JP2001340472A - Home electric magnetic therapy unit - Google Patents

Abstract

(57) [Problem] To provide a safe electro-magnetic therapy device for home use. An air-core coil (ring) has a magnetism generating section,
An intermittent sine wave generator 30 for intermittently emitting a 50 Hz or 60 Hz sine wave, and a power supply unit 40 for amplifying the same.
And an output setting unit 20 that writes the intermittent time and the set level in the storage device 10 and sequentially reads out the intermittent sine wave generating unit during operation to set the intermittent sine wave generating unit. Not intermittent sinusoidal magnetism,
Generates intermittent sinusoidal magnetism that reproduces natural rhythms that are comfortable for the human body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home electro-magnetic therapy device having a high therapeutic effect and safe.

[0002]

2. Description of the Related Art There has been invented a magnetic therapy device having a magnetic generator of an air-core coil, frequency modulation (FIG. 2) by a sweep generator (FIG. 1), and a power supply for amplification (for example, Japanese Patent No. 2119664). ). Since the air-core coil has a ring shape, the treatment can be performed efficiently due to the features such as the ability to pass through the limbs, the application of magnetism to a wide range, and the lightness and ease of handling of the magnetism generating part.

[0003]

[Problems to be Solved by the Invention] The following two specifications are required by laws and regulations as a home electro-magnetic therapy device. (A) The maximum magnetic flux density is 35 mT when a voltage equal to the rated frequency and equal to the rated voltage is applied and the surface magnetic flux density of the portion in contact with the affected part is measured using a magnetic flux density meter.
It must be no less than 180 mT. (B) The generated magnetic field must have a substantially sinusoidal waveform and a frequency of 50 Hz or 60 Hz.

[0004] If these specifications are to be satisfied by the conventional technique, a problem of overheating of the magnetism generating portion occurs where the maximum magnetic flux density is obtained. The reason is as follows.

[0005] The air-core coil has a smaller inductance than the iron core coil, and has a relative permeability of as small as about 1, so that the current flowing to obtain the maximum magnetic flux density required by laws and regulations is very small (tens of amperes). Become larger. The air-core coil that can pass through the limb has a small surface area, so it has a large thermal resistance for heat dissipation, copper loss of the winding of the air-core coil, dielectric loss of the electromagnet, etc. in a short time (several minutes) The temperature rises to a risk of burns to the human body. Therefore, in order to apply the technology to a home electro-magnetic therapy device, a problem of overheating which cannot be solved by this technology occurs.

[0006] Further, depending on the operating voltage of the power supply unit, there is a problem that a danger such as an electric shock occurs when the equipment breaks down, and the sweep generator automatically and continuously deviates the frequency in a certain frequency band. The problem is mechanical, monotonous and uncomfortable.

[0007]

According to a first aspect of the present invention, there is provided a home-use electro-magnetic therapy device, wherein an air-core coil-shaped magnetic generator is provided.
50, an intermittent sine wave generator 3 that generates a sine wave intermittently
0 and a power supply unit 4 for amplifying the sine wave to a required level
0.

According to a second aspect of the present invention, there is provided a home electro-magnetic therapy apparatus according to the first aspect, wherein the power supply section 40 is connected to a safe low voltage (line voltage or ground voltage is 42.4 V or less, and (No-load voltage is 50 V or less).

According to a third aspect of the present invention, there is provided a home electro-magnetic therapy device according to the first or second aspect of the present invention.
In addition, an intermittent time and a set level are written therein, and the output setting unit 20 for sequentially reading out the intermittent sine wave generating unit 30 during operation is provided.

[0010]

Embodiments of the present invention will be described with reference to the drawings. 30
Denotes an intermittent sine wave generator, and 40 denotes a power supply unit, which amplifies a signal received from the intermittent sine wave generator 30 and outputs the amplified signal to the magnetic generator 50. The magnetic generating unit 50 is a magnetic generating unit in which a conductive wire is formed in a hollow coil shape (solenoid shape) to form an electromagnet. For example, an inner diameter D is set so that a therapeutic effect can be enhanced by inserting hands and feet into the hollow portion. It is configured to be approximately 15 cm. When the intermittent sine wave signal is amplified by the power supply unit 40 and an intermittent sine wave current flows, an intermittent sine wave magnetism is generated in proportion to the current. The shape of the magnetic generation unit 50 is determined as appropriate according to the maximum magnetic flux density to be generated, the treatment site, and the treatment target.

