JP2016015831A - Power supply device for electronic tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device for electronic tube capable of solving the problem of power loss due to a resistor for energy absorption and the problem of upsizing of the device.SOLUTION: A power supply device for electronic tube includes a transformer 312 consisting of a first winding connected between a first switch 301 and an electronic tube 4, and a second winding having one end connected with the output end (a) of a rectifying and smoothing circuit 2 and the other end connected with the output end b of the rectifying and smoothing circuit 2, reflux means 322 connected in parallel with the first winding, a second switch 33 having one end connected with one end of the second winding and the other end connected with the other end of the second winding, first current regulation means 333 for regulating a current flowing from one end of the second winding and one end of the second switch 33 toward the output end (a), and a control section 501 for controlling the first switch 301 and second switch 33.

Description

  The present invention relates to an electron tube power supply device.

  In general, plasma heating devices used in nuclear fusion experiments and the like are pulsed high-frequency with a high-power electron tube (gyrotron) used as a high-power high-frequency generator to investigate the thermal conductivity evaluation and confinement performance of plasma. In some cases, the pulsed high-frequency wave is incident on the plasma (see, for example, Non-Patent Document 1). In this case, the electron tube power supply device performs a pulse operation for supplying a pulsed voltage to the high-power electron tube.

  FIG. 6 shows a conventional electron tube power supply device 1B that performs pulse operation. As shown in the figure, the electron tube power supply device 1B includes a rectifying / smoothing circuit 2 (rectifier 201, smoothing reactor 202, braking resistor 203, and smoothing unit) that rectifies and smoothes the AC voltage of the AC power source 101 boosted by the transformer 102. A capacitor 204), a DC high voltage switch 302, a current limiting circuit in which a reactor 311 for suppressing a short circuit current and a resistor 321 for energy absorption are connected in parallel, and a control unit 502 for controlling the DC high voltage switch 302; It has. Note that the DC high-voltage switch 302, the short-circuit current suppressing reactor 311 and the energy absorbing resistor 321 have the input side of the electron tube power supply device 1B as one end and the output side of the electron tube power supply device 1B as the other end. To do.

  The high power electron tube 4 includes a cathode 401 and an anode 402 for generating an electron beam, and a collector 403 for capturing the generated electron beam. While the collector 403 is grounded and the DC high-voltage switch 302 is in an ON state, a negative voltage is supplied to the cathode 401 from the electron tube power supply device 1B, and the negative voltage is applied to the anode 402 through a resistor. A voltage divided by an anode voltage divider including 421 and a resistor 422 is supplied.

FIG. 7 shows voltage waveforms and current waveforms of the respective portions of the electron tube power supply device 1B during pulse operation. In the figure, v _K is the voltage of the cathode 401 relative to the voltage of the collector 403, v _S1 is a voltage of the other end relative to the voltage of one end of the DC high voltage switch 302, v _R is the resistor for energy absorption The voltage at one end with reference to the voltage at the other end of 321, i _K is the current of the cathode 401, and i _L is the current of the reactor 311 for suppressing the short-circuit current. For i _K, direction as positive toward the cathode 401 from the output of the electron tube power supply apparatus 1B, for i _L is a direction toward the one end from the other end of the reactor 311 for short-circuit current suppressing positive. Further, the rated output voltage of the electron tube power supply device 1B is set to -A [V], and the capacity of the smoothing capacitor 204 is sufficiently large.

Before the time t _21, the DC high voltage switch 302 is turned off under the control of the controller 502. Prior to time t ₂₁ , −A [V], which is a voltage across the output terminals of the rectifying and smoothing circuit 2 (a voltage across the smoothing capacitor 204), is applied to one end of the DC high-voltage switch 302. v _S1 is + A [V].

When the control unit 502 switches the DC high voltage switch 302 from the OFF state to the ON state at time t ₂₁ , the voltage −A [V] output from the rectifying and smoothing circuit 2 is supplied to the cathode 401 of the high power electron tube 4. Therefore, the voltage v _{K of the} cathode 401 rises to −A [V]. Further, the current i _{K of the} cathode 401 also rises according to the voltage v _K of the cathode 401.

Then, at time t _22, the control unit 502 switches to the OFF state DC high voltage switch 302 from the ON state, since the voltage output from the rectifying and smoothing circuit 2 is not supplied to the cathode 401, the voltage of the cathode 401 v _K And the current i _K falls.

  As described above, the control unit 502 switches the DC high voltage switch 302 between the off state, the on state, and the off state, so that one pulse voltage and one pulse current are supplied to the high power electron tube 4. Therefore, according to the electron tube power supply device 1B, the pulsed voltage can be repeatedly supplied to the high power electron tube 4 by repeatedly switching the DC high voltage switch 302 between the on state and the off state.

Masayuki Teramon and seven others, “Output Modulation Operation by Anode Voltage Control in Gyrotron for JT-60U ECH Device”, Japan Atomic Energy Research Institute Research Report, JAERI-Tech 2003-053, (2003), p. 1-25

However, in the conventional electron tube power supply device 1B, when the control unit 502 switches the DC high-voltage switch 302 from the on state to the off state, the current i _L flowing through the reactor 311 flows through the energy absorbing resistor 321 and heat. Since it is consumed as energy, there is a problem that power loss becomes excessive.

  Further, in the conventional electron tube power supply device 1B, the energy absorbing resistor 321 is large (for example, 100 kW class), and a cooling system for the resistor 321 is required. There was also a problem of end.

Further, when the current i _{L of the} reactor 311 flows through the energy absorbing resistor 321, a voltage drop occurs in the resistor 321, and the voltage v _R of the resistor 321 increases. For this reason, the DC high voltage switch 302 immediately after switching from the on state to the off state is applied with -A [V], which is the voltage between the output terminals of the rectifying and smoothing circuit 2, at one end and the resistor 321 at the other end. The voltage v _R is applied. As a result, the voltage v _S1 of the DC high-voltage switch 302 immediately after switching from the on state to the off state increases to about +2 A [V] as shown in FIG.

  In this way, in the conventional electron tube power supply device 1B, an excessive voltage is applied to the DC high voltage switch 302 immediately after switching from the ON state to the OFF state, and the operation duty of the DC high voltage switch 302 becomes heavy. It has been necessary to increase the number of switching elements constituting the high voltage switch 302 or to increase the size of the insulator included in the DC high voltage switch 302. As a result, the conventional electron tube power supply device 1B has a problem that the overall size of the device is increased. In the conventional electron tube power supply device 1B, the DC high voltage switch 302 has a structure in which about 100 IGBT (Insulated Gate Bipolar Transistor) elements are connected in series.

  The present invention has been made in view of the above circumstances, and an object thereof is an electronic device capable of solving the problem of power loss caused by the energy absorbing resistor and the problem of the enlargement of the apparatus. The object is to provide a power supply device for a tube.

  In order to solve the above problems, an electron tube power supply device according to the present invention is an electron tube power supply device that rectifies and smoothes an input AC voltage with a rectifying and smoothing circuit including a smoothing capacitor and supplies the rectified smoothing circuit to the electron tube. Is connected to the output terminal on the high voltage side of the rectifying and smoothing circuit, the first winding having one end connected to the other end of the first switch and the other end connected to the electron tube, and one end rectified A transformer comprising a second winding connected to the output terminal on the high voltage side of the smoothing circuit and the other end connected to the output terminal on the low voltage side of the rectifying and smoothing circuit, and connected in parallel to the first winding A recirculation means for recirculating the current flowing through the first winding; a second switch having one end connected to one end of the second winding and the other end connected to the other end of the second winding; From one end of the line and one end of the second switch Wherein the first current regulating means for regulating the current flowing toward the output end of the pressure side, and a control unit for controlling the first switch and the second switch, further comprising a.

  In the electron tube power supply device, the first switch and the second switch that are switched by the control unit are in a first mode in which the first switch and the second switch are turned on, and in a state in which the first switch is turned off. It is preferable that the second mode in which the second switch is turned on and the third mode in which the first switch and the second switch are turned off are included.

  The controller in the electron tube power supply device changes from the first mode to the second mode before the current flowing through the second winding becomes zero after the state of the first switch and the second switch is set to the first mode during the pulse operation. It is preferable to switch in the order of the mode and the third mode.

  The first current regulating means in the electron tube power supply device includes a rectifying / smoothing circuit such that the anode is connected to the output terminal on the high voltage side of the rectifying / smoothing circuit and the cathode is connected to one end of the second winding. A diode interposed between the output terminal on the high voltage side and one end of the second winding may be used.

  The second switch in the electron tube power supply device includes a second active switch element controlled by the control unit, and a current flowing from one end of the second winding to the other end of the second winding via the second active switch element. You may have the 2nd electric current control means which regulates.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply device for electron tubes which can eliminate the problem of the power loss resulting from the resistor for energy absorption, and the problem of the enlargement of an apparatus can be provided.

It is a circuit diagram of the power supply device for electron tubes concerning this invention. It is a figure which shows operation | movement of the power supply device for electron tubes which concerns on this invention at the time of a pulse driving | operation. It is a figure which shows the voltage waveform and current waveform of each part of the power supply device for electron tubes which concerns on this invention at the time of a pulse driving | operation. It is a figure which shows operation | movement of the power supply device for electron tubes which concerns on this invention at the time of direct current | flow operation. It is a figure which shows the voltage waveform and current waveform of each part of the power supply device for electron tubes which concerns on this invention at the time of direct current | flow operation. It is a circuit diagram of the conventional power supply device for electron tubes. It is a figure which shows the voltage waveform of each part of the conventional electron tube power supply device at the time of pulse operation, and a current waveform.

  Embodiments of an electron tube power supply device according to the present invention will be described below with reference to the accompanying drawings.

[Configuration of power supply unit for electron tube]
FIG. 1 shows a power supply device 1A for an electron tube according to an embodiment of the present invention. As shown in the figure, the electron tube power supply device 1A according to the present embodiment supplies the high voltage electron tube (gyrotron) 4 with rectified and smoothed AC voltage of the AC power source 101 boosted by the transformer 102. Is.

  The high power electron tube 4 includes a cathode 401 and an anode 402 for generating an electron beam, and a collector 403 for capturing the generated electron beam. The collector 403 is grounded, and a negative voltage is supplied to the cathode 401 from the electron tube power supply device 1A while the first DC high-voltage active switch 301 described later is in an on state, and the anode 402 has the negative voltage. Is divided by an anode voltage divider including a resistor 421 and a resistor 422.

  The electron tube power supply device 1 </ b> A includes a rectifying / smoothing circuit 2 that rectifies and smoothes the AC voltage of the AC power supply 101 boosted by the transformer 102. The rectifying / smoothing circuit 2 includes a rectifier 201 connected to the secondary side of the transformer 102, a smoothing reactor 202 having one end connected to the anode side of the rectifier 201, and a braking having one end connected to the other end of the smoothing reactor 202. A resistor 203 and a smoothing capacitor 204 having one end connected to the other end of the braking resistor 203 and the other end connected to the cathode side of the rectifier 201 are provided. In the present invention, the output terminal “a” of the rectifying / smoothing circuit 2 that is a negative voltage is the output terminal on the high voltage side, and the output terminal “b” of the grounded rectifying / smoothing circuit 2 is the output terminal on the low voltage side.

  The electron tube power supply device 1A includes a first DC high-voltage active switch 301 corresponding to the first switch of the present invention, a transformer 312 for suppressing a short-circuit current, and a free-wheeling diode 322 corresponding to the reflux means of the present invention. The second DC high voltage switch 33 corresponding to the second switch of the present invention and the energy regeneration diode 333 corresponding to the first current regulating means of the present invention are provided. The second DC high voltage switch 33 includes a second DC high voltage active switch 331 corresponding to the second active switch element of the present invention and a backflow preventing diode 332 corresponding to the second current regulating means of the present invention. .

  The first DC high-voltage active switch 301 has one end connected to the output end a of the rectifying and smoothing circuit 2 and the other end connected to the cathode 401 of the high-power electron tube 4 via the first winding of the transformer 312 for short-circuit current suppression. It is connected to the. The first DC high voltage active switch 301 has a structure in which a plurality of switching elements (for example, IGBT elements) are connected in series.

  The transformer 312 for suppressing the short-circuit current has a first winding having one end connected to the other end of the first DC high-voltage active switch 301 and the other end connected to the cathode 401 of the high power electron tube 4, and one end A second winding connected to the output terminal a of the rectifying / smoothing circuit 2 via the diode 333 for energy regeneration and having the other end connected to the output terminal b of the rectifying / smoothing circuit 2 and the collector 403 of the high-power electron tube 4; It is equipped with. The turn ratio between the first winding and the second winding is 1: 1.

