JP2021034259A - Power control circuit for home electric heating equipment and hair dryer including the same - Google Patents

Abstract

To provide a power control circuit for home electric heating equipment that can supply optimum power to a heater circuit of the home electric heating equipment regardless of a voltage of an AC power supply, and a hair dryer that can be used at optimum air temperature regardless of the voltage of the AC power supply.SOLUTION: A power control circuit for home electric heating equipment includes a supply path that transmits power supplied from an AC power supply to a heater circuit of household electric heating equipment, a switch that periodically intermittently interrupts the voltage waveform applied to the heater circuit, a phase control circuit that adjusts the phase of intermittent operation by the switch, a voltage detection circuit that detects the magnitude of the voltage of the AC power supply, and a control circuit that controls the power supplied to the heater circuit by controlling the amount of phase adjustment according to the output of the voltage detection circuit.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power control circuit for a living electric heating device that supplies optimum power to a heater circuit of the living electric heating device regardless of the voltage of an AC power source (hereinafter, referred to as “voltage type”), and a hair dryer equipped with the same. ..

Overseas compatible hair dryers (multi-voltage hair dryers) that can be used in areas where the voltage type of the AC power supply is different from that in Japan are well known. Conventional multi-voltage hair dryers are equipped with a manual switch that can be switched between "100-120V side" and "200-240V side", and the user can switch the switch to "100-" when using it in the United States within 110V, for example. After setting to "120V side", when using in the European region within 200V, set the switch to "200-240V side" and then insert the plug into the outlet (outlet) to make the hair dryer. Can be used safely (see References 1-3, etc.).

Jikkenhei 7-24207 Japanese Unexamined Patent Publication No. 55-122507 Japanese Unexamined Patent Publication No. 6-169810

However, if the plug is accidentally inserted into the outlet (outlet) with the switch set to "100-120V side" in the European region within the range of 200V, the heater circuit of the dryer may be overloaded and malfunction. is there.

On the contrary, if you accidentally insert the plug into the outlet (outlet) with the switch set to the "200-240V" side in Japan, which is within the 100V range, both the air volume and air temperature will be significantly low, so use it. I can't stand it.

In addition, a dryer designed to have an output wattage of 1200 W under a 100 V voltage in Japan has an output wattage of 1728 W under a 120 V voltage in the United States, so even if it does not lead to a failure, There is a problem that the air temperature and volume are too large and there is a risk of burns, and that a sufficient safety margin cannot be secured in the United States with Japanese standard plugs and electric wires (15Amax).

On the contrary, a dryer designed to have an output wattage of 1200 W under a 120 V voltage in the United States has a problem of inferior performance because an output wattage of only 833 W can be obtained under a 100 V voltage in Japan. is there.

In addition, a dryer designed to have an output wattage of 1000 W under 100 V voltage in Japan, which is in between these, is already on the market, but an output wattage of 1200 W, which is generally used in Japan, is available. I cannot deny the impression that it is inferior in terms of performance.

Therefore, the present invention has been made in view of such a problem, and is a power control circuit for a living electric heating device capable of supplying optimum power to a heater circuit of the living electric heating device regardless of the voltage of the AC power supply, and an AC. It is an object of the present invention to provide a hair dryer that can be used at an optimum air temperature regardless of the voltage of a power source.

The invention according to claim 1 for solving the above problems is a power control circuit for a living electric heating device that supplies optimum power to a heater circuit of the living electric heating device regardless of the voltage of the AC power supply, and is the AC. The supply path for transmitting the power supplied from the power source to the heater circuit of the living electric heating device, the switch for periodically intermittently interrupting the voltage waveform applied to the heater circuit, and the phase of the intermittent operation by the switch are adjusted. The phase control circuit, the voltage detection circuit that detects the magnitude of the voltage of the AC power supply, and the power supplied to the heater circuit by controlling the adjustment amount of the phase according to the output of the voltage detection circuit. It is characterized by including a control circuit for controlling.

In order to solve the above-mentioned problems, the present invention according to claim 2 is the power control circuit for the living electric heating device according to claim 1, wherein the living electric heating device is a hair dryer, and the motor circuit of the hair dryer. It is characterized in that both the electric power supplied to the heater circuit and the electric power supplied to the heater circuit are controlled.

In order to solve the above problems, the present invention according to claim 3 is the power control circuit for the living electric heating device according to claim 2, wherein the mode of the hair dryer is a plurality of modes in which at least one of the air temperature and the air volume is different. The control circuit is supplied to the motor circuit and the heater circuit according to the combination of the output of the voltage detection circuit and the mode set in the hair dryer. It is characterized by controlling electric power.

In order to solve the above problems, the present invention according to claim 4 is the electric power supplied to the motor circuit and the electric power supplied to the heater circuit in the electric power control circuit for a living electric heating device according to claim 2 or 3. It is characterized in that it controls the electric power individually.

In order to solve the above problems, the present invention according to claim 5 further includes a volume resistor whose resistance value changes according to a user operation in the power control circuit for a living electric heating device according to claim 4. The control circuit is characterized in that the power supplied to the motor circuit is controlled according to the combination of the output of the voltage detection circuit and the resistance value of the volume resistance.

In order to solve the above problems, the present invention according to claim 6 is the temperature at which the resistance value changes according to the air temperature of the hair dryer in the power control circuit for the living electric heating device according to claim 4 or 5. The control circuit further includes a detection element, and is characterized in that the control circuit controls electric power supplied to the heater circuit according to a combination of an output of the voltage detection circuit and a resistance value of the temperature detection element.

The present invention according to claim 7 is a hair dryer comprising the electric power control circuit for a living electric heating device according to any one of claims 2 to 6 in order to solve the above problems.

According to the power control circuit for a living electric heating device according to the present invention, the voltage waveform applied to the heater circuit is cycled instead of the manual switch that can be switched between the "100-120V" side and the "200-240V" side. A switch that is intermittent, a phase control circuit that adjusts the phase of intermittent operation by the switch, a voltage detection circuit that detects the magnitude of the voltage of the AC power supply, and an adjustment amount of the phase according to the output of the voltage detection circuit. Since it is provided with a control circuit for controlling, there are effects that (a) the user does not need to manually switch the switch, (b) failure of the heater circuit can be avoided, and (c) the performance of the heater circuit can be maintained.

According to the hair dryer according to the present invention, since the power control circuit for the living electric heating device according to the present invention is provided, (a) the user does not need to manually switch the switch, and (b) the failure of the heater circuit can be avoided. , (C') There is an effect that the performance of the air temperature can be maintained.

FIG. 1 is a diagram showing a circuit of a preferred first embodiment of a hair dryer equipped with a power control circuit for a living electric heating device according to the present invention. FIG. 2 is a correspondence table showing the relationship between the voltage value detected by the voltage detection circuit and the voltage type determined by the control circuit. FIG. 3 is a diagram for explaining the relationship between the phase adjustment amount and the voltage waveform. FIG. 4 is a diagram showing a phase modulation table according to the first embodiment. FIG. 5 is a diagram showing a circuit of the hair dryer according to the second embodiment. FIG. 6 is a diagram showing a phase modulation table according to the second embodiment. FIG. 7 is a diagram showing a circuit of the hair dryer according to the third embodiment. FIG. 8 is a diagram showing a phase modulation table applied to the heater side of the third embodiment. FIG. 9 is a diagram showing a phase modulation table applied to the motor side of the third embodiment.

Hereinafter, the electric power control circuit for a living electric heating device according to the present invention will be described in detail based on some preferable embodiments. Here, a hair dryer is taken as an example of a living electric heating device, but the present invention can also be applied to other living electric heating devices such as a water heater, a hair iron, a cooker, and a curler.

1. 1. First Embodiment 1-1. Configuration of Hair Dryer FIG. 1 is a diagram showing a circuit of a preferred first embodiment of a hair dryer equipped with a power control circuit for a living electric heating device according to the present invention. This hair dryer is a dryer that can be used safely and comfortably not only in the area within 100V but also in each area within 110V, 120V, 220V, and 240V.

As shown in FIG. 1, the hair dryer 1 of the present embodiment includes a heater circuit 12H equipped with a heater, a motor circuit 12M equipped with a motor 121, a thermal fuse 192, a power control circuit 101 for a living electric heating device, and the like. Be done. Of these, the motor 121 is a DC motor that can be driven with a voltage of, for example, 10V-32V. The power control circuit 101 for home electric heating equipment is a circuit that supplies optimum power to the motor circuit 12M and the heater circuit 12H of the hair dryer 1 regardless of the voltage type of the AC power supply 10. Therefore, the power control circuit 101 for the household electric heating device applies the power supplied from the AC power supply 10 to the supply path 11 that transmits the power to the motor circuit 12M and the heater circuit 12H of the hair dryer 1, and to the motor circuit 12M and the heater circuit 12H. A triac switch 14 that periodically interrupts the voltage waveform to be generated, a phase control circuit 15 that adjusts the phase of intermittent operation by the triac switch 14, a voltage detection circuit 16 that detects the magnitude of the voltage of the AC power supply 10, and AC. Controlling the amount of phase adjustment by the phase control circuit 15 according to the outputs of the phase / frequency detection circuit 191 that detects the phase and frequency of the voltage waveform of the power supply 10 and the voltage detection circuit 16 and the phase / frequency detection circuit 191. A control circuit 17 for controlling the electric power supplied to the motor circuit 12M and the heater circuit 12H is provided. The motor circuit 12M and the heater circuit 12H are connected to the AC power supply 10 in parallel, and the thermal fuse 192 and the triac switch 14 are connected to the supply path 11 shared by the motor circuit 12M and the heater circuit 12H. They are arranged at predetermined locations. Further, in the present embodiment, the triac switch 14 is taken as an example of a switch that periodically interrupts the voltage waveform, but another switch such as an SSR (solid state relay) may be used instead of the triac switch 14.

1-2. Regarding the electric power control mode Here, the control circuit 17 of the present embodiment collectively controls both the electric power supplied to the motor circuit 12M and the electric power supplied to the heater circuit 12H. Therefore, in the present embodiment, the voltage dropper resistor 122 is connected in series with the motor 121 on the side of the motor circuit 12M whose power consumption is relatively smaller than that of the heater circuit 12H, which causes an excess to the motor 121. It prevents the load from being applied.

1-3. Discrimination of voltage type FIG. 2 is a correspondence table showing the relationship between the voltage value detected by the voltage detection circuit and the voltage type discriminated by the control circuit. The voltage detection circuit 16 shown in FIG. 1 constantly outputs a signal corresponding to the magnitude of the voltage of the AC power supply 10 to the control circuit 17, and the control circuit 17 constantly outputs a signal according to the signal output from the voltage detection circuit 16, for example. The voltage type of the AC power supply 10 is determined by referring to the corresponding table shown in FIG.

Specifically, when the magnitude of the voltage of the AC power supply 10 belongs to the range of less than 106V, the control circuit 17 determines that the voltage type of the AC power supply 10 is "100V", which is the same as in Japan, and the AC power supply 10 If the magnitude of the voltage of the AC power supply 10 belongs to the range of 106V or more and less than 115V, the voltage type of the AC power supply 10 is determined to be "110V" similar to that of Taiwan, etc., and the magnitude of the voltage of the AC power supply 10 is 115V or more and less than 132V. If it belongs to the range of, the voltage type of the AC power supply 10 is determined to be "120V" similar to that of the United States, and if the voltage magnitude of the AC power supply 10 belongs to the range of 132V or more and less than 225V, the AC power supply If the voltage type of 10 is determined to be "220V" similar to China, Italy, etc., and the magnitude of the voltage of the AC power supply 10 belongs to the range of 225V or more and less than 235V, the voltage type of the AC power supply 10 is set to India, etc. If it is determined to be the same "230V" and the magnitude of the voltage of the AC power supply 10 belongs to the range of 235V or more and less than 264V, the voltage type of the AC power supply 10 is determined to be "240V" similar to that in the United Kingdom or the like.

1-4. Hair dryer mode The hair dryer 1 of the present embodiment is equipped with a plurality of modes in which at least one of the air temperature and the air volume is different, and the user can operate the changeover switch (not shown) to switch between the plurality of modes. It is possible to switch the mode of the hair dryer 1 between.
In the present embodiment, four modes, "OFF mode", "COOL mode", "SET mode", and "DRY mode", are assumed as the modes of the hair dryer 1. Of these, the "OFF mode" is a mode in which the dryer is stopped, the "COOL" mode is a mode for applying cold air to the hair to mainly finish the set, and the "SET mode" is weak. This is a mode for mainly setting the hair with warm air, and the "DRY mode" is a mode for mainly drying the hair with strong warm air.

1-5. Voltage waveform after phase modulation FIG. 3 is a diagram for explaining the relationship between the phase adjustment amount and the voltage waveform. The waveform shown in FIG. 3 is the voltage waveform of the supply path 11 to which the triac switch 14 is arranged, and FIGS. 3 (A-1) and 3 (B-1) show the case where the voltage type of the AC power supply 10 is 100 V. 3 (A-2) and (B-2) show that the voltage type of the AC power supply is 120V, and FIGS. 3 (A-3) and 3 (B-3) show that the voltage type of the AC power supply is 200V. In the case of, FIGS. 3 (A-4) and 3 (B-4) are waveforms when the voltage type of the AC power supply is 240 V.

In the present embodiment, when the phase control circuit 15 gives a trigger signal to the gate of the triac switch 14, the triac switch 14 is turned on, and the triac switch 14 is automatically turned off at the zero cross point of the voltage waveform. In FIG. 3, the period during which the hatching pattern is applied (length in the horizontal axis direction) indicates the period during which the triac switch 14 is turned on. Therefore, the area of the region where the hatching pattern is applied in FIG. 3 represents the magnitude of the effective voltage applied to the motor circuit 12M and the heater circuit 12H.

For example, even if the voltage type of the AC power supply 10 is the same 100V ((FIG. 3 (A-1), FIG. 3 (B-1)), FIGS. 3 (A-1) and 3 (B-1)). Since the deviation (phase difference Δ) between the rising timing of the voltage waveform and the ON timing of the triac switch 14 is different, the area of the black area, that is, the effective voltage applied to the motor circuit 12M and the heater circuit 12H. Therefore, in the present embodiment, the phase difference Δ is relatively small to set the effective voltage Vrms to 100 V (FIG. 3 (A-1)), or the phase difference Δ is relatively large to be effective. The voltage Vrms can be set to 40 V (FIG. 3 (B-1)).

On the contrary, for example, even if the voltage type of the AC power supply 10 is different between 100V and 240V (FIGS. 3 (A-1) and 3 (A-4)), the rising timing of the voltage waveform and the ON of the triac switch 14 By appropriately setting the deviation from the timing (phase difference Δ), the area of the black area, that is, the effective voltage Vrms applied to the motor circuit 12M and the heater circuit 12H can be set to a common value (100V). It is possible to

By the way, in this embodiment, the deviation (phase difference) between the rising timing of the voltage waveform and the ON timing of the triac switch 14 is controlled by the control circuit 17. For example, when the control circuit 17 detects the frequency of the voltage waveform of the AC power supply 10 via the phase / frequency detection circuit 191, the control circuit 17 triggers the triac switch 14 from the phase control circuit 15 at a frequency (double frequency) corresponding to the frequency. The signal is repeatedly output.

When the control circuit 17 detects the phase (rising timing) of the voltage waveform of the AC power supply 10 via the phase / frequency detection circuit 191, the control circuit 17 determines the phase difference from the rising timing to the trigger signal timing, which will be described later. Adjust according to the modulation table (Fig. 4). In this specification, the phase difference adjusted by the control circuit 17 is appropriately referred to as a "phase adjustment amount".

1-6. Phase Modulation Table FIG. 4 is a diagram showing a phase modulation table according to the first embodiment.
The control circuit 17 refers to the phase modulation table of FIG. 4 according to the combination of the voltage type of the AC power supply 10 detected based on the output of the voltage detection circuit 16 and the mode set in the hair dryer 1, and the combination thereof. By setting the phase adjustment amount associated with the above in the phase control circuit 15, the electric power supplied to the motor circuit 12M and the heater circuit 12H is collectively controlled.

As shown in FIG. 4, the phase modulation table stores the combination of the mode of the hair dryer 1 and the voltage type of the AC power supply 10 and the optimum phase adjustment amount for the combination in association with each other. Here, in the present embodiment, since the electric power supplied to the motor circuit 12M and the electric power supplied to the heater circuit 12H are collectively controlled, the phase modulation amount in this phase modulation table is basically the motor side and the heater. It is common with the side. The amount of phase modulation in FIG. 4 is an approximate value and does not necessarily match the actual numerical value and the actual accuracy. Further, in FIG. 4, the phase adjustment amount when the voltage type is 100V, the phase adjustment amount when the voltage type is 120V, the phase adjustment amount when the voltage type is 220V, and the phase adjustment amount when the voltage type is 230V are omitted. Actually, it is assumed that these phase modulation amounts are also stored in the phase modulation table. Further, in the present embodiment, since the phase modulation amount is common between the motor side and the heater side, it is not necessary to separately prepare the phase modulation amount on the motor side and the phase modulation amount on the heater side.

The amount of phase modulation in each mode is as follows.

OFF mode:
In the OFF mode, both the motor circuit 12M and the heater circuit 12H are set to a non-connected state (OPEN) to the AC power supply 10 by a changeover switch (not shown). Therefore, the effective voltage applied to the motor circuit 12M and the heater circuit 12H is set to 0V. The same OFF mode may be expressed by setting the phase modulation amount to πrad by the control circuit 17 while both the motor circuit 12M and the heater circuit 12H are connected to the AC power supply 10 (CLOSE). ..

COOL mode:
In the COOL mode, the heater circuit 12H is set to the state of not being connected to the AC power source 10 (OPEN) by a changeover switch (not shown), and the motor circuit 12M is connected to the AC power source 10 by a changeover switch (not shown) (CLOSE). Is set to. Then, when the voltage type is 100V, ..., 240V, the control circuit 17 sets the phase modulation amount to 0πrad, ..., 0.682πrad, respectively. Therefore, the effective voltage applied to the heater circuit 12H is set to 0V regardless of the voltage type of the AC power supply 10, and the effective voltage applied to the motor circuit 12M is set to 100V regardless of the voltage type of the AC power supply 10. ..

SET mode:
In the SET mode, both the motor circuit 12M and the heater circuit 12H are set to be connected to the AC power source 10 (CLOSE). Then, when the voltage type is 100V, ..., 240V, the control circuit 17 sets the phase modulation amount to 0.5πrad, ..., 0.754πrad, respectively. Therefore, the effective voltage applied to the motor circuit 12M and the heater circuit 12H is set to 70.7V regardless of the voltage type of the AC power supply 10.

