State machine controlled automatic transfer switch system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO

6825578

APP PUB NO

20020117900A1

SERIAL NO

10055734

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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An automatic transfer switch system controls switching of power from a main source (utility power) to a backup source (generator) by using a state machine controller and low cost relay switches housed in a single electrical panel. The low power automated transfer switch system is well-suited for residential use and is less expensive and easier to install than conventional automatic transfer switches. The key to a low cost transfer switch is delivering power with low cost relays. This is accomplished by employing relay drive techniques that enable these devices to survive rigorous standards compliance testing. Preferably, the state machine controller measures utility and generator source compliance using an optical coupling arrangement, rather than a transformer. The automated transfer switch disconnects the utility and generator means through a circuit breaker providing for fast protection. The relay drive techniques disclosed provide a form of an electrical interlock. This is a key feature when seeking compliance standard approval. Essentially, an automated transfer system should not continuously be capable of backfeeding power from generator to utility, and the electrical interlock of the relays as taught by this invention prevents any such backfeeding.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
QAXU TECHNOLOGY, INC.MINNEAPOLIS, MN1

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Perttu, Joseph 1000 Lake Susan Hills Dr., Chanhassen, MN 55317 2 38

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Westinghouse Electric Corp. (3)
4672227 Automatic transfer switch with delay 28 1986
4747061 Automatic transfer switch for a wide range of source voltage 43 1986
* 5581133 Combination transfer and bypass isolation switch utilizing drawout protective devices and key interlocks 31 1993
 
Other [Check patent profile for assignment information] (6)
4760278 Transfer switch 42 1987
5268850 Automatic power-failure and auxiliary generator control 47 1991
5734239 Automatic generator start up and shut off device 21 1995
5892297 Power transfer system 3 1997
5903065 Power failure transfer switching system 13 1998
* 6593670 Automatic transfer switch and engine control 19 2000
 
DOMETIC, LLC (1)
6034445 Power source transfer lockout circuit 5 1998
 
RANTEC MICROWAVE & ELECTRONICS, INC. (1)
5939802 Automatic bus transfer device for single phase and multiphase power systems, providing infinite isolation 32 1997
 
Brown Industrial Gas, Inc. (1)
4804933 Automatic transfer switch 17 1988
 
ASCO POWER TECHNOLOGIES, L.P. (4)
5070252 Automatic transfer switch 58 1990
5959448 Optically isolated line voltage sensing circuit 14 1996
5748432 Method and apparatus for preventing coil induced delay in a automatic transfer switch 19 1996
5784240 Method and apparatus for limiting current surge upon transfer of a load between A.C. power sources 14 1996
 
GENERAC POWER SYSTEMS, INC. (2)
5914467 Automatic transfer switch with improved positioning mechanism 28 1997
* 6172432 Automatic transfer switch 92 1999
 
AUTOMATIC SWITCH COMPANY (1)
4405867 System for transferring a load between two power sources without interruption of power to the load 40 1980
 
ONAN CORPORATION (1)
4423336 Electromechanically controlled automatic transfer switch and bypass switch assembly 57 1982
 
GE ZENITH CONTROLS, INC. (2)
5023469 Interlock system for bypass/isolation automatic transfer switch 23 1990
5739594 Controller for automatic transfer switches 35 1996
 
CREGIER ELECTRICAL MANUFACTURING CO., INC., 5060 N. KIMBERLY STREET, CHICAGO ILLINOIS, A CORP. OF ILLINOIS (1)
4398097 Automatic transfer switch 47 1982
 
KABUSHIKI KAISHA TOSHIBA (1)
* 5124881 Enclosed switchgear 28 1984
 
Electric Equipment & Engineering Co. (1)
* 6100604 Method and apparatus for converting a manual transfer switch into an automatic transfer switch 26 1999
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
AMERICAN POWER CONVERSION CORPORATION (17)
7432615 Uninterruptable power supply system and method 23 2004
* 2005/0168,073 Uninterruptible power supply system and method 32 2004
* 7142950 Methods and apparatus for providing and distributing standby power 33 2004
* 2005/0278,075 Methods and apparatus for providing and distributing standby power 24 2004
7360529 Fuel level measurement and run time interpolation 5 2004
* 2006/0090,552 Fuel level measurement and run time interpolation 3 2004
7446437 Apparatus and method for preventing an electrical backfeed 18 2005
* 2007/0018,506 Apparatus and method for preventing an electrical backfeed 18 2005
* 7418314 Methods and apparatus for providing and distributing standby power 26 2006
* 2007/0055,409 Methods and apparatus for providing and distributing standby power 18 2006
7992433 Fuel level measurement and run time interpolation 0 2008
* 2008/0202,599 FUEL LEVEL MEASUREMENT AND RUN TIME INTERPOLATION 1 2008
7983797 Methods and apparatus for providing and distributing standby power 3 2008
* 2009/0046,415 METHODS AND APPARATUS FOR PROVIDING AND DISTRIBUTING STANDBY POWER 11 2008
7786617 System and method for allocating power to loads 9 2009
* 2009/0121,547 SYSTEM AND METHOD FOR ALLOCATING POWER TO LOADS 14 2009
RE43177 Apparatus and method for preventing an electrical backfeed 1 2010
 
KOHLER CO. (1)
9281716 Generator controller configured for preventing automatic transfer switch from supplying power to the selected load 0 2013
 
Scheider Electric IT Corporation (1)
8446040 System and method for allocating power to loads 1 2010
 
TRIPPE MANUFACTURING COMPANY (1)
9467006 Automatic transfer switch for three-phase applications 0 2014
 
SIEMENS INDUSTRY, INC. (2)
* 8717720 Systems and methods for providing arc fault and/or ground fault protection for distributed generation sources 0 2011
* 2012/0019,966 SYSTEMS AND METHODS FOR PROVIDING ARC FAULT AND/OR GROUND FAULT PROTECTION FOR DISTRIBUTED GENERATION SOURCES 33 2011
 
SCHNEIDER ELECTRIC IT CORPORATION (11)
7939968 Method and apparatus for providing uninterruptible power 10 2004
* 2006/0043,793 Method and apparatus for providing uninterruptible power 23 2004
7514815 System and method for allocating power to loads 32 2004
8200370 Energy reduction 15 2008
* 2010/0145,884 ENERGY SAVINGS AGGREGATION 11 2008
* 2011/0049,980 SYSTEM AND METHOD FOR ALLOCATING POWER TO LOADS 3 2010
8803361 Apparatus and method for providing uninterruptible power 1 2011
* 8670872 Methods and apparatus for providing and distributing standby power 0 2011
* 2012/0146,417 METHODS AND APPARATUS FOR PROVIDING AND DISTRIBUTING STANDBY POWER 1 2011
8521336 Energy reduction 1 2012
RE46093 Energy reduction 0 2014
 
ORACLE AMERICA, INC. (1)
* 2004/0199,844 Test system including a test circuit board including resistive devices 0 2003
* Cited By Examiner