C5 is the fifth capacitor, C6 is the sixth capacitor, C7 is the seventh capacitor, C8 is the eighth capacitor, C9 is the ninth capacitor, C10 is the tenth capacitor, C11 is the eleventh capacitor, C12 is the twelfth capacitor, C13 is the thirteenth capacitor, C14 is the fourteenth capacitor, C15 is the fifteenth capacitor, C16 is the sixteenth capacitor, C17 is the seventeenth capacitor, C18 is the eighteenth capacitor, C19 is the nineteenth capacitor, C20 is the twentieth capacitor, C21 is the twenty-first capacitor, C22 is the twenty-second capacitor, C23 is the twenty-third capacitor, C24 is the twenty-fourth capacitor, C25 is the twenty-fifth capacitor, C26 is the twenty-sixth capacitor;

[0036] U1 rectifier bridge stack, U2 first power supply chip, U3 second power supply chip, U4 driver chip, U5 first optocoupler chip, U6 second optocoupler chip, U7 infrared receiving chip, U8 acceleration detection chip, U9 microcontroller, L1 first inductor, D1 first diode, D2 second diode, D3 third diode, D4 ​​fourth diode, FS1 fuse, VDR1 varistor, Q1 first switch tube, Q2 controllable tube. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Example

[0040] like Figure 1 As shown: This embodiment provides a hair dryer adaptive temperature control circuit, including:

[0041] A main control unit 10, a distance measuring module 20, a temperature detection module 30, a heating module 40 and a motor drive circuit 50, wherein the main control unit 10 is electrically connected to the distance measuring module 20, the temperature detection module 30, the heating module 40 and the motor drive circuit 50 respectively; wherein the distance measuring module 20 is used to measure the working distance between the air outlet of the hair dryer and the user's hair; the temperature detection module 30 is used to measure the working temperature at the air outlet of the hair dryer; the main control unit 10 is used to output an adaptive control signal according to the working distance and the working temperature; the heating module 40 is used to adjust the heating power according to the adaptive control signal; and the motor drive circuit 50 is used to adjust the rotation speed according to the adaptive control signal.

[0042] The motor driving circuit 50 is configured to drive a brushless DC motor.

[0043] The adaptive temperature control circuit of the hair dryer disclosed in the present application, through the cooperation of the distance measuring module 20 and the temperature detection module 30, when it is detected that the distance from the air outlet to the human hair is relatively close and the temperature detected at the air outlet is relatively high, the main control unit 10 can actively control the output power of the heating module 40 to reduce, thereby actively reducing the air outlet temperature to protect the hair and scalp; when it is detected that the distance is far and the temperature is low, the output power of the heating module 40 can be appropriately increased to make the temperature of the wind blowing to the hair more stable, thereby keeping the temperature within a comfortable range, optimizing the user's hair-drying experience and enhancing the product's competitiveness and market appeal.

[0044] like Figure 1 As shown, in addition to the features of the above embodiments, this embodiment is further defined as follows: it also includes a power conversion module 60, the power conversion module 60 includes a first conversion module, a second conversion module and a third conversion module, the first conversion module is configured to convert and process the received external power signal to obtain a first power supply signal; the second conversion module is configured to convert and process the received first power supply signal to obtain a second power supply signal; the third conversion module is configured to convert and process the received second power supply signal to obtain a third power supply signal;

[0045] Among them, the first power supply signal is also used to power the motor drive circuit 50 and the main control unit 10, the second power supply signal is also used to power the motor drive circuit 50, and the third power supply signal is also used to power the ranging module 20, the temperature detection module 30, the heating module 40 and the motor drive circuit 50.

[0046] Among them, the first power supply signal is a DC voltage of 310V, the second power supply signal is a DC voltage of 15V, and the third power supply signal is a DC voltage of 5V.

[0047] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the first conversion module includes a fuse FS1, a first resistor R1, a second resistor R2, a varistor VDR1, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a rectifier bridge stack U1, the first end of the first resistor R1 and the first end of the varistor VDR1 are connected to the first input end of the rectifier bridge stack U1 and are connected to the AC live wire, the second end of the fuse FS1, the second end of the second resistor R2, the second end of the varistor VDR1 and the second input end of the rectifier bridge stack U1 are connected to each other, the first end of the fuse FS1 is connected to the AC neutral line, the first output end of the rectifier bridge stack U1 is connected to the first end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the third capacitor C3 to form a first power supply signal output end, and the second output end of the rectifier bridge stack U1 is grounded to the second end of the first capacitor C1, the second end of the second capacitor C2, and the second end of the third capacitor C3.

[0048] Among them, the AC live wire and the AC neutral wire can cooperate to input AC 220V for the first conversion module; the rectifier bridge stack U1 can rectify the input AC signal and output a DC signal; the model of the rectifier bridge stack U1 can be KBP310; the first capacitor C1 and the second capacitor C2 can be polarized electrolytic capacitors.

[0049] like Figure 2 As shown, in addition to the features of the above embodiments, the present embodiment further defines that: the second conversion module includes a first power chip U2, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a fourth resistor R4, a fifth resistor R5, a first inductor L1, a first diode D1, a second diode D2, and a third diode D3, the 5th to 8th pins of the first power chip U2 are connected in common with the first end of the fourth capacitor C4 to receive the first power supply signal, the second end of the fourth capacitor C4, the anode of the first diode D1, the second end of the sixth capacitor C6, the anode of the third diode D3 and the second end of the seventh capacitor C7 are connected in common, the 1st pin of the first power chip U2 is connected in common with the 2nd pin of the fourth resistor R4 One end, the first end of the fifth capacitor C5 and the cathode of the second diode D2 are connected together, the anode of the second diode D2 and the second end of the first inductor L1, the first end of the sixth capacitor C6, the cathode of the third diode D3, and the first end of the seventh capacitor C7 are connected together to form a second power supply signal output end, the first end of the first inductor L1 and the second end of the fifth capacitor C5, the cathode of the first diode D1, the second pin of the first power chip U2, the second end of the third resistor R3 and the second end of the fifth resistor R5 are connected together, the first end of the third resistor R3 is connected to the fourth pin of the first power chip U2, and the first end of the fifth resistor R5 and the second end of the fourth resistor R4 and the third pin of the first power chip U2 are connected together.

[0050] Among them, the model of the first power chip U2 can be U3210A, the 1st pin to the 4th pin of the first power chip U2 are respectively the power supply voltage input terminal VDD, the voltage feedback terminal FB, the current feedback terminal CS and the ground terminal GND, the 5th pin to the 8th pin of the first power chip U2 are respectively the first input terminal to the fourth input terminal of the AC voltage; the sixth capacitor C6 is a polar electrolytic capacitor.

[0051] like Figure 3As shown, in addition to the features of the above embodiments, this embodiment further defines: the third conversion module includes a second power supply chip U3, an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10, the first pin of the second power supply chip U3 is connected in common with the first end of the ninth capacitor C9 and the first end of the tenth capacitor C10 to form a third power supply signal output end, the second pin of the second power supply chip is connected in common with the second end of the eighth capacitor C8, the second end of the ninth capacitor C9 and the second end of the tenth capacitor C10 to ground, and the third pin of the second power supply chip is connected in common with the third pin of the eighth capacitor C8 to receive the second power supply signal.

[0052] The model of the second power chip U3 is 78L05, the first pin to the third pin of the second power chip U3 are the ground terminal, the output terminal and the input terminal respectively; the thirteenth capacitor C13 is a non-polar electrolytic capacitor.

[0053] like Figure 4 As shown, in addition to the features of the above embodiments, the present embodiment further defines: the hair dryer adaptive temperature control circuit also includes a drop protection circuit 70, the drop protection circuit 70 includes an acceleration detection chip U8, a 30th resistor R30, a 31st resistor R31, a 32nd resistor R32, a 19th capacitor C19, a 20th capacitor C20, a 21st capacitor C21 and a 22nd capacitor C22, the 1st pin of the acceleration detection chip U8 is connected to the first end of the 19th capacitor C19, the 8th pin of the acceleration detection chip U8 is connected to the second end of the 19th capacitor C19 to receive a third power supply signal, the 10th pin of the acceleration detection chip U8 is connected to the first end of the 30th resistor R30, the 11th pin of the acceleration detection chip U8 is connected to the 21st pin of the 20th capacitor C20 One end is connected, the second end of the 30th resistor R30, the second end of the 20th capacitor C20 and the 12th pin of the acceleration detection chip U8 are grounded, the 23rd pin and the 24th pin of the acceleration detection chip U8 are connected to the third power supply signal through the 31st resistor R31 and the 32nd resistor R32 respectively, and the 23rd pin and the 24th pin of the acceleration detection chip U8 are connected to the main control unit 10 respectively, the 19th pin of the acceleration detection chip U8 is connected to the first end of the 22nd capacitor C22, the 17th pin of the acceleration detection chip U8 and the second end of the 22nd capacitor C22 are grounded, the 13th pin of the acceleration detection chip U8 and the first end of the 21st capacitor C21 are connected to receive the third power supply signal, and the second end of the 21st capacitor C21 is grounded.

[0054] Among them, the model of the acceleration detection chip U8 is MPU6050, the 1st pin of the acceleration detection chip U8 is the external clock input terminal, the 8th pin to the 11th pin are the logic voltage supply terminal, the power supply terminal, the Slave terminal, the calibration filter capacitor terminal and the frame synchronization digital input terminal, the 23rd pin and the 24th pin are the IIC communication SCL terminal and the IIC communication SDA terminal, and the 20th pin is the charge pump capacitor connection terminal.

[0055] like Figure 5 As shown, in addition to the features of the above embodiments, this embodiment further defines: the distance measurement module 20 includes an infrared transmitting circuit and an infrared receiving circuit;

[0056] The infrared transmitting circuit includes a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a fourth diode D4, and a first switch tube Q1. The first end of the twenty-seventh resistor R27 is used for power input, the second end of the twenty-seventh resistor R27 is connected to the drain of the first switch tube Q1 through the fourth diode D4, the source of the first switch tube Q1 and the second end of the twenty-sixth resistor are grounded, the first end of the twenty-sixth resistor R26 is connected to the second end of the twenty-fifth resistor R25, and the first end of the twenty-fifth resistor R25 forms an infrared signal transmitting end connected to the main control unit 10;

[0057] The infrared receiving circuit includes a twenty-fourth resistor R24 ​​and an infrared receiving chip U7. The first pin of the infrared receiving chip U7 is connected to the first end of the twenty-fourth resistor R24 ​​to form an infrared signal receiving end connected to the main control unit 10. The second end of the twenty-fourth resistor R24 ​​is connected to the third pin of the infrared receiving chip U7 for power input. The second pin of the infrared receiving chip U7 is grounded.

[0058] Among them, the fourth diode D4 is a light emitting diode for providing infrared rays; the first switch tube Q1 is an NMOS tube; the model of the infrared receiving chip U7 is VS1838B, and its first pin is an output pin for providing an infrared sequence and depends on the detected infrared signal, the second pin is a ground pin, and the third pin is a power access pin.

[0059] like Figure 6 As shown, in addition to the features of the above embodiments, this embodiment further defines: the temperature detection module 30 includes a twenty-eighth resistor R28, a twenty-ninth resistor R29 and an eighteenth capacitor C18, the first end of the twenty-eighth resistor R28 is used for power input, the second end of the twenty-eighth resistor R28 is connected to the first end of the twenty-ninth resistor R29, the second end of the twenty-ninth resistor R29 is connected to the first end of the eighteenth capacitor C18 to form a temperature detection signal output end, and is connected to the main control unit 10, and the second end of the eighteenth capacitor C18 is grounded.

