Abstract: A turbocharger includes ball bearings each including an inner ring and an inner ring mounted to a shaft, and an outer ring and an outer ring provided so as to be relatively rotatable in a bearing hole, and damper portions formed in at least one of outer peripheral surfaces of the outer ring and the outer ring and opposed surfaces of inner peripheral surface of the bearing hole opposed to the outer peripheral surfaces of the outer ring and the outer ring.

Abstract: In the power conditioner having a step-up chopper connected to a plurality of solar cell strings, when a current flowing in the reverse direction from the normal direction due to a short circuit fault of any step-up chopper is detected, a relay is opened, and an inverter is stopped. A gate of an IGBT of the step-up chopper where a short circuit fault has occurred is turned off. Solar cell strings are controlled in a way that at least any of power, a voltage and a current input to a solar cell string is set as less than or equal to a predetermined threshold value.

Abstract: A power conversion device includes: a DC/DC convertor (5) that performs DC/DC conversion on an output voltage of a direct-current power supply (for example, a solar battery module (1)); and a DC/AC invertor (6) that performs DC/AC conversion on an output voltage of the DC/DC convertor (5). The output power of the DC/AC invertor (6) is controlled such that the charge and discharge of a storage device (for example, a storage battery (3)) connected to a connection point between an output end of the DC/DC convertor (5) and an input end of the DC/AC invertor (6) are controlled.

Abstract: A power conversion device includes: a DC/DC convertor (5) that performs DC/DC conversion on an output voltage of a direct-current power supply (for example, a solar battery module (1)); and a DC/AC invertor (6) that performs DC/AC conversion on an output voltage of the DC/DC convertor (5). The output power of the DC/AC invertor (6) is controlled such that the charge and discharge of a storage device (for example, a storage battery (3)) connected to a connection point between an output end of the DC/DC convertor (5) and an input end of the DC/AC invertor (6) are controlled.

Abstract: An inverter device, which has two operation modes including a grid-connected operation mode where the inverter device is interconnected with a commercial power system, and an isolated operation mode where the inverter device is independent of a commercial power system and performs an isolated operation, includes an inverter converting direct-current power received from a direct-current power supply of a solar battery array into alternating-current power, a control unit controlling an action of an inverter device, a plug for outputting the alternating-current power converted by the inverter, and a load-connecting receptacle on a path of a power supply line connecting the inverter and the plug, for outputting the alternating-current power.

Abstract: An inverter device, which has two operation modes including a grid-connected operation mode where the inverter device is interconnected with a commercial power system, and an isolated operation mode where the inverter device is independent of a commercial power system and performs an isolated operation, includes an inverter converting direct-current power received from a direct-current power supply of a solar battery array into alternating-current power, a control unit controlling an action of an inverter device, a plug for outputting the alternating-current power converted by the inverter, and a load-connecting receptacle on a path of a power supply line connecting the inverter and the plug, for outputting the alternating-current power.

Abstract: An inverter apparatus includes a plurality of converters each receiving a direct current power from respective plurality of solar cell arrays having different output voltage ranges, and an inverter transforming the direct current power from the plurality of converters into an alternating current power and allowing the alternating current power to reversely flow into a commercial power system. The plurality of converters have different voltage input ranges corresponding to the output voltage ranges of the plurality of solar cell arrays, and each control, based on a pulse frequency modulation control signal received from a corresponding converter control unit, an output voltage of corresponding one of the plurality of solar cell arrays, so that an output power from corresponding one of the plurality of solar cell arrays becomes maximum.