US Patent No: 6,825,578

Number of patents in Portfolio can not be more than 2000

State machine controlled automatic transfer switch system

ALSO PUBLISHED AS: 20020117900

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
QAXU TECHNOLOGY, INC. (BRAD PEDERSEN)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 3 33

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ASCO POWER TECHNOLOGIES, L.P. (4)
5,070,252 Automatic transfer switch 44 1990
5,959,448 Optically isolated line voltage sensing circuit 6 1996
5,748,432 Method and apparatus for preventing coil induced delay in a automatic transfer switch 11 1996
5,784,240 Method and apparatus for limiting current surge upon transfer of a load between A.C. power sources 14 1996
 
Westinghouse Electric Corp. (4)
4,204,128 Adjustable time delay relay 9 1978
4,672,227 Automatic transfer switch with delay 27 1986
4,747,061 Automatic transfer switch for a wide range of source voltage 41 1986
5,581,133 Combination transfer and bypass isolation switch utilizing drawout protective devices and key interlocks 29 1993
 
AUTOMATIC SWITCH COMPANY (2)
4,189,649 Control panel for automatic transfer switch 16 1978
4,405,867 System for transferring a load between two power sources without interruption of power to the load 39 1980
 
GE ZENITH CONTROLS, INC. (2)
5,023,469 Interlock system for bypass/isolation automatic transfer switch 22 1990
5,739,594 Controller for automatic transfer switches 32 1996
 
GENERAC POWER SYSTEMS, INC. (2)
5,914,467 Automatic transfer switch with improved positioning mechanism 24 1997
6,172,432 Automatic transfer switch 77 1999
 
Brown Industrial Gas, Inc. (1)
4,804,933 Automatic transfer switch 13 1988
 
CREGIER ELECTRICAL MANUFACTURING CO., INC., 5060 N. KIMBERLY STREET, CHICAGO ILLINOIS, A CORP. OF ILLINOIS (1)
4,398,097 Automatic transfer switch 44 1982
 
DOMETIC, LLC (1)
6,034,445 Power source transfer lockout circuit 5 1998
 
Electric Equipment & Engineering Co. (1)
6,100,604 Method and apparatus for converting a manual transfer switch into an automatic transfer switch 25 1999
 
KABUSHIKI KAISHA TOSHIBA (1)
5,124,881 Enclosed switchgear 23 1984
 
ONAN CORPORATION (1)
4,423,336 Electromechanically controlled automatic transfer switch and bypass switch assembly 48 1982
 
RANTEC MICROWAVE & ELECTRONICS, INC. (1)
5,939,802 Automatic bus transfer device for single phase and multiphase power systems, providing infinite isolation 30 1997
 
Other [Check patent profile for assignment information] (6)
4,760,278 Transfer switch 40 1987
5,268,850 Automatic power-failure and auxiliary generator control 42 1991
5,734,239 Automatic generator start up and shut off device 18 1995
5,892,297 Power transfer system 3 1997
5,903,065 Power failure transfer switching system 11 1998
6,593,670 Automatic transfer switch and engine control 16 2000

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
AMERICAN POWER CONVERSION CORPORATION (11)
7,432,615 Uninterruptable power supply system and method 18 2004
7,142,950 Methods and apparatus for providing and distributing standby power 28 2004
7,360,529 Fuel level measurement and run time interpolation 4 2004
7,446,437 Apparatus and method for preventing an electrical backfeed 10 2005
7,418,314 Methods and apparatus for providing and distributing standby power 23 2006
7,992,433 Fuel level measurement and run time interpolation 0 2008
7,983,797 Methods and apparatus for providing and distributing standby power 3 2008
8,200,370 Energy reduction 8 2008
7,786,617 System and method for allocating power to loads 7 2009
RE43177 Apparatus and method for preventing an electrical backfeed 1 2010
8,521,336 Energy reduction 0 2012
 
SCHNEIDER ELECTRIC IT CORPORATION (4)
7,939,968 Method and apparatus for providing uninterruptible power 5 2004
7,514,815 System and method for allocating power to loads 21 2004
8,803,361 Apparatus and method for providing uninterruptible power 0 2011
8,670,872 Methods and apparatus for providing and distributing standby power 0 2011
 
Scheider Electric IT Corporation (1)
8,446,040 System and method for allocating power to loads 0 2010
 
SIEMENS INDUSTRY, INC. (1)
8,717,720 Systems and methods for providing arc fault and/or ground fault protection for distributed generation sources 0 2011

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
11.5 Year Payment $7400.00 $3700.00 $1850.00 May 30, 2016
Fee Large entity fee small entity fee micro entity fee
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00