Abstract: A coupling member includes: first, second, and third portions each having a flat plate-like shape; and a fillet portion. The first portion has a first side and a second side orthogonal to each other. The second portion is bent at the first side relative to the first portion, and extends to an inner surface of the first portion. The third portion is bent at the second side relative to the first portion, and extends to an inner surface of the first portion. A bend radius of an outer surface of the coupling member at the first side is equal to a bend radius of a surface of a first extending member facing the first side. A bend radius of an outer surface of the coupling member at the second side is equal to a bend radius of a surface of a second extending member facing the second side.

Abstract: In an uninterruptible power supply apparatus, AC current, which includes a feedback component having a value corresponding to deviation between terminal-to-terminal voltage of a capacitor and reference voltage, and a feed forward component obtained by multiplying load current by a gain, is passed into a converter such that the terminal-to-terminal voltage of the capacitor becomes the reference voltage. The gain is set to a first gain in an inverter power feed mode and a bypass power feed mode, and the gain is set to a second gain smaller than the first gain in a switching period of switching between the inverter power feed mode and the bypass power feed mode, to prevent the terminal-to-terminal voltage of the capacitor from exceeding an upper limit voltage in a lap power feed mode.

Abstract: In a mist flow rate measuring apparatus of the present disclosure, an external discharge pipe is constituted of a combination of an upstream pipe, a large-diameter transparent pipe, and a downstream pipe. A part of a mist flowing region in the large-diameter transparent pipe is an imaging target region of a mist imaging camera. An inner diameter D31 of the large-diameter transparent pipe is set to a value larger than an inner diameter D7 of the upstream pipe and an inner diameter D8 of the downstream pipe. That is, the large-diameter transparent pipe, the upstream pipe, and the downstream pipe have a magnitude relationship with respect to the inner diameter of {D31>D7=D8}.

Abstract: An overtemperature detecting system according to an embodiment detects a temperature abnormality of a dry-type transformer (hereinafter, referred to as a transformer) cooled by a cooling device. The overtemperature detecting system includes a temperature determining unit. The temperature determining unit determines and outputs a temperature abnormality of the transformer by changing determination conditions of the temperature abnormality of the transformer using operation states during operating and during stopping of the cooling device.

Abstract: A power conversion device includes: a dead time application unit which applies a dead time to only one of a pair of pulse signals; a current polarity detection unit which detects a polarity of an output current; and a gate signal selection unit which, if the polarity of the output current is positive, selects the one pulse signal, to which the dead time has been applied, as a gate signal for a positive arm and selects the other pulse signal as a gate signal for a negative arm, and, if the polarity of the output current is negative, selects the one pulse signal, to which the dead time has been applied, as the gate signal for the negative arm and selects the other pulse signal as the gate signal for the positive arm.

Abstract: The present disclosure relates to a tail end buckling suppression device for a tandem rolling mill rolling a material to be rolled by N (N?2) successive rolling stands. Each i-th rolling stand (1?i?N) of the tandem rolling mill includes an i-th roll bender device screwing down the material to be rolled with preset roll bender pressure. During a period after a tail end of the material to be rolled comes out of one designated j-th rolling stand (1?j?N?1) until the tail end of the material to be rolled comes out of the N-th rolling stand, the tail end buckling suppression device causes each of j+1-th to N-th roll bender devices downstream of the j-th rolling stand to continuously lower the roll bender pressure.

Abstract: In the uninterruptible power supply, when the input switch is connected between the input terminal and the AC node of the converter and the fourth operation mode is selected, the input switch is turned off and the bypass switch is turned on, and the converter is controlled to convert the DC power of the battery into AC power and supply the AC power to the load via the bypass switch. Thus, even if the inverter is failed when the commercial AC power source is failed, it is possible to drive the load.

Abstract: In a power conversion device for performing conversion from DC to AC, a positive-side capacitor and a negative-side capacitor with their connection point serving as a neutral point are provided between the positive and negative sides of the inputted DC power, and a switching pattern for specifying switching phases which are timings of ON/OFF driving switching elements of an inverter which outputs AC voltage having at least a positive-side potential, a negative-side potential, and a neutral point potential, is calculated so as to satisfy conditions for ensuring a modulation factor, eliminating harmonic components for respective orders of output voltage, ensuring a predetermined value for a phase difference between adjacent switching phases, and balancing voltage of the positive-side capacitor and voltage of the negative-side capacitor.

Abstract: A sub-module of a power conversion device includes: an IGBT, a drive circuit that drives the IGBT, a laminated bus bar on which the IGBT is mounted; a substrate on which the drive circuit is mounted; a housing frame for accommodating the IGBT, the drive circuit, the laminated bus bar, and the substrate; and a separation frame for separating a space in which the drive circuit and the substrate are disposed from a space in which the IGBT and the laminated bus bar are disposed.

Abstract: An uninterruptible power supply device includes a bidirectional chopper that converts a first DC voltage supplied from a battery into a second DC voltage and supplies the second DC voltage to an inverter when a power failure of a commercial AC power supply occurs. The bidirectional chopper includes a capacitor that stabilizes the second DC voltage. The uninterruptible power supply device further includes: a current detector that detects an output current of the battery; and a control circuit that, based on a detection result by the current detector, calculates an estimated temperature increase value of the capacitor every time a predetermined time period elapses, and stops an operation of the bidirectional chopper when the calculated estimated temperature increase value is higher than an upper limit value.

