JPH0625057Y2 - Pulse generator - Google Patents

Description

The present invention relates to a pulse generator, and more particularly to a pulse generator for applying high voltage pulses to electronic components such as capacitors for testing it.

[Background technology]

An example of this kind of pulse generator as shown in FIG. 2 has already been proposed by the present applicant in Japanese Patent Application No. 62-194342. In FIG. 2, a pulse generator 1 includes an outer case 2, a first charging capacitor C ₁ which is built in the outer case 2 and is coaxially arranged in order, an output pulse wave front adjusting capacitor C ₀ and a second charge. Capacitor C ₂ and the insulating oil 3 with which the outer case 2 is filled. When an object to be measured is connected between the electrode plates 4 and 5 and a trigger pulse (not shown) is applied to the discharge gap g, the charges charged in the first and second charging capacitors C ₁ and C ₂ become It discharges and is applied as a pulse to the DUT.

[Problems to be solved by the device]

In the pulse generator 1 described above, when the operating temperature rises, the insulating oil 3 expands accordingly. However, since the outer case 2 is hermetically closed, the insulating oil 3 cannot escape, and in an extreme case, the outer case 2 is damaged. Even when used at a low temperature, the insulating oil 3 contracts, and a similar situation occurs. Therefore, in the pulse generator 1 in which the outer case 2 is hermetically filled with the insulating oil 3 as described above, the usable temperature range is limited to a narrow range of 0 to 50 degrees, for example.

Therefore, a main object of the present invention is to provide a pulse generator capable of widening a usable temperature range.

[Means for Solving the Problems]

The present invention is directed to an outer case, a charging capacitor housed in the outer case, insulating oil filled in the outer case, and a terminal formed outside the outer case for outputting a pulse due to the charging charge of the charging capacitor. , And a pulse generator that is housed in the outer case and is connected to a terminal and that includes a wave crest adjustment capacitor for adjusting the crest value of a pulse, the variable generator provided in a part of the outer case, The pulse generator is characterized in that the deformable portion deforms when it expands or contracts so as to absorb the expansion or contraction.

[Action]

When the operating temperature rises, the insulating oil expands, the deformable portion deforms due to the expansion, and the expanded portion of the insulating oil is absorbed by the deformation. At low temperatures, the insulating oil contracts, the deformable portion deforms with the contraction, and the contraction of the insulating oil is absorbed by the deformation.

[Effect of device]

According to this invention, the expansion or contraction of the insulating oil is absorbed by the deformation of the deformable portion, so that the pulse generator can be used stably and safely even at a high temperature. Compared with, the usable temperature range can be expanded.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the embodiments below with reference to the drawings.

[Embodiment] Referring to FIG. 1, a pulse generator 1 of this embodiment.
0 includes a cylindrical outer case 12 made of metal, for example. A hollow bobbin 14 is arranged in the outer case 12 in the vicinity of a substantially central portion thereof, and on the outer periphery thereof, a first charging capacitor C ₁ composed of, for example, a film capacitor, and an output pulse wave front adjusting capacitor C ₀ are sequentially arranged. And the second charging capacitor C ₂ are arranged coaxially. Both surfaces of the first charging capacitor C ₁ and the wave front adjusting capacitor C ₀ and between the wave front adjusting capacitor C ₀ and the second charging capacitor C ₂ are sandwiched between insulating sheets 16. Conductor sheets 18a and 1
8b is inserted.

Then, on the upper surface 20 of the outer case 12, along the ring-shaped upper end surface of the first charging capacitor C ₁ , first terminals 22 are equiangularly spaced at a substantially constant distance from the center.
Further, along the ring-shaped upper end surface of the second charging capacitor C ₂ , the second terminals 24 are arranged at equal angular intervals at a substantially constant distance from the center, and further, the wave crest adjusting capacitor C _0.
A plurality of third terminals 26 are formed at equal angular intervals along the ring-shaped upper end surface at substantially constant distances from the center. First terminal and second terminal 22 and 2
4 is connected to one electrodes of the first charging capacitor C ₁ and the second charging capacitor C ₂ by lead wires 28 and 30, respectively, and the third terminal 26 is connected by the lead wire 32 to the wave front adjusting capacitor C 1. ₀ is connected to one electrode and one end of the conductor sheets 18a and 18b. Then, on the first terminal 22 and the second terminal 24, a first insulating plate 36 having a metal layer 34 formed on the lower surface thereof is formed.
Are placed. A switch 38 is disposed on the first insulating plate 36, and one discharge electrode 40 of the switch 38 is
It penetrates through the insulating plate 36 and is connected to the metal layer 34. The other discharge electrode 42 of the switch 38 is attached to the metal bellows 44 formed on the first insulating plate 36 so as to face the one discharge electrode 40 so as to form a discharge gap g. Discharge electrode 42, that is, metal bellows 44
Is connected to the third terminal 26 penetrating the metal plate 34 and the first insulating plate 36 via the braking resistor Rs.

On the other hand, to the lower surface 46 of the outer case 12, the other electrodes of the first and second charging capacitors C ₁ and C ₂ and the wave crest adjusting capacitor C ₀ are connected by the lead wire 48. Further, a fourth terminal 50 is formed on the lower surface 46 of the upper surface 20 at a position corresponding to the third terminal 26. The third terminal 26 and the fourth terminal 50 are electrically connected to each other by the conductor sheets 18a and 18b. Further, below the lower surface 46, the second insulating plate 52 is fixed by a rivet 54 or the like at a constant distance from the lower surface 46. At this time, a ring-shaped electrode layer 56 is formed on the outer peripheral portion of the lower surface of the second insulating plate 52, and is electrically connected to the lower surface 46 of the outer case 12 through the rivets 54. A circular electrode layer 58 is formed in the center of the lower surface of the second insulating plate 52, and the above-mentioned fourth terminals 50 are connected to the electrode layer 58 at equal angular intervals. Acts as an output terminal board. A discharge resistor Ro is inserted between the rivet 54 and the electrode layer 58.

In this pulse generator 10, an electronic component such as a capacitor, that is, an object to be measured is attached between the electrode layer 56 and the electrode layer 58. And the outer case 1
2 is connected to the ground, and a DC voltage is applied to the metal layer 34 connected to the discharge electrode 40 of the switch 38 through a charging resistor (not shown), the first charging capacitor C ₁
The second charging capacitor C ₂ is charged through the first terminal 22 and the lead wire 28 and the second terminal 24 and the lead wire 30, respectively.

After the charging of the first and second charging capacitors C ₁ and C ₂ is completed, when the metal bellows 44 is pressed to turn on the switch 38, a discharge is generated between the discharge electrodes 40 and 42 in the discharge gap g. Therefore, the charge charged in the first and second charging capacitors C ₁ and C ₂ is discharged through the discharge electrodes 40 and 42. That is, a discharge current is supplied from the first charging capacitor C ₁ and the second charging capacitor C ₂ to the metal layer 34 via the lead wire 28 and the first terminal 22, and the lead wire 30 and the second terminal 24, respectively. Pour in. The discharge current reaches from the discharge electrode 40 through the discharge gap g to the discharge electrode 42, and then reaches the metal bellows 44 and the first resistor R.
s to the third terminal 26, further to the conductor sheets 18a and 18b through the lead wire 32, and
Discharge from the terminal 50.

At this time, since the wavefront adjusting capacitor C ₀ is connected in parallel with the conductor sheets 18a and 18b and the second resistor Ro is interposed between the fourth terminal 50 and the ground, the electrode layers 56 and 58 are not connected. The peak value and frequency of the pulse generated from between are between this wave crest adjustment capacitor C ₀ and the second resistor R
It depends on the value of o (first resistance Rs) and the charge / discharge time constant.

It should be noted that the upper surface 20 and the lower surface 4 of the outer case 12
Compressible and expandable bellows 6 at approximately the center of each 6.
0 is attached. The bellows 60 is made of, for example, a relatively strong metal such as phosphor bronze or stainless steel, and has respective cavities, and the upper surface 20 and the lower surface 46 of the outer case 12 are arranged so that the cavities communicate with the outside air.
It is fixed to an opening (not shown) formed in the. The bellows 60 needs to be fixed to the upper surface 20 and the lower surface 46 in a sufficiently liquid-tight manner so as to seal the insulating oil 62 filled in the outer case 12.

When using this pulse generator 10 under high temperature,
The insulating oil 62 filled in the outer case 12 expands. As the insulating oil 62 expands, the bellows 60 attached to the upper surface 20 and the lower surface 46 of the outer case 12 are compressed in the directions of solid arrows 64a.
Therefore, the expanded portion of the insulating oil 62 is absorbed by the bellows 60. That is, the expansion of the insulating oil 62 compresses and deforms the bellows 60, and the air in the cavity (not shown) is pushed out to absorb the expanded amount of the insulating oil 62. Therefore, the outer case 12 will not be damaged by the expansion of the insulating oil 62 even at high temperatures.

On the contrary, when the temperature is low, the insulating oil 62 contracts, and the bellows 60 expands in the direction of the dotted arrow 64b with the contraction. Therefore, the contraction of the insulating oil 62 is also absorbed by the bellows 60.

As described above, according to the pulse generator 10 of this embodiment, the operation of the bellows 60 can be expected to provide a stable operation over a wider temperature range than the conventional one.

Although not shown, the entire pulse generator 10 directly connected to the object to be measured may be placed in a constant temperature / humidity bath, a high temperature bath or a low temperature bath. The number of pulse generators 10 at that time may be arbitrary.

Further, in the above-described embodiment, the bellows 60 is used to absorb the expansion / contraction of the insulating oil 62, but the bellows 60 is attached to the side surface and the like of the outer case 12 in addition to the upper surface 20 and the lower surface 46. Or, if possible, it may be mounted projectingly. Further, the deformable member is not limited to the bellows 60 described above, and may be formed of rubber or the like that is relatively hard and can withstand high temperature or low temperature.

[Brief description of drawings]

FIG. 1 is an illustrative view showing one embodiment of this invention. FIG. 2 is an illustrative view showing one example of a pulse generator which is the background of this invention. In the figure, 10 is a pulse generator, 12 is an outer case, C ₁ is a first charging capacitor, C ₀ is a wave front adjusting capacitor, C ₂ is a second charging capacitor, 20 is an upper surface of the outer case, and 46 is The lower surface of the outer case, 60 is a bellows, and 62 is an insulating oil.

Claims (3)

[Scope of utility model registration request] 1. An outer case, a charging capacitor housed in the outer case, insulating oil filled in the outer case, and a pulse generated by the charge of the charging capacitor formed outside the outer case. A pulse generator including a terminal for outputting, and a wavefront adjustment capacitor housed in the outer case and connected to the terminal for adjusting the wavefront value of the pulse, the pulse generator being provided in a part of the outer case. Equipped with a deformable part,
A pulse generator, wherein when the insulating oil expands or contracts, the deformable portion deforms to absorb the expansion or contraction. 2. The pulse generator according to claim 1, wherein the deformable portion includes an expandable bellows. 3. The pulse generator according to claim 2, wherein the bellows has a cavity and is attached to the outer case so that the cavity communicates with the outside air.