JP2781163B2 - Warmer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warming device, and more particularly to a warming device taking into consideration the effects on the environment and the human body.

[0002]

2. Description of the Related Art Conventionally, as a warming device for warming the human body,
Various things such as electric blankets, electric carpets, foot warmers and the like have been developed. Since the negative potential has a therapeutic effect such as shoulder stiffness, for example, as disclosed in JP-A-62-74373 and JP-A-3-191967,
A warming device having a negative potential treatment function has been developed.

In such a warming device, a high-level negative potential (negative potential) is supplied from the negative potential side terminal while the positive potential side terminal of the negative potential generation circuit (negative potential generation circuit) is held at the ground potential.
Is generated, and the negative potential is applied to an electrode (electric floor) built in the heater body.

[0004] Usually, a resistor of a heater is commonly used as a heating element and an electric floor for providing a negative potential. Therefore, in a half cycle of the AC voltage, a heater made of a resistor is connected to the AC power supply to generate heat, the heater is cut off from the AC power supply in the remaining half cycle of the AC voltage, and a negative potential is generated by the negative potential generating circuit. A high voltage is applied to the heater.

FIG. 5 is a circuit diagram showing an example of a conventional warming device. In FIG. 5, outlet (connection port for power supply)
One electrode n1 of 300 is connected to an inactive line (ground potential line) 301 of an AC power supply (commercial power supply power supply) AC,
The other electrode n2 is connected to a live line (non-ground side potential line) 302 of the AC power supply AC. One electrode of the plug (connector for power intake) 51 is connected to the line L1, and the other electrode is connected to the line L2. Line L1,
A DC power supply circuit 54 for generating a predetermined DC voltage is connected to L2 via a transformer 53.

When the main switch 52 is turned on by inserting the plug 51 into the outlet 300, the lines L1, L
An AC voltage is applied between the two. Then, the delay circuit 55
Turns off the contact of the relay 56 for a certain period of time. Meanwhile, the ground line detection circuit 58 detects whether the line L2 is connected to the non-active line 301 side of the AC power supply AC.

[0007] For example, when a line L2 is connected to the hot 302 side, current flows I ₀ to the line L2 from the capacitance C which exists between the ground G and Todan tool body via a line L4 and a resistor R . As a result, the ground line detection circuit 58 connects the contact of the relay 57 to the terminal b. Conversely, line L2 when connected to Hikatsusen 301 side, the line L4, the resistor R and the line L2 current I ₀ does not flow. Thereby, the ground line detection circuit 58 connects the contact of the relay 57 to the terminal a. Thereafter, the delay circuit 55 turns on the contact of the relay 56.
Thus, the line L4 is always connected to the inactive line 301 side of the AC power supply AC.

The negative potential generating circuit 59 has a positive potential side terminal N11 connected to the line L4 and a negative potential side terminal N12 connected to one end of the heater 70 via the protection resistor 60. This negative potential generating circuit 59 is connected to a positive potential side terminal N11.
Generates a high-level negative potential (negative potential) from the negative potential side terminal N12 in a state in which the negative potential is held at the ground potential. To the node N10). Control circuit 61
Turns on the thyristor 62 in the negative half cycle of the AC voltage from the AC power supply AC and turns off the thyristor 62 in the positive half cycle of the AC voltage.

FIG. 6A shows the AC voltage of the AC power supply AC, FIG. 6B shows the potential at one end of the heater 70, and FIG.
Indicates a current flowing through the heater 70. As shown in FIG. 6, a negative potential is applied to the heater 70 in the positive half cycle of the AC voltage, and the heater 7 is supplied in the negative half cycle of the AC voltage.
Current is supplied to zero. Thereby, the negative potential treatment function is exhibited in the positive half cycle of the AC voltage, and the heater is heated in the negative half cycle of the AC voltage.

[0010]

As shown in FIG. 6C, current flows through the heater 70 only in the negative half cycle of the AC voltage. Therefore, the current flowing through the heater 70 is intermittent. The intermittent current will generate electromagnetic waves. Such a warming device is used in contact with the human body for a long time during the winter season, and electromagnetic waves may have some influence on the human body. Heating equipment is also used in various places, and electromagnetic waves may affect the surrounding environment more or less.

For example, when a treatment is performed using a treatment device composed of precise electronic equipment while heating a human body in a treatment room of a hospital, electromagnetic waves generated by intermittent currents cause electromagnetic induction-induced obstacles in the treatment device. May give.

An object of the present invention is to provide an inexpensive warming device having a negative potential treatment function and suppressed generation of electromagnetic waves.

[0013]

Means for Solving the Problems and Effects of the Invention

(1) First invention The warming implement according to the first invention is such that at least one of the first and second conductors is formed by a heating element, and the second conductor is provided along the first conductor. The first and second conductors are integrally surrounded by a shield conductor, one ends of the first and second conductors are electrically connected to each other, and current is supplied from the other end of the first conductor by the current supply means. The current is supplied to the other end of the second conductive wire, and a negative potential is applied to the shield conductor by a negative potential generating circuit.

[0014] In the warming tool according to the first invention, the first component is the first component.
Since one end of the second conductor is electrically connected to the other end of the second conductor, when current is supplied from the other end of the first conductor to the other end of the second conductor by the current supply means, the first conductor is connected to the first conductor. Currents flow in opposite directions to the second conductor and the second conductor. Therefore, the magnetic field generated by the current flowing through the first conductor and the magnetic field generated by the current flowing through the second conductor are opposite to each other. Therefore, the magnetic field due to the current flowing through the first conductor and the magnetic field due to the current flowing through the second conductor cancel each other, and almost no magnetic field is generated around the first and second conductors.

Further, the first and second conductive wires are integrally surrounded by a shield conductor, and a negative potential is applied to the shield conductor. Therefore, the electric field inside the shield conductor is shielded by the shield conductor, and no electric field is generated outside the shield conductor.

As described above, the magnetic field and the electric field are hardly formed around the first and second conductive wires, and almost no electromagnetic waves are generated. Also, since a negative potential is applied to the shield conductor, the shield conductor exhibits a negative potential treatment function.

Therefore, an inexpensive warming device having a negative potential treatment function and suppressed generation of electromagnetic waves can be obtained. (2) Second invention A warming implement according to a second invention is the warming implement according to the first invention, wherein the first conductor, the second conductor, and the shield conductor are formed coaxially. . Thereby, generation of a magnetic field and an electric field is effectively suppressed. In addition, since the first conductor, the second conductor, and the shield conductor are integrated into one wire, handling becomes easier.

(3) Third invention A heating device according to a third invention is the heating device according to the first or second invention, wherein the current supply means is an AC power supply, and The rectifier further includes a rectifier for flowing a current through the first and second conductors only during the negative half cycle. Thereby, the potentials of the first and second conductors also become negative potentials. Therefore, the effect of the negative potential treatment function is improved.

[0019]

FIG. 1 is a circuit diagram of a heater according to an embodiment of the present invention. This warming tool is, for example, an electric blanket, an electric carpet, or a foot warmer. The heating device of FIG. 1 includes a controller 100 and a heating device main body 200.

A heater 10 and a temperature sensor 12 are built in the main body 200 of the heater. The heater 10 has a first
, A second heating conductor 10b and a shield conductor 10c. On the other hand, the temperature sensor 12 includes a heat-sensitive wire 12a and a shield conductor 12b. In this embodiment, the shield conductor 10c of the heater 10 and the shield conductor 12b of the temperature sensor 12 are used as the electric floor 40 for applying a negative potential.

The controller section 100 mainly includes diodes 1 and 2, a negative potential generating circuit (negative potential generating circuit) 3, a temperature control circuit 4, a transformer 5, a DC power supply circuit 6, a microcomputer 7, a main switch 9, and a thyristor 13. And a switching element 14.

