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| Number | Title | Issue Date |
| 8089792 | Cycloconverter generator In a cycloconverter generator, there are provided, q number of power circuits that supply rectified DC power of a DC power supply unit as operating power to the p(p>q) number of thyristors, and r(p>r) number of thyristor drive circuits that are connected to the q nu... | 01/03/2012 |
| 7262982 | Power conversion apparatus A power conversion apparatus is formed by connecting unit communication-assisting means in series between an alternating-current terminal incorporated in a conventional current-type power conversion apparatus, and an alternating-current load. The communication-assis... | 08/28/2007 |
| 7258575 | Light sense controller A light sense controller uses a light sensor to sense light variations, and then turns a socket on or off in response to the light levels for controlling household appliances coupled the socket. The light sense controller includes a plug and at least one socket. A s... | 08/21/2007 |
| 7200018 | Charging of a filter capacitor in the intermediate circuit of a frequency converter A method and an apparatus for charging a filtering capacitor in the direct-voltage intermediate circuit of a voltage-controlled PWM frequency converter comprising a rectifier (20) connected to an alternating-current source (UR, US, U | 04/03/2007 |
| 7176674 | Measurement of energy by means of a frequency converter A method and system for the measurement of energy in an alternating-current motor drive containing a frequency converter or an equivalent stepless rotational speed regulator provided with semiconductor switches. In this regulator, the power taken by the motor drive ... | 02/13/2007 |
| 7120003 | Circuit arrangement with power factor correction, as well as a corresponding appliance The circuit arrangement has a mains connection, a mains switch with two switching contacts, a demagnetization coil and a switch-mode power supply, which contains a driver circuit for producing a control voltage for the switching transistor of the switch-mode power s... | 10/10/2006 |
| 7112946 | Transformer with selectable input to output phase angle relationship A three-input induction transformer in which the phase relationship of the power output relative to the power input is selectable/adjustable after the transformer is placed in operation in the field. The transformer includes a primary set of windings and a three-pol... | 09/26/2006 |
| 7035124 | Damping system An active damping arrangement for a power conditioning circuit comprising a converter or an inverter and an electronically driven output line having an output terminal for connecting to an external load, the active damping arrangement comprising an inductor-capacito... | 04/25/2006 |
| 7029637 | Apparatus for ozone production, employing line and grooved electrodes An ozone generation cell has a first conductor generally having a line geometry and a second conductor having a first groove formed in a surface thereof, and having first and second flanks on opposite sides of the first groove. The second conductor and the first gro... | 04/18/2006 |
| 6989643 | Electrical drive apparatus which can be operated via a full-bridge circuit, with a different load depending on the drive direction An electrical drive apparatus, in particular, a motor-driven motor vehicle window winder or motor vehicle belt roller, which can be operated via a full bridge circuit with at least four switching elements with a different load depending on the rotation direction, wh... | 01/24/2006 |
| 6967520 | Gate drive circuit, which makes the gate-charge flow back to the load and the main power source A gate driving circuit having: a direct current power source; a driving signal source for outputting signal; a main switch device, having a gate terminal in which the signal outputted from the driving signal source is inputted, for controlling a conduction state bet... | 11/22/2005 |
| 6967415 | Power source apparatus A power source apparatus comprising: a direct current power source to output a first voltage; a load driven with a second voltage higher than the first voltage; a booster converter to boost an output from the direct current power source to the second voltage; and a ... | 11/22/2005 |
| 6822883 | Converter circuit arrangement, as well as a method for matching a variable DC voltage A converter circuit arrangement is disclosed for matching a variable DC voltage to a drive circuit for producing drive signals and having a three-point DC voltage intermediate circuit (2), which three-point DC voltage intermediate circuit (2) is formed... | 11/23/2004 |
| 6664750 | D.C. motor bridge coil driver An H-type motor bridge coil driver circuit is implemented with an electronic switch in each leg segment of an H-shaped circuit, this bridge circuit having its side legs each connected between a power supply and ground, with the inductive load of a motor c... | 12/16/2003 |
| 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 |
| 6462968 | Reverse conducting GCT (Gate Commutated Thyristor) and application of such a GCT A current source inverter (1) comprises a bridge circuit (2) having a plurality of bridge paths (5), in each of which a controllable power semiconductor component (6) is arranged. In the case of such an inverter, a loss in performance on account of induct... | 10/08/2002 |
| 6451267 | Device for powering an ozonizer The invention concerns a device for powering an ozonizer (7), characterized in that it includes a direct current power source (8), at the terminals of which are connected a dual series converter bridge coupled with a resonant charge consisting of a high v... | 09/17/2002 |
| 6188589 | Inverter An inverter having a large-capacity self-arc-extinguishing semiconductor element. Recovery capacitors recover energy stored in groups of elements for suppressing the rate of change in current, and are provided within a two-level or three-level inverter br... | 02/13/2001 |
| 6072707 | High voltage modular inverter A high voltage inverter cascades a plurality of multiple voltage level inverter modules each fed by an isolated dc energy unit to reduce the number of stages of the inverter required to generate a desired ac voltage. Thus, where the dc energy unit include... | 06/06/2000 |
| 6046920 | Power converter with improved control of its main switches, and application to a power converter having three or more voltage levels A power converter having two main switches connecting an outlet either to a positive rail or to a negative rail, two free-wheel diodes enabling the current through the load to be maintained, two snubber capacitors, and an auxiliary circuit. The auxiliary ... | 04/04/2000 |
| 6038157 | Fault tolerant power supply circuit A fault tolerant power supply circuit for a series resonant load having an inductive impedance. The power supply circuit includes alternately conducting first and second sets of switches for supplying current to the load in alternating directions. One ter... | 03/14/2000 |
| 6009009 | Low-inductance converter A converter is specified which is distinguished in that a bus system is provided between the paths of a phase module of the converter and allows potential chambers to be formed around the semiconductor switches and/or the circuitry elements. The potential... | 12/28/1999 |
| 5986906 | Converter circuit arrangement A converter circuit arrangement is specified. An extremely compact structure is achieved by virtue of the fact that the current rise limiting inductor concentrically surrounds the second stack containing diode and resistor. In particular, the inductor can... | 11/16/1999 |
| 5982646 | Voltage clamp snubbers for three level converter A three-level NPC converter includes at least one phase leg including four series coupled electrical switches having a first pair junction between the first two switches and a second pair junction between the second two switches. First and second inner sw... | 11/09/1999 |
| 5949669 | Low-loss power current inverter A low-loss power inverter is provided. Each inverter phase includes an upper and a lower bridge half, each having two power semiconductor switches, with antiparallel-connected diodes, with one tie point of the power semiconductor switches being connected ... | 09/07/1999 |
| 5949668 | Power amplifier with multiple switched output stages, and method and driver for operating same In a method for the drive of a number of coupled output stages drive signals for the output stages are generated. Given an over-voltage condition in one of the output stages, the output stage affected by the over-voltage condition is switched into a charg... | 09/07/1999 |
| 5943221 | Portable power unit A portable power unit is provided. A desired waveform signal indicative of a desired waveform having a desired frequency is generated. Switching control of a variable control bridge circuit is performed based on the desired waveform signal to cause the va... | 08/24/1999 |
| 5898585 | Apparatus and method for providing supplemental alternating current from a solar cell array A novel solar inverter circuit is used to connect a solar photovoltaic (PV) array with an alternating current (AC) voltage source to convert direct current (DC) power from the PV array to AC power. The solar inverter circuit employs the current-voltage (I... | 04/27/1999 |
| 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 |
| 5867376 | DC magnetization suppression in power converter transformers A power converting apparatus includes a power converter connected to a power line via a transformer 3, and current detectors 5A and 5B for detecting the currents of the windings of the transformer. The output signals of the current detectors 5A and 5B are... | 02/02/1999 |
| 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 |
| 5859769 | Piloting system for electric inverter The MOSFETs or IGBTs of respective arms of an electronic inverter are in series with SCRs or TRIACs triggered into conduction during intervals of intended conduction of the respective MOSFETs or IGBTs connected to the high level rectifier terminal. The pi... | 01/12/1999 |
| 5767653 | Variable speed AC induction motor controller A circuit for powering a two-phase AC induction motor. The circuit generates a first signal of the form Vdc+A sin(2πft-0°) and a second signal of the form Vdc+A sin(2πft-90°). The first signal is input to a first error amplifier along with a first sam... | 06/16/1998 |
| 5760495 | Inverter/charger circuit for uninterruptible power supplies A power supply for generating an uninterruptible AC power signal. The power supply utilizes leakage inductance in its transformer to eliminate the need for an output inductor. In standby mode, the AC power signal is generated from a battery by a switching... | 06/02/1998 |
| 5675482 | Accident detection circuit of a voltage-type self-excited power converter The accident detection circuit of the present invention is such that in a voltage-type self-excited power converter composed of anode reactors 13 and 23 connected in series, respectively, to power semiconductor elements 11 and 21 of self turn off type con... | 10/07/1997 |
| 5621257 | Gate drive circuit for voltage-driven type power switching device A gate drive circuit for a voltage-driven type power switching device, including a control device for generating a gate voltage for the voltage-driven type power switching device, and a correction device connected to the control device for receiving the g... | 04/15/1997 |
| 5592367 | Apparatus for non-contacting feeding of high frequency power The apparatus for non-contacting feeding of a high frequency power according to the present invention comprises a double voltage full-wave rectifier circuit which converts an AC input into a DC output, Royer oscillation circuit consisting of FETs and whic... | 01/07/1997 |
| 5523937 | Frequency converter, procedure for controlling it and motor control using a frequency converter A procedure and an apparatus for converting a first alternating voltage into a second alternating voltage with respect to frequency and amplitude by means of first (1) and second (2) bridges having switches (T1 . . . T12), and a reso... | 06/04/1996 |
| 5495404 | Multi-resonant inverter A multi-resonant circuit has a series-resonant circuit coupled to the input of an inverter. The output of the inverter is coupled to a parallel resonant circuit. The output of the parallel resonant circuit energizes a load, which could be gas discharge la... | 02/27/1996 |
| 5475582 | Stepless control of a load guided parallel resonant inverter A method for controlling current converter valves of a load-guided parallel oscillator inverter of an induction furnace includes supplying the inverter from a direct current source having positive and negative poles, and adjusting a current flow from the ... | 12/12/1995 |
