Omron Corporation

Takeo Nishikawa

Wataru Okada

Tomohiko Matsushita

Shigeru Aoyama

Makoto Ohashi

Satoshi Iwai

Junichiro Yamada

Noriyuki Nosaka

Shingo Nagaoka

Tetsuichi Wazawa

Hiroyuki Onishi

Hideyuki Yamashita

Takanori Ishii

Takashi Hyodo

Hironori Nakada

Takuya Nakai

Shigemi Norioka

Takayoshi Tawaragi

Yuhki Kamatani

Gun Eto

Ryosuke Hasui

Yuko Tsuda

Yoshinori Sunahata

Kenji Kobayashi

Masaaki Shimizu

Kentaro Hamana

Takeshi Ashida

Hiroyuki Tokusaki

Masayuki Suetomi

Masashi Doi

Eiichi Omura

Isao Fujihata

Yutaro Okuno

Hidetoshi Kotera

Hiroo Iwata

Syo Sasaki

Natsuko Horiguchi

Satoshi Fujita

Hiroki Kawano

Kuniyuki Hirai

Keiji Shiraishi

Liangyu Shen

Toshiyuki Yokoi

Megumi Moriyama

A motor controller includes a plurality of inverters that supply power to a corresponding motor of a plurality of motors through pulse width modulation control, a direct current power supply that supplies power to the plurality of inverters, and a capacitor connected parallel to the direct current power supply. Each of the plurality of inverters is categorized into one of a plurality of groups based on a switching frequency. All inverters in each of the groups have corresponding carrier signals being triangular wave signals determined based on a reference frequency assigned to the group. At least one of the triangular wave signals has at least one of a frequency or a phase different from a frequency or a phase of another triangular wave signal of the triangular wave signals.

Motor control device

A power converter apparatus includes a switching circuit generating an AC voltage by switching a DC voltage at a predetermined switching frequency, and a filter circuit converting the AC voltage from the switching circuit into the DC voltage by low-pass filtering the AC voltage. The filter circuit includes first and second bypass capacitors, and an inductor. The first bypass capacitor bypasses noise of a first frequency component of the AC voltage from the switching circuit, and the second bypass capacitor bypasses noise of a second frequency component of the AC voltage from the switching circuit, which is lower than the first frequency component. The inductor is between the first and second bypass capacitors, and the inductance thereof is set so that a resonance frequency of the filter circuit is lower than multiple times the switching frequency by insertion of the inductor, thereby reducing the switching noise flowing to the load.

Power converter apparatus provided with low-pass filter circuit for reducing switching frequency components

A driver circuit controls a first switch element. A first resistor is connected between the driver circuit and the first switch element. A second switch element is connected to the first switch element. An overcurrent detector circuit controls the second switch element based on an overcurrent current flowing through the first switch element. A second resistor is connected between the overcurrent detector circuit and the second switch element. The first and second resistor is set such that a turn-off time of the first switch element when the second switch element is turned on by the overcurrent detector circuit is longer than a turn-off time of the first switch element when the first switch element is turned off by the driver circuit.

Switch circuit capable of overcurrent protection with small and simple circuit, and with simple operation, without affecting normal operation

A power converter apparatus is provided to include a switching circuit, and a filter circuit. The switching circuit generates an AC voltage by switching a DC voltage at a predetermining switching frequency, and the filter circuit converts the AC voltage from the switching circuit into the DC voltage by low-pass filtering the AC voltage. The filter circuit induces first and second bypass capacitors, and an inductor. The first bypass capacitor bypasses noise of a first frequency component of the AC voltage from the switching circuit, and the second bypass capacitor bypasses noise of a second frequency component of the AC voltage from the switching circuit, which is lower than the first frequency component. The inductor is inserted between the first and second bypass capacitors, and the inductance thereof is set so that a resonance frequency of the filter circuit is lower than the switching frequency by insertion of the inductor.

A power converter is provided with an inverter unit for converting DC power from a DC power supply into AC power, and a control unit that generates a control signal for controlling the inverter unit. The control unit includes an impedance estimation unit that injects a disturbance signal into a load and derives an estimated value of an impedance of the load based on a voltage signal from the load into which the disturbance signal is injected, the impedance compensator unit whose control parameters are set based on the estimated value of the impedance, and that corrects an output current signal in accordance with the control parameters, a command value unit that outputs a command value indicating a control target value, and a control compensator unit that generates a control signal, based on the command value from the command value unit and the current signal from the impedance compensator unit.

Power converter for converting DC power to AC power with adaptive control on characteristics of load

Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A conductive member of the noise eliminator is connected to a stable potential.

Power converter

An inverter has a plurality of switching elements, the states of which are each switched by a pulse signal supplied in accordance with a power grid voltage. The inverter is provided with: a switching circuit that converts an input DC voltage to an AC voltage and outputs the AC voltage to a pair of output lines; a filter circuit having output coils inserted in the output lines; a current detection sensor that detects the current flowing through the output coils; and a high-speed pulse control circuit that, when an absolute value of the detected current is a threshold value or more, stops the supply of the pulse signal to the switching circuit.

Inverter device capable of suppressing overcurrent without increasing a load and operation control method

A heat dissipation structure of a semiconductor device is provided, the semiconductor device including: an electrical bonding surface electrically connected to a substrate; and a heat dissipation surface as an opposite side of the electrical bonding surface. The heat dissipation surface makes contact with a heat spreader via a conductive TIM while the heat spreader makes contact with a heat sink via an insulating TIM. A surface of the heat spreader facing the semiconductor device includes a recess part formed in at least one part in a vicinity of an outer periphery of the semiconductor device.

Heat dissipation structure of semiconductor device

A low-voltage circuit in a bidirectional DC-DC converter converts output AC power from a high-voltage circuit to DC power to charge a smoothing reactor and discharge the smoothing reactor, and includes an active snubber circuit including switching elements and each having a backward diode and a snubber capacitor. The snubber capacitor of the active snubber circuit has its one end connected to a drain end of the switching elements, and has its other end connected to a node between a center tap of a high-frequency transformer and a smoothing reactor.

Bidirectional DC-DC converter, power conditioner, and distributed power system

Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A flexible connecting line connected to a conductive member of the noise eliminator is connected to an on-board line disposed on a circuit board.

An inverter circuit provided in a power conversion device includes a full-bridge inverter, and a short circuit part. The short circuit part includes switching elements and clamp elements connected to the switching elements. The clamp elements suppress application of an excessive voltage such as a surge voltage to the switching elements.

Inverter circuit and power conversion device

A current resonant type DC voltage converter includes: a switching circuit configured to generate an AC voltage from a DC input voltage; a LC resonance circuit configured to resonate in response to application of the AC voltage to a resonant capacitor and a resonant coil; a transformer having a primary side connected in series to the LC resonance circuit; a parallel resonant inductance present in parallel to the transformer; a rectifier circuit configured to rectify a current appearing on a secondary side of the transformer to generate a DC output voltage; and a parallel resonant inductance adjustment circuit configured to change the parallel resonant inductance.

Current resonant type DC voltage converter, control integrated circuit, and current resonant type DC voltage conversion method

A power control apparatus includes: a first conversion apparatus that applies DC/DC conversion to direct current power from a power generator for generating power using natural energy, and outputs the resultant power; a second conversion apparatus that applies DC/DC conversion to the power output from the first conversion apparatus and charges a power storage unit with the resultant power, and also applies DC/DC conversion to power from the power storage unit and discharges the resultant power; a third conversion apparatus that supplies alternating current power to a power system and an alternating current load by applying DC/AC conversion to the power output from the first conversion apparatus and/or the power discharged by the second conversion apparatus; and a controller that causes the second conversion apparatus to perform the discharge so that the power output from the third conversion apparatus is higher than power consumed by the alternating current load.

Power control apparatus, power control method, program, and energy management system

A power control apparatus includes: a direct current bus serving as a path for supplying direct current power; a first conversion apparatus that applies DC/DC conversion to direct current power from a power generator for generating power using natural energy, and outputs the resultant direct current power to the direct current bus; a second conversion apparatus that applies DC/DC conversion to the direct current power and charges a power storage unit with the resultant direct current power, and also applies DC/DC conversion to direct current power from the power storage unit and discharges the resultant direct current power to the direct current bus; a third conversion apparatus that applies DC/AC conversion to the direct current power from the direct current bus and supplies alternating current power to a power system and an alternating current load; and a controller that controls driving of the first to third conversion apparatuses.

The present disclosure relates to a storage battery control device that can exert better performance in a configuration in which a plurality of storage batteries are connected, a storage battery control method, a program, an electricity storage system, and a power supply system. A charge order table previously set according to a state of charge and a charge/discharge frequency of a storage battery that stores power is referred to, and based on the states of charge and the charge/discharge frequencies acquired from the storage battery provided in plural, a discharge order based on which discharge is preferentially performed with respect to the plurality of storage batteries is decided. In order to supply necessary power necessary to be output upon a request from a load, discharge power output from each of the plurality of storage batteries is set based on the decided discharge order.

Growing community of inventors

Kyoto, Japan

Takeo Nishikawa