The line L1 is connected to one electrode of the plug 8, and the line L2 is connected to the plug 8 via the main switch 9.
Is connected to the other electrode. The anode of diode 1 is connected to node N1, and the cathode is connected to line L1. The anode of diode 2 is connected to node N1, and the cathode is connected to line L2. These diodes 1 and 2 constitute a positive potential side terminal connection circuit 30.

The primary winding 5a of the transformer 5 has lines L1 and L
It is connected between the two. One power supply terminal 3a of the negative potential generation circuit 3 is connected to one end of one secondary winding 5b of the transformer 5, and the other power supply terminal 3b is connected to the other end of the secondary winding 5b via the switching element 14. It is connected. The positive potential side terminal 31 of the negative potential generating circuit 3 is connected to the node N1, and the negative potential side terminal 32 is connected to the shield conductor 10c of the heater 10 and the shield conductor 12b of the temperature sensor 12. The negative potential generating circuit 3 is composed of, for example, a two-stage two-stage overlapping quadruple voltage circuit.
A negative potential of 00V is output.

A DC power supply circuit 6 is connected to the other secondary winding 5c of the transformer 5. Microcomputer 7
Is a control signal S for controlling the generation timing and generation period of the negative potential to the switching element 14 according to a preset control program and a negative potential generation pattern.
C and a control signal VC for switching the level of the negative potential to the negative potential generating circuit 3. A DC voltage for operating the microcomputer 7 is provided by a DC power supply circuit 6.

A diode 1 is connected between one end of the first heating conductor 10a of the heater 10 and one end of the second heating conductor 10b.
1 is connected. The other end of the first heating conductor 10a is connected to the line L1, and the other end of the second heating conductor 10b is connected to the line L2 via the thyristor 13. Both ends of the heat-sensitive wire 12 a of the temperature sensor 12 are connected to the temperature control circuit 4. The temperature control circuit 4 controls on / off of the thyristor 13 based on the value of the current flowing through the heat-sensitive wire 12a.

One electrode of the outlet 300 is an inactive line (ground potential line) of an AC power supply (commercial power supply power supply) AC.
The other electrode is connected to a live line (non-ground side potential line) 302 of the AC power supply AC.

When the plug 8 is inserted into the outlet 300 and the main switch 9 is turned on, the first heating conductor 10a, the diode 11, the second
A current flows through the line L2 via the heating conductor 10b and the thyristor 13. Thereby, the first and second heat generating conductors 10a and 10b of the heater 10 generate heat. At this time, the temperature control circuit 4 controls the temperature by turning on and off the thyristor 13 based on the value of the current flowing through the heat-sensitive wire 12a of the temperature sensor 12.

On the other hand, the potential of the node N1 is
2 keeps it at ground potential or negative potential. When the microcomputer 7 turns on the switching element 14 by the control signal SC, a negative potential is generated from the negative potential side terminal 32 of the negative potential generating circuit 3. This negative potential is applied to the shield conductor 10c of the heater 10 and the shield conductor 12b of the temperature sensor 12, which serve as the electric floor 40. Thereby, a negative potential treatment function is exhibited. The level of the negative potential generated by the negative potential generating circuit 3 is switched by a control signal VC of the microcomputer 7.

FIG. 2A is a waveform diagram of the AC voltage of the AC power supply AC, and FIG. 2B is a waveform diagram of the potential of the electric floor 40. As shown in FIG. 2A, the AC voltage of the AC power supply AC changes sinusoidally between + E and -E. As shown in FIG. 2B, the potential of the electric bed 40 becomes -Vn in a positive half cycle of the AC voltage, and becomes -Vn in a negative half cycle.
-E.

FIG. 3 is a schematic diagram showing the structure of the heater 10 shown in FIG. In FIG. 3, a first heating conductor 10a made of a conductive foil or an alignment wire is spirally wound around a core 21 made of an insulator, and the core 21 and the first heating conductor 10a are formed.
Of the heating conductor 10a is covered with an insulating layer 22 made of resin. A second heating conductor 10b made of a conductive foil or an alignment wire is spirally wound around the insulating layer 22, and the surfaces of the insulating layer 22 and the second heating conductor 10b are formed by an insulating layer 23 made of resin. Coated. Further, the shield conductor 10c is spirally wound around the insulating layer 23, and the surfaces of the insulating layer 23 and the shield conductor 10c are covered with an insulating layer 24 made of resin. A heat sealing layer 25 is formed around the insulating layer 24.

Next, the operation of the heater 10 in the warming tool of this embodiment will be described with reference to FIG. The first heating conductor 10a and the second heating conductors 10b as shown in FIG. 4
Are electrically connected to each other. When the current I is supplied from the end of the first heating conductor 10a, the currents I flow in the first heating conductor 10a and the second heating conductor 10b in opposite directions.

As a result, a magnetic field + H is generated around the first heating conductor 10a, and a magnetic field -H is generated around the second heating conductor 10b. The directions of the magnetic field + H and the magnetic field -H are opposite to each other. Therefore, the magnetic field + H and the magnetic field −H cancel each other, and almost no magnetic field is generated around the heater 10.

The first heating conductor 10a and the second heating conductor 10b are integrally covered by a shield conductor 10c, and the shield conductor 10c is maintained at a negative potential -Vn. Therefore, the electric field in the heater 10 is shielded by the shield conductor 10c, and no electric field is generated outside the heater 10.

As described above, a magnetic field and an electric field are hardly formed outside the heater 10, and an electromagnetic wave is hardly generated. Further, since the negative potential -Vn is applied to the shield conductor 10c, a negative potential treatment function is exhibited. further,
The first and second heat generating conductors 10
Since it is electrically separated from the a and 10b, the negative potential treatment can be performed at an arbitrary timing independently of the heater heating.

Further, in the heater 10 of this embodiment,
Since the first heating conductor 10a, the second heating conductor 10b and the shield conductor 10c are formed coaxially, handling is easy.

As described above, in the warming implement of the present embodiment, the negative potential treatment function is realized with almost no electromagnetic waves generated from the heater 10. In the present embodiment, the first
Although the heat-generating conductor 10a and the second heat-generating conductor 10b are arranged coaxially, the first heat-generating conductor 10a and the second heat-generating conductor 10b may be arranged in parallel with each other.

In the above embodiment, the first and second heat conductors 10a and 10b are used as the first and second conductors, but one of the first and second conductors is formed by the heat conductor. The other may be formed by a simple conductor.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a warming tool according to an embodiment of the present invention.

FIG. 2 is a waveform diagram of a power supply voltage of an AC power supply and a potential of an electric floor.

FIG. 3 is a schematic view showing a structure of a heater used in the warming device of FIG.

FIG. 4 is a diagram for explaining the operation of the heater of FIG. 3;

FIG. 5 is a circuit diagram showing an example of a conventional warming tool.

FIG. 6 is a waveform diagram of an AC voltage of an AC power supply, a potential at one end of a heater, and a current flowing through the heater in a conventional warming device.

[Explanation of symbols]

 Reference Signs List 3 negative potential generating circuit 10 heater 10a first heating conductor 10b second heating conductor 10c shielded conductor 12 temperature sensor 12a heat-sensitive wire 12b shielded conductor 40 electric floor AC AC power supply

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H05B 1/00-3/82 A61N 1/10

Claims (4)

(57) [Claims] At least one of a first and a second conductor is formed by a heating element, and the second conductor is provided along the first conductor, and the periphery of the first and second conductors is provided. Are integrally surrounded by a shield conductor, and one ends of the first and second conductors are electrically connected to each other;
Current by the supply means to supply current to the other end of the second conductor from the other end of said first conductor, and Todan device, which comprises applying a negative potential to the shield conductor. 2. The shield conductor according to claim 2, wherein
The method according to claim 1, wherein a negative potential is applied to
Warmer. Wherein said first conductor, Todan device according to claim 1 or 2, wherein the second conductor and the shield conductor is characterized in that it is formed coaxially. 4. The current supply means is an AC power supply, and further comprises rectification means for supplying a current to the first and second conductors only during a negative half cycle of the AC voltage of the AC power supply. The warming tool according to claim 1 , 2 or 3, wherein: