Air duct child lock circuit and air duct

Abstract

The utility model discloses an air duct child lock circuit and an air duct. The air duct child lock circuit comprises a timer; the wind speed control circuit is used for outputting a wind speed trigger signal when being triggered; the air temperature control circuit is used for outputting an air temperature trigger signal when being triggered; the main control circuit is electrically connected with the timer, the wind speed input end of the main control circuit is connected with the output end of the wind speed control circuit, the wind temperature input end of the main control circuit is connected with the output end of the wind temperature control circuit, and the main control circuit is used for triggering the timer to work when receiving a wind speed trigger signal or a wind temperature trigger signal. And the controller is used for outputting a locking control signal before receiving the timing trigger signal output by the timer and when receiving at least one wind speed trigger signal or wind temperature trigger signal. The utility model aims to enable the air duct to have a locking function.

Description

Technical Field

[0001] The utility model relates to the field of hair dryers, in particular to a child lock circuit for a hair dryer and a hair dryer. Background Art

[0002] Traditional hair dryers are turned on by flipping a switch or pressing a button. These hair dryers typically use a heating wire to heat the air and blow out the hot air. Improper control of the heating wire can not only cause burns, but can also cause fires. For example, children playing with the hair dryer or pets could accidentally trigger the dryer, resulting in burns, damage to furniture, or even a fire. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a child lock circuit for a hair dryer and a hair dryer, so that the hair dryer has a locking function.

[0004] The technical solution of the utility model is as follows:

[0005] A child lock circuit for a hair dryer, comprising:

[0006] Timer;

[0007] The wind speed control circuit is used to output a wind speed trigger signal when triggered;

[0008] The wind temperature control circuit is used to output a wind temperature trigger signal when triggered;

[0009] A main control circuit is electrically connected to the timer, the wind speed input end of the main control circuit is connected to the output end of the wind speed control circuit, and the wind temperature input end of the main control circuit is connected to the output end of the wind temperature control circuit. The main control circuit is used to trigger the timer to work when it receives the wind speed trigger signal or the wind temperature trigger signal, and is used to output a locking control signal when it receives at least one of the wind speed trigger signal or the wind temperature trigger signal before receiving the timing trigger signal output by the timer.

[0010] Optionally, the main control circuit is also used to trigger the timer to work when it receives the wind speed trigger signal or the wind temperature trigger signal, and output an unlocking control signal when it receives at least one of the wind speed trigger signal or the wind temperature trigger signal before receiving the timing trigger signal output by the timer.

[0011] Optionally, the wind speed control circuit includes at least one wind speed button, which is connected to the wind speed input end of the main control circuit, and the wind speed button is used to output a wind speed trigger signal to the main control circuit when triggered.

[0012] Optionally, the wind temperature control circuit includes at least one wind temperature button, which is connected to the wind temperature input end of the main control circuit, and the wind temperature button is used to output a wind temperature trigger signal to the main control circuit when triggered.

[0013] Optionally, the hair dryer child lock circuit further includes:

[0014] The motor drive circuit is connected to the wind speed output end of the main control circuit. The motor drive circuit is used to connect to the motor. The motor drive circuit is used to drive the motor to stop working when receiving the locking control signal.

[0015] Optionally, the hair dryer child lock circuit further includes:

[0016] The heating wire control circuit is connected to the wind temperature output end of the main control circuit. The heating wire control circuit is used to connect the heating wire. The heating wire control circuit is used to control the heating wire to stop working when receiving the locking control signal.

[0017] Optionally, the hair dryer child lock circuit further includes:

[0018] A wireless communication circuit is connected to the main control circuit, and the wireless communication circuit is used to communicate with an external terminal. The wireless communication circuit is used to receive a locking trigger signal output by the external terminal and output it to the main control circuit. The main control circuit is also used to output a locking control signal when receiving the locking trigger signal.

[0019] Optionally, the hair dryer child lock circuit further includes:

[0020] A power supply circuit, wherein the output end of the power supply circuit is connected to the power input end of the main control circuit, and the power supply circuit is used to provide an operating voltage to the main control circuit.

[0021] The present invention also provides a hair dryer, comprising a motor, a heating wire and the hair dryer child lock circuit as described above, wherein the output end of the hair dryer child lock circuit is respectively connected to the input end of the motor and the input end of the heating wire.

[0022] Optionally, the air duct further comprises:

[0023] A housing is formed with a housing cavity, and the motor and the heating wire are accommodated in the housing;

[0024] A printed circuit board is housed in the housing, and the hair dryer child lock circuit is arranged on the printed circuit board.

[0025] The technical solution of the present utility model comprises a child lock circuit for a hair dryer, comprising a timer, a wind speed control circuit, a wind temperature control circuit, and a main control circuit. The wind speed control circuit is configured to output a wind speed trigger signal when triggered; the wind temperature control circuit is configured to output a wind temperature trigger signal when triggered; the main control circuit is electrically connected to the timer, the wind speed input of the main control circuit is connected to the output of the wind speed control circuit, and the wind temperature input of the main control circuit is connected to the output of the wind temperature control circuit. The main control circuit is configured to trigger the timer upon receiving a wind speed trigger signal or a wind temperature trigger signal, and to output a locking control signal upon receiving at least one of the wind speed trigger signal or the wind temperature trigger signal before receiving a timing trigger signal output by the timer. The child lock circuit for a hair dryer of this solution is applied to the hair dryer to provide the hair dryer with a child lock function. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a functional module diagram of an embodiment of a child lock circuit for a hair dryer of the present invention.

[0028] Figure 2 This is a circuit structure diagram of an embodiment of the main control circuit in the child lock circuit of the hair dryer of the present invention.

[0029] Figure 3 This is a circuit structure diagram of an embodiment of a motor drive circuit in a child lock circuit of a hair dryer of the present invention.

[0030] Figure 4 This is a circuit structure diagram of an embodiment of a child lock circuit for a hair dryer of the present invention.

[0031] Explanation of reference numerals: 10, timer; 20, main control circuit; 30, wind speed control circuit; 40, wind temperature control circuit. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and effect of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the embodiments and patent claims, unless otherwise specified herein, the words "a," "an," "the," and "the" may include plural forms. If the embodiments of the present invention include descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0034] It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element is said to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements. In addition, "connected" or "coupled" as used herein can include wireless connections or wireless couplings. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0035] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0036] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0037] Traditional hair dryers are turned on by flipping a switch or pressing a button. These hair dryers typically use a heating wire to heat the air and blow out the hot air. Improper control of the heating wire can not only cause burns, but can also cause fires. For example, children playing with the hair dryer or pets could accidentally trigger the dryer, resulting in burns, damage to furniture, or even a fire.

[0038] In order to solve the above problems, the utility model provides a child lock circuit for a hair dryer.

[0039] Reference Figure 1 In one embodiment, the hair dryer child lock circuit includes:

[0040] Timer 10;

[0041] The wind speed control circuit 30 is configured to output a wind speed trigger signal when triggered;

[0042] The wind temperature control circuit 40 is used to output a wind temperature trigger signal when triggered;

[0043] The main control circuit 20 is electrically connected to the timer 10. The wind speed input end of the main control circuit 20 is connected to the output end of the wind speed control circuit 30, and the wind temperature input end of the main control circuit 20 is connected to the output end of the wind temperature control circuit 40. The main control circuit 20 is used to trigger the timer 10 to work when it receives the wind speed trigger signal or the wind temperature trigger signal, and is used to output a locking control signal when it receives at least one of the wind speed trigger signal or the wind temperature trigger signal before receiving the timing trigger signal output by the timer 10.

