JPH02193604A - Portable heater - Google Patents

Abstract

PURPOSE:To suppress unnecessary heat generation as much as possible with comparatively simple constitution by lowering a commercial power source voltage by utilizing heater resistance and utilizing the obtained voltage for driving a relay. CONSTITUTION:The heater is provided with detection part 27 to output a control voltage Vc corresponding to the two of large and small changes in a voltage value Vs of a commercial alternative current power source 50, a switching element 39 to be interlocked with the control operation of the detection part, a relay 37, which regulates an electrification cycle with being interlocked with the turning-on and off operation of this switching element, and a heat generation part 2. The heat generation part switches a heater with being interlocked with the turning-on and off of a relay contact 13. Then, voltage output edges 40 and 40 are provided so that the partial voltage ratio of the commercial power source voltage by the heater can be made almost inversely proportional to the change ratio of the commercial power source voltage. Then, the driving voltage to a relay coil 38 is supplied from the voltage output edge provided in the heat generation part. Thus, even when the low driving voltage is used for the relay, the power source voltage is lowered exclusive in the heater part and a whole portable heater can be made simple and compact with suppressing the influence of the heat generation to an irreducible minimum.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a portable heating device such as a hair dryer or a hair iron, and particularly to a portable heating device such as a hair dryer or a hair iron, which can be used for special operations regardless of large differences in commercial AC power supply voltage. It relates to something that can be used as is without the need for.

[Prior art] Generally, commercial AC voltage ranges from 100V to 24V depending on the country.
Since the voltage is significantly different from 0V, there is a need for a device that takes into consideration the difference in voltage value in various electric appliances, and in particular, the development of a device that can respond to changes in input voltage without requiring special operations. There is.

In response to such demands, in portable heating devices such as hair dryers, when the commercial voltage of 200V is electrically detected, a thyristor connected in series with a relay is turned on, and the heater combination is connected to the relay. A device has been disclosed in which the consumption R and power in the heater can be automatically maintained constant regardless of the difference in power supply voltage between 100 and 200 V by making changes using contacts (for example, Japanese Patent Laid-Open No. 1983-1999) (See Publication No. 18932).

[Problems to be Solved by the Invention] However, this type of heating device requires the use of a relay because it is necessary to turn on and off a large current; however, since it is portable, the size of the relay that can be incorporated into the device is As a result, small relays with a drive voltage of about 30 V DC are often used, and a resistor is required to step down the commercial voltage of 200 V to 30 V when the relay coil is energized. However, even if the current flowing through the relay coil is small, the voltage dropped is large, so there is an inconvenience that the heat generated in the resistor is relatively large.

On the other hand, it has been proposed to connect a transistor in series with the relay coil, bypass the base voltage of the transistor with a thyristor, and energize the relay when 100V is detected, thereby reducing the power consumption in the step-down resistor. There are still many locks, including complicated control measures.

As a result of continued consideration in view of the above problems, the inventor of the present invention found that by changing the combination of heaters using relay contacts, it is possible to extract a substantially constant voltage regardless of a change in input voltage of 100 or 200 V. It has been found that by driving the relay coil using such a voltage, it is possible to completely eliminate the step-down resistor, or to reduce heat generation as much as possible even if a resistor is required, without complicating the controller.

The present invention has been made based on the above knowledge, and has a relatively simple configuration and eliminates unnecessary An object of the present invention is to provide a portable heating device that can suppress heat generation as much as possible.

[Means for Solving the Problems] The portable heating device according to the present invention, as shown in its schematic configuration in FIG. 27 and the detection section 2
7, a relay 37 whose energization timing is regulated in conjunction with the on/off operation of the switching element 39, and a heat generating section 2 that performs a predetermined heat generating operation.

The detection unit 27 outputs a predetermined control voltage Vc in response to a two-step change in the commercial AC voltage Vs, large and small.

The heat generating unit 2 includes a heater connected to a commercial AC power source 50.
A voltage output terminal 40 that is switched in conjunction with the on/off operation of the relay contact 13 and allows the voltage division ratio of the commercial power supply voltage by the heater to be approximately inversely proportional to the change rate of the input commercial power supply voltage.
・It has 40.

The present invention has the above configuration, and is characterized in that the driving JMS pressure v1 to the relay coil 38 is supplied from voltage output terminals 40, 40 provided in the heat generating section 2.

The heat generating unit 2 has one heater 10 with a resistance of 2R and two heaters 1 and 12 with a resistance value of R connected in series, and both ends of the heaters 10 and 11 connected in series are kept open. By connecting the relay contacts 13 in a short-circuitable manner, a voltage output terminal 40 is connected to both ends of the heaters 12 connected in series.
- 40 can be provided.

On the other hand, the switching element 39 is a thyristor that turns on when the voltage Vs increases, and is connected in parallel with the relay coil 38, and is connected between the relay coil 38 and the voltage output terminal 40 for voltage drop. A resistor 42 may be interposed.

[Function] With the above configuration, the input power supply voltage Vs is, for example, 1
Assume that the voltage has increased twice from a small voltage of 20V to a large voltage of 240V. Then, the detection unit 27 detects the change in voltage and sends the control voltage Vc to the switching element 39, as shown in FIG.
From the state a), the on/off state of the switching element 39 is switched as shown in FIG. 2(b). At the same time, the energization state to the relay coil 38 is also turned off, and as a result,
The combination of heaters in the heat generating section 2 is also changed using the relay contacts 13.

However, the voltage Vd output from the voltage output terminal 40 is 1
20 ■ If you set the partial voltage ratio to 1/1 during input, the change rate is twice as much as the 240v commercial ¥! , when the source voltage is input, the voltage division ratio is configured in advance to be 1/2 of 120V, that is, 1/2, so the commercial AC voltage Vs will fluctuate twice as much. Nevertheless, a substantially constant 120V is output.

Using this voltage, power is supplied to the relay coil 38,
The voltage difference from the power supply voltage Vs is lowered exclusively by the heater, and therefore stable operation is performed with the influence of heat generation due to the voltage drop being reduced as much as possible.

[Example] An example in which the present invention is applied to a hair dryer will be shown below.
It goes without saying that the present invention is small and portable, and can be implemented in various heating devices that use a commercial AC power source.

As shown in FIG. 3, the hair dryer according to the present invention includes a heat generating part 2 on the distal end side of a substantially cylindrical main body case 1, and a heat generating part 2 is connected to the heat generating part 2 from an air blowing part 3 provided on the proximal end side. By sending air toward the main body case 1, hot air A of a predetermined temperature can be released from the air outlet 4 of the main body case 1. Furthermore, a handle 5 having a cross-sectional shape that is large enough to be held by hand is attached to the proximal end side of the main body case l so that the handle 5 can be swept freely.
1ffi for the heat generating part 2 and the ventilation part 3 on the side surface of the
A slide knob 7 of a switch 6 regulating the ffi timing is provided, and a power cord 9 with a plug 8 at the tip extends from the lower end of the handle 5, and an electric circuit shown in FIG. 4 is installed inside the handle 5. Store it.

The heat generating section 2 is composed of a plurality of wire-wound heaters separated from each other or one heater divided into a plurality of sections by appropriately providing taps, and in this embodiment, as shown in FIG. 4, the resistance value is 260. The first coiled heater 10 has a resistance value of 13Ω, which is approximately half of that of the first heater 10, and the second coiled heater 11 has a resistance value of 7.5Ω and 5.5Ω, respectively, and the total value is 13Ω. 2. A belt-shaped third heater which is divided into two heaters so that the resistance value is equal to the resistance value of the heater 11], 2
a and the fourth heater], 2 b are connected in series 1. It is composed of

These heaters 10, 11, 12a, 12b are
As shown in FIG. 6 and FIG. 6, a plurality of boards are wound and mounted on a flat heater board 51 which is assembled in a criss-cross pattern. The fourth heater 12b, the first heater J, 0. The m2 heater 11 and the third heater 12a are set in this order. Therefore, the heater board 51 has a coil-shaped first coil at the center position in the longitudinal direction. The second heaters 10 and 11 are located on both sides, and the third and first belt-shaped heaters 10a and 12b are located on both sides.

In addition, the first heater 10. connected in series. ! :Second heater 1
1, and two sets of protection parts 14. It is connected to the plug 8 via the terminals a and 14b and the switching section 15.

Each of the protection parts 14a and 14b is equipped with a thermostat 16 and a temperature fuse 17 as a set, and
Continued L coater 10/11/1.2 a/J, 2
Each protection part 1.4a, 14b is connected to both ends of b in a distributed manner. Specifically, the protection part 14a connected to the first heater 10 side is provided close to the air outlet 4 side of the heater board 51, and in particular, the thermostat 16 is installed along the wind flow direction, and the other side is ], the thermostat 16 of 4b is the first heater 10 of the heater board 51
and between the windings of the fourth heater 12b, that is, the fourth heater 12b
It is installed on the leeward side of the windshield so as to be perpendicular to the wind flow direction A.

On the other hand, the temperature fuse 17 of the protection part 14b is connected to the fourth heater 1.
2b and the ventilation section 3.

By arranging it in this way, when the air volume from the air blower 3 falls below the specified value and the temperature inside the main body case 1 rises, the thermostat 16 first operates to cut off the electricity to the heat generating section 2, and then the thermostat 16 operates. If it is defective, the temperature fuse 17 is shut off to ensure double safety. especially,
thermostat) 16 and temperature fuse 17 as a set,
By arranging them in a distributed manner near the front and rear ends of the heater board, abnormalities can be detected over a wide range.

Note that the protective portion 14a near the front end is integrally assembled with the heater board 51. ! It may be placed inside the edge cylinder 52 to protect against direct radiant heat from the heater, or in a section of the insulating cylinder 52 where the thermostat 16 is located.
A partition wall 53 that divides the thermostat 16 into front and rear parts approximately at the center.
By providing the protective portion 14. near the rear end. By making a difference in the abnormal temperature detection timing due to b, and adjusting the abnormal temperature detection timing near the front end of the heater board 51, which inherently tends to be high, to be almost equal to the detection timing near the rear end. It is possible^8.

The switching unit 15 is a two-stage sliding switch 6 equipped with two switch contacts 8 and 19 in parallel, and a diode 20 is connected in series with the switch contacts 8 and 19.
A capacitor 21 for noise prevention is provided between both contacts 18 and 19. Therefore, when the slide knob 7 is advanced one step, the switch contact ]8 is first turned on, and the diode 20 is connected to the switch contact 1. A half-wave rectified commercial voltage is applied to the heat generating part 2, and the heat generating part 2
generates heat with half the power required at full power. When the switch knob 7 is advanced one step further, the switch contact 19 is also turned on, and by short-circuiting both ends of the diode 200, the commercial AC voltage Vs is directly applied to the heat generating part 2, and as a result, the voltage is The power of 21& during power supply is supplied to the heat generating section 2.

The blower unit 3 connects the input side of the diode bridge 220 to both ends of the second and fourth I7 heaters 11, 12a, and 12b connected in series via the motor resistor 23 for voltage drop, while rotating the fan 24 on the output side. A driving motor 25 is connected thereto. Note that if the motor resistor 23 is a wire-wound resistor and is placed between the fourth heater 1.2b on the heater board 51 and the first heater 10, heat generation can be utilized.

The present invention is characterized by the configuration of the control section 26 that regulates the on/off timing of the relay contact 13 provided in the heat generating section 2 described above.

