Self-adaptive voltage adjusting device of hair drier

Abstract

The utility model provides a self-adaptive voltage adjusting device of a hair drier. The self-adaptive voltage adjusting device comprises a power supply conversion unit, a power supply detection unit, a first switching unit, a second switching unit and a power supply control unit, when the power supply control unit judges that the voltage of the power supply converted by the power supply conversion unit is the first voltage, the power supply control unit controls the first switching unit and the second switching unit so as to connect the first heating unit and the second heating unit in parallel. When the power supply control unit judges that the voltage of the power supply power converted by the power supply conversion unit is a second voltage, the power supply control unit controls the first switching unit and the second switching unit to supply power to one of the first heating unit and the second heating unit. Therefore, the power supply modes of the first heating unit and the second heating unit can be automatically and correspondingly adjusted according to the voltage of the power supply power so as to adapt to different power supply voltages, and the phenomenon that the blower is burnt down due to the fact that the voltage is not switched to the corresponding voltage due to human negligence is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of hair dryers, and more specifically, particularly relates to an adaptive voltage regulating device for a hair dryer. Background Art

[0002] Generally, the mains power supply has different voltages, usually 100V~240V AC voltage input. Therefore, in order to meet various AC voltages, existing hair dryers are usually designed with switches for matching different AC voltage inputs. Generally speaking, existing hair dryers have a dual voltage hair dryer, and the switch is manually rotated to switch between 110V and 220V, so that the dual voltage hair dryer can be suitable for different AC voltage inputs.

[0003] However, since the dual voltage hair dryer needs to rely on manual adjustment of the switch, it is easy for the dual voltage hair dryer to burn out due to human negligence and failure to switch to the right voltage. Therefore, it is hoped that a new voltage adjustment device can improve the disadvantage that the hair dryer is easily burned out due to human negligence. Therefore, in view of this, the existing structure and defects are studied and improved, and a hair dryer adaptive voltage adjustment device is provided, in order to achieve a more practical purpose. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a hair dryer adaptive voltage adjustment device, which can automatically determine the input AC voltage and make adaptive adjustments to avoid the risk of hair dryer burning due to human negligence. This is achieved by the following specific technical means:

[0005] A hair dryer adaptive voltage adjustment device comprises a power conversion unit, the power conversion unit is connected to a mains power supply to receive mains power and convert the mains power into power supply power;

[0006] A power detection unit, the power detection unit is electrically connected to the power conversion unit to receive the power supply and generate a voltage detection signal according to the power supply voltage of the power supply;

[0007] A first switching unit, the first switching unit is electrically connected to the power conversion unit to receive power supply, and the power supply is connected to the first heating unit;

[0008] A second switching unit, the second switching unit is electrically connected to the power conversion unit to receive power supply, and the power supply is connected to the second heating unit;

[0009] A power control unit, the power control unit is electrically connected to the power detection unit to receive a voltage detection signal, and is electrically connected to the first switching unit and the second switching unit;

[0010] When the power control unit determines that the power supply is a first voltage according to the voltage detection signal, the power control unit controls the first switching unit and the second switching unit to connect the first heating unit and the second heating unit in parallel;

[0011] When the power control unit determines that the power supply is a second voltage according to the voltage detection signal, the power control unit controls the first switching unit and the second switching unit to supply power to one of the first heating unit and the second heating unit;

[0012] Wherein, the first voltage is smaller than the second voltage.

[0013] Furthermore, when the power control unit determines that the power supply is the second voltage according to the voltage detection signal, the power control unit controls the first switching unit and the second switching unit to supply power to the first heating unit and the second heating unit in an alternating manner.

[0014] Furthermore, it also includes: an over-temperature protection unit, which is electrically connected to the power control unit and is powered by the temperature detection unit, and generates a temperature detection signal according to the temperature detection unit.

[0015] Furthermore, it also includes: a button unit, the button unit includes a cold wind button, and the cold wind button is electrically connected to the power control unit.

[0016] Furthermore, the button unit includes a light signal control unit and a light signal unit, and the light signal control unit is electrically connected to the power supply control unit; the light signal unit includes a first input voltage indicator light and a second input voltage indicator light, and the first input voltage indicator light and the second input voltage indicator light are electrically connected to the light signal control unit.

[0017] Furthermore, the key unit includes a temperature key, and the temperature key is electrically connected to the power control unit.

[0018] Furthermore, the button unit includes a wind speed key, and the wind speed key is electrically connected to the power control unit.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] Since the power detection unit can automatically detect the power supply voltage of the power supply and generate a voltage detection signal accordingly, the power control unit can control the first switching unit and the second switching unit accordingly according to the determined voltage, so that the first heating unit and the second heating unit are connected in parallel or one of them is powered. In this way, the hair dryer can be applied to a variety of voltage inputs and can automatically adjust the power supply mode of the first heating unit and the second heating unit to avoid the risk of burning the hair dryer due to human negligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a block diagram of the adaptive voltage adjustment device for a hair dryer of the utility model.

[0022] Figure 2 The circuit diagram of the power conversion unit of the hair dryer adaptive voltage adjustment device of the utility model is shown in FIG. Figure 1 .

[0023] Figure 3 The circuit diagram of the power conversion unit of the hair dryer adaptive voltage adjustment device of the utility model is shown in FIG. Figure 2 .

[0024] Figure 4 The circuit diagram of the power detection unit of the adaptive voltage adjustment device for hair dryer of the utility model is shown in FIG. Figure 1 .

[0025] Figure 5 The circuit diagram of the power detection unit of the adaptive voltage adjustment device for hair dryer of the utility model is shown in FIG. Figure 2 .

[0026] Figure 6 The circuit diagram of the power control unit of the hair dryer adaptive voltage adjustment device of the utility model is shown as follows Figure 1 .

[0027] Figure 7 The circuit diagram of the power control unit of the hair dryer adaptive voltage adjustment device of the utility model is shown as follows Figure 2 .

[0028] Figure 8 The circuit diagram of the power control unit of the hair dryer adaptive voltage adjustment device of the utility model is shown as follows Figure 3 .

[0029] Fig. 9 The circuit diagram of the power control unit of the hair dryer adaptive voltage adjustment device of the utility model is shown as follows Figure 4 .

[0030] Fig.10 It is a circuit diagram of a first switching unit of the adaptive voltage adjustment device for a hair dryer of the utility model.

[0031] Fig.11 It is a circuit diagram of the second switching unit of the hair dryer adaptive voltage adjustment device of the utility model.

[0032] Fig.12 The utility model is a circuit diagram of a button unit of a hair dryer self-adaptive voltage adjustment device.

[0033] Fig.13 The utility model is a circuit diagram of an over-temperature protection unit of the hair dryer adaptive voltage adjustment device.

[0034] Fig.14 The circuit diagram of the motor drive unit of the adaptive voltage adjustment device for hair dryer of the utility model Figure 1 .

[0035] Fig.15 The circuit diagram of the motor drive unit of the adaptive voltage adjustment device for hair dryer of the utility model Figure 2 .

[0036] Fig.16 The circuit diagram of the motor drive unit of the adaptive voltage adjustment device for hair dryer of the utility model Figure 3 .

[0037] Fig.17 The circuit diagram of the motor drive unit of the adaptive voltage adjustment device for hair dryer of the utility model Figure 4 .

[0038] Fig.18 The circuit diagram of the light signal control unit of the hair dryer adaptive voltage adjustment device of the utility model Figure 1 .

[0039] Fig.19 The circuit diagram of the light signal control unit of the hair dryer adaptive voltage adjustment device of the utility model Figure 2 .

[0040] Fig. 20 The utility model is a circuit diagram of a button unit of a hair dryer self-adaptive voltage adjustment device.

[0041] Fig.21 The utility model is a circuit diagram of the light signal unit of the hair dryer adaptive voltage adjustment device.

[0042] Fig. 22 The circuit diagram of the light signal driving unit of the adaptive voltage adjustment device for hair dryer of the utility model Figure 1 .

[0043] Fig.23 The circuit diagram of the light signal driving unit of the adaptive voltage adjustment device for hair dryer of the utility model Figure 2 .

[0044] Fig.24 The circuit diagram of the upper and lower board connection ports of the utility model hair dryer adaptive voltage adjustment device Figure 1 .

[0045] Fig.25 The circuit diagram of the upper and lower board connection ports of the utility model hair dryer adaptive voltage adjustment device Figure 2 .

[0046] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0047] 10. Self-adaptive voltage adjustment device for hair dryer; 11. Power conversion unit; 111. Live wire connection port for power supply; 112. Negative ion neutral wire connection port; 113. Live wire connection port for heating unit; 114. Neutral wire connection port for power supply; 121. First switching unit; 1211. Neutral wire connection port for first heating unit; 122. Second switching unit; 1221. Neutral wire connection port for second heating unit; 123. Over-temperature protection unit; 1231. Temperature detection unit connection port; 13. Power detection unit; 131. Motor ground connection port; 14. Power control unit; 141. Program burning port; 15, motor drive unit; 151, motor drive port; 152, motor capacitor port; 16, button unit; 17, light signal control unit; 171, light board serial port connector; 172, light board serial port; 18, light signal unit; 191, first upper board port; 192, first lower board port; 193, second upper board port; 194, second lower board port; 20, AC power supply; 31, first heating unit; 32, second heating unit; 33, temperature detection unit; 40, blower motor; 50, negative ion unit. DETAILED DESCRIPTION

[0048] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0049] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Example:

[0052] See also Figure 1 As shown, the utility model provides a hair dryer self-adaptive voltage adjustment device. The hair dryer self-adaptive voltage adjustment device 10 includes a power conversion unit 11, a first switching unit 121, a second switching unit 122, a power detection unit 13, a power control unit 14 and a motor driving unit 15.

[0053] The power conversion unit 11 is electrically connected to the mains power source 20 to receive the mains power and convert the mains power into power supply power. The power detection unit 13 is electrically connected to the power conversion unit 11 to receive the power supply power and generate a voltage detection signal according to the power supply voltage of the power supply power. The first switching unit 121 is electrically connected to the power conversion unit 11 to receive the power supply power and is electrically connected to the first heating unit 31. The second switching unit 122 is electrically connected to the power conversion unit 11 to receive the power supply power and is electrically connected to the second heating unit 32. The power control unit 14 is electrically connected to the power detection unit 13 to receive the voltage detection signal and is electrically connected to the first switching unit 121 and the second switching unit 122. The motor drive unit 15 is electrically connected to the power conversion unit 11 to receive the power supply power and is electrically connected to the blower motor 40 for generating wind power.

[0054] When the power control unit 14 determines that the power supply is the first voltage according to the voltage detection signal, the power control unit 14 controls the first switching unit 121 and the second switching unit 122 to connect the first heating unit 31 and the second heating unit 32 in parallel. When the power control unit 14 determines that the power supply is the second voltage according to the voltage detection signal, the power control unit 14 controls the first switching unit 121 and the second switching unit 122 to supply power to one of the first heating unit 31 and the second heating unit 32. In this embodiment, the first voltage is less than the second voltage, the first heating unit 31 and the second heating unit 32 are respectively a heating wire, and the power measuring unit 13 includes a sampling resistor for detecting and sampling the power supply.

[0055] For example, the first voltage may be a common 110V mains voltage, and the second voltage may be a common 220V mains voltage. When the power control unit 14 determines that the power supply is a 110V mains voltage, the power control unit 14 connects the first heating unit 31 and the second heating unit 32 in parallel. At this time, the equivalent impedance of the first heating unit 31 and the second heating unit 32 in parallel will be reduced to half of the original impedance, that is, half of the impedance of the first heating unit 31. Assuming that the impedances of the first heating unit 31 and the second heating unit 32 are R respectively, the equivalent impedance of the first heating unit 31 and the second heating unit 32 is R / 2. Based on Ohm's law, when the input voltage is 110V, the equivalent impedance is R / 2, and the total current is 220 / R.

[0056] When the power control unit 14 determines that the power supply is 220V mains voltage, the power control unit 14 selects one of the first heating unit 31 and the second heating unit 32 for power supply. At this time, only one of the first heating unit 31 and the second heating unit 32 will be powered at the same time. Therefore, the overall equivalent impedance will remain the original impedance, that is, the impedance of the first heating unit 31. Assuming that the impedances of the first heating unit 31 and the second heating unit 32 are R respectively, the overall equivalent impedance at this time is R. Based on Ohm's law, when the input voltage is 220V, the equivalent impedance is R, and the total current remains 220 / R.

[0057] It can be seen that no matter the input voltage is 110V AC voltage or 220V AC voltage, the adaptive adjustment of the hair dryer adaptive voltage adjustment device 10 can maintain the same total current, thereby avoiding the risk of burning the hair dryer due to human negligence.

[0058] Furthermore, when the power control unit 14 determines that the power supply is the second voltage according to the voltage detection signal, the power control unit 14 controls the first switching unit 121 and the second switching unit 122 to supply power to the first heating unit 31 and the second heating unit 32 in an alternating manner.

[0059] See also Figures 1 to 3As shown, the power conversion unit 11 has a power live wire connection port 111, a negative ion neutral wire connection port 112, a heating unit live wire connection port 113, a power neutral wire connection port 114, and a negative ion live wire connection port 115. The power live wire connection port 111 is connected to the live wire of the mains power source 20, and the power neutral wire connection port 114 is connected to the neutral wire of the mains power source 20. The negative ion neutral wire connection port 112 and the negative ion live wire connection port 115 are electrically connected to the negative ion unit 50. The heating unit live wire connection port 113 is connected to the first heating unit 31 and the second heating unit 32.

[0060] Also, see Figure 1 , Figure 4 and Figure 5 As shown, the hair dryer adaptive voltage adjustment device 10 further includes an over-temperature protection unit 123. The over-temperature protection unit 123 is electrically connected to the power control unit 14, and is powered and connected to the temperature detection unit 33, and generates a temperature detection signal according to the temperature detection unit 33. The power control unit 14 receives the temperature signal and determines whether the temperature of the temperature detection unit 33 is greater than the over-temperature protection temperature. When the temperature of the temperature detection unit 33 is greater than the over-temperature protection temperature, the power control unit 14 controls the first switching unit 121 and the second switching unit 122 to stop supplying power to the first heating unit 31 and the second heating unit 32. In this way, over-temperature protection is provided to avoid the risk of burning due to excessive temperature. In the present embodiment, the temperature detection unit 33 is a thermistor, preferably a negative temperature coefficient (NTC) thermistor. In addition, the over-temperature protection unit 123 has a motor grounding connection port 131 for connecting to the grounding end of the blower motor 40 (not shown).

[0061] See also Figure 1 , Figures 6 to 9 As shown, the power control unit 14 also has a program burning connection port 141 for supplying power to an electronic device, so that the electronic device can burn a preset program into the power control unit 14 through the program burning connection port 141 to modify the program setting of the power control unit 14 .

[0062] See also Figure 1 , Fig.10 and Fig.11 As shown, the first switching unit 121 further comprises a first heating unit neutral line connection port 1211 for electrically connecting the first heating unit 31. The second switching unit 122 further comprises a second heating unit neutral line connection port 1221 for electrically connecting the second heating unit 32.

[0063] For further information, see Figure 1 and Fig.12 As shown, the hair dryer adaptive voltage adjustment device 10 further includes a button unit 16, and the button unit 16 includes a cold wind button. The cold wind button is electrically connected to the power control unit 14. When the cold wind button generates a cold wind signal, the power control unit 14 controls the first switching unit 121 and the second switching unit 122 to stop supplying power to the first heating unit 31 and the second heating unit 32, but still supplies power to the motor driving unit 15 to maintain the operation of the blowing motor 40, so that the hair dryer blows out cold wind.

[0064] See also Figure 1 and Fig.13 As shown, the over-temperature protection unit 123 further has a temperature detection unit connection port 1231 , which is powered and connected to the temperature detection unit 33 .

[0065] See also Figure 1 , Figures 14 to 17 As shown, the motor driving unit 15 further includes a motor driving connection port 151 and a motor capacitor connection port 152 . The motor driving connection port 151 and the motor capacitor connection port 152 are used to supply power to connect the blower motor 40 to drive the blower motor to operate.

[0066] In addition, the button unit 16 further includes a temperature button and a wind speed button. The temperature button and the wind speed button are respectively connected to the power control unit 14 , and the power control unit 14 is further electrically connected to the power conversion unit 11 .

[0067] When the temperature key generates a temperature switching signal, the power control unit 14 generates a temperature level adjustment signal and controls the power conversion unit 11 to adjust a power supply current supplied to the first heating unit 31 or the second heating unit 32, thereby adjusting the temperature of the hot air blown out by the hair dryer.

