Patent US5117174A successfully refreshed from Google Patents.
US5117174A
Expired / Lapsed
US
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Electric power system with line drop compensation
Assignee: Sundstrand Corp
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Filing: 1989-10-03
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Granted: 1992-05-26
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Expires: 2009-10-03
Abstract
Abstract An electric power system having line drop compensation includes a controllable electric power source having an output for supplying voltage to a power bus, a local voltage regulator for monitoring the output voltage of the power source and for producing a control signal representative of a desired nominal output voltage of the power source, and a remote voltage regulator for sensing voltage on the power bus at a point of regulation located away from the power source. The remote voltage regulator produces a pulse width modulated signal having a duty cycle representative of the voltage at the point of regulation. A pulse width to trim bias converter receives the pulse width modulated signal and produces the trim signal having a magnitude representative of the duty cycle of the pulse width modulated signal. This trim signal is combined with the control signal of the local voltage regulator to produce a modified control signal for controlling the output voltage of the power source to produce a predetermined voltage at the point of regulation.
Inventors
- 👤 Leland L. Kessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:22
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P2101/00; H02P2101/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
169 words
An electric power system having line drop compensation, said system comprising: a controllable electric power source having an output for supplying voltage to a power bus; a local voltage regulator for monitoring the output voltage of said power source and for producing a control signal representative of a desired nominal output voltage of said power source; a remote voltage regulator for sensing voltage on said power bus at a point of regulation located away from said power source, and for producing a pulse width modulated signal having a duty cycle representative of the voltage at said point of regulation; a pulse width to trim bias converter for receiving said pulse width modulated signal and for producing a trim signal having a magnitude representative of the duty cycle of said pulse width modulated signal; and means for combining said control signal with said trim signal to produce a modified control signal for controlling the output voltage of said power source to produce a predetermined voltage at said point of regulation.
Claim 2
Dependent Claim
169 words
An electric power system having line drop compensation, said system comprising: a controllable electric power source having an output for supplying voltage to a power bus; a local voltage regulator for monitoring the output voltage of said power source and for producing a control signal representative of a desired nominal output voltage of said power source; a remote voltage regulator for sensing voltage on said power bus at a point of regulation located away from said power source, and for producing a pulse width modulated signal having a duty cycle representative of the voltage at said point of regulation; a pulse width to trim bias converter for receiving said pulse width modulated signal and for producing a trim signal having a magnitude representative of the duty cycle of said pulse width modulated signal; and means for combining said control signal with said trim signal to produce a modified control signal for controlling the output voltage of said power source to produce a predetermined voltage at said point of regulation.
Claim 3
Dependent Claim
29 words
An electric power system as recited in claim 1, wherein: the response time of said trim bias converter is greater than the response time of said local voltage regulator.
Claim 4
Dependent Claim
24 words
An electric power system as recited in claim 1, wherein: said trim signal is independent of the magnitude of said pulse width modulated signal.
Claim 5
Dependent Claim
29 words
An electric power system as recited in claim 1, wherein: the duty cycle of said pulse width modulated signal is about 30% when said power bus is not loaded.
Claim 6
Dependent Claim
80 words
An electric power system as recited in claim 1, wherein said pulse width to trim bias converter comprises: a differential amplifier for receiving said pulse width modulated signal, and for producing an amplified pulse width modulated signal; means for comparing said amplified pulsed width signal with a reference signal; means for charging a capacitor when said amplified pulse width signal exceeds said reference signal; and means for producing said trim bias signal in response to the voltage on said capacitor.
Claim 7
Independent Claim
135 words
A method of line drop compensation in an electric power system, said method comprising the steps of: providing a controllable electric power source; connecting said controllable power source to a power bus; producing a control signal representative of a desired nominal output voltage of said power source; sensing voltage on said power bus at a point of regulation located away from said power source; producing a pulse width modulated signal having a duty cycle representative of the voltage at said point of regulation; producing a trim signal having a magnitude representative of the duty cycle of said pulse width modulated signal; and combining said control signal with said trim signal to produce a modified control signal for controlling the output voltage of said power source to produce a predetermined voltage at said point of regulation.
Claim 8
Independent Claim
135 words
A method of line drop compensation in an electric power system, said method comprising the steps of: providing a controllable electric power source; connecting said controllable power source to a power bus; producing a control signal representative of a desired nominal output voltage of said power source; sensing voltage on said power bus at a point of regulation located away from said power source; producing a pulse width modulated signal having a duty cycle representative of the voltage at said point of regulation; producing a trim signal having a magnitude representative of the duty cycle of said pulse width modulated signal; and combining said control signal with said trim signal to produce a modified control signal for controlling the output voltage of said power source to produce a predetermined voltage at said point of regulation.
Claim 9
Dependent Claim
26 words
A method of line drop compensation, as recited in claim 6, wherein: said trim signal is independent of the magnitude of said pulse width modulated signal.
Claim 10
Dependent Claim
31 words
A method of line drop compensation, as recited in claim 6, wherein: the duty cycle of said pulse width modulated signal is about 30% when said power bus is not loaded.
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |