Pulse generator with charge pump

• US 5,587,680 A
• Filed: 06/30/1995
• Issued: 12/24/1996
• Est. Priority Date: 06/30/1995
• Status: Expired due to Term

• Current Assignee: MTS Systems Corporation (Illinois Tool Works Inc.)
• Original Assignee: MTS Systems Corporation (Illinois Tool Works Inc.)
• Inventors: Smith, Stephen W.
• Primary Examiner(s): Callahan, Timothy P.
• Assistant Examiner(s): ZWEIZIG, JEFFERY SHAWN
• Application Number:
  US08/497,210
• Time in Patent Office: 543 Days
• Field of Search: 327/110, 327/148, 327/157, 327/291, 327/300, 327/304, 327/390, 327/534, 327/535, 327/536, 327/589, 331/17, 331/57, 331/185
• US Class Current: 327/291
• 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 17/063 in field-effect transistor switches

Abstract

A current pulse generator for generating current pulses on a conductor of controllable magnitude and duration based on a controlled pulse former. This pulse former is controlled by a controller in communication with a current sensor and operating a magnitude control signal generator as well as the pulse former, the magnitude signal generator also providing a selection signal to the pulse former.

Claims

1. A current pulse generation system for generating current pulses on an electrical pulse conductor, said current pulse generation system comprising:

a variable magnitude pulse former having a magnitude control input, a pulse initiation input, and an output electrically connected to said pulse conductor, said variable magnitude current pulse former being capable of forming a current pulse at said output thereof upon an initiation signal being provided to said initiation input thereof with said current pulse having a magnitude substantially determined by a magnitude control signal provided at said magnitude control input thereof;

a magnitude control signal generator having an input, and having an output electrically connected to said variable magnitude pulse former magnitude control input, said magnitude control signal generator providing a signal at said output thereof having a magnitude determined by a signal applied to said input thereof;

a current pulse magnitude sensor having an input electrically connected to said pulse conductor and having an output, said current pulse magnitude sensor providing an output signal on said output thereof indicative of magnitudes reached by current pulses occurring on said pulse conductor; and

a pulse controller having an input electrically coupled to said current pulse magnitude sensor output, a selection output electrically connected to said magnitude control signal generator input, and an initiation output electrically connected to said variable magnitude pulse former initiation input, said pulse controller being capable of providing initiation signals on selected occasions of selected magnitudes on said initiation output thereof.

2. The system of claim 1 wherein said variable magnitude pulse former further has a recovery input and said pulse conductor is capable of storing energy thereabout if an electrical current pulse is transmitted therealong, said system further comprising an energy recoverer having an input electrically connected to said pulse conductor and having an output electrically connected to said variable magnitude pulse former recovery input, said energy recoverer being capable of recovering at least a portion of that energy stored in said pulse conductor as a result of a current pulse being transmitted therealong.

3. The system of claim 1 wherein said variable magnitude pulse former comprises:

a plurality of branch circuit portions each having at least one electrical impedance electrically connected through an intermediate connection means in series with an electrical capacitance between a first branch junction and a second branch junction with a selected one of said first branch junction and said intermediate connection means of at least one of said branch circuit portions being electrically connected to said magnitude control input, said first branch junction of each of said branch circuit portions being electrically connected to a selected one of said first branch junction and said intermediate connection means of at least one other of said branch circuit portions, said second branch junction of each of said branch circuit portions being electrically connected to a selected one of said second branch junction and said intermediate connection means of at least one other of said branch circuit portions;

a plurality of switching devices including a first switching device each having first and second terminating regions and a control region therein by which such switching device is capable of being directed to effectively provide a conductive path of a selected conductivity between its first and second terminating regions, said first switching device first and second terminating regions each being electrically connected to a corresponding one of a pair of said branch circuit portions at a said intermediate connection means therein so as to have one of these said terminating regions connected between said first branch junction and said electrical capacitance of one branch circuit portion of said pair and that remaining one of these terminating regions connected between said electrical capacitance and said second branch junction of that other branch circuit portion remaining in said pair; and

a pulse initiation transferor having an input electrically coupled to said pulse initiation input and an output electrically coupled to a selected one of said switching device control regions and said branch circuit portions, said pulse initiation transferor being capable of supplying a switching signal at said output thereof in response to receiving an initiation signal at said input thereof directing that an electrical pulse be provided at said generator output, said first switching device control region being electrically coupled to a selected one of said pulse initiation transfer output and said branch circuit portions.

4. The system of claim 1 wherein said magnitude control signal generator is formed by a regulated voltage supply having a regulated voltage output serving as said magnitude control signal generator output, and having a variable reference value input serving as said magnitude control signal generator input, said regulated voltage supply having an energization input adapted for connection to a supply of voltage.

5. The system of claim 1 wherein said current pulse magnitude sensor has a sensing resistance connected to said input thereof to be in series with said pulse conductor, and has a voltage sensor provided across said sensing resistance having an output connected to said current pulse magnitude sensor output.

6. The system of claim 1 wherein said pulse controller is capable of terminating a said initiation signal after receipt of a said current pulse magnitude sensor output signal to thereby terminate a corresponding current pulse at said output of said pulse former.

7. The apparatus of claim 1 wherein said pulse controller is capable of providing a magnitude control signal at said selection output thereof of a selected value.

