US4748345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse conditioning circuit for controlling electrically controllable valves in a hydraulic control apparatus
Assignee: Kloeckner Ferromatik Desma GmbH
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Filing: 1987-04-08
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Granted: 1988-05-31
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Expires: 2007-04-08
Abstract
Abstract Pulse conditioning device for electrically controlling valves in hydraulic control apparatus whereby a regulating signal is transmitted to the actuator of the respective electrically controllable valve. A filter is connected to the input side of an isolating transformer and a unidirectional rectifier is serially connected to an input side of the isolating transformer through the filter. An oscillator generates a sinusoidal output signal and a summing amplifier receives both the regulating signal and the sinusoidal signal to provide an output signal which is input to the unidirectional rectifier. To complete a modular pair of identical circuits for the control circuit, a second unidirectional rectifier is serially connected to a second filter and also connected to the output side of the isolating transformer. The second filter provides a zero offset compensation, and an output buffer amplifier is connected to the output of the second filter for producing an output signal which is the regulating signal for the actuator of the electrically controllable valve.
Inventors
- 👤 Matthias Landgraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:25
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/06; G05B11/12; B; B29; B29C; B29C45/00; B29C45/17; B29C45/76; B29C45/82
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
153 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus whereby a regulating signal is transmitted to the actuator of the respective electrically controllable valve, comprising: an isolating transformer and a filter connected to the input side thereof and further comprising a unidirectional rectifier serially connected to an input side of said isolating transformer through said filter; an oscillator for generating a sinusoidal output signal; a summing amplifier receiving said regulating signal and said sinusoidal output signal and providing an output signal which is input to said unidirectional rectifier; said pulse conditioning device further comprising a second unidirectional rectifier serially connected to a second filter and connected to the output side of said isolating transformer; said second filter executing a zero offset compensation; and an amplifier connected to the output of said second filter for producing an output signal which is said regulating signal for the actuator of the electrically controllable valve.
Claim 2
Dependent Claim
153 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus whereby a regulating signal is transmitted to the actuator of the respective electrically controllable valve, comprising: an isolating transformer and a filter connected to the input side thereof and further comprising a unidirectional rectifier serially connected to an input side of said isolating transformer through said filter; an oscillator for generating a sinusoidal output signal; a summing amplifier receiving said regulating signal and said sinusoidal output signal and providing an output signal which is input to said unidirectional rectifier; said pulse conditioning device further comprising a second unidirectional rectifier serially connected to a second filter and connected to the output side of said isolating transformer; said second filter executing a zero offset compensation; and an amplifier connected to the output of said second filter for producing an output signal which is said regulating signal for the actuator of the electrically controllable valve.
Claim 3
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 1, wherein said isolating transformer has a ferrite core.
Claim 4
Dependent Claim
28 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 1, wherein at least one of said unidirectional rectifiers is an active unidirectional rectifier.
Claim 5
Dependent Claim
24 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 3, wherein said active unidirectional rectifier has a linear characteristic.
Claim 6
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 1, wherein said filter and said second filter are active filters.
Claim 7
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 2, wherein said filter and said second filter are active filters.
Claim 8
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 3, wherein said filter and said second filter are active filters.
Claim 9
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 4, wherein said filter and said second filter are active filters.
Claim 10
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 5, wherein said filter is a critically damped filter.
Claim 11
Dependent Claim
27 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 9, wherein said critically damped filter is a filter of the second order.
Claim 12
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 1, wherein said second filter is a Bessel filter.
Claim 13
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 2, wherein said second filter is a Bessel filter.
Claim 14
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 3, wherein said second filter is a Bessel filter.
Claim 15
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 4, wherein said second filter is a Bessel filter.
Claim 16
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 5, wherein said second filter is a Bessel filter.
Claim 17
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 6, wherein said second filter is a Bessel filter.
Claim 18
Dependent Claim
23 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 7, wherein said second filter is a Bessel filter.
Claim 19
Dependent Claim
26 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 11, wherein said Bessel filter is a filter of the fourth order.
Claim 20
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 1, wherein said second filter additionally functions as a summer circuit.
Claim 21
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 11, wherein said second filter additionally functions as a summer circuit.
Claim 22
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 12, wherein said second filter additionally functions as a summer circuit.
Claim 23
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 13, wherein said second filter additionally functions as a summer circuit.
Claim 24
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 14, wherein said second filter additionally functions as a summer circuit.
Claim 25
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 15, wherein said second filter additionally functions as a summer circuit.
Claim 26
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 16, wherein said second filter additionally functions as a summer circuit.
Claim 27
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 17, wherein said second filter additionally functions as a summer circuit.
Claim 28
Dependent Claim
25 words
Pulse conditioning device for electrically controllable valves in hydraulic control apparatus according to claim 18, wherein said second filter additionally functions as a summer circuit.
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |