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| Number | Title | Issue Date |
| 8120210 | Method and device for line-switching of MEMS matrix and AMDF Embodiments of the present invention provide a method and a device for line-switching in an automated main distribution frame (AMDF) which may solve the problem of contact point damage which may occur during hot switching of micro electromechanical system (MEMS) mat... | 02/21/2012 |
| 7449801 | Semiconductor circuit arrangement for controlling a high voltage or a current of high current intensity In the case of a semiconductor circuit arrangement for controlling a high voltage with a series circuit of semiconductor modules, the high voltage possibly being dropped between the ends of the series circuit, increased functional reliability is achieved by each sem... | 11/11/2008 |
| 7414335 | Inrush current controller An inrush current controller for a device has a connector for hot-plugging the device into a source of energization. An impedance has a current input coupled to a first contact of the connector and a current output coupled to the device. The impedance has an impedan... | 08/19/2008 |
| 7361860 | Integrated touch sensor and light apparatus A touch sensor is physically integrated with a light emitting device to provide a switching device with built-in backlighting. In some embodiments, the touch sensor and the light emitting device share electrical components. ... | 04/22/2008 |
| 7317264 | Method and apparatus to independently control contactors in a multiple contactor configuration A method and apparatus to independently control the closing or making of contactors in a modular contactor assembly is disclosed. The apparatus includes a contactor assembly having multiple contactors such that each contactor is separately controlled such that one c... | 01/08/2008 |
| RE39855 | Power management strategy to support hot swapping of system blades during run time A hot swappable system is described. It included software controlled hot swapping operations which provided a graceful booting or power-down of the system. In the even of force insertion or extraction of the system blades, a set of hardware features (such as using d... | 09/25/2007 |
| 7224557 | Method and system of controlling asynchronous contactors for a multi-phase electric load Control of an induction motor is carried out to limit damaging arcing stress and mechanical stresses placed on the control contactor assembly and the induction motor resulting from the simultaneous or synchronous breaking and making of contactors employed to connect... | 05/29/2007 |
| 7196434 | Modular contactor assembly having independently controllable contractors The present invention provides an electrical isolation apparatus having independently controllable contactors. The isolation apparatus includes a contactor for each phase or pole of an electrical device as well as each phase or pole of a load. Each contactor is cons... | 03/27/2007 |
| 7123829 | Digital camera and power supply apparatus used therefor A digital camera, including a common power supply for supplying power; a plurality of motors sharing the power supply and driven by the power supplied from the power supply; and a current detector for detecting load current supplied to the plurality of motors, where... | 10/17/2006 |
| 7102540 | Remote access of an airport airfield lighting system Remote monitor and control of an airfield lighting system. A processing system local to the airport is provided in communication with the airfield lighting system for monitor and control thereof, the airfield lighting system producing airfield information for proces... | 09/05/2006 |
| 7057311 | Isolation contactor assembly having independently controllable contactors The present invention provides an electrical isolation apparatus having independently controllable contactors. The isolation apparatus includes a contactor for each phase or pole of an electrical device as well as each phase or pole of a load. Each contactor is cons... | 06/06/2006 |
| 6995482 | Switching circuit and method therefor A method for providing a current path during switching transitions of a switching circuit while limiting the short circuit current. In one embodiment, a switching circuit includes a passive break-before-make element in series with two switches. An alternate embodime... | 02/07/2006 |
| 6956728 | Method and apparatus to control modular asynchronous contactors A modular asynchronous contactor assembly includes a contactor for each phase or pole of an electrical device. The contactor assembly is applicable as both a switching device and an isolation or load protection device. As such, each contactor is constructed so that ... | 10/18/2005 |
| 6528904 | Power management strategy to support hot swapping of system blades during run time A hot swappable system is described. It included software controlled hot swapping operations which provided a graceful booting or power-down of the system. In the even of force insertion or extraction of the system blades, a set of hardware features (such... | 03/04/2003 |
| 6310410 | Method and apparatus for reducing source voltage deviation in hot plug applications A hot swappable system includes a first system having an electrically conductive projection and a second system. The second system includes a voltage source having a first node having a first polarity, a resistive element, and a receptor system associated... | 10/30/2001 |
| 6218652 | Apparatus for eliminating inrush current of a microwave oven In the microwave oven having a high voltage driving part with a high voltage transformer, a switching unit applies electric power to the high voltage driving part. In the switching unit, when switched on, an operational contact firstly comes in contact wi... | 04/17/2001 |
| 6034445 | Power source transfer lockout circuit Electrical loads are powered by one of several different power sources through a selector switch. A monitoring circuit monitors the different power sources to sense a change of state, that is, power up or shut down. Such a change indicates that the select... | 03/07/2000 |
| 5783876 | Switch with controlled rise and fall characteristics A switch having controlled rise and fall characteristics for electronic switching and power controlling a load has a switching element for the load controlled by a rectifier bridge, a filter circuit, a feedback amplifier stage, a low-power switch (SCR) an... | 07/21/1998 |
| 5679986 | Synchronization of switchgear switching to waveform indices There is described method and apparatus to obtain synchronized switching of switchgear. A superposition of forces is used wherein the moving contacts of switchgear driven by a conventional operating mechanism has a secondary force, either opposing or aidi... | 10/21/1997 |
