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Dirk Boomgaard Phones & Addresses

  • 1734 Mountain View Dr, Monroeville, PA 15146 (724) 327-6328

Publications

Us Patents

Power Line Communication System

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US Patent:
49030060, Feb 20, 1990
Filed:
Feb 16, 1989
Appl. No.:
7/311502
Inventors:
Dirk J. Boomgaard - Monroeville PA
Assignee:
Thermo King Corporation - Minneapolis MN
International Classification:
H04M 1104
US Classification:
340310A
Abstract:
A power line communication system which includes an electrical power line having one or more loads which feed objectionable electrical noise back into the power line. The electrical noise is attenuated across a broad frequency range to enable effective communication over the power line by a directional common mode trap located between the point where the communication signals are applied to the power line and the source of the electrical noise. The trap requires only a capacitor for each electrical phase and a 1:1 transformer having a magnetic core and single turn, straight through windings. The trap is connected to provide a low impedance path to ground for the electrical noise, while providing a high impedance to ground for the communication signals.

Demodulator For Powerline Carrier Communications

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US Patent:
55044549, Apr 2, 1996
Filed:
Jan 30, 1995
Appl. No.:
8/380283
Inventors:
Kenneth E. Daggett - Murrysville PA
Dirk J. Boomgaard - Monroeville PA
Assignee:
Westinghouse Elec. Corp. - Pittsburgh PA
International Classification:
H03D 318
US Classification:
329304
Abstract:
A method for demodulating the carrier signal of powerline communication networks. The method involves demodulating an HDLC data body that had been modulated through differential phase shift keyed modulation. Under the method, the data body is split with data input into a single bit digital delay circuit which outputs a delayed or "previous" binary data bit. A "present" binary data bit is input to one input of an XNOR circuit and the previous binary data bit is input into a second input of the XNOR circuit. When the present binary data bit and the previous binary data bit have unlike phases the XNOR circuit outputs a first binary data bit value. When the present binary data bit and the previous binary data bit have like phases, the XNOR circuit outputs a second binary data bit value. Preferably, the demodulated data is input into a post detection filter. The demodulation method also preferably involves the step of processing the demodulated data through a receive data correlator, a data body state machine and a variable divide counter.

Elevator Door Control System

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US Patent:
47764333, Oct 11, 1988
Filed:
Jan 25, 1988
Appl. No.:
7/148394
Inventors:
James L. Lagree - Plum Borough PA
Richard A. Johnson - Murrysville PA
Dirk J. Boomgaard - Monroeville PA
Daphne C. D'Zurko - Parsippany NJ
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
B66B 1308
US Classification:
187103
Abstract:
A feedback controlled elevator door control system 30 having motoring and generating modes, including a DC motor 35 connected to a DC power supply 36 via a power bridge circuit 68. Protective features include a dynamic current limit reference 200 having a magnitude which changes with motor speed; control 116 for providing an object detection safety-stop speed pattern having parameters which are selectable independent of the door stopping portions of normal opening and closing speed patterns; a bridge monitor 66 which prevents the changing of door commands when motor reversal could cause a bridge short; a power supply monitor 40 which blocks door commands when the control voltage is below standard; and an over-voltage protection monitor 38 which protects against excessive voltage build-up on DC power supply components when the bridge circuit 68 pumps power back to the DC power supply 36 during a generating mode.

Transmission Of Data Via Power Lines

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US Patent:
49624962, Oct 9, 1990
Filed:
Oct 20, 1988
Appl. No.:
7/260343
Inventors:
Leonard C. Vercellotti - Oakmont PA
Dirk J. Boomgaard - Monroeville PA
Assignee:
ABB Power T & D Company Inc. - Blue Bell PA
International Classification:
H04J 1500
H04L 2732
US Classification:
370 11
Abstract:
A method for transmitting data in the form of a sequence of data words according to PLBus communications protocol in a channel (20) carrying data transmitted, according to a different protocol, in the form of timed bursts of a signal, comprising: producing (16) a carrier which is continuous at least for the duration of each data word; angularly modulating (14, 16) the carrier in accordance with the information contained in each data word; and transmitting the angularly modulated carrier in the channel (20).

Rod Position Indication System With Temperature Compensation

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US Patent:
47149264, Dec 22, 1987
Filed:
Oct 23, 1986
Appl. No.:
6/922792
Inventors:
James A. Neuner - Richland Township, Lebanon County PA
Dirk J. Boomgaard - Monroeville PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
G01C 1908
US Classification:
34087036
Abstract:
A position indication system for detecting the position of an elongated, metallic member which is linearly movable between first and second positions along an axis corresponding to its longitudinal dimension. A sensor is operatively associated with the member for producing a first output signal which corresponds to the position of the member and which fluctuates with changes in the temperature of the member. A temperature monitoring device is operatively associated with the member for monitoring its temperature and for producing a second output signal which varies in direct response to changes in the temperature of the member. A combining circuit is connected to the sensor and to the temperature monitoring device for receiving the first and second output signals and for producing a third output signal which represents the position of the member compensated for changes in temperature of the member.

Digital Rod Position Detector System

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US Patent:
46299831, Dec 16, 1986
Filed:
Oct 3, 1984
Appl. No.:
6/657423
Inventors:
Dirk J. Boomgaard - Monroeville PA
James A. Neuner - Richland Township, Allegheny County PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
G01B 714
US Classification:
324208
Abstract:
Coils placed at spaced locations along the path of an axially movable magnetically permeable and/or electrically conductive rod, which changes the impedance of each coil as it passes through, are connected in sets with each set comprising two series connected groups of equal numbers of parallel connected, non-adjacent coils energized by an a-c source. The voltage at the common node of each set of coils, which fluctuates as equal and unequal numbers of coils in the two groups in a given set are penetrated by the end of the rod, is compared with the voltage at the common node of a pair of series connected resistors, also energized by the a-c source, to generate one digit of an unambiguous, multi-digit, digital rod position signal. Since only one signal wire to the remote electronics is required for each set of coils, and since they only carry a voltage signal, the required wiring is minimized. Compensation is provided to maintain the location of the rod end relative to each coil at which the digital signal changes state despite variations in temperature and voltage.

Automatic Tensioning Control For Winding Stator Coils

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US Patent:
43818528, May 3, 1983
Filed:
May 6, 1982
Appl. No.:
6/375605
Inventors:
Herbert E. Ferree - Hempfield Township, Westmoreland County PA
Dirk J. Boomgaard - Monroeville PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
H02K 1504
H01F 4104
B65H 8100
US Classification:
242 713
Abstract:
An automatic tensioning control for winding stator coils characterized by a looper for winding lengths of wire into loops for stator coils, a reel of wire for paying off wire to the looper under controlled conditions, and tension sensing means between the reel and looper for measuring the tension on the wire and for providing an indicating signal for applying a restraining torque on the reel.

Bidirectional Bus Coupler Presenting Peak Impedance At Carrier Frequency

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US Patent:
46463194, Feb 24, 1987
Filed:
Feb 27, 1985
Appl. No.:
6/706079
Inventors:
Joseph C. Engel - Monroeville PA
Dirk J. Boomgaard - Monroeville PA
Leonard C. Vercellotti - Oakmont PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
H04L 514
US Classification:
375 7
Abstract:
A bidirectional coupling circuit is provided for carrier based communication and control networks in which a coupling transformer is employed having relatively decoupled primary and secondary windings which are each tuned to the carrier frequency. Separate secondary windings are wound on the same core leg, one of these secondary windings being employed as a transmitter winding which is referenced to a positive supply voltage and the other winding being employed as a receiver winding which is referenced to ground. The coupling transformer is arranged to have a relatively high input impedance at the carrier frequency but due to series resonant effects has a relatively low impedance for undesired signals on either side of the carrier frequency. An operational amplifier is connected to the receiver winding to provide high gain amplification for a signal received from the common network power line without loading the other windings of the transformer. A transistor or FET is connected in series with the transmitter secondary winding to a positive voltage supply so that a relatively high amplitude transmitter signal is produced on the common power line.
Dirk J Boomgaard from Monroeville, PA, age ~92 Get Report