US3746825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method for measuring input energy for an induction heating installation
Assignee: Park Ohio Holdings Corp
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Filing: 1971-09-30
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Granted: 1973-07-17
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Expires: 1991-09-30
Abstract
Abstract A system and method for measuring the energy applied to a workpiece in an induction heating installation which includes creating a power signal representative of the instantaneous power supplied to the workpiece and means for integrating the power signal with respect to time to create a resultant signal representative of the accumulated energy applied to the workpiece.
Inventors
- 👤 G Pfaffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:43
CPC Classifications
G; G01; G01R; G01R21/00; G01R21/08; H; H05; H05B; H05B6/00; H05B6/02; H05B6/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
A system for measuring the energy applied to a workpiece in an induction heating installation including a power supply, a coupling transformer with a primary and a secondary, an output circuit having a first portion connected to said power supply and including said primary and a second portion including said secondary, and an inductor connected to said second portion and magnetically coupled to said workpiece, said system comprising means for sensing the voltage in said second portion of said output circuit, means for sensing the current in said second portion of said output circuit, means for creating a D.C. voltage signal representative of the product of said sensed voltage and current and having a level proportional to the sensed current and voltage in said output circuit, means for integrating sAid voltage signal with respect to time to create a resultant signal of increasing slope function representative of energy input to said workpiece, control means responsive to said resultant signal, said control means including means for interrupting power to said inductor, and said interrupting means including means for disconnecting said power supply from said output circuit when said resultant signal reaches a preselected value.
Claim 2
Independent Claim
193 words
A system for measuring the energy applied to a workpiece in an induction heating installation including a power supply, a coupling transformer with a primary and a secondary, an output circuit having a first portion connected to said power supply and including said primary and a second portion including said secondary, and an inductor connected to said second portion and magnetically coupled to said workpiece, said system comprising means for sensing the voltage in said second portion of said output circuit, means for sensing the current in said second portion of said output circuit, means for creating a D.C. voltage signal representative of the product of said sensed voltage and current and having a level proportional to the sensed current and voltage in said output circuit, means for integrating sAid voltage signal with respect to time to create a resultant signal of increasing slope function representative of energy input to said workpiece, control means responsive to said resultant signal, said control means including means for interrupting power to said inductor, and said interrupting means including means for disconnecting said power supply from said output circuit when said resultant signal reaches a preselected value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |