CN103844546B - Hair-protecting device - Google Patents

Abstract

Hair-protecting device possesses: power supply unit, and it supplies alternating current power supply；Heating part, it utilizes the electric power supplied from above-mentioned power supply unit to generate heat；Control portion, it controls the energising to above-mentioned heating part by switch portion；And test section, it detects the voltage of above-mentioned power supply unit.Above-mentioned control portion repeats following action: after the time reaching the assigned voltage in addition to 0V from the supply voltage detected by above-mentioned test section lights and have passed through the stipulated time, make above-mentioned switch portion start the energising to above-mentioned heating part.

Description

hair care device

technical field

The present invention relates to a hair care device for hair care.

Background technique

The hair care device includes a fan driven by a motor, and a heater for heating blown air from the fan. With regard to the heating control of the hair care device, the heating control has been performed by opening and closing the energization path to the heater by using a mechanical switch in the past, but in recent years, the phase control of the energization amount of the heater is performed by using a semiconductor switching element. (For example, refer to Japanese Patent Application No. 02-128705).

The above phase control is performed by controlling the conduction angle of the heater by the control unit through the switching element based on the zero-cross detection signal output from the zero-cross detection circuit for detecting the zero-cross of the AC power supply and energizing the heater.

If the switching element is energized synchronously with the zero-crossing detection signal, the conduction angle and the energization amount become larger and the air temperature becomes higher. If the switching element is energized between the zero-crossing signal and the next zero-crossing signal to reduce the conduction If the pass angle is small, the flow rate becomes smaller and the wind temperature becomes lower.

The zero-cross detection signal is a signal indicating the moment when the AC power reaches 0V. Therefore, when low-voltage external noise is superimposed on a detection unit or the like that detects the power supply voltage of the AC power supply, the heater may not be energized at a normal timing. In a hair care device provided with a high-voltage discharge unit for generating ions and generating charged fine particle water, it is notable that the heater is not energized at a normal timing due to noise generated by the high-voltage discharge unit.

Contents of the invention

The object of this invention is to solve such a problem, and to provide the hair care device which can accurately control the energization of a heater without being affected by external noise.

The hair care device according to the present invention includes: a power supply unit that supplies AC power; a heating unit that generates heat by using the power supplied from the power supply unit; a control unit that controls energization of the heating unit through a switch unit; A detection unit that detects the voltage of the power supply unit, wherein the control unit repeats the operation of causing the above-mentioned The switch unit starts energization to the heating unit.

The hair care device according to the present invention does not control the energization amount starting from the zero crossing of the voltage of the power supply unit, but controls the energization amount starting from the time when the power supply voltage reaches a predetermined voltage other than 0V. Therefore, even if external noise is superimposed on the detection unit, external noise below a predetermined voltage does not affect the control of the energized amount.

In the hair care device of the present invention, it is possible to accurately conduct electricity supply to the heating section while preventing erroneous detection due to external noise being superimposed on the detection section.

Description of drawings

Preferred embodiments of the present invention will be described in further detail. Other features and advantages of the present invention will be better understood with reference to the following detailed description and accompanying drawings.

FIG. 1 is a time chart showing the operation of an example of the hair care device according to the embodiment of the present invention.

Fig. 2 is a cross-sectional view of the hair care device according to the embodiment of the present invention.

Fig. 3 is a cutaway side view of the hair care device according to the embodiment of the present invention.

Fig. 4 is a block diagram related to heater control of the hair care device according to the embodiment of the present invention.

Fig. 5 is a circuit diagram related to heater control of the hair care device according to the embodiment of the present invention.

Fig. 6 is a characteristic diagram related to an AC power supply.

Fig. 7 is a circuit diagram of another example of the hair care device according to the embodiment of the present invention.

Fig. 8 is a timing chart showing the operation of another example of the hair care device according to the embodiment of the present invention.

Fig. 9 is a time chart showing the operation of another example of the hair care device according to the embodiment of the present invention.

Fig. 10 is a circuit diagram of still another example of the hair care device according to the embodiment of the present invention.

11 is a circuit diagram showing a high-voltage discharge circuit in still another example of the hair care device according to the embodiment of the present invention.

FIG. 12 is a perspective view showing a specific arrangement example of resistors R1 to R4 shown in FIG. 11 .

detailed description

The hair care device of the first invention includes: a power supply unit that supplies AC power; a heating unit that generates heat by using the power supplied from the power supply unit; a control unit that controls energization of the heating unit through a switch unit; and a detection section, which detects the voltage of the above-mentioned power supply section.

The control unit repeats an operation of causing the switch unit to start energizing the heating unit after a predetermined time has elapsed since the power supply voltage detected by the detection unit reaches a predetermined voltage other than 0V.

Since the energized amount is controlled starting from the point in time when the power supply voltage of the AC power supply (AC power supply voltage) reaches a specified voltage other than 0 V, superimposed external noise can be ignored as long as it is below the specified voltage. It may malfunction due to the influence of external noise. Therefore, it is possible to energize the heating portion at the correct timing when energization should be performed.

In the second invention, particularly, the control unit performs phase control in the second half cycle following the first half cycle and subsequent cycles based on the detection result in the first half cycle in which the power supply voltage reaches a predetermined voltage. . Therefore, even when the predetermined voltage is increased, the conduction angle of energization can be increased, and electromagnetic interference waves that become a problem in phase control can be suppressed.

In the third invention, particularly, the control unit includes a first timer and a second timer, and starts counting by the first timer and the second timer when it is detected that the power supply voltage has reached the predetermined voltage. When the time of the first timer is up (time up) and the time of the second timer is up, phase control of different half cycles is performed.

Thereby, phase control for one cycle can be performed by one detection unit.

In 4th invention, especially, the said control part starts energization of the said heating part within 0.5 ms from the time point of the zero crossing of the voltage of the said power supply part.

Accordingly, electromagnetic interference waves can be reliably suppressed.

In particular, in the fifth invention, the control unit transmits a signal to the switch unit a plurality of times in order to start energization of the heating unit.

Thus, even if the heating unit cannot be driven by the first signal from the control unit for some reason, the heating unit can be driven by the second and subsequent signals, so that the heating unit can be driven more reliably. Drive the heating unit.

In the 6th invention, especially, the said control part changes the timing which starts the energization to the said heating part according to the frequency of the electric power supplied from the said power supply part.

Accordingly, even when used in a region where the power supply frequency is different, the heating unit can be driven at an accurate timing without causing false triggering.

Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to this embodiment.

(Embodiment 1)

2 and 3 show an example of the structure of the hair care device according to the present invention. The casing is constituted by a cylindrical casing 1 and a handle 2. The front end surface and the rear end surface of the casing 1 are opened. link.

The handle 2 from which the power cord 25 is drawn out has a built-in air volume changeover switch 20 which also serves as a power switch, and the air volume changeover switch 20 is switched by a sliding operation part.

The casing 1 has a suction port 11 on the rear end and a discharge port 12 on the front end, and has wind tunnels 13 and 14 connected front and rear inside.

A heater (heating unit) 18 wound on a heater substrate 17 having a cross-shaped cross section is arranged in the wind tunnel 14 on the front side, and a nozzle 19 is connected to the front end of the wind tunnel 14 .

Between the inner surface of the casing 1 and the outer surfaces of the wind tunnels 13 and 14, as shown in FIG.

The electrostatic atomization unit 33 applies a high voltage generated by the high-voltage discharge circuit 32 to the moisture in the air condensed by cooling with a Peltier element to atomize the moisture, thereby generating charged fine particle water, The electrostatic atomization unit 33 sprays the above-mentioned fine particle water from the nozzle 34 .

FIG. 4 shows a block diagram related to the energization control of the heater 18 , and FIG. 5 shows a circuit configuration related to the energization control of the heater 18 . The heater 18 and the switch part 5 are connected in series to the power supply part 4 which is an AC power supply. In addition, the detection part 6 and the control part 8 which receives the output of the detection part 6 and turns on the said switch part 5 are connected to the power supply part 4. As shown in FIG. That is, the hair care device includes a power supply unit 4 , a heater (heating unit) 18 , a switch unit 5 , a control unit 8 , and a detection unit 6 . The switch unit 5 includes at least one switch element. That is, the switch unit 5 may include one switching element or a plurality of switching elements.