[0060] like Figure 7 As shown, in addition to the features of the above embodiments, the present embodiment further defines that: the heating module 40 includes a heating wire control circuit and a zero-crossing protection circuit, the heating wire control circuit includes a fifteenth resistor R15, a sixteenth resistor R16, a first optocoupler chip U5 and a thyristor Q2, the first end of the fifteenth resistor R15 is connected to the main control unit 10, the second end of the fifteenth resistor R15 is connected to the second pin of the first optocoupler chip U5, the first pin of the first optocoupler chip U5 is used for power input, the third pin of the first optocoupler chip U5 is connected to the first end of the sixteenth resistor R16, the second end of the sixteenth resistor R16 is connected to the second pin of the thyristor Q2 and the heating wire, the fourth pin of the first optocoupler chip U5 is connected to the third pin of the thyristor Q2, and the first pin of the thyristor Q2 is connected to the AC live wire.

[0061] Among them, the model of the first optocoupler chip U5 is M3052, and the 1st to 4th pins of the first optocoupler chip U5 are the anode, cathode, first output end and second output end respectively; the model of the thyristor Q2 is BTA206, and the 1st to 3rd pins of the thyristor Q2 are the first main terminal, the second main terminal and the trigger electrode respectively.

[0062] like Figure 7 As shown, in addition to the features of the above embodiments, the present embodiment further defines that: the zero-crossing protection circuit includes a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19 and a second optocoupler chip U6, the first end of the seventeenth resistor R17 is connected to the AC live wire, the second end of the seventeenth resistor R17 is connected to the first pin of the second optocoupler chip U6, the second pin of the second optocoupler chip U6 is connected to the AC neutral line, the fourth pin of the second optocoupler chip U6 is connected to the second end of the eighteenth resistor R18 and the first end of the nineteenth resistor R19, the first end of the eighteenth resistor R18 is used for power input, the second end of the nineteenth resistor R19 is used to output a zero-crossing signal and is connected to the main control unit 10, and the third pin of the second optocoupler chip U6 is grounded.

[0063] The model of the second optocoupler chip U6 is EL3H4, and the first pin to the third pin of the second optocoupler chip U6 are respectively a first input terminal, a second input terminal, an emitter, and a collector.

[0064] like Figure 8As shown, in addition to the features of the above embodiments, the present embodiment further defines that: the motor driving circuit 50 includes a driving chip U4, an eleventh capacitor C11 to a sixteenth capacitor C16, a sixth resistor R6 to a fourteenth resistor R14, the second pin of the driving chip U4 is connected to the 18th pin of the driving chip U4 through the eleventh capacitor C11, the 27th pin of the driving chip U4 is connected to the 21st pin of the driving chip U4 through the twelfth capacitor C12, the 12th pin of the driving chip U4 is connected to the 23rd pin of the driving chip U4 through the thirteenth capacitor C13, and the 4th pin, the 5th pin, the 9th pin, the 10th pin, the 14th pin, and the 15th pin of the driving chip U4 are connected to the main control unit 10 through the sixth resistor R6 to the eleventh resistor R11 respectively. The 3rd, 6th and 13th pins of the driving chip U4 and the first end of the fourteenth capacitor C14 and the first end of the fifteenth capacitor C15 are connected in common to receive the power supply signal input, the second end of the fourteenth capacitor C14 and the second end of the fifteenth capacitor C15 are grounded in common with the 1st pin of the driving chip U4, the 19th, 20th and 22nd pins of the driving chip U4 are connected in common and grounded through the fourteenth resistor R14, the 17th pin of the driving chip U4 is used to receive the power supply signal, the 11th pin of the driving chip U4 is connected in common with the first end of the twelfth resistor R12 and the first end of the thirteenth resistor R13, the second end of the twelfth resistor R12 is used to receive the power supply signal input, and the second end of the thirteenth resistor R13 is grounded through the sixteenth capacitor C16.

[0065] Among them, the model of the driver chip U4 is SD05M50D / DLS, and the 1st to 23rd pins of the driver chip U4 are respectively a common ground, a U-phase high-side drive floating power supply voltage terminal, a U-phase ground measurement drive power supply voltage, a U-phase high-side signal input terminal, a U-phase low-side signal input terminal, a U-phase high-side drive floating power supply ground terminal, a V-phase high-side drive floating power supply voltage terminal, a V-phase ground measurement drive power supply voltage, a V-phase high-side signal input terminal, a V-phase low-side signal input terminal, a V-phase high-side drive floating power supply ground terminal, a W-phase high-side drive floating power supply voltage terminal, a W-phase ground measurement drive power supply voltage, a W-phase high-side signal input terminal, a W-phase low-side signal input terminal, a W-phase high-side drive floating power supply ground terminal, a DC positive terminal, a U-phase output terminal, a U-phase DC negative terminal, a V-phase DC negative terminal, a V-phase output, a W-phase DC negative terminal and a W-phase output terminal.