The control unit 26 controls f! a detection unit 27 that detects the voltage value Vs of the commercial AC power supply 50 input into the handle 5 via the source plug 8 and outputs a predetermined control voltage Vc; and a control voltage output from the detection unit 27. It is composed of a switching section 28 that turns on and off in conjunction with Vc, and a power supply section 29 that supplies power to the switching section 28.

The detection unit 27 half-wave rectifies the input commercial AC voltage Vs with a diode 30, and further divides it with resistors 32a and 32b, thereby generating a detection voltage Vb proportional to the commercial AC voltage νS across the resistor 32b. At the same time, the voltage vb is applied to both ends of the Zener diode 34 via the voltage dividing resistors 33a and 33b and the smoothing capacitor 31. With this configuration, the input voltage Vs is 100V.
In the case of , the diode 34 continues to be off and the resistor 33b
When no voltage is generated across the resistor 33b and the input terminal 5 rises to 200V, the diode 34 is turned on and the 1tIII control voltage Vc smoothed by the capacitor 31 is generated across the resistor 33b. This control voltage Vc is further applied to the switching section 28 via a resistor 35.

The switching unit 28 is constructed by connecting the anode and cathode of a Zyristor provided as a switching element 39 in parallel with a relay coil 38 of a DC line 37 with an operating voltage of approximately 27V, and has the above-mentioned detection unit 27 connected to the gate. A control voltage Vc output from the circuit is applied.

The power supply unit 29 is connected to voltage output terminals 40 and 40 set at both ends of the heaters 11 and 12 of the heat generating unit 2, and stabilizes the voltage through a rectifying diode 41 and a step-down resistor 42. A voltage output terminal 40 is connected to both ends of a Zener diode 43 and a capacitor 44 connected in parallel.
A stabilized DC voltage Vm of approximately 27 V is output by applying the filter current 1/d taken out from the switching unit 2.
It is used for driving 8.

That is, while the input voltage to the detection unit 27 is 100V, the detection unit 27 does not output the control voltage Ve, and therefore the switching element 39 maintains the off state as shown in FIG. At the output voltage Vm, the relay coil 38 is energized 11 and the relay contact 13 of the heat generating part 2 is turned on. Then, the first heater 10 and the second heater 110
Both vents are short-circuited at the relay contact 13, and as a result, the commercial AC voltage Vs is applied to both ends of the third and fourth heaters 12a and 12b, but the second heater J has a low resistance value and is therefore exclusively blown. It acts as a conducting wire for the section 3 and the power supply section 29, and the power supply voltage of 100 V is applied to both sections 3 and 29 almost as is.

Next, when 200V is input through the plug 8 via I2, the detection section 27 starts outputting the control voltage Vc.

When the tit pressure Vc exceeds the ON voltage of the switching element 39, both ends of the relay coil 38 are connected to the switching element 3.
As a result of the short circuit between the anode and cathode of 9 as shown in FIG.
f! Since ffl is stopped and the relay contact 13 of the heat generating part 2 is turned off, a voltage of 200V is applied to both ends of the series-connected heaters 11 and 4th heaters 10-11, 12a, and 12b. Here, the resistance value of the first heater 10 is
Since it is twice the sum of the resistance values of the first to fourth heaters 11.l 2 a - 12b, all the heaters 10.
] The voltage division ratio of the input voltage by the heaters 11, 12a, and 12b for 1°12 is 1/2, so a voltage of 100V, which is half of 200V and approximately equal to when 100V is input, is taken out from the voltage output terminals 40 and 40. It is. At the same time, heaters 10, 11, 12a, 1 that contribute to heat generation
The resistance value of 2b is also the same as the heater 12 that generates heat when 100V is applied.
The resistance value is four times the resistance value of a and 12b, and the power consumption between the lines is maintained.

Furthermore, coil-shaped first and second coils are provided at the center of the heater board 51.
The heaters 10 and 11 are connected to third and fourth belt-shaped heaters on both sides.
Since heaters 12a and 1.2b are located, 12
At either 0V or 240V, the watt density within the heat generating section 2 is made uniform, and the distribution of air temperature is made uniform.

In addition, even in abnormal situations, especially when the fan rotation speed decreases due to hair entanglement, the thermostat 16 or temperature fuse 17 can be operated safely and reliably regardless of the posture of the main body.

Note that the switching element 39 may be replaced with a thyristor and may be replaced with a transistor or the like as appropriate. Furthermore, the switching element 39 may be connected in series with the relay coil 38, the relay contact 13 may be normally closed, and the relay 37 may be energized when 200V is applied. If the configuration is such that the voltage division ratio between the voltage output terminals 40 and 40 with respect to the voltage value applied to the entire group is inversely proportional to the rate of change in the voltage applied to the heat generating part 2, the number of heaters or relay contacts can be changed as appropriate. Of course, it can be implemented.

[Effects of the Invention] As described above, the present invention provides a voltage output terminal that divides the voltage of the commercial AC power supply 50 by the heater of the heat generating part 2 and outputs a substantially constant voltage in response to two levels of change in the power supply voltage. , Since the configuration is such that the drive current is supplied to the relay coil 38 by the voltage output from the output terminal 40, the relay is driven 1IJN,
Even if a low-voltage device is used, the drop in the R voltage occurs exclusively at the heater portion, and the overall device can be simplified and miniaturized while minimizing the effects of heat generation.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the basic configuration of the present invention, Figure 2 (a
) and (b) are explanatory diagrams showing the operation of FIG. 1. Figures 3 and 4 show implementation 1 of the present invention in a hair dryer.
．． Fig. 3 is a front view showing the external shape, and Fig. 4 is a front view showing the external shape.
The figure is an electrical circuit diagram. Figures 5 and 6 show how the heater and protection part are attached to the heater board, and Figure 5 (a)
) is a partially cutaway front view, FIG. 5(b) is a side view, FIG. 5(c) is a plan view, and FIG. 6 is an explanatory view showing the state of wire connection. 2... Heat generating part, ] 0... First heater, 11... Second heater, 12a... Third heater, 12b... Fourth heater, 13... Relay contact, 27... Detection unit, 38... Relay coil 5 39... Switching element, 40... Voltage output terminal. 42...Resistance for voltage drop. Issued by: Takashi Hashitona Figure 1 8 Figure 5 (a) Heater board Figure 6

Claims (1)

[Claims] 1. In response to changes in the commercial AC voltage Vs in two stages of magnitude,
A detection unit (27) that outputs a predetermined control voltage Vc; a switching element (39) that turns on and off with the control voltage Vc output from the detection unit (27); It consists of a relay (37) that regulates the timing of energization of the relay coil (38), and multiple heaters, and the heaters connected to the commercial AC power source (50) can be switched in conjunction with the on/off operation of the relay contacts. and a heat generating part (2) provided with voltage output terminals (40, 40) in which the voltage division ratio of the commercial AC voltage Vs by the heater is approximately inversely proportional to the rate of change of the commercial AC voltage Vs, the relay coil (38) A portable heating device characterized in that a driving voltage is supplied from voltage output terminals (40, 40) provided on a heat generating part (2). 2. The heat generating part (2) consists of one heater (1) with a resistance value of 2R.
0) and two heaters (11 and 12) with a resistance value of 1R are connected in series, and both ends of the series-connected heaters (10) and (11) are short-circuited with a normally open relay contact (13). In addition, voltage output terminals (40, 40) are provided at both ends of the heaters (11) and (12) that are connected in series, and the switching element (39) is used to increase the voltage of the commercial AC power supply voltage Vs. It is a thyristor that turns on when the relay coil (3
8) in parallel, and the relay coil (38
) and the voltage output terminals (40, 40), a resistor (42) for voltage drop is interposed.