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| Number | Title | Issue Date |
| 7746615 | Adaptive multi-level threshold system and method for power converter protection System and method for protecting a power converter. The system includes a compensation system configured to receive an input signal and generate a control signal, a cycle threshold generator configured to receive the control signal and generate a cycle threshold, an... | 06/29/2010 |
| 7369386 | Overcurrent protection for solid state switching system Current sensing resistors are connected directly to output terminals of MOSFETs forming the series switching stage of a PWM sinewave dimmer. An analog sensed current signal is coupled through an EMI resistant current link to comparators that provide an overcurrent i... | 05/06/2008 |
| 7355826 | Power supply apparatus capable of detecting abnormality of current flowing through drive circuit A current detection unit starts sampling of a motor current at the timing when the motor current has exceeded a threshold value, and holds a maximum motor current value for each prescribed operation cycle. An abnormality determination unit determines whether the max... | 04/08/2008 |
| 7352545 | Compressor terminal fault interruption method and apparatus A compressor terminal fault interruption method and interrupter for disconnecting power to a compressor terminal when terminal venting failure is imminent including a current sensing circuit for sensing current provided to the terminal by a power source and outputti... | 04/01/2008 |
| 7319574 | Arc fault detection apparatus, method and system for an underground electrical conductor A non-invasive underground arc fault detection apparatus is for an underground electrical conductor. The apparatus includes an electric circuit having an opening for admitting the electrical conductor therethrough. The electric circuit includes one or two transducer... | 01/15/2008 |
| 7301738 | Method and apparatus for minimally invasive network monitoring A method and apparatus for monitoring a communication network is provided. The network includes a plurality of node electronics units communicatively coupled to at least one central control processing unit through at least one network wherein each network includes a... | 11/27/2007 |
| 7301742 | Method and apparatus for accessing and activating accessory functions of electronic circuit breakers An electronic trip unit for a circuit breaker includes a programmed microprocessor and a module plug in removable signal communication with the microprocessor. The module plug includes a program identifier. The microprocessor recognizes the program identifier and ac... | 11/27/2007 |
| 7270790 | Sterilizer monitoring and controlling system and method A system and method are provided for monitoring and/or controlling a sterilization system. Briefly described, in architecture, the system can be implemented as follows. A current transformer is operatively associated with a source of power for a radiation source. A ... | 09/18/2007 |
| 7254001 | Circuit protection system A circuit protection system is provided that provides a dynamic delay time to an upstream circuit breaker if a fault is detected in a circuit where the dynamic delay time can be based upon the location of the fault, such as the nearest downstream circuit breaker. A ... | 08/07/2007 |
| 7248078 | Semiconductor device The semiconductor device according to the present invention comprises an output MOS transistor M0, an MOS transistor M3 connected between a gate G1 of the output MOS transistor M0 and a ground voltage GND, a parasitic transistor Tr1 | 07/24/2007 |
| 7228508 | Fail-safe thermal sensor apparatus and method A fail-safe thermal sensor is implemented in an integrated circuit such as a microprocessor. The fail-safe thermal sensor monitors the temperature of the integrated circuit and halt logic halts operation of the integrated circuit in response to the fail-safe thermal... | 06/05/2007 |
| 7218496 | Overcurrent protection circuit The voltage generator circuit includes a regulator, a first sensor circuit, and a second sensor circuit. The first sensor circuit includes a first transistor, a first resistor, and an error amplifier. When V1>Vth, the error amplifier senses an overcurrent con... | 05/15/2007 |
| 7170732 | Surge delay for current limiter A surge current delay time period is added to a current limit delay time period in order to permit a longer time for a possibly temporary larger-than-steady-state electrical current, such as for a start-up power requirement. A system is described for permitting a le... | 01/30/2007 |
| 7116007 | Protecting medium voltage inductive coupled device from electrical transients There is provided a method for protecting loads associated with power distribution system inductive signal couplers. The method includes (a) providing an inductive signal coupler having a first winding in series with a line conductor of a power distribution system, ... | 10/03/2006 |
| 7092229 | Electrical filter/protector, and methods of constructing and utilizing same A device for an electrical power system having a nonlinear load. The circuit is connected in series with the nonlinear load and is tuned to the third harmonic of the power source frequency. The circuit substantially eliminates the harmonic currents and neutral curre... | 08/15/2006 |
| 7072779 | Power management integrated circuit A power management integrated circuit for monitoring a parameter of a power system includes sensor interface circuitry, first logic, at least one random access memory, second logic, and a communication interface. The sensor interface circuitry is operative to receiv... | 07/04/2006 |
| 7038423 | Apparatus and method for ride through for AC induction motors A method and an apparatus for controlling ride through of an induction motor by detecting a power loss from a power supply connected to the induction motor, disconnecting the induction motor from the power supply, monitoring a line voltage of the power supply, monit... | 05/02/2006 |
| 7030769 | Monitor providing cause of trip indication and circuit breaker incorporating the same A circuit breaker with a thermal/magnetic trip device incorporates a monitor that senses the temperature of the bimetal and the amplitude of the load current to distinguish between a thermal and a magnetic trip. If the temperature of the bimetal is above a selected ... | 04/18/2006 |
| 7010438 | Integrated circuit with power monitoring/control and device incorporating same A power management integrated circuit for monitoring a parameter of a power system includes: an analog front end operative to receive and at least one of amplify, attenuate and filter analog signals representative of at least one of voltage and current in a power sy... | 03/07/2006 |
| 6995964 | Combination-type motor control with extended current range A motor control technique is disclosed in which a first algorithm controls interruption of power to a motor in a first current range. A second algorithm controls interruption of power in a second, higher current range. The algorithms may be adapted to specific motor... | 02/07/2006 |
