Having Current Protection (e.g., Over Current, Short, Etc.) Patents (Class 363/56.03)
  • Patent number: 10516257
    Abstract: A voltage source converter based DC deicer and its control method are provided. The voltage source converter based DC deicer includes a connecting reactor, a modular multilevel voltage source converter based on a full H-bridge submodule, smoothing reactors, deicing disconnectors, a deicing bus, and a deicing AC line. The AC side of the modular multilevel voltage source converter is connected to an AC side bus through the connecting reactor, an isolation disconnector and a breaker. The DC side of the modular multilevel voltage source converter is connected to the deicing AC line through the smoothing reactors, the deicing disconnectors, and the deicing bus.
    Type: Grant
    Filed: November 16, 2015
    Date of Patent: December 24, 2019
    Assignee: CHINA SOUTHERN POWER GRID TECHNOLOGY RESEARCH INSTITUTE CO., LTD.
    Inventors: Chuang Fu, Hong Rao, Juanjuan Wang, Shukai Xu
  • Patent number: 10454366
    Abstract: A current sensorless control system and a control method thereof for single stage isolated PFC converters based on DAB. By coordinating three control variables of the DAB converter, that is, the inside phase-shifting ratio of the primary side full-bridge, the inside phase-shifting ratio of the secondary side full-bridge, and the phase-shifting ratio between the primary and the secondary sides, the present invention does not need to design additional current controller for the control of the input current, and may make the input current sinusoidal by directly coordinating the output voltage controller, the input voltage and the current modulation step, thereby reducing system cost and the difficulty of controller design, enhancing the stability of the control system, and improving the dynamic performance.
    Type: Grant
    Filed: January 4, 2019
    Date of Patent: October 22, 2019
    Assignee: Shanghai Jiao Tong University
    Inventors: Guojie Li, Anping Tong, Lijun Hang, Jingzhou Xu
  • Patent number: 10250417
    Abstract: One feature pertains to an apparatus that includes a first stage track and hold circuit that subsamples a receive equalizer output of a receive equalizer, and a second stage track and hold circuit that generates a first signal representative of an average voltage value of a logical value at the receive equalizer output when a high frequency bit pattern is detected, and a second signal representative of an average voltage value of the logical value at the receive equalizer output when a steady state bit pattern is detected. The apparatus further includes a comparator circuit that generates a comparator output signal that indicates which of the first signal and the second signal has a greater magnitude, and a processing circuit that generates equalizer tuning signals based on the comparator output signal to adjust parameters of an equalizer that affects the receive equalizer output.
    Type: Grant
    Filed: April 9, 2018
    Date of Patent: April 2, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Bo Sun, Daniel Butterfield
  • Patent number: 10177650
    Abstract: Various methods and devices that involve snubber circuits for switching power converters are disclosed. An example power converter has a snubbing circuit. The snubber circuit comprises a bypass capacitor connecting an input node of the power converter to a ground node of the power converter, a decoupling capacitor that connects the input node of the power converter to a snubber node, and a snubbing resistor that connects the snubber node to the ground node. The snubbing resistor connects the decoupling capacitor to the ground node of the power converter. The snubbing resistor is greater than 1 ohm. The decoupling capacitor is greater than 5 nanofarads and less than 0.5 microfarads. The bypass capacitor is greater than 1 microfarads.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: January 8, 2019
    Assignee: Silanna Asia Pte Ltd
    Inventor: Marshall Stanley
  • Patent number: 10116296
    Abstract: An electronic device has a power semiconductor device, a first semiconductor integrated circuit device, and a second semiconductor integrated circuit device. The power semiconductor device has a terminal outputting sense current. The first semiconductor integrated circuit device has an overcurrent detection circuit detecting overcurrent on the basis of the sense current, and a temperature detection circuit detecting temperature of the power semiconductor device. The second semiconductor integrated circuit device has a storage device storing a temperature characteristic of a current mirror ratio of the power semiconductor device, a temperature detecting unit calculating temperature on the basis of an output of the temperature detection circuit, and an overcurrent detection control unit controlling the overcurrent detection circuit on the basis of the temperature detected by the temperature detecting unit and the temperature characteristic of the current mirror ratio stored in the storage device.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: October 30, 2018
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Makoto Tsurumaru, Kenta Sadakata
  • Patent number: 10097107
    Abstract: A method for operating an inverter, the DC voltage input of which is connected to a positive pole (PV+) and to a negative pole (PV?) of a PV generator and the AC voltage output of which is connected to an AC grid via a transformer, is disclosed. The method includes determining a potential of the positive pole and/or the negative pole (UPV+, UPV?) of the PV generator with respect to a ground potential by a monitoring circuit, and selecting a modulation method for controlling power switches of the inverter from a number of modulation methods stored in a storage device of the inverter based on the determined potential (UPV+, UPV?) such that a voltage stress on components of the PV system arranged on the AC side, with respect to ground, is reduced. The method further includes using the selected modulation method to control the power switches for the purpose of converting a DC input voltage into an AC output voltage.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: October 9, 2018
    Assignee: SMA Solar Technology AG
    Inventors: Josef Petschenka-Rininsland, Cornelius Fuetterer
  • Patent number: 10027253
