Portable efficient induction heating device

Abstract

The utility model discloses a portable efficient induction heating device. According to the scheme, the device comprises a machine body shell body, and a machine body switch and a power line are arranged on one side of the machine body shell body; the other side of the machine body shell body is provided with an output induction coil which is connected through a flexible cable; a handle and a switch are arranged between the output induction coil and the flexible cable; a circuit board is arranged in the machine body shell body; an electromagnetic isolation circuit, a rectification filter circuit, a control circuit, a power supply circuit and a power amplification circuit are sequentially arranged in the circuit board; quick and reliable replacement can be achieved, and the device can adapt to workpieces in various states and is efficient and convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of induction heating, and particularly relates to a portable and efficient induction heating device. Background Art

[0002] At present, the induction heating devices commonly used in the market are usually a compact whole, and the device to be heated needs to be placed into a fixed induction coil. Although some use a hand-held and movable induction heating head, the main body is huge in volume, weighing hundreds of kilograms or even several hundred kilograms, and is very power-consuming. For example, it consumes 20 Kw, but the output power is not large, only about 3 Kw, and the efficiency is only about 15%. For the heated object that is inconvenient or unable to move, it is inconvenient or powerless. The fundamental reason for this inconvenience is that at the output end of the electromagnetic induction heating device, there is a principle in load matching, that is, the output coil should be as close as possible to the power amplification device in order to have a relatively high electromagnetic conversion efficiency. However, because the movable induction heating output end uses a flexible cable, the coil is far from the power amplifier, and the parameters will change timely, which is not conducive to efficient output.

[0003] That is to say, most of the induction coils of the existing induction heating devices are fixed, such as induction cookers or high-frequency and medium-frequency quenching furnaces, and must be as close as possible to the power tube to improve the electromagnetic induction conversion efficiency.

[0004] Therefore, in view of the above technical problems and defects, it is urgent to design and develop a portable and efficient induction heating device. Content of the Utility Model

[0005] The purpose of the utility model is to provide a portable and efficient induction heating device;

[0006] The purpose of the utility model is achieved as follows: the device includes a body shell main body, on one side of the body shell main body, a body switch and a power cord are respectively arranged; on the other side of the body shell main body, an output induction coil is arranged and connected through a flexible cable; a handle and a switch are arranged between the output induction coil and the flexible cable; a circuit board is arranged inside the body shell main body.

[0007] In the circuit board, an electromagnetic isolation circuit, a rectifier filter circuit, a control circuit, a power supply circuit and a power amplification circuit are sequentially arranged.

[0008] Further, a third inductor is arranged in the electromagnetic isolation circuit, a first pin of the third inductor is respectively connected to one end of a third capacitor and one end of a second varistor; a second pin of the third inductor is respectively connected to the other end of the third capacitor and the other end of the second varistor;

[0009] The third pin of the third inductor is connected to one end of the first inductor; the other end of the first inductor is respectively connected to one end of the second capacitor, one end of the first varistor, the anode of the twelfth diode, one end of the first capacitor, and the rectifier filter circuit;

[0010] The fourth pin of the third inductor is connected to one end of the fourth inductor; the other end of the fourth inductor is respectively connected to the other end of the second capacitor, the other end of the first varistor, the cathode of the twelfth diode, one end of the fourth capacitor, and the rectifier filter circuit.

[0011] Further, a first control chip is provided in the rectifier filter circuit;

[0012] The fourth pin of the first control chip is respectively connected to the positive electrode of the sixth capacitor, one end of the seventh capacitor, one end of the third resistor, and one end of the second inductor; the other end of the second inductor is connected to the power amplifier circuit; the negative electrode of the sixth capacitor, the other end of the seventh capacitor, and the other end of the third resistor are commonly connected to the auxiliary power supply circuit.

[0013] Further, a seventh control chip is provided in the rectifier filter circuit;

[0014] The sixth pin of the seventh control chip is connected to one end of the thirteenth resistor; the other end of the thirteenth resistor is connected to one end of the eighth inductor; the other end of the eighth inductor is connected to the third control chip in the auxiliary power supply circuit;

[0015] The seventh pin of the seventh control chip is respectively connected to one end of the sixth resistor and the negative electrode of the fourth diode; the other end of the sixth resistor is respectively connected to the positive electrode of the fourth diode, the negative electrode of the fifth diode, and the gate of the first MOS transistor; the drain of the first MOS transistor is respectively connected to one end of the tenth capacitor, one end of the ninth capacitor, and one end of the thirty-first resistor.

[0016] Further, the model of the seventh control chip is 2N8523.

[0017] Further, a third control chip is provided in the auxiliary power supply circuit; the fourth pin of the third control chip is respectively connected to one end of the sixth inductor, the fifth pin of the third control chip, and the power amplifier circuit;

[0018] The other end of the sixth inductor is connected to one end of the fifth resistor; the other end of the fifth resistor is respectively connected to one end of the eleventh capacitor and the second control chip;

[0019] The ground terminal of the second control chip, the other end of the eleventh capacitor, and one end of the thirteenth capacitor are commonly grounded.

[0020] Further, the model of the third control chip is MCP16301T. Further, the model of the second control chip is LM7812.

[0021] Further, a fifth control chip is provided in the control circuit;

[0022] The twenty-fifth pin of the fifth control chip is connected to the second pin of the sixth linear optocoupler; the twenty-second pin of the fifth control chip is connected to the third pin of the fourth linear optocoupler;

[0023] The third pin of the sixth linear optocoupler is connected to one end of the twentieth resistor; the other end of the twentieth resistor is connected to the gate of the third MOS transistor; the source of the third MOS transistor is connected to the first cooling fan.

[0024] Further, the model of the fifth control chip is STC8H3K64S4 / LQFP32; the models of the fourth linear optocoupler and the sixth linear optocoupler are PC817.

[0025] The device of the present utility model includes a body shell body. A body switch and a power cord are respectively arranged on one side of the body shell body; an output induction coil is arranged on the other side of the body shell body and is connected by a flexible cable; a handle and a switch are arranged between the output induction coil and the flexible cable; a circuit board is arranged inside the body shell body; an electromagnetic isolation circuit, a rectification and filtering circuit, a control circuit, a power supply circuit and a power amplification circuit are sequentially arranged on the circuit board; it can achieve quick and reliable replacement, can adapt to workpieces in various states, and is efficient and convenient.

[0026] That is to say, through the device of this solution, a special flexible cable is used to lead out the induction coil, and specific frequency and secondary resonance technology are adopted. On the premise of higher conversion efficiency, while the handheld induction heating coil can be flexibly moved and easily close to the workpiece to be heated, the single-chip microcomputer collects the loop parameters and adjusts the frequency and pulse width in a timely manner, so that the output end loop is matched in a timely manner, and the infrared temperature measurement method is adopted to measure and control the workpiece temperature at any time to ensure the unity of the heating process. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings;

[0028] Figure 1 It is a schematic structural diagram of a portable and efficient induction heating device of the present utility model;

[0029] Figure 2 It is a schematic diagram of the physical product of a portable and efficient induction heating device of the present utility model;

[0030] Figure 3 It is a schematic diagram of the functional circuit of a portable and efficient induction heating device of the present utility model;

[0031] In the figure:

[0032] 1 - Power cord; 2 - Body switch; 3 - Electromagnetic isolation circuit; 4 - Control circuit and power supply; 5 - Power amplification circuit; 6 - Flexible cable; 7 - Portable plastic shell; 8 - Rectifier filter circuit; 9 - Circuit board inside the shell; 10 - Handle and switch; 11 - Output induction coil.

[0033] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0034] For a better understanding of the purpose, technical solution and advantages of the present utility model, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0035] The present utility model can also be implemented or applied through other different specific examples. The details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0036] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Secondly, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those skilled in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0038] The present utility model will be further described below in conjunction with the accompanying drawings.

[0039] As Figures 1-3 shown, the present utility model provides a portable and efficient induction heating device, which includes a body shell body. On one side of the body shell body, a body switch and a power cord are respectively arranged; on the other side of the body shell body, an output induction coil is arranged and connected through a flexible cable; between the output induction coil and the flexible cable, a handle and a switch are arranged; a circuit board is arranged inside the body shell body;

[0040] In the circuit board, an electromagnetic isolation circuit, a rectification and filtering circuit, a control circuit, a power supply circuit and a power amplification circuit are sequentially arranged.

[0041] In the electromagnetic isolation circuit, a third inductor is arranged. The first pin of the third inductor is respectively connected to one end of a third capacitor and one end of a second varistor; the second pin of the third inductor is respectively connected to the other end of the third capacitor and the other end of the second varistor;

[0042] The third pin of the third inductor is connected to one end of a first inductor; the other end of the first inductor is respectively connected to one end of a second capacitor, one end of a first varistor, the anode of a twelfth diode, one end of a first capacitor, and the rectification and filtering circuit;

[0043] The fourth pin of the third inductor is connected to one end of a fourth inductor; the other end of the fourth inductor is respectively connected to the other end of the second capacitor, the other end of the first varistor, the cathode of the twelfth diode, one end of a fourth capacitor, and the rectification and filtering circuit.

[0044] In the rectification and filtering circuit, a first control chip is arranged;

[0045] The fourth pin of the first control chip is respectively connected to the positive electrode of a sixth capacitor, one end of a seventh capacitor, one end of a third resistor, and one end of a second inductor; the other end of the second inductor is connected to the power amplification circuit; the negative electrode of the sixth capacitor and the other end of the seventh capacitor and the other end of the third resistor are jointly connected to the auxiliary power supply circuit.

[0046] In the rectification and filtering circuit, a seventh control chip is arranged; the sixth pin of the seventh control chip is connected to one end of a thirteenth resistor; the other end of the thirteenth resistor is connected to one end of an eighth inductor; the other end of the eighth inductor is connected to a third control chip in the auxiliary power supply circuit;

[0047] The seventh pin of the seventh control chip is respectively connected to one end of the sixth resistor and the cathode of the fourth diode; the other end of the sixth resistor is respectively connected to the anode of the fourth diode, the cathode of the fifth diode, and the gate of the first MOS transistor; the drain of the first MOS transistor is respectively connected to one end of the tenth capacitor, one end of the ninth capacitor, and one end of the thirty-first resistor.

[0048] The model of the seventh control chip is 2N8523.

[0049] A third control chip is provided in the auxiliary power supply circuit; the fourth pin of the third control chip is respectively connected to one end of the sixth inductor, the fifth pin of the third control chip, and the power amplification circuit;

[0050] The other end of the sixth inductor is connected to one end of the fifth resistor; the other end of the fifth resistor is respectively connected to one end of the eleventh capacitor and the second control chip;

[0051] The ground terminal of the second control chip, the other end of the eleventh capacitor, and one end of the thirteenth capacitor are grounded together.

[0052] The model of the third control chip is MCP16301T. The model of the second control chip is LM7812.

[0053] A fifth control chip is provided in the control circuit;

[0054] The twenty-fifth pin of the fifth control chip is connected to the second pin of the sixth linear optocoupler; the twenty-second pin of the fifth control chip is connected to the third pin of the fourth linear optocoupler;

[0055] The third pin of the sixth linear optocoupler is connected to one end of the twentieth resistor; the other end of the twentieth resistor is connected to the gate of the third MOS transistor; the source of the third MOS transistor is connected to the first cooling fan.

[0056] The model of the fifth control chip is STC8H3K64S4 / LQFP32; the models of the fourth linear optocoupler and the sixth linear optocoupler are PC817.

[0057] Specifically, in a specific embodiment of the solution of the present invention, a portable and efficient induction heating device is provided; the working principle and process are as follows: The AC220V mains power passes through a multi-stage electromagnetic isolation circuit to isolate the interference sources of the power supply from entering the local circuit, and at the same time isolate the interference caused by the local circuit to the power supply. Then it enters the silicon stack rectification and is filtered by components such as inductors and capacitors to obtain DC311V direct current.

[0058] The direct current is divided into two paths. One path is converted into DC15V by a low-power switching power supply for the control circuit. For low-voltage chips, the machine uses integrated voltage regulator chips such as LM7805 to convert it into a suitable voltage. The other path leads to the collector and emitter of the IGBT power transistor and is used as the power amplification power supply.

[0059] In the control circuit, the single-chip microcomputer generates a PWM square wave with a specific frequency according to the characteristics of the output circuit. After shaping and amplification, it is loaded onto the control gate of the power transistor IGBT, so as to obtain a high-frequency sine wave with a suitable power at the output port. This output port is connected to the output coil through a special soft cable to form a secondary resonance circuit. At the same time, the single-chip microcomputer continuously measures the parameters of the secondary resonance circuit through the monitoring circuit and micro-adjusts the frequency and pulse width as needed to achieve the best matching. Finally, the output coil converts electrical energy into alternating magnetic energy and transfers it to the workpiece.

[0060] The schematic diagram of the product of the present utility model is shown in Figure 1 , and it consists of the following parts, in sequence: the power cord and the body switch, the portable plastic shell, the circuit board inside the shell (the circuit board is divided into four parts according to functions: the electromagnetic isolation circuit, the rectification and filtering circuit, the control circuit and the power supply, the power amplification circuit), the secondary resonance soft cable, the handle switch, and the output induction coil. The connection relationship between them is shown in the attached drawing. The physical picture is as attached Figure 2 shown.