| 6985784 | Configuring a centrally controlled circuit breaker protection system There is provided a computer-implemented method for configuring a centralized circuit breaker protection system. The method includes determining configuration data for a processor in the centralized circuit breaker protection system in accordance with a parameter re... | 01/10/2006 |
| 6975047 | Temperature-based cooling device controller apparatus and method A temperature-based cooling device controller is implemented in an integrated circuit such as a microprocessor. The temperature-based cooling device controller includes a register to store a threshold temperature value, a thermal sensor, and clock adjustment logic t... | 12/13/2005 |
| 6957161 | Information handling system including power supply self diagnostics An information handling system (IHS) is provided which includes a power supply with a self diagnostics feature. The power supply supplies power to a test load resistor for a predetermined brief test period. The test period selected is sufficiently short so that a re... | 10/18/2005 |
| 6956726 | Power protection device A power protection device includes a power source switching unit for shutting off the power supply from an AC power source according to an open control signal, a surge voltage protecting unit for outputting the open control signal when a surge voltage occurs, a leak... | 10/18/2005 |
| 6937134 | Reception of protection commands in a remote tripping device In order to receive protection commands in a remote tripping device, one or more signals is or are received, protection commands and combinations of protection commands are coded by means of an individual signal or by means of a predetermined combination of signals,... | 08/30/2005 |
| 6927563 | Method and device for current value determination using a current transformer which operates in the core saturation region The invention relates to a method for determining a value of a current using a current transformer that operates in the core saturation region. A peak value detector determines a peak value of one half-cycle of the secondary current. The peak value is stored in a st... | 08/09/2005 |
| 6903912 | Method for recognition and/or limiting the short-circuit state of a switching converter and switching converter The invention pertains to a method for detecting and/or limiting short-circuit or overcurrent states of a switching regulator, where the load current or a variable proportional to the load current is measured and compared with a predetermined maximum value, and wher... | 06/07/2005 |
| 6798630 | Trip device comprising an improved man-machine interface and circuit breaker comprising such a trip device The electronic trip device includes a processing unit having inputs to receive electrical signals representative of electrical quantities and an output to supply a tripping signal to a tripping relay, and a man-machine interface connected to the processing unit to s... | 09/28/2004 |
| 6788513 | Switching power supply circuit A switching power supply circuit is protected from degradation and breakage of a MOS transistor when the inductive load is short-circuited or overloaded. To do this, the magnitude of the load current flowing through the MOS transistor is detected by a differential a... | 09/07/2004 |
| 6788514 | Method and apparatus for fault condition protection of a switched mode power supply Methods and apparatuses for fault condition protection of a switched mode power supply. In one aspect of the invention, a power supply circuit having an auto-restart function to turn the power supply on and off repeatedly under fault conditions is included. In one e... | 09/07/2004 |
| 6683766 | DC arc detection and prevention circuit and method A circuit and method are disclosed for detecting an imminent arc prior to the ignition of the arc in a system having a DC power supply that provides power to a load through a conductor. The inventive circuit includes a current-change detector that detects... | 01/27/2004 |
| 6633474 | Selective electronic tripping element The instantaneous tripping threshold of the selective tripping device is a decreasing function of a quantity representative of the time necessary for the current to reach the peak value. The variation curve is disposed between first and second curves, obt... | 10/14/2003 |
| 6625551 | Fault current and differential current detection system capable of preventing spurious triggering of a protection system due to transient interference pulses A fault or differential current detection system is provided. The detection system detects a fault or differential current generated on a conductive path supplying power to an electric device and prevents the fault or differential current from being suppl... | 09/23/2003 |
| 6580593 | Method and apparatus for fault condition protection of a switched mode power supply Methods and apparatuses for fault condition protection of a switched mode power supply. In one aspect of the invention, a power supply circuit having an auto-restart function to turn the power supply on and off repeatedly under fault conditions is include... | 06/17/2003 |
| 6385022 | Method and apparatus for deriving power system data from configurable source points A protective relay that derives and processes power system data from multiple user-configurable data source points. Data from multiple source points can be combined in the relay as a single source of data useful to perform a wide variety of monitoring and... | 05/07/2002 |
| 6324041 | Protection circuit for traveling wave tubes having multiple input tones A protection circuit (30) for a Traveling Wave Tube having multiple tone operation. The protection circuit (30) is a dual sensor (52, 54) arrangement. One sensor (52) is an operational amplifier circuit (56) having a short time constant and a high thresho... | 11/27/2001 |
| 6297939 | Zone selective interlock for a circuit breaker system A circuit breaker system 10 using electronic trip units 35. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled, and/or monitored by a central computer 20. Further, the e... | 10/02/2001 |
| 6279115 | Circuit arrangement for monitoring of an electric tripping device for low-voltage switches A circuit arrangement is described for monitoring an electronic tripping device for low-voltage switches having a microprocessor device which, in conjunction with a digital-analog converter, evaluates an overcurrent so that line power supply system. The m... | 08/21/2001 |
| 6195243 | Method and apparatus for adaptive configuration and control in a network of electronic circuit breakers A system including a load center monitor (10) connected to a plurality of digitally enhanced circuit breakers (40) by a communication bus (26) forms a network of reconfigurable circuit breakers which provides advanced monitoring and control of an electric... | 02/27/2001 |
| 6175479 | Instantaneous protection device and method for a circuit breaker The present invention involves a power circuit breaker that conditionally and temporarily enables instantaneous trip protection. A position sensor senses whether the breaker contacts are open or closed. When the breaker contacts are open, the circuit brea... | 01/16/2001 |
