With Plural Power Windings Patents (Class 323/251)
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Patent number: 9800090Abstract: An uninterruptible power supply to be connected between an AC line and a load has a battery system, an inverter, a transformer, and a controller. The battery system stores battery power. The inverter is operatively connected to the battery system. The transformer comprises a primary winding adapted to be connected to the AC line, a load winding adapted to be connected to the load, and an inverter winding operatively connected to the inverter. The controller controls the inverter to operate in a first mode in which the inverter supplies power to the battery system, a second mode in which the inverter supplies power to the load winding using battery power stored in the battery system, and a third mode in which the inverter supplies power to the primary winding using battery power stored in the battery system.Type: GrantFiled: May 12, 2015Date of Patent: October 24, 2017Assignee: Alpha Technologies Inc.Inventors: Jim Heidenreich, Toby Peck, Craig Paoli, Peter Schmidt, Greg Thomas, John Rodgers
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Patent number: 9261890Abstract: A magnetic amplifier includes a saturable core having a plurality of legs. Control windings wound around separate legs are spaced apart from each other and connected in series in an anti-symmetric relation. The control windings are configured in such a way that a biasing magnetic flux arising from a control current flowing through one of the plurality of control windings is substantially equal to the biasing magnetic flux flowing into a second of the plurality of control windings. The flow of the control current through each of the plurality of control windings changes the reactance of the saturable core reactor by driving those portions of the saturable core that convey the biasing magnetic flux in the saturable core into saturation. The phasing of the control winding limits a voltage induced in the plurality of control windings caused by a magnetic flux passing around a portion of the saturable core.Type: GrantFiled: February 22, 2012Date of Patent: February 16, 2016Assignee: UT-BATTELLE, LLCInventor: Aleksandar D. Dimitrovski
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Patent number: 8848397Abstract: A magnetic integration double-ended converter with an integrated function of a transformer and an inductor includes an integrated magnetic member having a magnetic core with three magnetic columns having at least three windings (NP, NS1, NS2) and at least one energy storage air gap, where a primary winding (NP) and a first secondary winding (NS1) are both wound around a first magnetic column or are both wound around a second magnetic column and a third magnetic column, and a second secondary winding (NS2) is wound around the second magnetic column; an inverter circuit with double ends symmetrically working, acting on the primary winding (NP); and a group of synchronous rectifiers (SR1, SR2), gate electrode driving signals of which and gate electrode driving signals of a group of power switch diodes (S1, S2) of the inverter circuit with the double ends symmetrically working complement each other.Type: GrantFiled: April 19, 2012Date of Patent: September 30, 2014Assignee: Huawei Technologies Co., Ltd.Inventors: Zengyi Lu, Yongfa Zhu, Yadong Bai, Wei Chen, Zhaoguo Jin
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Patent number: 8723367Abstract: In a power supply system, reducing influence of a noise etc., optimal electric power is supplied corresponding to power consumption of a receiving side load, and power consumption is decreased greatly. When a potential difference detector 12 detects that a power supply voltage of the receiving side load is decreased lower than a lower limit voltage threshold or increased higher than an upper limit voltage threshold, a burst interval setting unit sets up a burst signal of a pulse width corresponding to the detection result. A burst signal generator generates a burst signal based on the setup, and excites a control primary inductor. A burst signal detector generates a pulse signal in response to electromotive force of a control secondary inductor.Type: GrantFiled: January 21, 2011Date of Patent: May 13, 2014Assignee: Renesas Electronics CorporationInventor: Atsuhiko Ishibashi
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Patent number: 8598844Abstract: In a power converter, a primary winding receives an input power. In addition, multiple secondary windings transform the input power into multiple charging currents to charge a set of cells via a set of paths. The multiple secondary windings further balance the set of cells based on the charging currents. A ratio between a first turn number of a first secondary winding of the secondary windings and a second turn number of a second secondary winding of the secondary windings is determined by a nominal voltage ratio between two corresponding cells of the set of cells.Type: GrantFiled: October 21, 2011Date of Patent: December 3, 2013Assignee: O2Micro, Inc.Inventors: William Densham, Constantin Bucur, Flavius Lupu, Jiun Heng Goh, Stefan Maireanu
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Patent number: 8405592Abstract: A driving apparatus, a system and a method thereof is provided by the present invention. The driving apparatus has at least an output terminal and includes a driving circuit and a control switch. The control switch is electrically coupled with the driving circuit. The driving circuit receives an input signal and converts the input signal into an analog driving signal. The control switch is controlled by a control signal. When the control switch is turned on, the analog driving signal is able to be sent to the output terminal of the driving apparatus. The control signal further controls the spike current generated as turning on the control switch so as to reduce the spike current. The driving apparatus can be applied to an LCD system, so that the panel and the chips of the LCD system have longer life time, lower electricity consumption and better heat dissipation performance.Type: GrantFiled: June 6, 2008Date of Patent: March 26, 2013Assignee: Novatek Microelectronics Corp.Inventor: Wei-Ta Chiu
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Patent number: 8379415Abstract: Switch mode power converter system and method thereof. The system includes one or more isolation boxes including at least a first isolation box, an input primary winding for receiving an input signal for the switch mode power converter system, and an output secondary winding for generating an output signal for the switch mode power converter system. The switch mode power converter system is configured to convert the input signal to the output signal. One of the input primary winding and the output secondary winding is substantially enclosed in the first isolation box, and the other of the input primary winding and the output secondary winding is not enclosed in the first isolation box. The first isolation box is conductively connected to a constant-voltage source.Type: GrantFiled: January 13, 2012Date of Patent: February 19, 2013Assignee: On-Bright Electronics (Shanghai) Co., Ltd.Inventors: Zhiliang Chen, Xiuhong Zhang, Jun Ye, Shifeng Zhao, Lieyi Fang
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Patent number: 8274271Abstract: A motherboard with overclocking and overvolting functions is provided. The motherboard with an overvolting function includes a specified component, a voltage regulator and a micro-controller. The specified component receives an operating voltage. The voltage regulator generates the operating voltage according to a reference voltage. The micro-controller is electrically connected to an external input device for receiving a control signal issued by the external input device and adjusting the reference voltage according to the control signal.Type: GrantFiled: March 9, 2009Date of Patent: September 25, 2012Assignee: ASUSTeK Computer Inc.Inventors: Chao-Chung Wu, Yu-Chen Lee, Chien-Shien Lin
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Patent number: 8183870Abstract: A battery system utilizes a plurality of transformers interconnected with the battery cells. The transformers each have at least one transformer core operable for magnetization in at least a first magnetic state with a magnetic flux in a first direction and a second magnetic state with a magnetic flux in a second direction. The transformer cores retain the first magnetic state and the second magnetic state without current flow through said plurality of transformers. Circuitry is utilized for switching a selected transformer core between the first and second magnetic states to sense voltage and/or balance particular cells or particular banks of cells.Type: GrantFiled: February 12, 2009Date of Patent: May 22, 2012Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventor: Francis J. Davies
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Patent number: 8174243Abstract: In one embodiment, a switching controller uses an auxiliary winding voltage of a transformer to form a signal representative of current flow through a secondary winding of the transformer. The controller is configured to limit a current through a secondary winding to a maximum value.Type: GrantFiled: March 19, 2007Date of Patent: May 8, 2012Assignee: Semiconductor Components Industries, LLCInventor: Francois Lhermite
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Patent number: 8148942Abstract: In a power converter, a primary winding receives an input power. In addition, multiple secondary windings transform the input power into multiple charging currents to charge a set of cells via a set of paths. The multiple secondary windings further balance the set of cells based on the charging currents. A ratio between a first turn number of a first secondary winding of the secondary windings and a second turn number of a second secondary winding of the secondary windings is determined by a nominal voltage ratio between two corresponding cells of the set of cells.Type: GrantFiled: November 5, 2009Date of Patent: April 3, 2012Assignee: O2Micro International LimitedInventors: William Densham, Constantin Bucur, Flavius Lupu, Jiun Heng Goh, Stefan Maireanu
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Patent number: 8143861Abstract: At the time of charging a power storage device from a commercial power supply, electric power from the commercial power supply is applied to a neutral point of each of first and second motor generators. A rotation preventing control unit (222) determines one phase to be subjected to switching control in the first inverter, based on a rotation angle (?1) of the first motor generator. Further, rotation preventing control unit (222) calculates torque generated in the first motor generator, generates a torque control value for canceling out the torque, and outputs the value to a phase voltage operating unit (214) for motor control.Type: GrantFiled: June 12, 2007Date of Patent: March 27, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hichirosai Oyobe, Tetsuhiro Ishikawa, Makoto Nakamura, Yukihiro Minezawa
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Patent number: 8125802Abstract: Switch mode power converter system and method thereof. The system includes one or more isolation boxes including at least a first isolation box, an input primary winding for receiving an input signal for the switch mode power converter system, and an output secondary winding for generating an output signal for the switch mode power converter system. The switch mode power converter system is configured to convert the input signal to the output signal. One of the input primary winding and the output secondary winding is substantially enclosed in the first isolation box, and the other of the input primary winding and the output secondary winding is not enclosed in the first isolation box. The first isolation box is conductively connected to a constant-voltage source.Type: GrantFiled: March 26, 2008Date of Patent: February 28, 2012Assignee: On-Bright Electronic (Shanghai) Co., Ltd.Inventors: Zhiliang Chen, Xiuhong Zhang, Jun Ye, Shifeng Zhao, Lieyi Fang
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Patent number: 7800922Abstract: A switching power supply unit is provided, which can output a DC voltage and an AC voltage with a minimized installation space. A switching circuit is provided between a winding of a transformer and a main battery. A rectifier circuit is provided between other windings of the transformer and an accessory battery. Output terminals for outputting an AC output voltage are provided at the other side of the transformer, the AC output voltage being generated based on a DC input voltage inputted from the main battery. A DC output voltage and the AC output voltage are generated based on the DC input voltage, and then outputted. The transformer is shared by a generation path of the DC output voltage and a generation path of the AC output voltage. An AC voltage input section to be inputted with the AC input voltage from external equipment may be provided at the other side of the transformer.Type: GrantFiled: October 23, 2007Date of Patent: September 21, 2010Assignee: TDK CorporationInventors: Yoshinobu Takayanagi, Kunihiro Sato
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Patent number: 7741819Abstract: In order to reduce the cost of a chopping converter supplying a continuous voltage at the terminals of a load (Z), a circuit with two windings (Lp, Ls) and a single magnetic core is proposed, according to the present invention, which enables the cost and the size of the circuit to be reduced. It is then necessary to add two diodes (D3, D4) to the circuit, but these elements are inexpensive and of small size.Type: GrantFiled: February 5, 2008Date of Patent: June 22, 2010Assignee: Hispano SuizaInventor: Bertrand Lacombe
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Patent number: 7710085Abstract: An energy transfer element includes a first winding coupled to an input circuit and a second winding coupled to an output circuit. The first winding has a first unit and a second unit, and the second winding is wound between the first unit of the first winding and the second unit of the first winding. The energy transfer element further includes a third winding provided between the first unit of the first winding and the second winding. The third winding is used to supply a bias voltage of the input circuit, and a winding width of the third winding is greater than a winding width of the first unit of the first winding and a width of the second winding.Type: GrantFiled: November 14, 2007Date of Patent: May 4, 2010Assignee: Fairchild Korea Semiconductor, Ltd.Inventors: Young-Bae Park, Jin-Tae Kim, Gwan-Bon Koo
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Patent number: 7656137Abstract: In order to reduce the cost of a chopping converter supplying a continuous voltage at the terminals of a load (Z), a circuit with three windings (Lp, Ls1, Ls2) and a single magnetic core is proposed, according to the present invention, which enables the cost and the size of the circuit to be reduced. It is then necessary to add two diodes (D3, D4) to the circuit, but these elements are of low cost and of low size.Type: GrantFiled: February 5, 2008Date of Patent: February 2, 2010Assignee: Hispano SuizaInventors: Bertrand Lacombe, Ivica Salopek
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Patent number: 7436161Abstract: An improved circuit and method for decreasing the size and cost of switch mode power supplies is disclosed. In one illustrative example, a feedback circuit for a switch mode power supply is disclosed that includes two error amplifiers. The input of a first error amplifier is coupled to a voltage source associated with a load for the supply, and the input of a second error amplifier is coupled to a current source also associated with the load for the supply. Each one of the error amplifiers includes an adjustable shunt regulator that functions as an amplifier stage and diode. Also, the outputs of the shunt regulators are connected together.Type: GrantFiled: April 21, 2005Date of Patent: October 14, 2008Assignee: ADC DSL Systems, Inc.Inventor: Michael Carter
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Patent number: 7378828Abstract: A DC-DC converter suitable for multiple converter circuit topologies is disclosed. The DC-DC converter utilizes magnetic feedback of the output load current to provide broad inductance control of a magnetic element, while inhibiting saturation of the switched winding or windings of the magnetic element.Type: GrantFiled: November 9, 2004Date of Patent: May 27, 2008Assignee: The Boeing CompanyInventor: Randy L. Brandt
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Patent number: 6917225Abstract: The driver circuit for driving a switching transistor comprises a driver transformer for driving the switching transistor and an output stage for driving the driver transformer, and an output of the driver circuit is used for providing also said switching voltage. The switching voltage is derived advantageously from the primary winding of the driver transformer. Preferably a terminal of the primary winding of the driver transformer is directly wired to the gate electrode of the MOS transistor.Type: GrantFiled: May 2, 2003Date of Patent: July 12, 2005Assignee: Thomson Licensing S.A.Inventors: Daniel Lopez, Jean-Paul Louvel
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Publication number: 20040036454Abstract: A signal transformer having a primary limb (1) and a first secondary limb (4) is specified, a primary winding (2) at least partly enclosing the primary limb (1) and a secondary winding (6) at least partly enclosing the first secondary limb (4) and the primary limb (1) being connected to the first secondary limb (4). Furthermore, 2n+1 additional secondary limbs (5) are provided, where n=0, 1, 2, 3, . . . , and the additional secondary limbs (5) are connected to the primary limb (1) and the first secondary limb (4). At least one secondary winding (6) is in each case provided for the additional secondary limbs (5) and for the first secondary limb (4), the secondary winding (6) at least partly enclosing the respective secondary limb (4, 5). Moreover, a control winding (3) is provided for each secondary limb (4, 5), said control winding at least partly enclosing the respective secondary limb (4, 5).Type: ApplicationFiled: August 22, 2003Publication date: February 26, 2004Applicant: ABB Research LtdInventors: Pieder Joerg, Alper Akdag
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Patent number: 6483279Abstract: A reactance coil (1) has an annular core (2) on which reactance coils are wound. Said reactance coils (3) are divided up into coil sectors 6 (4) that are separated from each other by means of gaps (5) in the windings. The gaps (5) in the windings reduce reactance coil (3) capacity and the reactance coils (3) have resonances with higher maximum values for impedance and greater bandwidths.Type: GrantFiled: May 30, 2001Date of Patent: November 19, 2002Assignee: Vacuumschmelze GmbHInventors: Hans-Joachim Pöss, Franz Wagner
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Patent number: 6449175Abstract: A switched magamp post regulator in a power converter incorporating a switched set mode control circuit which minimizes the power loss associated with the control transistor of a set mode magamp post regulator is disclosed. Power loss in set mode is minimized by switching the control transistor on and off synchronously with the main transformer. The incorporation of set mode and switching allows the use of less expensive ferrite core materials with increased efficiency for operation at higher frequencies and higher temperatures.Type: GrantFiled: August 11, 2000Date of Patent: September 10, 2002Assignee: Astec International LimitedInventors: Jason Cuadra, Manolo Mariano M. Melgarejo
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Patent number: 6424247Abstract: In an inverter transformer, since a plurality of secondary windings 2, 2 are wound around a plurality of bar-shaped magnetic cores 3, 3 which are formed independently of each other and electromagnetically coupled to a primary winding 1 with equivalent characteristics, there are obtained a plurality of secondary windings 2, 2 which function independently of each other and are electromagnetically equivalent to each other as well, and an open magnetic circuit structure. It does not happen that the numbers of both the primary and secondary winding increase in proportion to the increase in the number of cold cathode lamps, but only the number of the secondary winding increases while the primary winding is common and does not increase in number.Type: GrantFiled: March 1, 2001Date of Patent: July 23, 2002Assignee: Minebea Co., Ltd.Inventor: Shinichi Suzuki
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Patent number: 6359424Abstract: A switching circuit for generating pulsed power including a plurality of capacitors connected in parallel with first and second output terminals, a plurality of series circuits of a primary conductor and a static induction thyristor connected in parallel with respective capacitors, a plurality of magnetic cores with which the primary conductors are magnetically coupled, respectively, and a series arrangement of a plurality of secondary conductors each being magnetically coupled with respective magnetic cores, both ends of the series arrangement being connected to first and second output terminals, respectively.Type: GrantFiled: February 16, 2001Date of Patent: March 19, 2002Assignee: NGK Insulators, Ltd.Inventors: Katsuji Iida, Tatsuhiko Hatano, Takeshi Sakuma, Wataru Shionoya
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Publication number: 20010030527Abstract: A switching circuit for generating pulsed power including a plurality of capacitors connected in parallel with first and second output terminals, a plurality of series circuits of a primary conductor and a static induction thyristor connected in parallel with respective capacitors, a plurality of magnetic cores with which the primary conductors are magnetically coupled, respectively, and a series arrangement of a plurality of secondary conductors each being magnetically coupled with respective magnetic cores, both ends of, the series arrangement being connected to first and second output terminals, respectively.Type: ApplicationFiled: February 16, 2001Publication date: October 18, 2001Applicant: NGK Insulators, Ltd.Inventors: Katsuji Iida, Tatsuhiko Hatano, Takeshi Sakuma, Wataru Shionoya
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Patent number: 5691891Abstract: A rectifier for a switching power supply or the like. The recitifier has a plurality of diodes coupled in parallel, each diode having in series therewith a saturable inductor and a node disposed between the diode and the inductor to form a diode/inductor pair. At least one resistor is connected between at least two of the nodes to assure nearly equal current flow in the diodes. Alternatively, a link winding on at least two of the inductors are coupled together to achieve current balancing.Type: GrantFiled: May 3, 1996Date of Patent: November 25, 1997Assignee: Lucent Technologies Inc.Inventors: Greg H. Fasullo, Mark Elliott Jacobs, Kenneth John Timm
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Patent number: 5532894Abstract: A power supply is provided for a presentation system having a light source which allows for overdriving of the light source, but protects against transient surges on the input line when overdriving the light source. The power supply includes an input line connected to the external ac source, two output lines, and a relay selectively connecting the input line to one of the two output lines. The relay is indirectly controlled by a voltage sense circuit which converts the ac source voltage to a dc output voltage. The dc output voltage is examined to determine whether the input line is in a low- or high-voltage state, the high-voltage state corresponding to a surge on the line.Type: GrantFiled: July 11, 1994Date of Patent: July 2, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventor: Michael C. Sweaton
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Patent number: 5283411Abstract: A microwave oven driving circuit for stably driving a microwave oven wherein a certain output of a magnetron can be generated by controlling a microcomputer. First and second comparing portions control a voltage supplied from a power supply portion and an output of the magnetron to increase in stages so as to obtain a normal output of the magnetron. Also, the output of the magnetron is gradually decreased without being too abrupt even if the output of the generating portion must be decreased as cooking is completed, thereby improving durability and cooking efficiency of the microwave oven.Type: GrantFiled: May 12, 1992Date of Patent: February 1, 1994Assignee: Samsung Electronics Co., Ltd.Inventor: Ann Sung-Wan
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Patent number: 5245521Abstract: A method and apparatus for suppressing capacitive current in transformers is described. The winding of a transformer is constructed or modified into two substantially identical winding halves wired in a series aiding configuration. Two leads emanate from the center point of the winding, where the two halves are connected in series. This center point is at a constant potential throughout the switching cycle of the transformer. Suppression of the capacitive current in the input/output leads of the transformer is achieved by introducing common mode impedance into each lead and a corresponding center tap lead. The common mode impedance can be introduced in a variety of ways such as: running the pair of leads through a toroid, bead or sleeve of magnetic material; winding the leads on a magnetic toroid or rod; or using the magnetic core structure to introduce the impedance.Type: GrantFiled: January 31, 1991Date of Patent: September 14, 1993Assignee: International Business Machines CorporationInventor: James H. Spreen
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Patent number: 4930063Abstract: A voltage regulator particularly adapted to A.C. distributed power systems requiring independent voltage regulation at a plurality of frequency responsive power supply modules energized by a power source at a common alternating frequency is provided by resonant tuning of the regulator circuit. An LC resonant circuit determines the operating frequency of the regulator, and may be operated above or below the excitation frequency. The output voltage is applied to a current amplifier which energizes a linearly variable inductor in accordance with the sensed D.C. output voltage. Changes in the output voltage result in changes in the tuned frequency of the LC circuit and the corresponding corrective change in the output voltage. Circuits providing both voltage and current regulation are described.Type: GrantFiled: April 17, 1989Date of Patent: May 29, 1990Assignee: Unisys CorporationInventors: Christopher P. Henze, Joseph H. Mulkern
