Power management circuit for a magnetic repulsion punch

• US 5,222,012 A
• Filed: 01/17/1991
• Issued: 06/22/1993
• Est. Priority Date: 01/17/1991
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Ngo, Thai Q., Frankeny, Richard F., Frankeny, Jerome A.
• Primary Examiner(s): Pellinen, A. D.
• Assistant Examiner(s): Elms, Richard T.
• Application Number:
  US07/642,504
• Time in Patent Office: 887 Days
• Field of Search: 361/155, 361/156, 361/152, 361/143, 361/166, 361/169.1, 361/153, 361/168.1, 361/209, 361/154, 307/38, 307/39, 307/41, 425/3, 83/76.1, 83/577, 83/575
• US Class Current: 361/156
• CPC Class Codes: B30B 1/42 by magnetic means, e.g. electromagnetic
• CPC Class Codes: H03K 3/57 the switching device being a semiconductor device
• CPC Class Codes: Y10T 83/162 With control means responsive to replaceable or selectable information program
• CPC Class Codes: Y10T 83/8765 Magnet- or solenoid-actuated tool

Abstract

A power management circuit for operating a magnetic repulsion punch comprising a storage capacitor arranged to be connected in parallel with an inductive load serving as an operating coil of the magnetic repulsion punch, a means for selectively and temporarily coupling the inductive load to the storage capacitor for forming a resonant circuit, and a means for charging the storage capacitor after each operation.

Claims

1. A bipolar power management circuit for operating at least one magnetic repulsion punch comprising:

a storage capacitor;

means for charging said storage capacitor in alternating polarities, including;

a rectified power supply;

a pair of charging circuits, each coupled in series with said storage capacitor and said rectified power supply and coupled in parallel with each other and in polarity opposite to the polarity of the other of said charging circuits by a pair of SCRs for each charging circuit, each SCR of said pair of SCRs coupled in series with one leg of said storage capacitor and having like polarity to each other, each pair of SCRs further having polarity opposite that of said pair of SCRs for the other of said charging circuits; and

a control circuit for each pair of SCRs in said charging circuits for causing said SCRs in a selected one of said charging circuits to conduct in response to a control signal for charging said storage capacitor to alternating polarities;

at least one inductive load comprising an operating coil of said magnetic repulsion punch; and

means for selectively and temporarily coupling each said inductive load to said storage capacitor for forming a resonant circuit between said storage capacitor and said inductive load wherein a high amplitude current pulse is generated in said resonant circuit for operating said magnetic repulsion punch.

2. The bipolar power management circuit according to claim 1 for operating at least one magnetic repulsion punch wherein said means for selectively and temporarily coupling and decoupling said inductive load to said storage capacitor further comprises:

a pair of silicon controller rectifiers (SCRs) coupled manually in parallel and in opposite polarity to each other and together coupled in series with said inductive load;

a pair of balanced triggering circuits for said pair of SCRs for causing an SCR of appropriate polarity of said pair of SCRs to conduct, thereby forming said resonant circuit, causing said storage capacitor to discharge and current to flow in the resonant circuit and operating said magnetic repulsion punch.

3. The bipolar management circuit for operating at least one magnetic repulsion punch according to claim 1 and further providing:

sensing means for measuring current and voltage in said resonant circuit.

4. The bipolar management circuit for operating at least one magnetic repulsion punch according to claim 3 wherein said sensing means comprises a sensing circuit coupled in parallel with said storage capacitor, said sensing circuit further comprising:

a sensing capacitor sized substantially smaller than said storage capacitor;

a biasing resistor connected in series with said sensing capacitor; and

a sensing terminal between said sensing capacitor and said biasing resistor for permitting measurement of voltage across said biasing resistor.

5. A bipolar power management circuit for operating multiple magnetic repulsion punches comprising:

a storage capacitor;

means for charging said storage capacitor to alternating polarities;

a plurality of inductive loads comprising operating coils of said magnetic repulsion punches and disposed in a closely spaced array;

means for selectively and temporarily coupling each of said plurality of inductive loads to said storage capacitor for forming a resonant circuit therewith, thereby causing said storage capacitor to discharge and a high amplitude current pulse to flow in said resonant circuit and operating each magnetic repulsion punch in sequence, said means for selectively and temporarily coupling including;

a pair of silicon controller rectifiers (SCRs) for each of said inductive loads coupled mutually in parallel and in opposite polarity to each other and together coupled in series with one of said inductive loads; and

a pair of balanced triggering circuits for each pair of SCRs, for causing one SCR of said pair of SCRs to conduct, thereby forming said resonant circuit with each said inductive load in sequence including;

two operating circuits, each powered from opposite legs of said storage capacitor and coupled in parallel to said storage capacitor, each of said operating circuits further having;

a triggering signal path coupled to one SCR of said pair of SCRs;

a first isolating means coupled in said triggering signal path between said operating circuit and said one SCR;

a second isolating means coupled in series with said operating circuit and a leg of said storage capacitor opposite a leg from which said operating circuit is powered; and

two enabling circuits powered from a low voltage source, each said enabling circuit coupled to one of said operating circuits, for responding to an enabling signal received by both balanced triggering circuits and for causing said operating circuit to emit a triggering signal to said one SCR if said storage capacitor is charged at a polarity like that of said operating circuit.

6. A bipolar management circuit for operating multiple magnetic repulsion punches comprising:

a storage capacitor;

means for charging said storage capacitor to alternating polarities, including;

a rectified power supply;

a pair of charging circuits, each of said charging circuits coupled in series with said storage capacitor and said rectified power supply and coupled in parallel with and in opposite polarity to the polarity of the other of said pair of charging circuits said charging circuits coupled to said storage capacitor through a pair of SCRs for each said charging circuit having like polarity, each SCR of said pair of SCRs further coupled in series with opposing legs of said storage capacitance, each pair of SCRs further coupled in polarity opposite that of said pair of SCRs for said other charging circuit; and

a triggering circuit for each pair of SCRs in said charging circuits for causing said SCRs in selected one of said charging circuits to conduct in response to a control signal for charging said storage capacitor to alternating polarities;

a plurality of inductive loads comprising operating coils of said magnetic repulsion punches and disposed in a closely spaced array;

means for selectively and temporarily coupling each of said plurality of inductive loads to said storage capacitor for forming a resonant circuit therewith, thereby causing said storage capacitor to discharge and a high amplitude current pulse to flow in said resonant circuit and operating each magnetic repulsion punch in sequence.