Switching system using laser induced discharge

Details Switching system using laser induced discharge Switching system using laser induced discharge

2000-12-29

2003-06-10

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

C315S150000, C315S152000, C315S155000, C372S038030

Reexamination Certificate

active

06577067

ABSTRACT:

BACKGROUND OF THE INVENTION
a) Field of the Invention
The present invention relates to a switching system using laser induced discharge.
b) Description of the Related Art
It is difficult to switch high voltage and large current by mechanical switching using such as an ordinary relay. A practically usable device capable of switching even high voltage and large current is a thyratron. Switching by a thyratron utilizes discharge.
However, a thyratron has a complicated structure and is expensive. Another switching system capable of switching high voltage and large current is a laser trigger gap (LTG) system. With this LTG, as shown in
FIG. 3
, a spherical electrode
10
is disposed facing another electrode
11
having a laser aperture
12
. A laser is radiated from the electrode
10
toward the electrode
11
to generate a plasma plume
14
by which switching is conducted. The feature of LTG resides in that timing and synchronization can be obtained correctly and reliably. With LTG, the number of circuits to be switched is not theoretically limited and multiple switching is possible. However, electrodes and equipments are required to be positioned optically precisely, so that the number of switches is theoretically limited. Under such circumstances, developments on switching through laser induced discharge have been long desired, this switching being capable of realizing multiple switching for a number of circuits, being good in synchronization, and having no switching time delay among circuits.
SUMMARY OF THE INVENTION
The invention has been made under such circumstances. It is an object of the present invention to provide a switching system using laser induced discharge, capable of reliable switching with a simple structure, multiple switching for a number of circuits, good synchronization and no switching time delay among circuits.
In order to achieve the above object of the invention, there is provided a switching system using laser induced discharge for controlling conduction between electrodes of a switch by discharge between the electrodes, wherein a laser beam is applied to one of the electrodes to make discharge from the other of the electrodes be induced by the laser beam and application of the laser beam is controlled to switch the conduction.


REFERENCES:
patent: 5097472 (1992-03-01), Chenausky
patent: 5317574 (1994-05-01), Wang
patent: 5676861 (1997-10-01), Hoshi
patent: 20000133408 (1998-10-01), None
Guenther, et al “The Laser Triggering of High-Voltage Switches”, J. Phys. D: Appl. Phys., vol. 11, 1978.
Earley, et al “Firing Characteristics of a Low-Jitter Miniature . . . ”, IEEE Transactions of Plasma Science, vol. 18, No. 2, Apr. 1990.

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