Reference numeral 60 denotes a power supply unit which supplies a safe power supply voltage to the power supply unit 40 and stores a safe power supply voltage for control in the storage device 10, the output setting unit 20, and the intermittent sine wave generation unit 30. Supply.

Numeral 40 denotes a power supply unit for supplying electric power to the magnetic generation unit 50, which amplifies the power of the signal output from the intermittent sine wave generation unit 30. 50 Hz from the intermittent sine wave generator 30
Alternatively, a 60 Hz intermittent sine wave signal is input. The capacity may be determined based on the maximum magnetic flux density to be generated. 50Hz or 60Hz intermittent sine wave is stored in the storage device (EEPROM)
The output setting unit 20 outputs a set level and an intermittent time signal in accordance with a signal read from the output unit 10 for each output of the intermittent sine wave generation unit 30 and is sent to the intermittent sine wave generation unit 30. The amplitude of the output intermittent sine wave is suppressed to the set level, and at the same time, the intermittent time until the next sine wave is output is determined. The intermittent sine wave output from the intermittent sine wave generating unit 30 has the intermittent sine wave generating unit 30 predetermining the number of sine wave cycles as the set cycle.

Claim 1 will be described in detail. As shown in FIG. 5, the magnetism generating section 50 manufactured in this embodiment is formed of an insulating synthetic resin, and the inside sides X and Y are each formed in a U-shape having a U-shaped shape of 20 mm each. An air-core coil-shaped electromagnet in which a wire is wound and fixed with an insulating synthetic resin or the like.

The characteristics of the magnetism generating section 50 are as follows: inductance L = 1.8 mH, DC resistance R = 0.35Ω, thermal resistance between ambient temperature and bobbin case θ _ca = 2.5 ° C./W, thermal time constant τ = 53 minutes, current-magnetic flux density constant k _B = 1.5 m
T / A.

In order to obtain the minimum magnetic flux density of B = 35 mT required by laws and regulations in this magnetic generator,

[0016]

(Equation 1)

Must be passed. In the conventional technology, since the current is continuously passed, the temperature T _c ° C of the bobbin case at this time is theoretically defined assuming that the ambient temperature is _Ta ° C and the elapsed time is t minutes.

[0018]

(Equation 2)

When the ambient temperature _Ta is 30 ° C.,
After 5 minutes, the temperature _{Tc of the} bobbin case is 51.4 ° C., 10
It reaches a high temperature of 71 ° C after 30 minutes and 133 ° C after 30 minutes, and the temperature limit of laws and regulations (“Use by human touch and other than metal” as shown in Annex 8 of Appendix 8 of the Electrical Appliance and Material Control Law) 70 ° C. in about 9 minutes and 45 seconds.

As described above, when a current is continuously supplied by the conventional technique, even if only the minimum magnetic flux density of B = 35 mT required by laws and regulations is obtained, the temperature rises to a temperature at which there is a danger of burns to the human body in a short time. It turns out that it becomes overheated.

In this embodiment, as shown in FIG. 3, since a sinusoidal current flows intermittently and intermittently, when a maximum magnetic flux density of B = 70 mT is obtained,

[0022]

(Equation 3)

It is necessary to flow a very large current.
The output frequency f = 60 Hz, since the set period = 1 cycle, the intermittent time was t = 0.25 seconds, the average effective current _{I AV G} is

[0024]

(Equation 4)

And the temperature T of the bobbin case at this time
_c ° C. is given _assuming that the ambient temperature is _Ta ° C. and the elapsed time is t minutes.

