JPH05258675A - Beam current breaking circuit - Google Patents

Abstract

PURPOSE:To realize a quick and sure operation control and promote a reduction in size and weight. CONSTITUTION:A triple-pressure rectifying circuit 15 for voltage generation is arranged between an anode electrode 10 and a cathode 13, and the triple- pressure rectifying circuit 15 is controlled to variably control the voltage between the anode electrode 10 and the cathode 13. The anode electrode 10 and a heater cathode electrode 11 are closed, whereby the beam current is interrupted at the time of build-up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam current interruption circuit such as an anode crowbar circuit used in a traveling wave tube power supply device.

[0002]

2. Description of the Related Art Conventionally, this type of beam current cutoff circuit has been designed to cut off an abnormal beam current generated when the power supply device is started up, shut down, or abnormally to prevent the traveling wave tube from being broken. Is used for.

FIG. 3 shows a conventional beam current interruption circuit, in which an anode electrode 1 and a heater cathode (HK) electrode (cathode) 2 are connected via an anode power supply 3. Of these, the heater cathode electrode 2 is an anode (for example, a body)
4 is connected via the body power supply 5. And
A relay 6 is provided between the anode electrode 1 and the heater cathode electrode 2.
Is provided. The relay 6 is selectively controlled to be turned on and off via the control unit 7, and in the off state, the anode electrode 1 is set to the rated voltage by the anode power supply 3 and is turned on at the time of starting, for example. Then, the space between the anode electrode 1 and the heater cathode electrode 2 is closed, and the voltage of the anode electrode 1 is switched to 0 V to cut off the beam current.

However, in the above beam current interruption circuit,
Due to the configuration in which the voltage is switched using the relay 6, the time required for the switching operation is the time T3 which is the sum of the moving time T1 and the chattering time T2 of the relay 6, as shown in FIG. Is difficult to reduce, and at the time of switching on / off of a high voltage accompanying the ON / OFF switching operation of the relay 6, a spark is generated due to a chattering phenomenon, the electrodes of the relay 6 are deteriorated, and noise is generated. Has a problem that it malfunctions. Further, according to this, there is a problem that it is difficult to reduce the size and weight because the relay 6 has to be made larger as the voltage to be turned on and off becomes higher.

[0005]

As described above, in the conventional beam current interruption circuit, the switching operation time is long and
There is a risk of malfunction, and it is difficult to promote downsizing and weight reduction, and there is a problem that it is large and heavy.

The present invention has been made in view of the above circumstances, and is capable of realizing quick and reliable operation control, and
It is an object of the present invention to provide a beam current cutoff circuit that can be made smaller and lighter.

[0007]

According to the present invention, there is provided a first power source for controlling a voltage between an anode and a cathode, a second power source for controlling a voltage between the cathode and a beam control electrode, and the anode and the beam. A beam current cutoff circuit is provided with a voltage generation means provided between the voltage generation means and a control electrode, and a voltage control means for controlling the voltage generated by the voltage generation means to a voltage that selectively cuts off the beam current. Is.

[0008]

According to the above construction, when the beam current is cut off at the time of start-up, the voltage generated by the voltage generator is the potential of the beam control electrode with respect to the anode, and the cathode with respect to the beam control electrode. By controlling so as to correspond to the potential of the beam control electrode, the beam control electrode and the cathode are closed to perform the beam current interruption operation. Thereby, the beam current interruption operation is realized without using a relay. Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a beam hand current cutoff circuit according to an embodiment of the present invention. For example, an anode electrode (beam control electrode) 10 of a traveling wave tube and a heater cathode (H
・ K) Anode power supply 12 between the electrode (cathode) 11
The anode power supply 12 sets the potential of the anode electrode 10 with respect to the potential of the heater cathode electrode 11. The heater cathode electrode 11 is connected to the anode (for example, the body) 13 via the body power supply 14.

Between the anode electrode 10 and the anode 13,
A multiple pressure rectifier circuit, for example, a triple pressure rectifier circuit 15 is provided. The triple voltage rectifier circuit 15 is configured by combining seven diodes D and six capacitors C. This 3
The voltage doubler rectifier circuit 15 is connected to both ends of the secondary winding of the converter transformer 16. This converter transformer 1
6 generates a voltage according to the ratio of the primary side winding and the secondary side winding, the source electrode of the first switching element 17 is connected to one end of the primary side winding, and the primary side winding The source electrode of the second switching element 18 is connected to the other end. The output terminal of the inverter 19 is connected to the gate electrodes of the first and second switching elements 17 and 18. In the inverter 19, the first and second switching elements 17 and 18 are alternately switched on and off as shown in FIG.

The emitter of the transistor 20 is connected to the middle point of the converter transformer 16. The transistor 20 has its collector connected to the drains of the first and second switching elements 17 and 18 via the power supply 21, and its base connected to the output end of the control unit 22. An anode electrode 10 is connected to one input end of the controller 22 and a heater cathode electrode 11 is connected to the other input end thereof. Based on the potentials of the anode electrode 10 and the heater cathode electrode 11, Generate a beam current interruption signal.

In the above structure, the control unit 22 generates a beam current cutoff signal and causes the transistor 20 to detect when a rise, a fall, or an abnormality is detected based on the potentials of the anode electrode 10 and the heater cathode electrode 11. Output. Then, the transistor 20 sets the current from the power source 21 to the potential E3. At this time, the first and second switching elements 17 and 18 are connected to each other via the inverter 19 as shown in FIG.
On / off switching control is alternately performed as shown in FIG. As a result, in the converter transformer 16, the voltage on the primary side is set to the potential ± E4 and the voltage on the secondary side is set to the potential ± E2 in association with the ON / OFF switching operation. Then, the triple voltage rectifier circuit 15 is set to a potential based on ± E2,
The potential E1 of the anode electrode 10 is made to correspond to the potential E7 of the heater cathode electrode 11 with respect to the body electrode. As a result, the anode electrode 10 and the heater cathode electrode 11 are closed and set to 0 V by the body power supply 14, and the beam current is shut off.

Further, when the control section detects the normal control based on the potentials of the anode electrode 10 and the heater cathode electrode 11, it generates a rated voltage control signal to control the voltage from the power source 21 of the transistor 20 in the normal control state. Control so that the converter transformer 16 is set to the middle potential E3.
Switch setting. Then, the converter transformer 16
The potential E4 of the voltage on the primary side is switched and set, and the potential E2 of the voltage on the secondary side is switched and set.
As a result, the potential E1 of the anode electrode 10 with respect to the body electrode 14 is set so as to correspond to the anode power supply 12.
As a result, the anode electrode 10 is controlled to the rated voltage of the potential E6 with respect to the heater cathode electrode 11.

As described above, the beam current interruption circuit is
A triple voltage rectifier circuit 15 for voltage generation is arranged between the anode electrode 10 and the anode 13, and the triple voltage rectifier circuit 15 is selectively controlled to control the voltage between the anode electrode 10 and the anode 13. Variably controlled to close the anode electrode 10 and the heater cathode electrode 11, so that
It was configured to shut off the beam current. According to this
Without using the relay 6 (see FIG. 3) as in the past,
Since the beam current interruption operation is realized, the relay 6
Since the chattering time T2 is eliminated, the operation time can be shortened as much as possible, and since the relay 6 is not deteriorated due to chattering, quick operation control and reliable realization can be realized. Further, since the relay 6 is not used, it is possible to easily promote miniaturization and weight reduction.

In the above embodiment, the case where the beam current of the traveling wave tube is cut off has been described, but the present invention is not limited to this, and the present invention is also applicable to cutting off the beam current of an electron tube having an electrode. ..

Further, in the above embodiment, the transformer for generating the voltage is constructed by using the converter transformer 16, but
The present invention is not limited to this, and can be configured using various transformers such as a piezoelectric transformer and a flyback transformer. The rectifier circuit is not limited to the triple pressure rectifier circuit 15 described above, and a Cockcroft-Walton circuit, a rectifier bridge, or the like may be used. Further, the voltage control method is not limited to the series regulator as in the above embodiment, and it is possible to use a switching regulator. Therefore, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

[0017]

As described above in detail, according to the present invention, there is provided a beam current cutoff circuit which can realize quick and reliable operation control and can promote miniaturization and weight reduction. Can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a beam current interruption circuit according to an embodiment of the present invention.

FIG. 2 is a diagram shown for explaining an operation state of FIG.

FIG. 3 is a diagram showing a conventional beam current interruption circuit.

FIG. 4 is a diagram shown for explaining a conventional problem.

[Explanation of symbols]

10 ... Anode electrode, 11 ... Heater cathode electrode, 12
… Anode power supply, 13… Anode, 14… Body power supply, 15
… Triple pressure rectifier circuit, 16… Converter transformer, 17,
18 ... 1st and 2nd switching elements, 19 ... Inverter, 20 ... Transistor, 21 ... Power supply, 22 ... Control part.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshifumi Akabane No.1 Komukai Toshiba Town, Saiwai-ku, Kawasaki City, Kanagawa Prefecture Komu Plant, Toshiba Corporation (72) Inventor Kei Nakajima, Komukai Toshiba, Kawasaki City, Kanagawa Prefecture Town No. 1 Incorporation company Toshiba Komukai factory

Claims (1)

[Claims] 1. A first power source for controlling a voltage between an anode and a cathode, a second power source for controlling a voltage between the cathode and a beam control electrode, and a portion between the anode and the beam control electrode. A beam current cutoff circuit comprising: a voltage generation means provided; and a voltage control means for controlling the voltage of the voltage generation means to a voltage that selectively cuts off a beam.