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| Number | Title | Issue Date |
| 5821491 | Multiple single phase weld control systems coupled to a polyphase power source A weld control system, supplied by a polyphase voltage source, consists of an isolation contactor supplying power to separate single phase weld controllers. The single phase weld control systems have their separate power modules combined into a single pow... | 10/13/1998 |
| 5815493 | I/O module for a serial multiple data system with a data bus integrity checker A programmable data link module is used on a time division multiplex data bus. The module receives data from the data bus during a selected time slot for a selected number of frames. The data link module includes an input circuit for generating a data out... | 09/29/1998 |
| 5808885 | Weld controller system for coupling to a common database system on a communication network A weld controller is coupled to a communications network which has an operator interface unit for monitoring and controlling the weld controller and other weld controllers on the network. A common database in the operator interface unit is accessible acro... | 09/15/1998 |
| 5779963 | Manufacturing process of an insulator A process of manufacturing an insulator having a central core and an insulating body fitted tightly around the central core includes interposing a flexible coating layer between a part of the central core and the insulating body. The flexible coating laye... | 07/14/1998 |
| 5764647 | Data link module for time division multiplexing control systems A programmable data link module (32) for use in a time division multiplexing control system (30) having a plurality of modules interconnected by a bus (40) for passing control signals between data link modules on a serial multiplex basis. Each module incl... | 06/09/1998 |
| 5760361 | Multiple single phase weld control systems from a polyphase power source A weld control system, supplied by a polyphase voltage source, consists of multiple and separate single phase weld controllers. The single phase weld control systems have their separate power modules combined into a single power module assembly for more e... | 06/02/1998 |
| 5652521 | Insulation monitoring system for insulated high voltage apparatus A non-ferrous current sensor is used to continuously measure the charging current magnitude in step-graded foil and paper insulation systems and capacitive insulation systems used on high voltage measurement and control apparatus such as instrument transf... | 07/29/1997 |
| 5640154 | Insulation monitoring system for insulated high voltage apparatus A non-ferrous current sensor is used to continuously measure the charging current magnitude in step-graded foil and paper insulation systems and capacitive insulation systems used on high voltage measurement and control apparatus such as instrument transf... | 06/17/1997 |
| 5631854 | Data link module for time division multiplexing control systems A programmable data link module (32) for use in a time division multiplexing control system (30) having a plurality of modules interconnected by a bus (40) for passing control signals between data link modules on a serial multiplex basis. Each module incl... | 05/20/1997 |
| 5611059 | Prelinked parameter configuration, automatic graphical linking, and distributed database configuration for devices within an automated monitoring/control system A user interface for a control structure comprising a controller, and physical devices coupled to the controller is disclosed. The controller is adapted to control and monitor the physical devices. The user interface is coupled to the controller for displ... | 03/11/1997 |
| 5596305 | Strip wound coil with reinforced edge layer insulation A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors coincident with layer insulation sheets that extend b... | 01/21/1997 |
| 5574378 | Insulation monitoring system for insulated high voltage apparatus A non-ferrous current sensor is used to continuously measure the charging current magnitude in step-graded foil and paper insulation systems and capacitive insulation systems used on high voltage measurement and control apparatus such as instrument transf... | 11/12/1996 |
| 5514964 | System for monitoring a dual voltage ungrounded system for leakage currents A system contained on a single isolation panel determines the hazard current of a dual voltage, ungrounded, polyphase system. The system uses a single isolation transformer having dual secondary windings for generating the dual voltages. A first line isol... | 05/07/1996 |
| 5471144 | System for monitoring the insulation quality of step graded insulated high voltage apparatus A non-ferrous current sensor is used to continuously measure the charging current magnitude in step-graded foil and paper insulation systems used on high voltage measurement and control apparatus such as instrument transformers and on the condenser bushin... | 11/28/1995 |
| 5465011 | Uninterruptible power supply with improved output regulation A microprocessor based uninterruptible power supply generates an AC electrical output power from an AC input source when the AC input source is within settable voltage limits and from an auxiliary source of DC power when the AC input source is outside sai... | 11/07/1995 |
| 5461772 | Method of manufacturing a strip wound coil to reinforce edge layer insulation A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors coincident with layer insulation sheets that extend b... | 10/31/1995 |
| 5461263 | Method of phase synchronization between two AC signals An uninterruptible power supply for supplying a load with AC output power generates the AC output power from an AC input source when the AC input source is within settable voltage limits and transfers to generating the AC output power from an auxiliary so... | 10/24/1995 |
| 5450328 | System for measuring line to ground impedance A line isolation monitor (LIM) indicates the maximum hazard current of an ungrounded polyphase power distribution system. The LIM is microcontroller based and continuously monitors a fault impedance for the distribution system. The fault impedance is dete... | 09/12/1995 |
| 5450315 | Apparatus using a neural network for power factor calculation A weld controller utilizes a neural network to compute power factor of a secondary circuit of a welding transformer supply power to a workpiece through a pair of welding electrodes. Phase controlled switches supply power to the transformer and the neural ... | 09/12/1995 |
| 5450306 | Closed loop pulse width modulator inverter with volt-seconds feedback control A closed loop pulse width modulator (PWM) inverter corrects for variations and distortion in the output AC voltage waveform caused by non-linearities of the switching devices or changes in the DC link voltage. A signal is generated that is a volt-seconds ... | 09/12/1995 |
| 5450268 | Method and apparatus for RMS current approximation A method and apparatus provides for a measurement technique which approximates the true rms value of a current waveform. The technique involves converting the current waveform to a voltage by rectification and determining the peak value and the average va... | 09/12/1995 |
| 5448491 | Monitor for an ungrounded system A line isolation monitor (LIM) indicates the maximum hazard current of an ungrounded polyphase power distribution system. The LIM is microcontroller based and continuously monitors a fault impedance of the distribution system. The fault impedance is deter... | 09/05/1995 |
| 5446682 | System for calibrating a line isolation monitor A line isolation monitor (LIM) indicates the maximum hazard current of an ungrounded polyphase power distribution system. The LIM is microcontroller based and continuously monitors a fault impedance for each phase of the distribution system. The fault imp... | 08/29/1995 |
| 5414609 | DC to DC/DC to AC power conversion system A pulse width modulation DC to DC converter operates in an open loop mode to convert the DC output of the AC to DC converter to a desired, predetermined DC level using pulse width modulation techniques and a switching configuration substantially similar t... | 05/09/1995 |
| 5396210 | Dry-type transformer and method of manufacturing A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors. Insulating material includes an apparatus to secure ... | 03/07/1995 |
| 5386096 | Progressive current limit control for a resistance welder A weld controller employs a stepper program for increasing heat boost in one percent increments or steps to provide compensation for contact tip wear. The weld controller acquires weld current data in the form of current samples for each step to create a ... | 01/31/1995 |
| 5383266 | Method of manufacturing a laminated coil to prevent expansion during coil loading A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The iron core is manufactured with stacked core steel. After the core is stacked, instead of using banding straps, a heat s... | 01/24/1995 |
| 5371666 | Average current mode control apparatus for an AC output amplifier A current mode control apparatus generates an AC power output from a DC input source. The apparatus includes a pulse width modulator (PWM) to produce gate drive signals for driving a power output section having an output inductor and connected across the ... | 12/06/1994 |
| 5369563 | Fast turn-off circuit for use with an AC bridge circuit A power output driver circuit that converts a DC voltage into an AC voltage includes a gate driver circuit for turning on electronic switching devices. The gate driver circuit allows for a rapid turn-off of the conducting electronic switching device by ha... | 11/29/1994 |
| 5337216 | Multichip semiconductor small outline integrated circuit package structure A semiconductor package houses a plurality of single two terminal semiconductor components. The package is a plastic or ceramic small outline integrated circuit package and is adapted for surface mounting. Each semiconductor element is in a die form and o... | 08/09/1994 |
| 5327349 | Method and apparatus for analyzing and recording downtime of a manufacturing process A method and apparatus records downtime and the probable cause of the downtime of a network of programmable logic controllers and other microprocessor based devices for controlling of a manufacturing process. The method and apparatus also records the tota... | 07/05/1994 |
| 5287353 | Apparatus for generating and sending a serial data packet for controlling a network of single point I/O devices A communication system between a microprocessor based device and a network of a plurality of remote input/output repeater modules that control various input and output devices uses a synchronous serial communications protocol. The microprocessor based dev... | 02/15/1994 |
| 5283781 | Apparatus for receiving and modifying a serial data packet from a communications network to indicate its status A series of remote input/output repeater modules connected on a synchronous serial communication network supervised by a programmable logic controller uses a synchronous serial communications protocol. The programmable logic controller contains a transmit... | 02/01/1994 |
| 5281857 | Self-checking interlock control system A self checking interlock modular control system allows for an unlimited number of interlocks to be connected into a single interlock control circuit. The interlock control system provides a method of determining if the components within each interlock mo... | 01/25/1994 |
| 5267393 | Method of manufacturing a strip wound coil to eliminate lead bulge A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors. Insulating material includes a means to secure the w... | 12/07/1993 |
