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| Number | Title | Issue Date |
| 7932640 | High voltage power supply A high voltage power supply (HVPS) including first and second high voltage output controllers controlling output of a high voltage output signal; and a plurality of transformers transforming an output signal provided from the first and second high voltage output con... | 04/26/2011 |
| 7471014 | Method and apparatus distributing power to a load in a powered device A powered device, such as an IP telephone, includes power converter electronics that allows the powered device to couple to multiple power sources and receive a relatively large amount of power (e.g., 15 W or greater) from any single power source or from any combina... | 12/30/2008 |
| 7425780 | Safety interface system A symmetrical power system is provided that supplies a symmetrical power at an output power supply. The symmetrical power system comprises a first transformer and a second transformer which have identical transformer properties. The first and second transformers are... | 09/16/2008 |
| 7385314 | Power supply having power saving mode A removably connected power supply for supplying external power to an electronic product. An output unit supplies power to the electronic product. A switching unit selects whether to supply the power to the output unit, and a switching apparatus turns on the switchi... | 06/10/2008 |
| 7365451 | Power converter A power converter that can continue to operate after suffering a partial failure. The power converter includes multiple array transformers; normally-on switches connected respectively in series with the ends of each of the primary windings of the array transformers;... | 04/29/2008 |
| 7307361 | Medium voltage power converter formed using low voltage drives A medium voltage power converter is provided that has an input transformer adapted to connect to a multi-phase power source, multiple low voltage drives each coupled to a respective set of secondary windings of the input transformer and operatively configured to pro... | 12/11/2007 |
| 7166933 | Submarine power feeding branching device for submarine power feeding system having submarine feeding cables arranged in mesh pattern A submarine power feeding branching device comprises a constant current-constant current converter which isolates an input side for a trunk submarine cable from an output side for a branch submarine cable. The converter receives a first constant current and produces... | 01/23/2007 |
| 7142082 | Electromagnetic device and high-voltage generating device and method of producing electromagnetic device An electromagnetic device and a high-voltage generating device which are thin with improved characteristics includes a magnetic core of a cylindrical form of a ferrite material having a high intrinsic resistance. A winding is provided by winding a flat rectangular w... | 11/28/2006 |
| 7138731 | Switching converter having a controllable load element Switching converter to convert an input direct current (UE) into at least one output direct current (UA), wherein an internal auxiliary voltage (UH1, UH2) is derived from at least one auxiliary winding (WH1, W | 11/21/2006 |
| 7122917 | Control arrangement and isolated power supplies for power electronic system A control method and arrangement is provided that monitors the condition and operating parameters of a power electronic system having power electronic devices to optimize operation of the power electronic system. Further, electrically isolated power supplies to indi... | 10/17/2006 |
| 7088073 | Inverter drive system Systems and methods are provided for dynamically changing configurations of multi-inverter drive systems. By changing configurations during operation, a multi-inverter system of the present invention can provide greater than half of full output power during failure ... | 08/08/2006 |
| 7071582 | Output rising slope control technique for power converter An output voltage rising slope control technique for a power converter is addressed. The output voltage rising slope control technique according to the present invention basically uses a reference voltage generator to precipitate the rising slopes of multiple output... | 07/04/2006 |
| 7053503 | Cross current compensation control system for a power system Across current compensation control system includes a cross current detection compensator having an input terminal to which a cross connection line that cross-connects the secondary sides of auxiliary current transformers (CTs) are connected, and an output terminal ... | 05/30/2006 |
| 7026727 | Power supply with multiple transformer current sharing Devices and methods for using multiple transformers to provide a power supply to a device or system. Included are systems for using multiple transformers and multiple fuses or circuit breakers to provide a power supply. In one embodiment two transformers and two fus... | 04/11/2006 |
| 7026905 | Magnetically controlled inductive device A controllable inductor, comprising first and second coaxial and concentric pipe elements, where said elements are connected to one another at both ends by means of magnetic end couplers, a first winding wound around both said elements, and a second winding wound ar... | 04/11/2006 |
| 6987331 | Voltage recovery device for use with a utility power network A voltage recovery device is configured to provide reactive power to a utility power network at a level and for a duration sufficient to recover the voltage on the utility power network within a predetermined proportion of the nominal voltage, following a fault cond... | 01/17/2006 |
| 6979916 | Step wave power converter A single- or multi-phase step wave power converter includes multiple transformers configured to receive DC voltage from one or more power sources. Each of the transformers includes a primary winding and a secondary winding. The transformers are each configured to su... | 12/27/2005 |
| 6946946 | Toroidal inductive devices and methods of making the same An inductive device comprises an electric winding component having a generally toroidal shape, and a plurality of discrete magnetic components at least partially embracing the electric winding component so as to complete a magnetic flux path and to form at least one... | 09/20/2005 |
| 6906433 | Method and apparatus for regulating the efficiency of a power supply in a computer system A computer system having multiple components capable of being in either a wake or sleep state includes a power manager and a voltage regulator. The power manager may generate a power state status signal indicating the power states of the components, and this signal ... | 06/14/2005 |
| 6833635 | Dual input DC-to-DC power converter A dual input power converter. The dual input power converter includes a transformer, a first primary circuit, and a second primary circuit. The transformer includes a first primary winding and a second primary winding. The first primary circuit is for coupling a fir... | 12/21/2004 |