    Abstract: In the field of high voltage direct current power transmission networks, a voltage source converter comprises first and second DC terminals for connection to a DC electrical network, and a plurality of single-phase limbs. Each single-phase limb includes a phase element, and each phase element includes at least one switching element configured to interconnect a DC voltage and an AC voltage. An AC side of each phase element is connectable to a respective phase of a multi-phase AC electrical network, and each single-phase limb is connected between the first and second DC terminals. The voltage source converter further comprises a controller configured to determine independently of one another an amount of active power (Pref) that the voltage source converter should exchange with the AC electrical network and an amount of reactive power (Qref) that the voltage source converter should exchange with the AC electrical network.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: July 17, 2018
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventor: Omar Fadhel Jasim
  • Patent number: 9825574
    Abstract: A chiller system (200) includes a motor (212), a motor controller (214) connected to the motor (212), the motor controller (214) operative to send a control signal to the motor (212), a rectifier (206) connected to an alternating current (AC) power source (204), the rectifier (206) operative to receive AC power and output direct current (DC) power, a DC bus (208) connected to the rectifier (206), a first inverter (210) connected to the DC bus (208) and the motor (212), the first inverter (210) operative to receive DC power from the DC bus (208) and output AC power to the motor (212), and a second inverter (213) connected to the DC bus (208) operative to receive DC power and output AC power to the motor controller (214).
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: November 21, 2017
    Assignee: CARRIER CORPORATION
    Inventor: Tathagata De
  • Patent number: 9660476
    Abstract: A circuit assembly for discharging an electrical energy store includes a first discharge current path for uncontrolled, passive discharging of the energy store and for keeping a defined charge voltage of the energy store, and a second discharge current path for controlled, active discharging of the energy store. A semiconductor switch electrically connects to a positive current connection of the energy store and to a negative current connection of the energy store. A voltage limiter includes a first current connection for electrically connecting to the positive current connection of the energy store and a second current connection for electrically connecting to the negative current connection of the energy store. The circuit assembly further includes a first control path for providing a first control signal from the first current connection of the voltage limiter to the control connection of the semiconductor switch in order to control the semiconductor switch.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: May 23, 2017
    Assignee: CONTI TEMIC MICROELECTRONIC GMBH
    Inventors: Stefan Flock, Uwe Krella, Olga Siwak
  • Patent number: 9634553
    Abstract: The invention relates to a control device (12) for actuating a pulse-controlled converter of an electric drive system, having: an open-loop/closed-loop control circuit (12a) which is configured to generate pulse-width-modulated actuation signals for switching devices of the pulse-controlled converter; a fault logic circuit (12b) which can detect fault states in the drive system and which is configured to select a switching state or a sequence of switching states for the switching devices of the pulse-controlled converter which are assigned to the corresponding fault state; and a protection circuit (12c) which is embodied in hardware and which comprises a signal delay device (15), which is configured to delay the actuation signals in order to implement a minimum protection time, and a locking device (16a, 16b) which is configured to lock two complementary switching devices of a bridge branch of the pulse-controlled converter with respect to one another.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: April 25, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Julia Roessler, Martin Trunk, Andreas Schoenknecht, Tim Bruckhaus
  • Patent number: 9509209
    Abstract: An inverter for driving a motor generator has series connection units, each of which has two switching elements, connected in series, in high and low voltage sides, respectively. A drive unit is arranged for each switching element. A gate of the switching element is connected to an emitter thereof through a first cutoff resistance and a first cutoff switching element in the drive unit. The gate of the switching element is also connected to the emitter thereof through a second cutoff resistance and a second cutoff switching element in the drive unit. A resistance value of the first cutoff resistance is higher than a resistance value of the second cutoff resistance. A software cutoff process is performed when the switching element is in a completely turned-on state so that the first cutoff switching element is turned on and the second cutoff switching element is turned off.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: November 29, 2016
    Assignee: Denso Corporation
    Inventors: Tomotaka Suzuki, Yoshiyuki Hamanaka
  • Patent number: 9419548
    Abstract: The invention refers to a method for controlling a brushless, electronically commutated electric motor, a main AC voltage being rectified into an intermediate circuit direct voltage and this direct voltage being fed by an intermediate circuit containing an intermediate circuit capacitor to an inverter which is controlled by a motor control means for feeding and commutating the electric motor whereby the intermediate circuit direct voltage is monitored in respect of its voltage level and is compared with a predetermined limiting value and, on reaching or exceeding the limiting value, the intermediate circuit direct voltage is limited to the predetermined limiting value by clocked disconnection and reconnection.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: August 16, 2016
    Assignee: ebm-papst Mulfingen GmbH & Co. KG
    Inventors: Daniel Konig, Thomas Brand
  • Patent number: 9368960
    Abstract: A converter valve unit including a plurality of parallel connected controllable semiconducting elements. A free-wheeling diode is connected in anti-parallel with each semiconducting element. A control unit is configured to control each semiconducting element. A current sensor is connected to each of the parallel connected semiconducting elements. The current sensor is configured to sense a current of each semiconducting element by measuring a voltage over the current sensor. A differentiator is configured to compare the currents of the semiconducting elements by comparing the voltages. Upon detecting an unbalance in the currents the differentiator sends a turn-on signal to all control units to control all the semiconducting elements of the valve unit into a conducting stage.
    Type: Grant
    Filed: April 21, 2014
    Date of Patent: June 14, 2016
    Assignee: ABB RESEARCH LTD.
    Inventor: Hans Peter Nee
  • Patent number: 9351351
    Abstract: The invention relates to an LED converter for operating a load comprising at least one LED series that includes at least one LED, preferably multiple LEDs. On the primary side, the LED converter comprises a resonant converter supplied with a direct current voltage. The resonant converter has a half-bridge that is constructed of two reciprocally clocked switches and that provides a supply voltage for the LED series through a serial/parallel resonance circuit connected to the midpoint of said half-bridge. To regulate the power transferred by the LED converter to the LED series as a feedback factor in each switch-on cycle, a control unit is designed to directly or indirectly determine a peak value of the feedback factor through the lower-potential switch of the half-bridge and to adjust the clocking of the half-bridge, i.e. the frequency and/or the duty factor, as a control factor.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: May 24, 2016
    Assignee: TRIDONIC GMBH & CO KG
    Inventor: Eduardo Pereira
  • Patent number: 9214873
    Abstract: A method for operating an electrical power rectifier. The power rectifier comprises at least two branches that are connected in parallel to each other, each of the branches comprising at least two power semiconductor elements that are connected in series. The collector-emitter voltage Vce(t) and/or the collector current Ic(t) of one of the power semiconductor elements is detected by means of the method. Furthermore, it is determined whether at least one of the following conditions is met: dVce(t)/dt<(dVce/dt)crit, and/or dIc(t)/dt<(dIc/dt)crit, and or Ic(t_ent)<Iccrit. If at least one of the aforementioned conditions has been met, the gate-emitter voltage of at least one of the power semiconductor elements is increased.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: December 15, 2015
    Assignee: GE Energy Power Conversion GmbH
    Inventors: Roland Jakob, Piotr Sadowski, Thomas Bruckner, Thomas Basler
  • Patent number: 9190834
    Abstract: The invention relates to a method for operating an inverter (1), in particular a pulse-controlled inverter, comprising multiple phase systems (2, 3, 4), each of which has an outer conductor (7, 8, 9) and at least one semiconductor component (12, 13), and a temperature monitoring device (15) that has multiple temperature sensors (16, 17, 18) which sense the temperature of at least one part of at least one of the phase systems (2, 3, 4). In said method, a temperature gradient is determined from each of the sensed temperatures, the difference of the determined temperature gradients from each other is ascertained, and if the difference exceeds at least one threshold value, a fault of a cooling device of the inverter (1) is identified. The invention further relates to an inverter (1).
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: November 17, 2015
    Assignee: Robert Bosch GmbH
    Inventor: Miguel Casares
  • Patent number: 9106155
    Abstract: A three-level power conversion circuit includes a plurality of one-phase switch circuits which receive power from direct current power supplies that are connected in series. Each of the one-phase switch circuits includes a semiconductor switch series circuit that is connected in parallel to the direct current power supplies, and also a bidirectional switch and a circuit-opening device that are connected in series between a series connection point of the semiconductor switch series circuit and a series connection point of the direct current power supplies. If a semiconductor element in a bidirectional switch fails, the circuit opening device opens a path along which the main current of the semiconductor element flows, and operation of the inverter is continued as a two-level inverter with the remaining bidirectional switches in a constant off-state.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: August 11, 2015
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Satoki Takizawa
  • Publication number: 20150069937
    Abstract: A semiconductor device includes a control section, a first arm, and a second arm; and has an H-bridge circuit to supply an input current supplied from a power source to an output terminal as a reversible electric current on the basis of a control signal outputted from the control section and a reverse-connection-time backflow prevention circuit to prevent an electric current in a direction opposite to the direction of the input current from being supplied to the H-bridge circuit. The first arm is formed over a first island. The second arm is formed over a second island. The control section and the reverse-connection-time backflow prevention circuit are formed over a third island.
    Type: Application
    Filed: November 17, 2014
    Publication date: March 12, 2015
    Applicant: Renesas Electronics Corporation
    Inventor: Kenji AMADA
  • Patent number: 8976545
    Abstract: A current resonance power supply includes a current detecting unit detecting a current flowing through a primary side of a transformer and a current compensating unit compensating the current detected by the current detecting unit in accordance with a variation in voltage input into the primary side of the transformer. The current resonance power supply detects overcurrent on the basis of an output from the current compensating unit.
    Type: Grant
    Filed: April 12, 2011
    Date of Patent: March 10, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keisuke Samejima, Takayuki Fukutani
  • Publication number: 20150043246
    Abstract: A no load detection and shutdown circuit in an isolated driver is provided. A no load condition is detected by primary side evaluation of a reflected voltage. If a determination is made that a no load condition is present, the no load detection circuit signals a half bridge driver of the driver to cease oscillations, shutting down the driver.
    Type: Application
    Filed: June 24, 2014
    Publication date: February 12, 2015
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Nitin Kumar, Markus Ziegler
  • Publication number: 20150023076
    Abstract: A power converter control device includes an alarm signal generation circuit which detects information necessary for a protection operation of a semiconductor element configuring a power converter, and generates and externally outputs an alarm signal with a pulse width responding to a protection factor; a temperature signal generation circuit which detects a temperature of the semiconductor element, and generates a PWM signal, correlated with the temperature, the cycle of which is different from the pulse width of the alarm signal; and an output control circuit which selects the PWM signal in normal time, and selects and externally outputs the alarm signal in place of the PWM signal when the alarm signal is generated.
    Type: Application
    Filed: October 6, 2014
    Publication date: January 22, 2015
    Inventors: Akira NAKAMORI, Satoru MOTOHASHI
  • Publication number: 20150023075
    Abstract: An apparatus and method for controlling an operation of an inverter are provided. In the inverter control apparatus, an operation signal input unit detects a current of each phase output from an inverter. An error detecting unit detects whether there is a fault of the inverter on the basis of the current detected by the operation signal input unit. A controller controls driving of the inverter according to a type of the fault detected by the error detecting unit. A storage unit stores a kind of fault of the inverter and a corresponding fault type on the basis of the current detected in the operation signal detecting unit.
    Type: Application
    Filed: May 23, 2014
    Publication date: January 22, 2015
    Applicant: LSIS CO., LTD.
    Inventor: Kwang Woon KIM
  • Publication number: 20150009730
    Abstract: The control of an inductive load is implemented by a control strategy to generate a control signal for a switching element on the basis of a setpoint datum, with a mechanism defining a maximum permitted value (Imax) of the current in the load as a function of the temperature at the level of the switching element. The mechanism exhibits a temperature threshold (Tshd). The maximum permitted value (Imax) of the current is held constant, equal to an upper limit value (Isup), during a temperature climb phase for all the temperatures which are lower than the threshold. The maximum permitted value of the current is abruptly rendered equal to a lower limit value (Iinf) as soon as the temperature reaches the threshold. Finally, during a temperature descent phase, the maximum permitted value of the current gradually climbs back to the upper limit value as the temperature decreases.
    Type: Application
    Filed: December 17, 2012
    Publication date: January 8, 2015
    Applicants: CONTINENTAL AUTOMOTIVE GMBH, CONTINENTAL AUTOMOTIVE FRANCE
    Inventor: Angelo Pasqualetto
  • Patent number: 8878460
    Abstract: A protection circuit of a DC-DC converter is disclosed. An input terminal of the DC-DC converter receives an input voltage and an output terminal of the DC-DC converter provides an output voltage. The DC-DC converter includes an output stage between the input terminal and the output terminal. The protection circuit includes a current sensor, a comparator, a determining circuit, and a protection control circuit. The current sensor provides a sensing signal. The comparator compares a default over-voltage with the sensing signal to provide an over-current control signal. The determining circuit provides a determining control signal. The protection control circuit determines whether to enable a short protection according to the over-current control signal and the determining control signal.
    Type: Grant
    Filed: January 15, 2014
    Date of Patent: November 4, 2014
    Assignee: UPI Semiconductor Corporation
    Inventor: Wen-Fu Lu
  • Patent number: 8873257
    Abstract: A control circuit performs at least one of detecting whether the resonance current detected by the current detection unit is beyond a first detection level over a predetermined time period, and detecting, when detecting that the resonance current is beyond the first detection level over the predetermined time period, that the resonance current falls below a second detection level, and detecting whether the resonance current detected by the current detection unit is below a first detection level over a predetermined time period, and detecting, when detecting that the resonance current is below the first detection level over the predetermined time period, that the resonance current exceeds a second detection level, and inverts, when detecting that the resonance current falls below or exceeds the second detection level, the levels of the drive control signal at which the first switching element and the second switching element are turned on or off.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: October 28, 2014
    Assignee: Sony Corporation
    Inventor: Tomonori Tsuchiyama
  • Patent number: 8810189
    Abstract: Example embodiments disclose a drive system including a machine including a plurality of phases and configured to generate power based on a plurality of phase currents, each respectively associated with the plurality of phases and a direct current (DC) bus, operatively connected to the machine. The DC bus includes a high-side line, a low-side line, and an inverter including a plurality of switching systems, operatively connected between the high-side line and the low-side line, the plurality of switching systems, each configured to output a respective one of the plurality of phase currents. The drive system also includes a controller, operatively connected to the DC bus and the machine, the controller configured to determine if a failure exists in the drive system based on the plurality of phase currents and a DC bus voltage, the DC bus voltage being a voltage across the high-side line and the low-side line.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: August 19, 2014
    Assignee: Deere & Company
    Inventors: Brij N. Singh, Chris J. Tremel, Alan K. Gilman
  • Patent number: 8781637
    Abstract: A power distribution system (that can detect an unsafe fault condition where an individual or object has come in contact with the power conductors) regulates the transfer of energy from a source to a load. Periodically, the source controller opens an S1 disconnect switch, a and load controller opens an S2 disconnect switch. A capacitor represents the capacitance across the load terminals. If the capacitor discharges at a rate higher or lower than predetermined values after the S1 and S2 disconnect switches are opened, then a fault condition is registered, and the S1 and S2 switches will not be commanded to return to a closed position, thus isolating the fault from both the source and the load.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: July 15, 2014
    Assignee: VoltServer Inc.
    Inventor: Stephen S. Eaves
  • Patent number: 8779929
    Abstract: A semiconductor element drive device which individually drives semiconductor elements configuring a power converter includes plural protection circuits which detect information necessary for carrying out a protection operation for the semiconductor elements, an alarm signal output circuit which, having set therein pulse signals with pulse widths differing from one of the plural protection circuits to another, continuously outputs a pulse signal corresponding to a protection circuit, among the plural protection circuits, which has first detected that a protection operation is necessary, as an alarm signal during a period in which it is detected that the protection operation is necessary, and a notification signal output circuit which, when the alarm signal is output from the alarm signal output circuit, outputs one pulse thereof equivalent to the set pulse width as a protection operation notification signal.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: July 15, 2014
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Sachiaki Komatsu, Satoru Motohashi
  • Patent number: 8767423
    Abstract: A power supply controller includes an input voltage sense input and an output voltage sense input coupled to sense an input voltage and an output voltage of a power supply. A current limit circuit includes a first variable resistance coupled in parallel with a second variable resistance. The first variable resistance responsive the input voltage of the power supply and the second variable resistance is responsive to the output voltage of the power supply. The current limit circuit is coupled to generate a current limit signal in response to an equivalent resistance of the first variable resistance coupled in parallel with the second variable resistance. A drive signal generator is coupled to generate a drive signal in response to the current limit signal to drive a power switch of the power supply to limit an output power of the power supply in response to the input voltage.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: July 1, 2014
    Assignee: Power Integrations, Inc.
    Inventor: William M. Polivka
  • Publication number: 20140177298
    Abstract: This device protects at least one electronic switching branch of an electrical conversion system against an overcurrent, each branch comprising two switching half-branches serially connected at an intermediate terminal, at least one half-branch including a switching member, each switching member comprising a first controllable switch and a diode connected in antiparallel to said first switch. The protection device includes, for each switching branch, at least one second controllable switch, each second switch being connected to the intermediate terminal or to an electrode of said diode in antiparallel to the first switch, each second switch being able to switch, under action of a controller, from an on state to an off state to protect said diode from the overcurrent, means for measuring a magnitude relative to a current able to circulate in each diode, and means for controlling each second switch, based on the measured magnitude.
    Type: Application
    Filed: December 16, 2013
    Publication date: June 26, 2014
    Applicant: SCHNEIDER ELECTRIC INDUSTRIES SAS
    Inventors: Bruno REYMOND, Maria Vallet
  • Patent number: 8730700
    Abstract: In controlling switching elements of a current source inverter, a switching loss in the switching element is prevented according to a normal switching operation for a commutation operation, without requiring any particular control. In the commutation operation of the current source inverter, a timing for driving the switching elements is controlled in such a manner that an overlap period is generated, during when both a switching element at the commutation source and a switching element at the commutation target are set to be the ON state, a resonant circuit is controlled based on the control of the switching elements having this overlap period, and resonant current of the resonant circuit reduces the switching loss upon commutation operation of the switching elements.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: May 20, 2014
    Assignee: Kyosan Electric Mfg. Co., Ltd.
    Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Shinichi Kodama
  • Patent number: 8700093
    Abstract: A wireless communication system base station (20) includes a base station transceiver (26) that has at least one operative component (32) for facilitating wireless communications. A current limiting device (36) includes at least one field effect transistor for selectively controlling current flow to a capacitive stability device (34) associated with at least one of the operative components (32). In the disclosed example, the current limiting device (36) is in series with the capacitive stability device (34) but in parallel with the operative component (32).
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: April 15, 2014
    Assignee: 8631654 Canada Inc.
    Inventor: Igor Golioto
  • Publication number: 20140092655
    Abstract: A power converter includes an inverter unit that includes a plurality of semiconductor switching elements constituting upper and lower arms and converts DC power into AC power; a gate driving unit that outputs, to the inverter unit, a gate signal used to drive gates of the plurality of semiconductor switching elements; a driving control unit that supplies the gate driving unit with a switching control signal used for the gate driving unit to output the gate signal; a first abnormality detection unit that performs over voltage detection of the DC power and over current detection of the AC power and temperature detection of the upper and lower arms; and a second abnormality detection unit that detects abnormality of the plurality of semiconductor switching elements of the upper arm and lower arms, wherein the driving control unit includes a first protection circuit and a second protection circuit.
    Type: Application
    Filed: December 7, 2010
    Publication date: April 3, 2014
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Hiroaki Igarashi, Satoru Shigeta, Takashi Ogura
  • Patent number: 8681516
    Abstract: An inverter has a current sensor that senses a low side current before a high side of the inverter is permitted to power up. If an over-current situation is detected on the low side, powering up is prevented in order to avoid damage to the rectifier.
    Type: Grant
    Filed: July 4, 2008
    Date of Patent: March 25, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventor: Richard Kenney
  • Patent number: 8659920
    Abstract: A switching device includes a flowing restriction element, a conductor and a snubber resistor. The flowing restriction element has an opening and closing function to open and close a flowing path of an electric current. The conductor is connected to the flowing restriction element. The snubber resistor is connected to the flowing restriction element and constitutes a snubber circuit. The snubber resistor is disposed along the conductor.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: February 25, 2014
    Assignee: DENSO CORPORATION
    Inventors: Nobuhisa Yamaguchi, Yasuyuki Sakai
  • Patent number: 8644038
    Abstract: A current detection circuit for a power semiconductor device utilizes a sense function of the power semiconductor device. The magnitude of current flowing in power semiconductor devices 1, 11 is detected by a current-voltage conversion circuit 24 connected to sense terminals S, S of the power semiconductor devices. The detected signal is delivered to a current direction detection circuit 27, which detects the direction of the current and delivers the detected current direction signal to an external CPU 3, which in turn gives gain-setting and offset-setting signals corresponding to the current direction signal. An output gain adjuster 221 adjusts the magnitude of gain and an output offset adjuster 231 adjusts the magnitude of offset to correct for differences between the characteristics of the sense regions and the main regions of the power semiconductor devices.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: February 4, 2014
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Masahiro Sasaki
  • Patent number: 8630103
    Abstract: A power converter controller is disclosed. An example controller includes a control circuit coupled to receive a feedback signal representative of an output of the power converter. The control circuit coupled to control a switching of a power switch of the power converter in response to the feedback signal to control a transfer of energy from an input of the power converter to the output of the power converter. An internal programming interface circuit is coupled to the control circuit. A coupling switcher is coupled to the internal programming interface circuit. An external programming terminal is selectively coupled to the internal programming interface circuit through the coupling switcher. An external programming circuit coupled to the external programming terminal is coupled to the internal programming interface circuit through the coupling switcher during a startup programming condition and during a fault condition of the power converter.
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: January 14, 2014
    Assignee: Power Integrations, Inc.
    Inventors: Stefan Bäurle, Guangchao Darson Zhang, Mingming Mao
  • Publication number: 20140003103
    Abstract: An inverter includes a multilevel bridge circuit. A control circuit is operatively coupled to the multilevel bridge circuit and configured to detect an overcurrent for an output of the inverter, to generate a measure of a duration of the overcurrent and to selectively put an output of the bridge circuit in a first impedance state or a second impedance state based on the measure. The first and second impedance states may provide respective first and second impedances between the bridge circuit output and a neutral.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 2, 2014
    Inventor: Tuomas Esko Aaltio
  • Patent number: 8605471
    Abstract: A power conversion device includes: an inverter that converts a DC current supplied from a DC power source to an AC current by engaging a plurality of switching elements, which constitute an upper arm, and a plurality of switching elements, which constitute a lower arm, in switching operation; a control unit that includes a signal generation unit that generates a switching signal carrying a command for execution of the switching operation in correspondence to each of the plurality of switching elements constituting the upper arm and the plurality of switching elements constituting the lower arm, and outputs the switching signal thus generated as a control signal; and a drive unit that individually drives each of the switching elements based upon the corresponding control signals.
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: December 10, 2013
    Assignee: Hitachi Automotive System, Ltd.
    Inventors: Takashi Ogura, Satoru Shigeta, Hiroaki Igarashi, Koichi Ono, Yasuo Noto
  • Patent number: 8599585
    Abstract: According to one embodiment, an electronic device includes a positive electrode, a negative electrode, a first terminal, a second terminal, a first plurality of switching elements and anti-parallel diodes coupled between the positive electrode and the first terminal and the second terminal, a second plurality of switching elements and anti-parallel diodes coupled between the negative electrode and the first terminal and the second terminal and a PiN diode coupled between the positive electrode and the negative electrode with reverse polarity.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: December 3, 2013
    Assignee: Toshiba Corporation
    Inventors: Ikuo Yasuoka, Shinichi Toda, Mitsuhiro Numazaki, Yosuke Nakazawa, Makoto Takeda, Takahiko Minami, Takashi Takagi
  • Patent number: 8575885
    Abstract: To make it possible to avoid an unstable state with a simple configuration even one of the phases of the motor fails. A motor drive system in accordance with the present invention includes a motor to which a plurality of phase coils of five phases or more are connected in a star connection, an inverter connected to one end of each of the phase coils, the inverter being configured to convert a DC power into an AC power and supply the AC power to each phase of the motor, a power relay disposed at another end of each of the phase coils, the power relay being configured so as to be able to cut off a supply power to at least one phase coil among the plurality of phase coils of the motor by using a plurality of contact points interposed between the star-connected coils, and a control unit that generates a control signal for the inverter and thereby controls driving of the motor.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: November 5, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Yoshihiro Okumatsu
  • Patent number: 8559152
    Abstract: System and method for protecting a power converter. The system includes a duty-cycle detection component configured to receive a modulation signal, determine a first duty cycle corresponding to a first period of the modulation signal, compare the first duty cycle with a threshold duty cycle, and generate a duty-cycle comparison signal. Additionally, the system includes a threshold generator configured to receive the duty-cycle comparison signal and generate a threshold signal corresponding to a second period of the modulation signal, the second period being after the first period, and a comparator configured to receive the threshold signal and a first signal and to generate a first comparison signal. The first signal is associated with an input current for a power converter. Moreover, the system includes a pulse-width-modulation component configured to receive the first comparison signal and generate the modulation signal for adjusting the input current for the power converter.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: October 15, 2013
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Yaming Cao, Jinya Dong, Yunchao Zhang, Lieyi Fang
  • Patent number: 8531168
    Abstract: An electronic device for DC-DC conversion of an input voltage into an output voltage is provided. The electronic device includes a current mode control loop for controlling a sensed current of the DC-DC conversion by comparing a voltage level indicating a magnitude of the sensed current with a reference voltage level indicating the maximum admissible magnitude of the sensed current. The reference voltage level is dynamically adjusted in response to a change of an input voltage level.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: September 10, 2013
    Assignee: Texas Instruments Deutschland GmbH
    Inventors: Franz Prexl, Juergen Neuhaeusler
  • Patent number: 8520415
    Abstract: Some of the embodiments of the present disclosure provide an apparatus comprising a voltage sensor circuit configured to generate a voltage feedback signal indicative of an output voltage of the apparatus, a current sensor circuit configured to generate a current feedback signal indicative of a load current of the apparatus, a converter configured to receive the current feedback signal, and generate a fault signal that is indicative of a fault condition associated with the load current, and an optocoupler configured to receive the voltage feedback signal and the fault signal, and generate a feedback signal that is indicative of the output voltage and indicative of the fault condition. Other embodiments are also described and claimed.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: August 27, 2013
    Assignee: Marvell International Ltd.
