High voltage pre-pulsing

Patent metadata

Field	Value
Publication number	US-2017366173-A1
Application number	US-201715628584-A
Country	US
Kind code	A1
Filing date	Jun 20, 2017
Priority date	Jun 21, 2016
Publication date	Dec 21, 2017
Grant date	—

Abstract

Some embodiments of the invention include a pre-pulse switching system. The pre-pulsing switching system may include: a power source configured to provide a voltage greater than 100 V; a pre-pulse switch coupled with the power source and configured to provide a pre-pulse having a pulse width of T pp ; and a main switch coupled with the power source and configured to provide a main pulse such that an output pulse comprises a single pulse with negligible ringing. The pre-pulse may be provided to a load by closing the pre-pulse switch while the main switch is open. The main pulse may be provided to the load by closing the main switch after a delay T delay after the pre-pulse switch has been opened.

First claim

That which is claimed:

1 . A pre-pulse switching calibration method comprising:
providing a pre-pulse with a pulse width T pp to a load; providing a main pulse to the load after a delay T delay , and the main pulse has an output voltage V out ; adjusting the pulse width of the pre-pulse T pp ; and adjusting the delay T delay until the pre-pulse and the main pulse merge into a single pulse at the load.

2 . The method according to claim 1 , wherein the pulse width T pp is less than 1,000 ns.

3 . The method according to claim 1 , wherein the delay T delay is less than 1,000 ns.

4 . The method according to claim 1 , wherein adjusting the delay T delay until the pre-pulse and the main pulse merge into a single pulse at the load further comprising incrementing the delay T delay by a factor of less than T delay /10.

5 . The method according to claim 1 , wherein adjusting the pulse width of the pre-pulse T pp , further comprises:
determining that the voltage at the load from the pre-pulse is less than the output voltage; and increasing the pulse width of the pre-pulse T pp .

6 . The method according to claim 1 , wherein adjusting the pulse width of the pre-pulse T pp , further comprises:
determining that the voltage at the load has a dip due to T delay being too long; and decreasing the width of T delay .

7 . The method according to claim 1 , wherein the delay T delay is less than the pulse width of T pp .

8 . The method according to claim 1 , wherein the output voltage V out is greater than 100 V.

9 . The method according to claim 1 , wherein the pre-pulse has a rise time less than about 500 ns.

10 . A pre-pulse switching system comprising:
a power source configured to provide a voltage greater than 100 V; a pre-pulse switch coupled with the power source and configured to provide a pre-pulse having a pulse width of T pp ; and a main switch coupled with the power source and configured to provide a main pulse such that an output pulse comprises a single pulse with negligible ringing; wherein the pre-pulse is provided to a load by closing the pre-pulse switch while the main switch is open; wherein the main pulse is provided to the load by closing the main switch after a delay T delay after the pre-pulse switch has been opened.

11 . The pre-pulse switching system according to claim 10 , wherein the pre-pulse has a rise time less than 500 ns.

12 . The pre-pulse switching system according to claim 10 , further comprising a rectified output.

13 . The pre-pulse switching system according to claim 10 , further comprising an H-bridge switching topology.

14 . The pre-pulse switching system according to claim 10 , wherein the stray inductance of the pre-pulse switching system is less than about 1000 nH

15 . The pre-pulse switching system according to claim 10 , wherein the stray capacitance of the pre-pulse switching system is less than about 1000 nF.

16 . The pre-pulse switching system according to claim 10 , wherein either or both the main switch and the pre-pulse switch comprise a solid-state switch.

17 . A switching system comprising:
a high voltage power supply; an output; a plurality of pre-pulse switches coupled with the high voltage power supply, each of the plurality of pre-pulses are configured to provide a pre-pulse to the output; and a plurality of main switches coupled with the power supply, each of the plurality of main switches are configured to provide a main pulse to the output with a voltage greater than 100 V, wherein an output pulse comprises a single output pulse from the combination of the pre-pulse and the main pulse switches with a pulse length greater than 10 ns.

18 . The switching system according to claim 17 , wherein the output pulse has negligible ringing.

19 . The switching system according to claim 17 , wherein each of the main pulses are provided after a delay from the plurality of pre-pulse switches providing the plurality of pre-pulses.

20 . The switching system according to claim 17 , wherein the plurality of pre-pulse switches and the plurality of main switches are arranged in an H-bridge topology.

21 . The switching system according to claim 17 , wherein the pre-pulse has a rise time less than 500 ns.

22 . The switching system according to claim 17 , further comprising a transformer coupled output.

Assignees

• Eagle Harbor Tech Inc

Inventors

• Miller Kenneth E
• Prager James R
• Slobodov Ilia
• Picard Julian F

Classifications

• H03K3/36

  by the use, as active elements, of semiconductors, not otherwise provided for · CPC title

• H03K17/56

  by the use, as active elements, of semiconductor devices (using diodes H03K17/74) · CPC title

• H03K3/57 Primary

  the switching device being a semiconductor device · CPC title

• H02M3/1588

  comprising at least one synchronous rectifier element (H02M3/1582, H02M3/1584 take precedence) · CPC title

• H02M11/00 Primary

  Power conversion systems not covered by the preceding groups · CPC title