KR101960883B1 - A analog type auto control radio frequency resonance hitting device - Google Patents

Abstract

The present invention relates to an analog automatic control type high frequency resonance induction heating apparatus which heats a metal object of relatively small size, which is fixed and disassembled or disassembled, by a protruding induction coil in a short time.
According to the present invention, a circuit is constituted such that the time constant of an oscillation circuit is changed by gradually changing the brightness of an LED element when a user operates a switch (SW), thereby varying the high frequency output frequency of the oscillation circuit within a predetermined frequency range, The frequency of the high frequency output of the work coil is raised to the resonance frequency by raising the high frequency output of the work coil, and then the oscillation frequency of the oscillation circuit is fixed, so that the metal load object is rapidly heated. In addition, during high-frequency heating, the feedback signal obtained from the feedback extraction circuit enables the circuit to actively respond to real-time response to overcurrent flows such as current congestion caused by changes in reactance due to heat generation of the heated load object, The frequency is varied so as to maintain the maximum resonance frequency even when the reactance at the output end of the work coil changes, for example, the heating of the load object or change in the contacted distance. Further, from the state where the oscillation frequency is fixed at the time of occurrence of the overcurrent, Frequency oscillation frequency is varied by adjusting the time constant of the frequency so that the oscillation frequency is shifted away from the resonance frequency of the work coil side output circuit to reduce the high frequency current or approach the resonance frequency so as to raise the high frequency current Circuit And controls the operation.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an analog automatic control type high frequency resonance induction heating apparatus,

The present invention relates to an analog automatic control type high frequency resonance induction heating apparatus suitable for heating a fixed metal part,

More specifically, the optimum heating condition is quickly maintained in accordance with the condition (size, material, etc.) of the object to be heated, and the oscillation frequency is separated from the resonance frequency on the side of the output end of the work coil by a feedback signal To an analog automatic control type high frequency resonance induction heating apparatus for automatically controlling a high frequency output.

Generally, the bonding sites between metal objects are exposed not only in a poor environment where oxidation and corrosion are likely to occur, such as heat, moisture, salt, and dust, but also when exposed to the atmosphere for a long time. There are many cases where it is not easy to disassemble and disassemble.

Particularly, there are many structures that are fastened by using a screw coupling means such as a bolt or a nut in the coupling between metal objects such as an engine, a frame, and a suspension, for example, in an automobile. Such a metal coupling portion may cause oxidation, corrosion, It becomes very difficult for the worker to disassemble and disassemble it.

In this case, conventionally, a bolt head fixed by a method such as oxygen welding or the like is removed by thermally cutting the bolt fixing part and then drilled to form a new screw hole to remove the remaining fixing part, Sometimes it is necessary to use a bolt with a larger diameter to do the job.

Therefore, there are many cases where damage to the original product body to be fastened is caused, and in particular, many work processes with high difficulty are required as well as a great effort of the worker.

This is a common occurrence in many fields that use various steel structures that require post management such as ships, various facilities, bridges, and buildings as well as automobiles.

In order to disassemble joints which are difficult to dismantle fasteners such as screw type parts or bolts, it is necessary to heat parts The conventional digital type high frequency heating device is a device to which a digital control method using a microprocessor is applied, so that the user can adjust the temperature of the heating device according to the load object (size, material, etc.) There is a problem in that it is difficult to be used easily by a general user because the use method of the digital input must be set according to the conditions of the load object and the heating condition considering the resonance point of the high frequency output every day.

Particularly, it is necessary to apply algorithm-programmed microprocessor logic processing considering various variable conditions such as change of inherent magnetic flux characteristic, contact distance, heating condition, etc. due to change of heating temperature of the object to be heated as well as material and size of the object to be heated The cost of the equipment is high, and in particular, in the event of a failure due to an overcurrent, it is very difficult to repair the fault, or the cost is high.

SUMMARY OF THE INVENTION The present invention, which is devised to solve such conventional problems,

In order to disassemble the bonded metal body, the output frequency is automatically scanned and fixed to the resonance frequency so that the predetermined portion of the metal object can be rapidly heated to the required temperature only by a simple switch operation. At the same time, This is a very simple and easy to use analog automatic controlled high frequency circuit by realizing high frequency heating while coping with the change of reactance of LC resonance caused by LC resonance, And an object of the present invention is to provide a resonance induction heating apparatus.

In addition, the present invention is configured as an analog circuit which can be manufactured at low cost as well as maintenance can be performed for each part without requiring a separate programming operation as in the case of a digital device having a microprocessor, It is possible to automatically detect the resonance point frequency by simply operating the switch and perform the operation of automatically stopping and correcting the frequency during heating so that the operation parameters such as the size and material of the object to be heated, Frequency high-frequency resonance induction heating apparatus which automatically corrects in accordance with an analog proportional control method in correspondence with high-frequency heating, and monitors the overcurrent by itself to stably protect the circuit.

According to an aspect of the present invention,

A combination of a timing acceptance LED element and a CDS element for varying the frequency due to a change in resistance value due to light emission, a closed type operation switch for user's convenience operation, a capacitor for providing a time constant for variable scanning of the oscillation frequency, And an analog circuit composed of a Zener diode and a photocoupler is used as the LED element controlling circuit. By such a circuit configuration, a high frequency is automatically changed by a simple switch operation to scan and fix the resonance frequency, And the feedback signal is applied to the photocoupler over a limited size to emit the light with the analog proportional control light quantity, thereby oscillating the oscillation high frequency using the CDS, and heating the load object by the controlled resonance frequency Depending on the condition, An analog automatic control type high frequency resonance induction heating apparatus capable of automatically correcting high frequency electric power output to a coil to heat a load object safely without worrying about an overcurrent and the like.

In order to achieve the above object,

An oscillation circuit for outputting a high-frequency signal oscillated by oscillating a frequency by a time constant; an amplifying circuit for amplifying the high-frequency signal output from the oscillation circuit in one or more stages; An output terminal connected to the coil for radiating high-frequency current amplified by the amplifier circuit to the work coil; and a capacitor connected in parallel to the work coil and connected to the output terminal so as to be combined as an LC resonant element, Frequency resonance amplified by LC resonance between the capacitor and the work coil to the load body while the work coil is connected to the output terminal, the high frequency resonance induction heating apparatus comprising:

A feedback extraction section provided between the amplification circuit and the output terminal for extracting a feedback signal by extracting a voltage level according to a magnitude of a high frequency current; A photodiode for receiving a driving current as the secondary side of the photocoupler is turned on, and an LED element for emitting light when the secondary side of the photocoupler is turned on; A CDS element for varying the resistance value according to the light emission level of the LED element and varying the time constant of the oscillation circuit by varying the resistance value connected to the input terminal of the oscillation circuit to vary the oscillation frequency of the oscillation circuit; A switch which is turned on / off in accordance with a user's operation in a state where the coupler is turned off so as to turn off / light the LED element, and a switch provided in the ON state of the LED element, And a capacitor for changing the time constant of the oscillation circuit by lowering the light emission level until the light emission level is gradually extinguished;

Wherein the output frequency of the oscillator circuit in the charged state of the capacitor is set in accordance with the LC resonance frequency of the work coil and the capacitor and the output frequency of the oscillator circuit in the charging start state of the capacitor Is set in advance so that the frequency becomes a frequency spaced apart from the LC resonance frequency of the work coil and the capacitor, and the time constant of the oscillation circuit is set to a frequency ranging from a frequency separated from the resonance frequency to the resonance frequency Thereby gradually changing the frequency;

A feedback signal of the feedback extractor is applied to the primary side of the photocoupler so as to vary the light emission level of the LED element in accordance with the current flowing in proportion to the feedback signal applied to the primary side at the secondary side of the turned- And a circuit for controlling the oscillation frequency of the oscillation circuit in an analog manner so as to be closer to or away from the work-coil-side LC resonance frequency, thereby automatically controlling the analog automatic control type high frequency resonance induction heating apparatus.

The present invention having the above-described circuit configuration can be applied to the case of a single-stage amplifying circuit using one half-bridge circuit as the amplifying circuit.

In the above-described configuration of the present invention,

Wherein the oscillation circuit is configured to output a high-frequency oscillation signal at a half-wave period alternating with the upper and lower two channel outputs,

Wherein the amplifying circuit comprises a half bridge circuit for receiving an output of the oscillation circuit and for amplifying and outputting a high frequency to the output terminal,

Wherein the half bridge circuit is configured to perform LC resonance amplification by the upper and lower LC resonance elements connected by the upper and lower channel switching elements in accordance with the output of the oscillation circuit, A primary side coil of an induction coil is used as an inductor in the element and a coil or a conductor 2 made of a conductor for causing a high frequency current induced by a high frequency current flowing to the primary coil of the induction coil to flow to the work coil through the output terminal The present invention can be embodied as an apparatus including a car side. The feedback extractor preferably includes a coil product installed at a rear end of the secondary coil of the induction coil to induce and feed back a high frequency signal at a rear end of the secondary coil of the induction coil.

In the present invention described above, the amplifying circuit can be configured as a multi-stage amplifying circuit composed of two or more half-bridge circuits. In this case, the half-bridge circuit and the induction coil are used as first and second separate components Can be specified. More specifically, the oscillation circuit is configured to output a high-frequency oscillation signal at a half-wave period alternating with an upper and a lower channel output,

Wherein the amplifying circuit comprises: a first half bridge circuit for receiving and amplifying a high frequency output of the oscillation circuit; And a second half bridge circuit for amplifying and outputting a second high frequency from the first half bridge circuit,

The first half bridge circuit includes LC elements L1-C3 and L1-C4 connected to the output terminals of the upper and lower two-channel switching elements Q1 and Q2 to which the output signal of the oscillation circuit is applied, Signal is subjected to primary LC resonance amplification and output to the primary coil of the induction coil, circuitry is used to use the primary coil of the induction coil as the inductor of the primary LC resonance,

The second half bridge circuit is configured to LC-resonantly amplify the high-frequency current applied to the induction coil primary coil by the upper and lower two-channel switching devices Q3 and Q4 input through the secondary coils L2 and L3, LC resonance amplification is performed by the LC elements (L5-C5) and (L5-C6) connected to the second induction coil and output to the primary coil L5 of the second induction coil, The primary side coil L5 of the transformer is used,

And a secondary coil which receives the high-frequency signal resonantly amplified by the second half bridge circuit from the primary coil L5 of the second induction coil, the secondary coil being connected to the output coil through an output terminal removably connected to the work coil And may be configured to have a coil shape or a conductive line shape so as to be electromagnetically conductive with the primary coil L5 of the second induction coil to flow to the work coil.

At this time, the feedback extractor is provided at a rear end of any one of the upper and lower channels (L2 or L3) of the secondary coil of the first induction coil, so that a signal flowing to the rear end of the secondary coil of the first induction coil And a coil product L4 for inducing electromagnetic induction and generating a feedback signal.

In addition to the above-described configurations, in the circuit configuration of the present invention, the Zener diode has a voltage close to the voltage fed back through the feedback extractor in a state where the reverse voltage specification value is close to the resonance frequency of the work coil and the capacitor The photocoupler is operated when the feedback signal exceeds the reverse voltage standard of the Zener diode.

The work coil L7 and the capacitor C7 may have a resonance frequency determined by a desired frequency of several tens to several hundreds of KHz to satisfy the relationship of 1/2 pi√LC so that the inductance and capacitance Configure the values in advance;

The LC resonance frequency of the time constant circuit for determining the oscillation frequency of the oscillation circuit and the LCF of the half bridge circuit is set by presetting the frequency value thereof in accordance with the LC value of the work coil L7 and the capacitor C7.

On the other hand, the present invention constituted as a circuit as described above can be implemented as follows as an external arrangement configuration.

More specifically, a work coil body 200, which is held by a user so as to allow a user to approach a load object and perform a switching operation, and a fixed control body 100 are connected by a wire 44;

The output terminal to which the work coil is connected and the switch SW to be operated by the user are externally exposed to the work coil body 200 and the capacitor C7 and the capacitor C7 are connected to each other An induction coil including the secondary coil and a primary coil L5 for electromagnetic induction to the secondary coil L6 is installed inside and the output terminals 220a and 220b are connected to the output coil The connection ports 210a and 210b for inserting the work coil connection end are used as electrodes to be exposed and unbonded and removed so as to be exposed to the outside;

It is preferable that the control body 100 has a structure in which most of the components other than the components provided in the workpiece coil body 200 are installed inside the body.

In the present invention, both ends of the output terminals 220a and 220b for connecting and supplying the high-frequency current to the work coil are connected to the primary coil of the induction coil, one end of which is connected to the half- The second conductor L5 is used as a second conductor which is arranged to be spaced apart from the wound core 230 and whose other end is spaced apart from the core to induce a high frequency flowing into the primary coil L5 of the induction coil .

The capacitors connected to the first and second conductors are set to match the capacitance values of the LC parallel resonance, and are configured to be subjected to withstand voltage distribution and capacitive coupling by a combination of a plurality of capacitor elements connected in series and in parallel.

In the parallel connection of the capacitors, a third lead for the inter-capacitor series connection is used in addition to the first and second leads for the withstand voltage distribution of the capacitor.

The first, second and third lead wires are made of a copper pipe having a high electrical conductivity and a high thermal conductivity at least a part of the lead wire body. The first and second lead wires are attached to two heat sinks insulated from each other, It is preferable to have a structure capable of dissipating heat at a high temperature according to a high current flow of the heater.

According to the present invention configured as described above, the oscillation frequency of the oscillation circuit is fixed by increasing the high-frequency output while varying the high frequency output from the work coil side to a resonance frequency by a preset period of analog system by the switch operation and reaching the resonance frequency. In the process of varying the oscillation frequency so as to approach the resonance frequency, if the state becomes unstable such as ripple or shock noise, it is not excessive in the range of operating to amplify stable high frequency output in the circuit by the feedback signal detecting the state The oscillation frequency is corrected by a method of approaching or separating the resonance frequency so as to obtain a stable high-frequency output. Therefore, by operating a simple switch depression operation by the user, the high frequency amplified by the resonance frequency is stably operated, So that it can be heated.

An untrained user can easily and easily use the work object, and the work object can be quickly heated at a high temperature in a short time.