[0061] Preferably, the 220V AC mains passes through a multi-stage electromagnetic isolation circuit to isolate the interference sources of the power supply from entering the machine circuit, and at the same time isolate the interference caused by the machine to the power supply. Then it enters the silicon stack rectification and is filtered by components such as inductors and capacitors to obtain DC311V direct current.

[0062] The direct current is divided into two paths. One path is converted into DC15V by a low-power switching power supply for the control circuit. For low-voltage chips, the machine uses integrated voltage regulator chips such as LM7805 to convert it into a suitable voltage. The other path leads to the collector and emitter of the IGBT power transistor and is used as the power amplification power supply.

[0063] In the control circuit of the machine, the single-chip microcomputer is the core component. In cooperation with the hardware circuit, the machine is provided with a variety of protection measures, such as over-current protection function, over-temperature protection function, etc. At the same time, the single-chip microcomputer continuously monitors the parameters of the output circuit and generates a PWM square wave with a specific frequency accordingly. After shaping and amplification, it is loaded onto the control gate of the power transistor IGBT, so as to obtain a high-frequency sine wave with a suitable power at the output port.

[0064] The output port is connected to the output coil through a special soft cable (the wire diameter, winding method, length, and dynamic parameters of the soft cable must be strictly matched, otherwise the output efficiency will be seriously affected), forming a secondary resonance circuit. At the same time, the single-chip microcomputer continuously measures the parameters of the secondary resonance circuit through the monitoring circuit and micro-adjusts the frequency and pulse width as needed to achieve the best matching. Finally, the output coil converts electrical energy into alternating magnetic energy and transfers it to the workpiece.

[0065] The product of the present utility model adopts a backpack portable plastic shell design, which can operate conveniently and flexibly. The output coil can be conveniently moved under the premise of high output efficiency to heat workpieces that cannot be moved or are inconvenient to move, and infrared temperature measurement is carried out to ensure the process effect. For example, in industries such as truck maintenance, when encountering rusty screws, the traditional method is to repeatedly heat and cool with an oxyacetylene flame. Equipping an oxyacetylene flame not only requires prior safety procedures, but also requires cylinders, gas pipes, torches, etc., and at the same time requires trained professionals to operate. In today's highly competitive industries, this situation greatly increases costs. The appearance of this product can conveniently solve these high costs. Only a portable induction heater and an operator are needed. The operator only needs to look at the instruction manual and can learn to operate in five minutes. It is truly easy to learn, safe, convenient, efficient, fast, and flexible and versatile.

[0066] The circuit board inside the shell is divided into four parts according to functions: electromagnetic isolation circuit, rectifier filter circuit, control circuit and power supply, and power amplification circuit. It cooperates with the soft cable of the secondary resonance to provide high-efficiency output.

[0067] The pistol-type handle design, combined with the host working status indicator light designed on the handle, makes the operation handy and the machine status clear at a glance.

[0068] It is equipped with a variety of output coils and can be replaced quickly and reliably, and can adapt to workpieces in various states, which is efficient and convenient.

[0069] The device of the present utility model includes a body shell body. One side of the body shell body is respectively provided with a body switch and a power cord; the other side of the body shell body is provided with an output induction coil connected by a soft cable; a handle and a switch are arranged between the output induction coil and the soft cable; a circuit board is arranged inside the body shell body; an electromagnetic isolation circuit, a rectifier filter circuit, a control circuit and a power supply circuit, and a power amplification circuit are sequentially arranged in the circuit board; it can be replaced quickly and reliably, can adapt to workpieces in various states, and is efficient and convenient.

[0070] That is to say, by using a special soft cable to lead out the induction coil in the device of this solution and adopting a specific frequency and secondary resonance technology, on the premise of relatively high conversion efficiency, while the hand-held induction heating coil can be flexibly moved and easily close to the workpiece to be heated, the single-chip microcomputer collects the loop parameters and adjusts the frequency and pulse width in a timely manner, so that the output end loop is matched in a timely manner, and the infrared temperature measurement method can be used to measure and control the workpiece temperature at any time to ensure the unity of the heating process.

[0071] In other words, the product of the present utility model has the characteristics of high efficiency, portability and flexibility. The soft cable used is a special product, and its structure and parameters can be well matched with this machine. The single-chip microcomputer in the product of this solution continuously measures, calculates and adjusts the parameters of the front stage by continuously measuring the characteristics of the output end, so that the whole machine works efficiently. The product adopts a pistol-shaped handle, and a host working status indicator or display is set at the hand-held end, making the operation more convenient, with one-key operation and clear at a glance. The circuit control part of this machine is provided with multiple protections such as the whole plastic shell insulation of the host, frequency stability, overcurrent, overheat, and grounding of the output end, which can effectively guarantee the safety of the equipment and personnel.

[0072] The above-described embodiments only represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A portable and highly efficient induction heating device, the device comprising a body shell body, on one side of the body shell body are respectively provided with a body switch and a power cord; on the other side of the body shell body is provided with an output induction coil connected by a flexible cable; between the output induction coil and the flexible cable is provided a handle and a switch; characterized in that, A circuit board is arranged inside the fuselage shell. An electromagnetic isolation circuit, a rectification and filtering circuit, a control circuit, a power supply circuit and a power amplification circuit are sequentially arranged on the circuit board.

2. The portable and highly efficient induction heating device according to claim 1, characterized in that, A third inductor is arranged in the electromagnetic isolation circuit. One end of the first pin of the third inductor is respectively connected to one end of a third capacitor and one end of a second varistor; the other end of the second pin of the third inductor is respectively connected to the other end of the third capacitor and the other end of the second varistor. The third pin of the third inductor is connected to one end of a first inductor; the other end of the first inductor is respectively connected to one end of a second capacitor, one end of a first varistor, the anode of a twelfth diode, one end of a first capacitor and the rectification and filtering circuit. The fourth pin of the third inductor is connected to one end of a fourth inductor; the other end of the fourth inductor is respectively connected to the other end of the second capacitor, the other end of the first varistor, the cathode of the twelfth diode, one end of a fourth capacitor and the rectification and filtering circuit.

3. A portable high-efficiency induction heating device according to claim 1 or 2, characterized in that, A first control chip is arranged in the rectification and filtering circuit. The fourth pin of the first control chip is respectively connected to the positive electrode of a sixth capacitor, one end of a seventh capacitor, one end of a third resistor and one end of a second inductor; the other end of the second inductor is connected to the power amplification circuit; the negative electrode of the sixth capacitor and the other end of the seventh capacitor and the other end of the third resistor are jointly connected to the auxiliary power supply circuit.

4. A portable and highly efficient induction heating device according to claim 3, wherein, A seventh control chip is arranged in the rectification and filtering circuit. The sixth pin of the seventh control chip is connected to one end of a thirteenth resistor; the other end of the thirteenth resistor is connected to one end of an eighth inductor; the other end of the eighth inductor is connected to a third control chip in the auxiliary power supply circuit. The seventh pin of the seventh control chip is respectively connected to one end of a sixth resistor and the negative electrode of a fourth diode; the other end of the sixth resistor is respectively connected to the positive electrode of the fourth diode, the negative electrode of a fifth diode and the gate of a first MOS transistor; the drain of the first MOS transistor is respectively connected to one end of a tenth capacitor, one end of a ninth capacitor and one end of a thirty-first resistor.

5. A portable and highly efficient induction heating device according to claim 4, characterized in that, The model of the seventh control chip is 2N8523.

6. A portable and highly efficient induction heating device according to claim 3, characterized in that A third control chip is arranged in the auxiliary power supply circuit. The fourth pin of the third control chip is respectively connected to one end of a sixth inductor, the fifth pin of the third control chip and the power amplification circuit. The other end of the sixth inductor is connected to one end of a fifth resistor; the other end of the fifth resistor is respectively connected to one end of an eleventh capacitor and a second control chip. The ground terminal of the second control chip, the other end of the eleventh capacitor and one end of a thirteenth capacitor are jointly grounded.

7. A portable high-efficiency induction heating device according to claim 4 or 6, characterized in that The model of the third control chip is MCP16301T.

8. A portable high-efficiency induction heating device according to claim 6, wherein, The model of the second control chip is LM7812.

9. A portable and highly efficient induction heating device according to claim 1, characterized in that, A fifth control chip is arranged in the control circuit. The twenty-fifth pin of the fifth control chip is connected to the second pin of a sixth linear optocoupler; the twenty-second pin of the fifth control chip is connected to the third pin of a fourth linear optocoupler. The third pin of the sixth linear optocoupler is connected to one end of the twentieth resistor; the other end of the twentieth resistor is connected to the gate of the third MOS transistor; the source of the third MOS transistor is connected to the first cooling fan.

10. A portable and highly efficient induction heating device according to claim 9, characterized in that, The model of the fifth control chip is STC8H3K64S4 / LQFP32; The models of the fourth linear optocoupler and the sixth linear optocoupler are PC817.

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