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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,...
7830642 Disc apparatus  
A disc apparatus which can judge accurately whether or not a spindle motor is at fault due to a short circuit is provided. A disc apparatus (1) includes a spindle motor (3) which rotates a disc...
7747879 Power distribution system using solid state power controllers  
Solid state power controllers are described that include a switch controlled by a microcontroller and communication contacts. In one aspect of the invention, the microcontroller is galvanically...
7746605 Arc fault circuit interrupter and method of detecting and interrupting a resistive series arc of a power circuit  
An arc fault circuit interrupter includes line and load terminals, separable contacts in series between the terminals, a neutral conductor, and an operating mechanism opening and closing the...
7660083 Electromechanical and solid-state AC relay with reduced arcing  
An electromechanical/solid-state AC relay has an electromechanical winding coil that moves an armature to force mechanical contacts to open or close. Electrical arcing across the mechanical...
7626286 Method for mains-synchronous switching of circuit breakers, and an apparatus for carrying out this method  
The method for mains-synchronous switching of circuit breakers comprises the following method steps: measurement of the current flowing through a circuit breaker (9) and measurement of a mains...
7593198 Relay circuit  
A switching circuit for connecting a power source to a load is described. The circuit comprises a first relay and at least one second relay in parallel arrangement with the first relay. The...
7531983 Method of controlling startup current of motor and disk drive using the method  
Provided is a method and apparatus for controlling a motor of a disk drive. The method is used to stably control the startup current of a motor by considering a voltage drop and the disk drive uses...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
5051859 Current-limiting load cutout  
A current-limiting load cutout includes at least one contact pair (1, 2) with one contact (3, 5) rigidly linked to electrodynamic current limiter (9, 10) that is electrically connected to...
4767944 Hybrid relay circuit having electromagnetic relay for switching AC power supply  
In a hybrid relay circuit for supplying current to a load with a AC power supply, an electromagnetic relay is provided and the contact thereof is connected in series to the load and the AC power....
4760483 Method for arc suppression in relay contacts  
In a circuit having an electro-mechanical relay, the contacts of which are subject to arcing, bridging across the electro-mechanical relay in a manner configured to begin conducting electrical...
4709296 Protection arrangement for a telephone subscriber line interface circuit  
The contacts of an isolation relay are positioned between a line interface circuit and the associated feed resistors, the relay being controlled to open the contacts in response to an excessive...
4670810 Zero-current a.c. switching system  
A zero-current a.c. switching system is provided for controlling actuation of relay contacts between a power supply and a load. A primary switch selectively energizes the relay to maintain the...
4628393 Method for switching in a three-phase high voltage circuit  
A method for interrupting an inductive load in a three-phase, high voltage network by means of a switch having a quick dielectric recovery, in particular a vacuum switch, in which two of the three...
4578730 High-voltage DC circuit breaker apparatus  
There is disclosed a high-voltage DC circuit breaker apparatus with reverse current insertion system by line voltage charge, which comprises a commutation switch, a series circuit of a capacitor, a...
4544978 Circuit for the arcless de-energization of a direct current load  
A circuit for the arcless de-energization of a direct current load receiving direct current from a rectified alternating current source. The circuit includes a means for rectifying alternating...
4536814 D. C. power controller with fuse protection  
A D.C. power controller for interrupting a high voltage high current D.C. power line supplying a load (L) from a D.C. power supply source (+270VDC) having power contacts (CCC, AC), actuator means...
4485422 Secondary arc extinction device  
A secondary arc extinction device in an electric power system, including a bus bar; an electric power line connected to the bus bar; protective relaying means connected to the bus bar; first...
4462057 A.C. Switching circuit  
A.C. switching circuit capable of opening and closing contacts without generating any arc. When D.C. source restores from its interruption, the contacts are maintained in or shifted to a...
4420784 Hybrid D.C. power controller  
A hybrid D.C. power controller of the relay/circuit breaker type that uses a hybrid arrangement of hard contacts (4) and power FET's (18, 20) in cooperative functional combination as the arc...
4389691 Solid state arc suppression device  
An arc suppression device (40) for protecting the load carrying contacts (30, 31, 32) of a power contactor (20) includes gate controlled semiconductor devices (TR1, TR2, TR3) connected in parallel...
4068273 Hybrid power switch  
A hybrid AC power switching arrangement in which two ganged switch banks in series are employed along with a pair of reverse parallel (back-to-back) SCRs across each contact pair of the second...
Matches 1 - 50 out of 61 1 2 >