Particularly, in the device circuit of the present invention, the oscillation frequency is controlled in real time by controlling the oscillation frequency in real time by monitoring the change of the environment on the side of the work coil side as a safety signal such as a rise in the transient current itself or the like as a feedback signal to the analog input circuit side, The real-time proportional control correction for real-time approaching the object is performed at the frequency of the LC resonance on the work coil side by the proportional control of the analog method. Therefore, it is possible to perform simple proportional control of the user regardless of the size, material, The resonance frequency is automatically scanned only by the switch pressing operation, and the necessary heating operation can be performed quickly and automatically, so that the heating operation can be performed easily and safely.

In addition, the present invention can be manufactured at a low cost by simply configuring an analog circuit that does not require a separate programming operation like conventional digital equipment, and also can perform fault diagnosis and repair for each circuit element. Therefore, So that it can be easily maintained.

In addition, the work coils of different standards can be easily removed and replaced according to the needs of the operator, while the work coils of different standards are automatically scanned with the resonance frequency to automatically fix the frequency, Therefore, even if the material and size of the load object are different, there is no need to use the separate method, which is advantageous in that the user can easily use the equipment.

1 is an overall circuit configuration diagram according to an embodiment of the present invention;
2 is an external perspective view showing an arrangement of the entire device according to the embodiment of the present invention,
FIGS. 3 and 4 are perspective views showing the structures disposed and installed in the workpiece coil body portion, respectively, from the top and the bottom of the structure of the embodiment of the present invention, and FIGS.
Fig. 5 is a circuit diagram for constituting a combination of a capacitor C7 resonating with the work coil shown in Figs. 1 and 3 and Fig.

1, the circuit configuration of the present invention includes:

And an oscillation chip (C1) as an oscillation circuit for oscillating and outputting a high frequency,

And a half bridge circuit for outputting LC resonance amplified signals by the LC elements (C3, L1) (C4, L1) connected to the output terminals of the upper and lower two channel switching elements in accordance with the high frequency oscillation output of the oscillation circuit, (L5) of the induction coil is used as an inductor of the LC resonance element of the half bridge circuit to induce the high frequency current flowing into the primary coil L5 to the secondary coil L6 Frequency current flows to the work coil 30 connected to the final output stage capacitor C7 and the parallel LC resonance circuit so as to heat the metal load object close to the work coil 30.

In this circuit configuration, a feedback extraction section (L4) provided at a position for extracting a high frequency current flowing in the circuit wiring of the half bridge circuit and extracting a feedback signal; A photocoupler (PC1) which is applied to the primary side through the Zener diode (ZD2) and switches the secondary side when the extraction voltage of the extraction unit (L4) becomes a certain level or more; An LED element (LED1) for emitting a drive current in response to the turn-on of the secondary side of the photocoupler (PC1); A CDS element CDS1 whose own resistance varies according to the degree of brightness of the LED element LED1 and is connected to the oscillation circuit IC1 to generate a time constant resistance value of the oscillation frequency; A switch SW connected in parallel to the secondary side of the photocoupler PC1; The secondary side of the photocoupler PC1 is turned off to turn on the brightness of the LED 1 by turning on the switch SW by the operation of the switch SW so that the oscillation frequency of the oscillation circuit unit IC1 is automatically changed And a capacitor C1.

When the output frequency of the oscillation circuit unit IC1 is varied to reach the LC resonance frequency of the final output capacitor C7 and the work coil L7 when the switch SW is operated, The photocoupler PC1 is activated so that the brightness of the LED element LED1 is fixed to stop the variable oscillation frequency and fix the frequency scan, Frequency power at the resonance frequency L7 so as to heat the load object.

In FIG. 1, the capacitor C1 is a capacitor for charging the switch SW when turned off (turned off) to lower the LED brightness. As described above, the oscillation frequency is changed to the resonance frequency at the beginning of the switch operation, Lt; / RTI > The resistor R3 is a time constant accommodating resistor for setting the charging time constant of the capacitor C1 to set the LED brightness decay. The capacitor C8 is a capacitor for setting the oscillation frequency time constant to set the oscillation frequency of the oscillation chip IC1 by configuring the time constant with the CDS element.

The reverse voltage specification value of the zener diode ZD2 should be set in accordance with the voltage level induced by the extraction coil L4 and the voltage level of the photocouplers PC1 and LED1 on / And is a standard of a voltage close to a voltage fed back through the feedback extractor in a state where the reverse voltage specification value of the Zener diode is close to the resonance frequency of the work coil L7 and the capacitor C7, And operates the photocoupler when the signal exceeds the reverse voltage standard of the Zener diode ZD2.

In the present invention configured as described above, the principle of automatically controlling a frequency by an analog method will be described step by step as follows: A); When the equipment is not running,

   - As shown in the circuit of Fig. 1, if the switch SW which is a normally closed type is not operated, the switch is turned on to supply the maximum level voltage to the LED element LED1 to emit light at the full level Then, the resistance value of the CDS element CD1 whose resistance value varies according to the light emission of the LED element is close to '0' ohm, so that the oscillation chip IC1 of the oscillation circuit does not oscillate. In other words, the equipment is not in operation so as not to output high frequency.

B); During heating operation,

   - When the operation switch (SW) is pressed, the switch is turned off, and the capacitor C1 is charged. During charging, the brightness of the LED element LED1 becomes dark, and at the same time, the resistance value of the CDS element CD1 increases, and the oscillation chip IC1 is oscillated to oscillate the oscillation frequency to a predetermined frequency, for example, about 300 KHz to 60 KHz . (If the oscillation frequency is such an oscillation frequency, if the oscillation frequency of the CDS device CD1 to which the oscillation chip IC1 is connected becomes high, if the oscillation frequency is low, a frequency close to 60 KHz is defined as a resonance frequency. The frequency close to 300 KHz is set as the resonance frequency. The setting of the resonance frequency can be determined by a theoretically known LC value in an LC resonance circuit applied to the circuit of the present invention.)

C); Obtaining the desired resonant frequency.

   When the resonance frequency of the capacitor C7 and the inductor L7 is reached while the oscillation frequency is variable in the step B), a voltage exceeding the limit voltage of the Zener diode ZP2 is generated in the coil L4 used as the feedback extracting part. Accordingly, the photo- The brightness of the LED element LED1 is fixed (the oscillation frequency is fixed), and the heating of the load object, which is the object to be heated by the work coil L7, is started.

     At this time. The diameter of the winding coil circumference of the work coil L7, the size of the iron (load object size) which is inserted into the circumference of the winding coil close to the work coil L7, the reactance which changes according to the change in the intrinsic magnetic flux density The resonance frequency is slightly different depending on the change of the resonance frequency. However, the circuit configuration of the present invention automatically controls the desired maximum power (the desired maximum resonance frequency) in a feedback state in which no overcurrent is sensed.

D) When heating is finished.

    When the user desires to terminate heating, when the user depresses the switch-pressing operation, the LED element is turned on and the LED element is turned on at a predetermined maximum amount of light. Thus, the resistance value of the CDS element (CDS1) The oscillation output of the oscillation circuit is limited as described in the operation description of the above paragraph A), so that the high frequency output is not performed.

E) During feedback signals such as overcurrent or peak current generation during heating.

When the operation of the amplifier circuit becomes unstable due to the overcurrent flowing or the heating temperature rises (the inductance becomes small) due to the rise of the heating temperature, a peak voltage such as a shock noise is generated, The resistance value of the CDS element CDS1 becomes low as the brightness of the LED element LED1 becomes high and the oscillation chip of the oscillation circuit IC1) As the input time constant is changed, the output frequency is changed so that the output frequency is output from the oscillation circuit and applied to the half bridge circuit, which is the amplifier circuit, so as to be spaced from the resonance frequency on the work coil side. Analogue control by increasing the output frequency slightly toward the resonance frequency side and raising the output again if it is unstable W & optimum high-frequency power becomes a maximum amplification of the resonance amplifier to be corrected output.

The present invention can be applied variously in addition to the configuration of the present invention which operates as described above,

The circuit configuration of the present invention described above is configured such that the work coil portion 200 of FIG. 1 is separately arranged in the body of FIG. 2, and the entire other controller circuit portion 100 is arranged on the controller body 200 side of FIG. 2 And is connected through the wiring 44 as shown in FIG. 2, so that the worker can freely use only the work coil part body 200, which is relatively small in size, by grasping.

The oscillation chip IC1 alternately outputs 2-channel output signals having a duty ratio of 50% or less. The oscillation chip IC1 preferably uses a device whose oscillation frequency varies according to the time constant. In the circuit of the embodiment, the known IR2153D integrated device is used It is suitable to construct a circuit.

The output terminals of the two switching elements Q1 and Q2 are respectively connected to the capacitors C3 and C2 through the two switching elements Q1 and Q2 with the two channel signals output from the oscillation chip IC1 as inputs. C4 via the primary coil L1 side of the first induction coil (transformer).

In the circuit configuration, the oscillation chip (IC1) that constitutes the oscillation circuit using IR2153D is a oscillation chip with a built-in bootstrap diode. The sixth terminal of the oscillation chip IC1 is grounded and connected to the primary coil L1 of the first induction coil according to the outputs Q1 and Q2 of the first half bridge circuit composed of the switching elements Q1 and Q2 and its peripheral circuits. So that the output signal of the first half bridge circuit is inputted to the second half bridge circuit side through the secondary coils L2 and L3 of the first induction coil.

Referring to the high-frequency waveform output from the oscillation chip IC1, the square wave is outputted from the oscillation chip, and the square wave passes through the switching elements Q1 and Q2 constituting the first half-bridge circuit, C2, and the coil L1, that is, the corner of the square wave changes into a waveform that is rounded like a sinusoidal wave.

In the embodiment of the present invention, the oscillation chip IC1 of the oscillation circuit shown in FIG. 1 is constituted so as to output a high-frequency oscillation signal at a half-wave period alternating with the upper and lower two-channel output terminals, The above-described half bridge circuit portion can be composed of a two-stage amplifier circuit composed of the first half bridge circuit portion and the second half bridge circuit portion. In the case of such a two-stage amplifier circuit,

The first half bridge circuit amplifies the primary LC resonance by the upper and lower 2-channel switching elements in accordance with the oscillation output, and outputs the primary LC resonance amplifier using the primary side of the first induction coil part as the inductor (L1) of the primary LC resonance So that the primary LC resonance amplified high-frequency current is caused to flow through the inductor (L1)

The second half bridge circuit amplifies and outputs the secondary LC resonance by the upper and lower two-channel switching elements according to the signal current induced by the two channels from the secondary coil of the first induction coil part, and outputs the LC resonance inductor L5, So that the secondary LC resonance-amplified high-frequency current flows.

At this time, a high-frequency current flowing in the inductor L5 is induced by using the primary coil L5 of the second induction coil as an LC resonant inductor (LC of L) of the second half bridge circuit, The second induction coil L6 side for obtaining the high-frequency current with the secondary coil L1 is disposed inside the workpiece coil body 200 held by the user as shown in Figs. 2 to 4, If the switch SW is provided so as to be exposed on the work coil body 200, the user can move the work coil L7 to the load object while operating the switch SW.

The final output stage capacitor C7 is directly and parallelly connected to both ends of the output terminals 220a and 220b including the secondary coil L6 side of the second induction coil for outputting a high frequency output as shown in FIGS. Frequency parallel resonant high-frequency power using the work coil L7 as an inductance is radiated at both ends of the capacitor C7 to high-frequency heat a load object approaching the work coil L7. In the embodiment of the present invention, the high-frequency current corresponds to tens to hundreds of kHz, and unlike the high microwave frequency band, the high-frequency output mainly affects an object at a close distance without being radiated from the work coil L7 to a long distance, When an object close to the object L7 is made of electromagnetic induction material, the nearby object is heated by the energy of the high frequency power.

3, both ends of the work coil L7 are inserted into the output terminals 220a and 220b, which are electrodes for attaching and detaching the work coil L7 to the front surface portion of the work coil body 200, The final output stage capacitor C7, the core 230 of the second induction coil, and the core 230 are wound in the work coil body 200, And the primary coil L6 of the second induction coil is provided.

Referring again to FIG. 1, in setting the output frequency of the oscillation circuit unit IC1, the LC value setting for the maximum resonance of the parallel LC resonance of the work coil L7 and the capacitor C7 , It is preferable that the LC values of the LC resonance circuits of the first and second half bridge circuits are preliminarily set so as to satisfy 1 / 2.pi.LC corresponding to the desired resonance frequency of several tens to several hundreds of KHz.

Thus, the current is induced from the primary coil L5, which is the output terminal of the final half bridge circuit (second half bridge circuit in the case of two-stage amplification) that supplies the final resonance amplified current to the work coil L7 And both ends of the secondary side L6 connected to the work coil L7 at the rear end thereof are connected to one end of the secondary side so as to be spaced apart in the core 230 wound with the primary side coil L5 A first conductor 220b-240b connected to the conductive metal plate and the pipe connected to each other in FIGS. 3 through 4, and a second conductor 220a- 240a.

The capacitance values of the LC resonance are estimated by a combination of a plurality of capacitor elements connected in series and parallel to the first and second leads 220a-240a and 220b-240b, The inductance value of the LC resonance is assumed.

In the present invention, as one element of the feedback signal that varies at the resonance frequency and varies so as to separate the frequency from the resonance frequency, not only the distance from the load object due to the movement of the work coil, And the inductive reactance value which is changed when the electromagnetic characteristic inherent to the load object is changed by the heating of the load object is also included. At this time, according to the present invention, the oscillation frequency is shifted to the resonance frequency, and when the stable feedback signal is obtained, the feedback signal is raised again. The frequency of the maximum resonance frequency approach where the feedback signal is stably fed is varied to correct the high- So that the stable maximum resonance amplification is performed.

 Meanwhile, in configuring the final output stage capacitor C7 in combination with a plurality of capacitors in series and parallel connection, in addition to the first and second conductors 240a and 240b to be soldered, a plurality of capacitors for distributing a high withstand voltage of the capacitors And a third lead 240C for series connection between the capacitors. Here, at least a part of the first, second, and third lead wires 240a, 240b, and 250c may be formed of a copper pipe having high electrical conductivity and high thermal conductivity, It is also desirable to provide a structure capable of dissipating high-temperature heat generated by a high current flow by being attached to the heat sinks 250a and 250b insulated from each other.

2 to 4, reference numeral 260 denotes an insulating material structure for holding the heat dissipating plates 250a and 250b apart from each other and fixing the core 230. Reference numeral 272 denotes a fastening binder for fixing the core to the insulating material structure. And 222 and 262 are fastening screws.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Can be interpreted more comprehensively.

For example, although mainly described as one or two half bridge circuits as the amplifying circuit and one or two induction coil parts, it should be understood that the three half bridge circuits and the three half bridge circuits Even if an induction coil is used, it is said to be included in the right. In addition, in the present invention, the feedback extractor is installed at a position where a change in output current is detected using a coil product to extract a feedback signal. If the installation position is somewhat different and the feedback signal extraction method is not an electromagnetic induction method, The present invention is not limited to the above-described embodiments, and the present invention is not limited thereto.

100 - Controller body part 200 - Work coil body part
210a and 210b - Work coil connection ports 220a and 220b - Output terminals
42 - Power plug 44 - Wiring
SW - Switch (Closed switch) L7 - Work coil
C7 - output stage capacitor IC1 - oscillation circuit part
CD1 - CDS element PC1 - Photocoupler
ZD2 - Zener diode LED1 - LED device
L4 - Coil product (coil that induces high frequency signal and generates feedback signal)
C1 - Capacitor (capacitor to be charged when the switch SW is turned off)
R3 - Resistance (Time-of-flight resistance to set the LED light-off time by providing the charging time constant of C1)
C8 - capacitor (capacitor constituting the time constant of oscillation frequency of CDS element and IC1)
Q1, Q2, Q3, Q4 - switching elements

Claims (9)

An oscillation circuit for outputting a high frequency signal generated by oscillating a frequency by a time constant; an amplifying circuit for amplifying the high frequency signal outputted from the oscillation circuit in one or more stages; An output terminal 220a and 220b connected to the coil L7 for outputting the high frequency power amplified and output from the amplifying circuit to the work coil L7 and an output terminal 220b connected in parallel with the work coil L7, And a capacitor C7 connected to the output terminals 220a and 220b and is connected to the LC resonance of the capacitor C7 and the work coil L7 in a state where the work coil L7 is connected to the output terminals 220a and 220b. And heating the load object with a high frequency power resonated by the resonator;
A feedback extractor provided between the amplifying circuit and the output terminals 220a and 220b to obtain a feedback signal at a voltage level according to the magnitude of the high frequency current; A photocoupler PC1 that is applied to the primary side through the zener diode ZD2 and turns on the secondary side, an LED element LED1 that emits light when the driving current is supplied to the secondary side of the photocoupler PC1, A CDS element CD1 for varying the resistance value according to the amount of emitted light of the element LED1 and changing the time constant of the oscillation circuit by varying the resistance value to vary the oscillation frequency, A switch SW which is turned on / off in accordance with a user operation to turn off / on the LED element LED1, and a switch SW which is turned on / off according to a user operation in a state where the LED element LED1 is turned on, While time to charge during the operation of the switch (SW) to but comprises a capacitor (C1) to gradually change the brightness to off-state for the LED elements (LED1) in the light-on state;
The output frequency of the oscillator circuit at the time of completion of charging the capacitor C1 is set according to the LC resonance frequency of the work coil L7 and the capacitor C7 and the frequency of the variable capacitor C1 ) Is set so that the oscillation circuit output frequency in the charging start state of the oscillation circuit is in a frequency spaced apart from the LC resonance frequency of the work coil (L7) and the capacitor (C7) So as to gradually change frequency in accordance with the charging time of the capacitor (C1) as a frequency approaching the LC resonance frequency at a frequency remote from the LC resonance frequency;
The feedback signal of the feedback extractor is applied to the primary side of the photocoupler PC1 and the light emission level of the LED element LED1 is varied according to the secondary current amount of the photocoupler flowing in proportion to the feedback signal applied to the primary side Frequency oscillation frequency of the oscillation circuit is varied to approach or away from the LC resonance frequency of the work-coil side so that the high-frequency output is proportionally controlled in accordance with the real-time feedback signal. Device.
The method according to claim 1,
Wherein the oscillation circuit is configured to output a high-frequency oscillation signal at a half-wave period alternating with an upper and a lower channel output;
The amplifying circuit is a half bridge circuit for receiving an output of the oscillating circuit and amplifying and outputting a high frequency to the output terminals 220a and 220b. The half bridge circuit includes an upper and a lower two channel switching The LC resonance elements L1 and C3 (L1 (L1) and C3 (L1) and C4 (C3) connected to the elements Q1 and Q2 are alternately up- C4 using the primary coil L5 of the induction coil and the high frequency current derived from the primary coil L5 of the induction coil through the output terminals 220a, And the secondary coil L6 made of a coil or a conductor is configured to be electromagnetic induction-compatible with the primary coil L5 so as to flow the electromagnetic wave to the primary coil L5.
The method according to claim 1,
Wherein the oscillation circuit is configured to output a high-frequency oscillation signal at a half-wave period alternating with the upper and lower two channel outputs,
Wherein the amplifying circuit includes a first half bridge circuit for receiving and amplifying the output of the oscillation circuit and a second half bridge circuit for secondarily amplifying and outputting the high frequency amplified first amplified from the first half bridge circuit Stage amplification circuit,
The first half bridge circuit includes LC elements L1-C3 and L1-C4 connected to the output terminals of the upper and lower two-channel switching elements Q1 and Q2 to which the output signal of the oscillation circuit is applied, Signal is subjected to first LC resonance amplification and output to the primary coil L1 of the first induction coil, and the primary coil L1 of the first induction coil is used as the inductor of the first LC resonance amplification,
The second half bridge circuit receives the high frequency signal amplified first in the first half bridge circuit through the secondary coil (L2, L3) of the first induction coil and receives the high and low two channel switching elements (Q3, Q4 LC resonance amplification is performed by LC elements (L5-C5) (L5-C6) connected to the upper and lower two-channel switching elements (Q3, Q4) so as to perform LC resonance amplification on the primary side The primary coil L5 of the second induction coil is used as the inductor of the secondary LC resonance,
The primary winding of the second induction coil is connected to the primary coil L5 of the second induction coil to induce the amplified high frequency current applied to the primary coil L5 of the second induction coil to flow to the work coil L7 through the output terminals 220a, And the secondary coil L6 is wound around the core 230 so that the primary coil and the secondary coil are electromagnetic induction-matched to each other, And a conductor (220b-240b) passing through the center of the coil or the core (230).
The feedback extractor (L4) according to claim 2, characterized in that the feedback extractor (L4) is constituted by a coil product installed at the rear end of the secondary coil of the induction coil to induce a high-frequency signal of the trailing end in the secondary coil of the induction coil, Analog high frequency resonance induction heating device.
The method of claim 3,
The feedback extracting unit L4 is provided at a rear end of one of the upper and lower channels (L2 or L3) of the secondary coil of the first induction coil, and outputs a signal flowing to the rear end of the secondary coil of the first induction coil And a coil product (L4) for electromagnetic induction to generate a feedback signal.
The method according to claim 2 or 3,
A work coil body portion 200 held by a user for switching operation of a user by approaching a load object and a control body portion 100 fixedly installed are connected by a wiring 44;
The work coil body 200 is provided with a capacitor C7 connected externally with the output terminals 220a and 220b and the switch SW and connected to the output terminals 220a and 220b, C7 and a primary coil L5 for electromagnetic induction to the secondary coil L6 are internally provided and the output terminals 220a and 220b are connected to the work coils L5 and L6, The connection ports 210a and 210b are configured to be externally exposed as an electrode to be coupled and detached in a manner to be exposed and exposed outwardly;
Wherein the control body unit (100) is constructed such that the constituent circuits of the second or third aspects other than the constituent parts provided in the work coil body unit (200) are installed internally. The analog automatic control type high frequency resonance induction heating Device.
The method according to claim 2 or 3,
The work coil L7 and the capacitor C7 are formed by presetting the inductance and the capacitance value for the LC value so that the resonance frequency is set to a frequency of several tens to several hundreds of KHz to satisfy 1/2? LC;
The oscillation frequency of the time constant circuit for determining the oscillation frequency of the oscillation circuit and the LC resonance frequency of the half bridge circuits are set in advance according to the LC value of the work coil L7 and the capacitor C7, Wherein the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency
The method according to claim 6,
Both ends of the output terminals 220a and 220b for supplying the current to the work coil L7 are connected to the primary coil L5 of the induction coil to which a signal amplified by the half bridge circuit at either end is wound A second conductor 220b-240b spaced apart from the core 230 and another end thereof being spaced apart from the core and used as a second conductor to receive a high frequency current flowing to the primary coil L5 of the induction coil;
The capacitor connected between the first lead and the second lead is set to match the capacitance value of the LC resonance and is configured to be subjected to withstand voltage distribution and capacitive collection by a combination of a plurality of capacitor elements connected in series and in parallel;
When the Zener diode ZD2 is a current exceeding a preset current value flowing at a time point at which the work coil L7 resonates with the capacitor C in the reverse voltage standard value, the feedback voltage is applied to the Zener diode And the standard value is set so that the photocoupler is operated in excess of the reverse voltage.
9. The method according to claim 8, wherein in the direct and parallel connection of the plurality of capacitors constituting the capacitor (C7), a capacitor (C7) is interposed between the first and second conductors and between the series connection of the capacitors 3 leads;
The first, second and third lead wires are formed of a copper pipe at least a part of the lead wire body, and the first and second lead wires are attached to the heat sinks 250a and 250b arranged to be insulated from each other, Wherein the heat sink is structured to radiate heat by heat conduction to the heat sink.

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