[0026]

(Equation 5)

When the ambient temperature _Ta is 30 ° C.,
The temperature _{Tc of the} bobbin case is 57.5 ° C. even after 30 minutes, so that a maximum magnetic flux density of B = 70 mT can be obtained without overheating to a temperature at which there is a risk of burns.

As described above, according to the present invention, a sinusoidal current can be intermittently flown, so that even if a hollow air-core coil-shaped magnetic generator is used, it does not overheat as in the prior art. It is possible to provide a home-use electro-magnetic therapeutic device with high efficiency and high efficiency because of its features such as being able to pass through limbs, applying a magnetic field to a wide range, and being light and easy to handle.

Next, the item of claim 2 will be described in detail. In general, a PWM (pulse width modulation) amplifier circuit shown in FIG. 6 is used as a means for efficiently amplifying power to a coil (inductive) load such as a magnetic generator.

However, this PWM amplifier circuit operates on a DC power supply of about 140 V obtained by full-wave rectifying and smoothing the power supply voltage of AC 100 V, so that an insulating means for electrical safety is increased, and a high withstand voltage component and an insulating device are provided. A power supply or the like is required, which is expensive.

Therefore, the present inventor has paid attention to the characteristics of the magnetic generator 50 having a small impedance.

As described above, the characteristics of the magnetic generator 50 manufactured in this embodiment are as follows: inductance L = 1.8 mH, DC resistance R = 0.35Ω, DC-one magnetic flux density constant k _B = 1.
5 mT / A. Therefore, when obtaining the maximum magnetic flux density of B = 70 mT, it is necessary to flow a very large current of 46.7 Ap at the maximum.

In this embodiment, the frequency of the intermittent sine wave is set to 60H
z, the impedance of the magnetic generator 50
The vector Z can be expressed by the vector Z = R + jωL = 0.35 + j0.216π.
The voltage input required to flow the sine-wave current of Ap is vector V: vector V = vector I · vector Z = 46.7 ·
(0.35 + j0.216π) = 16.345 + j3
1.69 ∴v = 35.7 sin (ωt + 62.7 degrees) V Therefore, it is understood that the power supply voltage of the power supply unit 40 only needs to be 35.7 V or more. Therefore, since the air-core coil-shaped magnetism generating unit 50 has a small impedance, even when a maximum magnetic flux density of B = 70 mT is obtained, it can be operated at a safe ultra-low voltage of 42.4 V DC or less, and safety is improved. It can be enhanced.

The structure of the power supply device 60 is such that a household AC 100 V power supply is connected to the terminals 61 a and 61 b, and the safety insulation transformer 64 is connected via the fuse 62 and the power switch 63.
It is connected to the. The safety isolation transformer 64 (FIG. 4) has an input winding electrically separated from an output winding by double insulation, and outputs AC28V with respect to an AC00V input.

AC2 output from the safety insulation transformer 64
The 8V power supply is full-wave rectified by the full-wave rectifier 65, and becomes a DC power supply of about 39V DC by the smoothing capacitor 66. The DC power of about 39 VDC includes a positive electrode 67a and a negative electrode 6a.
7b, the power supply unit 40 is supplied with a safe ultra-low voltage power supply. In addition, similarly, a power supply for control of safe ultra-low voltage is supplied to the storage device 10, the output setting unit 20, and the intermittent sine wave generation unit 30.

The smoothing capacitor 66 is provided with 46.7 Ap for obtaining a maximum magnetic flux density of B = 70 mT in the magnetic generation unit 50.
The voltage is increased by 35.
The capacity of the capacitor is selected so that the ripple voltage does not exceed 3 V so that the voltage does not drop to 7 V.

In this embodiment, attention is paid to the impedance of the magnetism generating unit 50, and the power supply unit 40 is constructed to operate at a safe low voltage of 42.4 V or less between the line voltages supplied from the power supply device 60. Inexpensive, low-voltage general-purpose components can be used without using expensive high-voltage components, insulated power supplies, photocouplers, and other components. This makes it possible to provide safe and low-cost home electro-magnetic therapy devices. It is.

Next, claim 3 will be described in detail. Simply outputting the intermittent sinusoidal magnetism is monotonous and mechanical, and causes a problem of discomfort. Therefore, in the present embodiment, the storage device 10 and the output setting unit 20 are provided, and the rhythm of the intermittent sine wave magnetism, that is, the intermittent time (tempo) shown in FIG.
And the setting level (strength) can be freely controlled.

The data of the intermittent time and the set level written in the storage device 10 are stored in the storage device 10 by the output setting unit 20 every time the intermittent sine wave generation unit 30 outputs a 50 Hz or 60 Hz sine wave of the set cycle. Is incremented, the data of the next intermittent time and the set level are read out to the output setting unit 20, and sent to the intermittent sine wave generating unit 30, so that the intermittent sine wave output from the intermittent sine wave generating unit 30 is The intermittent time (tempo) and the set level (strength) change every time depending on the data written in the storage device 10.

Therefore, a rhythm such as a natural breeze or a babbling brook, which is considered to be comfortable for the human body, is sampled and stored in the storage device 10 as an intermittent time (tempo) and a set level (strength). The intermittent sine wave magnetism which reproduces a natural rhythm comfortable to the human body without a monotonous mechanical and unpleasant sensation by sequentially reading the intermittent time and the set level and sending it to the intermittent sine wave generator 30. Can be generated, and a comfortable and relaxing home electric treatment device can be provided.

[0041]

According to the present invention, an air-core coil (ring) has a magnetism generating portion,
This is a home electromagnetism treatment device including an intermittent sine wave generation unit that generates a 50 Hz or 60 Hz sine wave intermittently and a power supply unit that amplifies the intermittent sine wave. The current flowing in the air-core coil-shaped magnetism generator causes a very large (several tens of amps) current to flow to produce the required magnetic flux density and waveform, but it is output intermittently. Maintains the maximum magnetic flux density and waveform required by laws and regulations, and can be generated intermittently, so that it can meet the requirements of laws and regulations without overheating, and can pass through limbs, Since the magnetic field can be applied to the magnetic field and the magnetism generating portion is light and easy to handle, it is possible to provide a home-use electric magnetic therapy device with high therapeutic effect efficiently.

By operating the power supply unit at a safe low voltage supplied by the power supply unit, it is possible to provide a home-use electro-magnetic therapy device with high safety and at low cost.

Further, by providing the storage device and the output setting section, intermittent sinusoidal magnetism that reproduces a natural rhythm or the like that is comfortable to the human body is generated instead of intermittent sinusoidal magnetism that is monotonous and mechanically uncomfortable. It is possible to provide a comfortable and relaxing home electrotherapy device.

[Brief description of the drawings]

FIG. 1 is a frequency deviation diagram of a conventional sweep generator.

FIG. 2 is a waveform diagram of a sine wave in FIG.

FIG. 3 is a waveform diagram of a sine wave of the present invention.

FIG. 4 is a diagram showing a configuration of the present invention.

FIG. 5 is a cross-sectional view of a magnetic generation unit according to the present invention.

FIG. 6 is a diagram illustrating a configuration of a general PWM (pulse width modulation) amplifier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Storage device 20 Output setting part 30 Intermittent sine wave generation part 40 Power supply part 50 Magnetic generation part 60 Power supply device 61a, 61b Household power supply (AC100V) input terminal 62 Fuse 63 Power switch 64 Safety isolation transformer 65 Full-wave rectifier 66 Smoothing capacitor 67a DC power supply positive pole 67b DC power supply negative pole

Claims (3)

[Claims] 1. An air-core coil-shaped magnetism generating part (50),
An intermittent sine wave generator for generating a sine wave intermittently (30)
And a power supply unit (4) for amplifying the sine wave to a required level.
0). 2. A home electro-magnetic therapy device according to claim 1, wherein the power supply (40) operates at a safe low voltage. 3. An output setting unit (20) for writing an intermittent time and a set level in a storage device (10), sequentially reading them out during operation, and setting an intermittent sine wave generator (30). The home electro-magnetic therapy device according to claim 1 or 2.