JP2002374661A - Portable generator and portable electronic apparatus comprising it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable generator which can convert the kinetic energy of vibration or oscillation during carriage into electric energy efficiently without requiring a troublesome operation, and a portable electronic apparatus comprising it. SOLUTION: The portable generator comprises a rechargeable battery, a tubular coil, a rod-like permanent magnet inserted into the core part of the coil and held movably in the axial direction with a spring, and a rectifier wherein an AC voltage induced in the coil by axial vibration of the permanent magnet based on vibration or oscillation during carriage is rectified by the rectifier to produce a DC voltage for recharging the battery. Resonance frequency in the axial direction of a permanent magnet system comprising the permanent magnet and the spring is substantially matches the average period of a main vibration source generating an axial vibration during carriage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable power generator which uses vibration or swing during a portable operation as an energy source to obtain electric energy through electromagnetic induction, and more particularly to a portable telephone having a built-in rechargeable battery. , A portable generator suitable for a portable electronic device such as a portable radio, and a portable electronic device using the same.

[0002]

2. Description of the Related Art In recent years, the spread of portable electronic devices surrounding the living environment has been remarkable. Among them, the penetration rate of mobile phones and PHS has reached 64.9% (1999 National Consumption Survey). Is charged with a rechargeable battery, so that frequent charging is required, and there is a high possibility that the battery will run out due to forgetting to charge. That is, the operation time after charging the battery is, for example, 1 to 3 hours for a talking time and 50 to 300 hours for a continuous standby time in a mobile phone, and charging is required almost every day. In portable computer equipment, the power consumption of the backlight of the liquid crystal display and the CPU is large, and the frequency of charging is high.

Hitherto, as a portable generator for a portable electronic device or a portable electronic device having a built-in generator,
Although various conventional techniques have been disclosed, a portable generator that can be suitably used for a mobile phone or the like has not been put to practical use yet.
For example, a hand-held rotary type portable generator (JP-A-10-210673)
(A manual type portable charging device) is disclosed, but this conventional technique has problems such as troublesome manual rotation operation and an increase in size of equipment.

[0004] In addition, portable electronic devices are conventionally provided with:
A technology in which an actuator that generates vibration during operation is also used as a generator by swinging when not in operation (Japanese Patent Application Laid-Open No. H10-313933, a power generation device for a portable electronic device and a portable electronic device including the power generation device) has been developed. Although disclosed, this conventional technique inherently makes it impossible to use a mechanism having a different purpose, and it is difficult to obtain the power required for a portable electronic device.

Furthermore, in order to provide a portable electronic device which operates automatically with electric power generated by using vibration and swinging during carrying as an energy source, a rechargeable battery is built in and a cylindrical battery is provided. A portable electronic device having a generator including a coil and a rod-shaped permanent magnet inserted into a shaft core portion of the coil and held movably in the axial direction (Japanese Patent Laid-Open No. 2000-2000)
-308327 portable electronic device), but this prior art does not disclose a means for efficiently converting kinetic energy of vibration or swinging into electric energy during carrying.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and does not require a troublesome operation.
It is an object of the present invention to provide a portable generator capable of efficiently converting kinetic energy of vibration or swing during carrying to electric energy, and a portable electronic device using the same.

[0007]

In order to achieve the above object, a portable generator according to the present invention comprises a rechargeable battery, a cylindrical coil, and a coil inserted into a core portion of the coil and extending in an axial direction. The rectifier includes a rod-shaped permanent magnet movably held by a spring, and a rectifier, and rectifies an AC voltage generated in the coil by the axial vibration of the permanent magnet based on vibration and swinging during carrying with the rectifier. In a portable generator that charges a battery with a rectified DC voltage, the axial resonance frequency of a permanent magnet system constituted by the permanent magnet and the spring is substantially reduced to a main frequency that causes axial vibration when the device is carried. This is in accordance with the average period of the vibration source.

[0008] The portable generator of the present invention further comprises means for adjusting the axial resonance frequency of the permanent magnet system, and further reduces frictional force caused by contact between the permanent magnet and the coil. The lubrication treatment was performed to reduce it.

The coil is divided into two parts in the axial direction, a rectifier is provided for each of the two divided coils, and an AC voltage generated in the two divided coils is independently converted into a DC voltage and then rectified. One DC voltage is connected in series, and the battery is charged with the combined DC voltage.