    Inventors: Ravishanker Krishnamoorthy, Hong Liang Zhang, Wanfeng Zhang
  • Patent number: 8508957
    Abstract: A power conversion device includes an inverter for converting DC power to AC power to supply the AC power to a load, a converter for converting AC power from an AC power supply to DC power to supply the DC power to the inverter, a DC voltage converter for converting a voltage value of power stored in a storage battery to supply DC power from the storage battery to the inverter when power supply by the AC power supply is abnormal, and a filter which includes a reactor and a capacitor and removes harmonics generated by the inverter. The inverter includes a three-level circuit constituted of an arm and an AC switch.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: August 13, 2013
    Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation
    Inventors: Kazuhide Eduardo Sato, Masahiro Kinoshita, Yushin Yamamoto, Tatsuaki Amboh
  • Patent number: 8503195
    Abstract: An open loop half-bridge power converter is provided for effective zero volt switching during all operating conditions, the converter including: an oscillating inverter circuit having a pair of switches coupled to a load circuit; an inverter drive circuit effective to provide driver signals to the inverter circuit; and a control circuit for providing control signals to the drive circuit. The control circuit is configured to increase a switching frequency of the switching devices in response to a predetermined condition such as startup or short circuit conditions. The inverter as a result continues to operate at a full duty cycle in response to the increased switching frequency, and zero volt switching is ensured throughout the duration of the predetermined condition.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: August 6, 2013
    Assignee: Power-One, Inc.
    Inventor: Igor Mogilevski
  • Patent number: 8503202
    Abstract: Voltage source converter based on a chain-link cell topology including one or more phases, each of the phases having one or more series-connected chain-link cell modules connected to each other. The output voltage of the voltage source converter is controlled by control signals applied to the series-connected chain-link cell modules. In case of failure of a chain-link cell module, that module is controlled, by the control signals, such that zero output voltage is provided at its output voltage AC terminal.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: August 6, 2013
    Assignee: ABB Technology AG
    Inventors: Filippo Chimento, Frans Dijkhuizen, Jean-Philippe Hasler, Falah Hosini, Tomas Jonsson, Peter Lundberg, Mauro Monge, Staffan Norrga, Jan R. Svensson, Fredrik Tinglow
  • Patent number: 8427846
    Abstract: A three-phase inverter circuit includes an inverter incorporating a plurality of controllable power switches, and an electronic control device adapted to control the power switches. The control device in the event of a measured voltage drop on one phase is adapted to supply a reactive current on the phase with voltage drop and to supply and/or draw an active current on at least one phase without voltage drop.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: April 23, 2013
    Assignee: FeCon GmbH
    Inventor: Stephan Rexilius
  • Patent number: 8416593
    Abstract: A switching power supply includes a rectifier circuit, a converter, a detecting unit, a control unit, a switching unit, and a protection unit. The rectifier circuit is used for rectifying an input voltage into a first direct current voltage. The converter is configured for generating a first current according to the first direct current voltage. The detecting unit is used for generating a detected voltage according to the first current. The control unit is configured for generating a control signal. The switching unit is used for enabling the converter, and conducting the first current to the detecting unit when receiving the control signal. The protection unit is configured for shunting the first current with the detecting unit when the first current becomes a large current surge. The control unit stops generating the control signal when determining that the detected voltage is equal to or higher than a predetermined value.
    Type: Grant
    Filed: December 9, 2008
    Date of Patent: April 9, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Yong Xiong, Yong-Song Shi, Yong Li, Tao Wang
  • Patent number: 8406018
    Abstract: The present invention is to provide a series resonant converter with an overload delay and short-circuit protection mechanism, which includes a voltage sensing circuit for sensing a voltage ripple level on a primary side of a transformer thereof, that corresponds to a load on a secondary side of the transformer, and generating and sending a DC detection level to an overload delay circuit and a short-circuit protection circuit thereof accordingly. The overload delay circuit and the short-circuit protection circuit are able control the converter through a resonant controller chip to output different currents according to magnitude of the load on the secondary side and maintain stable operation for a predetermined delay time even if the secondary side is overloaded, however, once the secondary side is short-circuited, the converter is turned off instantly. Thus, the converter is effectively prevented from damage which may otherwise result from sustained overload or short circuit.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: March 26, 2013
    Assignee: Skynet Electronic Co., Ltd.
    Inventor: Jim-Hung Liang