JPS5833676B2 - Denki Energy Denso Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention describes an electromagnetic alternating system that can physically retransmit energy so that a change in voltage or current occurs in one or more coils that generate an alternating magnetic field. The present invention relates to an electrical energy transmission device utilizing a magnetic field.

If the coils of the primary device are well controlled to suit the purpose, any energy receiver, commonly referred to as the secondary device, can be energized with electromagnetic energy depending on the position of the secondary device with respect to the primary device. However, this can be converted into other forms of energy in any way.

Devices for special purposes are already known, such as:

A heat retention device, especially for food, in which a heat accumulator made of ferromagnetic material is placed in a food container in the form of a plate or grid.
Afterward, the contents of the container are transported into an induction furnace and reheated in order to reapply the accumulator heat to the contents.

Other forms of heat generation that utilize so-called eddy current losses, for example, bring the article to be heated or melted into a correspondingly designed induction coil, i.e. in the region of high strength of the coil's magnetic field. It is a melting furnace like this.

Furthermore, in order to confirm or display the open guidance field, 0 inside this guidance field.
It is also well known to install a ring line with indicator lamps.

The object of the invention is an electromagnetic energy transmission device of the type mentioned at the outset, in which the energy is made available for free use through the surface of a plate-like base, for example the surface of a table board, and in which the energy is The objective is to find an electromagnetic energy transmission device which can be introduced through a secondary device by simply introducing the secondary device into the alternating magnetic field generated in the primary device.

This object is, according to the present invention, in an electromagnetic energy transmission device that utilizes the action and characteristics of an electromagnetic alternating magnetic field by a primary device for generating a magnetic field and a secondary device for receiving and converting energy, wherein the primary device is It is composed of an oscillation circuit having a magnetic field generating coil at the final stage, and this primary side device is provided below the top surface of a plate-shaped base, and the oscillation circuit transmits an ultra-audio frequency of 5 KHz to 20 KHz beyond the top surface of the base. The secondary device consists of a ceramic container for the substance to be heated, and a protective layer of conductive or magnetically conductive thin foil is provided at the location of the container where heat is to be generated. This is accomplished by providing a cover and allowing the secondary device to be moved into and away from a position above the primary device in response to the magnetic field.

This device allows electrical energy to be delivered to a secondary device acting as a receiver according to its individual needs without the need for galvanic current coupling and without any disturbances such as noise generation due to leakage or energy wastage. I can give enough.

Very commonly there will be one secondary device associated with each primary device.

However, depending on the circumstances and objectives of the secondary devices, it may be possible to consider bringing several secondary devices into the alternating magnetic field of a single primary device.

In this case, the degree of freedom in the operation of the secondary device may be limited by fixed vibration points or sliding lines, as the case may be.

The active primary side device consists of one or more magnetic field generating coils, which are the final stage or final output extractor of the corresponding oscillation circuit and are each provided at a desired location under the surface of the plate-shaped base. The oscillating circuit can then be powered by a current source which is itself available for arbitrary and free use.

The oscillator circuit is provided for generating an electromagnetic alternating field at a superaudible frequency, such as 5 KHz to 20 KHz.

The device according to the invention is equipped with an electrical or magnetic conductor layer at the desired heat generation location of the passive secondary device, in which an electromagnetic alternating field acts as a heat source and generates heat causing losses. let

This heat loss is generated via the eddy current product of the electrical conductor layer, the reversal magnetization losses or the dielectric losses of the correspondingly designed components.

The degree of heat acceptance can be easily adjusted by the type and construction of the secondary device and also by shifting the device within the alternating electromagnetic field.

Heat harvesting can also be used for temperatures ranging from pure heat retention effects (continuous energy delivery rather than storage) to boiling and steaming.

In an advantageous embodiment of the primary device of the device, the primary device consists of a narrow strip of helically wound insulated conductor.
Two coils are provided.

This kind of strip winding itself is better known than the magnetically closed transformer, and is used in transformers because it has a large cross-section but is conveniently bent and the coil frame has a round wire with a cross-section of - This is because it can be made like a square wire or a square wire.

For the present invention, which deals with the generation of an open magnetic field, a novel effect arises, since although it would have been possible with previous equivalent solenoids, the strip winding provides a constant coupling to the conductor layer of the passive part. It is from.

The flat strip coil shape provides almost double the output power that can be decoupled.

A low-loss ferromagnetic core can be provided inside the coil, and in some cases also under the coil.

What became clear is that especially the 5KHz to 20KH used
z, it means that already with the generation of a relatively small magnetic field a sufficiently high voltage is generated in the conductor layer of the passive part, which voltage is sufficient, for example, to keep food at an enjoyable temperature. .

Experience has shown that for special uses as heating devices, the power application of the primary device is limited to approximately 15-2°W, thereby reducing the power consumption in the pan when several devices are operated simultaneously. It must be ensured that overtemperatures and troubles are somewhat avoided on the electrical supply side.

It is therefore possible to structurally couple the coil with the oscillator, which together makes it possible to have a portable device inside the dining table, for example.

The radiation efficiency limit keeps the self-losses of the coil and oscillator the same under control, thus preventing troublesome overheating of the table plate due to self-losses.

The supply circuit of the primary device, and thus the coil for generating the electromagnetic alternating field, can be constructed in various ways in a manner known per se and in a customary manner.

However, a well-designed circuit has two power transistors controlled in a push-pull manner, with a coil and a capacitor for generating the electromagnetic field at their collectors forming a poorly damped resonant circuit. There is.

A separate feedback coupling transformer is provided for self-excitation.

If necessary, an additional frequency-dependent regulating circuit can be provided between the base and emitter of the power transistor in the form of a resonant circuit with a regulating transistor and a parallel resistor.

For the use of secondary devices working in relatively high temperature ranges, it is advantageous to provide an intermediate layer between both the primary and secondary devices, which creates a heat return effect downwards.

In addition to using structurally separate intermediate positions, we propose here to form a plate-like base as a thermally insulating intermediate layer.

The lower surface of the secondary device can also be provided with appropriate thermal insulation in order to create a heat return effect downwards.

Other possibilities for receiving energy by the secondary device are:
For example, they also exist in the fields of cooling, light emission, mechanical energy and conversion into work.

In this case, one conductor winding, which is very commonly coupled to the energy-emitting end-stage device, is replaced by a conductor layer.

The plate-shaped base on which the primary side device is disposed below the surface is usually a table plate, as already mentioned, and this concept also includes folding tables in buses and airplanes, dining tables for hospital beds, and the like.

However, when referring to a plate-shaped base, it may also be a work desk, a laboratory table, or a plate arranged vertically or in any other position, such as a wall mirror, a shelf, etc.

The passive secondary device that functions as a heating device in this device is
It is formed as a thin conductive layer on one side or lower side of the bottom of the container to be heated.

This conductor layer can be sputtered or vapor deposited, for example, and can optionally be galvanically reinforced.

However, metal foil can also be used. In the case of ceramic containers in the broadest sense, the conductor layer is coated with a glaze or the like to prevent wear caused by automatic dishwashers.

If a foil is provided, it can be perforated to ensure good fixation.

Very generally, the conductor layer can be applied, for example with epoxy resin, to form a protective covering layer.

In some cases, a conductor layer made of ferromagnetic material may be chosen, thereby increasing the field line density of the electromagnetic alternating field introduced into the conductor layer somewhat.

Experience has shown that special steel utensils, such as silver serving plates, and other metal trays of sufficient size, when placed in an alternating magnetic field, retain their white tinge even without the addition of metal foil (underneath these). This will heat food and drinks sufficiently.

The conductor layer may also be formed as a separate heating element in the form of a metal foil provided on the elastic thermally insulating layer.

The invention will now be further described with reference to a device comprising both a primary and a secondary device, which is briefly schematically shown in the accompanying drawings.

FIG. 1 shows a device comprising an active primary device 2 arranged in a working plate 1 and a passive secondary device 3 placed on said working plate in the form of a dish to be heated.

The primary device 2 essentially consists of a coil 4, which in the illustrated embodiment is provided with a helically wound strip-shaped conductor 5 as a flat coil, which conductor has a power terminal on one side. 7
The power supply circuit 6 is connected to a power supply circuit 6 having a power supply circuit 6.

By means of the above-mentioned coils, an open magnetic field is generated, which forms a constant coupling with corresponding devices in the secondary arrangement, but other equivalent conventional solenoids may also be used.

A low-loss ferrimagnetic core can be installed inside the coil and, if necessary, outside the coil.

The electromagnetic alternating magnetic field generated is 5-20 K, Hz
.

It is therefore operated at frequencies in the relatively high audio frequency range.

It is therefore possible to avoid the negative interference that may occur at low frequencies.

The electrical internal losses of the induction coil are kept within control.

A thin conductive layer 8 made of, for example, a ferromagnetic material is provided at the bottom of the dish 3.

This warms up the contents of the container and thus leaves the edges of the dish cool at the desired location.

Similarly, a coil 9 is installed in the leg of the secondary device 3' as shown in FIG. Electrical energy can be sent to the motor 12 or the like.

Although the embodiment shown in FIG. 1 concerns the lower surface of the device being placed on the upper surface of a horizontal or at least horizontal table plate, the upper surface of the plate-like base may be highly inclined or even vertical. For example, a rubber suction device, a suction magnet, or the like can be provided as a mounting means that can be easily removed.

The metal layer 8 can be formed in various shapes and, for example, with perforations 14.
The perforation is made of metal foil on the underside of the plate 3,
It can be fixed with a coating layer 15 of glaze or epoxy resin to protect it from external mechanical influences.

It may also be a separate thermal pad, such as a grooved flexible foil 8.
' can be fixed onto a thermally insulating resilient base layer 16.

The elastic layer placed between the table board and the plate is made of fluffy cellulose, for example, in order to smoothly align the metal foil 8' with the bottom surface of the plate 3, which is usually slightly arcuate, and to heat it well. Formed from cushions.

The metal foil, on the other hand, is thermally insulated from the table plate by the layer 16, so that only small heat losses occur here.

If such a pad is loosely fitted, for example, between a saucer and a teacup, the drink in the teacup can be kept warm for any desired length of time.

This type of thermal pad can also be used for advertising printing and is cheap enough to be thrown away as is customary.

If there is no plate or other heat conductor placed on such a pad, the metal foil can be heated essentially at an alternating magnetic field power limited to 5 watts (since heating above 100°C is not possible). There is no danger of combustion or ignition.

Also, touching exposed hot foil is not dangerous at all, since thin metal foil cannot conduct heat away from the surrounding area quickly enough to cause skin burns.

The generated alternating magnetic field penetrates the table top made of wood, synthetic resin or glass, including the table hangers, napkins, etc. lying thereon, but does not cause any heating of these.

On the other hand, in the conductor layer 8 arranged in the container 3, as soon as this layer is placed in an alternating magnetic field, a temperature increase occurs which can be exploited.

In this case, the conductor layer 8 is thin and light so as not to impair the weight and handling of the container in any way.

The advantages of such a device are as follows.

As for the table board, it does not matter whether it is a dining table or a work desk; whatever kind of additional equipment it has, it does not take up much space, does not require special management, or does not require preheating in advance. There is no danger.

The desired precisely adjustable heat occurs where it is produced, i.e. at the bottom of the cooking dish, which is advantageous in terms of heat conservation, while the edges of the dish only get slightly warmer. Because it exists, you can grab it freely.

Depending on these circumstances, many possibilities of use arise.

In addition to the possibility of heat retention of food and drink on the dining table, which has been particularly shown, the applicability of the present device also extends to the above-mentioned situations in aircraft and buses, where nothing other than well-known heat retention equipment is carried in the first place. They also exist on folding tables and, for example, on dining table boards belonging to each hospital bed.

In this case, the safety of the device resulting from incorrect galvanic current coupling appears to be particularly important.

Of course, dishes and similar containers, as well as any other utensils and materials, can also be used in suitable equipment, without the traditional heat accumulation methods.
The desired volume of heat retention can be achieved for each night.

A suitable feeder circuit is, for example, a field coil 2 with a center tap.
0 and the capacitor 38 to form a slightly damped resonant circuit, which can be placed between the collectors of two push-pull controlled power transistors 24, 24'.

This supply DC voltage is applied to a capacitor 25 (herein the center tap of the coil 20 and the emitter of the transistor 24, 24').

transistor 24 in the negative half cycle of the resonant output voltage;
Blocking diodes 28 and 28' are provided to prevent an inhibiting backflow from occurring in the collector of 24'.

Self-excitation of the oscillator is provided by feedback through a separate transformer 26 whose transformation ratio is such that the oscillations are periodically interrupted as soon as more than the desired maximum power is drawn into the resonant circuit. , so that the transistor is prevented from being overloaded in time.

An adjustable resistor 27 connected in parallel with capacitor 21 and limiting the transistor base control current provided by transformer 26 serves to define the desired maximum output limit of the oscillator.

Resistor 29 serves as a starting point when starting up the device.

At no load, the resonant circuit forms a high collector cut-off resistance, causing the transistor to oscillate in a so-called "overvoltage state" with negligible current consumption.

Now, if we bring a metallic heating foil, for example on the underside of the dish, into the magnetic field of the coil 20, the characteristics of the resonant circuit will change with the characteristics of the control transformer being strongly suppressed.

The previous overvoltage situation on the collector side now passes with a significant power conversion in the resistor matching, ie the self-excitation frequency also increases.

In order to save on current consumption when in the connected device there is no heat recipient, e.g. plate 3 with foil 8, in the magnetic field of coil 20, instead of adjustable resistor 27, transistor 30 and a parallel resistor 34, as well as an additional oscillating circuit from the coil 31 and capacitor 32, can be provided.

Transistors 24 and 2 are connected to one of the windings of the coil 31.
4' emitter current flows.

The oscillating circuit 31.32 is an undamped collector circuit 38.
．． It is tuned to a resonance frequency of 20.

The oscillating circuit 31 , 32 ultimately sends a blocking DC voltage to the base of the regulating transistor 30 via the diode 33 .

Unless there is a damping heat receiver 8 in the magnetic field of the coil 20, the blocked transistor 30 causes the push-pull oscillator to oscillate with very small amplitude and low current consumption due to the high value resistor 34. .

Without a damping agent within the magnetic field of coil 20, the oscillation frequency increases significantly.

The vibrating circuits 31 and 32 that had been tuned no longer resonate,
The alternating voltage and the regulated direct current voltage also disappear when the voltage is turned off.

Transistor 30 opens and releases all generator power through enhanced base current control of transistors 24 and 24'.

The heat retention device with this circuit or the regulating circuit with the same effect as ρ is always kept energized with current and, first of all, if necessary (without having to actuate the closing switch specifically for this purpose). ), when the heat receiver 8 is brought into the magnetic field of the coil 20, a transition is made to the nominal power conversion.

Of course, the same applies to other secondary devices.

In general, it should be mentioned that any electrical device that is needed on a daily basis can be used in an adjustable device using the circuit according to the invention.

Preferred embodiments of the present invention can be summarized as follows.

(1) Primary side device for magnetic field generation and 2 for energy reception and conversion
In an electromagnetic energy transmission device that utilizes the action and characteristics of an electromagnetic alternating magnetic field with a secondary device, an alternating magnetic field is formed by placing the primary device under the upper surface of an arbitrary plate-shaped base and beyond the upper surface thereof. The primary side device consists of an oscillation circuit having a magnetic field generation coil at the final stage, and the oscillation circuit generates an alternating magnetic field with an ultraaudible frequency of 5 KHz to 20 KHz. The secondary device consists of a ceramic container for the substance to be heated, and the portion of the container where heat is to be generated is provided with a thin electrically conductive or magnetically conductive foil coated with a protective layer, and A secondary device that can be brought into a magnetic field can be releasably placed on the plate-like base or can be releasably fixed, and can be displaced relative to the primary device. Device.

(2) The device according to item 1 above, in which a plurality of secondary devices are arranged in a single primary device.

(3) The device according to item 2 above, wherein the degree of freedom of movement of the secondary device is restricted.

The device according to any of the above items 1 to 3, wherein the primary side devices are provided at desired locations under the upper surface of the plate-shaped base.

5. The device according to any of the above items 1 to 4, wherein the primary device is provided with a coil made of a conductor wound in a narrow spiral as the magnetic field generating coil.

(6) The power supply circuit of the primary side device has two power transistors controlled in a push-pull type, and the coil and capacitor for generating a magnetic field on their collector side resonate in one slightly damped resonance. The device according to any one of the above items 1 to 5, which constitutes a circuit.

(7) The device according to item 6, comprising a separate feedback transformer for self-excitation.

(8) an additional frequency-dependent regulating circuit in the form of a resonant circuit having a regulating transistor and a parallel resistor between the base and emitter of the power transistor;
The device according to paragraphs 1 and 7.

9. The device according to any of the above items 1 to 8, wherein the secondary device is a tableware, such as a plate or a container.

(10) The device according to item 9, wherein the conductor layer is formed as a foil, perforated, and protected by coating with epoxy resin.

(11) Decorated ceramics or chinaware
In the ninth embodiment, the conductive layer is located under the glaze.
Equipment described in Section.

(12) Item 9 above, wherein the conductor layer is formed of a ferromagnetic material.
Apparatus according to Section H.

03) When charging the secondary side equipment, in relatively high temperature areas, an intermediate layer is provided between the primary and secondary equipment to provide heat return (5) (4) (9). Items 1 to 12 above consisting of
Equipment described in Section.

04) The device according to item 13 above, wherein the secondary device is a metal foil fixed on an elastic thermally insulating layer and is provided as an independent heating element under the container or the like whose heat is to be retained.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the device with a primary device arranged in a table plate and a dish to be heated placed on this table plate as a secondary device; FIG. Figures 3, 4, and 5 show examples in which a secondary device formed as a ventilator acts on a primary device located in a
The figures are detailed views of possible configurations of conductor layers in the secondary device, and FIGS. 6 and 7 are diagrams showing examples of oscillation circuits for powering the primary device. 1... Table plate, 2... Primary side device, 3... Secondary side device, 4... Coil,
5...Conductor, 6...Power supply circuit, 7...
...Power terminal, 8...Conductor layer, 9...
...Coil, 12...Small motor, 13...
... Ventilator, 14... Perforation, 15...
... Covering layer, 16 ... Elastic base layer, 20 ...
...Field coil.

Claims (1)

[Claims] 1 Primary side device for magnetic field generation and 2 for energy reception/conversion
In an electromagnetic energy transmission device that utilizes the action and characteristics of an electromagnetic alternating magnetic field generated by a secondary device, the primary device is constituted by an oscillation circuit having a magnetic field generating coil at the final stage, and the primary device The oscillation circuit is provided under the upper surface of a plate-shaped base, and the oscillation circuit is provided at a frequency of 5 KHz to 20 K over the upper surface of the base.
The secondary device is configured to generate an alternating magnetic field at an ultra-audible frequency of Hz, and the secondary device consists of a ceramic container for the substance to be heated, with an electrically or magnetically conductive material in the area of the container where heat is to be generated. a thin foil coated with a protective layer, the secondary device being movable to and away from a position above the primary device in response to the magnetic field; The above device is characterized by: