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| Number | Title | Issue Date |
| 8139326 | Unit with built-in control circuit with protect elements The present invention provides a unit with a built-in control circuit capable of cost reduction. The unit of the present invention is an unit with built-in control circuit comprising a ground line, a control circuit including a plurality of terminals to be connected... | 03/20/2012 |
| 7443640 | Apparatus for detecting arc fault Disclosed herein is an apparatus for detecting an arc fault, which prevents a malfunction caused by a conventional current detecting method by detecting a source voltage applied onto a conductive wire to determine whether there is an arc fault, prevents a malfunctio... | 10/28/2008 |
| 7440245 | Arc fault circuit interrupter and method of detecting an arc fault An arc fault circuit interrupter includes separable contacts, an operating mechanism adapted to open and close the separable contacts, and a trip mechanism cooperating with the operating mechanism to trip open the separable contacts. The trip mechanism includes a pe... | 10/21/2008 |
| 7433170 | Apparatus and method of controlling the closing action of a contactor A contactor having a separable conduction path, an actuator, a magnetic stator and armature, and a controller, is disclosed. The actuator is in mechanical communication with the separable conduction path, and the magnetic stator and magnetic armature are arranged in... | 10/07/2008 |
| 7405910 | Multifunction hybrid solid-state switchgear A universal hybrid solid-state switchgear for power transmission or distribution systems incorporates a fast mechanical switch and solid-state power electronics switching circuits to provide circuit breaker and fault current limiting applications. ... | 07/29/2008 |
| 7400481 | Low cost arc fault detection technique Low cost apparatus and methods of detecting arc faults for better discriminating electrical events. The arc fault detection apparatus includes a current sensor, a di/dt input sense circuit, a dv/dt input sense circuit, and a processing unit. The current sensor monit... | 07/15/2008 |
| 7259950 | Load-protection control circuit of power supply A load-protection control circuit of a power supply, which applies to the power supply that has a maximum power-limiting function. The power supply includes a power transformation circuit which outputs a direct current to drive loads and a control circuit which can ... | 08/21/2007 |
| 7256977 | Device for protection from thunder This invention aims at preventing a thunderbolt attack detecting circuit from determining that no thunderbolt is approaching because the thunderbolt attack detecting circuit turns to its initial condition due to power interruption caused by an approaching thunderbol... | 08/14/2007 |
| 7224287 | Method for determining the switching state of a contact and evaluation circuit corresponding thereto An input voltage contacted at the input of a contact can be through-connected to an output of the contact or switched off via a movable contactor. In order to determine the switching state of the contact, any drop in the contact voltage between the input and the out... | 05/29/2007 |
| 7161775 | Arc fault circuit breaker and apparatus for detecting wet track arc fault An apparatus includes a first circuit detecting when an absolute value of a current signal is less than a first predetermined value and outputting a signal after a first time period. A comparator compares that signal to an envelope of a rectified current signal, in ... | 01/09/2007 |
| 7159134 | Method and apparatus for clock and power control in wireless systems A digital baseband processor is provided which receives a system clock generated by a system oscillator and generates a plurality of clock signals from the system clock. The digital baseband processor includes a digital signal processor for executing digital signal ... | 01/02/2007 |
| 7149065 | Self testing digital fault interrupter A fault interrupter apparatus having a line side and a load side and a conductive path there between. The apparatus includes a solenoid that is adapted to move a plurality of contacts disposed in the conductive path from a first position to a second position, an ala... | 12/12/2006 |
| 7079363 | Hybrid DC electromagnetic contactor In a hybrid DC electromagnetic contactor, by including a power unit for supplying a certain power voltage; a main contact point of a breaking switch for providing a supply path of the power voltage by being switched in accordance with a voltage apply to an operation... | 07/18/2006 |
| 7012793 | Power converter with polarity reversal and inrush current protection circuit A power converter for converting an input power into a desired output power adapted to a power-receiving device. The power converter includes a polarity reversal protection circuit preferably constructed with a schottky diode that is used to ensure the correct conne... | 03/14/2006 |
| 6987671 | Composite thermal interface devices and methods for integrated circuit heat transfer A method and device for thermal conduction is provided. A thermal interface device and method of formation is described that includes advantages such as improved interfacial strength, and improved interfacial contact. Thermal interface devices are shown that include... | 01/17/2006 |
| 6956725 | Current controlled contact arc suppressor The arc suppression system for electrical contacts includes a transistor, such as an IGBT, which is connected across the contacts. A control circuit controls the operation of the transistor such that the turning on of the transistor results in a current path around ... | 10/18/2005 |
| 6943558 | System and method for remotely detecting electric arc events in a power system A system is provided for remotely detecting and locating damaged conductors. The system includes at least one slave controller disposed proximate at least one load and electrically connected to the loads via at least one conductor. The slave controller includes at l... | 09/13/2005 |
| 6917500 | Hybrid relay including solid-state output and having non-volatile state-retention and associated methods The hybrid relay may include a plurality of input and output terminals, and a voltage supply terminal. The hybrid relay may also include an electromagnetic coil connected to the input terminals and a latching mechanism that may include first and second contacts mova... | 07/12/2005 |
| 6801009 | Current limitation process of brush and brushless DC motors during severe voltage changes A closed-loop control system for a DC motor includes a DC motor 12, a current sensor 14 for determining a current of the motor, a voltage sensor 32 for measuring a voltage of the motor 12, and a micro-controller 33. The micro-contr... | 10/05/2004 |
| 6744229 | Safety-guard detective circuit of a fan motor A safety-guard detective circuit of a fan motor includes a resistor being adapted to limit a large current input into the motor driver circuit, and a discharge member being adapted to perform grounding to discharge the large current limited by the resistor. The resi... | 06/01/2004 |
| 6693777 | Method for controlling the operation of a switching device A method for controlling the closing operation of a switching device, which is disposed on an electrical network connected to an inductive component. The method requires first data related to the electrical characteristics of the inductive component and t... | 02/17/2004 |
| 6594125 | Vehicle electrical system arc detection apparatus and method Disclosed is a vehicle which includes an electrical system monitoring system which results in detecting arcing in the electrical distribution system of the vehicle and the ability to provide notification and protection for such arcing. The system function... | 07/15/2003 |
| 6424097 | Projection lamp safety interlock apparatus and method A safety interlock apparatus for an electrical device includes a DC power supply, a ballast power supply including a ballast control circuit that controls a ballast power circuit, and a lamp. A relatively low voltage electrical connection is present betwe... | 07/23/2002 |
| 6421214 | Arc fault or ground fault detector with self-test feature A self-testing arc fault or ground fault detector includes arc fault detecting circuitry and components. The detector includes a testing circuit which tests at least part of the circuitry and components and generates a recurring signal when the test compl... | 07/16/2002 |
| 6336083 | Method and apparatus for predicting heater failure A method is shown of predicting failure of resistive element heaters using a compiled database of measured ratiometric factors affecting heater life. The method can either be carried out actively, by continuously measuring known factors affecting heater l... | 01/01/2002 |
| 6313641 | Method and system for detecting arcing faults and testing such system A system for detecting arcing faults in an electrical distribution network having a line conductor carrying an electrical signal between a power source and a load, the system being capable of detecting series arcs, line-to-neutral arcs and line-to-ground ... | 11/06/2001 |
| 6151560 | Open circuit failure monitoring apparatus for controlled electrical resistance heaters An open circuit failure monitoring apparatus for controlled electrical resistance heaters is disclosed. The heater failure monitoring apparatus allows controlled electrical resistance heaters to be continuously monitored for open circuit failures without ... | 11/21/2000 |
| 6104583 | Overcurrent protection systems An overcurrent protection system containing (1) a current sensing means; (2) a first switch coupled to the current sensing means; (3) a voltage sensing means; (4) a PTC device; and (5) a second switch coupled to the voltage sensing means. In one type of s... | 08/15/2000 |
| 5875102 | Eclipse via in pad structure A ball grid array (BGA) integrated circuit package which has a plurality of vias connected to a plurality of solder pads located on a bottom surface of a package substrate. Each via has a portion located within a solder pad to increase the routing space o... | 02/23/1999 |
| 5831803 | Overcurrent protection circuit A circuit protection system employing arrangements of PTC devices and mechanical switches. The PTC device is not involved in the circuit until a fault is sensed. A current sensing relay senses an overcurrent and directs the current to the PTC device. As t... | 11/03/1998 |
| 5737161 | Overcurrent protection device and arrangement Overcurrent protection arrangements including a relay comprising two coils wound on a common magnetic core and a PTC device coupled in parallel with the relay contacts. The arrangement comprises a circuit interruption element which has a normal state whic... | 04/07/1998 |
| 5684466 | Electrical strike system control for subsurface boring equipment An electrical strike sensing system for providing an alarm if the underground boring equipment encounters a potentially hazardous condition. The system senses current carried through the equipment, as well as the voltage between the equipment and a refere... | 11/04/1997 |
| 5644463 | Adaptive sequential controller with minimum switching energy An adaptive sequential controller (480) for controlling a single-phase circuit breaker, multiple circuit breakers in a multi-phase configuration, or a multi-phase circuit breaker to substantially eliminate transients upon closing the circuit breaker and t... | 07/01/1997 |
| 5627415 | System and method for opening/closing circuit breakers The first zero crossing of the power signal, after the detection of an opening/closing signal, initiates a series of predetermined, timed, steps which reduces or eliminates the overvoltage after opening/closing a circuit breaker on a high power line.... | 05/06/1997 |
| 5608598 | Effector with self-compensated contacts for power supply of a receiver circuit The present invention relates to an effector comprising power contacts for power supply of a receiver. The effector comprises an operating mechanism for the power contacts, this mechanism being actuated by an electromagnet. Between a power circuit for sup... | 03/04/1997 |
| 5513061 | Apparatus and method for distributing electrical power The present invention relates to an apparatus and method for distributing electrical power from power substation circuits. The apparatus of the present invention is responsive to overcurrent conditions and selectively actuates a switching network so as to... | 04/30/1996 |
| 5388022 | Auto reset circuit breaker The specification discloses a solid state auto-reset circuit breaker intended for use in ac circuits, dc circuits and ac/dc circuits. A current sensing device is used to generate a voltage drop proportional to the current flowing through the device. When ... | 02/07/1995 |
| 5359486 | Method and circuit for synchronization of relay operation A control circuit synchronizes operation of a latching relay to extend contact life. The relay is switched using an H-bridge drive circuit. The synchronization is done using a two-step delay. The first delay is provided by a phase shifter, which delays th... | 10/25/1994 |
| 5103365 | Downed conductor automatic detecting device A device for detecting and isolating a downed conductor in a three-phase four-wire multi-grounded distribution system. The device cooperates with a power supply protective device if the device has a breaking capacity less than the maximum prospective shor... | 04/07/1992 |
| 5055962 | Relay actuation circuitry The operation of an electromechanical relay is synchronized with the power line waveform where an electrical power supply is supplied from a source to an electrical load. The current voltage supplied to the load is characterized by a power line waveform. ... | 10/08/1991 |