[0044] In this embodiment, the wind speed control circuit 30 can be composed of buttons, which are used to adjust the wind speed of the hair dryer. Specifically, by pressing the button, the corresponding wind speed trigger signal can be output to the main control circuit 20. The number of buttons can be set to one or more. The wind speed control circuit 30 can also be composed of a touch screen, which outputs the wind speed trigger signal to the main control circuit 20 by triggering the touch screen. The wind temperature control circuit 40 can also be composed of buttons or a touch screen, which is used to adjust the wind temperature of the hair dryer. The timer 10 can be used for timing or timing. The timer 10 can preset the timing time. After the timing reaches the preset time, the timer 10 outputs the timing trigger signal to the main control circuit 20. The preset time of the timer 10 can be set according to actual conditions and user needs. The main control circuit 20 can be composed of circuit devices such as a controller or a control chip. The controller can be a digital signal processor (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a microprocessor, an MCU or other electronic components. In this embodiment, the model of the controller can be CMS32M5710L048. The specific circuit of the main control circuit 20 can be referred to Figure 2The settings are performed, and the parameters and labels therein are for reference only, and this solution is not limited here; the main control circuit 20 controls the timer 10 to start timing when receiving a wind speed trigger signal or a wind temperature trigger signal. Before the timer 10 reaches the preset time to output the timing trigger signal, the main control circuit 20 receives at least one of the wind speed trigger signal or the wind temperature trigger signal, and then outputs a locking control signal; it can be understood that when the main control circuit 20 receives at least one wind speed trigger signal or wind temperature trigger signal in a preset order within the preset time, it will output a locking control signal to put the hair dryer into a locked state, so that the motor and heating wire in the hair dryer stop working, thereby avoiding the occurrence of safety accidents; the preset time and preset order can be set according to actual conditions and user needs. For example, the preset time can be 3 seconds, and the preset order can be to receive three wind speed trigger signals and then three wind temperature trigger signals. By setting the preset time and preset order, children or pets can also be prevented from accidentally triggering the lock of the hair dryer. The hair dryer can be locked in either sleep or active mode. Locking the hair dryer in sleep mode prevents it from operating; locking it in active mode stops it from operating. Furthermore, the hair dryer can have a power-off hold function, maintaining the locked state even after power is disconnected. Thus, the combination of the timer 10, the wind speed control circuit 30, and the wind temperature control circuit 40 provides a child lock function for the hair dryer.

[0045] The technical solution of the present utility model comprises a timer 10, a wind speed control circuit 30, a wind temperature control circuit 40 and a main control circuit 20 to form a child lock circuit for a hair dryer. The wind speed control circuit 30 is configured to output a wind speed trigger signal when triggered; the wind temperature control circuit 40 is configured to output a wind temperature trigger signal when triggered; the main control circuit 20 is electrically connected to the timer 10, the wind speed input end of the main control circuit 20 is connected to the output end of the wind speed control circuit 30, and the wind temperature input end of the main control circuit 20 is connected to the output end of the wind temperature control circuit 40. The main control circuit 20 is configured to trigger the timer 10 to operate upon receiving a wind speed trigger signal or a wind temperature trigger signal, and is configured to output a locking control signal upon receiving at least one of the wind speed trigger signal or the wind temperature trigger signal before receiving a timing trigger signal output by the timer 10. The child lock circuit for a hair dryer of this solution is applied to a hair dryer to provide the hair dryer with a child lock function.

[0046] Furthermore, in one embodiment, the main control circuit 20 is also used to trigger the timer 10 to work when it receives the wind speed trigger signal or the wind temperature trigger signal, and output an unlocking control signal when it receives at least one of the wind speed trigger signal or the wind temperature trigger signal before receiving the timing trigger signal output by the timer 10.

[0047] In this embodiment, it can be understood that after the main control circuit 20 outputs a locking control signal and the hair dryer enters a locked state, the motor and the heating wire in the hair dryer stop working; if the user wants to unlock the hair dryer, the wind speed control circuit 30 or the wind temperature control circuit 40 can be triggered to output a wind speed trigger signal or a wind temperature trigger signal. When the main control circuit 20 receives the wind speed trigger signal and the wind temperature trigger signal in a preset order within a preset time, it will output a locking control signal to put the hair dryer into a locked state. The preset order can be to receive three wind temperature trigger signals first and then three wind speed trigger signals. The specific preset order can be set according to actual conditions and user needs. If the wind speed trigger signal and the wind temperature trigger signal are received in a preset order within a preset time under normal working conditions, the hair dryer continues to maintain the working state. It should be noted that the preset order for locking the hair dryer and the preset order for unlocking the hair dryer can be set to be the same or different.

[0048] In one embodiment, the wind speed control circuit 30 includes at least one wind speed button, which is connected to the wind speed input end of the main control circuit 20. The wind speed button is used to output a wind speed trigger signal to the main control circuit 20 when triggered.

[0049] In this embodiment, the wind speed control circuit 30 can be composed of one or more wind speed buttons connected in series with electronic components such as resistors; a wind speed button can output a wind speed trigger signal to the main control circuit 20 when pressed, and the main control circuit 20 controls the motor to operate at a preset speed, so that the hair dryer blows at a fixed wind speed. When the wind speed button is pressed again, the wind speed trigger signal is stopped from being output to the main control circuit 20, and the main control circuit 20 controls the motor to stop working, so that the wind speed of the hair dryer is zero. Multiple wind speed buttons can be multiple buttons corresponding to multiple fixed wind speed gears, or a button for increasing the wind speed and a button for decreasing the wind speed can be set to adjust the increase and decrease of the wind speed. The specific wind speed button can be set according to actual conditions and user needs.

[0050] In one embodiment, the air temperature control circuit 40 includes at least one air temperature button, which is connected to the air temperature input end of the main control circuit 20. The air temperature button is used to output an air temperature trigger signal to the main control circuit 20 when triggered.

[0051] In this embodiment, the air temperature control circuit 40 can also be composed of one or more air temperature buttons connected in series with electronic components such as resistors; a wind temperature button can output a wind temperature trigger signal to the main control circuit 20 when pressed, and the main control circuit 20 controls the heating wire to work according to the preset power, so that the hair dryer blows out wind at a fixed temperature. When the wind temperature button is pressed again, the wind temperature trigger signal is stopped from being output to the main control circuit 20, and the main control circuit 20 controls the heating wire to stop working, so that the wind temperature of the hair dryer is zero. Multiple wind temperature buttons can be multiple buttons corresponding to multiple fixed wind temperature gears, or a button for increasing the wind temperature and a button for decreasing the wind temperature can be set to adjust the increase and decrease of the wind temperature. The specific wind temperature button can be set according to actual conditions and user needs.

[0052] Furthermore, in one embodiment, the child lock circuit of the hair dryer may also include a cold wind control circuit, and the cold wind control circuit may be composed of a cold wind control button connected in series with a resistor and other electronic components. When the cold wind control button is triggered, a cold wind trigger signal is output. It is understandable that when the ambient temperature is high, the user does not need hot air or high temperature air when using the hair dryer. At this time, the user triggers the cold wind control circuit, and the main control circuit 20 will control the operation of the heating wire, reduce the working power of the heating wire or control the working power of the heating wire to 0. How the user controls the working power of the heating wire after triggering the cold wind control circuit can be set according to user needs. Figure 4 , Figure 4 This is a circuit structure diagram of an embodiment of the present solution including a wind speed control circuit 30, a wind temperature control circuit 40 and a cold wind control circuit. The wind speed control circuit 30, the wind temperature control circuit 40 and the cold wind control circuit are all set as a button, COLD is the cold wind control button, TEMP is the wind temperature control button, WIND is the wind speed control button, and each is connected in series with a resistor for current limiting.

[0053] Reference Figure 3 In one embodiment, the hair dryer child lock circuit further includes:

[0054] The motor drive circuit is connected to the wind speed output end of the main control circuit 20. The motor drive circuit is used to connect to the motor. The motor drive circuit is used to drive the motor to stop working when receiving the locking control signal.

