JPH0224185Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-voltage pulse generation switch used in a pulse generator that generates high-voltage pulses.

Generally, a pulse generator using this type of switch is used, for example, in a tester that tests malfunctions of electronic equipment by applying generated high-voltage pulses as pseudo noise to a power supply. In this type of pulse generator for pseudo noise generator, as shown in FIG. The switch 1 is connected to one output terminal 3a, and the other fixed contact terminal (normally open terminal) 1b of the switch 1 is connected to one end of the load 4. Further, the movable contact terminal 1c of the switch 1 is connected to the center conductor 5a of the delay coaxial cable 5. Further, the other output terminal 3b of the high voltage power supply 3 and the other end of the load 4 are connected to the outer shield wire 5b of the coaxial cable 5.

In such a configuration, switch 1 is normally
Since the movable contact terminal 1c is connected to the normally closed terminal 1a, the coaxial cable 5 is charged with power supply voltage from the high voltage power supply 3 through the charging resistor 2. Thereafter, when the switch 1 is driven and its movable contact terminal 1c is connected to the normally open terminal 1b, a steep pulse is applied to the load 4 due to the discharge of the coaxial cable 5. The pulse width of this pulse is
Depends on the length. Further, the characteristic impedance of the coaxial cable 5 and the impedance of the load 4 are generally set to have the same value.

By the way, just normally closed terminal 1 as shown in Figure 2
In a pulse generator using a switch 1 in which a is connected to a charging resistor 2 through a conductor, the pulse waveform was measured by the present inventors, and found that at the rising edge of the pulse wave, there was a steep rise followed by unnecessary vibrations. was observed to appear. The reason why this unnecessary vibration appears is that when the switch 1 is driven so that its movable contact terminal 1c is closed to the normally open terminal 1b, a small capacitance between the normally closed terminal 1a and the movable contact terminal 1c is generated. , a part of the high-pressure pulse energy that should originally be released only to the load 4 side is
This is thought to be due to leakage to the normally closed terminal 1a side.

Therefore, in a noise generator for malfunction testing of electronic equipment that uses a pulse generator such as the one described above, unnecessary vibrations appear at the rising edge of the pulse, causing variations in malfunction voltage and loss of reproducibility of test results. I'll get lost.

[Conventional technology]

In view of the above points, the inventors of the present invention have already developed
- In Publication No. 93251, a high-voltage pulse generator having a reed switch consisting of a movable contact terminal and two fixed contact terminals, one of which is connected to a high-voltage power supply via a charging resistor and the other connected to the load side, is disclosed. This is a reed switch, and a ferrite tube is inserted into the conductor near the fixed contact terminal connected to the fixed contact terminal on the power supply side, and the ferrite tube and the reed switch are integrated with a metal case. We have provided a switch for high-voltage pulse generators that suppresses unnecessary vibrations that appear in the parts and improves the quality of pulse waves.

[Problem that the invention attempts to solve]

However, even in the pulse generator using the switch proposed above, the coaxial cable 5 cannot be charged with a voltage higher than the withstand voltage between the contacts of the switch 1.
As modern electronic devices have become more sophisticated, the low-voltage pulses output from conventional pulse generators are no longer causing malfunctions in many cases.

[Means for solving problems]

The high-voltage pulse generator switch according to the present invention is
a first reed switch having a first movable contact terminal connected to a charge accumulation means, a first fixed contact terminal connected to a high voltage power supply via a charging resistor, and a second fixed contact terminal; , a second reed switch having a third fixed contact terminal connected to the second fixed contact terminal and a second movable piece contact terminal connected to the load side, the first fixed contact terminal A ferrite tube is inserted into the conductor near the first fixed contact terminal connecting the charging resistor and the charging resistor, and the ferrite tube, the first reed switch, and the second reed switch are covered with a metal case. Features.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, numeral 1 is a reed switch consisting of a mercury switch having two fixed contacts, as in FIG. A coaxial connector 6 for connecting a capacitor (not shown) is connected, and one end of a conductor 7 is connected to its normally closed terminal 1a, and one end of a conductor 8 is connected to its normally open terminal 1b. 1' is a make type reed switch consisting of a mercury switch having one fixed contact, and a coaxial connector 9 for connecting a load 4 (Fig. 2) is connected to its movable contact terminal 1'c, and its constant One end of the conductor 10 is connected to the open terminal 1'b. Conductor 7 is ferrite tube 1
1, and a charging resistor 2 (FIG. 2) is connected to the other end via a high voltage wire 12.

