JPH01500233A - Magnetic tube control method and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Magnetic tube control method and device The present invention provides a method for controlling magnetrons in equipment in which microwave energy is used for heating purposes. and related to equipment.

Microwave heating has been successfully applied in many processes involving thermal energy supply. It is a technique to obtain. One important advantage in this regard is that the heating force has no inertia. It is something that can be controlled without having to provide anything.

However, one drawback is that microwave equipment is often It is expensive compared to The magnetron tubes of such heating equipment are electrically equipped with a control device. It is powered by a power source, and this part accounts for most of the equipment's price. one Due to the limited power output of magnetrons, heating devices often require a large number of magnetrons and It is equipped with a power supply, a power supply, and a control device to meet given heating performance requirements.

Magnetoelectric tubes are mostly used as microwave generators for heating purposes. This point One decisive characteristic for this is high efficiency in converting DC power into microwave power. and the compact geometric structure of the magnetron. One major drawback is given The voltage required to generate the output is different for each magnetron. This voltage is It is determined by the geometric circular internal structure of the tube and the strength of the magnetic field within the cavity.

There are two types of magnetrons, those in which the magnetic field is generated by a permanent magnet, and those in which the magnetic field is generated by a permanent magnet. It is something that is produced by stone.

The strength of permanent magnets also changes during the manufacturing process and operation.

The structure of the magnetic tube includes a magnetic yoke whose magnetic permeability changes with temperature. anode current The operating curve, which is shown by a graph plotting the anode voltage against the temperature inside the magnetron, It fluctuates due to changes in the geometric structure as the temperature changes. The output is accurately connected to the anode electrode. proportional to the flow.

Due to this situation, it is not possible to directly drive a large number of magnetic tubes with a common power source. do not have. There is an inflection point in the above graph, which is the so-called inflection point voltage. Above the value of , the magnetron output increases greatly.

Two or more magnetrons are connected in parallel to one power source, and the magnetrons are usually As shown in the table below, one magnetron is different from the other if it has mutually different operating curves. Generates greater output. There are other magnetic tubes that generate a higher output. As a result, the operating curve decreases and the power supply generates a lower voltage.

For this reason, the output of the electric tube, which is generating a small output, further decreases, and eventually Since the bending voltage of the other magnetic tubes is lower than that of the other magnetic tubes, one magnetic tube can generate the full output. Become.

As a basic unit, each @ tube must be controlled individually, and at the same time a power supply is required. It is also necessary to reduce the number of related control devices.

This problem has been solved by the present invention, and here a magnetron tube with a permanent magnet is also used. It is possible to supply power to magnetrons equipped with electromagnets from one or the same power supply device. Toshi ℃ is there.

Therefore, the present invention is equipped with a large number of magnetic tubes, and the microwave output of the magnetic tubes is Relating to a method for controlling, for operating two or more magnetrons; Connected in parallel to one power supply that generates high voltage; A separate magnet with a measuring device for measuring the anode current on the high voltage side of each magnetron. connect the tube regulation circuit; and galvanically isolate the measuring device from the control circuit; The control circuit controls the anode current of the magnetic tube in response to the signal generated by the measuring device. It is characterized in that it is configured to control.

In another feature, the present invention provides for two or more devices powered by one and the same power source Regarding the above i-tube control means or device, the features of this means are defined in the following claims. Described in Section 10.

The present invention will now be described in more detail by referring to some embodiments illustrated in the accompanying drawings. do clarification.

Figure 1 shows how two or more magnetrons are connected to one power supply and have separate adjustment circuits. 1 is a schematic diagram of a first embodiment of a circuit or connection having a circuit; FIG.

FIG. 2 shows a first embodiment of a control device associated with the regulating circuit.

FIG. 3 shows a second embodiment of a control device associated with the regulating circuit.

FIG. 4 shows a sixth embodiment of a control device associated with the regulating circuit.

Figure 5 shows how two or more magnetrons can be connected to one power supply and have separate adjustment circuits. 2 shows a second embodiment of a circuit or connection according to the invention with a circuit;

FIG. 6 shows a typical anode voltage-anode current (vA-IA) graph for a magnetron.

FIG. 7 shows a schematic diagram of a circuit for separating two circuits electrically or electrically.

FIG. 6 shows a typical anode voltage-anode current graph for a magnetron. The curve of the graph There is an inflection point at voltage (vo). Magnetic tubes have a voltage below the bending point voltage (vo) will not emit any output. At voltages above the inflection point voltage, the operating resistance is low and the voltage changes from no output to full output. The amount of voltage increase to output is small. The output of the magnetic tube is the anode current (IA) with high accuracy. is proportional to.

As mentioned earlier, there are two types of magnetrons, that is, the magnetic field is generated by a permanent magnet. The magnetic field is generated by a magnetic coil and a magnet. be. In the former type of magnetic tube, the voltage at the bending point is fixed, but in the latter type, the voltage at the bending point is fixed. The voltage can be controlled by controlling the current flowing through the windings, as shown by the dashed line and arrow in Figure 6. can be controlled or adjusted.

As mentioned earlier, the (vA-飄) graph is for magnetic tubes with the same specifications. However, due to instrumental differences between magnetrons, they do not match perfectly. Therefore this However, there are problems when powering two or more magnetrons from one common power supply. This is the basic reason.

The present invention provides a method and means or apparatus for controlling the microwave output of a plurality of magnetrons. In this, two or more magnetic tubes are connected in parallel to efficiently transmit high voltage for magnetic tube operation. connected to a power supply that generates According to the invention, each magnetron is Each is connected to a separate regulation circuit. The regulating circuit has a measuring device, which is a magneto-electric It operates by measuring the anode current flowing through the high voltage side of the tube. The high voltage side of the magnetic tube By measuring the flowing anode current, the anode current of each of the magnetrons present can be determined individually. The anode of the magnetron tube is directly grounded, which is important for safety reasons. It is essentially important from the point of view of

If the anode current is measured on the low voltage side, i.e. between the anode and the ground wire, for example , the magnetron is lifted to a given potential, but the magnetron at all It is not housed in a grounded containment, but rather this containment contains magnetrons, waveguides, Assuming that it is insulated from the pipe and heating vessel, this is acceptable from a safety point of view. Hana (ゝO The measuring device is configured to send a signal to the control circuit. The measuring device is placed on the high pressure side. It is electrically isolated from the central circuit because it is operates at relatively low voltages, for example normal mains voltage.

The purpose of the control circuit is to control the anode current and therefore the output of the magnetron, which is This is done in response to the received signal from the measuring device.

According to one embodiment, the measuring device has a resistor, across which the voltage is measured. and the voltage becomes the signal sent to the control circuit.

For magnetron tubes of the type equipped with permanent magnets, the embodiments shown in FIGS. A more detailed explanation will be provided using this as a reference.

FIG. 1 is a schematic circuit diagram of two or more magnetrons 1, 2 of the type mentioned above. Contains. These magnetrons are supplied with power from the power supply 3, and this The power source is common to all magnetrons and includes a transformer and a rectifier. electric The output voltage of the source device 3 is, for example, 6 to 4 KV.

In the embodiment of FIG. 1, two magnetoelectrics t1.2 are connected in parallel to the power supply 3. Ru. The anode 4 of the magnetron 1.2 is grounded. As shown in Figure 1, some The magnetic tube is connected to the two magnetic tubes 1.2 and conductors 7 and 8 to the conductor 5.6 shown by the broken line. can be connected in the same way as connected related circuits.

A regulating circuit, indicated by reference numeral 9, is connected separately to each magnetron. adjustment The circuit 9 has the previously mentioned measuring device 10, which flows through the respective conductors 11, 12. It operates to measure the anode current. As mentioned earlier, the measuring device is preferably It has a resistance value (R), and the voltage applied to the conductors 13, 14; 15, 16 at both ends is measured. be done. These conductors are connected to measuring circuits 17; 18, and these circuits are of a suitable type suitable for transmitting said measured value in the form of a voltage to the control circuit 19; Either way, the value is transmitted in analog or digital form.

The measuring device is electrically separated from the control circuit 19, 20 by circuits 21 and 22. ing. This circuit can take many different forms. However, this time The common features of both types of circuits are the circuit 21; 22 is an analog digital circuit; converter or digital-to-analog converter, e.g. frequency-to-voltage converter. , the transducers are electrically isolated from each other.

In the embodiment shown in FIG. 7, the original switch is used.

In this case, the circuits 21; 22 have a voltage/frequency converter 80, which can e.g. For a light emitting element 81 such as a photodiode, the light emitting element receives a voltage applied to the converter 80. It is driven to emit light pulses with a repetition frequency corresponding to the pressure. Circuit 21; 22 also includes a frequency-to-voltage converter 82, including, for example, a phototransistor. A light emitting element 83 like the one shown in FIG. This light is then converted into an electrical pulse corresponding to the received light pulse. The converter 82 is The received pulse, for example, corresponds to the voltage applied to the first transducer mentioned above. Convert to voltage. The light is transmitted within a light guide 84, such as plastic or glass fiber. 81 and 83.

In a second embodiment of the above-described device for converting voltage into frequency, a transformer is used instead. It is connected to the primary winding, and this secondary winding is connected to a device that converts frequency to voltage. The output voltage of is sent to the control circuits 19 and 20.

The control circuit 19.20 controls the anode current of the magnetic tube 1.2 in response to the signal from the measuring device 10. It is configured to be controlled by The control device 19.20 is preferably a microprocessor. The system consists of a processor or equivalent device, which includes the The control value or setting value is inserted. 23° conductor leading to each power supply 24; the voltage applied to 23, 25 is also supplied to the control circuit. The control circuit will be explained later. I11 is configured to calculate the product of the voltage at the electrode and the anode current, and this product is This is a relatively highly accurate measurement of the output from each magnetron. The efficiency of magnetic tube is It is about 70%.

As you can understand, the anode voltage and anode current diagram of the magnetic tube can be inserted into the control circuit instead. , you can also force the circuit to calculate its current output. Control circuit 19°20 can be of any suitable type and structure. It may be.

The previously mentioned control values are given in the form of electrical signals. The signal is preferably the desired anode current measurement. Configure constant values. On the other hand, this signal is the space or area in which the magnetron generates its output. It may also be an output signal from a temperature sensor placed within the area, in which case temperature control is actually executed by its output. Reference number 26; 27 is the control value in the control circuit. It shows a configuration device for sending. It is understood that this equipment It has an overall control system in the form of a motor or similar device, which includes a control circuit for all magnetic tubes. roads are connected.

The control circuit therefore receives the control value from the device 26; 27 and the actual value from the measuring circuit 17; The measured value or true value is input. The control circuit 19; 20 is controlled via conductors 28; 29. The control signal is output to the adjustment circuit, and this adjustment circuit outputs the anode current. It includes a control device 20; 31 for direct control.

Control devices can take a variety of different forms.

According to the first submitted embodiment, the control device 30; 31 is configured as shown in FIG. It consists of a peak voltage device 85.

This device is connected between the power supply device 3 and the measuring device 10, and is connected to the magnetic tubes 1 and 2. For example, a voltage of 200 to 800 V can be added to the output voltage from the power supply device and supplied. It is configured to

The peak voltage device consists of a transformer 32 with a rectifier bridge 33; One diagonal point is indicated by the reference numbers 24.34; 25,35 in Figures 1 and 2. connected to the line. The other diagonal point of the rectifier bridge 33 is the secondary of the transformer 32. connected to the winding.

The primary winding of the transformer is connected to a thyristor 36, triac or similar element. This supplies the peak voltage device via its terminals 37.38. Controls the phase angle of the power supply. For example, the peak voltage device is supplied with an alternating current of 380v. is being paid.

The semiconductor element 36 is a so-called SCR (SCR). fier silicon controlled rectifier).

The thyristor 36 is connected to the control circuit 19 via control conductors indicated by reference numbers 28 and 29. ; directly controlled from 20.

A choke 43 or magnetic leakage transformer is connected in series with the thyristor 36.

In the second embodiment shown in Figure 3, the same numbers as in Figures 1 and 2 are used. However, here again a peak voltage device 86 is used, which connects transformer 39 and It has a first rectifying bridge 40 connected to the secondary winding of 39. chopper 5 4 or a similar circuit is connected in parallel with the second rectifier bridge 41 to Passer 54 is for supplying high frequency, for example 20KHz, to the primary winding of the transformer. be. Therefore, the chopper 54 is for performing so-called primary switch control. . A capacitor 42 is connected in parallel with the second rectifier bridge 41.

For example, an alternating current with a voltage of 380v is applied to terminal 44.4 of the second rectifier bridge. It is supplied via 5.

The chopper is controlled directly from the control circuit 19; 20 via control lines 28; 29. . The output voltage from the first rectifier bridge 40 is, for example, 200-800v.

By generating high frequency through the DC voltage repeater according to this embodiment, high voltage can be generated. voltage is generated using a smaller transformer core 39 than that used in the embodiment shown in FIG. can.

According to the third embodiment shown in FIG. The peak voltage device in this case is designed to output a higher voltage than the The position is configured to reduce the voltage applied to the magnetron.

A transistor switch 44 or equivalent device connects the power supply and each of the aforementioned measurement devices. 10, and each transistor switch has a respective The peak voltage device prevents the anode current flowing through the magnetic tube from reducing the voltage of the power supply. The anode current is configured to be controlled in a direction that limits it compared to when it is controlled to has been done. Transistor switch 44 flows through secondary winding 45 of transformer 46. Controlled by a control current, the primary winding 47 of the transformer is passed through control conductors 28; 29. Current is supplied from control circuits 19 and 20.

The purpose of the transformer 46 is to operate the high voltage side transistor switch 44 at a low voltage. This is to separate the control circuit 9 from the control circuit 9.

The choke 48 and the diode 49 connected in parallel to the choke have an anode current that changes over time. This prevents them from increasing together.

Accordingly, the features common to the embodiments illustrated with reference to FIGS. For two or more magnetrons with magnets, each magnetron has an inexpensive and simple The point is that power can be supplied from a common power supply simply by connecting the peak voltage device. P The voltage device influences the output of each magnetron to be controlled and the current output of the other magnetron. can be controlled to the desired value without having to give

A filament transformer 50;51 is also connected to each magnetron in a conventional manner. These transformers are powered by power sources 52 and 53.

If the magnetic field of the magnetron is of the type generated by a magnetic winding or coil, each magnetron has a is equipped with a separate magnetizing device, which is connected to said winding and controlled by a control circuit. The magnetic field in the magnetron is controlled, and the anode electrode of the magnetron is controlled under the operating voltage of the magnetron. The flow is set to a predetermined value.

One example of such a configuration is shown in FIG. Figure 1 with the elements in Figure 5 Like elements in FIGS. 4 through 4 are designated with the same reference numerals. In other words, in Figure 5 The embodiment includes a power supply 3 and conductors 7,8. Measuring device 10, measuring circuit 17; 1B, circuits 21; 22 and control circuits 19; 20 and devices 26; 27 are It is constructed in a similar manner as described.

The magnetron 60.61 has a grounded anode 62.63. Magnetic tube 60.61 is magnetic It is equipped with a magnetic winding 64,65 having a magnet for generating a magnetic field within the tube. Ru. Also, this type of magnetic tube may be equipped with a permanent magnet, but this magnet is The body is not capable of generating a magnetic field strong enough to generate microwaves. .

Each magnetic tube is provided with an individual magnetization bag fft66;67 for magnetization. , said device is a current supply device for supplying current to the magnetic windings 64; 65.

As mentioned at the beginning, the anode voltage/anode current curve rises and falls depending on the strength of the magnetic field. subordinate According to this example, the voltage applied to the magnetic tube is approximately constant, but the output of It is controlled by lowering and raising the curve. This means that the current flowing through the magnetic winding This is achieved by adjusting the flow.

As in the previously described embodiments, the control circuits 19 and 20 contain control values or set values and actual measured values. The value is entered. The control circuit 19.20 in this embodiment is connected to the magnetization device 166; A temperature control signal is output through conductors 68 and 69, and the voltage applied to the magnetic tube is The magnetic field of the magnetic field tube is such that the anode current of the field field tube becomes a predetermined value under the following conditions. Control the magnetization device to set the field strength.

The magnetizing device 66,67 is a rectifier and a current regulator, such as a transistor or equivalent. It is composed of Gomotoko.

The transistor or its equivalent is controlled by said control signal.

Any circuit suitable for the purpose can be used.

Magnetizers 66 and 67 are connected to voltage sources 72 and 73 via transformers 10 and γ1. For example, an alternating current with a voltage of 680V is supplied.

In the embodiment shown in the lower part of FIG. 5, the magnetizing winding 64 is connected to the anode T5 of the magnetron tube 60. It is separated from the conductive wire 14 that is connected to the conductor 14.

According to another embodiment shown in the upper part of FIG. It is connected in series to a conducting wire 77 connected to the anode of No. 1. 76 on the volume and the positive sign of the magnetron tube. A grounding point 19 is arranged between the anode 63 and the anode 63 to maintain the anode 63 at ground potential. ing.

Although Figure 5 shows two different types of volatiles, they are all powered by the same power supply. It is preferable that the magnetron windings and control circuits used in all magnetrons be of the same type. stomach. More magnetrons, clearly equipped with control circuits, are shown in dashed lines in Figure 5. It can be connected in parallel to a power supply device via conductors 5 and 6.

It will also be understood that the output of each magnetron is individually and controlled by each control circuit and each magnetization device without affecting the I can control it.

The invention therefore solves the problem mentioned in the first introduction for two or more magnetrons. At the same time, the anode current of each magnetic tube was measured on the high voltage side using a common power supply. The solution is by using individual tubes to control the temperature. individual control circuits The cost is only a fraction of the cost of the power supply.

The present invention can be particularly effectively applied to a heating device that uses a combination of a large number of magnetron tubes. single In addition to requiring only one power supply, the present invention has the following advantages: In other words, the weight of the device and the equipment required for its installation are less than conventional devices. r < 1, and at the same time the volume of the device according to the invention does not require multiple power supplies. The advantage is that it is relatively small. The amount of wiring material required is also greatly reduced.

Another advantage of the present invention is that for large-scale installations, the dimensions of the power supply can be reduced to In other words, 911 IRF can supply power to many magnetic tubes if 2 to 4 magnetic tubes are used. This is a point that can be determined. In this case, all magnetic tubes operate during normal operation. Not that I'm doing it. If you need to replace a magnetron, shut it down. stops and activates another, previously inoperative magnetron tube, producing microwave output. bring to life

Another advantage of the invention is the individual control), since the anode current is measured Electrical tubes are controlled to compensate for aging, for example.

Several embodiments have been described which illustrate the invention. For clarity, given as an example Circuits and components may be replaced or modified by those familiar with this technical field. In addition, each magnetron can be controlled individually by measuring the anode current on the high voltage side. The same functionality could be achieved without departing from the basic concept of

Accordingly, the present invention may be modified from the embodiments described above as may be modified within the scope of the following claims. It is not limited by.

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Claims (1)

[Claims] 1. Control of magnetrons regarding microwave output in equipment equipped with a large number of magnetrons. A method for carrying out a method comprising: two or more magnetrons (1, 2; 60, 61); are connected to one power supply (3) that generates the high voltage to operate the magnetic tube. Continuation: Connect each magnetron (1, 2; 60, 61) to the high voltage side of each magnetron. a separate regulating circuit (9) with a measuring device (10) for measuring the anode current of connection; and said measuring device (10) is electrically separated from the control circuit (19; 20). and the control circuit adjusts the magnetron positive in response to the signal generated by the measuring device. The method for controlling a magnetron, characterized in that it is configured to control a polar current. . 2. A type of magnetron tube in which the magnetic field of the magnetron tube is generated solely by a permanent magnet is used. The method according to claim 1, in which the output voltage of the power supply device (3) is In addition, a power supply device and the measuring device (10 ) and apply further voltage using a peak voltage device (85; 86) connected between A method for controlling a magnetron, characterized by: 3. In the method according to claim 2, the peak voltage device (85) is The transformer (32) has a rectifying bridge (33) controlled by phase angle control. In the phase angle control, a thyristor connected to the primary winding of the transformer (32) is used. A magnetoelectric device characterized in that a pair (36) or its equivalent is controlled. How to control the tube. 4. In the method according to claim 2, the peak voltage device (86) comprises A transformer with a first rectifying bridge (40) controlled by a loose primary switch control (39), and in the primary switch control, the primary winding of the transformer (39) is by a chopper (54) or equivalent connected in parallel to the rectifier bridge (41) of 2. The generated high frequency is supplied and the chopper (54) is controlled. A method for controlling magnetic tubes. 5. A type of magnetron tube in which the magnetic field of the magnetron tube is generated solely by a permanent magnet is used. In the method according to claim 1, the power supply device (3) comprises magnetic tubes (1, 2). to generate a voltage higher than the highest voltage required by each magnetic tube; In this current switch control, the transistor A power switch (44) or equivalent is connected to the power supply (3) and each of the measuring devices (10). ), the transistor switch (44) or its equivalent, be controlled to limit the anode current flowing through each magnetron (1, 2); A magnetic tube control method characterized by: 6. Using a type of magnetron where the magnetic field of the magnetron is generated by a magnetic winding or coil In the method according to claim 1, each winding of each magnetron (60; 61) Connect individual magnetizing devices (66; 67) to the wires (64; 65); The position is controlled by the control circuit (19; 20), and the strength of the magnetic field in each magnetron is controlled by the control circuit (19; 20). However, under the current magnetron driving voltage, the anode current of the magnetron is predetermined. 1. A method for controlling a magnetron tube, characterized in that the magnetron is controlled to a desired value. 7. A method according to claim 6, in which the anode current is applied to the magnetic winding (64). A method for controlling a magnetron tube, characterized in that the magnetron tube is passed through a conducting wire (74) separated from the . 8. In the method according to claim 6, the anode current is used to magnetize the magnetron (61). A magnetron tube control method characterized by passing through a part (76) of a winding. 9. A method according to any one of the preceding claims, in which the measuring device (10) has a resistance (R) and the voltage across it is measured. Method. 10. In addition to the presence of a large number of magnetic tubes, magnetic tube control is performed regarding microwave output. In the apparatus for operating the magnetron tubes (1, 2; 60, 61), Two or more magnetic tubes (1, 2; 60, 61) are connected in parallel. each magnetron tube (1, 2; 60, 61) has a connected power supply (3); Measure the anode current on the high voltage side of each magnetron (1, 2; 60, 61) A separate regulating circuit (9) with a measuring device (10) installed to the measuring device (10) is electrically isolated from the control circuit (19; 20) and The control circuit (19; 20) is associated in response to a signal from the measuring device (10). A magnetron tube control configured to control an anode current of a magnetron tube. Device. 11. Uses a type of magnetic tube in which the magnetic field of the magnetic tube is generated solely by a permanent magnet In the device according to claim 10, each magnetron tube (1, 2) has an individual Another peak voltage device (85; 86) is connected, said peak voltage device A peak voltage device (85; 6) is an additional voltage in addition to the voltage supplied from the power supply to the magnetic tubes (1, 2). A magnetron tube control device configured to apply a voltage of . 12. The device according to claim 11, wherein the peak voltage device (85) is a transformer (32) having a current bridge (33); a primary winding of the transformer (32); is connected to a thyristor pair (36), a triax or equivalent element, thereby A magnetron tube control device characterized in that phase angle control is executed. 13. The device according to claim 11, wherein the peak voltage device (86) a transformer (39) with one rectifier bridge (40); a chopper (54) or The equivalent circuit is connected in parallel to the second rectifying bridge (41), and said chopper is a transformer. A high frequency is supplied to the primary winding of the device (39) to perform so-called primary switch control. A magnetron tube control device characterized in that the magnetic tube control device is arranged in such a manner that the 14. Uses a type of magnetic tube in which the magnetic field of the magnetic tube is generated solely by a permanent magnet In the method according to claim 1, the power supply device (3) comprises magnetrons (1, 2). ) is configured to generate a voltage higher than the highest voltage required by the transistor; - A switch (44) or similar element is connected between the power supply (3) and each of said measuring devices. each transistor switch (44) is connected between a respective magnetron (1 , 2), which is controllable to limit the anode current flowing through the magnetoelectric device. Pipe control device. 15. A magnetron of the type in which the magnetic field (60, 61) of the magnetron is generated by a magnetic winding is In the method according to claim 10 used, each winding (64; 65) has a A separate magnetization device (66; 67) is connected to the magnetic tube (60; 61); 9; 20) tells the magnetizing device that the strength of the magnetic field inside the magnetron tube (60; 61) is The anode current flowing through the magnetron (60; 61) under the magnetron driving voltage of A magnetron tube control device characterized by being connected and arranged so that a predetermined value is obtained. Place. 16. 15. The device according to claim 15, wherein the magnetic winding (64) is a magnetron (64). 60) is insulated from the conductive wire (74) connected to the anode of Electrical tube control device. 17. The device according to claim 15, in which a portion (76) of the magnetic winding is It is connected in series with the conductor (27) connected to the anode (63) of the electric tube (61) 4). A magnetron control device characterized by: 18. In the apparatus according to any one of claims 10 to 17, the measurement characterized in that the device (10) has a resistor (R) across which the voltage is measured; magnetron control device. 19. A device according to any of the preceding claims, wherein the circuit (21; 22) Provided between each measuring device (10) and each control circuit (19; 20) The circuit includes a voltage/frequency converter (18) and a frequency/voltage converter (82). characterized in that the transducers (18; 82) are electrically isolated from each other. magnetron control device.