Abstract: An object of the present invention is to provide a power conversion device capable of specifying a failure location of an inverter in detail when an attempt of active discharge fails. There are provided an arithmetic operation circuit 102 that outputs a discharge instruction to control a discharge operation based on a voltage between both ends of a discharge circuit, and an output circuit 203 that outputs a drive signal based on the control signal. The arithmetic operation circuit 102 monitors an amount of the decreased voltage between both the ends of the discharge circuit, an LV read back signal being an output of the arithmetic operation circuit 102, and an HV read back signal being an output of the output circuit 203, and specifies a failure location.

Abstract: According to one embodiment, a supervisory circuit includes a trigger determination circuit and a trigger table. The trigger determination circuit receives signal processing signals outputted from a plurality of signal processing circuits as trigger signals, determines whether processing operations by the signal processing circuits are executed in a predetermined order, and outputs an interrupt signal when detecting a trigger signal out of setting. The trigger table is provided with trigger-specific tables corresponding to the respective signal processing circuits, reads a trigger setting to occur next based on a trigger determined as being correct by the trigger determination circuit, and outputs a table read signal to the trigger determination circuit.

Abstract: According to one embodiment, a supervisory circuit includes a trigger determination circuit and a trigger table. The trigger determination circuit receives signal processing signals outputted from a plurality of signal processing circuits as trigger signals, determines whether processing operations by the signal processing circuits are executed in a predetermined order, and outputs an interrupt signal when detecting a trigger signal out of setting. The trigger table is provided with trigger-specific tables corresponding to the respective signal processing circuits, reads a trigger setting to occur next based on a trigger determined as being correct by the trigger determination circuit, and outputs a table read signal to the trigger determination circuit.

Abstract: A screw supercharger is provided having a set of male and female screw rotors rotatably supported in a casing and driven through a wrapping transmission including belts and pulleys by a prime mover, wherein a through hole is formed in the wall of the causing at a position through which the input shaft of the screw rotor or the extension of the axis of the input shaft of the screw rotor extends, in that a cylindrical bearing supporting part is formed around the through hole so as to project outside from the casing, and in that a driven pulley is supported through bearings on the bearing supporting part and is fixedly mounted on the input shaft.