DRY mode:
In the DRY mode, both the motor circuit 12M and the heater circuit 12H are set to be connected to the AC power source 10 (CLOSE). Then, when the voltage type is 100V, ..., 240V, the control circuit 17 sets the phase modulation amount to 0πrad, ..., 0.682πrad, respectively. Therefore, the effective voltage applied to the motor circuit 12M and the heater circuit 12H is set to 100V regardless of the voltage type of the AC power supply 10.

1-7. Effect of the first embodiment As described above, according to the hair dryer 1 according to the present embodiment, the user needs to manually switch the switch even when the hair dryer 1 is used overseas, which has a different voltage type from that in Japan. There is no effect that the failure of the motor circuit 12M and the heater circuit 12H can be avoided (safe use), and the performance of the air volume and the air temperature can be maintained (preventing the excess or deficiency of the air volume and the air temperature).

2. Second Embodiment 2-1. Configuration of Hair Dryer FIG. 5 is a diagram showing a circuit of the hair dryer according to the second embodiment. In FIG. 5, the same reference numerals are given to the elements common to those shown in FIG. Here, the differences from the first embodiment will be mainly described, and the common points will be basically omitted.

As shown in FIG. 5, the hair dryer 2 of the present embodiment includes a power control circuit 102 for the living electric heating device instead of the power control circuit 101 for the living electric heating device in the hair dryer 1 of the first embodiment, and is a motor. It is provided with a motor circuit 12M'instead of the circuit 12M.

The electric power control circuit 102 for the home electric heating device of the present embodiment individually controls the electric power supplied to the motor circuit 12M'and the electric power supplied to the heater circuit 12H. Therefore, the power control circuit 102 for the living electric heating device of the present embodiment is individually provided with the triac switch 14M on the motor side and the triac switch 14H on the heater side, and the phase control circuit 15M on the motor side and the phase control on the heater side. The circuit 15H and the circuit 15H are individually provided. Of these, the motor-side triac switch 14M is arranged in the motor-side independent supply path 11M, and the heater-side triac switch 14H is arranged in the heater-side independent supply path 11H.

Further, in the motor circuit 12M'of the present embodiment, the voltage dropper resistor 122 is omitted in the motor circuit 12M of the first embodiment. This is because, in the present embodiment, the electric power supplied to the motor side and the electric power supplied to the heater side are individually controlled, so that an excessive load on the motor 121 can be prevented even without the voltage dropper resistor 122.

2-2. Phase Modulation Table FIG. 6 is a diagram showing a phase modulation table according to the second embodiment. As shown in FIG. 6, the phase modulation table of the present embodiment individually stores the phase modulation amount to be applied to the heater side and the phase adjustment amount to be applied to the motor side.

The amount of phase modulation in each mode is as follows.

OFF mode:
In the OFF mode, both the motor circuit 12M'and the heater circuit 12H are set to a non-connected state (OPEN) to the AC power supply 10 by a changeover switch (not shown). Therefore, the effective voltage applied to the motor circuit 12M'and the heater circuit 12H is set to 0V. The same OFF mode can be set by setting the phase modulation amount on the motor side or the heater side to πrad while the motor circuit 12M'or the heater circuit 12H is connected to the AC power supply 10 (CLOSE). It may be expressed.

COOL mode:
In the COOL mode, the heater circuit 12H is set to a state of not being connected to the AC power source 10 (OPEN) by a changeover switch (not shown), and the motor circuit 12M is set to a state of being connected to the AC power source (CLOSE). Then, when the voltage type is 100V, ..., 240V, the control circuit 17 sets the phase modulation amount on the motor side to 0.692πrad, ..., 0.835πrad, respectively. Therefore, the effective voltage applied to the heater circuit 12H is set to 0V regardless of the voltage type of the AC power supply 10, and the effective voltage applied to the motor circuit 12M'is set to 40V regardless of the voltage type of the AC power supply 10. To. The same COOL mode may be expressed by setting the phase modulation amount on the heater side to πrad while the heater circuit 12H is connected to the AC power supply 10 (CLOSE).

SET mode:
In the SET mode, both the motor circuit 12M'and the heater circuit 12H are set to be connected to the AC power source 10 (CLOSE). Then, when the voltage type is 100V, ..., 240V, the control circuit 17 sets the phase modulation amount on the heater side to 0.5πrad, ..., 0.754πrad, respectively, and performs phase modulation on the motor side. The amounts are set to 0.761πrad, ..., 0.870πrad, respectively. Therefore, the effective voltage applied to the heater circuit 12H is set to 70.7V regardless of the voltage type of the AC power supply 10, and the effective voltage applied to the motor circuit 12M'is not related to the voltage type of the AC power supply 10 28. It is set to 3V.

DRY mode:
In the DRY mode, both the motor circuit 12M'and the heater circuit 12H are set to be connected to the AC power source 10 (CLOSE). Then, when the voltage type is 100V, ..., 240V, the control circuit 17 sets the phase modulation amount on the heater side to 0πrad, ..., 0.682πrad, respectively, and sets the phase modulation amount on the motor side. Set to 0.692πrad, ..., 0.835πrad, respectively. Therefore, the effective voltage applied to the heater circuit 12H is set to 100V regardless of the voltage type of the AC power supply 10, and the effective voltage applied to the motor circuit 12M'is set to 40V regardless of the voltage type of the AC power supply 10. To.

2-3. Effect of Second Embodiment As described above, according to the hair dryer 2 according to the present embodiment, the same effect as that of the hair dryer 1 of the first embodiment can be obtained. Further, according to the hair dryer 2 according to the present embodiment, since the voltage dropper resistor 122 (see FIG. 1) for reducing the load on the motor 121 is not required, energy loss due to conversion of excess energy into heat is not required. It is possible to prevent heat generation especially in the COOL mode, and there is also an effect of excellent coolness.

Incidentally, as described above, if the motor 121 operates at about 10 to 32 V and the required current is assumed to be approximately 1 A (or less), the excess energy is converted into heat by the voltage dropper resistor 122 (see FIG. 1). Since the amount of heat generated may reach as high as 100 W, in the present embodiment in which the voltage dropper resistor 122 is omitted, the heat generated by 100 W can be suppressed. Therefore, the effect of the COOL mode, which is mainly used for the purpose of setting warm hair, is improved. Another use of the COOL mode is to apply cold air to over-dried hair so that the moisture in the blown air is absorbed by the hair to a moisture content corresponding to its relative humidity and returned to the normal moisture content. However, if the heat generation in the COOL mode is suppressed as in the present embodiment, the relative humidity of the blown wind can be increased, so that more water can be absorbed by the hair. Therefore, the effect of the COOL mode of making the hair glossy is also enhanced.

3. 3. Third Embodiment 3-1. Configuration of Hair Dryer FIG. 7 is a diagram showing a circuit of the hair dryer according to the third embodiment. In FIG. 7, the same reference numerals are given to the elements common to those shown in FIG. Here, the differences from the second embodiment will be mainly described, and the common points will be basically omitted.

As shown in FIG. 7, the hair dryer 3 of the present embodiment includes the power control circuit 103 for the living electric heating device in place of the power control circuit 102 for the living electric heating device in the hair dryer 2 of the second embodiment. Is. The power control circuit 103 for the living electric heating device of the present embodiment is the power control circuit 102 for the living electric heating device of the second embodiment, in which the volume resistor 20M whose resistance value changes according to the user operation and the hair dryer 1 It is further provided with a temperature detecting element 20H whose resistance value changes according to the air temperature.

Then, the control circuit 17 of the present embodiment depends on the combination of the voltage type based on the output of the voltage detection circuit 16, the mode set in the hair dryer 3, and the set air volume indicated by the resistance value of the volume resistor 20M. It controls the power supplied to the motor circuit 12M. This makes it possible to obtain not only air volume stability regardless of the voltage type but also flexible air volume adjustment performance according to the user's operation.

Further, the control circuit 17 of the present embodiment has a heater circuit 12H according to a combination of a voltage type based on the output of the voltage detection circuit 16, a mode set in the hair dryer 3, and a resistance value of the temperature detection element 20H. Control the power supplied to. This makes it possible to obtain not only air temperature stability that does not depend on the voltage type but also air temperature stability that does not depend on the environmental temperature.

3-2. Hair dryer mode 3-2-1. Heater mode In this embodiment, four heater modes, "OFF mode", "55 ° C mode", "85 ° C mode", and "MAX mode", are assumed in order from the one having the lowest air temperature. The user of the hair dryer 3 of the present embodiment can switch the heater mode of the hair dryer 3 by operating a changeover switch (not shown).

3-2-2. Motor mode Further, in the present embodiment, two motor modes, "OFF mode" and "ON mode", are assumed as the motor mode of the hair dryer 3. The "ON mode" is a mode in which the air volume can be adjusted steplessly from the minimum air volume to the maximum air volume. The user of the hair dryer 3 of the present embodiment can switch the motor mode of the hair dryer 3 between "OFF mode" and "ON mode" separately from the heater mode by operating a changeover switch (not shown). .. In particular, when the motor mode is the "ON mode", the user can freely adjust the air volume by operating the volume resistor 20M.

3-3. Phase modulation table 3-3-1. Phase modulation table on the heater side FIG. 8 is a diagram showing a phase modulation table applied to the heater side of the third embodiment. As shown in FIG. 8, the phase modulation table on the heater side stores the amount of phase modulation to be applied to the heater side for each detected air temperature by the temperature detecting element 20H.

The amount of phase modulation in each mode is as follows.

OFF mode:
In the OFF mode, the heater circuit 12H is set to a non-connected state (OPEN) to the AC power supply 10 by a changeover switch (not shown). Therefore, the effective voltage applied to the heater circuit 12H is set to 0V. The same OFF mode may be expressed by setting the phase modulation amount on the heater side to πrad while the heater circuit 12H is connected to the AC power source 10 (CLOSE).

55 ° C mode:
In the 55 ° C. mode, the heater circuit 12H is set to be connected to the AC power source 10 (CLOSE). Then, the control circuit 17 sets the phase modulation amount on the heater side to 0.5πrad when the voltage type is 100V, 110V, or 120V, and when the voltage type is 220V or 240V, the heater side. The phase modulation amount of is set to 0.719πrad. Therefore, the effective voltage applied to the heater 12H is within the range of 70.7V to 84.8V regardless of the voltage type of the AC power supply 10. However, when the detected air temperature by the temperature detecting element 20H reaches 55 ° C. or higher, the phase modulation amount on the heater side is set to πrad and the effective voltage applied to the heater 12H is set to 0V regardless of the voltage type. Set. Therefore, the actual air temperature is controlled so as not to exceed 55 ° C.

85 ° C mode:
In the 85 ° C. mode, the heater circuit 12H is set to be connected to the AC power source 10 (CLOSE). Then, the control circuit 17 sets the phase modulation amount on the heater side to 0πrad when the voltage type is 100V, 110V, or 120V, and when the voltage type is 220V or 240V, the phase on the heater side. The modulation amount is set to 0.682πrad. Therefore, the effective voltage applied to the heater 12H is within the range of 100V to 120V regardless of the voltage type of the AC power supply 10. However, when the detected air temperature by the temperature detecting element 20H reaches 85 ° C. or higher, the phase modulation amount on the heater side is set to πrad and the effective voltage applied to the heater 12H is set to 0V regardless of the voltage type. Set. Therefore, the actual air temperature is controlled so as not to exceed 85 ° C.

MAX mode:
In the MAX mode, the heater circuit 12H is set to be connected to the AC power source 10 (CLOSE). Then, the control circuit 17 sets the phase modulation amount on the heater side to 0πrad when the voltage type is 100V, 110V, or 120V, and when the voltage type is 220V or 240V, the phase on the heater side. The modulation amount is set to 0.682πrad. Therefore, the effective voltage applied to the heater 12H is within the range of 100V to 120V regardless of the voltage type of the AC power supply 10. However, when the detected air temperature by the temperature detecting element 20H reaches 135 ° C. or higher, the phase modulation amount on the heater side is set to πrad and the effective voltage applied to the heater 12H is set to 0V regardless of the voltage type. Set. Therefore, the actual air temperature is controlled so as not to exceed 135 ° C.

3-3-2. Motor-side phase modulation table FIG. 9 is a diagram showing a phase modulation table applied to the motor side of the third embodiment. As shown in FIG. 9, the phase modulation table on the motor side stores the phase modulation amount to be applied to the motor side for each resistance value (for each set air volume) of the volume resistance 20M. The set air volume is each air volume from the minimum air volume to the maximum air volume.

The amount of phase modulation in each mode is as follows.

OFF mode:
In the OFF mode, the motor circuit 12M'is set to a non-connected state (OPEN) to the AC power supply 10 by a changeover switch (not shown). Therefore, the effective voltage applied to the motor circuit 12M'is set to 0V. The same OFF mode may be expressed by setting the phase modulation amount on the motor side to πrad while the motor circuit 12M'is connected to the AC power supply 10 (CLOSE).

ON mode (minimum air volume):
In the ON mode (minimum air volume), the motor circuit 12M is set to a state (CLOSE) connected to the AC power supply 10. Then, when the voltage type is 100V, ..., 240V, the control circuit 17 sets the phase modulation amount on the motor side to 0.813πrad, ..., 0.898πrad, respectively. Therefore, the effective voltage applied to the motor circuit 12M is set to 20V regardless of the voltage type of the AC power supply 10.

ON mode (maximum air volume):
In the ON mode (maximum air volume), the motor circuit 12M is set to a state (CLOSE) connected to the AC power supply 10. Then, when the voltage type is 100V, ..., 240V, the control circuit 17 sets the phase modulation amount on the motor side to 0.692πrad, ..., 0.835πrad, respectively. Therefore, the effective voltage applied to the motor circuit 12M is set to 40V regardless of the voltage type of the AC power supply 10.

ON mode (intermediate air volume):
Even in the ON mode (intermediate air volume), the motor circuit 12M is set to a state (CLOSE) connected to the AC power supply 10. Then, the control circuit 17 adjusts the phase modulation amount on the motor side between the value at the minimum air volume and the value at the maximum air volume. The adjustment amount is a value corresponding to the resistance value (set air volume) of the volume resistance 20M. Therefore, the phase modulation amount on the motor side is set to a value closer to the value at the minimum air volume as the set air volume is lower, and is set to a value closer to the value at the maximum air volume as the set air volume is higher. Therefore, the effective voltage applied to the motor circuit 12M is set to a value corresponding to the set air volume between 20V and 40V.

3-4. Effect of Third Embodiment As described above, according to the hair dryer 3 according to the present embodiment, not only the same effect as that of the hair dryer 2 of the second embodiment can be obtained, but also the air volume can be arbitrarily adjusted by the user. And the effect that the air temperature can be prevented from exceeding the set air temperature can be further obtained.

4. Supplement to the Embodiment As described above, the preferred embodiment of the present invention has been described in detail, but the present invention is not limited to the specific embodiment, and the gist of the present invention described in the claims. Needless to say, various modifications and changes are possible within the range of.

Therefore, in any of the above-described embodiments, the functions of some circuits may be mounted on other circuits. For example, at least a part of the functions of the phase control circuits 15, 15M and 15H may be mounted on the side of the control circuit 17, and at least a part of the functions of the phase / frequency detection circuit 191 may be mounted on the side of the control circuit 17. May be done. Further, at least a part of the functions of the voltage detection circuit 16 may be mounted on the control circuit 17 side.

Further, the electric power control circuits 101, 102, 103 for the living electric heating device of any of the above-described embodiments control both the electric power supplied to the motor circuit 12M or 12M'and the electric power supplied to the heater circuit 12H. However, only one of them may be controlled.

Further, since the hair dryer 3 of the third embodiment has particularly high safety, it is effective in a scene such as a pet or a child in which the person himself / herself cannot judge the excessive application of warm air or the rise in air temperature.

Further, in the above-described embodiment, the hair dryer is taken as an example of the living electric heating device, but the present invention can also be applied to other living electric heating devices such as a water heater, a hair iron, a cooker, and a curler.

1 Hair dryer 10 AC power supply 101 Power control circuit for living electric heating equipment 102 Power control circuit for living electric heating equipment 103 Power control circuit for living electric heating equipment 11 Supply path 12M Motor circuit 12M'Motor circuit 12H Heater circuit 14 Triac switch 15 Phase control circuit 15M Phase control circuit 15H Phase control circuit 16 Voltage detection circuit 17 Control circuit 192 Temperature fuse 2 Adryer 20M Volume resistance 20H Temperature detection element 3 Adryer

Claims (7)

It is a power control circuit for living electric heating equipment that supplies optimum power to the heater circuit of the living electric heating equipment regardless of the voltage of the AC power supply.
A supply path for transmitting the electric power supplied from the AC power source to the heater circuit of the household electric heating device, and
A switch that periodically intermittently interrupts the voltage waveform applied to the heater circuit,
A phase control circuit that adjusts the phase of intermittent operation by the switch,
A voltage detection circuit that detects the magnitude of the voltage of the AC power supply and
A control circuit that controls the power supplied to the heater circuit by controlling the adjustment amount of the phase according to the output of the voltage detection circuit.
A power control circuit for a living electric heating device, which is characterized by being provided with. In the power control circuit for a living electric heating device according to claim 1,
The living electric heating device is a hair dryer.
A power control circuit for a living electric heating device, which controls both the power supplied to the motor circuit of the hair dryer and the power supplied to the heater circuit. In the power control circuit for a living electric heating device according to claim 2.
The mode of the hair dryer can be switched between a plurality of modes in which at least one of the air temperature and the air volume is different.
The control circuit is characterized in that it controls the electric power supplied to the motor circuit and the heater circuit according to the combination of the output of the voltage detection circuit and the mode set in the hair dryer. Power control circuit for electric heating equipment. In the power control circuit for a living electric heating device according to claim 2 or 3.
A power control circuit for a living electric heating device, characterized in that the electric power supplied to the motor circuit and the electric power supplied to the heater circuit are individually controlled. In the power control circuit for a living electric heating device according to claim 4,
Further equipped with a volume resistor whose resistance value changes according to user operation,
The control circuit is a power control circuit for a living electric heating device, which controls power supplied to the motor circuit according to a combination of an output of the voltage detection circuit and a resistance value of the volume resistance. In the power control circuit for a living electric heating device according to claim 4 or 5.
Further provided with a temperature detecting element whose resistance value changes according to the air temperature of the hair dryer.
The control circuit is a power control circuit for a living electric heating device, which controls power supplied to the heater circuit according to a combination of an output of the voltage detection circuit and a resistance value of the temperature detection element. A hair dryer comprising the power control circuit for the living electric heating device according to any one of claims 1 to 6.

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