Patent US4048638A successfully refreshed from Google Patents.
Patent EP0196543A2 successfully refreshed from Google Patents.
EP0196543A2
Expired / Lapsed
EP
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Current control of an inductive load
Assignee: Kollmorgen Technologies Corp
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Filing: 1986-03-18
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Granted: —
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Expires: 2006-03-18
Abstract
Abstract In a control system for an inductive load, the actual current in the inductive load is maintained within a small range of an ideal current. When used to control an inductive load such as an electric motor, an H-bridge type configuration of serially connected pairs of photosensitive switches and diodes is used to apply voltages to the inductive load. A control circuit which preferably includes an operational amplifier generates the necessary signals to operate the switches such that the actual current closely approximates the ideal current.
Inventors
- 👤 Rolf Eichenwald
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 07:58
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/2805; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/525; H02M7/527; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/1555
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
An apparatus for regulating the current in an inductive load, characterized in that it comprises first switching means for applying a voltage having a first polarity to the inductive load within a predetermined time such that the current in the inductive load increases until the current reaches a maximum value within a desired range, and for allowing the current in'the inductive load to decrease until the current reaches a minimum value within the desired range; and control means responsive to a command signal and a signal indicative of the current in the inductive load for operating said first switching means.
Claim 2
Independent Claim
100 words
An apparatus for regulating the current in an inductive load, characterized in that it comprises first switching means for applying a voltage having a first polarity to the inductive load within a predetermined time such that the current in the inductive load increases until the current reaches a maximum value within a desired range, and for allowing the current in'the inductive load to decrease until the current reaches a minimum value within the desired range; and control means responsive to a command signal and a signal indicative of the current in the inductive load for operating said first switching means.
Claim 3
Dependent Claim
77 words
The apparatus of claim 1, characterized in that it further comprises second switching means responsive to said control means for applying a voltage having a second polarity to the inductive load within a predetermined time such that the current in the inductive load decreases until the current reaches a minimum value within the desired range, and for allowing the current in the inductive load to increase until the current reaches a maximum value within the desired range.
Claim 4
Dependent Claim
17 words
The apparatus of claim 2 wherein said control means include an operational amplifier having a feeback loop.
Claim 5
Dependent Claim
47 words
The apparatus of claim 3 wherein said first and second switching means each include two pairs of photosensitive switches which are responsive to two pairs of serially connected light emitting diodes, said pairs of diodes being oppositely poled and coupled to the output of said operational amplifier.
Claim 6
Dependent Claim
41 words
The apparatus of claim 4 wherein said feedback loop includes first resistance means and the command signal and the current signal indicative of the inductive load are coupled to the input of said operational amplifier by second and third resistance means.
Claim 7
Independent Claim
114 words
A method for regulating the current of an inductive load comprising the steps of applying a positive voltage to the inductive load within a predetermined time period which causes the current in the inductive load to be offset by a positive value and to increase until the current reaches a maximum positive value within a desired range; and 'allowing the current in the inductive load to decrease until the current reaches a minimum positive value within the desired range, characterized in that the steps of applying voltage and allowing the current to decay are repeated such that the actual current flowing through the inductive load follows within a small range of a command current.
Claim 8
Independent Claim
114 words
A method for regulating the current of an inductive load comprising the steps of applying a positive voltage to the inductive load within a predetermined time period which causes the current in the inductive load to be offset by a positive value and to increase until the current reaches a maximum positive value within a desired range; and 'allowing the current in the inductive load to decrease until the current reaches a minimum positive value within the desired range, characterized in that the steps of applying voltage and allowing the current to decay are repeated such that the actual current flowing through the inductive load follows within a small range of a command current.
Claim 9
Dependent Claim
74 words
The method of claim 6 further including the steps of applying a negative voltage to the inductive load within the predetermined time period which causes the current in the inductive load to be offset by a negative value and to decrease until it reaches a maximum negative value within a desired range; and allowing the current in the inductive load to increase until the current reaches a minimum negative value within the desired range
References Cited (Backward Citations)
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