Electric hair drier with stepless speed regulation and temperature regulation functions

Abstract

The utility model discloses a stepless speed regulation and temperature regulation electric hair drier which comprises a main control circuit which is electrically connected with a motor driving circuit, a phase current detection circuit, a key circuit, a heating control circuit, a temperature detection circuit, a display circuit, a power supply circuit, a voltage sampling circuit and a zero point detection circuit. The motor driving circuit is electrically connected with the three-phase electrodeless motor; the key circuit comprises a first key circuit used for setting the wind speed and a second key circuit used for setting the temperature. The main control circuit controls the rotating speed of the three-phase electrodeless motor through the motor driving circuit according to the wind speed set by the first key circuit, and controls the heating temperature of the heating piece through the heating control circuit according to the temperature set by the second key circuit. By means of the technology, the temperature and the rotating speed are set through the keys, the three-phase stepless motor is adopted for air speed control, the main control circuit is adopted for precise control, and the stepless temperature and speed adjusting effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of stepless speed regulation electric hair dryers, in particular to a hair dryer with stepless speed and temperature regulation. Background Art

[0002] The hair dryer is a common household appliance primarily used for drying hair. Traditional hair dryers typically use fixed speeds and temperatures, preventing users from making precise adjustments based on their individual needs. Furthermore, the current drawn by a hair dryer during operation directly impacts its efficiency and safety, making real-time monitoring of the current draw essential. Furthermore, a light display can intuitively reflect the hair dryer's operating status, such as temperature and speed, thereby enhancing the user experience. 2) Existing Solutions: Existing hair dryers typically use mechanical methods to adjust the speed and temperature, requiring users to rotate a button or flip a switch to change the speed and temperature. While this adjustment method is simple and easy to use, it lacks precision and struggles to meet users' individual needs. Alternatively, some high-end hair dryers use electronic methods to adjust the speed and temperature, allowing users to make precise adjustments using buttons or knobs. However, these hair dryers are typically expensive and complex to operate, making them unsuitable for the average user. Utility Model Content

[0003] The purpose of the utility model is to provide a hair dryer with stepless speed and temperature regulation to solve the above problems existing in the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a hair dryer with stepless speed and temperature regulation, comprising a main control circuit, wherein the main control circuit is electrically connected to a motor drive circuit, a phase current detection circuit, a key circuit, a heating control circuit, a temperature detection circuit, a display circuit, a power supply circuit, a voltage sampling circuit and a zero point detection circuit.

[0006] The voltage sampling circuit is electrically connected to the power supply circuit; the motor drive circuit is electrically connected to the phase current detection circuit;

[0007] The zero point detection circuit is electrically connected to the power supply circuit; the motor drive circuit is electrically connected to the three-phase stepless motor; the heating control circuit is electrically connected to the heating plate;

[0008] The key circuit includes a first key circuit for setting the wind speed and a second key circuit for setting the temperature; the main control circuit controls the speed of the three-phase stepless motor through the motor drive circuit according to the wind speed set by the first key circuit, and controls the heating temperature of the heating plate through the heating control circuit according to the temperature set by the second key circuit.

[0009] Through the above technology, the temperature and speed are set by buttons, the wind speed is controlled by a three-phase stepless motor, and the main control circuit is used for precise control to achieve the effect of stepless temperature and speed regulation.

[0010] Furthermore, the main control circuit is a KY32MT028 control chip module.

[0011] Furthermore, both the first key circuit and the second key circuit use four-corner patch keys; the first key circuit and the second key circuit are connected in parallel, the first key circuit includes a resistor R25 and a four-corner patch key K2 connected in series; the second key circuit includes a resistor R11 and a four-corner patch key K4 connected in series.

[0012] Furthermore, the key circuit is also provided with a function key circuit, and the function key is used to control the main control circuit to memorize the currently set temperature and wind speed.

[0013] Furthermore, the motor drive circuit includes three-phase drive circuit units, which are a U-phase drive circuit unit, a V-phase drive circuit unit and a W-phase drive circuit unit, and each phase drive circuit unit is electrically connected to a corresponding phase current detection circuit.

[0014] Furthermore, the three-phase drive circuit units are all CS5755SDQ half-bridge IPM drive circuits.

