Magnetic resonance heating device

Abstract

The present invention relates to a magnetic resonance heating device comprising: a resonant circuit; a power switching circuit. The power switching circuit includes two switching channels capable of high frequency switching and operates on the principle of a push-pull oscillator circuit or a multivibrator circuit, when combined with the resonant circuit will stabilize the switching frequency at the resonant frequency of the resonant circuit to produce high power sources to supply for heating applications. The magnetic resonance heating device according to the present invention may be provided as a tin welding machine, a non-contact heating device, a heating equipment for a plastic production system, an instant water heater, an induction cooker, etc.

Description

[0001] MAGNETIC RESONANCE HEATING DEVICE

[0002] TECHNICAL FIELD

[0003] The present invention relates to a magnetic resonance heating device, in particularly, to a magnetic resonance heating device capable of achieving rapid heating, good energy efficiency, and avoid the risk of electrical leakage to the outside. The magnetic resonance heating device is appliable used in many civil or industrial heating applications, e.g. be provided as a tin welding machine with an optimized structure and using a welding tip is made from nickel or steel with a high carbon content so that concentrating heat at a tip point of the welding tip and capable of stabilize the temperature around the Curie temperature of the material of the welding tip.

[0004] BACKGROUND

[0005] As known, the problem of generating heat or heating from the input energy of electricity is used very popularly and diversely in many areas of daily life. Such as handheld electronic circuit welding machines, water heaters, dryers, heat presses, heat guns, industrial welding apparatus, etc.

[0006] In general, different heating devices may have different structures, but they may use some common principles to convert electrical energy into heat energy, for example the Joule heating effect produced by an induced current, the Joule heating effect produced by Foucault / Eddy current, a thermal effect produced by the Magnetic Hysteresis. Each principle may have different advantages and disadvantages, and therefore, innovative solutions or different suitable additional designs are needed to increase energy efficiency and heating efficiency.

[0007] Tin welding machines is one of the heating devices that has appeared and been widely used for a relatively long time. Currently, on the market there may be found the types of tin welding machine as described below.

[0008] A simple resistance wire welding machine consists of a thermistor wire wound around a copper core. When DC or AC current passes through, the thermistor wire will be heated up (according to Joule-Lenz law) and heating the copper core inside, heat will be transferred along the copper core from the inside to the outside of a welding tip (often sharpened) to melt the tin at the point where the welding tip contacts. Disadvantages of the simple resistance wire welding machine is that the heating time is very slow, it can usually take up to about 5 minutes to heat up from when the welding tip in cool state until it reaches melting temperature of the tin. In addition, an electric current flows continuously through the thermistor wire during the welding process should cost electricity, a low performance and the thermistor wire may be broken in a very short time. In addition, because there is no temperature control, the welding tip is always at a high temperature during welding process making the welding tip susceptible to oxidation, wear and tear in a short time. And especially, the thermistor wire is capable of contact, leakage current to the copper core and transmit electricity to the welding tip, this leakage current may have high voltage causing dangerous electric shock to the user.

[0009] To overcome the problem of uncontrolled welding tip temperature, a thermistor wire welding machine with controllable temperature is made. The structure of the thermistor wire welding machine with controllable temperature is substantially similar to that of the simple resistance wire welding machine, except equipped with an external temperature sensor at the welding tip and an electronic processing circuit to adjust the temperature.

[0010] The thermistor wire welding machine with controllable temperature has a faster heat up time than that of the simple resistance wire welding machine, usually takes about 1 minute for heating for the welding tip in cool state until it reaches melting temperature of the tin. The welding tip temperature is controlled so it is more stable, prolonging the life of the welding tip. However, this type of welding machine also has many disadvantages that have not been overcome such as consuming a lot of electricity, low performance, the thermistor wire may be broken in a short time, and there is still a possibility of contact, leakage current causing dangerous electric shock to the user.

[0011] A power transformer inductive welding machine (or also known as a pulse welding machine) with a structure including a switch to turn on / off the power to the welding machine, a ferromagnetic transformer core (usually made from silicon steel), a primary copper coil, a secondary copper coil, a welding tip is made from a copper wire. The power transformer inductive welding machine shows the following advantages:

[0012] - faster heating time than that of the resistance wire welding machine, it usually takes about 6 seconds to heat up from when the welding tip in cool state until it reaches melting temperature of a tin;

[0013] - only supplying the power to the welding machine when needed, so it consumes less power and has higher efficiency than the of the resistance wire welding machine;

[0014] - the welding tip is double isolated from the input power source (isolation at a primary coil and at a secondary coil) so less likely to contact, electricity leakage to the welding tip, resulting in quite safe for users; and

[0015] - a lamp for illuminating the position to be welded is a filament bulb connected directly to a high voltage alternating current, in range of 100V to 220V.

[0016] However, the power transformer inductive welding machine still has certain disadvantages. Since the primary and secondary coils are wound and made from copper wires, and the ferromagnetic transformer core has a large size, the weight and size of the welding machine are very big (for example, as for a common power transformer inductive welding machine 150W, its weight can be up to 1,5 kg). The power transformer inductive welding machine works with an industrial frequency current (50hz) so the energy conversion efficiency in the transformer ferromagnetic core is not high, causes the core to heat up quickly, the whole welding machine body is quite hot during welding and may not weld continuously for a certain period of time. While the power transformer inductive welding machine not equipped with cooling fan, it may not operate continuously, and must wait for the machine to cool down before continuing to use it. The outer secondary coil is connected to the welding tip has the form of a bent copper bar, the welding tip end acts as a heating element to melt the welding material (for example, tin or lead) during welding process; said welding is very fast to damage, because the melting point of copper is relatively low. The lighting at the welding location is not bright enough and very susceptible to damage due to use of unstable high voltage power source. In addition, this type of said welding machine usually does not have a function which stabilize the welding tip temperature.

[0017] A tin welding machine for heating the welding tip by a LC resonant oscillator circuit is granted Vietnam Utility Solution Patent No. 2-0002103, corresponding to the application No. 2-2019-00170, made of compact electronic components and works on the principle of resonance oscillation, this type of welding machine shows the following advantages:

[0018] - the heating time of the welding tip is very fast (from the welding tip at a cooling state usually takes about 3 seconds to reach the temperature to melt the tin);

[0019] - a primary coil has ferrite core with compact size and light weight, can operate at very high frequency (about 100 Khz), achieving a large capacity with a small design size (for example, a welding machine with power 200W, weight only about 0,2 kg);

[0020] - use high performance semiconductor components (for example IGBT, or MOSFET, or FET) combined with LC resonant oscillation technique to provide a high- power, high-efficiency power conversion circuit;

[0021] - using low voltage DC input (for example about 12V DC), three level of isolations (insulation at a primary coil, insulation at a secondary coil, a ferrite core is almost non-conductive) so there is no contact or electrical leakage to the welding tip, very safe for users; and

[0022] - using programmable IC for precise and efficient control, IC may detect and adjust the temperature of the welding tip, generating an oscillator which controls IGBT, detect and protect an input voltage and current, controlling a fan to cool the welding machine body, etc.

[0023] However, the tin welding machine for heating the welding tip by a LC resonant oscillator circuit shows the following advantages:

[0024] - the heating time until solder melting is not yet optimized;

[0025] - the heating power generated by the resonant oscillator circuit using programmable IC may be inefficient, because in actual operation, the temperature and properties of the welding tip may change continuously, making the resonant frequency change accordingly, giving that the control performed by the IC according to the preprogrammed program lag behind the rate of change of temperature and properties of the soldering tip, resulting in a reduction of the efficiency by IC control;

[0026] - no LED light to illuminate a welding area;

[0027] - no power adjustment function; and

[0028] - no function to stabilize the temperature of the welding tip. It is obvious that some heating principles as described above for the mentioned types of welding machines, may also be applied for heating in any applications, and may be commonly referred to as heating devices.

[0029] Although, heating devices can be designed using various solutions, and have certain advantages. However, there are also disadvantages that need to be overcome or improved.

[0030] Therefore, there is a need for a magnetic resonance heating solution that can inherit or optimize one or more advantages, while overcoming or improving one or more disadvantages.

[0031] SUMMARY

[0032] An object of the present invention is to provide a magnetic resonance heating device, may overcome one or more of the above-mentioned problems.

[0033] Another object of the present invention is to provide a magnetic resonance heating device, may achieve a rapid heating, good energy efficiency, avoid the risk of electrical leakage to the outside, and capable of optimization the structure of the device.

[0034] Yet another object of the present invention is to provide a magnetic resonance heating device is used in one or more heating applications in civil or industrial fields.

[0035] Still another object of the present invention is to provide a magnetic resonance heating device is provided as a tin welding machine.

[0036] Various objects to be achieved by the present invention are not limited to the aforementioned objects, and those skilled in the art to which the disclosure pertains may clearly understand other objects from the following descriptions.

[0037] To achieve one or more above objects, the present invention provides, according to an aspect, the present invention provides a magnetic resonance heating device comprising: a resonant circuit includes main components are an inductor and a capacitor for generating a predetermined resonant frequency; a power switching circuit includes two switching channels capable of high frequency switching and operates on the principle of a push-pull oscillator circuit or a multivibrator circuit, wherein said two switching channels perform open and close alternately at an increasing switching frequency when combined with the resonant circuit to stabilize the switching frequency at the resonant frequency of the resonant circuit; a transformer core made from a strong magnetic material; a coil is provided as a form of a primary coil both acts as the inductor of the resonant circuit, and is wound around the transformer core for forming a primary circuit unit, so that when a varying current flows through said primary circuit unit generating a magnetic field that varies according to the frequency of the resonant circuit in the transformer core; a secondary circuit unit includes a secondary inductive frame, a first interconnection assembly, a second interconnection assembly, and a heating member, wherein: a frame is provided as the secondary inductive frame is an open frame made from a strong electrical conductivity and poor magnetic conductivity material, and having a first frame connection end and a second frame connection end are arranged at a distance for forming an open part of the secondary inductive frame, wherein said secondary inductive frame is curved from the first frame connection end, pass through the transformer core, to the second frame connection end so that when there is a varying magnetic field in the transformer core will produce an electric induction by the secondary inductive frame; the heating member is made from a strong electrical conductivity and strong magnetic conductivity material, and having a first heating member connection end and a second heating member connection end; a first interconnection assembly electrical and mechanical connects between the first heating member connection end and the first frame connection end, a second interconnection assembly electrical and mechanical connects between the second heating member connection end and the second frame connection end, wherein the secondary inductive frame, the first interconnection assembly, the second interconnection assembly, and the heating member are electrically interconnected and forming a closed circuit loop, when there is a varying magnetic field in the transformer core will produce an electric induction by the secondary inductive frame and generating an inductive current flows through the heating member and producing heat at said heating member, wherein the secondary inductive frame, the first interconnection assembly, the second interconnection assembly, and the heating member are mechanically interconnected and forming a structural unit, said structural unit forming said closed circuit loop capable of withstanding a high intensity and frequency current, and when any component of the secondary inductive frame, the first interconnection assembly, the second interconnection assembly, and the heating member is fixed in the magnetic resonance heating device will result in the entire of the secondary circuit unit be held in a fixed position.

[0038] Preferably, the secondary inductive frame is made from copper or copper-based materials, in a form of a flat bar is bent into an U-shaped.

[0039] The transformer core is in a ring-shaped and made from ferrite, sendust, or ferromagnetic powder.

[0040] Preferably, the primary circuit unit only includes said primary coil wound around the transformer core.

[0041] The power switching circuit uses high frequency switching electronic components, including but not limited to, MOSFET, IGBT, and Field Effect Transistors.

[0042] According to an embodiment, said device is a tin welding machine, and the heating member is made from nickel, steel with a carbon content is in the range of 0,6% to 1,7%, or similar materials.

[0043] According to an embodiment, said device further includes an inductive LED unit, said inductive LED unit includes an inductive support with built-in inductive coils, and LED lights are electrically connected to the inductive coils, wherein the inductive support is appropriately arranged with said secondary circuit unit, so that when there is a current flowing in the secondary circuit unit will produce an induced current flowing in the inductive coils of the inductive LED unit and supply power for the LED lights illuminate. Preferably, the inductive support is a robust heat-resistant glue unit with built-in inductive coils placed inside the inductive support while the inductive support is molded and not yet cured.

[0044] According to an embodiment, the heating member is a welding tip is made from a metal wire or a bent cylindrical metal rod for forming a welding tip end at the bent position, and the first and second heating members are ends of said metal wire or cylindrical metal rod.

[0045] According to an embodiment, each of the first and second interconnection assemblies includes a welding tip conducting pipe and a welding tip clamping pipe, wherein the welding tip clamping pipe has one end in a form of a collet, and one further end has a groove to fit the first frame connection end or the second frame connection end of the secondary inductive frame which is in a form of a flat bar is bent into an U-shaped.

[0046] Preferably, the inductive support has a first through hole and a second through hole for inserting through the welding tip clamping pipes for mounting and fixing the inductive support.

[0047] According to another aspect, the present invention provides a magnetic resonance heating device comprising: a resonant circuit includes main components are an inductor and a capacitor for generating a predetermined resonant frequency; a power switching circuit includes two switching channels capable of high frequency switching and operates on the principle of a push-pull oscillator circuit or a multivibrator circuit, ! wherein said two switching channels perform open and close alternately at an increasing switching frequency when combined with the resonant circuit to stabilize the switching frequency at the resonant frequency of the resonant circuit; at least one coil is provided as a form of a power coil acts as the inductor of the resonant circuit, so that generating a magnetic field that varies according to the frequency of the resonant circuit at said power coil to convert electromagnetic energy into thermal energy at an object to be heated located in the vicinity of the power coil; a frame includes a first frame part and a second frame part made from a strong electrical conductivity material; a first interconnection assembly is connected to the first frame part; and a second interconnection assembly is connected to the second frame part; wherein: the inductor of the resonant circuit is connected between the first interconnection assembly and the second interconnection assembly, and the capacitor of the resonant circuit is connected between a first frame part and a second frame part, for forming a closed circuit loop capable of withstanding a high intensity and frequency current.

[0048] According to an embodiment, the power coil is provided by bending electrical wires into a spring shape to obtain a spring power coil.

[0049] Preferably, the object to be heated is in a cylindrical shape made from magnetic materials, is arranged of placed into a hollow inside space of the spring power coil to be heated through the conversion of electromagnetic energy into thermal energy.

[0050] According to an embodiment, the object to be heated is in a hollow cylindrical shape to contain matters or raw materials need to be heated inside said object to be heated.

[0051] Optionally, said matters or raw materials are water, plastic, or material to be melted, or similar materials.

[0052] According to an embodiment, the power coil is provided by bending electrical wires into plurality of rounds on one or more planes for heating for an object to be heated with a flat surface made from magnetic materials when said flat surface is arranged or placed in the vicinity of the power coil.

[0053] According to an embodiment, said device further includes an open ring-shaped core partially cut to form a gap, and wherein the power coil is wound around the open ring-shaped core, and an object to be heated is made from a non-magnetic metal is arranged or put in the gap to be heated.

[0054] BRIEF DESCRIPTION OF THE DRAWINGS FIG.1A is a simplified block diagram illustrating a magnetic resonance heating device according to a preferred embodiment of the present invention;

[0055] FIG. IB is a simplified block diagram illustrating a magnetic resonance heating device according to another preferred embodiment of the present invention;

[0056] FIG.1C is a simplified block diagram illustrating a magnetic resonance heating device according to yet another preferred embodiment of the present invention;

[0057] FIG.2 is a perspective view illustrating a tin welding machine according to an implementing embodiment of the present invention, is provided in a form of a handheld welding gun with one side cover is separated to show main components inside;

[0058] FIG.3 is a perspective view of a tin welding machine with some components removed for illustrating a power unit and a heating unit / a secondary circuit unit according to an implementing embodiment of the present invention;

[0059] FIG.4 is a perspective view illustrating more clearly a welding tip is assembled with a welding tip conducting pipe and a welding tip clamping pipe; FIG.5 is a perspective view illustrating an inductive LED unit according to an implementing embodiment of the present invention;

[0060] FIG.6 is a perspective view illustrating more clearly a press button and an input supplying source according to an implementing embodiment of the present invention;

[0061] FIG.7 is a circuit diagram showing the operating principle of a power switching circuit and a resonant circuit;

[0062] FIG.8 is a perspective view illustrating a power unit according to a preferred embodiment of the present invention;

[0063] FIG.9 is a perspective view illustrating an object to be heated is placed in a hollow inside space of a power coil, to be heated;

[0064] FIG.10 is a perspective view illustrating a magnetic resonance heating device is applied as an instant water heater;

[0065] FIG.11 is a perspective view illustrating a magnetic resonance heating device is applied as the heating device used in plastic production systems;

[0066] FIG.12 is a perspective view illustrating a magnetic resonance heating device is applied as an induction cooker; and

[0067] FIG.13 is a perspective view illustrating a magnetic resonance heating device using an open ring-shaped core for heating an object to be heated made of a nonmagnetic material according to a preferred embodiment of the present invention.

[0068] DESCRIPTION OF EMBODIMENTS

[0069] Hereinafter, advantages, efficiencies, and inventive concepts of the present invention shall be understood more clearly through the detailed description of the preferred embodiments with reference to the accompanying drawings. In the drawings, same reference numbers are intended to indicate same or equivalent components or elements and commonly used in the whole description, therefore in several drawings or several parts of a drawings may not show one or more reference numbers for a purpose that makes the drawings becoming simplified and facilitating for showing composed components or different inventive concepts of the present invention, in this scenario, relationships between certain components or elements with corresponding reference numbers may be clearly illustrated when referring to other drawings or other components on the drawing. In addition, the components and elements illustrated in the drawings is not complied actual sizes and shapes, several components or elements shall be exaggerated and may be presented by simplified blocks for illustrated purposes and facilitating for descriptive purpose. Therefore, it should be understood that embodiments described herein is only exemplary for fully understanding of the inventive steps and advantages of the present invention, without any limitation of the present invention to the embodiments.

[0070] In general, the present invention is intended to provide a magnetic resonance heating device, suitable for use in applications requiring rapid heating, good energy efficiency, avoid the risk of electrical leakage to the outside, and capable of optimization the structure of the device. Heating can be done by performing on at least one heating member or a part of the heating member and may be applied in many different fields without any limitations.

[0071] In FIG.l A is a simplified block diagram illustrating a magnetic resonance heating device according to a preferred embodiment of the present invention.

[0072] As shown in the drawing, the magnetic resonance heating device according to this embodiment substantially includes a power switching circuit 100; a resonant circuit 200; a primary circuit unit 300; a transformer core 400; and a secondary circuit unit 800 including a secondary inductive frame 500, a first interconnection assembly 600a, a second interconnection assembly 600b, and a heating member 700.

[0073] The resonant circuit 200 includes main components are an inductor and a capacitor for generating a predetermined resonant frequency. The power switching circuit 100 includes two switching channels capable of high frequency switching and operates on the principle of a push-pull oscillator circuit or a multivibrator circuit. Said two switching channels perform open and close alternately at an increasing switching frequency when combined with the resonant circuit 200 to stabilize the switching frequency at the resonant frequency of the resonant circuit 200.

[0074] The transformer core 400 is made from a strong magnetic material, is combined with the primary circuit unit 300 and the secondary circuit unit 800 providing similar operations on the principle of a main power transformer, that is supplying a main heating power for the heating member 700.

[0075] According to this embodiment, a group of components includes the power switching circuit 100; the resonant circuit 200; the primary circuit unit 300; the transformer core 400 may be collectively referred to as a power unit 900. The secondary circuit unit 800 may be referred to as a heating unit 800 in equivalent and interchangeable manners.

[0076] The primary circuit unit 300, is electrically connected to the power switching circuit 100 and the resonant circuit 200, and is appropriately arranged with a transformer core 400 so that when a varying current flows through the primary circuit unit 300 will generate a varying magnetic field in the transformer core 400.

[0077] The secondary inductive frame 500 is provided in a form of an open frame made from a strong electrical conductivity and poor magnetic conductivity material, and having a first frame connection end and a second frame connection end are arranged at a distance for forming an open part of the secondary inductive frame. Said secondary inductive frame 500 is curved from the first frame connection end, pass through the transformer core 400, to the second frame connection end so that when there is a varying magnetic field in the transformer core 400 will produce an electric induction by the secondary inductive frame 500.

[0078] The heating member 700 is made from a strong electrical conductivity and strong magnetic conductivity material, and having a first heating member connection end and a second heating member connection end.

[0079] A first interconnection assembly 600a electrical and mechanical connects between the first heating member connection end and the first frame connection end, a second interconnection assembly 600b electrical and mechanical connects between the second heating member connection end and the second frame connection end.

[0080] The secondary inductive frame 500, the first interconnection assembly 600a, the second interconnection assembly 600b, and the heating member 700 are electrically interconnected and forming a closed circuit loop, when there is a varying magnetic field in the transformer core 400 will produce an electric induction by the secondary inductive frame 500 and generating an inductive current flows through the heating member 700 and generating heat at said heating member 700. Simultaneously, the secondary inductive frame 500, the first interconnection assembly 600a, the second interconnection assembly 600b, and the heating member 700 are also mechanically interconnected and forming a structural unit capable of withstanding a high intensity and frequency current, when any component of the secondary inductive frame 500, the first interconnection assembly 600a, the second interconnection assembly 600b, and the heating member 700 fixed in the magnetic resonance heating device resulting in the entire of the secondary circuit unit 800 will be fixed. This is supposed to simplify the structure of the device due to integrating all components with heating function and structural units into the secondary circuit unit 800, thereby optimizing the structure of the device and may also significantly increase the durability of the device, such as due to using the secondary inductive frame 500 instead of a traditional coil, for example.

[0081] According to one or more embodiments, the secondary inductive frame 500 may be made from copper or copper-based materials, in a form of a flat bar is bent into an U-shaped.

[0082] The transformer core 400 is in a ring-shaped and made from ferrite, sendust, ferromagnetic powder, or similar materials.

[0083] The primary circuit unit 300 may include a primary coil is wound around a transformer core 400. But it is not limited thereto, the primary circuit unit 300 may use a flat structure coil, for example wire loops are printed circuit lines provided on one or more printed circuit layers and arranged next to each other to generate an inductance.

[0084] The power switching circuit 100 may use high frequency switching electronic components, such as MOSFET, IGBT, or Field Effect Transistors.

[0085] In FIG. IB is a simplified block diagram illustrating a magnetic resonance heating device according to another preferred embodiment of the present invention.

[0086] As shown in the drawing, the magnetic resonance heating device according to this embodiment substantially includes a power switching circuit 100; a resonant circuit 200B; a primary coil 300B; a transformer core 400; and a secondary circuit unit 800 including a secondary inductive frame 500, a first interconnection assembly 600a, a second interconnection assembly 600b, and a heating member 700.

[0087] According to this preferred embodiment, the primary coil 300B is wound around the transformer core 400 to form a primary circuit unit of a transformer, simultaneously the primary coil 300B also plays a role as an inductor of the resonant circuit 200B. The resonant circuit 200B further includes a non-polarized capacitor for generating a predetermined resonant frequency.

[0088] The power switching circuit 100 includes two switching channels capable of high frequency switching and operates on the principle of a push-pull oscillator circuit or a multivibrator circuit. Said two switching channels perform open and close alternately at an increasing switching frequency when combined with the resonant circuit 200B to stabilize the switching frequency at the resonant frequency of the resonant circuit 200B.

[0089] The secondary inductive frame 500 is provided in a form of an open frame made from a strong electrical conductivity and poor magnetic conductivity material, and having a first frame connection end and a second frame connection end are arranged at a distance for forming an open part of the secondary inductive frame. Said secondary inductive frame 500 is curved from the first frame connection end, pass through the transformer core 400, to the second frame connection end so that when there is a varying magnetic field in the transformer core 400 will produce an electric induction by the secondary inductive frame 500. The secondary inductive frame 500, the first interconnection assembly 600a, the second interconnection assembly 600b, and the heating member 700 form a secondary circuit unit 800. The transformer core 400 is combined with the primary coil 300B and the secondary circuit unit 800 generating operations of a transformer, providing heating power for the heating member 700.

[0090] As also be seen in FIG. IB, a magnetic core of the primary coil 300B and a magnetic core pass through the secondary inductive frame 500 are parts of the transformer core 400. According to this arrangement, when there is an electric current pass through the primary coil 300B will produce a magnetic flux at the transformer core 400 and generating an inductive current at the secondary circuit unit 800.

[0091] According to this embodiment, a group of components includes the power switching circuit 100; the resonant circuit 200B; the transformer core 400 may be collectively referred to as a power unit 900B.

[0092] In FIG.1C is a simplified block diagram illustrating a magnetic resonance heating device according to yet another preferred embodiment of the present invention.

[0093] As shown in the drawing, the magnetic resonance heating device according to this embodiment substantially includes a power switching circuit 100; a resonant circuit 200C; a power coil 300C; a frame 500C; a first interconnection assembly 600a; a second interconnection assembly 600b; and an object to be heated 700C.

[0094] According to this preferred embodiment, the power coil 300C plays the role of an inductor of the resonant circuit 200C. The resonant circuit 200C further includes a non-polarized capacitor C for generating a predetermined resonant frequency.

[0095] The power switching circuit 100 includes two switching channels capable of high frequency switching and operates on the principle of a push-pull oscillator circuit or a multivibrator circuit. Said two switching channels perform open and close alternately at an increasing switching frequency when combined with the resonant circuit 200C to stabilize the switching frequency at the resonant frequency of the resonant circuit 200C.

[0096] The frame 500C, the first interconnection assembly 600a, and the second interconnection assembly 600b may be structured to be assembled and disassembled. When they are assembled / fitted together will form a relatively robust structural unit, thereby when any component of the frame 500C, the first interconnection assembly 600a, and the second interconnection assembly 600b is fixed resulting in the entire of said structural unit will be fixed. Preferably, the frame 500C, the first interconnection assembly 600a, and the second interconnection assembly 600b are made from conductive materials. In this way, the power coil 300C can be easily assembled with said structural unit and easily electrically connected.

[0097] According to this embodiment, a group of components includes the power switching circuit 100; the resonant circuit 200C may be collectively referred to as a power unit 900C.

[0098] In comparison to the embodiments are shown in FIG. IB and FIG.1C, the magnetic resonance heating device according to this embodiment does not use “a transformer”, and the object to be heated 700C is located in the vicinity of the power coil 300C is achieved through the conversion of electromagnetic energy into thermal energy.

[0099] Next, the present invention will be described in more detail in the case a magnetic resonance heating device according to the present invention is provided in a form of a tin welding machine.

[0100] In FIG.2 is a perspective view illustrating a tin welding machine according to an implementing embodiment of the present invention, is provided in a form of a handheld welding gun with one side cover is separated to show main components inside.

[0101] As shown in the drawing, the tin welding machine according to this embodiment includes a welding machine housing 10, an inductive LED unit 11, a press button 12, an input supplying source 13, a secondary circuit unit (or also referred to as a heating unit) 800, and a power unit 900.

[0102] According to the present invention, the welding machine housing is made from two halves fitted together to provide a storage space and for mounting components of the tin welding machine inside. When fully assembled the tin welding machine is shaped as a welding gun with a handle that is convenient for the user to hold, and with the press button conveniently located for users to press while holding. When the press button is pressed, the input supplying source 13 will supply electricity to the power unit 900 and converted into heat by the heating unit 800 heating the heating member 700 and simultaneously turn on LED lights of the inductive LED unit 11. In FIG.3 is a perspective view of a tin welding machine with some components removed for illustrating a power unit and a heating unit / a secondary circuit unit according to an implementing embodiment of the present invention.

[0103] As shown in the drawing, the heating unit includes a secondary inductive frame 500; a first interconnection assembly 600a including a welding tip conducting pipe 600al and a welding tip clamping pipe 600a2; a second interconnection assembly 600b includes a welding tip conducting pipe 600b 1 and a welding tip clamping pipe 600b2; and a heating member 700 is in form of a welding tip.

[0104] The secondary inductive frame 500 is made from a strong electrical conductivity and poor magnetic conductivity metal, may preferably be made from copper or copperbased materials. Said secondary inductive frame 500 is provided in a form of a flat bar is bent into an U-shaped.

[0105] The welding tip conducting pipes 600al and 600b 1 are made from a strong electrical conductivity and poor magnetic conductivity metal, preferably copper (Cu), brass (Cu3Zn2), aluminum (Al), titan (Ti), or materials with similar properties. The welding tip conducting pipes 600al and 600b 1 are tubular.

[0106] The welding tip clamping pipes 600a2 and 600b2 are made from a strong electrical conductivity and poor magnetic conductivity metal, preferably copper (Cu), brass (Cu3Zn2), aluminum (Al), titan (Ti), or materials with similar properties. The welding tip clamping pipes 600a2 and 600b2 are in form of collets, providing to clamp the welding tip securely, while also providing to assemble and replace the welding tip in easy and convenient way.

[0107] The welding tip clamping pipes 600a2 and 600b2 has one end in a form of a collet, and one further end has a groove to fit a first frame connection end or a second frame connection end of the secondary inductive frame 500 in a form of a flat bar is bent into an U-shaped.

[0108] The heating member 700 is in form of a welding tip made from a metal with strong electrical conductivity, strong magnetic conductivity and thermal stability, preferably is made from nickel, steel with a carbon content is in the range of 0,6% to 1,7%, or similar materials. The welding tip may be made from a metal wire or a bent cylindrical metal rod for forming a welding tip end at the bent position, but it is not limited thereto. Optionally, the welding tip end or the welding tip end may be shaped into a pointed shape, blade shape, or fitted with appropriately shaped metal parts to increase contact efficiency with the welding position.

[0109] Back to FIG.3, the power unit as shown including the power switching circuit 100 using switching elements 101, bias resistors 102, and diodes 103 has an effect of suppressing pulses to create oscillations for the switching elements; the resonant circuit 200 uses a non-polarized capacitor 201 and an inductor; the primary circuit unit 300B includes a primary coil is made from copper or aluminum; and a transformer core 400.

[0110] The switching elements 101 are electronic power switching elements, capable of switching at high frequencies such as MOSFET, IGBT, Field Effect Transistors, or similar electronic elements.

[0111] The primary coil of the primary circuit unit 300B is used as the inductor of the resonant circuit 200 and the capacitor 201 may be used as a capacitive component of the resonant circuit 200. That is the resonant circuit 200 is composed of the capacitor 201 and the primary coil of the primary circuit unit 300B.

[0112] Obviously, the present invention may be implemented in different ways, for example an inductor 202 and the primary coil of a primary circuit unit 300B may be used in combination in the resonant circuit 200 to form an inductor component of the resonant circuit 200 without any limitation.

[0113] The transformer core 400 is made from a strong magnetic material and works well at high frequencies, preferably ferrite, sendust, ferromagnetic powder, or similar materials. Said transformer core 400 may have a ring-shaped structure, a hollow cylinder, or any suitable shape, such as a hollow rectangle shape for example.

[0114] In FIG.4 is a perspective view illustrating more clearly a welding tip is assembled with a welding tip conducting pipe and a welding tip clamping pipe.

[0115] As shown in the drawing, the welding tip is folded to form a welding tip end 701 and two welding tip branches 702. The welding tip branches 702 are inserted through the welding tip conducting pipes 600al and 600b 1, and clamped by collet ends of the welding tip clamping pipes 600a2 and 600b2.

[0116] It is obvious that, components of the heating unit including the secondary inductive frame 500; the first interconnection assembly 600a; the second interconnection assembly 600b; and the heating member 700 may be assembled and disassembled easily and conveniently. When they are assembled together will form a relatively robust mechanical structure, so that when any component of the secondary inductive frame 500; the first interconnection assembly 600a; the second interconnection assembly 600b; and the heating member 700 is fixed resulting in the entire of said mechanical structure will be fixed. For example, when the secondary inductive frame 500 in a form of a flat bar is bent into an U-shaped or the welding tip clamping pipes 600a2 and 600b2 are clamped and secured by a suitable mechanism of a housing 10, resulting in the entire of the heating unit (or the secondary circuit unit 800) will be fixed conveniently.

[0117] Furthermore, said using of the secondary inductive frame to replace for a traditional secondary coil, is supposed that not only significantly reduce intermediate electrical connections but also reduce the possibility of fire damage and significantly increases the overall structural strength of the device.

[0118] In FIG.5 is a perspective view illustrating an inductive LED unit according to an implementing embodiment of the present invention.

[0119] Basically, said inductive LED unit includes an inductive support 111 with built- in inductive coils, and LED lights 112 are electrically connected to the inductive coils. The inductive support 111 is appropriately arranged with said secondary circuit unit, so that when there is a current flowing in the secondary circuit unit will produce an induced current flowing in the inductive coils of the inductive LED unit and supplying power for the LED lights 112 to illuminate.

[0120] Preferably, the inductive support 111 is a robust heat-resistant glue unit with built-in inductive coils put inside an inductive support while said inductive support is molded and not yet cured.

[0121] As also be seen in the drawing, the inductive support 111 has a first through hole 113a and a second through hole 113b for inserting through the welding tip clamping pipes 600a2 and 600b2 (see FIG.2 as for a reference) for mounting and fixing the inductive support 111 in a proper position relative to the secondary inductive frame.

[0122] Optionally, the inductive support 111 may be coupled and / or mounted to the housing 10 to increase the robustness of the heating unit onto the device.

[0123] According to an optional embodiment, a switch may be equipped between the LED lights and the inductive coils which are placed in the inductive support, allows users to operate the switch to turn on / off the lighting function of the LED lights.

[0124] It can be seen that all the components are exposed to the outside of the tin welding machine according to the present invention, for example the welding tip and the LED lights, are powered through an induction, therefore, risks of high voltage leakage to the outside of the tin welding machine are substantially eliminated.

[0125] In FIG.6 is a perspective view illustrating more clearly a press button and an input supplying source according to an implementing embodiment of the present invention.

[0126] As shown in the drawing, the input supplying source uses power switches 131 and a microcontroller 132.

[0127] The power switches 131 are electronic power switching elements, capable of switching at high frequency, preferably MOSFET, IGBT, Field Effect Transistors, or similar electronic elements. The microcontroller 132 may be a programmable IC, is connected to a press button 12 acts as an on / off switch and the power switches 131, and generating pulses to control said power unit.

[0128] Preferably, the press button 12, the power switches 131, and the microcontroller 132 are arranged on a same circuit board.

[0129] In FIG.7 is a circuit diagram showing the operating principle of a power switching circuit and a resonant circuit.

[0130] According to the circuit diagram as shown in the drawing, when a power is supplied, the same voltage will be applied at gates of two Field Effect Transistors QI, Q2. However, due to the production process, actually makes the Field Effect Transistors QI, Q2 as arbitrary within standards not exactly identical in specifications. Resulting one of the two Field Effect Transistors QI, Q2 will conduct a current at first (similar to the operation of a multivibrator). When said one Field Effect Transistor works, the remain one Field Effect Transistor will stop conducting, due to the gate of the remain one Field Effect Transistor is pulled down to 0V.

[0131] However, due to a suddenly closing of a Field Effect Transistor, through a LC circuit, a short duration high voltage sinusoidal pulse has been generated on the gate of another Field Effect Transistor. Said voltage sinusoidal pulse simultaneously results in stopping of a Field Effect Transistor which is being in conducting state and recovering a gate voltage for another remain Field Effect Transistor which is being in nonconducting state. The same process happens over and over again on the two Field Effect Transistors QI and Q2 making repeating cycles.

[0132] Said repeating cycles perform open and close alternately at an increasing switching frequency, and continue until the switching frequency stabilizes at the resonant frequency, that is make the mentioned circuit oscillate at the resonant frequency of the LC circuit.

[0133] In addition diodes DI and D2 have a task of quickly discharging a gate capacitance of the Field Effect Transistors, make switching operations to be fast.

[0134] An inductor L and inductors LI, L2 are shown with cores, the cores of these inductors may be different and may be any magnetic cores, for example ferrite cores, ferromagnetic cores, or air cores, and without any limitation.

[0135] In FIG.8 is a perspective view illustrating a power unit according to a preferred embodiment of the present invention.

[0136] As shown in the drawing, the power unit 900C (also illustrated in FIG.1C) includes a power switching circuit 100 using switching elements 101, bias resistors 102, and diodes 103 with an effect of suppressing pulses to create oscillation for switching elements; a resonant circuit 200C using a non-polarized capacitor 201 and a power coil 300C. The switching elements 101 are electronic power switching elements, capable of switching at high frequency such as MOSFET, IGBT, Field Effect Transistors, or similar electronic elements. The power unit 900C also includes inductors 202 as well.

[0137] The power coil 300C is provided by bending electrical wires into a spring shape to obtain a spring power coil with two coil ends 301, 302, and a hollow inside space 300hs.

[0138] The frame 500C includes a first frame part and a second frame part made from a strong electrical conductivity material. A first interconnection assembly 600a is connected to the first frame part, and a second interconnection assembly 600b is connected to the second frame part. An inductor (the power coil 300C) of the resonant circuit is connected between the first interconnection assembly 600a and the second interconnection assembly 600b, and the capacitor 201 of the resonant circuit is connected between the first frame part and the second frame part, for forming a closed circuit loop capable of withstanding a high intensity and frequency current.

[0139] The first and second interconnection assemblies 600a and 600b according to this embodiment have substantially the same structure as that of members indicated as 600a2 and 600b2 which are illustrated and described in FIG.3. The two coil ends 301, 302 may be easily assembled and disassembled from the first and second interconnection assemblies 600a and 600b conveniently, such as for a replacement for example.

[0140] It is obvious that, based on the frame 500C, the first and second interconnection assemblies 600a and 600b are provided in forms of robust mechanical structures, the power coil 300C may be easily assembled and be held at a fixed position easily, ensuring safe and stable operation of the magnetic resonance heating device.

[0141] According to one or more embodiments, the components which include the frame 500C, the switching elements 101, the bias resistors 102, the diodes 103, the capacitor 201, the inductors 202, and a portion of the first and second interconnection assemblies 600a and 600b, preferably are arranged in a housing unit (indicated as a reference number 900CH in FIG.8). In this way, the power unit 900C substantially includes the housing unit 900CH and the power coil 300C protruding outward, so that it is easily for assembling, using and protecting the components of the power unit 900C.

[0142] In FIG.9 is a perspective view illustrating an object to be heated is placed in a hollow inside space of a power coil, to be heated.

[0143] As shown in the drawing, the object to be heated 700C is placed in the hollow inside space 300hs of the power coil 300C, to be heated. The power coil 300C has coil ends 301, 302 are fixed by the same manner as illustrated and described in FIG.8. The object to be heated 700C is in a cylindrical shape made from magnetic materials, when there is a varying magnetic field in the power coil 300C will generate eddy currents and / or induced currents at the object to be heated 700C, converting electromagnetic energy into thermal energy and heating the object to be heated 700C.

[0144] Preferably, the power coil 300C is provided by an electrical conductive wire which is made from copper or copper-based materials with a rectangular cross section, wound in a thin side direction, so that wider sides of the rectangular cross section of the electrical conductive wire always perpendicular to a central axis of the power coil 300C. The object to be heated 700C will be arranged of placed into a hollow inside space 300hs. This arrangement increases the flux density passing through the object to be heated 700C, thereby improving efficiency and heat concentration.

[0145] According to one or more exemplary embodiments, the object to be heated is provided in a hollow cylindrical shape to contain matters or raw materials which need to be heated inside said object to be heated. Said matters or raw materials may be water, plastic, materials need to be melted, or any materials need to be heated.

[0146] In FIG.10 is a perspective view illustrating a magnetic resonance heating device is applied as an instant water heater.

[0147] As shown in the drawing, the instant water heater 1000 includes a power unit 900C and an object to be heated 700C. The power unit 900C may be the power unit 900C as shown and described in FIG.8. The object to be heated 700C is in a hollow cylindrical shape to contain water inside, and is placed fixedly in the power coil 300C of a power unit 900C, to be heated.

[0148] In general, the object to be heated 700C has a water inlet and a water outlet (not shown in the drawings) as for the water to be circulated through the object to be heated 700C. When the object to be heated 700C is heated, the water is contained inside the object to be heated 700C is also heated and circulated continuously to provide hot water during in use. The water inlet and the water outlet are preferably disposed lower than the power coil 300C to increase an electrical safety.

[0149] In FIG.11 is a perspective view illustrating a magnetic resonance heating device is applied as the heating device used in plastic production systems.

[0150] As shown in the drawing, the heating device 2000 used in the plastic production systems includes plurality of power units 900C, an object to be heated 700C, a control cabinet 2001, a screw motor 2002, a feed hopper 2003, a power supply line 2004, a heat insulation pipe or layers 2005, and a plastic outlet 2006.

[0151] Each of the power units 900C may be the power unit 900C as shown and described in FIG.8, and includes the housing unit 900CH with components including the frame 500C, the switching elements 101, the bias resistors 102, the diodes 103, the capacitor 201, the inductors 202, and a portion of the first and second interconnection assemblies 600a and 600b; and the power coil 300C.

[0152] According to this embodiment, the object to be heated 700C is a conventional cylinder, for example a cylinder used in a known plastic injection molding machine. Inside the cylinder there is a screw arranged (not shown in the drawings) is driven by the screw motor 2002. The power coils 300C are arranged at locations that need heating around the object to be heated 700C is in form a cylinder. When the plastic is fed through the feed hopper 2003, will be pushed by the screw to move inside the cylinder, passing through the positions heated by the power coils 300C, to the plastic outlet 2006, and supplying to the next stages in the plastic production system.

[0153] Although in FIG.11 shows the number of the power units 900C are 4, however the present invention is not limited thereto, any quantity or number may be used depending on the size, capacity, and design of the plastic production system. In addition each of the housing units 900CH may be connected and supplied power to more than one power coil 300C.

[0154] In FIG.12 is a perspective view illustrating a magnetic resonance heating device is applied as an induction cooker.

[0155] As shown in the drawing, the induction cooker 3000 includes a power unit 900C and an object to be heated 700C. The power unit 900C may be the power unit 900C as shown and described in FIG.8. The power coil 300C of the power unit 900C is provided by bending electrical wires into plurality of rounds on one or more planes for heating for the object to be heated 700C with a flat surface made from magnetic materials when said flat surface is arranged or placed in the vicinity of the power coil 300C. The object to be heated 700C is an induction cooker made of magnetic materials, and placed above the power coil 300C of the power unit 900C, to be heated similar to heating for cooking utensils by the conventional induction cooker.

[0156] In FIG.13 is a perspective view illustrating a magnetic resonance heating device using an open ring-shaped core for heating an object to be heated made of a nonmagnetic material according to a preferred embodiment of the present invention. In general, a magnetic resonance heating device according to this embodiment has similar structure and characteristics to that of the magnetic resonance heating devices according to above described embodiments, excepting that said device further includes an open ring-shaped core 300fr partially cut to form a gap 300gap. The power coil 300C has coil ends 301, 302 are fixed by the same manner as illustrated and described in FIG.8, and is wound around the open ring-shaped core 300fr. The object to be heated 700C is made from a non-magnetic metal, such as copper, aluminum, stainless steel, titanium and similar metals. The object to be heated 700C will be arranged or put in the gap 300gap, to be heated. By the gap 300gap, a flux density pass through the object to be heated 700C well concentrated and greatly improve heating efficiency resulting from eddy currents and / or induced currents generated concentrating at the position of the object to be heated 700C which is inside the gap 300gap, even in case the object to be heated 700C is made from a non-magnetic metal.

[0157] According to one or more embodiments, a magnetic resonance heating device according to the present invention with structure and characteristics as described above and using a heating power generating circuit is a resonant oscillator circuit having a high resonant frequency, for example equal to or greater than 20Khz. Such heating device is supposed to be capable to achieve a rapid heating and simultaneously a stable heating temperature, for example at a welding tip / a welding tip end as will be described and explained in more detail below.

[0158] Fast heating

[0159] As for a magnetic resonance heating device is provided in a form of a tin welding machine with a welding tip made from Ni or steel with a carbon content is 0,6% to 1,7%; a welding tip conducting pipe and a welding tip clamping pipe are made from copper (Cu), brass (Cu3Zn2), aluminum (Al), or titan (Ti). Applying the principle of a LC selfoscillating circuit, when the primary coil of the primary circuit unit 300 plays the role of the inductor is combined with the capacitor 201 will oscillate in a resonance and generating a varied alternating magnetic field in the transformer core 400, at that time two ends of U-shape of the secondary inductive frame 500 in a form of a flat bar is bent into an U-shaped will generate an alternating electromotive force with the same frequency as the resonant current. Thanks to this resonance property, the circuit of the tin welding machine will substantially generate a current with a maximum value and an optimized efficiency, wherein the energy conversion efficiency may be approximately 100%, and coscp is approximately 1.

[0160] Since the secondary inductive frame, the welding tip conducting pipes, the welding tip clamping pipes, and the welding tip forming a closed circuit loop which plays the role of a secondary circuit / a secondary coil, when operating, a very large alternating current will appear in this secondary circuit and has the same frequency as the resonant current in the primary circuit, and of course, this current runs through the welding tip end and efficiently converted into a heating energy.

[0161] Since welding tip is made from a metal with strong electrical and magnetic conductivity so when there is a strong alternating current, high frequency running through will generate three factors that make the welding tip increase in temperature very quickly as explained as below.

[0162] Similarly, a magnetic resonance heating device according to the present invention when used in other applications is also supposed to capable of rapid heating as well.

[0163] (1) The Joule heating effect produced by induced current from a primary coil

[0164] An induced current (I) from the primary circuit running in a closed loop of the above secondary circuit during the period of time (t) there is a voltage drop resulting in the conversion of electrical energy into heat energy (according to Joule-Lenz law), called as the first Joule heating effect produced by an induced current. A thermal energy (Q) is determined by an equation Q = R. I2, t, wherein R is a resistance of the material that conducts electric current.

[0165] Due to the components which form the secondary circuit, in particular the secondary inductive frame, the welding tip conducting pipes, the welding tip clamping pipes, and the welding tip, are made from highly conductive material, that is very small in resistance, so the heat Q generated has a low proportion, estimated to be about 15% or less of the total heat of the entire of the secondary circuit unit including the welding tip. The heat generated by this effect does not depend on frequency of the current of the magnetic resonance heating device, thus not reducing energy efficiency when using high oscillation frequencies, for example 20Khz or greater.

[0166] (2) The Joule heating effect produced by an eddy / Foucault current Thanks to a special structure of the heating unit / a primary circuit unit and related components, for example the welding tip, the components which include the secondary inductive frame, the welding tip conducting pipes, the welding tip clamping pipes are strong electrical conductor and weak or very poor magnetic conductor. While the object to be heated, for example the welding tip has the properties of both strong electrical conductivity and strong magnetic conductivity. Therefore, at the position of the welding tip, an induced magnetic field will appear, this induced magnetic field will generate eddy currents (Foucault current); and thus, according to Joule's law, the second Joule heating effect is produced by the Eddy current, resulting in the welding tip is to be additional heated significantly.

[0167] As for the welding tip, the heat generated by this effect is estimated to account for about 35% of the total heat of the entire of the secondary circuit unit including the welding tip end. As for the operating frequency of the tin welding machine, the higher the magnetic field, the stronger the effect, the more effective this heating effect is, and therefore the more heat generated. Therefore, using an operating frequency of 20Khz or greater is quite important.

[0168] (3) Thermal effect produced by Magnetic Hysteresis

[0169] Hysteresis occurs in magnetic metals (or magnetic conductor), as for that, a varying magnetic field will rotate and rearrange the adjacent dipole magnetic moments in the metal surface in the direction of the varying magnetic field, generate frictions and generate heat. The heat generated by this effect accounts for a high proportion of about 50% of the total heat of the entire of the secondary circuit unit including the welding tip end. When the operating frequency of the tin welding machine is higher, the magnetic field is stronger, then this thermal effect, called the third thermal effect, generated by the hysteresis phenomenon is stronger, and therefore the heat generated is greater.

[0170] Furthermore, due to the structure folded into two branches of the welding tip, thus at the position of the welding tip end, the magnetic fields of the two metal branches still interact very strongly, making the temperature here always the highest. This also increases energy efficiency due to the welding operation, the welding tip end (top) is the only location that requires the most concentrated, fast and strong heat.

[0171] Stable heating temperature The welding tip end heated rapidly by the action of the three thermal effects mentioned above. However, depending on the material of the welding tip, when the Curie temperature of the material is reached the welding tip will lose magnetism. At that point, the second and third thermal effects will no longer exist, while the first thermal effect will have no significant impact on the temperature increase. Therefore, the temperature of the welding tip especially the welding tip end (top) will stabilize around the Curie temperature of the material being manufactured.

[0172] As for the welding tip is made from nickel the temperature will stabilize around 380°C, the welding tip is made from steel with carbon the temperature will stabilize around 770°C, due to the Curie temperature of nickel is 380°C and the Curie temperature of steel with carbon is 770°C. These temperatures are supposed to be the ideal temperatures for melting common solders such as tin, lead, or leaded tin.

[0173] It should be understood that, although the rapid heating and stable heating temperature characteristics described above, may be intended or related to the tin welding machine, however person skilled in the art understood that the characteristics of rapid heating and stable heating temperature (e.g. at a heating member) may be applied to any heating device used in any technical field, with a heating member made of materials of any suitable temperature and structural properties, without any limitation.

[0174] According to the above descriptions, it can be seen that, with the structure and characteristics described above the magnetic resonance heating device provided by the present invention not only achieve the effects mentioned above, but also achieve additional effects or those mentioned below.

[0175] Energy efficiency

[0176] With design and operation of the magnetic resonance heating device, for example as a tin welding machine other devices, electricity consuming only when the switch is pressed, may save electricity significantly. The operation of the tin welding machine is basically in a resonant state, so the energy conversion efficiency is optimized, helping to save a significant amount of electricity. The welding tip has a design that helps heat concentrate more at the welding tip end, is the most important position needed to melt solder materials such as tin and lead, helping to save electricity significantly. Based on the material chosen for the welding tip, when the Curie temperature is reached, the welding tip will lose magnetism, no longer conduct magnetism, not only does it help stabilize the temperature, but it also reduces the power consumption.

[0177] Other efficiencies

[0178] The heating time is very fast, for example in an actual testing it takes about 1 second from a cool state until the welding tip reaches the required melting temperature for tin / lead.

[0179] Due to the magnetic resonance heating device, for example the tin welding machine works in in resonance state, so the operating efficiency is very high, reducing heat dissipation of internal power electronic elements, allows for extended continuous operating time, and so it becomes easier to increase to a higher power level.

[0180] The LED lights work by electric induction so it is stable, durable, and can create strong light intensity for better lighting.

[0181] Avoid the risk of electrical leakage to the outside.

[0182] The input power source is low voltage DC, also a factor that enhances safety.

[0183] Capable of optimization the structure of the device.

[0184] In addition, the magnetic resonance heating device according to the present invention be designed for apply in many battery-powered hand tools (Cordless form), compact, very flexible to use and portable. Because it uses low voltage DC through a power converter, it is very safe for users. These devices can achieve very fast heating times, for example only Is to a few seconds to reach the required temperature.

[0185] Although some embodiments have been described herein, and may accompanying with alternative or equivalent embodiments or specific exemplarily embodiment, using suitable descriptive terms and technical terms for person skilled in the art may understand and pertain the present invention. Therefore, the person skilled in the art may obviously implement modifications, equivalent arrangements, or variations based on the described embodiments. Therefore, all these modifications, equivalents, or variations fall within the protection scope of the claims appended, and the scope of the protection of the present invention is obviously not limited to contents and descripted embodiments but is defined in the following claims.

Claims

What is claimed is1. A magnetic resonance heating device comprising: a resonant circuit includes main components are an inductor and a capacitor for generating a predetermined resonant frequency; a power switching circuit includes two switching channels capable of high frequency switching and operates on the principle of a push-pull oscillator circuit or a multivibrator circuit, wherein said two switching channels perform open and close alternately at an increasing switching frequency when combined with the resonant circuit to stabilize the switching frequency at the resonant frequency of the resonant circuit; a transformer core made from a strong magnetic material; a coil is provided as a form of a primary coil both acts as the inductor of the resonant circuit, and is wound around the transformer core for forming a primary circuit unit, so that when a varying current flows through said primary circuit unit generating a magnetic field that varies according to the frequency of the resonant circuit in the transformer core; a secondary circuit unit includes a secondary inductive frame, a first interconnection assembly, a second interconnection assembly, and a heating member, wherein: a frame is provided as the secondary inductive frame is an open frame made from a strong electrical conductivity and poor magnetic conductivity material, and having a first frame connection end and a second frame connection end are arranged at a distance for forming an open part of the secondary inductive frame, wherein said secondary inductive frame is curved from the first frame connection end, pass through the transformer core, to the second frame connection end so that when there is a varying magnetic field in the transformer core will produce an electric induction by the secondary inductive frame; the heating member is made from a strong electrical conductivity and strong magnetic conductivity material, and having a first heating member connection end anda second heating member connection end; a first interconnection assembly electrical and mechanical connects between the first heating member connection end and the first frame connection end, a second interconnection assembly electrical and mechanical connects between the second heating member connection end and the second frame connection end, wherein the secondary inductive frame, the first interconnection assembly, the second interconnection assembly, and the heating member are electrically interconnected and forming a closed circuit loop, when there is a varying magnetic field in the transformer core will produce an electric induction by the secondary inductive frame and generating an inductive current flows through the heating member and producing heat at said heating member, wherein the secondary inductive frame, the first interconnection assembly, the second interconnection assembly, and the heating member are mechanically interconnected and forming a structural unit, said structural unit forming said closed circuit loop capable of withstanding a high intensity and frequency current, and when any component of the secondary inductive frame, the first interconnection assembly, the second interconnection assembly, and the heating member is fixed in the magnetic resonance heating device will result in the entire of the secondary circuit unit be held in a fixed position.

2. The device according to claim 1, wherein the secondary inductive frame is made from copper or copper-based materials, in a form of a flat bar is bent into an U-shaped.

3. The device according to claim 1 or 2, wherein the transformer core is in a ring-shaped and made from ferrite, sendust, or ferromagnetic powder.

4. The device according to any one of claims 1 to 3, wherein the primary circuit unit only includes said primary coil wound around the transformer core.

5. The device according to any one of claims 1 to 4, wherein the power switching circuit uses high frequency switching electronic components, including but not limited to, MOSFET, IGBT, and Field Effect Transistors.

6. The device according to any one of claims 1 to 5, wherein said device is a tin welding machine, and the heating member is made from nickel, steel with a carbon content is inthe range of 0,6% to 1,7%, or similar materials.

7. The device according to claim 6, wherein said device further includes an inductive LED unit, said inductive LED unit includes an inductive support with built-in inductive coils, and LED lights are electrically connected to the inductive coils, wherein the inductive support is appropriately arranged with said secondary circuit unit, so that when there is a current flowing in the secondary circuit unit will produce an induced current flowing in the inductive coils of the inductive LED unit and supply power for the LED lights illuminate.

8. The device according to claim 7, wherein, the inductive support is a robust heat- resistant glue unit with built-in inductive coils placed inside the inductive support while the inductive support is molded and not yet cured.

9. The device according to any one of claims 6 to 8, wherein the heating member is a welding tip is made from a metal wire or a bent cylindrical metal rod for forming a welding tip end at the bent position, and the first and second heating members are ends of said metal wire or cylindrical metal rod.

10. The device according to claim 9, wherein each of the first and second interconnection assemblies includes a welding tip conducting pipe and a welding tip clamping pipe, wherein the welding tip clamping pipe has one end in a form of a collet, and one further end has a groove to fit the first frame connection end or the second frame connection end of the secondary inductive frame which is in a form of a flat bar is bent into an U-shaped.

11. The device according to claim 10, wherein the inductive support has a first through hole and a second through hole for inserting through the welding tip clamping pipes for mounting and fixing the inductive support.

12. A magnetic resonance heating device comprising: a resonant circuit includes main components are an inductor and a capacitor for generating a predetermined resonant frequency; a power switching circuit includes two switching channels capable of high frequency switching and operates on the principle of a push-pull oscillator circuit or a multivibrator circuit,wherein said two switching channels perform open and close alternately at an increasing switching frequency when combined with the resonant circuit to stabilize the switching frequency at the resonant frequency of the resonant circuit; at least one coil is provided as a form of a power coil acts as the inductor of the resonant circuit, so that generating a magnetic field that varies according to the frequency of the resonant circuit at said power coil to convert electromagnetic energy into thermal energy at an object to be heated located in the vicinity of the power coil; a frame includes a first frame part and a second frame part made from a strong electrical conductivity material; a first interconnection assembly is connected to the first frame part; and a second interconnection assembly is connected to the second frame part; wherein: the inductor of the resonant circuit is connected between the first interconnection assembly and the second interconnection assembly, and the capacitor of the resonant circuit is connected between a first frame part and a second frame part, for forming a closed circuit loop capable of withstanding a high intensity and frequency current.

13. The device according to claim 12, wherein the power coil is provided by bending electrical wires into a spring shape to obtain a spring power coil.

14. The device according to claim 13, wherein the object to be heated is in a cylindrical shape made from magnetic materials, is arranged of placed into a hollow inside space of the spring power coil to be heated through the conversion of electromagnetic energy into thermal energy.

15. The device according to claim 14, wherein the object to be heated is in a hollow cylindrical shape to contain matters or raw materials need to be heated inside said object to be heated.

16. The device according to claim 15, wherein said matters or raw materials are water, plastic, or material to be melted.

17. The device according to claim 12, wherein the power coil is provided by bending electrical wires into plurality of rounds on one or more planes for heating for an objectto be heated with a flat surface made from magnetic materials when said flat surface is arranged or placed in the vicinity of the power coil. 1 8 . The device according to chim 12, wherein said device forther includes an open ring- shaped core partially cut to form a gap, and wherein the power coil is wound around the open ring-shaped core, and an .object to be heated is made from a non-magrtetle metal is arranged or put in the gap to be heated.

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