A gradually cooling and heating hair dryer wind control system

Abstract

A gradually cooling and heating hair dryer wind control system, comprising a heating module, a switch module, a voltage reduction module, a square wave conversion module, and a control module. The voltage reduction module is used to reduce the voltage of the alternating current from the mains. The square wave conversion module is used to convert the output waveform of the alternating current into a square wave. The control module comprises a zero point detection unit, a wave cutting period setting unit, a delay unit, a cycle number setting unit, and a control signal output unit. The control signal output unit sequentially executes a plurality of wave cutting periods set by the cycle number setting unit, and outputs a signal to turn off the switch module at the zero point voltage in the plurality of wave cutting periods, and outputs a signal to turn on the switch module after extending the extension time set by the delay unit from the zero point voltage. This hair dryer wind control system can achieve a gradually heating or cooling effect in the process of turning on or off the hair dryer, thereby improving the user experience of the hair dryer.

Description

Technical Field

[0001] The present invention relates to the technical field of electric control of hair dryers, and in particular to a gradually cooling and heating wind control system of a hair dryer. Background Art

[0002] A hair dryer is composed of a set of electric heating wires and a small high-speed fan. When powered on, the electric heating wires will generate heat, and the wind blown out by the fan will become hot air after passing through the electric heating wires. If only the small fan rotates, but the electric heating wires are not hot, then the wind blown out is just wind without heat. The wind blown out by the hair dryer is dry wind. If used for too long, it is easy to cause moisture loss and cause heat damage.

[0003] Meanwhile, although the existing hair dryers have several gears for controlling the temperature of the hot air blown out and several gears for controlling the intensity of the air blown out, when switching between gears, the temperature often changes suddenly, such as suddenly hot or suddenly cold, which makes the use experience of the existing hair dryers poor and does not meet people's pursuit of high-quality life. Summary of the invention

[0004] In view of this, the present invention provides a gradually cooling and heating hair dryer air control system that can solve the above-mentioned problems.

[0005] A gradually cooling and heating hair dryer wind control system, which is electrically connected to a mains power supply, comprises at least one heating module, at least one switch module driving the heating module to work, a step-down module electrically connected to the mains power supply, a square wave conversion module electrically connected to the step-down module, and a control module controlling the working state of the switch module. The heating module generates heat when powered on. The switch module is used to control the on and off of the heating module. The step-down module is used to reduce the voltage of the alternating current from the mains power supply. The square wave conversion module is used to convert the output waveform of the alternating current into a square wave. The control module comprises a zero point detection unit, a wave cutting cycle setting unit, a delay unit, a cycle number setting unit, and a control signal output unit. The zero point detection unit is used to detect the zero point voltage of the square wave conversion module in real time. The wave cutting cycle setting unit is used to set the wave cutting cycle of the switch signal output by the control signal output unit. The delay unit is used to control the extension time of the control signal output unit outputting the control signal for opening or closing, and the extension time is calculated from the moment when each zero point voltage is detected and is less than half the wavelength of the square wave. The cycle number setting unit is used to set the number of wave cutting cycles set by the wave cutting cycle setting unit, and the number is greater than 1. Among the number of cycles set by the cycle number setting unit, the extension time of multiple cycles set by the wave cutting cycle setting unit is an increasing or decreasing series. The multiple extension times correspond to the multiple wave cutting cycles respectively. The control signal output unit sequentially executes the multiple wave cutting cycles set by the cycle number setting unit, and outputs the signal of turning off the switch module at the zero point voltage in the multiple wave cutting cycles, and outputs the signal of turning on the switch module after extending the extension time set by the delay unit from the zero point voltage, and the extension time is determined by the delay unit.

[0006] Furthermore, the block includes at least one heating wire, and each of the switch modules is connected in series with the heating module.

[0007] Furthermore, the gradually cooling and heating hair dryer wind control system includes two heating modules and two switch modules respectively connected in series with the heating modules, and the two heating modules and the two switch modules are electrically connected in parallel with each other.

[0008] Furthermore, the switch module includes a thyristor, and a control electrode of the thyristor is electrically connected to the control module.

[0009] Furthermore, the cathode of the thyristor is electrically connected to the heating module, the anode of the thyristor is connected to the mains electrode, the switch module also includes a capacitor C10 connected in series with the control electrode, and a voltage regulator diode DZ2 connected in series with the capacitor C10, a first switch terminal arranged between the capacitor C10 and the control electrode, and a second switch terminal electrically connected to the control module, and the heating module generates heat when the first and second switch terminals are electrically connected.

[0010] Furthermore, an anode of the voltage-stabilizing diode DZ2 is electrically connected to the control module, and a cathode thereof is electrically connected to the capacitor C10.

[0011] Furthermore, the voltage-dropping module includes at least one voltage-dropping resistor, one end of the voltage-dropping resistor is electrically connected to the mains, and the other end of the voltage-dropping resistor is grounded.

[0012] Furthermore, the square wave conversion module includes a transistor Q1, the base of the transistor Q1 is electrically connected to the reduction module, the collector is electrically connected, and the emitter is electrically connected to the control module.

[0013] Furthermore, the control module may include a central processing chip having a plurality of signal receiving pins and a plurality of control signal output pins.

[0014] Furthermore, the gradually cooling and heating hair dryer wind control system also includes a power module, which is electrically connected to the mains power and is used to provide the hair dryer with a voltage that meets its rated voltage.

[0015] Compared with the prior art, the gradually cooling and heating hair dryer wind control system provided by the present invention includes a switch module, a step-down module, a square wave conversion module, and a control module. At the same time, the control module includes a zero point detection unit, a wave cutting period setting unit, a delay unit, a cycle number setting unit, and a control signal output unit. The step-down module is electrically connected to the mains to receive a sinusoidal voltage, and the square wave conversion module converts the sinusoidal voltage into a square wave voltage, so that the square wave voltage is convenient for use by the control module. When the zero-point detection unit detects the 0-point voltage of the square wave voltage, the delay unit outputs a delay instruction to the control signal output unit, and the delay duration is calculated from the moment when the 0-point voltage is detected and is less than half the wavelength of the square wave, so that one half-wave of the sinusoidal wave voltage applied to the heating module by the switch module is phase-cut after every half full wave, and in each wave-cutting cycle, the phase-cutting time gradually increases or decreases, so that the power loaded on the heating module gradually increases or decreases, so that a gradual heating or cooling effect can be achieved in the process of turning on or off the hair dryer, thereby improving the user experience of the hair dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a principle block diagram of the gradually cooling and heating hair dryer air control system provided by the present invention.

[0017] Figure 2 for Figure 1 The circuit schematic diagram of the gradually cooling and heating hair dryer wind control system.

[0018] Figure 3 for Figure 1 The sine wave of the voltage output by the step-down module of the gradually cooling and heating hair dryer wind control system.

[0019] Figure 4 for Figure 1 The square wave of voltage output by the square wave conversion module of the gradually cooling and heating hair dryer wind control system.

[0020] Figure 5 for Figure 1 A signal waveform diagram of a driving signal output by a control module of a gradually cooling and heating hair dryer wind control system. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are further described in detail below. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0022] like Figure 1 to Figure 2As shown, it is a principle block diagram of the gradually cooling and heating hair dryer air control system provided by the present invention. The gradually cooling and heating hair dryer air control system is used to control the opening and closing of a hair dryer. The gradually cooling and heating hair dryer air control system is electrically connected to a mains power supply, so that the mains power supply provides power. The gradually cooling and heating hair dryer air control system includes at least one heating module 10, at least one switch module 20 that drives the heating module 10 to work, a step-down module 30 electrically connected to the mains power supply, a square wave conversion module 40 electrically connected to the step-down module 30, a control module 50 that controls the working state of the switch module 20, and a power supply module 60 for providing power to the hair dryer. It can be imagined that the gradually cooling and heating hair dryer air control system also includes some other functional modules, such as fan modules, thermal protection modules, electrical connection components and other technologies known to those skilled in the art, which will not be described in detail one by one here.

[0023] The number of the heating modules 10 can be set according to actual needs. In this embodiment, the number of the heating modules 10 is two. The two heating modules 10 are electrically connected in parallel. Each of the heating modules 10 includes at least one heating wire. When the heating wire is energized, the heating wire generates heat, so that the hair dryer can blow out hot air.

[0024] The number of the switch modules 20 should be equal to the number of the heating modules 10, and each of the switch modules 20 is connected in series with one of the heating modules 10, so that the switch module 20 controls the switch of the heating module 10. The switch module 20 includes a thyristor TR1. The control electrode of the thyristor TR1 is electrically connected to the control module 50, the cathode of the thyristor TR1 is electrically connected to the heating module 10, and the anode of the thyristor TR1 is connected to the mains electrode. Of course, it can be understood that the mains connected to the anode of the thyristor TR1 should be loaded on the thyristor TR1 after being stepped down or converted into a DC voltage, so that the thyristor TR1 can operate normally. In addition, in order to allow the thyristor TR1 to operate normally, the switch module 20 also includes a capacitor C10 connected in series with the control electrode, a voltage stabilizing diode DZ2 connected in series with the capacitor C10, a first switch terminal 21 arranged between the capacitor C10 and the control electrode, and a second switch terminal 22 electrically connected to the control module 50. When the first and second switch terminals 21 and 22 are electrically connected, the heating module 10 starts to be powered on and generates heat. The capacitor C10 is used to provide a stable voltage for the thyristor TR1, and the voltage-stabilizing diode DZ2 is used to provide direct current for the thyristor TR1. The working principle and characteristics of the voltage-stabilizing diode DZ2 itself should be prior art and will not be described in detail here. Specifically, the anode of the voltage-stabilizing diode DZ2 is electrically connected to the control module 50, and the cathode is electrically connected to the capacitor C10. The first and second switch terminals 22 can be a control terminal. When it receives a driving signal from the control module 50, the first and second switch terminals 22 are turned on or off, thereby driving the thyristor TR1 to turn on or off the heating module 10. When the heating module 10 has two heating wires, the switch module 20 will also have two thyristors to control their on and off respectively.

[0025] The step-down module 30 is connected to the mains and is used to reduce the mains to a voltage that can be processed by the square wave conversion module 40, such as 5 volts. It is conceivable that the circuit of the step-down module 30 includes at least one resistor, that is, the purpose of voltage reduction is achieved through the resistor, one end of the resistor is electrically connected to the mains, and the other end is grounded. In this embodiment, the step-down module 30 includes three resistors R14, R15, and R16 connected in series. Figure 3 As shown, it is a waveform diagram of the sinusoidal wave of the voltage output by the step-down module 30.

[0026] The square wave conversion module 40 is used to convert the alternating current sine wave output by the step-down module 30 into a square wave, so the square wave conversion module 40 includes a transistor Q1. The base of the transistor Q1 is electrically connected to the step-down module 30, the collector is grounded, and the emitter is electrically connected to the control module 50 and the power module. Since the base of the transistor Q1 is electrically connected to the step-down module 30, the voltage loaded on the base of the transistor Q1 is also alternating current, and its waveform is also a sine wave. The collector of the transistor Q1 is grounded, so only when the voltage on the base is greater than the voltage on the emitter, the emitter and the collector will be conductive. The base is loaded with alternating current, so in one cycle, only half of the wave voltage will make the emitter and collector conduct, while the other half of the wave voltage will not make the emitter and collector conduct. Therefore, the voltage on the emitter will change with the change of the voltage on the base, that is, when the voltage on the base is a positive voltage, the emitter and collector are conducted, so the voltage between the emitter and the ground is a constant value. When the voltage on the base is a negative voltage, the emitter and the collector are turned off, so the voltage between the emitter and the ground is 0, and therefore, the voltage between the emitter and the collector will form a square wave curve. Figure 4 is a waveform diagram of the voltage output by the square wave conversion module 40 .

[0027] The control module 50 is electrically connected to the emitter of the transistor Q1 of the square wave conversion module 40, so it can receive the square wave voltage formed between the emitter and the ground. The control module 50 includes a zero point detection unit 51, a wave cutting period setting unit 52, a delay unit 53, a cycle number setting unit 54, and a control signal output unit 55. The control module 50 may include a central processing unit, and a computer program is loaded on the central processing unit. The computer program can complete the corresponding above-mentioned functions according to the idea of ​​the present invention. As for the computer program itself, it should be prior art and will not be repeated here. In addition, it can be imagined that the central processing chip has a plurality of signal receiving pins and a plurality of control signal output pins, which are electrically connected to the corresponding square wave conversion module 40 and the switch module 20 respectively.

[0028] The zero-point detection unit 51 is used to detect the zero-point voltage of the square wave output by the square wave conversion module 40 in real time, that is, the zero-point detection unit 51 receives the square wave voltage formed between the emitter and the ground, so that when there is a zero-point voltage on the square wave voltage, the zero-point voltage can be detected. The wave cutting period setting unit 52 is used to set the wave cutting period of the control signal output unit 55 outputting the switch signal. In this wave cutting period, at least two complete sinusoidal wave periods are included. In this wave cutting period, the control module 50 can perform phase cutting on at least two complete sinusoidal waves. Phase cutting itself is a prior art, which is to cut off part of the band of the input voltage or current sinusoidal periodically, so as to achieve the purpose of reducing the input power. In this embodiment, in a wave cutting period, the bands at the same position need to be cut off to achieve the purpose of changing the input power. The delay unit 53 is used to control the extension time of the control signal output unit 55 outputting the control signal of opening or closing. The extension time is calculated from the moment when each zero-point voltage is detected and is less than half the wavelength of the square wave. By setting the extension time, the length of the band cut off in each wave cutting cycle can be set, so that the size of the input power in each wave cutting cycle can be set. Of course, it is conceivable that in the same wave cutting cycle, the band cut off in each sinusoidal voltage or current wave is the same. The number of cycles setting unit 54 is used to set the number of wave cutting cycles set by the wave cutting cycle setting unit 52, and the number is greater than 1. In this embodiment, the number of wave cutting cycles set by the cycle number setting unit 54 is 4, that is, it is repeated once after completing 4 wave cutting cycles. In the number of cycles set by the cycle number setting unit 54, the extension time of multiple wave cutting cycles set by the wave cutting cycle setting unit 52 is an increasing or decreasing series, and multiple extension times correspond to multiple wave cutting cycles respectively. Since the extension time of multiple wave cutting cycles is an increasing or decreasing series, the input power in each wave cutting cycle increases or decreases in one cycle. In actual use, people do not blow their hair all the time, but often turn on or off the hair dryer in sections. Therefore, a cycle is set, and the wind blown out by the hair dryer gradually becomes hot or gradually becomes cold in one cycle. In addition, even if people turn on the hair dryer all the time, it can also be cyclically gradually heated, which will not affect the effect of blowing hair. However, by setting the number of cycles, the cycle of the hair dryer gradually heating up or gradually cooling down can be set. The number of cycles set by the cycle number setting unit 53 allows the hair dryer to cyclically heat up or gradually cool down.

[0029] The control signal output unit 55 sequentially executes the multiple wave cutting cycles set by the cycle number setting unit 54, and outputs the signal of turning off the switch module at the zero voltage in the multiple wave cutting cycles and outputs the signal of turning on the switch module after extending the extension time set by the delay unit from the zero voltage, and the extension time is determined by the delay unit. Figure 5 is a waveform diagram of the control signal output by the control signal output unit 55 .

[0030] The power module 60 is connected to the AC power and is used to provide the hair dryer with a voltage that meets its rated voltage, so as to convert the AC power into a voltage acceptable to the heating module 10 or the fan. It is a prior art in itself and can be the same as the power module in an existing hair dryer, so it will not be described in detail here.

[0031] Compared with the prior art, the gradually cooling and heating hair dryer wind control system provided by the present invention includes a switch module 20, a voltage reduction module 30, a square wave conversion module 40, and a control module 50. At the same time, the control module 50 includes a zero point detection unit 51, a wave cutting period setting unit 52, a delay unit 53, a cycle number setting unit 54, and a control signal output unit 55. The voltage reduction module 30 is electrically connected to the mains power so as to receive a sinusoidal voltage, and the square wave conversion module 40 converts the sinusoidal voltage into a square wave voltage, so that the square wave voltage is convenient for the control module 50 to use. When the zero point detection unit 51 detects the 0 point voltage of the square wave voltage, the delay unit 53 outputs a delay instruction to the control signal output unit 55, and the delay duration is calculated from the moment when the 0 point voltage is detected and is less than the time of half the wavelength of the square wave, so that one half wave of the sinusoidal wave voltage applied to the heating module 10 by the switch module 20 is phase-cut after every half full wave, and in each wave-cutting cycle, the phase-cutting time gradually increases or decreases, so that the power loaded on the heating module gradually increases or decreases, so that the effect of gradual heating or cooling can be achieved in the process of turning on or off the hair dryer, thereby improving the user experience of the hair dryer.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention is included in the scope of the claims of the present invention.