[0015] Furthermore, the power supply circuit includes a KP3114 type PWM controlled power switch module U1, pin 4 of the PWM controlled power switch module U1 is connected to a 310V power supply, pin 2 of the PWM controlled power switch module U1 is simultaneously connected to one end of a capacitor C4, one end of a resistor R2, and one end of a resistor R43, the other end of the capacitor C4 and the other end of the resistor R2 are simultaneously connected to the negative electrode of a diode D3 and one end of an inductor L2, the positive electrode of the diode D3 is grounded, the other end of the resistor R43 is connected to one end of a resistor R38, the other end of the resistor R38 provides a 15V power supply voltage, the other end of the resistor R38 is simultaneously connected to one end of a resistor R4 and the other end of the inductor L2, the other end of the resistor R4 is connected to pin 3 of a 78L05 type 5V voltage regulator U2, pin 1 of the 5V voltage regulator U2 provides a 5V voltage, and pin 2 of the 5V voltage regulator U2 is grounded.

[0016] Furthermore, the zero point detection circuit includes an OR-3H4A-TP-G type photocoupler U3, the input end of the photocoupler U3 is connected to the live wire and the neutral wire of the grid power supply, the output end of the photocoupler U3 is simultaneously connected to the main control circuit, one end of the resistor R5 and one end of the capacitor C9, the ground end of the photocoupler U3 is grounded, the other end of the resistor R5 is connected to the 5V power supply, and the other end of the capacitor C9 is grounded.

[0017] Furthermore, the heating control circuit includes an OR-M3054-TP-G-(GK) type photoelectric coupler U4 as a control switch.

[0018] Furthermore, the display circuit includes a first LED matrix circuit connected to the main control circuit for lighting more LEDs as the wind speed increases, and a second LED matrix circuit for lighting more LEDs as the temperature increases.

[0019] Beneficial effects: The temperature and speed are set by buttons, the wind speed is controlled by a three-phase stepless motor, and the main control circuit is used for precise control to achieve stepless temperature and speed regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A circuit diagram showing a specific implementation example of a motor drive circuit and a phase current detection circuit;

[0021] Figure 2 A circuit diagram showing a specific implementation example of the main control circuit;

[0022] Figure 3 A circuit diagram showing a specific implementation example of a key circuit;

[0023] Figure 4 A circuit diagram of a specific implementation example of a power supply circuit;

[0024] Figure 5 This is a circuit diagram of a specific implementation example of a zero point detection circuit;

[0025] Figure 6 This is a circuit diagram of a specific implementation example of a heating control circuit;

[0026] Figure 7 A circuit diagram showing a specific implementation example of the circuit. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structures of the drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0028] Example:

[0029] like Figure 1 As shown, this embodiment provides a stepless speed and temperature regulation hair dryer circuit, including a main control circuit, the main control circuit is electrically connected to a motor drive circuit, a phase current detection circuit, a key circuit, a heating control circuit, a temperature detection circuit, a display circuit, a power supply circuit, a voltage sampling circuit and a zero point detection circuit.

[0030] The voltage sampling circuit is electrically connected to the power supply circuit; the motor drive circuit is electrically connected to the phase current detection circuit;

[0031] The zero point detection circuit is electrically connected to the power supply circuit; the motor drive circuit is electrically connected to the three-phase stepless motor; the heating control circuit is electrically connected to the heating plate;

[0032] The key circuit includes a first key circuit for setting the wind speed and a second key circuit for setting the temperature; the main control circuit controls the speed of the three-phase stepless motor through the motor drive circuit according to the wind speed set by the first key circuit, and controls the heating temperature of the heating plate through the heating control circuit according to the temperature set by the second key circuit.

[0033] like Figure 2 As shown, the main control circuit is a KY32MT028 control chip module. The KY32MT028 control chip system has a main frequency of up to 64MHz, supports single-resistor sensorless FOC control, supports 0.5s fast acceleration and deceleration, and has the advantages of low loss, stable operation, and low BOM cost.

[0034] like Figure 3As shown, both the first key circuit and the second key circuit use four-corner patch keys; the first key circuit and the second key circuit are connected in parallel, and the first key circuit includes a resistor R25 and a four-corner patch key K2 connected in series; the second key circuit includes a resistor R11 and a four-corner patch key K4 connected in series. Specifically, other function control key circuits are also provided in the circuit, such as a third key circuit connected in parallel with the first key circuit and the second key circuit, the third key circuit includes a resistor R26 and a four-corner patch key K3 in series, and specifically, the third key circuit is used to control the switch of the atomization module. Specifically, the key circuit is also provided with a function key circuit, and the socket J7 in the figure is used to install the function key, and the function key is used to memorize the currently set temperature and wind speed so that it can be used directly at the memorized temperature and wind speed.

[0035] The motor drive circuit includes three-phase drive circuit units, which are a U-phase drive circuit unit, a V-phase drive circuit unit and a W-phase drive circuit unit. Each phase drive circuit unit is electrically connected to a corresponding phase current detection circuit.

[0036] When implementing it specifically, Figure 1 As shown, the three-phase drive circuit units are all CS5755SDQ half-bridge IPM driver circuits. The CS5755SDQ is a highly integrated, high-reliability half-bridge IPM driver circuit primarily used for low-power motor drives such as fan motors and water pumps. It incorporates two fast-recovery MOSFETs and a half-bridge HVIC gate drive circuit. An integrated undervoltage protection function provides excellent protection and fail-safe operation. The CS5755SDQ also features an integrated bootstrap diode, simplifying peripheral circuitry.

[0037] like Figure 4As shown, the power supply circuit includes a KP3114 type PWM control power switch module U1, pin 4 of the PWM control power switch module U1 is connected to a 310V power supply, pin 2 of the PWM control power switch module U1 is simultaneously connected to one end of a capacitor C4, one end of a resistor R2, and one end of a resistor R43, the other end of the capacitor C4 and the other end of the resistor R2 are simultaneously connected to the cathode of a diode D3 and one end of an inductor L2, the anode of the diode D3 is grounded, the other end of the resistor R43 is connected to one end of a resistor R38, the other end of the resistor R38 provides a 15V power supply voltage, and the other end of the resistor R38 is ... Connect one end of resistor R4 and the other end of the inductor L2. The other end of the resistor R4 is connected to pin 3 of a 78L05 5V voltage regulator U2. Pin 1 of the 5V voltage regulator U2 provides a 5V voltage, and pin 2 of the 5V voltage regulator U2 is grounded. Specifically, multiple capacitors are connected in parallel between pin 2 of the 5V voltage regulator U2 and pin 1 of the 5V voltage regulator U2, including capacitors C7, C8, and C21 as shown in the figure. Specifically, an auxiliary circuit is set between the other end of the resistor R38 and the ground, including capacitor C5, resistor R6, diode D4, and capacitor C25 connected in parallel in the figure. Specifically, multiple electrolytic capacitors are connected in parallel between the 310V power supply and the ground, and the multiple electrolytic capacitors are C9, C1, and C2, respectively, to improve power supply stability. Specifically, a KBP310 low-power power adapter is set between the 310V power supply and the power grid. The KP3114 is a high-performance, low-cost PWM-controlled power switch suitable for offline, low-power step-down applications. It features simple peripheral circuitry and a low component count. Its built-in high-voltage MOSFET improves system surge resistance. Unlike traditional PWM controllers, the KP3114 does not have an internal fixed clock to drive the MOSFET, allowing the system switching frequency to automatically adjust with load changes. The chip also utilizes multi-mode PWM control technology, effectively simplifying peripheral circuit design, improving line and load regulation, and eliminating audible noise during system operation. Furthermore, the chip's internal peak current detection threshold automatically adjusts to the actual load, effectively reducing standby power consumption under no-load conditions. The KP3114 integrates a comprehensive set of self-recovering protection features, including VDD undervoltage protection, cycle-by-cycle current limiting, output overvoltage protection, overtemperature protection, overload protection, and VDD overvoltage protection.

[0038] Specifically, such as Figure 5As shown, the zero point detection circuit includes an OR-3H4A-TP-G type photocoupler U3, the input end of the photocoupler U3 is connected to the live wire and the neutral wire of the grid power supply, the output end of the photocoupler U3 is simultaneously connected to the main control circuit, one end of the resistor R5 and one end of the capacitor C9, the ground end of the photocoupler U3 is grounded, the other end of the resistor R5 is connected to the 5V power supply, and the other end of the capacitor C9 is grounded. The zero point detection circuit plays an important role in power electronics and electrical engineering. It is mainly used to detect the position and time of the zero point of the positive half-wave and negative half-wave of the alternating current. This detection method can obtain instantaneous and long-term change information such as the phase, frequency, and jitter of the alternating current, and is therefore often used in fields such as control, modulation, and protection. In terms of power supply control, the zero-crossing detection circuit can accurately control the switching timing, avoid the time difference and voltage deviation of the phase, thereby reducing power loss and saving electricity costs. For example, adding a zero-crossing detection circuit to an AC transformer can accurately switch as needed. In lighting control, zero-crossing detection circuits can precisely control the voltage across the lamp to achieve the ideal state, thereby extending its lifespan. In motor control, zero-crossing detection circuits can be used to determine the voltage and frequency to achieve the ideal motor speed. Using inverter control, motors can be started and stopped slowly, reducing mechanical damage and extending their lifespan. Furthermore, zero-crossing detection circuits are widely used in smart switches, dimmers / dimmers, and motor speed control products. By detecting the zero-crossing point, these devices can be switched on and off at zero voltage, suppressing startup inrush current and arcing, protecting components like relay contacts, and enabling brightness or motor speed adjustment.

[0039] like Figure 6 As shown, the heating control circuit includes an OR-M3054-TP-G-(GK) type photoelectric coupler U4 as a control switch.

[0040] like Figure 7 As shown, the display circuit includes a first LED matrix circuit connected to the main control circuit for lighting more LEDs as the wind speed increases and a second LED matrix circuit for lighting more LEDs as the temperature increases.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A hair dryer with stepless speed and temperature regulation, characterized in that: The main control circuit includes a motor drive circuit, a phase current detection circuit, a key circuit, a heating control circuit, a temperature detection circuit, a display circuit, a power supply circuit, a voltage sampling circuit and a zero point detection circuit. The voltage sampling circuit is electrically connected to the power supply circuit; the motor drive circuit is electrically connected to the phase current detection circuit; The zero point detection circuit is electrically connected to the power supply circuit; the motor drive circuit is electrically connected to the three-phase stepless motor; the heating control circuit is electrically connected to the heating plate; The key circuit includes a first key circuit for setting the wind speed and a second key circuit for setting the temperature; the main control circuit controls the speed of the three-phase stepless motor through the motor drive circuit according to the wind speed set by the first key circuit, and controls the heating temperature of the heating plate through the heating control circuit according to the temperature set by the second key circuit.

2. The stepless speed and temperature regulating hair dryer according to claim 1, characterized in that: The main control circuit is a KY32MT028 control chip module.

3. The stepless speed and temperature regulating hair dryer according to claim 1, characterized in that: The first key circuit and the second key circuit both use four-corner patch keys; the first key circuit and the second key circuit are connected in parallel, the first key circuit includes a resistor R25 and a four-corner patch key K2 connected in series; the second key circuit includes a resistor R11 and a four-corner patch key K4 connected in series.

4. The stepless speed and temperature regulating hair dryer according to claim 3, characterized in that: The key circuit is also provided with a function key circuit, and the function key is used to control the main control circuit to memorize the currently set temperature and wind speed.

5. The stepless speed and temperature regulating hair dryer according to claim 1, characterized in that: The motor drive circuit includes three-phase drive circuit units, which are a U-phase drive circuit unit, a V-phase drive circuit unit and a W-phase drive circuit unit. Each phase drive circuit unit is electrically connected to a corresponding phase current detection circuit.

6. The stepless speed and temperature regulating hair dryer according to claim 5, characterized in that: The three-phase drive circuit units are all CS5755SDQ half-bridge IPM drive circuits.

7. The stepless speed and temperature regulating hair dryer according to claim 1, characterized in that: The power supply circuit includes a KP3114 type PWM controlled power switch module U1, pin 4 of the PWM controlled power switch module U1 is connected to a 310V power supply, pin 2 of the PWM controlled power switch module U1 is simultaneously connected to one end of capacitor C4, one end of resistor R2 and one end of resistor R43, the other end of the capacitor C4 and the other end of the resistor R2 are simultaneously connected to the negative electrode of diode D3 and one end of inductor L2, the positive electrode of diode D3 is grounded, the other end of the resistor R43 is connected to one end of resistor R38, the other end of the resistor R38 provides a 15V power supply voltage, the other end of the resistor R38 is simultaneously connected to one end of resistor R4 and the other end of the inductor L2, the other end of the resistor R4 is connected to pin 3 of a 78L05 type 5V voltage regulator U2, pin 1 of the 5V voltage regulator U2 provides a 5V voltage, and pin 2 of the 5V voltage regulator U2 is grounded.

8. The stepless speed and temperature regulating hair dryer according to claim 1, characterized in that: The zero point detection circuit includes an OR-3H4A-TP-G type photocoupler U3, the input end of the photocoupler U3 is connected to the live wire and the neutral wire of the grid power supply, the output end of the photocoupler U3 is simultaneously connected to the main control circuit, one end of the resistor R5 and one end of the capacitor C9, the ground end of the photocoupler U3 is grounded, the other end of the resistor R5 is connected to the 5V power supply, and the other end of the capacitor C9 is grounded.

9. The stepless speed and temperature regulating hair dryer according to claim 1, characterized in that: The heating control circuit includes an OR-M3054-TP-G photoelectric coupler U4 as a control switch.

10. The stepless speed and temperature regulating hair dryer according to claim 1, characterized in that: The display circuit includes a first LED matrix circuit connected to a main control circuit for lighting more LEDs as the wind speed increases, and a second LED matrix circuit for lighting more LEDs as the temperature increases.

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