8. The system of claim 1 wherein said pulse conductor provides a current pulse transmitted therealong also along a sonic waveguide.

9. The system of claim 2 wherein said energy recoverer is a diode.

10. The apparatus of claim 3 wherein said electrical impedance is a selected one of a diode and a resistive impedance.

11. An electrical pulse generator having an energization input adapted for connection to a source of electrical energy, and having a pulse initiation input and having an output, said generator comprising:

a plurality of branch circuit portions each having at least one electrical impedance electrically connected through an intermediate connection means in series with an electrical capacitance between a first branch junction and a second branch junction with a selected one of said first branch junction and said intermediate connection means of at least one of said branch circuit portions being electrically to said energization input, said first branch junction of each of said branch circuit portions being electrically connected to a selected one of said first branch junction and said intermediate connection means of at least one other of said branch circuit portions, said second branch junction of each of said branch circuit portions being electrically connected to a selected one of said second branch junction and said intermediate connection means of at least one other of said branch circuit portions;

a plurality of switching devices including a first switching device each having first and second terminating regions and a control region therein by which such switching device is capable of being directed to effectively provide a conductive path of a selected conductivity between its first and second terminating regions, said first switching device first and second terminating regions each being electrically connected to a corresponding one of a pair of said branch circuit portions at a said intermediate connection means therein so as to have one of these said terminating regions connected between said first branch junction and said electrical capacitance of one branch circuit portion of said pair and that remaining one of these terminating regions connected between said electrical capacitance and said second branch junction of that other branch circuit portion remaining in said pair; and

a pulse initiation transferor having an input electrically coupled to said pulse initiation input and an output electrically coupled to a selected one of said switching device control regions and said branch circuit portions, said pulse initiation transferor being capable of supplying a switching signal at said output thereof in response to receiving an initiation signal at said input thereof directing that an electrical pulse be provided at said generator output, said first switching device control region being electrically coupled to a selected one of said pulse initiation transferor output and said branch circuit portions.

12. The apparatus of claim 11 wherein a second switching device in said plurality of switching devices has its first and second terminating regions each being electrically connected to a corresponding one of a pair of said branch circuit portions at a said intermediate connection means therein such as to be so connected between said first branch junction and said capacitance of one and between said capacitance and said second branch junction of that other remaining in said pair, said second switching device control region being electrically coupled to a said intermediate connection means in a corresponding one of said branch circuit portions.

13. The apparatus of claim 11 wherein a second switching device in said plurality of switching devices has its first and second terminating regions each being electrically connected to a corresponding one of a pair of said branch circuit portions at a said intermediate connection means therein such as to be so connected between said first branch junction and said capacitance of one and between said capacitance and said second branch junction of that other remaining in said pair, said second switching device control region being electrically coupled to said pulse initiation transferor output.

14. The apparatus of claim 11 wherein said pulse initiation transferor is a direct interconnection.

15. The apparatus of claim 11 wherein said pulse initiation transferor a pulse adaptor capable of providing an electrical pulse at said output thereof differing from that pulse occurring in said initiation signal provided at said input thereof.

16. The apparatus of claim 11 wherein said electrical impedance is a resistive impedance.

17. The apparatus of claim 11 wherein said electrical impedance is a diode.

18. The apparatus of claim 12 wherein each of said control regions of said plurality of switching devices other than said first switching device is electrically connected to a terminating region of another of said switching devices.

19. The apparatus of claim 13 wherein each of said control regions of each said plurality of switching devices other than said first switching device is electrically connected to said pulse initiation transferor output.

20. The apparatus of claim 18 wherein any particular switching device in said plurality thereof other than said first switching device has its control region electrically connected to a said terminating region of that said switching device having its other terminating region electrically connected by a said electrical capacitance to a terminating region of that said particular switching device.

21. A current pulse generation system for generating current pulses on an electrical pulse conductor, said current pulse generation system comprising:

an electrical current charging source adapted for connection to a supply of electrical energy and having an output;

a pulse forming circuit having an output and having an input electrically connected to said charging source output, said pulse forming circuit further comprising;

a plurality of capacitors; and

a plurality of switches electrically connected with said capacitors in said plurality thereof so as to be able to switch each said capacitor between being charged in parallel with those other said capacitors in said plurality thereof from said pulse forming circuit input to being electrically connected in series with those other said capacitors in said plurality thereof and with said pulse forming circuit output;

an electrical load electrically connected to said pulse forming circuit output and capable of storing electrical energy therein; and

an energy recoverer connected between said electrical load and said pulse forming circuit and capable of accommodating transfers of at least some of any electrical energy stored in said load to said pulse forming circuit.

22. The apparatus of claim 21 wherein said plurality of capacitors are connected in parallel from said pulse forming circuit input with one side thereof oriented toward, and that remaining side oriented away, from said pulse forming circuit input, and wherein said switches are transistor devices interconnected between adjacent ones of said plurality of capacitors connected as aforesaid so as to have one terminal of each said transistor device electrically connected on a side of a capacitor oriented toward said pulse forming circuit input but another terminal of that said transistor device connected on a side of an adjacent capacitor oriented away from said pulse forming circuit input.

23. The apparatus of claim 21 wherein said energy recoverer is a diode electrically connected between said electrical load at said pulse forming circuit output and said pulse forming circuit input.