| 6608404 | Step wave power converter A single- or multi-phase step wave power converter includes multiple transformers configured to receive DC voltage from one or more power sources. Each of the transformers includes a primary winding and a secondary winding. The transformers are each confi... | 08/19/2003 |
| 6552447 | Power supplying apparatus, image forming apparatus and method of controlling the same A power supply circuit providing voltage for operation, a motor operating powered by the output from this power supply circuit and continuing rotation powered by inertia even after loss of the output and a non-volatile memory are equipped. If the output v... | 04/22/2003 |
| 6483203 | Single unit integrated transformer assembly A transformer unit includes a first isolation transformer, a second isolation transformer and a power transformer. A single package incorporates the first isolation transformer, the second isolation transformer and the power transformer. A plurality of co... | 11/19/2002 |
| 6483205 | Distributed transformer control An improved circuit and device uses a set of eight switches, four of which are connected to the positive terminal, and four of which are connected to the negative terminal of a high voltage direct current power supply. The eight switches are attached in a... | 11/19/2002 |
| 6466627 | Pulse signal transmitting circuit and subscriber's line terminal apparatus using the pulse signal transmitting circuit A pulse signal transmitting circuit generates a pulse signal having an enhanced high-frequency component with a reduced power loss. A pulse signal is transmitted to a load circuit through a transmission cable connected to a secondary winding of a transfor... | 10/15/2002 |
| 6340851 | Modular transformer arrangement for use with multi-level power converter A modular transformer arrangement providing power to a multi-level power converter includes a plurality of three phase transformers having delta or extended delta connected primary windings and delta or extended delta or wye or zig zag wye connected secon... | 01/22/2002 |
| 6198178 | Step wave power converter A single- or multi-phase step wave power converter includes multiple transformers configured to receive DC voltage from one or more power sources. Each of the transformers includes a primary winding and a secondary winding. The transformers are each confi... | 03/06/2001 |
| 6194795 | Transformer configuration In a transformer configuration for controlling the energy flow in electrical transmission lines, an auxiliary transformer is provided. The auxiliary transformer is subdivided by one of its windings into two partial windings with a center tap. One of the p... | 02/27/2001 |
| 6133650 | DC power source device with standby mode A DC power source device in which the voltage dividing ratio of a voltage dividing circuit of an error detecting circuit is changed from a reference value to a value smaller than the reference value thereby to decrease the voltages of DC outputs. In the d... | 10/17/2000 |
| 5999428 | Invertor with reduced common mode voltage An inverter having a plurality of inverter bridges which operate in parallel and whose output voltage is summed by way of a transformer. The transformer has a number of primary windings and associated secondary windings which correspond to the number of i... | 12/07/1999 |
| 5920132 | Non-rotating portable voltage sag generator A non-rotating portable voltage sag generator includes for each phase a pair of cascaded standard industrial auto-transformers each having, for example, six taps and when they are cascaded the final output voltage of each phase is a product of the per uni... | 07/06/1999 |
| 5862042 | Multiple output DC to DC converter A multiple output dc to dc converter is described that has multiple regulated output voltages. This is achieved by using a common subcircuit in conjunction with multiple input subcircuits to power multiple output circuits. The common subcircuit is used wi... | 01/19/1999 |
| 5825152 | Load-commutated synchronous motor drive A load-commutated synchronous motor drive has a line-commutated network-side converter (3), a current-source dc intermediate link (PL, NL, 5) and a load-commutated machine-side converter (2) for connection to a synchronous machine (1). The motor drive com... | 10/20/1998 |
| 5703415 | Power supply circuit A power supply circuit is provided with a first battery, a second battery, an output terminal, and a voltage dividing circuit for dividing a voltage from the first battery. An output voltage of the dividing circuit is compared with a voltage of the second... | 12/30/1997 |
| 5687068 | Power supply for in-line power controllers and two-terminal electronic thermostat employing same A two-terminal electronic thermostat connectable in series with an electrical heater and a source of AC power and selectively providing AC power to the electrical heater, and a power supply incorporated in the thermostat for providing DC power to the cont... | 11/11/1997 |
| 5642005 | Method for interconnecting two synchronous polyphase AC networks and interconnecting apparatus for the same The method of interconnecting first and second synchronous polyphase AC networks is for regulating transfer of active power from one of the AC networks to the other. The method involves the steps of, for each phase line of the first AC network, connecting... | 06/24/1997 |
| 5355293 | Low-voltage DC power supply A low-voltage DC power supply, e.g. 5 V output, is fed from a higher-voltage input DC source, e.g. 300 V. A plurality of switched transformers each comprise a primary winding (L1) for switchably connecting to the input, a secondary winding (L2) for switch... | 10/11/1994 |
| 5127464 | Thermostat providing electrical isolation therein between connected heating and cooling transformers A low voltage space thermostat adaptable for controlling a heating-only apparatus or a heating and cooling apparatus. The thermostat includes a DC power supply and a voltage step-up transformer having two primary windings and a secondary winding for suppl... | 07/07/1992 |
| 5029285 | Power back feed protection device In a backup power supply, a pair of back-to-back auxiliary transformers are used to isolate the inverter control source, the inverter, and the a.c. line. A single-pole double-throw relay is used to selectably connect the a.c. line to the power supply or t... | 07/02/1991 |
| 5008560 | Load totalizing blocked throwover control An electric utility sub-station having two transformers which transmit electric energy to customers in different service areas. A throwover is provided which is operative, when a failure occurs in one transformer, to switch the load normally carried by th... | 04/16/1991 |
