Patent US5058710A successfully refreshed from Google Patents.
US5058710A
Expired / Lapsed
US
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Elevator power source device
Assignee: Otis Elevator Co
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Filing: 1990-08-14
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Granted: 1991-10-22
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Expires: 2010-08-14
Abstract
Abstract A simplified elevator power system using an AC-DC converter, both to convert AC to DC during normal operation and to convert stored DC power to AC during power failures. A power source monitoring relay monitors AC power coming from a utility, and upon power failure, switches a battery from a charging mode to a power source mode wherein DC power is supplied, not only to an inverter for driving a motor, but also to a converter hooked up to run as an inverter during such power failure in order to provide stepped-up AC voltage to elevator control devices. In this way, the prior art addition of an extra inverter is avoided.
Inventors
- 👤 Masao Iwasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:37
CPC Classifications
B; B66; B66B; B66B5/00; B66B5/02; Y; Y02; Y02B; Y02B50/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
An elevator power source device comprising: a power source monitoring relay connected to power lines supplying AC power from a commercial power source; an AC-DC converter which has its input side connected to said power lines; a DC-AC inverter which has its input side connected to an output side of said AC-DC converter and is used to control a motor; a battery connected to said output side of said AC-DC converter via contacts (in the case of power failure) of said power source monitoring relay; a battery charger which is connected to said power lines via contacts (in the case of power failure) of said power source monitoring relay; a step-up transformer which is connected to the input side of said AC-DC converter via contacts (in the case of power failure) of said power source monitoring relay, and which generates an elevator control voltage; and a converter switch circuit which is connected to said power source monitoring relay and said AC-DC converter, which controls the transistors of said AC-DC converter without power failure so that said AC-DC converter operates as an AC-DC converter, and which controls the transistors of said AC-DC converter during power failure so that said AC-DC converter operates as a DC-AC inverter.
Claim 2
Dependent Claim
205 words
An elevator power source device comprising: a power source monitoring relay connected to power lines supplying AC power from a commercial power source; an AC-DC converter which has its input side connected to said power lines; a DC-AC inverter which has its input side connected to an output side of said AC-DC converter and is used to control a motor; a battery connected to said output side of said AC-DC converter via contacts (in the case of power failure) of said power source monitoring relay; a battery charger which is connected to said power lines via contacts (in the case of power failure) of said power source monitoring relay; a step-up transformer which is connected to the input side of said AC-DC converter via contacts (in the case of power failure) of said power source monitoring relay, and which generates an elevator control voltage; and a converter switch circuit which is connected to said power source monitoring relay and said AC-DC converter, which controls the transistors of said AC-DC converter without power failure so that said AC-DC converter operates as an AC-DC converter, and which controls the transistors of said AC-DC converter during power failure so that said AC-DC converter operates as a DC-AC inverter.
Claim 3
Dependent Claim
124 words
Apparatus for use during a primary power failure in a motor drive having an AC to DC converter, a DC link, a DC to AC inverter, means for sensing AC provided to an AC port of said AC to DC converter for providing an AC failure signal in the presence of a primary power failure and means for providing stored DC to said DC link in response to said failure signal, comprising: means, responsive to said failure signal, for providing a first control signal to said AC to DC converter in the absence of said failure signal; and means for providing a second control signal to said AC to DC converter, in response to said failure signal, for providing AC at said first port.
Claim 4
Dependent Claim
124 words
Apparatus for use during a primary power failure in a motor drive having an AC to DC converter, a DC link, a DC to AC inverter, means for sensing AC provided to an AC port of said AC to DC converter for providing an AC failure signal in the presence of a primary power failure and means for providing stored DC to said DC link in response to said failure signal, comprising: means, responsive to said failure signal, for providing a first control signal to said AC to DC converter in the absence of said failure signal; and means for providing a second control signal to said AC to DC converter, in response to said failure signal, for providing AC at said first port.
Claim 5
Independent Claim
103 words
A method for use during a primary power failure in a motor drive having an AC to DC converter, a DC link and a DC to AC inverter, comprising the steps of: sensing AC provided to a first port of said AC to DC converter for providing an AC failure signal in the presence thereof; providing stored DC to a second port of said AC to DC converter connected to said DC link, in response to said failure signal; and providing a control signal to said AC to DC converter, in response to said failure signal, for providing AC at said first port.
Claim 6
Independent Claim
103 words
A method for use during a primary power failure in a motor drive having an AC to DC converter, a DC link and a DC to AC inverter, comprising the steps of: sensing AC provided to a first port of said AC to DC converter for providing an AC failure signal in the presence thereof; providing stored DC to a second port of said AC to DC converter connected to said DC link, in response to said failure signal; and providing a control signal to said AC to DC converter, in response to said failure signal, for providing AC at said first port.
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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) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |