ABRAM PAUL DANCY
Pilots at Prospect St, Shrewsbury, MA
License number
Massachusetts A4965287
Issued Date
Jul 2015
Expiration Date
Jul 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
182 Prospect St, Shrewsbury, MA 01545
Personal information
See more information about ABRAM PAUL DANCY at radaris.comName
Address
Phone
182 Prospect St APT 186, Shrewsbury, MA 01545
16 Greenwood Ave, Shrewsbury, MA 01545
182 Prospect St #186, Shrewsbury, MA 01545
540 Memorial Dr #3, Cambridge, MA 02139
93 Medford St #3, Malden, MA 02148
Professional information
Interleaved Power Converters Incorporating Bang-Bang Control
US Patent:
2002004, Apr 25, 2002
Filed:
Aug 17, 2001
Appl. No.:
09/932839
Inventors:
Abram Dancy - Shrewsbury MA, US
Leif LaWhite - Acton MA, US
Leif LaWhite - Acton MA, US
Assignee:
SynQor Inc. - Hudson MA
International Classification:
H02M001/00
US Classification:
363/065000
Abstract:
Bang or bang-bang control is applied to interleaved power converters. With the bang control on, oscillator signals applied to the power converters are overridden in order to change the power output of both power converters. When the override is removed, both oscillating signals continue from points in their cycles at which they were overridden. An oscillator may be frozen during override by interrupting the charging and discharging of a capacitor in the oscillator.
Method For Mechanical Packaging Of Electronics
US Patent:
8644027, Feb 4, 2014
Filed:
Jul 16, 2010
Appl. No.:
12/838051
Inventors:
Lennart Pitzele - Princeton MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - North Thetford VT, US
Rene Hemond - Plainville MA, US
Martin F. Schlecht - Lexington MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - North Thetford VT, US
Rene Hemond - Plainville MA, US
Martin F. Schlecht - Lexington MA, US
Assignee:
SynQor, Inc. - Boxborough MA
International Classification:
H05K 5/00
US Classification:
361752, 361800
Abstract:
Electronics mounted on a printed circuit board are housed within a high conductivity case with connecting pins extending therethrough. The case is filled with thermally conductive potting material to provide thermal conduction from the printed circuit board to the case. The case may be a conduit having open ends through which the printed circuit board is inserted or it may comprise a cover mounted to a base plate.
Method For Mechanical Packaging Of Electronics
US Patent:
7765687, Aug 3, 2010
Filed:
Aug 11, 2006
Appl. No.:
11/503874
Inventors:
Lennart Pitzele - Princeton MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - North Thetford VT, US
Rene Hemond - Plainville MA, US
Martin F. Schlecht - Lexington MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - North Thetford VT, US
Rene Hemond - Plainville MA, US
Martin F. Schlecht - Lexington MA, US
Assignee:
SynQor, Inc. - Boxborough MA
International Classification:
H05K 7/14, H05K 7/20, H05K 13/00
US Classification:
29841, 29855, 174 51, 174521, 174526, 174528, 174548, 174551, 206706, 361736, 361740, 361753, 361759
Abstract:
Electronics mounted on a printed circuit board are housed within a high conductivity case with connecting pins extending therethrough. The case is filled with thermally conductive potting material to provide thermal conduction from the printed circuit board to the case. The case may be a conduit having open ends through which the printed circuit board is inserted or it may comprise a cover mounted to a base plate.
Control Of Dc/Dc Converters Having Synchronous Rectifiers
US Patent:
7119524, Oct 10, 2006
Filed:
Aug 3, 2004
Appl. No.:
10/910235
Inventors:
Joshua H. Bretz - Marlborough MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - Etna NH, US
Martin F. Schlecht - Lexington MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - Etna NH, US
Martin F. Schlecht - Lexington MA, US
Assignee:
Bank America, N.A. - New York NY
International Classification:
G05F 1/44, G05F 1/573
US Classification:
323274, 323275, 323277
Abstract:
A DC to DC power converter includes synchronous rectifiers which respond to a control waveform. Negative current from a load into the power converter is prevented by increasing the converter output voltage at a minimum current limit. The synchronous rectifiers may be held off in response to decision logic by activation of a hold-off circuit connected to a control terminal of a synchronous rectifier or of an ORing transistor at the converter output. When the synchronous rectifier is subsequently enabled, its control waveform may be increased slowly relative to the switching cycle.
Half-Bridge Isolation Stage Topologies
US Patent:
6927987, Aug 9, 2005
Filed:
Nov 13, 2002
Appl. No.:
10/293961
Inventors:
Richard Farrington - Heath TX, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - Lebanon NH, US
Martin F. Schlecht - Lexington MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - Lebanon NH, US
Martin F. Schlecht - Lexington MA, US
Assignee:
SynQor, Inc. - Boxborough MA
International Classification:
H02M003/335
US Classification:
363 5602
Abstract:
Half-bridge isolation stage topologies are provided in power converters, dividing an input voltage between capacitors. Primary transformer windings are periodically switched across respective capacitors. In current-fed implementations, the current flow through the primary windings is constrained as by an inductive element. In some implementations, a capacitor, primary winding and switch are connected in series in different orders in each of plural legs across the input. Current feed circuitry includes a current constraining component connecting nodes within each of respective legs. The switches of the isolation stage may be turned on with a fixed duty cycle, and a secondary circuit may comprise synchronous rectifiers.
Control Of Dc/Dc Converters Having Synchronous Rectifiers
US Patent:
6894468, May 17, 2005
Filed:
Jul 7, 2000
Appl. No.:
09/611383
Inventors:
Joshua H. Bretz - Marlborough MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - Etna NH, US
Martin F. Schlecht - Lexington MA, US
Abram P. Dancy - Shrewsbury MA, US
Leif E. LaWhite - Etna NH, US
Martin F. Schlecht - Lexington MA, US
Assignee:
Synqor, Inc. - Boxborough MA
International Classification:
G05F001/40, G05F001/56
US Classification:
323274, 323351, 323282
Abstract:
A DC to DC power converter includes synchronous rectifiers which respond to a control waveform. Negative current from a load into the power converter is prevented by increasing the converter output voltage at a minimum current limit. The synchronous rectifiers may be held off in response to decision logic by activation of a hold-off circuit connected to a control terminal of a synchronous rectifier or of an ORing transistor at the converter output. When the synchronous rectifier is subsequently enabled, its control waveform may be increased slowly relative to the switching cycle.
Charge Pump With Reduced Noise
US Patent:
2005011, May 26, 2005
Filed:
Jan 26, 2004
Appl. No.:
10/764823
Inventors:
Thomas Farkas - Marlborough MA, US
Abram Dancy - Shrewsbury MA, US
Leif La White - N. Thetford VT, US
Martin Schlecht - Lexington MA, US
Abram Dancy - Shrewsbury MA, US
Leif La White - N. Thetford VT, US
Martin Schlecht - Lexington MA, US
Assignee:
SynQor, Inc. - Boxborough MA
International Classification:
G05F003/02
US Classification:
327536000
Abstract:
A charge pump generates gate control voltage in a DC/DC converter. The input voltage to the charge pump may vary. To reduce noise at higher input voltages, a variable resistance is included in the charge pump and that resistance is controlled to vary with the input voltage.
Charge Pump Bypass
US Patent:
2004020, Oct 21, 2004
Filed:
Jan 26, 2004
Appl. No.:
10/764997
Inventors:
Thomas Farkas - Marlborough MA, US
Abram Dancy - Shrewsbury MA, US
Leif LaWhite - Thetford VT, US
Martin Schlecht - Lexington MA, US
Abram Dancy - Shrewsbury MA, US
Leif LaWhite - Thetford VT, US
Martin Schlecht - Lexington MA, US
Assignee:
SynQor, Inc. - Boxborough MA
International Classification:
G05F003/02
US Classification:
327/536000
Abstract:
A charge pump circuit in a gate controller provides a pumped gate control voltage to switches of a DC/DC converter. Different input voltages may be applied to the controller and an input voltage higher than the charge pump output could result in circuit damage. A clamp circuit between the input and output prevents the output voltage from being significantly below the input voltage to prevent such damage. The clamp circuit may be a transistor controlled by a comparator or amplifier.