The outer peripheries of the reed switch 1, conductors 7, 8, and ferrite tube 11 are wrapped in an insulator 13, and the outer periphery of the insulator 13 is further covered with a metal case 14 to integrate the ferrite tube 11 and the reed switch 1. Similarly, the outer periphery of the reed switch 1' and the conductor 10 is covered with an insulator 13', and the outer periphery of the insulator 13' is covered with a metal case 14'.
These metal cases 14, 14' are connected to conductors 8, 10
At a position where the other ends contact each other, they are connected by a connector 15 and combined. Further, a driving coil 16 for driving the reed switches 1, 1' is attached to the outer periphery of the metal cases 14, 14' corresponding to the reed switches 1, 1'.

Next, the operation will be explained.

FIG. 1 shows the positions of the contacts in steady state. In this state, the power supply voltage from the high voltage power supply 3 passes through the charging resistor 2, the high voltage wire 12, the conductor 7, the normally closed terminal 1a, the movable contact terminal 1c, and the coaxial cable connected to the coaxial connector 6. 5
is charged to. Thereafter, a current is applied to the drive coil 16 to switch the switches 1 and 1' so that their movable contact terminals 1c and 1'c are normally open terminals 1b and 1'b.
When the coaxial cable 5 is driven to close, the voltage charged in the coaxial cable 5 is transferred to the coaxial connector 6, the movable contact terminal 1c, the normally open terminal 1b, the conductors 8, 10,
It is discharged to the load 4 connected to the coaxial connector 9 via the normally open terminal 1'b and the movable single contact terminal 1'c,
A steep pulse wave is applied to the load 4.

At this time, since the ferrite tube 11 is inserted, similar to the one previously filed by the present inventors, it prevents high frequency energy from leaking to the charging resistor 2 side, and the reed switches 1, 1' and Since the ferrite tube 11 is covered with a metal case,
Leakage of high frequency energy due to radiation is prevented. Furthermore, in the present invention, since switch 1' is added, a high voltage (Vb) corresponding to the sum of the withstand voltage Vb between the contacts of switch 1 and the withstand voltage Vb'
The coaxial cable 5 can be charged up to +Vb′). Therefore, higher voltage pulses can be generated than before.

Furthermore, in this embodiment, the switches 1 and 1' are covered with separate metal cases 14 and 14', respectively, and the metal cases 14 and 14' are connected by the connector 15, so that the voltage to be used and the output pulse can be changed. Various combinations are possible depending on the conditions.

[Effect of idea]

As is clear from the above description, according to the present invention, by adding one switch, high amplitude pulses can be applied to the load, making it possible to test higher performance electronic devices.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the structure of an embodiment of a high-voltage pulse generator switch according to the present invention, and Fig. 2 is a circuit diagram showing the structure of a high-voltage pulse generator equipped with a conventionally commonly used switch. be. 1, 1'... Reed switch, 11... Ferrite tube, 14, 14'... Metal case.

Claims (1)

[Claims for Utility Model Registration] 1. In a switch used in a pulse generator that generates high-voltage pulses, a first movable contact terminal connected to a charge accumulation means, connected to a high-voltage power source via a charging resistor. a first reed switch having a first fixed contact terminal and a second fixed contact terminal; a third fixed contact terminal connected to the second fixed contact terminal; and a third fixed contact terminal connected to the load side. a second reed switch having two movable piece contact terminals, and inserting a ferrite tube into a conductor near the first fixed contact terminal that connects the first fixed contact terminal and the charging resistor; A switch for a high voltage pulse generator, characterized in that the ferrite tube, the first reed switch, and the second reed switch are covered with a metal case. 2. The metal case consists of a first metal case that covers the ferrite tube and the first reed switch, and a second metal case that covers the second reed switch, and these first and second metal cases A switch for a high-voltage pulse generator according to claim 1, wherein a metal case is connected by a connector at a connection point between the second fixed contact terminal and the third fixed contact terminal.