With Automatic Control Of The Magnitude Of Output Voltage Or Current Patents (Class 363/25)
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Patent number: 9114763Abstract: A battery pack includes a main battery pack and a sub-battery pack. Each of the main battery pack and the sub-battery pack includes a power supply including a plurality of unit cells, a service plug connector including shutoff terminals of the power supply, and an output connector including output terminals of the power supply. The output connector is in a form of a connector capable of being mated with the service plug connector and a power supply connector of a vehicle.Type: GrantFiled: December 27, 2012Date of Patent: August 25, 2015Assignee: YAZAKI CORPORATIONInventor: Yoshiaki Ichikawa
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Patent number: 9118243Abstract: A power converter (14) can include a switching system (18) to convert a direct current (DC) input voltage to an output voltage based on a switching signal having a duty-cycle. A controller (16) can set the duty-cycle of the switching signal, depending on the DC input voltage, to one of a substantially constant value, such that the output voltage follows the DC input voltage in a normal mode, and a value that varies inversely with respect to the DC input voltage, such that the output voltage is substantially constant in another mode.Type: GrantFiled: October 25, 2010Date of Patent: August 25, 2015Assignee: Hewlett-Packard Development Company, L.P.Inventors: David Paul Mohr, Daniel Humphrey
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Patent number: 9083252Abstract: A DC-DC converter includes a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter. A primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter. An output correction circuit controls a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.Type: GrantFiled: October 23, 2012Date of Patent: July 14, 2015Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Erhan Ozalevli, David Daniels, Luthuli E. Dake
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Patent number: 9071079Abstract: The present disclosure provides a power supply system. The power supply system includes a plurality of power supply devices connected in parallel. Output terminals of the plurality of power supply devices are coupled to a common supply line. Each of the plurality of power supply devices includes a DC-to-DC converter, a transformer, a switching control device, a rectifying device, and a judging device. The judging device receives a feedback voltage, an error signal and a second AC voltage to determine whether the power supply device is normal, wherein the feedback voltage is a voltage division of an output voltage on the common supply line, the error signal is an output of the switching control device, and the second AC voltage is retrieved from a second winding set of the transformer.Type: GrantFiled: October 17, 2011Date of Patent: June 30, 2015Assignee: DELTA ELECTRONICS, INC.Inventors: Chu Kuang Liu, Ching Long Tsai, Hung Liang Cho, Wei Hsin Wen
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Publication number: 20150138839Abstract: An AC-to-DC converter circuit includes DC-to-DC converter that in turn includes a secondary side circuit. The secondary side circuit includes a secondary winding, a pair of bipolar transistor-based self-driven synchronous rectifiers, a pair of current splitting inductors, and an output capacitor. Each of the synchronous rectifiers includes a bipolar transistor and a diode whose anode is coupled to the transistor collector and whose cathode is coupled to the transistor emitter. The current splitting inductors provide the necessary base current to the bipolar transistors at the appropriate times such that the bipolar transistors operate as synchronous rectifiers.Type: ApplicationFiled: November 18, 2013Publication date: May 21, 2015Applicant: IXYS CORPORATIONInventor: Kyoung Wook Seok
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Patent number: 9006624Abstract: An induction heating system includes an induction heating coil operable to inductively heat a load with a magnetic field, a detector for detecting a current feedback signal corresponding to a current flowing through the induction heating coil, and a controller for detecting a switching transient in the current feedback signal and determining a resonant frequency of the system based on a characteristic of the switching transient.Type: GrantFiled: July 22, 2010Date of Patent: April 14, 2015Assignee: General Electric CompanyInventors: Daniel Brosnan, Mariano Filippa, Kresimir Odorcic
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Patent number: 9001534Abstract: A transformer driver circuit couples to a transformer having a primary winding, a secondary winding, and a transformer tap that is connected to a first voltage source. The primary winding electrically connects at its ends to respective unipolar controllable current sinks that form part of an integrated circuit. The transformer driver circuit operates by each current sink selectively sinking current from the end of the primary winding to which it is connected so as to cause current to flow in the secondary winding in a push-pull fashion. The transformer driver circuit further includes a load electrically connected to the secondary winding and protection circuitry operative to protect the integrated circuit from input levels greater than it can withstand.Type: GrantFiled: December 17, 2010Date of Patent: April 7, 2015Assignee: Broadcom Europe LimitedInventors: Jonathan Ephraim David Hurwitz, Seyed Danesh, Steven Maughan
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Patent number: 8964413Abstract: A resonant converter comprising: a controllable current source; a resonant tank circuit coupled to the current source; and an isolated buck-type converter coupled to the resonant tank circuit, the isolated buck-type converter having an output, wherein the resonant tank circuit enables switches in the isolated buck-type converter to switch under soft-switching conditions. In some embodiments, the controllable current source is a switch-mode-type current source. In some embodiments, the isolated buck-type converter comprises a half-bridge converter. In some embodiments, the isolated buck-type converter comprises a full-bridge converter. In some embodiments, the isolated buck-type converter comprises a push-pull converter.Type: GrantFiled: April 22, 2010Date of Patent: February 24, 2015Assignee: Flextronics AP, LLCInventor: Martin Liu
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Publication number: 20150036390Abstract: An apparatus comprises a power converter circuit and a control circuit. The power converter circuit includes a primary circuit side and a secondary circuit side. The primary circuit side includes a plurality of primary switches, and the secondary circuit side includes a plurality of synchronous rectifiers and an inductor. The control circuit is configured to operate the synchronous rectifiers synchronously with the primary switches when inductor current at the inductor is greater than or equal to a reference inductor current, and operate the synchronous rectifiers in a bidirectional mode when the inductor current is less than the reference inductor current, wherein energy is delivered from the primary side to the secondary side and from the secondary side to the primary side during the bidirectional mode.Type: ApplicationFiled: July 31, 2013Publication date: February 5, 2015Inventors: Yingyang Ou, Renjian Xie, Qingyi Huang
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Patent number: 8929104Abstract: The present invention provides a new type flow control system comprising a valve control circuit and a power source circuit. Two terminals of the primary coil of the power source circuit transformer are respectively connected with two power source circuit FETs, the secondary coil of the power source circuit transformer is connected to the voltage output terminal of the power source circuit through a power source rectification circuit. The gates of the power source circuit FETs are connected with a switching regulator. The AC input terminal of the valve control circuit is connected with a valve control circuit transformer. The primary coil of the valve control circuit transformer is connected with a valve control circuit FET, the secondary coil of the transformer is connected to a mechanical valve through a valve control rectification circuit. A microcontroller outputs PWM signals to the gate of the valve control circuit FET.Type: GrantFiled: December 14, 2010Date of Patent: January 6, 2015Assignee: Bejing Sevenstar Electronics Co., Ltd.Inventors: Changhua Mou, Maolin Wang
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Publication number: 20140376281Abstract: A switching power supply device wherein an input voltage is stepped-up by first and second switching elements that are driven on and off in a complementary way, thus obtaining a stabilized output voltage. The switching power supply device includes a comparator that detects fluctuation in an operating reference potential of the second switching element accompanying fluctuation in the input voltage, and a drive signal generator circuit that carries out a logical operation on an output control signal, a dead time signal, and the output signal of the comparator, thus generating first and second drive signals that determine the on-state time of the first and second switching elements.Type: ApplicationFiled: September 12, 2014Publication date: December 25, 2014Applicant: FUJI ELECTRIC CO., LTD.Inventor: Hidetomo OHASHI
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Publication number: 20140362616Abstract: A dual resonance circuit is formed of two transformers, two resonance inductors and two resonance capacitors for a resonance type switching power supply employing parallel connected transformers. The secondary winding of the transformer is configured in a center tap structure, and a top and bottom symmetrical voltage multiplying rectifier is connected to the secondary winding coupled with the parallel connected transformers, thereby obtaining the same effect as when one transformer is used. The present invention achieves a low loss in the typical resonance type half bridge power supply even though two transformers are employed, and the switching power supply with a lowered height and thinned structure can be provided with the aid of the optimized arrangements of the resonance devices. The internal power loss can be lowered by using two parallel connected transformers as compared to a resonance type switching power supply which employs one transformer.Type: ApplicationFiled: June 17, 2013Publication date: December 11, 2014Inventor: Tae-Young AN
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Publication number: 20140362607Abstract: 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: ApplicationFiled: August 22, 2014Publication date: December 11, 2014Inventors: Zengyi Lu, Yongfa Zhu, Yadong Bai, Wei Chen, Zhaoguo Jin
