JPH0678545A - Schenkel-type dc high-voltage generator - Google Patents

Abstract

PURPOSE:To change the polarity of DC output voltage easily without removing and attaching rectifiers. CONSTITUTION:Each rectifier 9 is placed between a stage and the next of shielding electrodes 5 and 6, and lead wires 19 connected to the terminals of the rectifier 9 are connected to the shielding electrodes 5 and 6 with connector members 21 being attachable and removable. Concerning to the connection, each lead wire 19 is connected to one of adjoining shielding electrodes as shown by a full line, when output voltage of positive polarity is to be obtained at a high-voltage output terminal. While, for obtaining output voltage of negative polarity, the plug 22 of each connector member 21 is removed from a jack 25, and connected to the other of the adjoining electrodes instead as shown with a dashed line. Incidentally, screwing terminal system connectors can also do as the connector members 21 being removable and attachable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Schenkel type DC high voltage generator capable of switching the polarity of output voltage.

[0002]

2. Description of the Related Art FIG. 5 is a circuit diagram of a balance (full-wave) Schenkel type DC high voltage generator used for an electron beam irradiation device, an accelerating voltage source for charged particles in an electrostatic accelerator, and the like. Of the primary coil 2 ₁ booster coil unit 2 to the high-frequency power source 1 having 10kHz and is connected, a secondary coil 2 ₂ midpoint is grounded is connected to a radio frequency (RF) electrodes 3, 4. These RF electrodes have a shape obtained by dividing a cylinder into two, and a large number of narrow shield electrodes 5 and 6 are provided inside the RF electrode so as to face these electrodes, respectively.
The capacitance between the RF electrode and the shield electrode is used as a smoothing capacitor. The shield electrodes 5 and 6 on the lowest pressure side are grounded, and the shield electrodes 5 and 6 on the highest pressure side are high voltage terminals.
It is connected to the high voltage output terminal 8 of the minal section 7. Shield electrode 5 on each stage and shield electrode 6 on the one stage higher than that
The rectifiers 9 are connected between them in the illustrated polarity, and similarly, the rectifiers 10 are connected between the shield electrodes 6 in each stage and the shield electrode 5 one stage higher than that. The part excluding the high frequency power source 1 is arranged in a pressure tank filled with high-pressure SF ₆ gas. A DC voltage obtained by sequentially rectifying and multiplying the voltage of the secondary coil 2 ₂ is generated at the shield electrodes 5 and 6 of each stage, and a positive DC output voltage is obtained at the high voltage output terminal 8.

The accelerating voltage source requires a DC output voltage having a predetermined polarity depending on the charged polarity of the particles to be accelerated. In the high voltage generator described above, in principle, the polarity of the rectifiers 9 and 10 between the shield electrodes is reversed to obtain a negative DC output voltage at the high voltage output terminal 8. You can By the way, in the case of an accelerating voltage source of charged particles,
Since an extremely high reverse voltage acts on each rectifier 9, 10, each rectifier is configured as a rectifier stack in which a large number of unit rectifiers are connected in series, and a large number of such rectifiers are surrounded by the shield electrodes 5, 6. , Are arranged and fixed to the mounting member in a shielded form. Therefore, in order to change the connection polarity of the rectifiers 9 and 10, it is necessary to remove each rectifier from the mounting member after opening the pressure tank accompanied by the recovery of the insulating gas, and then remount the rectifier in the opposite direction and remount it. It costs.

Therefore, there has been proposed a high voltage generator capable of switching the polarity of the DC output voltage without opening the pressure tank, with the rectifier attached. This has the circuit configuration shown in FIG. 6, and switching contacts 11, 12, 13, and 14 are provided between each stage of the shield electrodes 5 and 6 in addition to a pair of rectifiers 9 and 10.
These switching contacts are interlocked by four insulated drive shafts operated from the outside of the pressure tank to operate all the stages simultaneously, and the terminals of each rectifier 9, 10 are connected to the shield electrodes 5, 6 in the upper and lower stages. By selectively switching and connecting, the connection polarity of each rectifier can be switched (see, for example, Japanese Patent Application No. 1-4016).

[0005]

In such a rectifying and multiplying type high voltage generator, a high DC output voltage can be obtained by increasing the number of rectifying and multiplying stages, and in the case of an MV (megavolt) class accelerating voltage source, a shield is provided. The number of electrode steps reaches several tens. In this case, the total value of the contact pressure in the switching contact mechanism also becomes large, and a large operating force is required for each insulated drive shaft. Since the switching contact between each step must be closely arranged on this drive shaft, sufficient strength, precise processing, and assembly are required to ensure smooth and reliable operation of the switching contact mechanism. Therefore, the mechanism is expensive as a whole.

By the way, in the accelerating voltage source, it is rare that the polarity of the accelerating voltage is switched frequently, and at a production site relating to the irradiation and injection of charged particles, it is performed at a frequency of about once every six months. It's just being seen. In such a case, it is not necessary to install a high-cost switching mechanism that can switch the connection polarity of the rectifier from the outside of the pressure tank.

According to the present invention, the pressure tank is opened, but the Schenkel type DC high voltage generator capable of easily switching the polarity of the DC output voltage by changing the connection of only the lead wire of the rectifier without attaching or detaching the rectifier. The purpose is to provide.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a Schenkel type DC high voltage generator in which a rectifier is provided between each stage of a shield electrode, and a lead wire having one end connected to each terminal of each rectifier. And a detachable connector member that connects the lead wire and the shield electrode, respectively, and the other end of the lead wire connected to each of the rectifiers by the connector member is one of two adjacent shield electrodes. It is characterized in that it is configured so that connection can be changed to one.

[0009]

The switching of the polarity of the DC output voltage is carried out by connecting and disconnecting the lead wire of the rectifier to either of the adjacent shield electrodes without attaching or removing the rectifier. Can be easily implemented because the connection is changed by the detachable connector member.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an assembly configuration diagram of an embodiment, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is an explanatory diagram of connection change of a rectifier. The same reference numerals as those in FIGS. 5 to 6 denote the same parts.
Rectifiers 9 and 10 located between the shield electrodes 5 and 6
Each terminal 15 is attached to a terminal block 16, and the terminal block is fixed to an insulating table 17 with bolts. The two insulating bases 17 are connected by a rod 18. One end of the lead wire 19 of the rectifier is fixed to the terminal block 16 together with the terminal 15 of the rectifier by the terminal 20, and the plug portion 22 of the detachable connector member 21 is attached to the other end of the lead wire. The pin 23 of the plug portion elastically contacts the jack portion 25 of the connector member formed at the end of the conductive member 24 to be electrically connected. The conductive member 24 is fixed to the insulating base 17 by bolts together with the conductive mounting pieces 26 of the shield electrodes 5 and 6, and the end of the conductive mounting piece 26 is mounted via the mounting base 27 fixed to the shield electrodes 5 and 6. It is coupled to the shield electrode.

When a positive DC output voltage is obtained at the high voltage output terminal 8 shown in FIGS. 5 to 6, each lead wire 19 of the rectifier 9 is coded by a removable connector member 21 as shown in FIG. The shield electrode 5 is set so that the solid line connection position for one of the adjacent shield electrodes indicated by + is taken.
And between 6 and 6. When obtaining a negative DC output voltage, the plug portion 22 of the lead wire 19 is removed from the jack portion 25, and the plug portion 22 is connected to the other of the adjacent shield electrodes indicated by the symbol − so that the plug portion 22 is connected to the jack portion 25. Insert and change to. The connection relationship between the rectifier 10 and the shield electrodes 5 and 6 is the same, and the illustration thereof is omitted.

FIG. 4 shows another embodiment of a detachable connector member for connecting the lead wire 19 and the conductive member 24. A terminal 28 is attached to the other end of the lead wire 19, and this terminal is fixed and connected to the conductive member 24 with a screw 29. The polarity of the DC output voltage is changed by removing the screw 29 and connecting the terminal 28 of the lead wire 19 to the conductive member 24 of the other adjacent shield electrode.

[0013]

As described above, the present invention uses the detachable connector member to connect the lead wires. Therefore, the polarity of the DC output voltage can be easily switched, and the rectifier can be attached and detached. Since it is possible to save time and the structure is simple, it is possible to configure a DC high-voltage generator capable of switching polarities at low cost. Also, by using a plug or jack type loose contact connector as the connector member, it is possible to save the labor of reconnecting the lead wires, and even in the case of the screw terminal type, each lead wire of the rectifier Since only one terminal needs to be reconnected, the connection change work can be performed more easily than when attaching and detaching the rectifier.

[Brief description of drawings]

FIG. 1 is an assembly configuration diagram of an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is an explanatory diagram of connection change of a rectifier.

FIG. 4 is a configuration diagram of another embodiment of a detachable connector member.

FIG. 5 is a circuit diagram of a Schenkel type high voltage generator.

FIG. 6 is a circuit diagram of a conventional Schenkel type high voltage generator capable of changing polarity.

[Explanation of symbols]

 5,6 Shield electrode 9,10 Rectifier 15 Rectifier terminal 19 Lead wire 21 Detachable connector member

Claims (1)

[Claims] 1. A Schenkel type DC high voltage generator in which a rectifier is provided between each stage of a shield electrode, a lead wire whose one end is connected to a terminal of each rectifier, and the lead wire and the shield electrode. And a detachable connector member for connecting each of the two, so that the other end of the lead wire connected to each of the rectifiers can be connected and changed to any one of two adjacent shield electrodes by the connector member. A Schenkel type DC high voltage generator characterized in that it is configured.