Abstract: A control device of an uninterruptible power supply apparatus turns on a first switch and a second switch and turns off a third switch in an inverter power feed mode, turns on the first and third switches and turns off the second switch in a bypass power feed mode, and executes a lap power feed mode of turning off the first switch and turning on the second and third switches in a switching period in which one mode of the inverter power feed mode and the bypass power feed mode is switched to the other mode.

Abstract: A control device of an uninterruptible power supply apparatus turns on a first switch and a second switch and turns off a third switch in an inverter power feed mode, turns on the first and third switches and turns off the second switch in a bypass power feed mode, and executes a lap power feed mode of turning off the first switch and turning on the second and third switches in a switching period in which one mode of the inverter power feed mode and the bypass power feed mode is switched to the other mode.

Abstract: In this uninterruptible power supply system, a first converter (2) for generating a DC voltage and a second converter (5) for regenerating power are separately provided. DC buses (L1 to L3) are connected to the second converter (5) and to a bidirectional chopper (6) with bus bars (B1 to B3). The bus bars (B1 to B3) are formed into a laminated bus bar (24). First semiconductor modules (M1d, M2d) included in the second converter (5) and second semiconductor modules (M1a to M1c, M2a to M2c) included in the bidirectional chopper (6) are each mounted on the laminated bus bar (24) and connected to the bus bars (B1 to B3). The bus bars (B1 to B3) and the first and second semiconductor modules (M1a to M1d, M2a to M2d) are configured as an integrated converter unit (7).

Abstract: In an uninterruptible power supply apparatus, a converter (1) is controlled such that terminal-to-terminal voltage (VDC) of a capacitor (Cd) becomes a first reference voltage (VDCr1) in an inverter power feed mode and a bypass power feed mode. In a switching period in which the inverter power feed mode and the bypass power feed mode are switched, the converter is controlled such that the terminal-to-terminal voltage of the capacitor becomes a second reference voltage (VDCr2) higher than the first reference voltage to prevent circulating current (IC) from flowing through a path including the capacitor.

Abstract: Each of n uninterruptible power supplies connected in parallel includes m uninterruptible power supply modules connected in parallel between an input terminal and an output terminal. In each uninterruptible power supply module, a controller controls an inverter so that the current value of AC power supplied from the inverter to a load matches a first instruction value. The n×m controllers are connected to one another to constitute an integrated controller. When a failure is detected in one of the m uninterruptible power supply modules in any one of the n uninterruptible power supplies, the integrated controller disconnects the failed uninterruptible power supply module and changes the first instruction value to a second instruction value so as to equalize the current values of AC power output from the inverters of the remaining normal uninterruptible power supply modules.

Abstract: In an uninterruptible power supply apparatus, a converter (1) is controlled such that terminal-to-terminal voltage (VDC) of a capacitor (Cd) becomes a first reference voltage (VDCr1) in an inverter power feed mode and a bypass power feed mode. In a switching period in which the inverter power feed mode and the bypass power feed mode are switched, the converter is controlled such that the terminal-to-terminal voltage of the capacitor becomes a second reference voltage (VDCr2) higher than the first reference voltage to prevent circulating current (IC) from flowing through a path including the capacitor.

Abstract: A first controller for a first DC/DC converter is configured to generate a first current command value based on a smallest value of an output current when an output voltage of the solar battery is equal to an optimum operating voltage in maximum power point tracking control and an output current for outputting a consumption current between the solar battery and the DC load and a charging current of the power storage apparatus. A second controller for a second DC/DC converter is configured to generate a second current command value such that a voltage of the output terminal is equal to a reference voltage.

Abstract: Each of n uninterruptible power supplies connected in parallel includes m uninterruptible power supply modules connected in parallel between an input terminal and an output terminal. In each uninterruptible power supply module, a controller controls an inverter so that the current value of AC power supplied from the inverter to a load matches a first instruction value. The n×m controllers are connected to one another to constitute an integrated controller. When a failure is detected in one of the m uninterruptible power supply modules in any one of the n uninterruptible power supplies, the integrated controller disconnects the failed uninterruptible power supply module and changes the first instruction value to a second instruction value so as to equalize the current values of AC power output from the inverters of the remaining normal uninterruptible power supply modules.

Abstract: A converter includes a first diode having an anode and a cathode connected respectively to an input terminal and a first output terminal, a second diode having an anode and a cathode connected respectively to a second output terminal and the input terminal, a first transistor connected between the first output terminal and the input terminal, a second transistor connected between the input terminal and the second output terminal, and a bidirectional switch connected between the input terminal and a third output terminal and including third to sixth diodes and a third transistor. Each of the first diode, the second diode, and the third transistor is made of a wide bandgap semiconductor. Each of the first and second transistors and the third to sixth diodes is made of a semiconductor other than the wide bandgap semiconductor.

Abstract: A first controller for a first DC/DC converter is configured to generate a first current command value based on a smallest value of an output current when an output voltage of the solar battery is equal to an optimum operating voltage in maximum power point tracking control and an output current for outputting a consumption current between the solar battery and the DC load and a charging current of the power storage apparatus. A second controller for a second DC/DC converter is configured to generate a second current command value such that a voltage of the output terminal is equal to a reference voltage.

Abstract: A converter includes a first diode having an anode and a cathode connected respectively to an input terminal and a first output terminal, a second diode having an anode and a cathode connected respectively to a second output terminal and the input terminal, a first transistor connected between the first output terminal and the input terminal, a second transistor connected between the input terminal and the second output terminal, and a bidirectional switch connected between the input terminal and a third output terminal and including third to sixth diodes and a third transistor. Each of the first diode, the second diode, and the third transistor is made of a wide bandgap semiconductor. Each of the first and second transistors and the third to sixth diodes is made of a semiconductor other than the wide bandgap semiconductor.

Abstract: In this uninterruptible power supply system, a first converter (2) for generating a DC voltage and a second converter (5) for regenerating power are separately provided. DC buses (L1 to L3) are connected to the second converter (5) and to a bidirectional chopper (6) with bus bars (B1 to B3). The bus bars (B1 to B3) are formed into a laminated bus bar (24). First semiconductor modules (M1d, M2d) included in the second converter (5) and second semiconductor modules (M1a to M1c, M2a to M2c) included in the bidirectional chopper (6) are each mounted on the laminated bus bar (24) and connected to the bus bars (B1 to B3). The bus bars (B1 to B3) and the first and second semiconductor modules (M1a to M1d, M2a to M2d) are configured as an integrated converter unit (7).

Abstract: An uninterruptible power supply system includes a plurality of uninterruptible power supply devices, and each uninterruptible power supply device includes a conversion circuit, an inversion circuit, a DC positive bus, a DC negative bus, and a capacitor. The uninterruptible power supply system includes a first fuse connected between DC positive buses of two uninterruptible power supply devices, and a second fuse connected between DC negative buses of the two uninterruptible power supply devices. DC voltages between the plurality of DC positive buses and between the plurality of DC negative buses can be made uniform and a cross current can be suppressed. Even when one uninterruptible power supply device fails and an overcurrent flows between the two DC positive buses and between the two DC negative buses, the failure range can be narrowly limited by the first and second fuses.

Abstract: An uninterruptible power supply system includes a plurality of uninterruptible power supply devices, and each uninterruptible power supply device includes a conversion circuit, an inversion circuit, a DC positive bus, a DC negative bus, and a capacitor. The uninterruptible power supply system includes a first wiring connected between DC positive buses of two uninterruptible power supply devices, and a second wiring connected between DC negative buses of the two uninterruptible power supply devices. The operation of all uninterruptible power supply devices is stopped in response to an absolute value of a current flowing through a bundle of the first and second wirings exceeding an upper limit value.

Abstract: An uninterruptible power supply system includes a plurality of uninterruptible power supply devices, and each uninterruptible power supply device includes a conversion circuit, an inversion circuit, a DC positive bus, a DC negative bus, and a capacitor. The uninterruptible power supply system includes a first fuse connected between DC positive buses of two uninterruptible power supply devices, and a second fuse connected between DC negative buses of the two uninterruptible power supply devices. DC voltages between the plurality of DC positive buses and between the plurality of DC negative buses can be made uniform and a cross current can be suppressed. Even when one uninterruptible power supply device fails and an overcurrent flows between the two DC positive buses and between the two DC negative buses, the failure range can be narrowly limited by the first and second fuses.

Abstract: An uninterruptible power supply system includes a plurality of uninterruptible power supply devices, and each uninterruptible power supply device includes a conversion circuit, an inversion circuit, a DC positive bus, a DC negative bus, and a capacitor. The uninterruptible power supply system includes a first wiring connected between DC positive buses of two uninterruptible power supply devices, and a second wiring connected between DC negative buses of the two uninterruptible power supply devices. The operation of all uninterruptible power supply devices is stopped in response to an absolute value of a current flowing through a bundle of the first and second wirings exceeding an upper limit value.

Abstract: To form a through hole at one portion of a side wall, of an expanded portion made by plastically deforming one part of a metal tube radially outward, in a portion where the plate thickness gradually changes, a slide tool is withdrawn from inside a punch hole while applying hydraulic pressure to the inside of the side wall. At the instant of commencing withdrawal of the slide tool, the degree of progress in the shearing for the portions of the side wall matching with the two side edges of the punch hole is made different. Then, the timing for moving from shearing to rupture is made to coincide, so that of the side wall, the portions matching with the punch hole, are made reliably into a blank, and are extracted from the side wall.

Abstract: A structure and method are provided for forming a through hole at one portion of a side wall of an expanded portion made by plastically deforming one part of a metal tube radially outward, in a portion where the plate thickness gradually changes. A slide tool is withdrawn from inside a punch hole while applying hydraulic pressure to the inside of the side wall. Regarding a tip end face of the slide tool, a portion facing the portion of the side wall where the plate thickness is relatively thick is recessed. At the instant of commencing withdrawal of the slide tool, the degree of progress in the shearing for the portions of the side wall matching with the two side edges of the punch hole is made different. Then, the timing for moving from shearing to rupture is made to coincide, so that of the side wall, the portions matching with the punch hole, are made reliably into a blank, and are extracted from the side wall.

Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.