Electric power conversion systems – Current conversion – With voltage multiplication means
Patent
1999-02-18
2000-05-02
Wong, Peter S.
Electric power conversion systems
Current conversion
With voltage multiplication means
363 60, 307108, 307110, H02M 318, H01J 1700
Patent
active
060580291
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a power unit for creating discharge shock waves which are used for crushing rocks, stones, or concrete.
BACKGROUND ART
Recently, as is seen in British Laid-open Patent No. 2120579, a method has become known in which portions of stones, rocks, or concrete to be crushed are surrounded by a liquid environment, and a high-voltage discharge is generated to create shock waves, thereby crushing the stones, rocks, or concrete.
FIG. 10 shows a so-called Marx generator, which is a power unit for creating discharge shock waves by generating a high-voltage discharge in the aforesaid method. The Marx generator generates a pulse at a discharge electrode 2 with the pulse having a high voltage (50 kV to 800 kV) and a pulse width of about 200 nsec, from an inexpensive power source 1 of smaller voltage (40 kV). For example, as shown in the drawing, six capacitors C1 to C6 are sequentially connected in parallel to the power source 1 via resistors 3a to 3k. In addition, the upstream and downstream sides of each pair of adjacent opposed capacitors C1 and C2, C2 and C3, C3 and C4, C4 and C5, and C5 and C6, are respectively connected by switches S11 to S15, and the last capacitor C6 is connected to the discharge electrode 2.
Specifically, in the Marx generator in FIG. 10, the capacitors C1 to C6 are respectively charged with the current from the power source 1 (40 kV) by opening the switches S11 to S15. Thereafter, the capacitors C1 to C6 are switched from the parallel connection to a serial connection by simultaneously closing the switches S11 to S15, thereby establishing a high-voltage power source of 240 kV as a whole, and a discharge pulse is generated at the discharge electrode 2 with a pulse width of about 200 nsec, for example.
However, in the aforesaid Marx generator, the discharging current flows through the switches S11 to S15, thereby wearing the switches S11 to S15; therefore, disadvantages occur in the performance, reliability, durability, and cost. In addition, there is a disadvantage in that the inductance components of the switches S11 to S15 prevent the generation of "a shorter pulse" which is advantageous in generating shock waves.
SUMMARY OF THE INVENTION
The present invention is made to eliminate the aforesaid disadvantages of the prior art, and its object is to provide a power unit for creating discharge shock waves which is more advantageous in performance, reliability, durability, and cost.
Each of a first configuration and a second configuration of a power unit for creating discharge shock waves according to the present invention includes: capacitors so that the every other capacitors out of the plurality of capacitors can be switched into a LC series circuit; first power source terminal of a power source and the connections between the respective first coils and the respective switches; power source terminal side of a respective second capacitor, which is other than said every other capacitors out of the plurality of capacitors, and the second power source terminal side of a respective switch, and which are connected in series with the second power source terminal of the power source; and capacitor out of the plurality of capacitors.
According to the aforesaid circuit, the following effects are obtained. All of the capacitors are charged from the power source with all the switches being open. However, the polarities of the capacitors on some sides become different from the polarities of the capitors on other sides. If all the switches are closed at the same time after the charging for all of the capacitors is completed, the capacitors on some sides discharge and the polarities are reversed. Accordingly, the polarities of all of the capacitors become the same, and the high voltage of the capacitors connected in series to the discharge switch is applied, thereby enabling a high-voltage discharge. When all of the switches are closed, the respective discharging currents of the capacitors on some sides flow through all of the switches, but the currents a
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Hiraki Hikosaburo
Itow Koichiro
Shimada Ryuichi
Komatsu Ltd.
Patel Rajnikant B.
Wong Peter S.
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