KR100330815B1 - Microwave Heating System - Google Patents

Abstract

end. Technical field which belongs to invention described in claims

The present invention relates to an ultra-high frequency heating apparatus having a power control circuit that can linearly adjust matching power.

I. Summary of the technical problem and solution to be solved by the invention

In constructing a power control circuit that controls the ultra-high frequency output of a conventional microwave heating device, the magnetron generating ultra high frequency causes cathode reverse heating due to its driving characteristics. This phenomenon increases the temperature of the filament and does not change the filament voltage characteristics. Oscillation becomes unstable and many problems caused by the failure of the magnetron damage or shortening of the sleep caused by this. In addition, in the conventional oscillation device, in most cases, the anode transformer and the filament transformer are integrally formed, and when the input voltage is increased during power control for output control, the anode voltage and the filament voltage are simultaneously raised, and the magnetron is rapidly increased. The service life was shortened, and when the input voltage was lowered, the anode voltage and the filament voltage were lowered at the same time, resulting in unstable oscillation such as unstarted or deteriorated output. The power that causes cathode reverse heating depends on the microwave impedance setting conditions and the magnitude of the anode current. That is, in order for the magnetron to operate normally, the peak anode voltage (Ebm), the average anode current (Ibm), and the filament voltage (Ef) substantially supplied to the magnetron must be matched according to the output. In order to increase the ultra-high frequency output, the anode voltage is increased and accordingly the anode current is increased, so the filament temperature is increased, the electrical resistance is increased, and the current is decreased, so the filament voltage must be decreased. In the output stage of power control for output control, when the input supply of the positive voltage is increased, the input supply of the corresponding filament voltage should be lowered in consideration of the positive current.

Therefore, if the operator sets the high frequency output separately by separately forming the anode transformer and the filament transformer, the voltage and current amount is pre-detected at the output of the power control circuit, and the main controller of the power control circuit is detected according to the detected value. The feedback pressure is controlled according to the magnetron operating characteristics to change the constant pressure output.

All. Important uses of the invention

The present invention is applied to food drying, heating cooking, thawing and vulcanization of automobile tires, natural rubber for manufacturing, gaskets for automobile doors, and other rubber products, clay drying, fiber drying, artificial dog preparation, mold prevention of food, food It can be applied to all areas of heating and vulcanization systems such as reheating, wood drying, wood bonding, wood bending and leather processing.

Description

Microwave Heating System

The present invention relates to an ultra-high frequency heating apparatus using a power control circuit that can linearly adjust the output, and in particular, by separately forming a high voltage transformer and a filament transformer separately in the power control circuit. When the operator sets the desired high frequency output amount, the output terminal of the power control circuit detects the voltage and current in advance, and according to the detected value, feedback from the main controller of the power control circuit in accordance with the magnetron operating characteristics Feed-Back) to control the matching power (Matching Power) variable.

In addition, the present invention is applied to the drying process of food drying, heating cooking, thawing and car tires, natural rubber for manufacturing, gaskets for automobile doors, other rubber products, clay drying, fiber drying, artificial dog manufacturing, food mold prevention, It can be applied to all areas of heating and vulcanization systems such as food reheating, wood drying, wood bonding, wood bending and leather processing.

In general, electrothermal heating or gas heating has been widely used to change the state by heating the heated object, but the above methods are inefficient, take a long time to increase the temperature, are not easy to control the temperature, and are sensitive to the external environment. There was a problem that the thermal conductivity was lowered during heating.

In order to solve the above problems, a heating method that is frequently used is a microwave heating method. The microwave heating method can be heated to the inside of the heating body in a short time because it is not dependent on heat conduction, and the heating efficiency is good because 80% of the microwave power is exchanged with heat, and the microwave is penetrated into the heating body and converted into heat. It can be heated evenly in the shape of material, easy to control heating power, excellent stability of power source against fluctuations of load condition, easy to prevent external leakage of radio waves, and sealed heating, Difficulty in working environment due to heat or exhaust gas can be prevented.

Therefore, the microwave heating method is a heating method suitable for heating such as the shape of the object to be heated, the poor thermal conductivity, the internal heating takes a long time, and is widely used in fields such as domestic heating and drying, as well as domestic use. have.

On the other hand, the heating method using the microwave is a method of absorbing and heating the electromagnetic wave in the moisture contained in the interior of the heating target, a large energy can be input from the initial stage to half the moisture, but drying of the heating target It is necessary to control the output at the moment when the resistance increases so that the moisture contained in the interior becomes smaller and the remaining moisture diffuses to the surface. If output control is abnormally performed, the input energy becomes excessive and the heating target is not dried uniformly, and the heating target is partially overheated and ignited. In addition, when the output of the microwave is completely applied at a time in a state where the load of the object to be heated is small, a reverse shock is given to the components such as the magnetron, and a breaker may be opened due to a large inrush current.

Therefore, by varying the output according to the size of the load, moisture content, drying progress, etc., the energy efficiency can be increased, optimal heating can be performed according to the load of the heating element, and local heating of the heating element can be prevented. Sparking and overheating of parts can be prevented.

Conventional output variable method is a method of controlling the output with an inverter, a method of periodically turning on and off the microwave output heating time, by dividing the total time to be heated into two or three stages to automatically adjust the output step by step can do.

The inverter method includes a resonant output control method and a voltage control method using a feedback (Feed-Back). The resonant output control method may be in an uncontrollable state when the resonance condition collapses, and the voltage using the feedback is used. The control method has a problem in that it is difficult to perform real-time control. In addition, the on-off method has a problem that the life of the magnetron is shortened because the magnetron is overloaded because the oscillation is repeatedly repeated for a short time during the heating time. There was a problem in that localized heating was generated in the heated object due to propagation imbalance inside the heating tank even though the output was not set and arithmetically adjusted.

In order to solve the above problems, various methods have been devised. For example, in the application number 91-25635, when the voltage across the switching element of the inverter circuit and the current between the primary winding of the high voltage transformer are sensed, the inverter detects an overvoltage and an overcurrent. By stopping the driving of the circuit, not only the switching element is protected but also the voltage applied to the magnetron is controlled to a predetermined value or less before the start of the magnetron oscillation, and the circuit is configured so that the input current applied to the magnetron is maintained after the oscillation.

However, in the application number 91-25635, the RC filter is connected to the secondary side of the high voltage transformer to limit the current and input the voltage value induced in the error amplifier, and minimize the difference between the induced voltage and the preset reference set value. A circuit for controlling an output by operating an error amplifier so that the filament transformer and the positive voltage transformer of the high voltage transformer is integrated, so that when the operator increases the high frequency output by controlling the positive current value, The anode current value increases simultaneously and the voltage value of the filament transformer also increases. Due to this phenomenon, the temperature of the filament is sharply increased, which causes the problem of breaking the magnetron or reducing the life.

As another example, the application number 90-22434 is a converter output control method (PWM) that controls the resonance frequency on the primary side of the transformer. When resonance is unstable on the secondary side of the transformer, transient voltage or instantaneous power failure (Flickering) It will shock the magnetron.

As another example, the application number 90-22428 includes a plurality of transformers, and the transformer secondary side and the switching elements are configured as feedback to detect the transformer output, and the plurality of switching elements appropriately adjust the conduction time according to the detection value. If one of the secondary transformers is shorted or opened, overcurrent flows into the oscillator, causing the magnetron to burn out, and the control current detector can be used in a single phase, but in an unbalanced circuit in a three-phase three-wire or three-phase four-wire system. A problem of incorrectly detecting ground currents has occurred.

As described above, in the related art, the correlation coefficient (Co-Relation Factor) between the peak anode voltage (E _bm ), the average anode current (I _bm ), and the filament voltage (E _f ) actually supplied to the magnetron (oscillator) is not considered. Since the filament voltage is not compensated for as the filament current is lowered due to the negative reverse heating phenomenon of the magnetron due to the increase of the anode current, the anode current value exceeds the absolute rating of the magnetron. In addition, a short circuit occurs between the cathode and the anode of the magnetron, causing a lot of problems that the magnetron is destroyed.

In addition, since the filament transformer and the anode transformer for microwave heating are integrated, when the electrons of the inappropriate phase of the magnetron are accelerated in the microwave field and returned to the cathode by the action of the magnetic field, the cathode surface is impacted due to the reverse impact energy. Since the cathode temperature rises and thus the electric resistance increases and the current decreases, the invention needs to compensate for the cathode temperature increase due to the above-mentioned reverse shock by decreasing the filament voltage at the same time as the magnetron operation. Because the output voltage of is increased at the same time, matched output control is not possible, which leads to deterioration of magnetron.

The electron emission of the magnetron is based on the induced voltage of the filament transformer, but the intensity control of the microwave field and the speed control of the electron are controlled by the change of the voltage size of the anode transformer. Can be. Therefore, the anode and filament transformers are separately formed and the desired operator sets the high frequency output, and then the voltage and current are pre-detected at the output of the power control circuit, and the magnetron operating characteristics of the main controller of the power control circuit are determined according to the detected values. Feedback control is made to adjust the matching output.

1 is a circuit diagram schematically showing an ultra-high frequency heating apparatus according to the present invention.

2 is a graph schematically showing the amount of change in the average anode current with respect to the filament voltage of the ultra-high frequency heating apparatus according to the present invention.

Figure 3 is a graph schematically showing the variation of the high frequency matching output and the peak anode voltage with respect to the average anode current of the ultra-high frequency heating apparatus according to the present invention.

Figure 4 is a flow chart schematically showing a control method of the ultra-high frequency heating apparatus according to the present invention.

5 is a block diagram schematically illustrating a method of controlling an output power of a method for controlling an ultra-high frequency heating apparatus according to the present invention.

Figure 6 is a block diagram schematically showing a filament voltage control method of the control method of the ultra-high frequency heating apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

100: power supply unit 200: power control unit

210: sensing relay 220: main controller

230: SCR drive 240: main SMPS

251 to 254: Silicon rectifiers 1 to 4 260: Stack

300: filament transformer 400: anode transformer

410: diode 420: reactor

430: capacitor 440: resistance

500: magnetron

The present invention provides a power supply unit for supplying commercial power, a magnetron configured to generate high frequency waves by accelerating collision of electrons emitted by heating of the filament, and a filament transformer for supplying a voltage required for the filament and the positive terminal of the magnetron. And a positive electrode transformer and a stack capable of adjusting the output of the user, wherein the filament transformer and the positive electrode transformer are separately formed so as to be independently controlled, and the average positive current of the magnetron is sensed by current. If the average positive current is detected by using a deviation from the predetermined range by controlling the filament voltage in a linear relationship with the magnitude of the average positive current to maintain a predetermined average positive current value, consequently the Mark netron To control the output of the output to be the matched output It characterized by consisting of a control unit.

The power controller includes a main controller comprising a microprocessor and peripheral circuits thereof, a silicon rectifier driver (SCR driver) controlled by the main controller, and connected in series to a primary input terminal of the filament transformer and the anode transformer. Current sensing means and voltage sensing for detecting the magnitude of the current and voltage at both ends of the plurality of silicon rectifiers (SCR) and the silicon rectifier (SCR) for phase control of the input voltages of the filament transformer and the anode transformer according to the driving of the rectifier driver. Switching mode power supply (SMPS) for supplying the power required for the main controller, a sensing relay for transmitting or interrupting the current value and the voltage value sensed by the current sensing means and the voltage sensing means and a user's operation signal to the main controller. : Switching Mode Power Supply).

An output terminal of the anode transformer is provided with a diode for full-wave rectification of the transformed power, and the secondary side of the anode transformer is connected in series and prevents excessively full-wave rectified power from flowing into the circuit and entering the circuit A reactor is provided to limit the third and fifth harmonics, and the secondary side of the anode transformer includes a capacitor connected in parallel and having a smoothing action. The diode 410 is preferably an avalanche type rectifier diode in order to supply stable DC power to the magnetron. The avalanche type rectifier diode has a breakdown voltage of four times or more the operational voltage. It should be within 15% to have the input characteristics of the magnetron as necessary and sufficient conditions. The reactor 420 is a series reactor connected in series to a circuit, and has an inductance of 15 to 100 mH, and induces an electromagnetic induction upon inflow of third and fifth harmonics, thereby reducing the function within 0.5% of the fundamental wave. In addition, the capacitor 430 serves to improve the smoothness to maintain the ripple rate of the input voltage within 1%, and the resistor 440 has an unbalanced circuit between the diode 410 and ground. It is used as current limiting resistor when image current flows to earth. The capacitor 430 is preferably of a ceramic type so as to secure an insulation distance and ensure the stability of the circuit at a high voltage.

BEST MODE Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description, a single phase AC power is used as the power supply of the filament transformer, and a three phase AC power supply is used as the power supply of the positive electrode transformer. However, the technical idea of the present invention is not limited thereto. Care must be taken.

As shown in FIG. 1, the single-phase or three-phase AC power is supplied from the power supply unit 100 via a terminal board 1 (TB1) and a terminal board 2 (TB2) to the silicon rectifier (Silicon Controlled Rectifier) SCR of the power control unit 200. It is input to 1-4 (251-254).

In the silicon rectifiers SCR 1 to 4 (251 to 254) of the power control unit 200, a commercial AC voltage input to the filament transformer 300 and the anode transformer 400 is controlled by using a phase control method. The currents I _R , I _S and I _U detected by the current sensing means (not shown) are used as detection elements for controlling the anode current value input to the magnetron, wherein the current I _U is the filament transformer 300. The current I _R , I _S is input to the anode transformer 400.

In addition, the currents I _R , I _S and I _U detected by the current detection means are input to the sensing relay 210 of the power control unit 200 through an input / output detection terminal (not shown), and a circuit A voltage value directly detected at one predetermined portion of the input signal is also input to a sensing relay 210 of the power control unit 200 through the input / output detection terminal (not shown).

The value input to the sensing relay 210 is input to the main controller 220 again, and the main controller 220 performs an appropriate control operation through a comparison and calculation process.

In addition, the filament transformer 300 converts the voltage of the power supply unit 100 controlled by the silicon rectifiers 251 to 254 of the power control unit 200 to a predetermined voltage and supplies the magnetron 500 to the oscillation function. In general, the filament voltage (E _f ) is 4.0 V and the average positive current (I _bm ) is 0 경우 in the case of standard products with power applied (at the time of preheating).

The graph shown in FIG. 2 shows the amount of change in the average anode current I _bm with respect to the filament voltage E _f , where the filament voltage E _f and the average cathode current I _bm ) is maintained at a constant value, but changes in a stable state as long as it has a linear relationship with each other as shown in FIG. Here, it can be seen that the average positive current value can be controlled by changing the filament voltage.

In an embodiment of the present invention, the filament voltage E _f maintains a maximum value of 4 + 0.2 V and a minimum value of 4-0.2 V based on an initial value of 4 V. When the filament voltage E is stable, _f ) is 2.2 V and the average anode current I _bm is 840 mA.

The graph shown in Figure 2 can be thought to associate with the graph of Figure 3 showing a change curve of the high frequency matching output (P _o) and the peak positive voltage (E _bm) in accordance with the average cathode current (I _bm).

For example, in order to provide feedback of the secondary high voltage circuit, the graph of FIG. 3 will be described. For example, when the filament voltage E _f and the average anode current I _bm reach a predetermined voltage and current value, electron emission of the filament is started. In other words, when the filament voltage (E _f ) is 2.2 V and the average anode current (I _bm ) is 840 ㎃, the electron emission of the filament starts and oscillation becomes possible, and the high frequency output is 2,000. If it is set to W, it can be seen that the average anode current (I _bm ) is 570 ㎃ and the peak anode voltage (E _bm ) is 4,930 V _p , and the filament voltage (E _f ) when the average anode current (I _bm ) is 570 ㎃ ) Is about 2.8 V (for standard products). That is, when the high frequency output amount is set, the value of the anode current according to the magnitude of the voltage supplied by the filament is determined, and at this time, the average anode current value I _bm by the peak anode voltage E _bm determined by the oscillator (magnetron) is matched The desired matching output will be obtained.

When the above correlation is calculated by numerical method, the following equation is established.

E _f = a + b * I _bm

P _o = ε + (α + β * E _bm + γE _bm ² -δ * E _f ) * I _bm

In the above equation

P _o : High frequency matching output, E _bm : Peak positive voltage, E _f : Filament voltage,

I _bm : average positive current, a, b, α, β, γ, δ: constant

That is, as represented by Equation 1, the filament voltage E _f is initially represented by a random value a (when the average positive current value is 0), and then increases as the average positive current value I _bm increases. It is expressed as a linear function by the proportional constant b. According to the graph shown in FIG. 2, since the relationship between the filament voltage E _f and the average positive current value I _bm is inversely proportional, the proportional constant b is represented as a negative integer.

In addition, as shown in Equation 2, the high frequency match output (P _o ) can be simply expressed as a quadratic function by the least-squares method, but the high frequency match output (P _o ) is initially (when the average positive current value is zero). ) If the average positive current I _bm is determined by the filament voltage E _f , the average positive current value I _bm , the peak positive voltage E _bm , and the filament voltage E _f ) can be approximated.

Hereinafter, a detailed driving method of the present invention will be described in detail.

As shown in FIG. 1, when the power is switched to 'ON', the single-phase or three-phase AC power introduced from the power supply unit 100 passes through the terminal boards TB1 and TB2 and the silicon rectifiers SCR 1 to 1 of the power control unit 200. It is controlled at 4 251 to 254 and is transmitted to the filament transformer 300 and the anode transformer 400.

Therefore, the filament transformer 300 and the positive voltage transformer 400 generates a filament voltage (E _f ) and a peak positive voltage (E _bm ), in which the operator power control unit (not shown) of the stack (260) When the output amount is adjusted by using the controller, the main controller 220 of the power controller 200 performs a comparison operation and performs an appropriate control operation.

Since the stack 260 includes a heat sink (not shown) and a power control unit (not shown), an operator can manually set the high frequency output of the power control unit 200 by manually adjusting the power control unit. In order to vary the output with respect to the amount of change in the applicator, the magnetron changes the high frequency matching output according to the change of the peak positive voltage (E _bm ) and the average positive current (I _bm ).

On the other hand, when the power is switched to the 'ON' state, power is supplied to the filament transformer 300 and the anode transformer 400, wherein the filament voltage (E _f ) and the average positive current (I _bm ) is a predetermined voltage, current value When the filament reaches the electron emission of the filament is started and stabilized. For example, when the filament voltage (E _f ) is 2.2 V and the average positive current (I _bm ) is 840 전자, the electron emission of the filament is started to oscillate When the operator adjusts the power control unit of the stack 260 to set the high frequency output to 2,000 W, the average positive current I _bm is 570 ㎃ and the peak positive voltage E _bm is 4,930 V _p . At this time, the filament voltage E _f is about 2.8 V.

That is, when the high frequency output is set, the value of the anode current according to the magnitude of the voltage supplied from the filament transformer 300 is determined, and at this time, the average anode current value I by the peak anode voltage E _bm determined by the magnetron 500. _bm ) must match to get the desired matching output.

In addition, the main controller 220 of the power controller 200 receives the current value detected by the current sensing means and the voltage value detected by the voltage sensing means through the input / output detection terminal and the sensing relay 210. The high frequency matching output (P _o ) is calculated through a predetermined calculation process, the calculated high frequency matching output (P _o ) is compared with a preset reference frequency matching output (P _{o_ref} ), and the error is proportionally integrated. Power control and filament voltage by controlling theta scaling to equalize the error according to the phase, and phase control using silicon rectifiers SCR 1 to 4 (251 to 254) for triggering. Take control.

Since the filament voltage E _f and the average anode current I _bm change linearly, the _{f f} -I _bm table previously stored in the memory of the main controller 220 of the power control unit 200 is used as a reference. By detecting the current I _R and I _S of the primary side of the anode transformer 400 with current sensing means, the primary side of the filament transformer 300 is supplied so that a stable current is supplied by compensating reactive power (magnetization current) generated in the anode current. The value is compared and followed by the control, and the positive voltage corresponding thereto is compared with the value input to the actual magnetron 500 by inputting the compensation for the voltage drop into the main controller 220 in advance.

The E _f -I _bm Table is a table created by quantifying a change amount of the average anode current I _bm with respect to the filament voltage E _f shown in FIG. 2, and is a memory of the main controller 220 of the power controller 200 in advance. Remembered.

Meanwhile, as illustrated in FIGS. 4 to 6, the voltage value and the current value transmitted from the input / output detection terminal are transmitted to the main controller 220 through the sensing relay 210 of the power control unit 200, and the main controller 220. At 220, after controlling the silicon rectifiers 251 to 254 through the SCR drive 230, the filament voltage V _p is adjusted to maintain a predetermined voltage value (step 10), and then the peak anode voltage E at that time. _It is determined whether _bm ) represents a predetermined voltage value (step 11), and when the peak anode voltage E _bm does not represent a predetermined voltage value, it is fed back to the silicon rectifiers 251 to 254 through the SCR drive 230. Control the filament voltage (V _p ) (step 10), and when the peak positive voltage (E _bm ) indicates a predetermined voltage value, the main controller 220 is previously controlled in accordance with the state of the power control unit adjusted by the operator. Stored in memory A and reads the high frequency matching output (P _{o_ref)} (step 12), the reference high frequency matching output (P _{o_ref)} and sensing relay 210 is the high frequency matching output (P _o) calculated by using the input value passed from the computing unit Theta is scaled to equalize the error according to the phase, and the filament voltage is controlled by phase control through the silicon rectifiers SCR 1 to 4 (251 to 254). By controlling the voltage, the matching output of the magnetron is controlled by voltage (Step 13).

In addition, the filament current I _b is read through the sensing relay 210 (step 14), and the filament voltage value E _f and the average positive current value I _bm transmitted from the sensing relay 210 are used. The reference filament voltage value E _{f_ref} and the filament voltage value E _f transmitted from the sensing relay 210 are calculated using the E _f -I _bm Table (see FIG. 2) preset in the main controller 220. Using the silicon rectifiers SCR 1 to 4 (251 to 254) to perform theta scaling and theta scaling to equalize the error according to the phase, and to trigger the error. The filament voltage control (step 15) is performed by the phase control, and accordingly the feedback is controlled again to control the output power.

The present invention operates the magnetron 500 by feedback control of the filament voltage E _f , the average anode current I _bm , and the peak anode voltage E _bm through a main controller 220 built in the power controller 200. Optimal control of characteristics has the following effects.

Firstly, uniform heating and optimal heating are possible for the change of load size or shape, and secondly, it is possible to improve productivity and reduce manufacturing cost by controlling the amount of power. Third, it is easy to control heating temperature and various objects (rubber of Vulcanization, thawing or sterilization) and the operator can easily adjust the heating time, thus enabling factory automation. Fourth, the life and reliability of the magnetron is improved. Sixth, it is possible to protect parts, and if the moisture content of load is changed suddenly, it is possible to prevent fire by adjusting the output step by step. There is an effect that can be prevented in advance.

Claims (7)

A power supply unit for supplying commercial power, a magnetron configured to generate ultra-high frequency waves by accelerating collision of electrons emitted by heating of the filament, a filament transformer and a cathode transformer for supplying a voltage required for the filament and the positive terminal of the magnetron. And, in the conventional ultra-high frequency heating device configured to include a stack that the user can adjust the output, the filament transformer and the anode transformer is formed separately to be controlled independently, and the filament current at the input terminal of the filament transformer and the anode transformer Ultra-high frequency heating device characterized in that it comprises a power control unit for detecting the anodic current to calculate the matching output error value, and then compensate for this through the filament voltage. The method of claim 1, The power control unit is connected to the main controller consisting of a microprocessor and its peripheral circuit, a silicon rectifier driver (SCR DRIVER) controlled by the main controller and the first input side of the filament transformer and the anode transformer in series A plurality of silicon rectifiers (SCR) for phase-controlling input voltages of the filament transformer and the anode transformer according to the driving of a silicon rectifier driver, and current sensing means for detecting the magnitudes of current and voltage at both ends of the silicon rectifier (SCR); Switching mode for supplying the voltage sensing means, a sensing relay for transmitting or intermitting the current value and voltage value sensed by the current sensing means and the voltage sensing means and the user's operation signal to the main controller, and the power required for the main controller It is configured to include a power supply (SMPS: Switching Mode Power Supply) High frequency heating apparatus made with. The method of claim 1, The anode transformer is provided in the output terminal and the diode for full-wave rectification of the transformed power, and is connected in series to the secondary side to prevent the excessively full-wave rectified power from the diode flowing into the circuit 3, 5 A reactor for limiting harmonics and an ultra-high frequency heating device, characterized in that it comprises a capacitor connected in parallel to the secondary side to perform a smoothing action. The method of claim 3, wherein A resistor 440 having a predetermined value is connected to a lower end of the diode 410 to detect a positive current value, and the detected current value is input to the sensing relay 210 of the power control unit 200 to provide a filament transformer ( 300) and the ultra-high frequency heating device, characterized in that compared with the current value output from the anode transformer (400). The method of claim 3, wherein The smoothing capacitor (430) is a high-frequency heating device having a linear output variable device of the ceramic (Ceramic) type to ensure the insulation distance and high withstand voltage. The method of claim 3, wherein The diode is an ultra-high frequency heating device having a linear output variable device, characterized in that using an avalanche type high voltage diode to supply a stable DC power to the magnetron (500). A power supply unit for supplying commercial power, a magnetron configured to generate ultra-high frequency waves by accelerating collision of electrons emitted by heating of the filament, a filament transformer and a cathode transformer for supplying a voltage required for the filament and the positive terminal of the magnetron. And, in the conventional ultra-high frequency heating device configured to include a user-controlled stack, the filament transformer and the anode transformer is formed separately to be controlled independently, the filament current or at the input terminal of the filament transformer The method of matching output control of a power-controlled ultra-high frequency heating device, characterized in that the detection of the anode current to calculate the matching output error value, and then compensates for this through the input voltage of the filament transformer.