The detection unit 6 that receives electric power from the power supply unit 4 via the rectification unit 7 includes resistors 61 and 62 that divide the voltage half-wave rectified by the rectification unit 7 , a transistor 63 that applies the divided voltage to the base, and Resistor 64.

The control unit 8 to which an L-level (low-level) signal is input when the transistor 63 is turned on has, for example, a single-chip microcomputer as its main component. The control part 8 that receives the above-mentioned L level signal starts the counting of the two built-in timers (the first timer and the second timer), and outputs a pulse signal to the photoelectric triac when the time of each timer is up. (photo triac) The primary side of the 80.

The switch section 5 composed of a triac connected in series with the heater 18 is turned on by conduction of the secondary side of the above-mentioned photo triac 80 to energize the heater 18 . 51 is a DC power supply among the figure.

When the power is turned on by operating the air volume selector switch 20, a voltage is applied from the power supply unit 4 to the motor 15, and the fan 16 is driven at a rotational speed corresponding to the set air volume. Driven by the fan 16 , the air sucked from the suction port 11 passes through the wind tunnels 13 and 14 , and is ejected from the discharge port 12 through the nozzle 19 .

On the other hand, power supply to the heater 18 is not performed when the air temperature selector switch 30 is set to cool air, but is performed as follows when the air temperature selector switch 30 is set to hot air.

When the voltage of the power supply unit 4 as an AC power source rises from zero crossing to a predetermined voltage, the transistor 63 in the detection unit 6 is turned on, and an L level voltage is input to the input port of the control unit 8 .

The control unit 8 detects that the voltage of the power supply unit 4 has risen to a predetermined voltage based on the input of the L-level voltage, and starts counting by the two timers as described above.

Then, as shown in Fig. 1, when the time of the first timer is up (when the time reaches the count value T1, it is about 10 ms after the power frequency of the AC power supply is 50 Hz), the pulse signal (power signal) is sent to the photoelectric The triac 80 turns on the switch unit 5 .

In addition, when the time of the second timer is up (the time reaches the count value T2, approximately 20 ms after the power frequency of the AC power source is 50 Hz), a pulse signal is also sent to the photoelectric triac 80 to make the switch part 5 conduction.

Now when the specified voltage of the AC power supply is set to 8.6V, when the power supply frequency of the AC power supply is 50 Hz, it is detected by the detection part 6 that the power supply voltage reaches the specified voltage after 0.42 ms from the zero-crossing time point. Counting by the first timer and the second timer starts from the time point when the power supply voltage reaches the predetermined voltage.

Then, the control unit 8 performs the phase control of the next half cycle when the time of the first timer expires, and performs the phase control of the next half cycle when the time of the second timer expires.

Phase control is performed not for the half cycle in which voltage detection is performed but for the next half cycle and beyond. This is to increase the conduction angle and secure the energization amount regardless of the time until the power supply voltage reaches a predetermined voltage.

In addition, the hair care device according to the present embodiment is provided with two timers to perform not only the phase control of the next half cycle, but also the phase control of the next half cycle, so that one cycle can be performed by one voltage detection. phase control.

Moreover, since the predetermined voltage is set as high as 8.6V, even if external noise of 2V is superimposed on the detection unit 6 or its components, since the external noise is below the predetermined voltage (8.6V), errors can be prevented. The resulting false triggering of the heater 18 is detected.

Here, since the power supply unit 4 and the rectification unit 7 are connected by lead wires, external noise is likely to be superimposed, and the detection unit 6 may malfunction due to the noise. Therefore, by setting the predetermined voltage as high as possible so that it is less likely to be affected by noise below the predetermined voltage, malfunctions can be prevented. However, there is also a problem in setting the predetermined voltage too high.

That is, the higher the voltage of the power supply unit 4 serving as the AC power source, the larger the tolerance of the voltage obtained by dividing the voltage by the resistors 61 and 62 . In addition, the voltage waveform of the AC power supply is a sinusoidal curve, and the closer to the peak value of the voltage, the smaller the voltage change per unit time.

Therefore, the higher the predetermined voltage is set, the greater the tolerance of the time to reach the predetermined voltage (voltage reaching time from zero crossing) from the time point when the voltage of the AC power supply becomes 0V.

The specified voltage has a tolerance of 5% due to variations in resistance values and the like. For example, when the prescribed voltage is set to 20V, the AC power supply (100V, 50Hz) voltage reaches 20V after 452 μs (microseconds) from the time point of 0V. In the case of a specified voltage of 20V±5%, the voltage arrival time from zero crossing is 452μs±23μs.

In addition, since the frequency variation of the AC power supply is within 1%, it can be ignored within the range of the above-mentioned tolerance.

In the case of a specified voltage of 8.6V±5%, the voltage arrival time from zero crossing is 193μs±10μs (see Figure 6). From the viewpoint of these tolerances, it is necessary to make the tolerance of the voltage arrival time from the zero cross due to the tolerance of the predetermined voltage be 10 μs or less.

That is, in order to prevent malfunction due to external noise, not only must the predetermined voltage be set as high as possible, but also the tolerance of the voltage arrival time from zero crossing needs to be 10 μs or less.

The reason why the predetermined voltage is set to 8.6V is as described above. Incidentally, 8.6V±5%=8.17~9.03V, in this case, the voltage arrival time is 183μs~203μs, and the tolerance of the voltage arrival time is ±10μs. However, the present invention is not limited to the case where the predetermined voltage is 8.6V.

The circuit configuration of the detection unit 6 is also not limited to the above example. For example, as shown in FIG. 7 , rectification diodes 65 and 66 may be used for the detection unit 6 . The detection unit 6 can also adopt a configuration in which the resistor 62 in FIG. 7 is replaced by a constant voltage diode to increase a predetermined voltage.

The time-to-count value of the timer of the control part 8 is changed according to the setting of the air temperature selector switch 30 . With this change, the generation timing of the energization signal of the heater 18 is switched, and the energization rate of the heater 18 by the phase control is changed, so the wind temperature also changes.

(Embodiment 2)

Embodiment 2 has the same structure as Embodiment 1, but here, as shown in FIG. 8 , the hair care device of this embodiment performs the same half cycle (the first half cycle) The phase control of and the phase control of its next half cycle (second half cycle). Also in this case, it is possible to suppress the occurrence of malfunction due to the influence of external noise.

In addition, FIG. 8 shows a state in which the conduction angle of the phase control is reduced to lower the wind temperature. Incidentally, in the illustrated example, the time-to-count value T1 of the first timer is set to 5 ms, and the time-to-count value T2 of the second timer is set to 15 ms.

However, in the case of performing phase control of the same half cycle as the half cycle in which the voltage of the AC power source reaches the specified voltage, the heating can only be performed after the voltage of the AC power source reaches the specified voltage from the zero-crossing time point of the AC power source. energization of device 18.

Furthermore, when the time from the zero-crossing time point to the energization of the heater 18 within a half cycle becomes longer, generation of electromagnetic interference waves will be induced.

In order to secure a margin of 6 dB or more regarding electromagnetic interference waves (noise terminal voltage), it is preferable to set the time from when the AC power supply voltage reaches 0 V to energizing the heater 18 to be 500 μs or less.

Furthermore, when the predetermined voltage is set to the aforementioned 8.6V, if the power supply frequency is 50 Hz, the AC power supply voltage reaches 8.6V after 0.42 ms from the zero-cross time point. Therefore, considering the voltage fluctuation of the AC power supply, the tolerance of the resistance, the signal transmission delay time of the photoelectric triac 80, the delay of software processing, the tolerance of the timer, etc., within the same half cycle, the time from the zero-crossing time point is less than 500μs It is difficult to start energizing the heater 18 within a certain period of time.

Therefore, based on the viewpoint of being able to suppress the occurrence of misoperations caused by the influence of external noise and suppressing the generated electromagnetic interference waves, it is preferable to detect the half cycle when the voltage of the AC power source reaches a predetermined voltage and to detect the voltage of the AC power source based on the half cycle. When the voltage reaches the predetermined voltage, the energization control of the heater 18 is staggered by a half cycle.

In addition, the shift amount is not limited to half a cycle, and may be more than one cycle.

(Embodiment 3)

The structure of the third embodiment is the same as that of the first embodiment, and the operation of the third embodiment is almost the same as that of the first embodiment. The pulse signal is repeated multiple times at intervals of 0.5 ms as shown in FIG. 9 .

In addition, the interval between the first and the second or subsequent pulse signals does not need to be 0.5 ms, and an arbitrary interval can be taken between the first energization signal and the next zero crossing.

Even if the first pulse signal cannot be used to energize the heater 18 due to some reasons, the second and subsequent pulse signals can be used to energize the heater 18, so that the heater 18 can be more reliably energized. power ups.

In addition, in each of the above-mentioned examples, the case where the power frequency of the AC power source is 50 Hz has been described, but when the power frequency is 60 Hz, the time of the timer of the control unit 8 is changed to a count value to deal with it.

This is achieved by storing the time-to-count value corresponding to each power supply frequency in a table or the like provided in the control unit 8 in advance, and obtaining it by the control unit 8 by measuring the time interval for the AC power supply voltage to reach a predetermined voltage. power frequency. Then, by reading the corresponding time-to-count value, the control unit 8 matches the time from when the predetermined voltage is reached to when the heater 18 is energized with the power supply frequency.

As a result, even if the frequency of the power supply differs depending on the region where the hair care device is used, the heater 18 will not be erroneously activated, and the heater 18 can be reliably driven.

Also, in the case of a power supply frequency of 60 Hz, the AC power reaches 8.6 V after 0.38 ms from the zero-cross time point (in the case of 50 Hz, 0.42 ms as described above). In the case of maximizing the conduction angle in phase control, it is preferable to set the time-to-count value T1 of the first timer to 9.8 ms when the power frequency is 50 Hz, and set the time-to-count value T1 of the second timer to The count value T2 is set to 19.8ms. When the power supply frequency is 60Hz, the time-to-count value T1 of the first timer is set to 8.17ms, and the time-to-count value T2 of the second timer is set to 16.50ms.

In either case, the heater 18 is energized around 0.2 ms from the zero-cross time point, so from the viewpoint of the electromagnetic interference wave, it is sufficient to start the energization of the heater 18 within 500 μs or less. status.

(Embodiment 4)

In Embodiment 1, the operation of the switching unit 5 made of the triac is controlled by the photoelectric triac 80, but in Embodiment 4, as shown in FIG. , capacitor 93 and diode 94 constitute a circuit for controlling the operation of switch unit 5 . In this case, the circuit configuration can be made inexpensive and simplified.

The example in which the phase control of the heater 18 is performed starting from the time when the AC power rises to a predetermined voltage (8.6V) is shown, but it is of course possible to start from the time when the AC power drops to a predetermined negative voltage. for phase control.

(Embodiment 5)

11 is a circuit diagram of the high-voltage discharge circuit 32 and the discharge electrode 33a as the first electrode and the counter electrode 33b as the second electrode in the electrostatic atomization unit 33 in each of the above examples.

The electrostatic atomization unit 33 includes a Peltier element that condenses moisture in the air on the cooled discharge electrode 33 a by cooling the discharge electrode 33 a. Then, the high voltage generated by the high-voltage discharge circuit 32 is applied to the discharge electrode 33a to cause discharge between the discharge electrode 33a and the counter electrode 33b. The energy of this discharge electrostatically atomizes the condensed water on the discharge electrode 33 a to generate charged fine particle water, which is sprayed from the nozzle 34 .

As is clear from FIG. 11 , two resistors R1 and R2 are connected in series between the high voltage discharge circuit 32 and the discharge electrode 33 a, and two resistors R3 and R4 are also connected in series between the counter electrode 33 b and the high voltage discharge circuit 32 .

When the AC power supply voltage is as high as 110V or higher and high insulation is required for the hair care device, these resistors R1 to R4 function as protective impedances, thereby maintaining the miniaturization of the high voltage discharge circuit 32 .

That is, higher insulation is required when the AC power supply voltage is 110 V or higher than when the AC power supply voltage is 100 V, so that it is usually necessary to increase the insulation distance or use a large transformer. However, since the resistors R1 to R4 are present as protective impedances, the insulation distance and the transformer can be made the same as the case where the AC power supply voltage is 100V.

As shown in Figure 12, resistors R1 and R2 are arranged in the middle of the lead wire 35a connecting the high voltage discharge circuit 32 and the discharge electrode 33a (not shown in Figure 12), and resistors R3 and R4 are arranged in the middle of the lead wire 35a connecting the high voltage discharge circuit 32 and the opposite electrode 33a. The electrode 33b is connected in the middle of the lead wire 35b.

In addition, it is assumed that the above-mentioned resistors R1 to R4 are covered with a heat-shrinkable tube 36 . In addition, the lead wires 35a and 35b including the resistors R1 to R4 are separately arranged on the left and right (up and down in FIG. 12 ) of the outer peripheral surface of the wind tunnel 14 .

In addition, the reason why two resistors R1, R2 (R3, R4) are connected in series is because, even if one of the resistors is short-circuited when the AC power voltage is high (above 110V), the other resistor still functions to improve the protection safety. sex. It is also possible to connect more than three resistors in series to further improve the protection safety.

In addition, since it only needs to function as a protective impedance, a capacitor or a coil may be used instead of a resistor.

The nozzle 34 can also be used as the counter electrode 33 b in the high-voltage discharge circuit 32 . In this case, what is necessary is just to connect the lead wire 35b provided with resistance R3, R4 halfway, and the high voltage discharge circuit 32 and the nozzle 34.

In addition, the counter electrode 33b may be configured as a ground electrode connected to the ground.

Although the present invention was described using several preferred embodiments, various corrections and modifications can be made by those skilled in the art without departing from the original spirit and scope of the present invention, that is, without departing from the claims.

Industrial availability

As described above, the hair care device according to the present invention can prevent erroneous detection due to superimposition of external noise on the detection unit and can suppress generation of electromagnetic interference waves, so it can also be applied to applications such as load control on motors, for example.

Claims (7)

1. a hair-protecting device, it is characterised in that possess:

Power supply unit, it supplies alternating current power supply；

Heating part, it utilizes the electric power supplied from above-mentioned power supply unit to generate heat；

Control portion, it controls the energising to above-mentioned heating part by switch portion；And

Test section, the voltage of its above-mentioned power supply unit of detection,

Wherein, above-mentioned control portion repeats following action: from the supply voltage detected by above-mentioned test section Reach after time of the assigned voltage in addition to 0V lights and have passed through the stipulated time, to make above-mentioned switch portion open The beginning energising to above-mentioned heating part,

Above-mentioned control portion is based on detecting that above-mentioned supply voltage reaches the first half period of above-mentioned assigned voltage In testing result carry out the second half period after the most above-mentioned first half period and later cycle Phase controlling.

Hair-protecting device the most according to claim 1, it is characterised in that

Above-mentioned control portion possesses the first timer and the second timer, is detecting that above-mentioned supply voltage reaches The time point of above-mentioned assigned voltage starts above-mentioned first timer and the counting of above-mentioned second timer, upper Stating the time then with above-mentioned second timer time of the first timer is then carried out the different half periods Phase controlling.

Hair-protecting device the most according to claim 1, it is characterised in that

Above-mentioned control portion makes above-mentioned within the 0.5ms that the zero-crossing timing of the voltage from above-mentioned power supply unit is lighted Heating part is initially powered up.

Hair-protecting device the most according to claim 2, it is characterised in that

Above-mentioned control portion makes above-mentioned within the 0.5ms that the zero-crossing timing of the voltage from above-mentioned power supply unit is lighted Heating part is initially powered up.

5. according to the hair-protecting device described in any one in Claims 1 to 4, it is characterised in that

Above-mentioned control portion repeatedly sends signal in order to make above-mentioned heating part be initially powered up to above-mentioned switch portion.

6. according to the hair-protecting device described in any one in Claims 1 to 4, it is characterised in that

Above-mentioned control portion changes above-mentioned heating part according to the frequency of the electric power supplied from above-mentioned power supply unit Energising start timing.

Hair-protecting device the most according to claim 5, it is characterised in that

Above-mentioned control portion changes above-mentioned heating part according to the frequency of the electric power supplied from above-mentioned power supply unit Energising start timing.