| 5610453 | Pulsewidth modulation (PWM) frequency slider A frequency slider circuit for reducing power dissipation in the form of switching losses in a switching device when the switching device is near its desired maximum temperature limit is disclosed herein. The switching device controls an electric load, su... | 03/11/1997 |
| 5519264 | Inrush current limiter A method and apparatus for preventing current inrush upon the application of power to a load includes the steps of applying a first increasing DC voltage from a voltage source to the load through a negative temperature coefficient device having a first te... | 05/21/1996 |
| 5099187 | Power connect safety and connection interlock A power connect safety and connection interlock system is shown for use with inverters and other DC loads (16) which include capacitor filter banks (14) at their DC inputs. A safety circuit (20) operates a spring (26) biased, solenoid (22) driven mechanic... | 03/24/1992 |
| 5041775 | Speed control for multitap induction motor A control circuit for controlling the speed of a tapped winding motor that includes a set of motor speed selection relays, and a normally open relay connected in series with the set of motor speed selection relays. The motor speed selection relays are con... | 08/20/1991 |
| 5030844 | DC power switch with inrush prevention A DC power switch (10) for a capacitive load (11) has a main transistor (Q1) in series with the load between positive and negative DC bus terminals (B+, B-). A secondary transistor (Q2) and a resistor (R1) are connected in... | 07/09/1991 |
| 4897557 | Electronic control system, in particular for a printer Such electronic control systems contain safety circuits for device components endangered by excessive currents or excessive voltages, which are constructed only for a pulse operation and not for higher relative switch-on times. In order to shield the effe... | 01/30/1990 |
| 4864157 | Reduced arcing contact switching circuit A reduced arcing contact switching circuit. It is desirable to control the switching of electrical contacts so that opening and closing occur at the time when zero power is being transferred to the load so as to substantially reduce arcing at the contacts... | 09/05/1989 |
| 4829457 | Overload protection circuit for solid state switch A control device for energization of a load employs a bidirection triggerable solid state switching device connected in series with an alternating current power source and the load. In order to prevent the passage of excessive, potentially destructive cur... | 05/09/1989 |
| 4780622 | Apparatus for reducing stresses that initiate restrike of breakers in disconnecting capacitor banks Re-strike in the circuit breaker of a capacitive load applied across an AC voltage power supply is reduced or avoided by connecting across the capacitor bank a tuned discharge circuit. The tuned discharge circuit includes a transformer with a primary conn... | 10/25/1988 |
| 4772809 | Switching circuit and a relay device employed to prevent arcing A switching circuit for supplying electric power to a load from a power source includes a first relay device having a first switch and a semiconductor switching element connected in series with the first switch, power source and load. A second relay devic... | 09/20/1988 |
| 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 current around the electro-mechanical relay prior to closing t... | 07/26/1988 |
| 4748343 | Electromagnetic contactor with universal control An electrical motor contactor or controller is taught in which control signals from remotely located pushbuttons are supplied to the logic portion of the controller for the purpose of initiating or stopping a predetermined contactor or controller actions.... | 05/31/1988 |
| 4617496 | Warm-up circuit with timed shut-off of the warm-up current A switch circuit is disclosed which warms-up a load prior to complete turn on. The circuit includes a single pole double throw switch and an amplifier. The input to the amplifier connects to the off throw of the switch and the amplifier is rendered noncon... | 10/14/1986 |
| 4520416 | Shunt-foldback voltage source A foldback power supply (12) is used in an automatic testing device for application of power to a device under test (17). Connection to the device under test is made by means of relay contacts (32, 34, 36, and 38). Arcing and unacceptable transients are a... | 05/28/1985 |
| 4463400 | DC Static switch with phase commutation An apparatus for the interruption of DC transmission lines without substantial arcing utilizing in combination a DC circuit breaker, a DC-to-AC current converter, converter control and an AC power sink. Upon command from the converter control, DC current ... | 07/31/1984 |
| 4437020 | Electromagnetic switchgear An electromagnetic switchgear has a set of main and leading switches in a housing for adding series damping resistors to legs of a network which feeds a capacitive load. Plural switch sets are arranged side by side with associated main and leading switche... | 03/13/1984 |
| 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 with the contacts. A signal from a control circuit (45) ca... | 06/21/1983 |
| 4355239 | Electrical power supply arrangement An electrical power supply arrangement comprises an electrical generator having a field winding and supplying current through a switching device to external loads. The switching device is responsive to sequential switching signals from a control circuit, ... | 10/19/1982 |
| 4323748 | Power transfer system Disclosed is a method of transferring energy from a stationary generator of power at radio frequencies to a rotating work station such as a coil to heat inductively by selectively connecting the generator as the work station rotates past the generator. A ... | 04/06/1982 |
| 4321447 | Energization circuit for a microwave oven An energization circuit for a microwave oven employs a PTC thermistor to eliminate high transient current surges resulting from energization and deenergization of induction elements therein to provide circuit protection both during oven start and operatio... | 03/23/1982 |
| 4313063 | Airport lighting sequence control An airport lighting system is provided with a plurality of groups of lights, each light group being assigned to a specific taxiway. The system further includes a selector switch to control a plurality of relay circuits for selecting and reselecting the li... | 01/26/1982 |
