[특허]Method and apparatus for isolating and switching lower voltage pulses from high voltage pulses in electrocrushing and electrohydraulic drills

[미국특허] Method and apparatus for isolating and switching lower voltage pulses from high voltage pulses in electrocrushing and electrohydraulic drills 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-007/15 E21B-004/04 H01F-038/08 H03H-007/38
출원번호	US-0494461 (2014-09-23)
등록번호	US-10113364 (2018-10-30)
발명자 / 주소	Moeny, William M. Gilbrech, Josh Adler, Richard
출원인 / 주소	SDG LLC
대리인 / 주소	Peacock Law P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 89

초록 ▼

Method and apparatus for isolating and switching lower voltage pulses from high voltage pulses in electrocrushing and electrohydraulic drills. A transformer with a high permeability core acts as a magnetic switch or saturating inductor to switch high voltage pulses to initiate an electrocrushing arc and lower voltage pulses to sustain the arc. The transformer isolates the lower voltage components from the high voltage pulses, and switches to deliver the low voltage current when the core saturates. The transformer enables impedance matching to the arc during all stages of drilling. The saturation time of the transformer core is the time delay between initiation of delivering the high voltage pulse and initiation of delivering the lower voltage current.

대표청구항 ▼

1. A method of providing a high voltage pulse to an electrocrushing or electrohydraulic drill bit, the method comprising: providing a transformer comprising a core comprising a saturating high relative permeability magnetic material;the transformer delivering a high voltage pulse to an electrocrushing or electrohydraulic drill bit to initiate arc formation in a substrate being drilled;isolating lower voltage electrical components from the high voltage pulse;saturating the transformer core, thereby lowering its relative permeability; andthe lower voltage components delivering a lower voltage high current pulse through the transformer and to the electrocrushing or electrohydraulic drill bit for powering the arc in the substrate and saturating the transformer core. 2. The method of claim 1 further comprising substantially matching an impedance of the arc both during and after arc formation. 3. The method of claim 1 wherein a pulse width of the high voltage pulse is shorter than a saturation time of the transformer core, thus preventing transformer core saturation by the high-voltage pulse. 4. The method of claim 1 further comprising actively resetting the transformer by bringing the magnetic material out of saturation. 5. The method of claim 1 wherein the magnetic material comprises an amorphous metal alloy, a cobalt-iron alloy, or a ferrite. 6. The method of claim 1 wherein the lower voltage components comprise at least one switch and at least one capacitor. 7. The method of claim 1 wherein the lower voltage electrical components comprise sufficient capacitance to absorb current that leaks through the transformer while the high voltage pulse is being delivered. 8. The method of claim 1 wherein a saturation time of the transformer core is the time delay between initiation of delivering the high voltage pulse and initiation of delivering the lower voltage current. 9. The method of claim 6 wherein said at least one switch comprises a solid state switch, a solid state diode switch, a gas switch, or a magnetic switch. 10. An apparatus for switching power for use in electrocrushing or electrohydraulic drilling, the apparatus comprising: a transformer comprising a core and separate primary and secondary windings, said core comprising a saturating high relative permeability magnetic material;a first circuit electrically connected to said primary winding, said first circuit for delivering an electrical pulse to said primary winding;a second circuit electrically connected to said secondary winding, said second circuit comprising a first capacitor connected in parallel to said secondary winding, wherein a first end of said first capacitor and a first end of said secondary winding is electrically connected to an electrocrushing or electrohydraulic drill bit; anda second capacitor, wherein a first end of said second capacitor is electrically connected to a second end of said first capacitor and a second end of said secondary winding, and a second end of said second capacitor is electrically connected to said electrocrushinq or electrohydraulic drill bit;wherein said second capacitor is charged at a voltage lower than a voltage charging said first capacitor. 11. The apparatus of claim 10 further comprising a reset circuit for resetting said transform by bringing said magnetic material out of saturation. 12. The apparatus of claim 10 wherein said magnetic material comprises an amorphous metal alloy, a cobalt-iron alloy, or a ferrite. 13. The apparatus of claim 10 wherein said first circuit comprises at least one switch and at least one capacitor. 14. The apparatus of claim 10 wherein said second circuit comprises sufficient capacitance to absorb current that leaks through said transformer while a high voltage pulse is being delivered to said electrocrushing or electrohydraulic drill bit. 15. The apparatus of claim 13 wherein said at least one switch comprises a solid state switch, a solid state diode switch, a gas switch, or a magnetic switch.

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[미국특허] Method and apparatus for isolating and switching lower voltage pulses from high voltage pulses in electrocrushing and electrohydraulic drills 원문보기

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[미국특허] Method and apparatus for isolating and switching lower voltage pulses from high voltage pulses in electrocrushing and electrohydraulic drills 원문보기

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