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| Number | Title | Issue Date |
| 7436686 | Reconfigurable voltage inverter with tolerance to failures Voltage inverter provided with four switching cells (Q1 to Q4) to be connected to the terminals of a DC voltage source (Vdc), each comprising two semiconductor switches (I11, I12, I21, I22, I31, I32, I41... | 10/14/2008 |
| 7388765 | Method and arrangement in connection with a half-controlled network bridge A method and an arrangement for controlling phase-specific thyristors of a half-controlled network bridge, the method comprising identifying a thyristor to be controlled on the basis of the magnitude of phase voltage, controlling the thyristor by switching on a volt... | 06/17/2008 |
| 7324314 | Disconnect switch with early break feature A disconnect switch that provides a simple and economical means for preventing the possibility of stray/surge current from damaging the solid state components of an inverter drive is provided. The disconnect switch includes early break auxiliary contact(s) that open... | 01/29/2008 |
| 7197360 | Methods and systems for using an inductor to increase capacitor reformation efficiency in an implantable cardiac device (ICD) Methods and systems for increasing capacitor reformation efficiency in an implantable cardiac device (ICD) are presented. In one embodiment, a method and system provide for: (1) fully charging a first capacitor, (2) transferring energy from the first capacitor to an... | 03/27/2007 |
| 7174591 | System for bridge-laying A system to lay a bridge between two banks, wherein said system firstly comprises a bridge carrying vehicle constituted by a remote-controlled self-propelled platform incorporating means to deploy and retract said bridge, said platform being unmanned and armor-free,... | 02/13/2007 |
| 7126833 | Auxiliary quasi-resonant dc tank electrical power converter An auxiliary quasi-resonant dc tank (AQRDCT) power converter with fast current charging, voltage balancing (or charging), and voltage clamping circuits is provided for achieving soft-switched power conversion. The present invention is an improvement of the invention... | 10/24/2006 |
| 7119497 | Dimmer for resistive or capacitive loads A power dimmer for an A.C. load comprising, between two terminals, two one-way switches connected in anti-parallel and controllable to be turned off and turned on, each switch being controlled by a driver circuit setting the turn-off times of each of the switches wi... | 10/10/2006 |
| 7072196 | Multi-stage high voltage solid state switch A method for triggering a high voltage solid state switch comprised of a set of thyristors connected in series. Initiating switch turn-on requires command triggering of only the lowest voltage thyristor, thereby eliminating the need for expensive high voltage pulse ... | 07/04/2006 |
| 6998735 | Controlled rectifier bridge, control system, and method for controlling rectifier bridge by disabling gate control signals A controlled rectifier bridge includes a plurality of segments each having an element responsive to a control signal, and an output having a voltage, a first current and a second current. Sensors provide sensed current values from first and second output currents fr... | 02/14/2006 |
| 6967559 | Transformer for high-voltage X-ray generator A power supply for a device which has a load, comprising a first resonant generator and a second resonant generator, coupled in parallel, each generator having a phase output. The power supply further comprises a control circuit coupled to the first and second gener... | 11/22/2005 |
| 6930897 | Fuel cell inverter The invention is directed to a method, system and device for converting direct current (DC) electrical voltage from a fuel cell to an alternating current (AC) voltage. The inventive method regulates power drawn from the fuel cell and from a battery to maintain a sub... | 08/16/2005 |
| 6930899 | N-point-converter circuit An n-point-converter circuit with two series-connected power converter valves, each having (n−1) turn-off semiconductor switches, is disclosed. The converter circuit has a voltage intermediate circuit with (n−1) electrically series-connected capacitors. The volt... | 08/16/2005 |
| 6882060 | Turbine generating apparatus A turbine generating apparatus includes a control unit which controls the turbine generating apparatus as follows. During a system connection running mode, a fuel is fed to the gas turbine at a fuel flow rate corresponding to a preset load. The converter prepares a ... | 04/19/2005 |
| 6791852 | Method for detecting and identifying shorted thyristors A method is provided for determining a shorted thyristor cell in a bridge that supplies a load from a source, the bridge including a plurality of the thyristor cells. The method includes the step of sequentially gating each of the cells to a conducting state, so tha... | 09/14/2004 |
| 6724313 | Fault detection system A fault detection system detecting malfunctions or deteriorations, which may result in an inverter fault, is provided. The system has a temperature sensor installed on a semiconductor module to monitor a temperature rise rate. It is judged that an abnormal condition... | 04/20/2004 |
| 6594130 | Method and circuit for the protection of a thyristor Circuits and methods for protecting thyristors in a bridge configuration are provided. A circuit comprises a line reactor in series with the input of the bridge and the input of the diametric cell, two leg reactors each in series with a respective leg and... | 07/15/2003 |
| 6563723 | Fault tolerant power supply circuit A fault current tolerant power supply circuit having a dc power source and switching devices for inverting dc current from the source into ac load current includes a protective circuit for protecting the switching devices from overvoltage conditions when ... | 05/13/2003 |
| 6442049 | Power conversion device with power source voltage drop detection unit In a power conversion device according to the present invention, an AC power source voltage signal Vac which is the instantaneous value of AC power source 1 detected by a power source voltage detection circuit comprising a transformer 5, rectifier 6 and A... | 08/27/2002 |
| 6404656 | Control equipment for thyristor-controlled series capacitor equipment, and a method for control thereof Thyristor-controlled series capacitor equipment (CEQ), intended for connection between an ac network (NET) and a converter (CONV), connected thereto, for conversion between alternating current ((IT) and high-voltage direct current (Id), with a controllabl... | 06/11/2002 |
| 6236576 | Method and a circuit for resonance inversion The invention related to a resonance inverter comprising a resonance circuit with at least one inductance and one capacitors, a switch circuit electrically connected to the resonance circuit comprising at least one power electronic component, as well as a... | 05/22/2001 |
| 6205039 | Device for supervising a high voltage converter station A device in a valve on high voltage potential level and in a high voltage converter station comprises members arranged on high voltage level and adapted to detect parameters of a voltage divider circuit consisting of resistances (24, 25) and capacitors (2... | 03/20/2001 |
| 6205040 | Auxiliary resonant commutated pole three-point or multipoint converter A three-point or multipoint converter is described. The converter has a series circuit formed of at least four main switches per converter phase, which are connected electrically in parallel between a positive and a negative DC voltage rail. An individual... | 03/20/2001 |
| 5892675 | AC current source circuit for converting DC voltage into AC current An AC current source circuit converts a DC input voltage into an AC output current, and comprises a chopper circuit for converting a DC input voltage into a chopper voltage; and an inverter for converting the chopper voltage into an output AC current of a... | 04/06/1999 |
| 5864475 | Power converter The power converter extracts the accumulated energy accumulated in a snubber capacitor (a first capacitor) from the second capacitor in a series circuit, composed of a second capacitor and a diode, which is provided in parallel with that snubber capacitor... | 01/26/1999 |
| 5844788 | Voltage oscillating circuit and method The present invention comprises a circuit for generating a large-amplitude oscillating voltage. The circuit includes a power supply means for providing an input voltage and a power supply switching means including a solid state relay (SSR) connected to th... | 12/01/1998 |
| 5798916 | High power inverter pole employing series connected devices configured for reduced stray loop inductance A high power inverter pole for a voltage sourced inverter suitable for providing compensation in electric power transmission and distribution systems, has a positive switching valve and a negative switching valve connected between closely spaced dc-source... | 08/25/1998 |
| 5796599 | Self-powered gate driver board A method and/or apparatus used with a thyristor based AC-AC motor controller in a discontinuous current mode for providing power to thyristor gate drivers. The apparatus includes a snubber network and two rechargeable capacitors for storing input line vol... | 08/18/1998 |
| 5731967 | Converter circuit arrangement with minimal snubber A converter circuit arrangement in which the gate turn-off thyristors are driven hard, i.e., the GTO is driven with a gate current configured in such a way that the turn-off gain IS/IGpeak is distinctly less than 3 so as to result in an anode voltage rise... | 03/24/1998 |
| 5729446 | Converter circuit arrangement with actively controllable current and voltage rise limiting means A converter circuit arrangement is specified in which actively controllable current and voltage rise limiting means are provided in parallel with a semiconductor switch. These means also take over the function of a reverse-connected parallel diode and ess... | 03/17/1998 |
| 5684465 | Method and means for supervision of valve units The invention relates to a method for supervising the functioning of a plurality of valve units, a system for performing the method, a control unit and a control assembly for cooperation with the control unit. Each valve unit in the system comprises a sem... | 11/04/1997 |
| 5579215 | Power conversion device with snubber energy regenerating circuit A power conversion device including a plurality of bridge connected self-turn-off modules. Each of the self-turn-off modules includes a plurality of self-turn-off devices connected in series and a plurality of first snubber circuits, each including a firs... | 11/26/1996 |
| 5483192 | Gate power supply circuit A gate power supply circuit including a switching device and a gate drive circuit connected to the switching device for generating a gate signal to be supplied to a gate of the switching device. The gate power supply circuit further includes a series circ... | 01/09/1996 |
| 5450308 | Gate power supply circuit A gate power supply circuit including a switching device and a gate drive circuit connected to the switching device for generating a gate signal to be supplied to a gate of the switching device. The gate power supply circuit further includes a first serie... | 09/12/1995 |
| 5434772 | Control device for thyristor converter A device for controlling a thyristor converter including series connected thyristors. The device includes a plurality of forward voltage detection circuits, each of which detects forward voltage of one of the thyristors and generates a forward voltage sig... | 07/18/1995 |
| 5418706 | Wide load matching capability power supply A high frequency power inverter comprises a power supply, a thyristor for switching the energy from the power supply to a load and a neutral capacitor for storing energy cyclically to assure reverse voltage is applied to the thyristor. A clamp circuit is ... | 05/23/1995 |
| 5297014 | Switching DC power supply apparatus A DC power supply apparatus includes a switching transformer having a switching element, a primary current detection circuit, arranged on a primary side of the transformer, for detecting a current flowing in the switching element, a secondary current dete... | 03/22/1994 |
| 5291387 | Switching voltage regulator with protective device against thermal breakdown A switching-type voltage regulator of this invention comprises a voltage control section for generating a stabilized voltage by controlling a voltage supply period from input side to output side, and a protective device. The protective device monitors the... | 03/01/1994 |
| 5262691 | Gate turnoff thyristor control circuit with shorted gate detection For responding to a shorted gate in a gate turnoff thyristor the gate electrode of which is connected by means of a controllable switch to a control voltage terminal having a negative potential with respect to the cathode potential of the thyristor, the c... | 11/16/1993 |
| 5260863 | Control of a discontinuous current by a thyristor rectifier with inductive load For controlling the current in an inductive load, the gate current used to fire thyristors in a rectifier is controlled to reach zero at exactly the same time, within a given half-wave, as the current in the inductive load which receives the voltage from ... | 11/09/1993 |
| 5208495 | Static power switch incorporating semi-conductor A static switch is disclosed, adapted to switch overintensities of more than a thousand amps. Instead of using one large, commercially available component, a series of small components are used in parallel, each being associated with a snubber circuit.... | 05/04/1993 |