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Patent number: 8896230Abstract: The present invention provides an LED backlight drive circuit, which includes a first power supply module, an electrical inductor, a rectifier diode, a MOS transistor, an electrolytic capacitor, an LED light string, a voltage division module, a voltage comparator, a second power supply module, and an LED constant-current drive chip. The LED backlight drive circuit is arranged to include a voltage comparator in an external circuit of the LED constant-current drive chip to detect output voltage of the drive circuit so that high voltage, the voltage comparator is caused to supply a low voltage level to forcibly pull down a PWM dimming signal or an ENA enabling signal of the LED constant-current drive chip to achieve an over-voltage protection function and also enable removal of over-voltage protection module from a conventional LED constant-current drive chip.Type: GrantFiled: March 5, 2013Date of Patent: November 25, 2014Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.Inventor: Hua Zhang
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Patent number: 8890366Abstract: A system for exchanging energy wirelessly comprises an array of at least three objects having a resonant frequency, each object is electromagnetic (EM) and non-radiative, and generates an EM near-field in response to receiving the energy, wherein each object in the array is arranged at a distance from all other objects in the array, such that upon receiving the energy the object is strongly coupled to at least one other object in the array via a resonant coupling of evanescent waves; and an energy driver for providing the energy at the resonant frequency to at least one object in the array, such that, during an operation of the system, the energy is distributed from the object to all other objects in the array.Type: GrantFiled: September 30, 2010Date of Patent: November 18, 2014Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Bingnan Wang, Koon Hoo Teo, Da Huang
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Patent number: 8878456Abstract: A filter device (10) for filtering high-frequency interferences, such as due to switching flanks of a DC converter, has a current path (4) between an input (2) and an output (3), and an inductor (L) in the current path (4), wherein the inductor (L) is disposed in the current path (4) as a first component and is connected to the input (2), and wherein a reverse polarity protective diode (D) is disposed in series with the inductor (L) downstream thereto.Type: GrantFiled: June 5, 2009Date of Patent: November 4, 2014Assignee: Continental Automotive GmbHInventors: Stefan Holzinger, Christian Stöger
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Patent number: 8861228Abstract: A high voltage controller configured to drive a high voltage generator. The high voltage controller includes a voltage select input and a current select input, an actual voltage input and an actual current input. First circuitry is configured to generate an alternating current (AC) drive signal. Second circuitry configured to generate a direct current (DC) drive signal. Closed loop control circuitry is configured to adjust the DC drive signal based on at least one of the voltage select and current select inputs and at least one of the actual voltage and actual current inputs. The first circuitry may include a push-pull circuit. The second circuitry may include a pulse width modulation (PWM) controller. A high voltage generator may be coupled to the AC and DC drive signals. The high voltage generator may include a high voltage transformer having a pair of primary windings and center tap. The AC drive signal may be coupled to the primary windings and the DC drive signal may be coupled to the center tap.Type: GrantFiled: December 6, 2010Date of Patent: October 14, 2014Assignee: Durr Systems GmbHInventors: Farhad Berton, Josef Braun
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Publication number: 20140293662Abstract: A switched mode power supply (SMPS) is disclosed in which a simple primary side controller is used to send a single pulse of energy to the secondary side to switch on an output voltage controller. The pulse is sent across the main power train and a filtering arrangement is provided on the secondary side to minimise the energy at the output of the SMPS while maximising the energy supplied to the output voltage controller. Advantageously, the SMPS is configured such that the maximum amount of energy transferred from the primary side to the secondary side during a start-up operation is inherently limited. Protection against short circuit conditions and malfunctions is therefore provided without requiring complicated circuitry.Type: ApplicationFiled: April 15, 2011Publication date: October 2, 2014Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Oscar Persson, Mikael Appelberg, Marko Leskovec
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Patent number: 8817498Abstract: A DC to DC converter system, includes inverter circuitry having a first and a second switch, the inverter circuitry further configured to generate a first and a second gate control signal, the signals configured to open and close the first and second switch, respectively, and generate an AC signal from a DC input signal. The system further includes transformer circuitry configured to transform the AC signal into a sinusoidal AC signal, second stage circuitry configured to rectify the sinusoidal AC signal to a DC output signal, and hybrid control circuitry configured to modulate the first and second gate control signals, wherein the modulation comprises pulse frequency modulation (PFM) and pulse width modulation (PWM).Type: GrantFiled: April 16, 2012Date of Patent: August 26, 2014Assignee: Fairchild Semiconductor CorporationInventor: Hangseok Choi
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Patent number: 8787044Abstract: An energy recovery snubber circuit for use in switching power converters. The power converters may include a switch network coupled to a primary winding of an isolation transformer, and rectification circuitry coupled to a secondary winding of the isolation transformer. The energy recovery snubber circuit may include clamping circuitry that is operative to clamp voltage spikes and/or ringing at the rectification circuitry. The clamped voltages may be captured by an energy capture module, such as a capacitor. Further, the energy recovery snubber circuitry may include control circuitry operative to return the energy captured by the energy capture module to the input of the power converter. To maintain electrical isolation between a primary side and a secondary side of the isolation transformer, a second isolation transformer may be provided to return the captured energy back to the input of the power converter.Type: GrantFiled: May 7, 2010Date of Patent: July 22, 2014Assignee: Flextronics AP, LLCInventors: Zaohong Yang, Paul Garrity
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Patent number: 8724348Abstract: A power-supply unit including a transformer, a full bridge circuit having four arm switches on a primary side of the transformer, a rectifier and smoothing circuit including two synchronous rectifier switches on a secondary side of the transformer, a choke coil, and a capacitor, an output terminal in the rectifier and smoothing circuit, a control circuit controlling ON/OFF of the four arm switches of the full bridge circuit and the two synchronous rectifier switches of the rectifier and smoothing circuit, a resonant inductor including a leakage inductor component and a parasitic inductor component on the primary side of the transformer, and a resonant capacitor, and in which the control circuit includes a timing variable unit which varies switching timings of the two synchronous rectifier switches of the rectifier and smoothing circuit based on an output current flowing in the output terminal provided in the rectifier and smoothing circuit.Type: GrantFiled: August 26, 2010Date of Patent: May 13, 2014Assignee: Hitachi, Ltd.Inventors: Takashi Sase, Akihiko Kanouda, Yosuke Tsuyuki
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Patent number: 8711580Abstract: A resonant conversion system is provided, in which a resonant converter receives an input voltage to generate an output voltage, and a buck converter provides the input voltage of the resonant converter, and controls the input voltage to perform an over-current protection process.Type: GrantFiled: May 20, 2011Date of Patent: April 29, 2014Assignee: Delta Electronics, Inc.Inventors: Jinfa Zhang, Lei Cai, Jiaojun Sun, Guodong Yin
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Patent number: 8699237Abstract: An inverter with soft switching is used for a high step-up ratio and a high conversion efficiency. The inverter includes an isolation voltage-quadrupling DC converter and an AC selecting switch. The isolation voltage-quadrupling DC converter includes an active clamping circuit. By a front-stage converter circuit, a continuous half-sine-wave current is generated. By a rear-stage AC selecting switch, the half-sine-wave current is turned into a sine-wave current. Thus, electricity may be supplied to an AC load or the grid. The circuit is protected by isolating the low-voltage side from the high-voltage side. The conversion efficiency is high. The leakage inductance is low. The switch stress is low. The inverter is durable and reliable. Hence, the inverter is suitable for use in a photovoltaic system to increase the total conversion efficiency.Type: GrantFiled: May 30, 2012Date of Patent: April 15, 2014Assignee: National Tsing Hua UniversityInventors: Ching-Tsai Pan, Ming-Chieh Cheng, Yu-Chuan Wang, En-Lin Chen
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Patent number: 8659916Abstract: A control circuit for a resonant power converter and a control method thereof are disclosed. The control circuit comprises a first transistor and a second transistor switching a transformer through a resonant tank. A controller receives a feedback signal for generating a first switching signal and a second switching signal coupled to drive the first transistor and the second transistor respectively. The feedback signal is correlated to an output of the resonant power converter. A diode is coupled to the second transistor for detecting the state of the second transistor for the controller. The first switching signal and the second switching signal are modulated to achieve a zero voltage switching (ZVS) for the second transistor.Type: GrantFiled: May 23, 2012Date of Patent: February 25, 2014Assignee: System General Corp.Inventors: Ta-Yung Yang, Tien-Chi Lin
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Patent number: 8654546Abstract: A control circuit of a resonant power converter is disclosed. The control circuit comprises a first transistor and a second transistor for switching a transformer and a resonant tank comprising a capacitor and an inductor. A controller is configured to receive a feedback signal correlated to the output of the power converter for generating a first switching signal and a second switching signal to drive the first transistor and the second transistor, respectively. A diode coupled to the first transistor and the resonant tank for detecting the state of the first transistor and generating a detection signal for the controller. The detection signal indicates if the transistors are in a zero voltage switching (ZVS) state. If the transistors are not in the ZVS state, the switching frequency of the transistors will be increased.Type: GrantFiled: March 21, 2012Date of Patent: February 18, 2014Assignee: System General Corp.Inventors: Tien-Chi Lin, Hang-Seok Choi, Ta-Yung Yang
