Patent US6011345A successfully refreshed from Google Patents.
US6011345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device and method for controlling transductive systems
Assignee: EMF INDUSTRIES Inc
•
Filing: 1997-02-07
•
Granted: 2000-01-04
•
Expires: 2017-02-07
Abstract
Abstract The present invention provides methods and systems for controlling transductive structures to achieve a desired performance objective. According to one aspect, the present invention provides a controller which simulates a synthetic admittance or impedance when coupled to a bicoupled device and effectively cancels the reactance of the bicoupled device. Cancelling the reactance of the bicoupled device allows energy to be reflected back into an energy storage portion of the circuit resulting in an energy efficient damping and/or control system.
Inventors
- 👤 John Murray
- 👤 Gareth J. Knowles
- 👤 Bruce L. Bower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:25
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/802
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
62 words
A method for synthesizing a generalized admittance comprising: sensing a current flowing through a load; calculating a voltage value corresponding to the sensed current to simulate a negative reactance when measured from the load; and controlling a switching circuit to produce an average voltage over a switching cycle across the load, the average voltage value being equal to the calculated voltage value.
Claim 2
Independent Claim
62 words
A method for synthesizing a generalized admittance comprising: sensing a current flowing through a load; calculating a voltage value corresponding to the sensed current to simulate a negative reactance when measured from the load; and controlling a switching circuit to produce an average voltage over a switching cycle across the load, the average voltage value being equal to the calculated voltage value.
Claim 3
Dependent Claim
92 words
The method of claim 1 wherein controlling the switching circuit to produce an average voltage value comprises: producing a first voltage pulse across the load for a first phase of the switching cycle and a second voltage pulse across the load for a second phase of the switching cycle, the first pulse and the second pulse having an average value over the switching cycle, the average value being equal to the calculated voltage value; and filtering the first pulse and the second pulse to present the average voltage value to the load.
Claim 4
Dependent Claim
60 words
The method of claim 1 further comprising storing a load current produced during the first phase in an inductor and returning the load current from the inductor to a power supply during the second phase; and storing a load current produced during the second phase in the inductor and returning the current to the power supply after the second phase.
Claim 5
Dependent Claim
118 words
A quasi active controller comprising: a bicoupled device having a predetermined reactance; a first current sensor coupled to the bicoupled device, the current sensor sensing a current flowing through the bicoupled device; a first signal processing device coupled to the current sensor, the signal processing device calculating a voltage value using a first predetermined transfer function; a control circuit coupled to the first signal processing device, the control circuit producing a control signal in response to the voltage value; and a switching circuit coupled to the control circuit and to the bicoupled device, the switching circuit receiving the control signal and producing a voltage responsive to the control signal to simulate a generalized admittance to the bicoupled device.
Claim 6
Dependent Claim
118 words
A quasi active controller comprising: a bicoupled device having a predetermined reactance; a first current sensor coupled to the bicoupled device, the current sensor sensing a current flowing through the bicoupled device; a first signal processing device coupled to the current sensor, the signal processing device calculating a voltage value using a first predetermined transfer function; a control circuit coupled to the first signal processing device, the control circuit producing a control signal in response to the voltage value; and a switching circuit coupled to the control circuit and to the bicoupled device, the switching circuit receiving the control signal and producing a voltage responsive to the control signal to simulate a generalized admittance to the bicoupled device.
Claim 7
Dependent Claim
74 words
The quasi active controller of claim 4 further comprising: a capacitor coupled in parallel with the bicoupled device; a current sensor coupled to the capacitor to measure a capacitor current; and a second signal processing device coupled to the current sensor, the second signal processing device producing a signal in response to the capacitor current and feeding the signal back to the switching circuit to enable the switching circuit to drive a reactive load.
Claim 8
Dependent Claim
15 words
The quasi active controller of claim 4 wherein the bicoupled device comprises a piezoelectric device.
Claim 9
Dependent Claim
15 words
The quasi active controller of claim 4 wherein the switching circuit comprises an H bridge.
Claim 10
Dependent Claim
15 words
The quasi active controller of claim 4 wherein the switching circuit comprises a half bridge.