  The free-wheeling diode 322 has an anode connected to the other end of the first DC high-voltage active switch 301 and a cathode connected to the other end of the first winding of the transformer 312. The return diode 322 returns the current flowing through the first winding of the transformer 312.

  The second DC high-voltage active switch 331 has one end connected to one end of the second winding of the transformer 312 via the backflow prevention diode 332 and the other end connected to the other end of the second winding of the transformer 312. It is connected to the. Since the turns ratio of the first winding and the second winding of the transformer 312 is 1: 1, the second DC high voltage active switch 331 is the same as the first DC high voltage active switch 301. Can be used. In other words, the first DC high voltage active switch 301 and the second DC high voltage active switch 331 can have the same number of switching elements and the same amount and size of insulators.

  The reverse current prevention diode 332 has a second DC high voltage active so that the anode is connected to one end of the second DC high voltage active switch 331 and the cathode is connected to one end of the second winding of the transformer 312. It is interposed between one end of the switch 331 and one end of the second winding. The backflow preventing diode 332 regulates the current flowing from one end of the second winding of the transformer 312 to the other end of the second winding via the second DC high voltage active switch 331.

  The diode 333 for energy regeneration has an output terminal a of the rectifying and smoothing circuit 2 such that an anode is connected to the output terminal a of the rectifying and smoothing circuit 2 and a cathode is connected to one end of the second winding of the transformer 312. And one end of the second winding. The energy regenerative diode 333 regulates a current flowing from one end of the second winding of the transformer 312 and one end of the second DC high-voltage active switch 331 toward the output end a of the rectifying and smoothing circuit 2.

  The electron tube power supply device 1 </ b> A includes a control unit 501 that controls the first DC high-voltage active switch 301 and the second DC high-voltage active switch 331. The control unit 501 switches the state of the first DC high voltage active switch 301 and the second DC high voltage active switch 331. The first DC high voltage active switch 301 and the second DC high voltage active switch 331 are in the first mode in which the first DC high voltage active switch 301 and the second DC high voltage active switch 331 are turned on, The second direct current high voltage active switch 331 is turned on while the first direct current high voltage active switch 301 and the second direct current high voltage active switch 331 are turned on. And a third mode in an off state.

[Operation of power supply unit for electron tube]
The electron tube power supply device 1 </ b> A performs a pulse operation for supplying a pulsed voltage to the high-power electron tube 4 and a DC operation for supplying a continuous non-pulsed voltage to the high-power electron tube 4.

(Pulse operation)
FIG. 2 shows the operation of the electron tube power supply device 1A during pulse operation, and FIG. 3 shows the voltage waveform and current waveform of each part of the electron tube power supply device 1A during pulse operation.

In FIG. 3, v _K is the voltage of the cathode 401 based on the voltage of the collector 403, and v _S1 is the other end of the first DC high voltage active switch 301 based on the voltage of one end of the first DC high voltage active switch 301. , V _S2 is the voltage at the other end of the second DC high voltage active switch 331 based on the voltage at one end of the second DC high voltage active switch 331, i _K is the current at the cathode 401, and i _L is the transformer 312. , I _S2 is the current of the second DC high-voltage active switch 331, and i _S3 is the current of the energy regenerating diode 333. For i _K and i _S3 , the direction from the input side to the output side of the electron tube power supply device 1A (the direction from the left to the right in FIG. 2) is positive, and for i _L and i _S2 , the electron tube power supply device The direction from the output side of 1A toward the input side (the direction from right to left in FIG. 2) is positive. The rated output voltage of the electron tube power supply device 1A is -A [V], and the capacity of the capacitor 204 is sufficiently large.

As shown in FIG. 3, is before time t _1, the first high DC voltage active switch 301 and a second high voltage DC active switch 331 under control of the control unit 501 are turned off (third mode ). Since -A [V], which is the voltage at the output terminal a of the rectifying and smoothing circuit 2, is applied to one end of the first DC high-voltage active switch 301, the voltage _vS1 becomes + A [V].

When the control unit 501 switches the state of the first DC high voltage active switch 301 and the second DC high voltage active switch 331 to the first mode at time t ₁ , −A is output from the output terminal a of the rectifying and smoothing circuit 2. since the voltage of [V] is supplied to the cathode 401 of the high power electron tube 4, the voltage _{v K} of the cathode 401 rises until -A [V]. Further, as shown in FIG. 2A, a current path from the cathode 401 to the collector 403 via the first winding of the transformer 312, the first DC high voltage active switch 301, the smoothing reactor 202, and the rectifier 201 is provided. As a result, the current i _{K of the} cathode 401 also rises.

Furthermore, when current i _L flows through the first winding of transformer 312, current also flows through the second winding of transformer 312. The current of the second winding returns to the second winding through the second DC high voltage active switch 331 and the reverse current prevention diode 332. The current i _L of the first winding hardly attenuates once it rises because the capacity of the smoothing capacitor 204 is sufficiently large, but the current of the second winding (current i _S2 flowing through the second DC high-voltage active switch 331) is The second direct current high voltage active switch 331 and the backflow prevention diode 332 rise due to a voltage drop due to the on resistance, and then attenuate.

When the control unit 501 switches the state of the first DC high voltage active switch 301 and the second DC high voltage active switch 331 from the first mode to the second mode at time t ₂ , the output from the output terminal a of the rectifying and smoothing circuit 2 is performed. Since the voltage of −A [V] is not supplied to the cathode 401, the voltage v _K and the current i _K of the cathode 401 fall.

At time t ₃ , the voltage v _K and current i _K of the cathode 401 become zero, and all of the current i _L of the first winding circulates through the free-wheeling diode 322 (see FIG. 2B). Note that the current i _L of the first winding that circulates attenuates at substantially the same attenuation rate as the current of the second winding.

In the second mode after time t ₃ , −A [V], which is the voltage at the output terminal a of the rectifying and smoothing circuit 2, is applied to one end of the first DC high-voltage active switch 301, so that the voltage v _S1 is + A [ V].

At time t _4, flows controller 501 when the state of the first high DC voltage active switch 301 and a second high voltage DC active switch 331 is switched from the second mode to the third mode, the second DC high voltage active switches 331 While the current i _S2 and the current i _L of the first winding rapidly decrease toward zero, the voltage at one end of the second DC high-voltage active switch 331 drops, and the current i _S3 is supplied to the energy regeneration diode 333. Start flowing. This current i _S3 is regenerated to the smoothing capacitor 204 via the second winding of the transformer 312 as shown in FIG. That is, the electromagnetic energy generated in the transformer 312 is regenerated in the smoothing capacitor 204.

At time _{t 5,} while the current _{i L} of the second high voltage DC active switch 331 current _{i S2} and the first winding through the becomes zero, current _{i S3} through the diode 333 for energy recovery is maximized, the The voltage v _S2 of the two direct current high voltage active switch 331 is + A [V]. After that, the current i _S3 of the energy regeneration diode 333 decreases, and when the current i _S3 becomes zero at time t ₆ , the voltage v _S2 of the second DC high-voltage active switch 331 decreases from + A [V], and reaches zero at time t ₇ . become. Time t ₇ after the power supply apparatus 1A for an electron tube is the same state as the time t ₁ earlier. Therefore, the time t ₇ after the control unit 501, the state of the first high DC voltage active switch 301 and a second high voltage DC active switch 331 again to the first mode, the current flowing through the second winding of the transformer 312 By repeatedly performing the switching from the first mode to the second mode and the third mode before reaching zero, a pulsed voltage can be repeatedly supplied to the cathode 401 of the high power electron tube 4.

  Eventually, according to the electron tube power supply device 1A, the electromagnetic energy generated in the transformer 312 is regenerated in the smoothing capacitor 204, so that the energy absorbing resistor 321 is unnecessary unlike the conventional electron tube power supply device 1B. . For this reason, in the power supply apparatus 1A for electron tubes, the problem of the power loss resulting from the resistor 321 for energy absorption, and the problem of enlargement of the whole apparatus do not occur.

Further, in the electron tube power supply device 1A, when the first DC high voltage active switch 301 is switched from the ON state to the OFF state, a voltage that greatly exceeds the rated voltage (+ A [V]) is active. Since it is not applied to the switch 301 (see time t _{3 in} FIG. 3), the number of switching elements constituting the first DC high voltage active switch 301 is reduced or included in the first DC high voltage active switch 301. The insulator can be miniaturized. As a result, the electron tube power supply device 1A can be made smaller in size than the conventional electron tube power supply device 1B.

(DC operation)
FIG. 4 shows the operation of the electron tube power supply device 1A during DC operation, and FIG. 5 shows the voltage waveform and current waveform of each part of the electron tube power supply device 1A during DC operation. 5 is viewed in the same way as FIG.

As shown in FIG. 5, it is before the time t _11, the first high DC voltage active switch 301 and a second high voltage DC active switch 331 under control of the control unit 501 are in the OFF state, the first DC Since -A [V], which is the voltage of the output terminal a of the rectifying and smoothing circuit 2, is applied to one end of the high voltage active switch 301, the voltage _vS1 becomes + A [V].

At time _{t 11,} the control unit 501 switches the state of the first high DC voltage active switch 301 and a second high voltage DC active switch 331 to the first mode, the voltage _{v K} of the cathode 401 rises until -A [V] The current i _{K of the} cathode 401 also rises.

Furthermore, when current i _L flows through the first winding of transformer 312, current also flows through the second winding of transformer 312 (see FIG. 4A). Since the current i _L of the first winding is supplied with electric power from the AC power supply 101 via the transformer 102, the rectifier 201 and the smoothing reactor 202, it hardly attenuates once it rises. On the other hand, the current of the second winding (current i _S2 flowing through the second DC high-voltage active switch 331) rose due to a voltage drop due to the on-resistance of the second DC high-voltage active switch 331 and the backflow prevention diode 332. continue to the rear damping, they become zero at time _{t 12} (see FIG. 4 (B)).

At time t _13, the control unit 501 switches to the off state the state of the first high DC voltage active switch 301 from the ON state, the voltage of -A [V] output from the output terminal a rectifying smoothing circuit 2 is a cathode Since it is not supplied to 401, the voltage v _K and current i _{K of} the cathode 401 fall, while the voltage v _{S1 of} the first DC high voltage active switch 301 rises.

At time _{t 14,} the voltage _{v K} and current _{i K} of the cathode 401 becomes zero, the current _{i L} of the first winding are all refluxed through the reflux diode 322 (see FIG. 4 (C)). Note that the current value of the current i _L of the first winding before and after the time t ₁₄ does not change, the current of the second winding remains zero.

At time t ₁₄ , −A [V], which is the voltage at the output terminal a of the rectifying and smoothing circuit 2, is applied to one end of the first DC high voltage active switch 301, so that the voltage v _S1 is + A [V]. Become.

Thus, in the electron tube power supply device 1A, when the first DC high-voltage active switch 301 is switched from the on state to the off state, the voltage that greatly exceeds the rated voltage (+ A [V]) since not being applied to the voltage active switch 301 (see time t ₁₄ in FIG. 5), or reduce the number of switching elements constituting the first high DC voltage active switch 301, the first high DC voltage active switches 301 The contained insulator can be reduced in size. As a result, the electron tube power supply device 1A can be made smaller in size than the conventional electron tube power supply device 1B.

  In the electron tube power supply device 1A during DC operation, the electromagnetic energy generated by the transformer 312 is not normally regenerated by the capacitor 204. However, if the high-power electron tube 4 is short-circuited (in the state of FIG. 4A) before the current flowing through the second winding of the transformer 312 becomes zero, the control unit 501 causes the first DC high voltage active Since the state of the switch 301 and the second DC high voltage active switch 331 is switched in order from the first mode to the second mode and the third mode before the current flowing through the second winding of the transformer 312 becomes zero, the transformer The electromagnetic energy generated in 312 is regenerated in the capacitor 204.

  As mentioned above, although embodiment of the power supply device for electron tubes which concerns on this invention was described, this invention is not limited to the said embodiment.

  Replacement of elements connected in series is considered equivalent. For example, the backflow preventing diode 332 has an anode connected to the other end of the second winding of the transformer 312 and the output end b of the rectifying / smoothing circuit 2, and a cathode connected to the other end of the second DC high-voltage active switch 331. So that the other end of the second winding and the output end b of the rectifying and smoothing circuit 2 are connected to the other end of the second DC high-voltage active switch 331.

In the above embodiment, the transformer 312 having a one-to-one turns ratio of the first winding to the second winding is used, but the turns ratio can be changed as appropriate. Changing the turns ratio, it is possible to lengthen or shorten the regeneration time (time from time t ₄ in FIG. 3 to time t _6).

  In the above embodiment, the return diode 322 is used as the return means. However, if the current flowing through the first winding of the transformer 312 can be returned, the return diode 322 can be used instead. it can.

  In the above embodiment, the diode 333 is used as the first current regulating means. However, the output terminal of the rectifying / smoothing circuit 2 is connected to one end of the second winding of the transformer 312 and one end of the second DC high-voltage active switch 331. Any diode that can regulate the current flowing toward a can be used instead of the diode 333. For example, a switch that is turned off in the first mode and the second mode and turned on in the third mode under the control of the control unit 501 may be used.

  In the above embodiment, the diode 332 is used as the second current regulating means. However, the second current of the transformer 312 is connected to the second DC high-voltage active switch 331 from one end of the second winding of the transformer 312. Any diode that can regulate the current flowing through the other end of the winding can be used instead of the diode 332.

  In the above embodiment, the second DC high voltage switch 33 is configured by the second DC high voltage active switch 331 and the backflow prevention diode 332, but the ON state and the OFF state are controlled under the control of the control unit 501. If the current can be switched and the current flowing from one end of the second winding of the transformer 312 to the other end of the second winding via the second DC high voltage switch 33 can be regulated, the configuration is changed as appropriate. be able to.

  The power supply device for an electron tube according to the present invention can also be applied to an electron tube other than the high power electron tube (gyrotron) 4.

1A Electron Tube Power Supply Device 101 AC Power Supply 102 Transformer 2 Rectifier Smoothing Circuit 201 Rectifier 202 Smoothing Reactor 203 Braking Resistor 204 Smoothing Capacitor 301 First DC High Voltage Active Switch (First Switch)
312 Transformer 322 for suppressing short-circuit current Free-wheeling diode 33 Second DC high-voltage switch (second switch)
331 Second DC high voltage active switch (second active switch element)
332 Backflow prevention diode (second current regulating means)
333 Diode for energy regeneration (first current regulating means)
4 High Power Electron Tube 401 Cathode 402 Anode 403 Collector 421, 422 Resistor 501 Control Unit

Claims (5)

A power supply device for an electron tube that rectifies and smoothes an input AC voltage with a rectifying and smoothing circuit including a smoothing capacitor and supplies the same to an electron tube,
A first switch having one end connected to the output terminal on the high voltage side of the rectifying and smoothing circuit;
A first winding having one end connected to the other end of the first switch and the other end connected to the electron tube, and one end connected to an output end on the high voltage side of the rectifying and smoothing circuit and the other end A transformer comprising a second winding connected to the output terminal on the low voltage side of the rectifying and smoothing circuit;
Recirculation means connected in parallel to the first winding to recirculate the current flowing through the first winding;
A second switch having one end connected to one end of the second winding and the other end connected to the other end of the second winding;
First current regulating means for regulating a current flowing from one end of the second winding and one end of the second switch toward the output terminal on the high voltage side of the rectifying and smoothing circuit;
A control unit for controlling the first switch and the second switch;
An electron tube power supply device comprising: The first switch and the second switch that are switched by the control unit include a first mode in which the first switch and the second switch are turned on, and a state in which the first switch is turned off. 2. The electron tube power supply device according to claim 1, comprising: a second mode in which the second switch is turned on; and a third mode in which the first switch and the second switch are turned off. . In the pulse operation, the control unit sets the state of the first switch and the second switch to the first mode, and then sets the first switch from the first mode before the current flowing through the second winding becomes zero. 3. The electron tube power supply device according to claim 2, wherein the mode is switched in the order of two modes and the third mode. The first current regulating means includes a high voltage of the rectifying / smoothing circuit such that an anode is connected to an output terminal on a high voltage side of the rectifying / smoothing circuit and a cathode is connected to one end of the second winding. The power supply device for an electron tube according to any one of claims 1 to 3, wherein the power supply device is a diode interposed between an output end on the side and one end of the second winding. The second switch includes a second active switch element controlled by the control unit and a current flowing from one end of the second winding to the other end of the second winding via the second active switch element. The power supply device for an electron tube according to any one of claims 1 to 4, further comprising second current regulating means for regulating.

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