[0068] When the wind speed key generates a wind speed switching signal, the power control unit 14 generates a wind speed gear adjustment signal and controls the power conversion unit 11 to adjust the power supply voltage supplied to the blower motor 40, thereby adjusting the wind speed of the hot air blown out by the hair dryer.

[0069] See also Figure 1 , Figures 18 to 21 As shown, the hair dryer adaptive voltage adjustment device 10 further includes a light signal control unit 17 and a light signal unit 18. The light signal control unit 17 is electrically connected to the power control unit 14.

[0070] The light signal unit 18 includes a first input voltage indicator light, a second input voltage indicator light, a plurality of temperature indicator lights, and a plurality of wind speed indicator lights, which are connected to the light signal control unit 17 respectively.

[0071] When the power control unit 14 determines that the power supply is the first voltage according to the voltage detection signal, the power control unit 14 generates a first voltage signal to the light control unit 17. When the power control unit 14 determines that the power supply is the second voltage according to the voltage detection signal, the power control unit 14 generates a second voltage signal to the light control unit 17. When the light control unit 17 receives the first voltage signal, the light control unit 17 activates the first input voltage indicator light. When the light control unit 17 receives the second voltage signal, the light control unit 17 activates the second input voltage indicator light.

[0072] In this way, the current input voltage and the working status of the hair dryer adaptive voltage adjustment device 10 can be confirmed by the first input voltage indicator light and the second input voltage indicator light.

[0073] When the light control unit 17 receives the temperature level adjustment signal generated by the power control unit 14 , the light control unit 17 adjusts the activation modes of the temperature indicator lights.

[0074] When the light control unit 17 receives the wind speed level adjustment signal generated by the power control unit 14 , the light control unit 17 adjusts the activation modes of the wind speed indicator lights.

[0075] For example, if Fig.21 As shown, the plurality of temperature indicator lights are the first to fifth light emitting diodes D1 to D5, the plurality of wind speed indicator lights are the sixth to tenth light emitting diodes D6 to D10, the first input voltage indicator light is the eleventh light emitting diode D11, and the second input voltage indicator light is the twelfth light emitting diode D12.

[0076] When the power supply is the first voltage, the eleventh light emitting diode D11 is lit, and when the power supply is the second voltage, the twelfth light emitting diode D12 is lit.

[0077] When the activation mode of the temperature indicator lights is the first gear, the first light-emitting diode D1 is lit. When the activation mode of the temperature indicator lights is the second gear, the first to second light-emitting diodes D1 to D2 are lit. When the activation mode of the temperature indicator lights is the third gear, the first to third light-emitting diodes D1 to D3 are lit. When the activation mode of the temperature indicator lights is the fourth gear, the first to fourth light-emitting diodes D1 to D4 are lit. When the activation mode of the temperature indicator lights is the fifth gear, the first to fifth light-emitting diodes D1 to D5 are lit.

[0078] In addition, when the activation mode of the wind speed indicator lights is the first gear, the sixth light emitting diode D6 is lit. When the activation mode of the wind speed indicator lights is the second gear, the sixth to seventh light emitting diodes D6 to D7 are lit. When the activation mode of the wind speed indicator lights is the third gear, the sixth to eighth light emitting diodes D6 to D8 are lit. When the activation mode of the wind speed indicator lights is the fourth gear, the sixth to ninth light emitting diodes D6 to D9 are lit. When the activation mode of the wind speed indicator lights is the fifth gear, the sixth to tenth light emitting diodes D6 to D10 are lit.

[0079] Furthermore, please see Fig. 22 and Fig.23 As shown, the light signal control unit 17 further includes a light board serial port connection socket 171 and a light board serial port connection port 172 . The light board serial port connection socket 171 is connected to the light board serial port connection port 172 for electrically connecting the light signal control unit 17 and the power control unit 14 .

[0080] For further information, see Fig.24 and Fig.25 As shown, the hair dryer adaptive voltage adjustment device 10 further includes a first upper plate connection port 191, a first lower plate connection port 192, a second upper plate connection port 193 and a second lower plate connection port 194. In this embodiment, the above-mentioned units and electronic components can be respectively arranged on the upper plate and the lower plate, and the upper and lower plates are electrically connected through the first upper plate connection port 191, the first lower plate connection port 192, the second upper plate connection port 193 and the second lower plate connection port 194. Preferably, the first upper plate connection port 191 is electrically connected to the first lower plate connection port 192, and the second upper plate connection port 193 is electrically connected to the second lower plate connection port 194.

[0081] In summary, the hair dryer adaptive voltage adjustment device 10 can convert the household 100V~240V AC voltage input into high-voltage DC through the power conversion unit 11, and use the sampling resistor of the power detection unit 13 to detect and sample, and then feed the data back to the power control unit 14 for judgment to distinguish high and low voltages. And when the power supply after judgment is a higher voltage input of 220V~240V, the power control unit 14 can intelligently choose to drive the high-speed motor with a higher voltage and perform a higher voltage heating wire heating mode. And when the power supply after judgment is a lower voltage input of 100V~130V, the power control unit 14 can also intelligently choose to drive the high-speed motor with a lower voltage and perform a lower voltage heating wire heating mode.

[0082] In order to complete the above-mentioned different voltage heating operation functions, the hair dryer adaptive voltage adjustment device 10 adopts a dual heating wire circuit, and uses different circuit instructions to complete the heating work requirements of operating higher voltage and lower voltage. And in order to complete the above-mentioned different voltage motor operation functions, four capacitors are innovatively used to cooperate with two groups of power supply drive motor circuits, and different circuit instructions are used to complete the high-speed operation work requirements of operating higher voltage and lower voltage. In the limited space structure of the hair dryer, taking into account the high-speed and high-voltage smooth output of the air duct, two groups of heating wire related components and two groups of motor related components are placed at the same time to complete the working operation requirements of operating 100V~240V voltage.

[0083] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A hair dryer adaptive voltage adjustment device, characterized in that: include: A power conversion unit, the power conversion unit is connected to a mains power source to receive mains power and convert the mains power into power supply power; A power detection unit, the power detection unit is electrically connected to the power conversion unit to receive the power supply and generate a voltage detection signal according to the power supply voltage of the power supply; A first switching unit, the first switching unit is electrically connected to the power conversion unit to receive power supply, and the power supply is connected to the first heating unit; A second switching unit, the second switching unit is electrically connected to the power conversion unit to receive power supply, and the power supply is connected to the second heating unit; A power control unit, the power control unit is electrically connected to the power detection unit to receive a voltage detection signal, and is electrically connected to the first switching unit and the second switching unit; When the power control unit determines that the power supply is a first voltage according to the voltage detection signal, the power control unit controls the first switching unit and the second switching unit to connect the first heating unit and the second heating unit in parallel; When the power control unit determines that the power supply is a second voltage according to the voltage detection signal, the power control unit controls the first switching unit and the second switching unit to supply power to one of the first heating unit and the second heating unit; Wherein, the first voltage is smaller than the second voltage.

2. The hair dryer adaptive voltage adjustment device as claimed in claim 1, characterized in that: When the power control unit determines that the power supply is the second voltage according to the voltage detection signal, the power control unit controls the first switching unit and the second switching unit to supply power to the first heating unit and the second heating unit in an alternating manner.

3. The hair dryer adaptive voltage adjustment device as claimed in claim 1, characterized in that: Also includes: The over-temperature protection unit is electrically connected to the power control unit and is powered by the temperature detection unit, and generates a temperature detection signal according to the temperature detection unit.

4. The hair dryer adaptive voltage adjustment device as claimed in claim 1, characterized in that: Also includes: A button unit includes a cold wind button, and the cold wind button is electrically connected to the power control unit.

5. The hair dryer adaptive voltage adjustment device as claimed in claim 4, characterized in that: The button unit includes a light signal control unit and a light signal unit, and the light signal control unit is electrically connected to the power control unit; the light signal unit includes a first input voltage indicator light and a second input voltage indicator light, and the first input voltage indicator light and the second input voltage indicator light are electrically connected to the light signal control unit.

6. The hair dryer adaptive voltage adjustment device as claimed in claim 4, characterized in that: The key unit includes a temperature key, and the temperature key is electrically connected to the power control unit.

7. The hair dryer adaptive voltage adjustment device as claimed in claim 4, characterized in that: The button unit includes a wind speed key, and the wind speed key is electrically connected to the power control unit.

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