[0055] In this embodiment, the motor drive circuit is a circuit for driving the motor in the wind tube, which can be composed of a motor drive chip, capacitors, resistors, switch tubes and other electronic components. The specific circuit can be referred to Figure 3 The parameters and numbers are for reference only and are not limited to this solution. Figure 2In which U, V and W represent the three phases of the three-phase motor. The motor drive circuit can drive the motor to stop working according to the locking control signal output by the main control circuit 20. The main control circuit 20 can also output a corresponding wind speed control signal to the motor drive circuit according to the wind speed trigger signal output by the wind speed control circuit 30 when the hair dryer is unlocked. The motor drive circuit can then drive the motor to work according to the wind speed control signal output by the main control circuit 20, thereby adjusting the wind speed of the hair dryer. For example, if the main control circuit 20 outputs a wind speed control signal to increase the wind speed, the motor drive circuit can drive the motor to increase the speed, thereby driving the wind speed blown out of the hair dryer to become faster. In this embodiment, the motor drive circuit can use an integrated MOS driver chip to prevent the phenomenon of single-chip computer deadlock and short circuit.

[0056] In one embodiment, the hair dryer child lock circuit further includes:

[0057] The heating wire control circuit is connected to the wind temperature output end of the main control circuit 20. The heating wire control circuit is used to connect the heating wire. The heating wire control circuit is used to control the heating wire to stop working when receiving the locking control signal.

[0058] In this embodiment, the heating wire control circuit can be composed of electronic components such as relays, temperature sensors, and resistors. The temperature sensor can monitor the temperature inside the hair dryer. The heating wire control circuit can also include a control chip. The control chip can be a simple switch, dimmer, or a more complex microcontroller (such as Arduino, single-chip microcomputer, etc.), which is used to receive feedback from the temperature sensor and control the working state of the heating wire. The heating wire can be turned on and off by the relay, thereby achieving current switching control. For example, when the heating wire control circuit receives the lock control signal output by the main control circuit 20, it will control the relay to disconnect, causing the heating wire to stop heating.

[0059] In one embodiment, the hair dryer child lock circuit further includes:

[0060] A wireless communication circuit is connected to the main control circuit 20. The wireless communication circuit is used to communicate with an external terminal. The wireless communication circuit is used to receive a locking trigger signal output by the external terminal and output it to the main control circuit 20. The main control circuit 20 is also used to output a locking control signal when receiving the locking trigger signal.

[0061] In this embodiment, the wireless communication circuit can be composed of a wireless communication chip. The wireless communication chip utilizes wireless communication technology. Wireless communication is a communication method that utilizes the ability of electromagnetic wave signals to propagate in free space to exchange information. The wireless communication chip can communicate with external terminals using 4G / 5G or other methods. The external terminal can be a mobile phone or Bluetooth device. The wireless communication chip functions as follows: The radio frequency chip is a wireless transmitter chip. When using discrete components, it simply performs modulation and transmission as a complete chip. In addition, to ensure stable data transmission, an antenna can be provided. The antenna is a converter that converts guided waves propagating on the transmission line into electromagnetic waves propagating in an unbounded medium, or vice versa. It is a component used in radio equipment to transmit or receive electromagnetic waves. Therefore, the wireless communication chip can receive the lock trigger signal output by the external terminal via the antenna and then output it to the main control circuit 20. By providing a wireless communication circuit in this embodiment, the user can remotely lock the hair dryer.

[0062] In one embodiment, the hair dryer child lock circuit further includes:

[0063] A power supply circuit, wherein the output end of the power supply circuit is connected to the power input end of the main control circuit 20 , and the power supply circuit is used to provide an operating voltage to the main control circuit 20 .

[0064] In this embodiment, the power supply circuit may include a battery and utilize a DC-DC circuit for voltage conversion. The power supply circuit converts the battery's output voltage into a suitable operating voltage for the main control circuit 20, thereby preventing the controller in the main control circuit 20 from receiving a higher operating voltage and causing damage, or from receiving a lower operating voltage and causing the device to malfunction. The power supply circuit may also provide operating voltage for the wireless communication circuit and the heating wire control circuit.

[0065] The present invention further provides a hair dryer comprising a motor, a heating wire, and the aforementioned child lock circuit for the hair dryer, wherein the output end of the hair dryer child lock circuit is connected to the input end of the motor and the input end of the heating wire, respectively. It is understood that since the hair dryer of the present invention utilizes the aforementioned child lock circuit for the hair dryer, the embodiments of the hair dryer of the present invention include all technical solutions of all embodiments of the aforementioned child lock circuit for the hair dryer, and the technical effects achieved are identical, and therefore will not be further elaborated upon here.