Abstract: An uninterruptible power supply system includes: a group of electrical components that constitute the uninterruptible power supply system and are disposed in a first block of the housing; the other group of electrical components that constitute the uninterruptible power supply system and are disposed in a second block of the housing; and a partition structure disposed adjacent to an exhaust side of the second block to adjust an air flow flowing through the first block and the second block.

Abstract: One direction discharge structure in an active gas generation apparatus satisfies arrangement conditions (a) to (c). The condition (a) is a condition that a region where a corresponding metal electrode and a corresponding metal electrode are overlapped with each other in a plan view serves as a corresponding discharge space in a corresponding gap region. The condition (b) is a condition that the corresponding gap region and a plurality of gas supply holes provided in a corresponding gas supply region are overlapped with each other in a plan view. The condition (c) is a condition that the plurality of gas supply holes provided in the corresponding gas supply region and a plurality of gas ejection holes provided below the corresponding gap region sandwich the corresponding discharge space in a plan view, and are disposed to face each other on a one-to-one basis along a Y direction.

Abstract: An element module includes an element, a plurality of conductive members, and a spacer member. The plurality of conductive members are connected to the element and arranged in a predetermined direction. The spacer member is disposed between two conductive members of the plurality of conductive members adjacent to each other in the predetermined direction and is in contact with parts of the two conductive members.

Abstract: An explosion-proof structure having a housing that houses an electronic device, a cover member that covers a first ventilation port formed on one surface of the housing at least in a normal direction to the one surface, an opening/closing member that opens and closes a second ventilation port formed between the one surface and the cover member, and a rotation support portion provided at a peripheral portion of the first ventilation port and that supports the opening/closing member, the opening/closing member rotating around the rotation support portion, using the rotation support portion as a center of rotation.

Abstract: In an ultrasonic joining apparatus according to the present disclosure, an ultrasonic joining apparatus control board controls an operation of a lead set unit and a tension adjustment unit including a dancer roller to perform joining tension control processing. The joining tension control processing includes steps of: making a lead wire housing mechanism perform a rewinding driving of rewinding a lead wire in a lead cassette when the dancer roller reaches a lower limit adjustment position in a tension adjustment range; and making the lead wire housing mechanism perform a delivery driving of sending out the lead wire from the lead cassette when the dancer roller reaches an upper limit adjustment position in the tension adjustment range.

Abstract: A first current detector detects an output current of a modular uninterruptible power supply apparatus. Each of a plurality of power conversion modules includes a resistive element and a second switch. The second switch connects the first current detector and the resistive element in parallel in an ON state. Each of first control circuits turns on the second switch when setting a corresponding power conversion module to an operating state, and turns off the second switch when setting the power conversion module to a stopped state. Each of the first control circuits detects a shared current of the corresponding power conversion module based on a current flowing through the resistive element when the second switch is in the ON state. Each of the first control circuits controls a power converter such that an output current of the power conversion module matches the shared current.

Abstract: A main controller includes a first programmable device, a device, and a first selector. Each controller includes a second programmable device and a second selector. The second programmable device includes a memory and a processor. The first selector connects the first programmable device to a serial communications line when the uninterruptible power supply is in operation. In response to the device receiving an instruction to perform an update process, the first selector connects the device to the serial communications line. The second selector connects the processor to the serial communications line when the uninterruptible power supply is in operation. In response to the processor receiving the instruction to perform the update process from the first programmable device while the uninterruptible power supply is in operation, the second selector connects the memory to the serial communications line.

Abstract: A power conversion device includes a base, a first stage, a first support portion, and a support member. At least one first power conversion unit is mounted on the first stage. The first support portion extends in a normal direction of the base and is fixed to the base and the first stage. The support member includes a first panel and a second panel. The first panel and the second panel are disposed on the base to support the first stage in the Z-axis direction. The first panel and the second panel are integrally formed to intersect with each other.

Abstract: A distributed-power-supply power conversion system includes a plurality of power inverters configured to invert DC power to AC power; and a control device configured to select at least one power inverter from the plurality of power inverters as a power inverter used for testing, and configured to perform an energization test of the power inverter used for testing in a state where an AC side of the power inverter used for testing is disconnected from a system, and is connected to an AC power supply device and to a load bank, and a voltage on the AC side of the power inverter used for testing is established. The distributed-power-supply power conversion system can perform an energization test of a power inverter before a system receives power.

Abstract: A power conversion unit includes a plurality of semiconductor modules, a gate drive circuit, a first substrate having a flat plate shape, and a second substrate having a flat plate shape. The first substrate has a first surface facing a bottom plate of a casing accommodating the semiconductor modules and the gate drive circuit, and a second surface on an opposite side to the first surface. The second substrate is arranged above the first substrate in parallel with the second surface. The semiconductor modules are mounted on the first surface. The gate drive circuit is formed on a surface of the second substrate on a side that does not face the second surface. The power conversion unit further includes a connector provided on the second surface and connected to a surface on a side facing the second substrate.