Claim 11
Dependent Claim
114 words
A quasi active controller comprising: a bicoupled device having a predetermined reactance; a voltage sensor coupled to the bicoupled device, the voltage sensor sensing a voltage across the bicoupled device; a first signal processing device coupled to the voltage sensor, the first signal processing device computing a current value using a predetermined transfer function; a control circuit coupled to the signal processing device, the control circuit producing a control signal in response to the current value; and a switching circuit coupled to the control circuit and to the bicoupled device, the switching circuit receiving the control signal and producing a voltage responsive to the control signal to simulate a generalized admittance to the device.
Claim 12
Dependent Claim
114 words
A quasi active controller comprising: a bicoupled device having a predetermined reactance; a voltage sensor coupled to the bicoupled device, the voltage sensor sensing a voltage across the bicoupled device; a first signal processing device coupled to the voltage sensor, the first signal processing device computing a current value using a predetermined transfer function; a control circuit coupled to the signal processing device, the control circuit producing a control signal in response to the current value; and a switching circuit coupled to the control circuit and to the bicoupled device, the switching circuit receiving the control signal and producing a voltage responsive to the control signal to simulate a generalized admittance to the device.
Claim 13
Dependent Claim
73 words
The quasi active controller of claim 9 further comprising: a capacitor coupled in parallel with the bicoupled device; a current sensor coupled to the capacitor to sense a capacitor current; and a second signal processing device coupled to the current sensor, the second signal processing device producing a signal in response to the capacitor current and feeding the signal to the switching circuit to enable the switching circuit to drive a reactive load.
Claim 14
Dependent Claim
15 words
The quasi active controller of claim 9 wherein the bicoupled device comprises a piezoelectric device.
Claim 15
Dependent Claim
14 words
The quasi-active controller of claim 9 wherein the switching circuit comprises an H bridge.
Claim 16
Dependent Claim
14 words
The quasi-active controller of claim 9 wherein the switching circuit comprises a half bridge.
Claim 17
Independent Claim
131 words
A method for selecting optimal parameters for a synthetic active controller comprising: dividing a generalized admittance circuit into a first subcircuit, a second subcircuit, and a third subcircuit, the first subcircuit including a negative reactance element, the second subcircuit including a passive non-dissipative element, and the third subcircuit including a passive dissipative element; selecting a reactance value for the negative reactance element in the first subcircuit by determining and negating the reactance value for the bicoupled device; determining a range of values for the elements in the second and third subcircuits based on a predetermined performance objective; selecting an optimal value for the elements in the second and third subcircuits using conventional algorithms; and combining the optimized second and third subcircuits with the first subcircuit to form an optimal admittance controller.
Claim 18
Independent Claim
131 words
A method for selecting optimal parameters for a synthetic active controller comprising: dividing a generalized admittance circuit into a first subcircuit, a second subcircuit, and a third subcircuit, the first subcircuit including a negative reactance element, the second subcircuit including a passive non-dissipative element, and the third subcircuit including a passive dissipative element; selecting a reactance value for the negative reactance element in the first subcircuit by determining and negating the reactance value for the bicoupled device; determining a range of values for the elements in the second and third subcircuits based on a predetermined performance objective; selecting an optimal value for the elements in the second and third subcircuits using conventional algorithms; and combining the optimized second and third subcircuits with the first subcircuit to form an optimal admittance controller.
Claim 19
Dependent Claim
18 words
The method of claim 14 further comprising building a controller that implements the first and third subcircuits losslessly.
Claim 20
Dependent Claim
19 words
The method of claim 14 further comprising building a controller that implements the first, second, and third subcircuits losslessly.
References Cited (Backward Citations)
US4158787A
Cited
US4565940A
Cited
US4849668A
Cited
US4868447A
Cited
US5032753A
Cited
US5130948A
Cited
US5270607A
Cited
US5424596A
Cited
US5525853A
Cited
US5558477A
Cited
US5838092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-03 | 2003-07-05 | 2004-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-03 | 2007-07-05 | 2008-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-03 | 2011-07-05 | 2012-01-04 | $7700.00 | Window Closed / Lapsed |