A portable electronic device according to the present invention is a portable electronic device having a built-in rechargeable battery and operating by supplying power from the battery, wherein the battery of the portable electronic device is replaced with the portable electronic device according to the present invention. It is a battery for the generator.

The portable electronic device of the present invention is also a portable electronic device that incorporates a rechargeable battery and operates by supplying power from the battery, wherein the battery of the portable electronic device is replaced with the portable electronic device of the present invention. It is a battery that can be replaced with the battery of the type generator.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the relationship between the resonance frequency and the so-called natural frequency will be described.

The natural frequency of a vibration system composed of a weight and a spring can be obtained from the mass of the weight and the spring constant of the spring when there is no damping force (such as frictional force). There is a property that the natural frequency is reduced according to the magnitude of the damping force. In order to distinguish them, the natural frequency not including the damping force is converted to the non-damped natural frequency (or the non-damped natural frequency). The natural frequency including the damping force may be referred to as a damped natural frequency.

The resonance frequency is defined as the input frequency at which the output amplitude becomes maximum when an input having a constant amplitude is applied. When no damping force is present, the non-damped natural frequency and the damped natural frequency are used. The number and the resonance frequency match. On the other hand, when a damping force is present, the three do not match, and the damped natural frequency is lower than the non-damped natural frequency. The resonant frequency may be higher or lower than the non-damped natural frequency, depending on how the damping force acts.

In the portable generator according to the present invention, it is desirable to reduce the influence of the damping force to a negligible level by a lubrication treatment or the like for reducing the frictional force due to the contact between the permanent magnet and the coil. The number substantially corresponds to the natural frequency. In addition, this configuration facilitates the design or adjustment of the generator. That is, the portable generator of the present invention is desirably configured so that the maximum generated power can be obtained by adjusting the non-attenuated resonance frequency substantially to the average period of the main vibration source. When the influence is large, it does not exclude a configuration in which the damped natural frequency is generally set to the average period of the main vibration source.

A portable power generator according to the present invention comprises a rechargeable battery, a cylindrical coil, and a rod-shaped permanent magnet inserted into an axial core of the coil and held by a spring so as to be movable in the axial direction. , A rectifier, and a portable generator, which generates a relative axial vibration between the permanent magnet and the coil based on vibrations and swings at the time of carrying, as is well known in the art. Thus, an AC voltage can be generated in the coil, the AC voltage can be rectified by a rectifier, and the battery can be charged with the rectified DC voltage.

In the portable generator having such a configuration, the portable generator according to the present invention has an axial resonance frequency substantially equal to the axial resonance frequency of the permanent magnet system composed of the permanent magnet and the spring when the portable generator is carried. The resonance is used as a means for efficiently converting the kinetic energy of vibration or swaying during carrying to electric energy in accordance with the average cycle of the main vibration source to be tightened. The main vibration source is usually walking, and the resonance frequency in the axial direction of the permanent magnet system is adjusted to the average period of the walking time of the wearer, and the efficiency generated by using the resonance generated in the permanent magnet system when walking is used. Energy conversion can be performed well. In addition,
The present invention does not exclude the case where a vibration source, such as a specific worker, is obtained that is longer than walking, so that the average period of the vibration source is adjusted. In addition, for example, when the battery charge is insufficient only by the portable walking, it does not exclude that the battery is charged by forcibly vibrating, for example, shaking with a hand.

Next, an embodiment of a portable generator provided with means for adjusting the axial resonance frequency of the permanent magnet system will be described. The average period of vibration and swing when carrying is changed depending on the situation at the time of carrying or the person carrying,
For example, it is said that the average period when a person walks is about 1.9 Hz, but it naturally depends on the person. Therefore, in order to effectively use resonance, for example, a screw mechanism capable of adjusting the effective length of an unequal-pitch spring (or a non-linear spring) is provided. It is desirable to provide a means for adjusting The resonance frequency adjusting means also enables the wearer to adjust the resonance frequency according to the situation when carrying, and the present invention can be implemented more effectively.

Next, an embodiment of a portable generator provided with a lubricating treatment for reducing a frictional force due to contact between the permanent magnet and the coil will be described. The portable generator of the present invention is one of the important design items to reduce the gap between the permanent magnet and the coil in order to increase the generated power with a compact structure. Since the vibration or swing of the magnet is used as an energy source, the spring for supporting the permanent magnet movably in the axial direction cannot have high rigidity. As a result, contact between the permanent magnet and the coil cannot be avoided.
Therefore, it is desirable to perform a lubrication treatment for reducing the frictional force due to the contact between the permanent magnet and the coil, such as a smoothing treatment of the outer peripheral surface of the permanent magnet or a lubrication treatment between the permanent magnet and the coil with lubricating oil.

Next, an embodiment of a portable generator in which the coil is divided into two parts in the axial direction will be described. In the portable generator of the present invention, when the permanent magnet passes near the equilibrium position, the polarity of the generated voltage in one axial direction and the generated voltage in the other axial direction are opposite, but the coil is divided in the axial direction. If the coils are wound without being wound, they cancel each other, so that the entire generated voltage decreases. On the other hand, after the coil is divided into two parts in the axial direction near the equilibrium position of the permanent magnet, a rectifier is provided for each of the two divided coils, and an AC voltage generated in the two divided coils is independently converted into a DC voltage. By combining two rectified DC voltages in series and charging the battery with the combined DC voltage, even when the permanent magnet passes near the equilibrium position, the generated power can be efficiently converted without canceling out the generated voltage. it can.

A portable electronic device according to the present invention is a portable electronic device which has a built-in rechargeable battery and operates by supplying power from the battery.
The battery of the portable electronic device is the battery of the portable generator of the present invention. That is, a portable battery that shares a rechargeable battery, a portable electronic device incorporating the portable generator of the present invention, or a portable generator excluding the battery is housed in an independent case, and the portable electronic device is The present invention can be embodied in the form of a portable electronic device or the like in which a portable generator excluding a battery housed in an independent case is connected to a power supply line or the like.

In the first embodiment, the power supply line to the battery is shortened to reduce the power transmission loss and to reduce the trouble caused by the length of the power supply line. This is an embodiment suitable for an electronic device.

In the second embodiment, the battery of the portable electronic device is replaced with a battery of the portable generator of the present invention. That is, the portable generator of the present invention including a battery is an independent device that is housed in a case, and this battery is replaceable with a battery of a portable electronic device.

As mentioned above, the portable generator of the present invention
The kinetic energy of vibration or swing during the portable operation is converted into electric energy and stored, but the obtained kinetic energy is significantly different depending on the place where the portable generator is installed during the portable operation. For example, when walking is considered, the kinetic energy applied to the portable generator is significantly different between the chest for accommodating the mobile phone and the lower leg or lower leg.

In the second embodiment, the power transmission loss to the battery is minimized, the trouble caused by the length of the power supply line is eliminated, and the device can be freely attached to a portion where the kinetic energy obtained during carrying is large. For example, a portable generator is attached to the lower leg of the pants, or a pocket provided in the lower limb, and the battery is stored by the large vibration energy obtained here, and the stored battery is used as the battery of the portable electronic device. Exchange and use. The second embodiment is suitable for a portable electronic device that consumes a large amount of power.

According to the present invention as described above, according to the present invention, a complicated operation such as a manual rotation operation is not required, and the resonance frequency in the axial direction of the permanent magnet system can be reduced by the average of the main vibration sources in the portable mode. By adjusting to the cycle, it is possible to provide a portable generator that can efficiently convert kinetic energy of vibrations and swings at the time of carrying to electric energy using resonance and a portable electronic device using the same. The portable power generator of the present invention can be effectively used as an emergency power supply for portable electronic devices such as mobile phones in an emergency or disaster.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

First, a prototype of the portable generator of the present invention will be described. The study with the prototype machine has shown two types of permanent magnets (long and short length) and two types of springs (large spring constant,
In this example, a combination of a short permanent magnet and a spring having a small spring constant, which is less affected by frictional force, will be described.

FIG. 1 is a schematic configuration diagram of a power generation unit excluding a battery and a rectifier of a prototype, and FIG. 2 is a photograph thereof. The coil is a polycarbonate cylinder (outer diameter 24mm,
Enamel wire is wound 100 times five times (total number of windings 500, internal resistance 8.8Ω) on an inner diameter of 20mm and length of 130mm.
m, inner diameter 24 mm, length 30 mm), and the permanent magnet is NEOMAX-44H manufactured by Sumitomo Special Metals Co., Ltd.
It has a length of 22 mm and a mass of 44 g). The permanent magnet is inserted into the core of the coil, and can be moved in the axial direction via an acrylic magnetization stopper (18 mm in outer diameter, 10 mm in inner diameter, and 5 mm in thickness).
5mm, spring outer diameter 18mm, free height 110mm, effective winding number 18, spring constant 5.9N / m). An aluminum cover (outer diameter 28 mm, inner diameter) is placed above and below the polycarbonate cylinder.
24mm, 3.5mm deep). The non-damped natural frequency of this permanent magnet system is 1.9 Hz, and the difference between the resonance frequency and the non-damped natural frequency is about 0.8%. That is,
In the embodiment, it can be considered that the resonance frequency and the non-damped natural frequency are substantially the same.

