JPH0646237Y2 - Charge / discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of Invention] (Field of Industrial Application) The present invention relates to an improvement of a charging / discharging device of a pulse generator used for a laser, an accelerator and the like.

(Prior Art) In a field of application such as a laser and an accelerator, a high-speed, large-current pulse generator is used. These pulse generators use capacitors for charging and discharging.

FIG. 1 is an example of an apparatus using a capacitor to which the present invention is applied. In FIG. 1, the capacitor 1 is charged with a predetermined voltage from another circuit with the polarity shown. This voltage is a circuit that turns on the semiconductor switch 2 at high speed to rapidly discharge the electric charge of the capacitor 1 to generate a high-voltage, large-current pulse between the UV terminals of the pulse transformer 3. In pulse generators used for lasers, accelerators and the like, short pulse waveforms of the order of tens of microseconds to several microseconds are required as the pulse width of the current flowing through the load. Therefore, it is necessary to make the inductance of the loop circuit 4 shown in FIG. 1 extremely small. In order to reduce these inductances, it is necessary to reduce the inductance of the capacitor 1, the wiring, and the leakage inductances of the semiconductor switch 2 and the pulse transformer 3. In particular, low inductance wiring is required for connecting the terminals of the capacitor 1 described above.

An example of a conventional charging / discharging device will be described below with reference to FIGS. 5 and 6.

FIG. 5 shows a plan view and FIG. 6 shows a front view. In this figure, reference numeral 5 is a capacitor, and a large number of capacitors are arranged in a line. Reference numerals 6a and 6b denote conductors that connect a large number of capacitors 5 in parallel, are electrically insulated and integrally formed by inserting an insulator 7, and are arranged at the centers of the capacitor terminals 8a and 8b. Furthermore, the conductors 9a and 9b allow the capacitor terminals 8a and 8b to
It is electrically connected and fixed. Further, 10a and 10b are terminals for connecting the conductors 6a and 6b to the outside, and are formed by being attached to the central portions of the plurality of capacitors.

(Problems to be solved by the invention) In such a conventional charging / discharging device, since the conductors 6a and 6b are wired in parallel, the inductance can be reduced, but when the number of capacitors in parallel is small, the conductor 9a, There is a problem that the inductance due to the length of 9b cannot be ignored. Also, when the number of capacitors in parallel increases, the wiring length from terminals 10a and 10b to each capacitor terminal differs, so current imbalance occurs in the discharge current of each capacitor and the desired pulse cannot be obtained. The problem to say occurs.

An object of the present invention is to provide a charging / discharging device which overcomes the above-mentioned drawbacks of the conventional example, suppresses the inductance of the terminal connection wiring of the capacitor, balances the inductance, and can obtain good pulse characteristics. To do.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, as shown in FIG. 2, two conductors 11a and 11b are formed in a cylindrical shape and coaxially arranged to form a large number of pieces. The capacitor 5 is arranged on the circumference of the conductors 11a and 11b, and the capacitor terminals 8a and 8b are placed inside and outside the conductors 11a and 11b, respectively. Outer terminal 8b on inner conductor 11a
Is connected to the outer conductor 11b, and terminals 14a, 14b for external connection are attached to the conductors 11a, 11b at equal intervals.

(Operation) In the case of the configuration described above, the inductance due to the conductors 9a and 9b shown in the conventional example of FIGS. 5 and 6 can be minimized, and the variation in the wiring length between each capacitor and the external terminal can be eliminated. The sharing of the discharge current of the capacitor is also good.

(Embodiment) FIGS. 2 to 4 show an embodiment of the present invention.

2 and 3 show a plan view and a front view, respectively, of the charging / discharging device of the present invention. FIG. 4 shows the AA cross section in FIG.

In this figure, those parts which are the same as those in FIGS. 5 and 6 are the same parts, so a description thereof will be omitted. In the figure, 11
a and 11b are conductors for connecting a large number of capacitors 5 in parallel, and are formed in a cylindrical shape and arranged coaxially.
An insulator 12 is interposed between a and 11b to be electrically insulated and integrally formed. A large number of the capacitors 5 are arranged on the circumference of the conductors 11a and 11b, and the capacitor terminals 8a and 8b are the conductors 11a and 11b.
Installed inside and outside of a and 11b respectively.
Further, the conductors 13a and 13b electrically fix the inner terminal 8a of the capacitor 5 to the inner conductor 11a, and similarly, the outer terminal 8b of the capacitor 5 to the outer conductor 11b, respectively. Also, 14a and 14b are terminals for connecting with the conductors 13a and 13b to the outside, and a large number of terminals are attached at equal intervals.

In the charging / discharging device configured as described above, the inductance is significantly reduced by forming the conductor coaxially near the capacitor terminal. Also, by providing a large number of terminals 14a, 14b at equal intervals, each capacitor 5
The inductances can be made equal to each other, and the imbalance of charging / discharging current can be prevented.

[Effects of the Invention] As described above, in the charging / discharging device according to the configuration of the invention,
Since the inductance can be suppressed to a small value regardless of the number of parallel capacitors, and there is no imbalance in the inductance due to the wiring length to each capacitor, it is possible to provide a charging / discharging device that can obtain good pulse characteristics.

[Brief description of drawings]

FIG. 1 is a circuit diagram for a high frequency power source used in a charging / discharging device to which the present invention is applied, FIGS. 2 and 3 are plan and front views of the charging / discharging device of the present invention, and FIG. AA cross section in FIG. 1, FIGS. 5 and 6 are a plan view and a front view of a conventional charging / discharging device, respectively. 1 is a capacitor, 2 is a switching element, 3 is a pulse transformer, 4 is a switching circuit, 5 is a capacitor, 6a and 6b are conductors, 7 is an insulator, 8a and 8b are capacitor terminals, 9a and 9b are conductors, and 10a and 10b Is a terminal, 11a and 11b are conductors, 12 is an insulator, 13a,
13b is a conductor, and 14a and 14b are terminals.

Claims (1)

[Scope of utility model registration request] 1. A charging / discharging device in which a plurality of capacitors are connected in parallel, two cylindrical conductors are coaxially arranged, and a cylindrical insulator for electrically insulating between the conductors. , A plurality of capacitors are arranged on the circumference of a coaxial conductor integrally formed, and both terminals of the capacitor are placed inside and outside the coaxial conductor, and further inside the capacitor. Connecting the terminals to the inner conductor of the coaxial conductor and the outer terminals to the outer conductor, and arranging and attaching a number of terminals for external connection to the coaxial conductor formed in the cylindrical shape at equal intervals. A charging / discharging device.