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Patent number: 4914375Abstract: An automatic power factor control apparatus for an inductive load such as an AC induction motor includes a circuit for producing a signal varying in accordance with the load power factor, which is applied to control the duty cycle with which switching elements are alternately set in the conducting and non-conducting states by high frequency switching operation. A level of voltage applied to the control winding of a saturable reactor connected in series with the load is controlled by the switching elements, and the saturable reactor thereby continuously controls the input voltage and load current of the inductive load in accordance with the power factor.Type: GrantFiled: June 6, 1989Date of Patent: April 3, 1990Assignee: Arex Electronics CorporationInventor: Takefumi Hatanaka
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Patent number: 4652776Abstract: An AND function gating circuit for A.C. signals comprising several magnetic circuits around a common limb, each circuit having a separate input winding and a single output winding on the common limb. The magnetic flux level in the common limb is greatly increased when all input windings are simultaneously energized by A.C. signals of the same frequency and in phase relative to the output achieved under other input signal conditions.Type: GrantFiled: April 10, 1985Date of Patent: March 24, 1987Assignee: Westinghouse Brake & Signal Company LimitedInventor: Terence M. George
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Patent number: 4639610Abstract: A rotating flux transformer having at least two magnetic cores, each in the form of a torus, with each magnetic core having poloidal and toroidal windings. The need for breaking the torus and bringing out leads from the poloidal winding is eliminated by passing each torus through the core window of the remaining torus, or tori. Each poloidal winding is shorted, with the toroidal winding, or windings, of the other magnetic core or cores, inducing an excitation voltage into each shorted poloidal winding which is 90.degree. out of phase with the voltage applied to the toroidal winding on the same magnetic core.Type: GrantFiled: December 10, 1985Date of Patent: January 27, 1987Assignee: Westinghouse Electric Corp.Inventors: Robert M. Del Vecchio, Theodore R. Specht
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Patent number: 4638149Abstract: Power-processing unit uses AC buses (30, 32) to supply all current dependent needs such as connections (54, 56) to an ion thruster through an inductor (88) and the primary of a transformer (90), to assure limited currents to such loads. Where temperature control is also required, such as to the main discharge vaporizer heater connection (36, 38), switches (100, 102) are serially connected with inductor (96) and the primary of transformer (98). Temperature sensor (104) controls the switches (100, 102) for temperature regulation.Type: GrantFiled: June 27, 1983Date of Patent: January 20, 1987Assignee: Hughes Aircraft CompanyInventors: Frank J. Wessel, Donald J. Hancock
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Patent number: 4375077Abstract: A circuit for regulation of a D.C. output voltage in a switching power supply. The circuit contains a control transformer having primary, secondary and control windings. The output of the circuit is connected from the primary and secondary windings and is controlled by a switching element connected from the control winding. The circuit output error is provided to duty cycle modulation circuitry which varies the duty cycle of the switching element, thereby controlling the output voltage level.Type: GrantFiled: February 26, 1981Date of Patent: February 22, 1983Assignee: Data General CorporationInventor: James B. Williams
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Patent number: 4343034Abstract: A linear power supply is preregulated to compensate for variations in load and power line voltage. The inductance on the primary side of the power supply step down transformer is varied by a current controlled inductor to efficiently maintain the desired power supply output voltage. A variable current is supplied to the inductor by a d.c. power source under control of an integrator which monitors output voltage fluctuations. In one embodiment of the invention, a voltage selector is included for use with power supplies which provide more than one output voltage. This selector automatically selects the most heavily loaded output voltage for control of the inductor.Type: GrantFiled: August 18, 1980Date of Patent: August 3, 1982Assignee: Hewlett-Packard CompanyInventors: Richard B. Wells, Chester G. Haibel, Jr., Richard L. Hilton
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Patent number: 4328458Abstract: A variable leakage transformer having a closed main magnetic path and a closed submagnetic path having a leg common with said main magnetic path. A primary winding is wound on said common leg, and a secondary winding is wound on said main magnetic path. The magnetic flux in the common leg is controlled by other control windings which are connected to a control DC power source. The primary winding has two portions, and one of them is closely coupled magnetically with the secondary winding in order to improve the output waveform. By controlling the magnetic flux in the sub-magnetic path, the leakage of the flux induced by the primary winding from the main magnetic path to the sub-magnetic path can be controlled; thus the coupling between the primary and the secondary winding, and conduction period in each cycle of the AC output voltage are controlled. The control of the conduction period in each cycle provides control of the power transmitted from the primary winding to the secondary winding.Type: GrantFiled: December 4, 1979Date of Patent: May 4, 1982Assignee: TDK Electronics Co., Ltd.Inventor: Hirayama Hiromitsu