The total number of turns of the coil is 500
A simulation was performed, and the commercially available PH used in this example was used.
This is determined as a condition under which a sufficient power generation voltage can be obtained to charge the battery (lithium-ion storage battery 3.6V-470mAh) of S (KENWOOD XITISD-P47 (L)). In addition,
The rectifier is a known voltage doubler circuit (electronic circuit, Ohmsha, 19
92), using the generated AC voltage as input,
The battery is charged by converting it to double rectified voltage (4V). The spring is made of stainless steel which is hardly magnetized, and the magnetization of the spring is prevented by interposing a magnetization stopper. In this embodiment, only the lower spring is used because it is sufficient for measuring the basic performance. However, in an actual machine, it is desirable to provide upper and lower springs in order to improve stability and the like.

Next, the results of a walking experiment will be described. The subjects were two people (A: Height 178cm, Otsu: Height 174cm).
The power generation unit was attached to the waist belt and was walked. The walking cycle of both subjects was 1.9 Hz, and the generated AC voltage was measured with an oscilloscope.

FIG. 3 shows an actual measurement example of the generated voltage in the walking experiment, and FIG. 4 shows an actual measurement example of the generated power in the walking experiment.
As shown in Fig. 3, the generated voltage has almost achieved the designed power generation voltage of 2V. The power generated by each subject can be calculated from Fig. 4. Maximum 110mW, average 13mW.

At present, for example, the average power consumption of a mobile phone is about several tens of mW. However, this embodiment further reduces the power generation capacity by devising the winding method of the coil and attaching it to a portion having a large kinetic energy. Can be improved,
With the continuous development of low power consumption type ICs, it is expected that the power consumption of portable electronic devices will also be reduced, and the portable generator of the present invention is of a sufficiently practical level.

Next, as a second embodiment, a specific effect of using resonance will be described with reference to a simulation calculation example. The generator specifications used for the calculation are those of Example 1. The damping coefficient required for the simulation calculation is based on a calculation model created on the assumption that the frictional force is proportional to the relative speed between the permanent magnet and the cylinder. It was obtained by identifying the actual natural attenuation and using 0.
09 N · s / m.

Table 1 shows the result of the simulation calculation. The case where the power generation amount at the resonance point (1.9 Hz) at which the axial resonance frequency of the permanent magnet system coincides with the external excitation frequency is used as a reference. , The power generation decreases as the excitation frequency moves away from the resonance point. For example, at the excitation frequency of -10%, the power generation
It decreases to 64% and to 72% at the excitation frequency + 10%, respectively. That is, this result indicates that it is extremely effective to use resonance in a portable power generator that generates power by vibrations caused by vibrations and vibrations when carrying.

[0036]

[Table 1]

Next, as a third embodiment, a description will be given of a portable generator in which the winding of the coil is devised and the coil is divided into two parts in the axial direction. FIG. 5 is a conceptual comparison diagram conceptually showing a conventional coil winding method in which the coil is not divided and a new coil winding method in which the coil is divided into two in the axial direction. The lower part shows the improved coil winding method and its operation, and the lower part shows the improved coil winding method and its operation. Both figures are in three views, the left figure shows the permanent magnet stopped at the equilibrium position, the middle figure shows the permanent magnet approaching the coil from below, and the right figure shows the permanent magnet balanced. This shows a state where the vehicle is passing near the position.

As shown in the middle diagram, when the N pole and the S pole are not in the coil position at the same time, the polarity of the generated voltage generated in the coil is all the same, and the conventional winding and the new winding are different. There is no difference between them, but on the other hand, as shown in the right figure, a large difference occurs when the N pole and the S pole are simultaneously in the coil position. That is, in this state, as shown in the right diagram of FIG.
The polarity of the other generated voltage in the axial direction is opposite, but in the case of the conventional winding method, the coils are canceled in the axial direction near the equilibrium position of the permanent magnet, while the overall generated voltage is reduced because they cancel each other out. In the case of the new winding method, which is divided into two and rectified independently and then connected in series, the energy can be efficiently converted without canceling out the generated voltage even when the permanent magnet passes near the equilibrium position. .

The present embodiment has a drawback that two rectifiers (not shown) are required. However, in order to realize a portable generator capable of efficiently converting energy into energy and a portable electronic device using the same, the present invention is not limited thereto. It is valid.

According to the embodiment described in detail above, the axial resonance frequency of the permanent magnet system is adjusted to the average period of the main vibration source when the portable device is carried, without requiring a troublesome operation such as a manual rotation operation. Accordingly, it is possible to provide a portable generator capable of efficiently converting the kinetic energy of vibration or swing during carrying using resonance to electric energy, and a portable electronic device using the same. Further, by adopting an improved new coil winding method, energy conversion can be performed more efficiently.

While the embodiments of the present invention have been described above, it is to be understood that various changes may be made in form and detail without departing from the spirit and scope of the invention as defined in the appended claims. it is obvious.

For example, in the above-described embodiment, the description has been made mainly on the prototype of the portable generator of the present invention. However, this prototype is for measuring the basic performance, and is shown in the embodiment. The detailed structure, dimensions, materials and the like do not particularly limit the present invention.

[0043]

The present invention relates to a portable power generator that uses vibration and oscillation during carrying as an energy source and obtains electric energy through electromagnetic induction. Lubrication to reduce the frictional force caused by the contact between the permanent magnet and the coil, and to make the coil two-way in the axial direction. Provided is a portable power generator that can efficiently convert kinetic energy of vibration or swing during carrying to electric energy without requiring cumbersome operation such as manual rotation operation, and a portable electronic device using the same. There are effects that can be.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a power generation unit excluding a battery and a rectifier of a portable generator prototype of the present invention.

FIG. 2 is an external view photograph of a power generation unit of a portable generator prototype of the present invention, excluding a battery and a rectifier.

FIG. 3 is a diagram illustrating an example of a voltage generated by a walking experiment using a prototype.

FIG. 4 is a diagram illustrating an example of power generated by a walking experiment using a prototype machine.

FIG. 5 shows a conventional method of winding a coil without dividing the coil,
FIG. 5 is a conceptual comparison diagram conceptually showing a new coil winding method in which a coil is divided into two parts in an axial direction.

Continued on the front page (72) Inventor Atsushi Nakayama 1-1-1 Minamikogushi, Ube City, Yamaguchi Prefecture Yamaguchi University Graduate School of Medicine F-term (Reference) 5G003 AA07 5H030 AS11 BB01 BB10 DD04

Claims (6)

[Claims] 1. A rechargeable battery comprising: a rechargeable battery; a cylindrical coil; a rod-shaped permanent magnet inserted into a shaft core of the coil and held by a spring so as to be movable in an axial direction; and a rectifier. A portable generator that rectifies an AC voltage generated in the coil by the axial vibration of the permanent magnet based on vibration or swing during carrying with the rectifier and charges the battery with the rectified DC voltage. A mobile phone characterized in that an axial resonance frequency of a permanent magnet system constituted by the permanent magnet and the spring is generally set to an average period of a main vibration source that generates the axial vibration when the mobile phone is carried. Type generator. 2. The portable generator according to claim 1, further comprising means for adjusting an axial resonance frequency of the permanent magnet system. 3. The portable generator according to claim 1, wherein a lubricating treatment is performed to reduce a frictional force caused by contact between the permanent magnet and the coil. 4. A configuration in which the coil is divided into two in the axial direction, a rectifier is provided in each of the divided coils, and an AC voltage generated in the divided coil is independently converted into a DC voltage, and then the rectified voltage is changed. Two DC voltages are connected in series,
The portable generator according to any one of claims 1 to 3, wherein the battery is charged with the combined DC voltage. 5. A portable electronic device having a built-in rechargeable battery and operated by supplying power from the battery, wherein the battery is a portable power generation device according to any one of claims 1 to 4. A portable electronic device characterized by being a battery of a portable electronic device. 6. A portable electronic device having a built-in rechargeable battery and operated by supplying power from the battery, wherein the battery is a portable power generation device according to any one of claims 1 to 4. A portable electronic device characterized by being a battery that can be replaced with a battery of the portable device.