Method of and apparatus for high voltage pulse generation

• US 4,274,134 A
• Filed: 04/09/1979
• Issued: 06/16/1981
• Est. Priority Date: 04/09/1979
• Status: Expired due to Term

• Current Assignee: Megapulse, Inc.
• Original Assignee: Megapulse, Inc.
• Inventors: Johannessen, Paul R.
• Primary Examiner(s): SHOOP JR, WILLIAM M
• Application Number:
  US06/028,117
• Time in Patent Office: 799 Days
• Field of Search: 307/106, 307/108, 328/60, 328/61, 328/156, 328/157, 328/65, 328/117, 363/59, 363/60
• US Class Current: 363/59
• CPC Class Codes: H02M 3/07 using capacitors charged and discharged alternately by semiconductor devices with control electrode , e.g. charge pumps
• CPC Class Codes: H03K 3/57 the switching device being a semiconductor device

Abstract

This disclosure is concerned with generating in a plurality of successive modules, simultaneously and repetitively, a plurality of similar, simultaneous, narrow high voltage pulses, and adding them together in a way that the failure of mis-timing of any module will not prevent the continued operation of the resultant pulse generation. The result is attained by appropriate interconnection of the modules, each of which embodies triggered charging and preferably magnetic pulse-compression and step-up operations.

Claims

1. High voltage generator apparatus having, in combination, repetitively triggered charging circuit means;

a plurality of successively connected similar pulse-generating modules connected with the charging circuit means and each comprising charge storage circuit means and pulse forming and transformer circuit means;

trigger circuit means operable upon each charging of said charge storage circuit means of each module for thereupon triggering the transfer of the energy of such charging to the corresponding module pulse forming and transformer circuit means in order to form therein a stepped-up high-voltage output pulse, with the said high-voltage output pulse of each module thereby occurring at substantially the same instant of time, producing a resultant high-voltage output pulse corresponding to the totality of the output pulses of the pulse forming and transformer circuit means of the plurality of modules; and

means cooperative with the connections between the successive modules for preventing the peak voltage within each module from exceeding the peak output voltage of the module independent of the position of the module in the plurality of modules, such that module failure results only in a reduction in the resultant output pulse power and enables continual operation even in the presence of such failure.

2. Apparatus as claimed in claim 1 and in which said charge storage circuit means of each module comprises capacitor means connected to be charged through inductor means presenting predetermined inductance effects during said charging, the said capacitor means providing the energy for generating the high-voltage pulse in the corresponding pulse forming and transformer circuit means, and control and reset energy therefor.

3. Apparatus as claimed in claim 2 and in which each said pulse forming and transformer circuit means comprises a triggered magnetic pulse compression and step-up means for generating relatively narrow high peak power pulses from the energy transferred thereto from the capacitor means of the corresponding module charge storage circuit means.

4. Apparatus as claimed in claim 3 and in which said magnetic pulse compression means comprises a plurality of stages of saturable reactor means controlled by said trigger circuit means to transfer energy from stage to stage in successively shorter time intervals and with successive step-up of the pulse voltage generated in each stage.

5. Apparatus as claimed in claim 2 and in which means is provided for controlling the said transfer of energy such that the charging of the capacitor means of the charge storage circuit means of the successive modules in the plurality of modules is successively slightly delayed and slightly less in voltage than in the preceding module, with the voltage subsequently substantially equalizing thereafter.

6. Apparatus as claimed in claim 2 and in which said modules are successively series-connected in the said plurality of modules.

7. Apparatus as claimed in claim 6 and in which the charging circuit means comprises triggered power supply capacitor means and charging inductance, with the said predetermined inductance presented during said charging by the said inductor means of the charge storage circuit means of the modules being adjusted to be of value smaller than that of said charging inductance, and the sum of the capacitance of said capacitor means of each module charge storage circuit means being adjusted to be substantially smaller than the said power supply capacitor means.

8. Apparatus as claimed in claim 2 and in which modules of said plurality of modules are connected in parallel.

9. Apparatus as claimed in claim 8 and in which said pulse forming and transformer circuit means of parallel-connected modules comprise triggered magnetic pulse-compression stages embodying saturable reactors, with the parallel connection occuring between saturable reactor stages of successive moules.

10. Apparatus as claimed in claim 1 and in which the charge storage circuit means of the successive modules each comprise capacitor means and inductor means across the latter of which the high-voltage output of a preceding module is impressed, with the terminals that interconnect successive modules being at the same potential as the high voltage output terminal of the preceding modules.

11. Apparatus as claimed in claim 10 and in which each of said inductor means comprise a bifilar wound inductance adjusted such that during the charging interval only the leakage inductance thereof affects the charging current.

12. Apparatus as claimed in claim 10 and in which the said inductor means of the charge storage circuit means of a module is connected to the said capacitor means of the charge storage circuit means of the next successive modules.

13. Apparatus as claimed in claim 4 and in which means is provided to cause saturable reactor means of a module, the output of which may not coincide in time with the output pulses of the other modules of the plurality of modules, to act in the nature of a forwardconducting means for the current generated by the other modules.

18. A method as claimed in claim 13 and in which the successive charge storage modules are inductively connected and the interconnecting of successive modules is effected at the same potential as the high voltage output terminal of the preceding module.

14. A method of repetitive high-voltage pulse generation, that comprises, substantially simultaneously repetitively charging a plurality of similar charge storage modules;

substantially simultaneously transferring and forming the energy of the charge in each module into similar narrow high-voltage output pulses in each module;

interconnecting the modules to add the high-voltage output pulses of all the modules to produce resultant high-voltage output pulses corresponding to the totality of the output pulses of the modules; and

preventing the peak voltage developed within each module from exceeding the peak output voltage of the module independent of the position of the module in the plurality of modules, such that module failure results only in reduction in the resultant output pulse power and enables continual operation even in the presence of such failure.

15. A method as claimed in claim 14 and in which said transferring and forming steps are effected by successive pulse compressing of the said energy of the charge in each module and successive stepping-uo of the resulting pulse voltage to form the similar narrow high-voltage output pulse each time the charge storage modules are charged.

16. A method as claimed in claim 15 and in which said pulse comprising and stepping-up are effected through triggered magnetic saturable reactor energization.

17. A method as claimed in claim 15 and in which said transferring and forming steps are effected in response to triggering the discharge of the said energy of the charge in each module, and timing adjustment of such triggering is effected at full power operation.