[0066] like Fig. 9 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the main control unit 1030 includes a microcontroller U9, and the model of the microcontroller U9 is SWM201G6S7.

[0067] Among them, the 12th pin of the microcontroller U9 is connected to the first end of the 26th capacitor C26 and the second end of the 38th resistor R38, the second end of the 26th resistor R26 is connected to the second end of the 36th resistor R36 and the first end of the 37th resistor R37, the first end of the 36th resistor R36 is connected to the first end of the 38th resistor R38 and the second end of the 35th resistor R35, and the first end of the 35th resistor R35 is used to receive the power supply signal; the 1st pin of the microcontroller U9 is connected to the first end of the 23rd capacitor C23 and the second end of the 33rd resistor R33, the second end of the 23rd capacitor C23 is grounded, the first end of the 33rd resistor R33 is used to receive the power supply signal, the 26th pin of the microcontroller U9 is connected to the second end of the 25th capacitor C25 and the second end of the 24th capacitor C24 is grounded, the 27th pin of the microcontroller U9 is connected to the second end of the 34th resistor R34 and the first end of the 25th capacitor C25, and the 28th pin of the microcontroller U9 is connected to the first end of the 24th capacitor C24 and the first end of the 34th resistor R34 to receive the power supply signal;

[0068] Pin 2 of the microcontroller U9 is connected to pin 24 of the acceleration detection chip U8, pin 3 of the microcontroller U9 is connected to pin 23 of the acceleration detection chip U8, pin 7 of the microcontroller U9 is connected to the temperature detection signal output end of the temperature detection module 30, pin 9 of the microcontroller U9 is connected to the infrared signal transmitting end of the infrared transmitting circuit, pin 10 of the microcontroller U9 is connected to the infrared signal receiving end of the infrared transmitting circuit, and pins 20 to 25 of the microcontroller U9 are respectively connected to pins 4, 5, 9, 10, 14, and 15 of the motor drive circuit 50.

[0069] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A hair dryer adaptive temperature control circuit, characterized in that: include: A main control unit, a distance measuring module, a temperature detection module, a heating module and a motor driving circuit, wherein the main control unit is electrically connected to the distance measuring module, the temperature detection module, the heating module and the motor driving circuit respectively; Wherein, the distance measuring module is used to measure the working distance between the air outlet of the hair dryer and the user's hair; the temperature detection module is used to monitor the working temperature at the air outlet of the hair dryer; The main control unit is used to output an adaptive control signal according to the working distance and the working temperature; The heating module is used to adjust the heating power according to the adaptive control signal; the motor drive circuit is used to adjust the rotation speed according to the adaptive control signal.

2. The hair dryer adaptive temperature control circuit according to claim 1, characterized in that: It also includes a power conversion module, the power conversion module includes a first conversion module, a second conversion module and a third conversion module, the first conversion module is configured to convert the received external power signal to obtain a first power supply signal; The second conversion module is configured to convert the received first power supply signal to obtain a second power supply signal; the third conversion module is configured to convert the received second power supply signal to obtain a third power supply signal; Among them, the first power supply signal is also used to power the motor drive circuit and the main control unit, the second power supply signal is also used to power the motor drive circuit, and the third power supply signal is also used to power the ranging module, the temperature detection module, the heating module and the motor drive circuit.

3. The hair dryer adaptive temperature control circuit according to claim 2, characterized in that: The first conversion module includes a fuse, a first resistor, a second resistor, a varistor, a first capacitor, a second capacitor, a third capacitor and a rectifier bridge stack, wherein the first end of the first resistor and the first end of the varistor are connected in common with the first input end of the rectifier bridge stack and are connected to the AC live wire, the second end of the fuse, the second end of the second resistor, the second end of the varistor and the second input end of the rectifier bridge stack are connected in common, the first end of the fuse is connected to the AC neutral wire, the first output end of the rectifier bridge stack is connected in common with the first end of the first capacitor, the first end of the second capacitor and the first end of the third capacitor to form the first power supply signal output end, and the second output end of the rectifier bridge stack is grounded in common with the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor; and / or The second conversion module includes a first power chip, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third resistor, a fourth resistor, a fifth resistor, a first inductor, a first diode, a second diode, and a third diode. Pins 5-8 of the first power chip are connected to the first end of the fourth capacitor to receive the first power supply signal. The second end of the fourth capacitor, the positive electrode of the first diode, the second end of the sixth capacitor, the positive electrode of the third diode, and the second end of the seventh capacitor are connected. Pin 1 of the first power chip is connected to the first end of the fourth resistor, the first end of the fifth capacitor, and the negative electrode of the second diode. The positive electrode of the second diode is connected to the second end of the first inductor, the first end of the sixth capacitor, the negative electrode of the third diode, and the first end of the seventh capacitor to form the second power supply signal output end. The first end of the first inductor is connected to the second end of the fifth capacitor, the negative electrode of the first diode, the second pin of the first power chip, the second end of the third resistor, and the second end of the fifth resistor. The first end of the third resistor is connected to pin 4 of the first power chip, and the first end of the fifth resistor is connected to pin 3 of the first power chip. and / or The third conversion module includes a second power supply chip, an eighth capacitor, a ninth capacitor and a tenth capacitor. The first pin of the second power supply chip is connected to the first end of the ninth capacitor and the first end of the tenth capacitor to form the third power supply signal output end. The second pin of the second power supply chip is connected to the second end of the eighth capacitor, the second end of the ninth capacitor and the second end of the tenth capacitor to a common ground. The third pin of the second power supply chip is connected to the third pin of the eighth capacitor to receive the second power supply signal.

4. The hair dryer adaptive temperature control circuit according to claim 2, characterized in that: The device also includes a drop protection circuit, which includes an acceleration detection chip, a 30th resistor, a 31st resistor, a 32nd resistor, a 19th capacitor, a 20th capacitor, a 21st capacitor, and a 22nd capacitor. The first pin of the acceleration detection chip is connected to the first end of the 19th capacitor, the 8th pin of the acceleration detection chip is connected to the second end of the 19th capacitor to receive a power supply signal, the 10th pin of the acceleration detection chip is connected to the first end of the 30th resistor, the 11th pin of the acceleration detection chip is connected to the first end of the 20th capacitor, the second end of the 30th resistor and the second end of the 20th capacitor are connected to receive a power supply signal. and pin 12 of the acceleration detection chip are grounded, pin 23 and pin 24 of the acceleration detection chip are connected to the third power supply signal through the thirty-first resistor and the thirty-second resistor respectively, and pin 23 and pin 24 of the acceleration detection chip are connected to the main control unit respectively, pin 19 of the acceleration detection chip is connected to the first end of the twenty-second capacitor, pin 17 of the acceleration detection chip and the second end of the twenty-second capacitor are grounded, pin 13 of the acceleration detection chip is connected to the first end of the twenty-first capacitor to receive the power supply signal, and the second end of the twenty-first capacitor is grounded.

5. The hair dryer adaptive temperature control circuit according to claim 1, characterized in that: The distance measurement module includes an infrared transmitting circuit and an infrared receiving circuit; The infrared transmitting circuit includes a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a fourth diode, and a first switch tube, the first end of the twenty-seventh resistor is used for power input, the second end of the twenty-seventh resistor is connected to the drain of the first switch tube through the fourth diode, the source of the first switch tube and the second end of the twenty-sixth resistor are grounded, the first end of the twenty-sixth resistor is connected to the second end of the twenty-fifth resistor, and the first end of the twenty-fifth resistor forms an infrared signal transmitting end connected to the main control unit; The infrared receiving circuit includes a twenty-fourth resistor and an infrared receiving chip. The first pin of the infrared receiving chip is connected to the first end of the twenty-fourth resistor to form an infrared signal receiving end connected to the main control unit. The second end of the twenty-fourth resistor is connected to the third pin of the infrared receiving chip for power input. The second pin of the infrared receiving chip is grounded.

6. The hair dryer adaptive temperature control circuit according to claim 1, characterized in that: The temperature detection module includes a twenty-eighth resistor, a twenty-ninth resistor and an eighteenth capacitor, the first end of the twenty-eighth resistor is used for power input, the second end of the twenty-eighth resistor is connected to the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is connected to the first end of the eighteenth capacitor to form a temperature detection signal output end, and is connected to the main control unit, and the second end of the eighteenth capacitor is grounded.

7. The hair dryer adaptive temperature control circuit according to claim 1, characterized in that: The heating module includes a heating wire control circuit and a zero-crossing protection circuit. The heating wire control circuit includes a fifteenth resistor, a sixteenth resistor, a first optocoupler chip and a thyristor. The first end of the fifteenth resistor is connected to the main control unit, the second end of the fifteenth resistor is connected to the second pin of the first optocoupler chip, the first pin of the first optocoupler chip is used for power input, the third pin of the first optocoupler chip is connected to the first end of the sixteenth resistor, the second end of the sixteenth resistor is connected to the second pin of the thyristor and the heating wire, the fourth pin of the first optocoupler chip is connected to the third pin of the thyristor, and the first pin of the thyristor is connected to the AC live wire.

8. The hair dryer adaptive temperature control circuit according to claim 7, characterized in that: The zero-crossing protection circuit includes a seventeenth resistor, an eighteenth resistor, a nineteenth resistor and a second optocoupler chip, the first end of the seventeenth resistor is connected to the AC live wire, the second end of the seventeenth resistor is connected to the first pin of the second optocoupler chip, the second pin of the second optocoupler chip is connected to the AC neutral line, the fourth pin of the second optocoupler chip is connected to the second end of the eighteenth resistor and the first end of the nineteenth resistor, the first end of the eighteenth resistor is used for power input, the second end of the nineteenth resistor is used to output a zero-crossing signal and is connected to the main control unit, and the third pin of the second optocoupler chip is grounded.

9. The hair dryer adaptive temperature control circuit according to claim 1, characterized in that: The motor drive circuit includes a drive chip, an eleventh capacitor to a sixteenth capacitor, and a sixth resistor to a fourteenth resistor. The second pin of the drive chip is connected to the eighteenth pin of the drive chip through the eleventh capacitor, the 27th pin of the drive chip is connected to the 21st pin of the drive chip through the twelfth capacitor, the 12th pin of the drive chip is connected to the 23rd pin of the drive chip through the thirteenth capacitor, the 4th pin, the 5th pin, the 9th pin, the 10th pin, the 14th pin, and the 15th pin of the drive chip are connected to the main control unit through the sixth resistor to the eleventh resistor, and the 3rd pin, the 6th pin, the 7th pin, the 8th pin, the 9th pin, the 10th pin, the 14th pin, and the 15th pin of the drive chip are connected to the main control unit through the sixth resistor to the eleventh resistor, respectively. The first pin, the 13th pin and the first end of the fourteenth capacitor and the first end of the fifteenth capacitor are connected in common to receive the power supply signal input, the second end of the fourteenth capacitor and the second end of the fifteenth capacitor are grounded with the first pin of the driving chip, the 19th pin, the 20th pin and the 22nd pin of the driving chip are connected in common and grounded through the fourteenth resistor, the 17th pin of the driving chip is used to receive the power supply signal, the 11th pin of the driving chip is connected in common with the first end of the twelfth resistor and the first end of the thirteenth resistor, the second end of the twelfth resistor is used to receive the power supply signal input, and the second end of the thirteenth resistor is grounded through the sixteenth capacitor.

10. The hair dryer adaptive temperature control circuit according to any one of claims 1 to 9, characterized in that: The main control unit includes a microcontroller, and the model of the microcontroller is SWM201G6S7.

Images