Compensation schemes for the voltage droop of solid-state Marx modulators

• US 8,699,249 B1
• Filed: 12/27/2013
• Issued: 04/15/2014
• Est. Priority Date: 07/10/2012
• Status: Active Grant

• Current Assignee: DULY Research Inc.
• Original Assignee: DULY Research Inc.
• Inventors: Chen, Ping
• Primary Examiner(s): Zhang, Jue
• Application Number:
  US14/142,747
• Publication Number:
  US 20140111284A1
• Time in Patent Office: 109 Days
• Field of Search: 363/60, 320/166, 307/108, 307/110
• US Class Current: 363/60
• CPC Class Codes: H03K 17/063 in field-effect transistor switches
• CPC Class Codes: H03K 17/74 by the use, as active elements, of diodes by the use of more than one type of semiconductor device H03K17/567; by the use of tunnel diodes H03K17/58; by the use of negative resistance diodes H03K17/70
• CPC Class Codes: H03K 3/57 the switching device being a semiconductor device
• CPC Class Codes: H03K 7/08 Duration or width modulation ; Duty cycle modulation

Abstract

A novel design scheme for the compensation circuitry of solid-state Marx modulators has been described for enhancing the compensation ability of the compensation cells of solid-state Marx modulators and simplifying the entire circuitry of the modulator. High-speed solid-state switches are adopted in the new compensation cell for the control of the compensation actions. Inductive components and diodes are adopted in the design scheme to smooth the flattop of the voltage pulse output by the Marx modulator.

Claims

1. The high voltage compensation cell that is in series with a Marx cell bank of a solid-state Marx modulator, is operated during pulse flattops and is capable of being charged to the voltage level of the Marx cell in said solid-state Marx modulator so that only one charge voltage source is used for the entire solid-state Marx modulator, storing electric energy for compensating the voltage droop of the pulse flattops of said solid-state Marx modulator;

said high voltage compensation cell comprises;

a first capacitor for charging to the identical voltage value of the Marx cell used in the same solid-state Marx modulator with said high voltage compensation cell so that said high voltage compensation cell can store electric energy for compensating the voltage droop of said solid-state Marx modulator;

said first capacitor is connected to said single charge voltage source through external charge diodes which dictate the charge current direction of said first capacitor;

a first solid-state switch, whose one end is connected to said first capacitor and whose other end is connected to the junction of an inductor and a first diode, controlling the electric energy transfer from said first capacitor to a second capacitor under the triggering of an intelligent control system;

said inductor whose one end is connected to the junction of said first solid-state switch and said first diode, and whose other end is connected to said second capacitor, forming a compensation current circuit to enable compensation current to smoothly flow from said first capacitor, through said first solid-state switch that is controlled by said intelligent control system, to said second capacitor to counteract the voltage droop of said solid-state Marx modulator;

said first diode, whose one end is connected to the junction of said inductor and said first solid-state switch and whose other end is connected to said first capacitor, for stipulating the flow direction of the compensation current to compensate the consumed energy of said second capacitor;

said second capacitor, whose one end is connected to the junction of said inductor and a second solid-state switch and whose other end is connected to the junction of said first capacitor and said first diode, accepting the electric charges flowing from said first capacitor and discharging to the solid-state Marx modulator'"'"'s load through said second solid-state switch when said second solid-state switch is turned on by said intelligent control system;

said second solid-state switch, whose one end is connected to the junction of said inductor and said second capacitor, and whose other end is connected to the junction of a second diode and a third solid-state switch;

said second solid-state switch being “

turned on” and

“

turned off”

under the control of said intelligent control system;

said second diode, whose one end is connected to the junction of said second solid-state switch and said third solid-state switch, and whose other end is connected to the junction of said first capacitor, said first diode and said second capacitor, for defaulting said high voltage compensation cell when it is not used;

said third solid-state switch, whose one end is connected to the junction of said second solid-state switch and said second diode, and whose other end is connected to the junction of said first capacitor, said first diode, said second capacitor and said second diode, for charging said high voltage compensation cells and said Marx cells in series under the control of said intelligent control system;

said intelligent control system for triggering said first solid-state switch in order to regulate the amplitude and duration of the compensation current to make multiple compensation actions, for triggering said second solid-state switch for operating or isolating said high voltage compensation cell from the discharge circuit of said solid-state Marx modulator and for triggering said third solid-state switch for charging the first capacitor of other high voltage compensation cells and the capacitors of said Marx cells in series;

said intelligent control system is connected to all three solid-state switches of said high voltage compensation cell for regulating the compensation function of said high voltage compensation cell.

2. The high voltage compensation cell in claim 1, wherein said first capacitor is connected with said single charge voltage source through said external charge diodes to form a charge loop and can be charged to the identical voltage value of said Marx cell in the same solid-state Marx modulator, stores high electric energy equivalent to the amount of electric energy stored in said Marx cell so that said high voltage compensation cell has the ability to release the stored energy incrementally for the compensation action.

3. The high voltage compensation cell of claim 1 operated with said intelligent control system provides variable voltage output during one voltage pulse of said solid-state Marx modulator to compensate the voltage droop of said solid-state Marx modulator.

4. The method of using a high voltage compensation cell to perform multiple compensations to the Marx cell bank of a solid-state Marx modulator during one output voltage pulse of said solid-state Marx modulator under the control of an intelligent control system;

said high voltage compensation cell is comprised of said intelligent control system and the combined topologies of one buck converter and one said Marx cell, wherein the output port of the topology of said buck convert is connected to a capacitor of the topology of said Marx cell and said buck converter outputs its electrical charges stored in its capacitor to said capacitor in the topology of said Marx cell under the regulation of a solid-state switch of said buck converter;

said solid-sate switch is controlled by said intelligent control system to compensate the charge loss of said capacitor in the topology of said Marx cell on the load of said solid-state Marx modulator, and said high voltage compensation cell has the ability to raise its output voltage incrementally with time during the output voltage pulse of said solid-state Marx modulator for compensating the voltage droop of said solid-state Marx modulator;

said capacitor located in said buck converter as an integral part of said high voltage compensation cell is connected with external charge diodes and one single charge voltage source, and forms a charge circuit loop so that said capacitor in said buck converter can be charged to the identical voltage value of the Marx cell of said solid-state Marx modulator, through said external charge diodes, using said single high voltage charge source;

said single high voltage charge source is employed for said solid-state Marx modulator that comprises of said high voltage compensation cells and said Marx cells in series.