[0066] In one embodiment, the air duct further comprises:

[0067] A housing is formed with a housing cavity, and the motor and the heating wire are accommodated in the housing;

[0068] A printed circuit board is housed in the housing, and the hair dryer child lock circuit is arranged on the printed circuit board.

[0069] In this embodiment, the shell can be used to fix the position relationship of the printed circuit board, ensuring the safety and stability inside the accommodating cavity formed in the hair dryer shell. When the hair dryer is working, the position relationship of the circuit board will not change, and external gas or objects cannot fall on the circuit board, affecting the operation of the hair dryer child lock circuit on the circuit board.

[0070] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A child lock circuit for a hair dryer, characterized in that: include: Timer; The wind speed control circuit is used to output a wind speed trigger signal when triggered; The wind temperature control circuit is used to output a wind temperature trigger signal when triggered; A main control circuit is electrically connected to the timer, the wind speed input end of the main control circuit is connected to the output end of the wind speed control circuit, and the wind temperature input end of the main control circuit is connected to the output end of the wind temperature control circuit. The main control circuit is used to trigger the timer to work when it receives the wind speed trigger signal or the wind temperature trigger signal, and is used to output a locking control signal when it receives at least one of the wind speed trigger signal or the wind temperature trigger signal before receiving the timing trigger signal output by the timer.

2. The hair dryer child lock circuit according to claim 1, characterized in that: The main control circuit is also used to trigger the timer to work when it receives the wind speed trigger signal or the wind temperature trigger signal, and output an unlocking control signal when it receives at least one of the wind speed trigger signal or the wind temperature trigger signal before receiving the timing trigger signal output by the timer.

3. The hair dryer child lock circuit according to claim 1, characterized in that: The wind speed control circuit includes at least one wind speed button, which is connected to the wind speed input end of the main control circuit. The wind speed button is used to output a wind speed trigger signal to the main control circuit when triggered.

4. The hair dryer child lock circuit according to claim 1, characterized in that: The air temperature control circuit includes at least one air temperature button, which is connected to the air temperature input end of the main control circuit. The air temperature button is used to output an air temperature trigger signal to the main control circuit when triggered.

5. The hair dryer child lock circuit according to claim 1, characterized in that: The hair dryer child lock circuit also includes: The motor drive circuit is connected to the wind speed output end of the main control circuit. The motor drive circuit is used to connect to the motor. The motor drive circuit is used to drive the motor to stop working when receiving the locking control signal.

6. The hair dryer child lock circuit according to claim 1, characterized in that: The hair dryer child lock circuit also includes: The heating wire control circuit is connected to the wind temperature output end of the main control circuit. The heating wire control circuit is used to connect the heating wire. The heating wire control circuit is used to control the heating wire to stop working when receiving the locking control signal.

7. The hair dryer child lock circuit according to claim 1, characterized in that: The hair dryer child lock circuit also includes: A wireless communication circuit is connected to the main control circuit, and the wireless communication circuit is used to communicate with an external terminal. The wireless communication circuit is used to receive a locking trigger signal output by the external terminal and output it to the main control circuit. The main control circuit is also used to output a locking control signal when receiving the locking trigger signal.

8. The hair dryer child lock circuit according to claim 1, characterized in that: The hair dryer child lock circuit also includes: A power supply circuit, wherein the output end of the power supply circuit is connected to the power input end of the main control circuit, and the power supply circuit is used to provide an operating voltage to the main control circuit.

9. A hair dryer, characterized in that: The hair dryer comprises a motor, a heating wire and a child lock circuit for a hair dryer according to any one of claims 1 to 8, wherein the output end of the hair dryer child lock circuit is connected to the input end of the motor and the input end of the heating wire respectively.

10. The hair dryer according to claim 9, wherein: The air duct also includes: A housing is formed with a housing cavity, and the motor and the heating wire are accommodated in the housing; A printed circuit board is housed in the housing, and the hair dryer child lock circuit is arranged on the printed circuit board.

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