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Publication number: 20140022826Abstract: The invention relates to a quasi-resonant push-pull converter and the method for controlling the same, said push-pull converter comprising: a direct current (DC) input power supply configured to supply DC input for the converter; a first power input unit and a second power input unit, connected to said DC input power supply, respectively and configured to supply input for the converter in different periods, comprising a first power switching tube and a second power switching tube, a first primary winding and a second primary winding; a power output circuit, configured to supply output of the converter, comprising secondary windings and full-bridge rectification circuits; a first output capacitor and a second output capacitor connected to said power output circuit and configured to store DC electric energy output by the power output circuit in which a resonant element is arranged to achieve a quasi-resonant switching circuit through voltage feedback; and a switching circuit being controlled through voltage feeType: ApplicationFiled: January 21, 2012Publication date: January 23, 2014Applicant: LIAN ZHENG ELECTRONICS (SHENZHEN) CO., LTD.Inventors: Zhifeng He, Yucheng Yang
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Patent number: 8634214Abstract: A current resonance power supply includes a transformer having a primary winding and a secondary winding, two switching elements connected to one end of the primary winding of the transformer and arranged in series, a resonance capacitor connected to the other end of the primary winding, and a voltage detection unit connected between the one end of the primary winding and the two switching elements and configured to detect that AC voltage input to a primary side of the transformer becomes lower, wherein operations of the switching elements are controlled based on a detection result of the voltage detection unit.Type: GrantFiled: May 17, 2011Date of Patent: January 21, 2014Assignee: Canon Kabushiki KaishaInventor: Keisuke Samejima
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Publication number: 20140009978Abstract: A controller for a power converter and method of operating the same. In one embodiment, the controller includes an inductor-inductor-capacitor (“LLC”) controller configured to receive an error signal from an error amplifier to control a switching frequency of an LLC stage of the power converter to regulate an output voltage thereof. The controller also includes a power factor correction (“PFC”) controller configured to control a bus voltage produced by a PFC stage of the power converter and provided to the LLC stage so that an average switching frequency thereof is substantially maintained at a desired switching frequency.Type: ApplicationFiled: July 6, 2012Publication date: January 9, 2014Applicant: POWER SYSTEMS TECHNOLOGIES, LTD.Inventors: Antony Brinlee, Sriram Chandrasekaran, Steven Malechek
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Patent number: 8625310Abstract: A power supply apparatus includes an AC-DC rectifier, a transformer, a feedback inductor, a resonant unit, and a primary and auxiliary switch. The AC-DC rectifier rectifies an input voltage. The transformer includes a primary coil having a first primary coil and an isolated second primary coil, and transforms a first voltage of the primary coil into a second voltage of the secondary coil. The feedback inductor is connected to a tap between the first primary coil and second primary coil and an output of the AC-DC rectifier. The resonance unit is connected in parallel with the secondary coil and is configured to output an output voltage by rectifying the second voltage provided from the secondary coil. The primary switch and secondary switch are connected in parallel between the transformer and AC-DC rectifier.Type: GrantFiled: October 6, 2009Date of Patent: January 7, 2014Assignee: Samsung Display Co., Ltd.Inventor: Hyeon-Yong Jang
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Patent number: 8593836Abstract: A power converter includes a main switch to which a capacitor is connected through a sub-diode. A series connection of a primary coil of a transformer and a sub-switch is connected parallel to the capacitor. A main diode is coupled in series with the main switch. A series connection of a sub-diode and a secondary coil of the transformer is parallel to the main diode. The rate of a rise in voltage across the main switch when turned off is suppressed by the rate of charging of the capacitor. Subsequently, by turning on the sub-switch, the current flowing through the main diode to be delivered to the transformer, thereby causing the current flowing through the main switch when turned on to be decreased by the sub-inductor.Type: GrantFiled: October 19, 2011Date of Patent: November 26, 2013Assignee: Denso CorporationInventor: Kazuhiro Umetani
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Patent number: 8593835Abstract: The present invention relates to an oscillator that is capable of realizing duty balancing. The oscillator determines a switching frequency of a converter converting an input voltage according to a switching operation of switches to generate an output voltage. The oscillator determines a first half cycle of a duty signal determining the switching frequency by using a reference current according to a feedback signal corresponding to the output voltage. The oscillator senses a first half cycle period by using an output of the frequency setting unit, and determines the same period as the first half cycle as a second half cycle of the duty signal after the first half cycle.Type: GrantFiled: September 22, 2011Date of Patent: November 26, 2013Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Hyun-Chul Eom, Sung-Yun Park
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Patent number: 8587291Abstract: A diagnosis device and method of a voltage transformer can include a current transformer disposed at one side of an output port for generating a current variation according to an on/off operation of a power switch element; a first current detector configured to detect a forward direction current from the current transformer; a second current detector configured to detect a reverse direction current from the current transformer; a first voltage transformer configured to transform the forward direction current detected from the first current detector to a forward direction voltage; a second voltage transformer configured to transform the reverse direction current detected from the second current detector to a reverse direction voltage; and a diagnosis portion for comparing the forward direction voltage with the reverse direction voltage to determine whether or not an offset is formed.Type: GrantFiled: December 3, 2010Date of Patent: November 19, 2013Assignee: Hyundai Motor CompanyInventors: Sung Kyu Kim, Jaewon Lee, Tae Hwan Chung, Ki Jong Lee, Jong Kyung Lim
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Patent number: 8587972Abstract: An apparatus and a system include a multiplier circuit for receiving a sensed voltage and current of a of a load resistance coupled to a rectified voltage from a transformer's output whose input is from a DC-to-AC converter being supplied from a DC power generator having an internal resistance. The multiplier outputs a product of the sensed voltage and current. A differentiator circuit outputs a rate of change of the product. An integrator circuit outputs an integrated voltage indicating an accumulative rate of change of the product. A voltage-to-frequency converter circuit generates a voltage waveform having a frequency determined by the integrated voltage. A driver circuit uses the voltage waveform to output a control signal for controlling a frequency of the DC-to-AC power converter where the apparatus substantially matches an input resistance of the transformer to the internal resistance, thereby maximizing power transfer to the load resistance.Type: GrantFiled: January 21, 2011Date of Patent: November 19, 2013Inventor: Qi Deng
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Patent number: 8525428Abstract: A power supply system includes a transformer having a primary winding on its primary side for coupling to a power source and one or more secondary windings on its secondary side. A first control circuit is disposed on the primary side of the transformer for controlling a current flow in the primary winding. A second control circuit disposed on the secondary side of the transformer, and the second control circuit is configured to provide a regulated output voltage. In the power supply system, the first control circuit is configured to generate a control signal for controlling the current flow in the primary winding without using a feedback control signal from the secondary side of the transformer.Type: GrantFiled: January 7, 2011Date of Patent: September 3, 2013Assignee: BCD Semiconductor Manufacturing Co. Ltd.Inventors: Fan Chen, Xin Wu, Chaoqun Sun, Qanqing Wu
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Patent number: 8503198Abstract: Disclosed is a high boost ratio DC converter, wherein the first and second switches are controlled by a control chip and the control chip controls the first and second switches in the following sequence: the first and second switches both conduct; the first switch conducts and the second switch is cut off; the first and second switches both conduct; the first switch is cut off and the second switch conducts thus making a first and second inductors and a first and second clamp capacitors charge to a first and second output capacitors. Then the first and second output capacitors discharge a load. Therefore, the load voltage output from the DC power supply will be boosted owing to the discharged load from the first and second output capacitors. The boost ratio is 4/(1?D).Type: GrantFiled: May 13, 2011Date of Patent: August 6, 2013Assignee: National Tsing Hua UniversityInventors: Ching-Tsai Pan, Chao-Han Lee
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Patent number: 8503193Abstract: Power supplies, power adapters, and related methods are disclosed. One example power supply includes an open loop DC to DC converter having an input for connecting to an input power source and an output for supplying a DC output voltage or current and an enable/disable circuit coupled to the open loop DC to DC converter. The enable/disable circuit is configured to enable and disable the open loop DC to DC converter as a function of the DC output voltage or current. One example method includes determining a DC output voltage or current from an open loop DC to DC converter and enabling and disabling the open loop DC to DC converter as a function of the determined DC output voltage or current.Type: GrantFiled: August 26, 2010Date of Patent: August 6, 2013Assignee: Astec International LimitedInventor: Robert H. Kippley
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Patent number: 8467204Abstract: A high voltage power supply is provided. The high voltage power supply includes an inverter which converts a DC voltage input to the high voltage power supply into a first AC voltage, a transformer including an input winding unit and a plurality of output winding units, wherein the input winding unit receives the first AC voltage from the inverter and the plurality of output winding units generates and outputs a second AC voltage, and a voltage multiplier unit which boosts the second AC voltage output by the transformer and outputs a boosted voltage, and the voltage multiplier unit includes a plurality of voltage multipliers which are connected to each other in series and the plurality of voltage multipliers may be connected to the plurality of output winding units respectively.Type: GrantFiled: November 22, 2010Date of Patent: June 18, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Pankaj Agarwal, Kang-hyun Yi, Sung-jin Choi, Joon-hyun Yang
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Patent number: 8451626Abstract: Methods, systems, and devices are described for both power and control signal transmission through a single coupled inductor. A current driver generates a cyclical current signal on a primary winding of a coupled inductor, to induce a voltage signal at the secondary winding corresponding to the cyclical current signal. A rectifier module is coupled with the secondary winding and configured to rectify the signal induced at the secondary winding. A control timing signal module is coupled with the primary winding and configured to induce voltage pulses on the secondary winding, the induced voltage pulses having an insubstantial impact on the output of the rectifier module. A switching module coupled with the secondary winding is configured to receive the voltage pulses and control a switching signal for a power switch coupled with the output of the rectifier and provide power to a load coupled with the output of the rectifier.Type: GrantFiled: August 3, 2011Date of Patent: May 28, 2013Assignee: Microsemi CorporationInventor: Charles Coleman
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Patent number: 8442128Abstract: A signal transmitting device and a method for transmitting via a signal transmitting device is disclosed. In one embodiment the transmitting device comprises a first resonant circuit with a resonant circuit inductance and a resonant circuit capacitance and a second resonant circuit with a resonant circuit inductance and a resonant circuit capacitance, a coupling element which couples the first resonant circuit to the second resonant circuit, a first excitation circuit, coupled to the first resonant circuit, and at least one further excitation circuit coupled to the second resonant circuit.Type: GrantFiled: March 2, 2007Date of Patent: May 14, 2013Assignee: Infineon Technologies AGInventor: Martin Feldtkeller
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Publication number: 20130069551Abstract: A switching power supply includes a transformer, a resonant capacitor, a pair of switching elements, an inductor, and a rectifying element. The transformer includes a first winding, a second winding, and a third winding. The resonant capacitor is connected to both ends of the first winding. The switching elements are normally-on elements and alternately turned off according to a voltage induced in the third winding. Each of the switching elements includes a first main terminal, a second main terminal, and a control terminal. The inductor supplies a direct-current power supply voltage between the middle point of the first winding and the each first main terminal of the switching elements. The rectifying element rectify a voltage induced in the second winding.Type: ApplicationFiled: August 2, 2012Publication date: March 21, 2013Applicant: TOSHIBA LIGHTING & TECHNOLOGY CORPORATIONInventors: Noriyuki Kitamura, Yuji Takahashi
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Patent number: 8395347Abstract: In an induction motor group control system, magnetic energy recovery switches (3) are connected in series to an induction motor (2) directly driven by a commercial power supply, and a plurality of induction motor control devices (10) enabling voltage control and reactive power control of the induction motor 2 are employed to control generation of reactive power so as to maximize a power factor of the entire plurality of AC loads including the induction motor or compensate variations in voltage of an AC power supply (1).Type: GrantFiled: March 10, 2010Date of Patent: March 12, 2013Inventors: Kazuhiko Fukutani, Hideo Narisawa, Ryuichi Shimada, Takanori Isobe, Tadayuki Kitahara
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Patent number: 8374012Abstract: A phase-controlled power supply is disclosed. The power supply includes a power conditioner with an input configured to connect to an external source of electrical power, the power conditioner being configured to provide conditioned power on its output. The power supply also includes a transformer having a primary winding and a secondary winding, and a switching module coupled between the output of the power conditioner and to the primary winding of the transformer. The switching module has two modes of operation and a control signal input configured to accept a first control signal. The switching module includes a switching element configured to connect the power conditioner output to the primary winding of the transformer. The switching module operates in the first mode when the first control signal is in a first state, switching the first switching element at a first frequency and first duty cycle.Type: GrantFiled: June 10, 2010Date of Patent: February 12, 2013Assignee: CareFusion 303, Inc.Inventors: Mark Raptis, Jeff Gray, Dugan Joyce, Albert Dibelka, Alex Mueggenborg
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Patent number: 8369112Abstract: A DC/DC converter has three half-bridge-type current resonant DC/DC converters that are connected in parallel, have a phase difference of 120 degrees, and are operated at a frequency higher than a resonant frequency. Each of the three half-bridge-type current resonant DC/DC converters includes a transformer having a primary winding, a secondary winding, and a tertiary winding, a series circuit connected to both ends of a DC power source and including first and second switching elements, a series circuit connected to both ends of the first or second switching element and including a resonant reactor, the primary winding of the transformer, and a resonant capacitor, and a rectifying circuit to rectify a voltage generated by the secondary winding and output the rectified voltage to a smoothing capacitor. The tertiary windings are annularly connected to a reactor.Type: GrantFiled: December 9, 2008Date of Patent: February 5, 2013Assignee: Sanken Electric Co., Ltd.Inventor: Mamoru Tsuruya
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Patent number: 8339817Abstract: A method of operating a resonant power converter(1, 2), having a high side switch(3) and a low side switch(4), is disclosed in which the switching is controlled to allow for improved operation at low power levels. The method involved an interruption to the part of the switching cycle in which the low side switch (4) is normally closed, by opening the switch at a particular moment in the cycle which allows the energy to be store in the resonance capacitor (5). Since, as a result, the energy is largely not resonating but stored in a single component, the time quantization of the mode of operation is significantly reduced or eliminated.Type: GrantFiled: February 3, 2009Date of Patent: December 25, 2012Assignee: NXP B.V.Inventor: Hans Halberstadt
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Patent number: 8331114Abstract: A dual-switch flyback power converter includes a control circuit to generate a switching signal. A high-side driving circuit includes a pulse generation circuit. The pulse generation circuit generates a pulse-on signal and a pulse-off signal to control two transistors in response to the switching signal. The two transistors further respectively provide a level-shift-on signal and a level-shift-off signal to a comparison circuit to enable/disable a high-side driving signal. Without using a charge pump circuit to power the high-side driving circuit, a floating winding of a transformer is utilized to provide a floating voltage to power the high-side driving circuit, which reduces the cost of the dual-switch flyback power converter and ensures a sufficient high-side driving capability of the high-side driving circuit.Type: GrantFiled: November 18, 2009Date of Patent: December 11, 2012Assignee: System General CorporationInventors: Ta-Yung Yang, Shih-Jen Yang, Ming-Hsuan Lee, Jian Chang
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Patent number: 8331113Abstract: The invention discloses a control circuit for an AC-DC converter. The control circuit includes a power control circuit for comparing an input current sensing signal generated by sensing an input current of the AC-DC converter and a power level control input and in response thereto generating a frequency modulation control signal, in which the frequency modulation control signal is used to control the output power of the AC-DC converter and suppress harmonics of the input current, and a square wave generator connected to the power control circuit for generating a driving signal used to drive the switch circuit of the AC-DC converter according to the frequency modulation control signal, in which the frequency of the driving signal is varied with the frequency modulation control signal, thereby suppressing harmonics of the input current and regulating the switching frequency the AC-DC converter, and regulating the output power of the AC-DC converter.Type: GrantFiled: January 31, 2011Date of Patent: December 11, 2012Assignee: Delta Electronics, Inc.Inventors: Pak-Chuen Tang, Kwong-Ming Ching, Chung-Hei Poon
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Patent number: 8319376Abstract: A driving circuit drives a switching element such that an ON-period of the switching element is shorter when a power receiving device is detected not to be placed than when the power receiving device is placed.Type: GrantFiled: December 8, 2009Date of Patent: November 27, 2012Assignee: Panasonic CorporationInventors: Hiroyasu Kitamura, Kyohei Kada
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Publication number: 20120250369Abstract: An isolated power conversion apparatus has an isolation transformer, a series circuit including a load and an inductor connected in series with each other, the series circuit being disposed on a secondary side of the isolation transformer, and one or a plurality of switching means disposed between the series circuit and the secondary side of the isolation transformer, the switching means being bidirectional. This apparatus sends out power from a DC power supply of a primary side of the isolation transformer toward the load as DC power or AC power of an arbitrary polarity, or regenerates and supplies the DC power or AC power from the load to the DC power supply.Type: ApplicationFiled: March 19, 2012Publication date: October 4, 2012Applicant: NF CORPORATIONInventor: Osamu Furukawa
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Patent number: 8279637Abstract: In order to further develop a circuit arrangement (100) as well as a method for generating at least one drive signal for at least one synchronous rectification switch of at least one flyback converter in such way that an improved and simpler thermal management can be combined with a significant cost reduction as well as with a higher efficiency, it is proposed to generate the drive signal for said synchronous rectification switch as a function of at least one oscillating signal controlling the synchronous rectification switch, of at least one constant delay time, of at least one variable delay time, and of at least one Boolean OR function.Type: GrantFiled: May 25, 2007Date of Patent: October 2, 2012Assignee: Koninklijke Philips Electronics N.V.Inventor: Ulrich Boeke
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Patent number: 8229600Abstract: To provide a flow controlling device capable of providing an accurate flow set by a setting device without mutual interference between flow controlling devices.Type: GrantFiled: March 23, 2009Date of Patent: July 24, 2012Assignee: Azbil CorporationInventors: Osamu Momose, Toshiya Arai