Claims

1. A gradually cooling and heating hair dryer wind control system, which is electrically connected to a mains power supply, characterized in that: The gradually cooling and heating hair dryer wind control system includes at least one heating module, at least one switch module for driving the heating module, a step-down module electrically connected to the mains, a square wave conversion module electrically connected to the step-down module, and a control module for controlling the working state of the switch module. The heating module generates heat when powered on, the switch module is used to control the on and off of the heating module, the step-down module is used to reduce the voltage of the alternating current from the mains, and the square wave conversion module is used to convert the output waveform of the alternating current into a square wave. The control module includes a zero point detection unit, a wave cutting period setting unit, a delay unit, a cycle number setting unit, and a control signal output unit. The zero point detection unit is used to detect the zero point voltage of the square wave conversion module in real time, the wave cutting period setting unit is used to set the wave cutting period of the switch signal output by the control signal output unit, and the delay unit Used to control the extension time of the control signal output unit to output the on or off control signal, the extension time is calculated from the moment when each zero point voltage is detected and is less than half the wavelength of the square wave, the number of cycles setting unit is used to set the number of cutting wave cycles set by the cutting wave cycle setting unit, and the number is greater than 1, in the number of cycles set by the number of cycles setting unit, the extension time of multiple cycles set by the cutting wave cycle setting unit is an increasing or decreasing series, and the multiple extension times correspond to the multiple cutting wave cycles respectively, the control signal output unit executes the multiple cutting wave cycles set by the number of cycles setting unit in sequence, and in the multiple cutting wave cycles, outputs the signal that the switch module is turned off at the zero point voltage and outputs the signal that the switch module is turned on after extending the extension time set by the delay unit from the zero point voltage, and the extension time is determined by the delay unit.

2. The gradually cooling and heating hair dryer air control system according to claim 1, characterized in that: The heating module comprises at least one heating wire, and each of the switch modules is connected in series with the heating module.

3. The gradually cooling and heating hair dryer air control system according to claim 1, characterized in that: The gradually cooling and heating hair dryer wind control system includes two heating modules and two switch modules respectively connected in series with the heating modules. The two heating modules and the two switch modules are electrically connected in parallel with each other.

4. The gradually cooling and heating hair dryer air control system according to claim 1, characterized in that: The switch module includes a thyristor, and a control electrode of the thyristor is electrically connected to the control module.

5. The gradually cooling and heating hair dryer air control system according to claim 4, characterized in that: The cathode of the thyristor is electrically connected to the heating module, the anode of the thyristor is connected to the mains electrode, the switch module also includes a capacitor C10 connected in series with the control electrode, and a voltage regulator diode DZ2 connected in series with the capacitor C10, a first switch terminal arranged between the capacitor C10 and the control electrode, and a second switch terminal electrically connected to the control module, and the heating module generates heat when the first and second switch terminals are electrically connected.

6. The gradually cooling and heating hair dryer air control system according to claim 5, characterized in that: The anode of the voltage stabilizing diode DZ2 is electrically connected to the control module, and the cathode is electrically connected to the capacitor C10.

7. The gradually cooling and heating hair dryer air control system according to claim 1, characterized in that: The voltage-dropping module includes at least one voltage-dropping resistor, one end of the voltage-dropping resistor is electrically connected to the mains, and the other end of the voltage-dropping resistor is grounded.

8. The gradually cooling and heating hair dryer air control system according to claim 1, characterized in that: The square wave conversion module includes a transistor Q1, the base of the transistor Q1 is electrically connected to the step-down module, the collector is electrically connected, and the emitter is electrically connected to the control module.

9. The gradually cooling and heating hair dryer air control system according to claim 1, characterized in that: The control module includes a central processing chip having a plurality of signal receiving pins and a plurality of control signal output pins.

10. The gradually cooling and heating hair dryer air control system according to claim 1, characterized in that: The gradually cooling and heating hair dryer wind control system also includes a power module, which is electrically connected to the mains and is used to provide the hair dryer with a voltage that meets its rated voltage.

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