Abstract: To obtain a power conversion device reduced in size and weight wherein heat generated from a capacity module is sufficiently dissipated, thus enabling prevention of a rise in the temperature of the capacity module. The power conversion device includes a first cooler which, having mounted thereon the capacity module, cools heat generated from the capacity module; a second cooler which, having mounted thereon a semiconductor module, cools heat generated from the semiconductor module; and a heat dissipation plate which, being thermally connected to the capacity module and to the second cooler, dissipates via the second cooler one portion of the heat generated from the capacity module, wherein the first and second coolers, being disposed so as to form a refrigerant flow path, both share a refrigerant.

Abstract: Provided is a power converter which enables improved performance, and allows each of a semiconductor module and a capacitor module to be more reliably cooled. In a power converter, a capacitor module includes a capacitor module main body facing a cooling surface of a cooler, while being apart from the cooling surface, and a heat conductive member provided in the capacitor module main body. The capacitor module main body is connected to a semiconductor module via an N-side bus bar and a P-side bus bar. A heat radiation portion of the heat conductive member is thermally connected to the cooling surface at a position more distant from the semiconductor module than an end portion of the capacitor module main body which is closer to the semiconductor module.

Abstract: Provided is a power converter which enables improved performance, and allows each of a semiconductor module and a capacitor module to be more reliably cooled. In a power converter, a capacitor module includes a capacitor module main body facing a cooling surface of a cooler, while being apart from the cooling surface, and a heat conductive member provided in the capacitor module main body. The capacitor module main body is connected to a semiconductor module via an N-side bus bar and a P-side bus bar. A heat radiation portion of the heat conductive member is thermally connected to the cooling surface at a position more distant from the semiconductor module than an end portion of the capacitor module main body which is closer to the semiconductor module.

Abstract: Provided is a current control apparatus including a first cooler that cools a switch element, a bus bar connected to the switch element, a core penetrated by the bus bar, a magneto-electric transducer, which is inserted into the core in order to detect a value of a current supplied to the switch element, a controller that controls the switch element, a case, and a cover, wherein the core includes an exposed disposal structure in which a part of the core is exposed to the exterior of the case as an exposed portion, and the current control apparatus further includes a divided cooling structure in which the exposed portion is cooled without being affected by the temperature of the first cooler that cools the switch element.

Abstract: The control device for a rotary electrical machine which is connected between a DC power source and a rotary electrical machine and which controls driving of the rotary electrical machine by converting DC power from the DC power source into AC power, includes a power conversion circuit which is configured from a plurality of switching elements, a phase current detection unit which detects phase currents in the rotary electrical machine, a phase current ratio derivation unit which derives a ratio in which the phase currents detected by the phase current detection unit are equal to or greater than a reference value, or equal to or lower than the reference value, and an element fault determination unit which determines a fault status of each of the switching elements when the ratio derived by the phase current ratio derivation unit is equal to or greater than a previously established ratio threshold value.

Abstract: The control device for a rotary electrical machine which is connected between a DC power source and a rotary electrical machine and which controls driving of the rotary electrical machine by converting DC power from the DC power source into AC power, includes a power conversion circuit which is configured from a plurality of switching elements, a phase current detection unit which detects phase currents in the rotary electrical machine, a phase current ratio derivation unit which derives a ratio in which the phase currents detected by the phase current detection unit are equal to or greater than a reference value, or equal to or lower than the reference value, and an element fault determination unit which determines a fault status of each of the switching elements when the ratio derived by the phase current ratio derivation unit is equal to or greater than a previously established ratio threshold value.

Abstract: A discharge device includes a switch element connected in parallel to an electrical storage element; a constant current output unit which supplies a constant current to the switch element; and a control unit which gives an on or off instruction to the constant current output unit, wherein a configuration is such that the control unit controls the constant current output unit so as to cause energy with which is charged in the electrical storage element to be discharged while being consumed by the switch element, and within an optional time for which an energization current of the switch element reaches a limiting current of the switch element, turn off the switch element in a region in which the energization current is lower than the limiting current.

Abstract: Provided is a current control apparatus including a first cooler that cools a switch element, a bus bar connected to the switch element, a core penetrated by the bus bar, a magneto-electric transducer, which is inserted into the core in order to detect a value of a current supplied to the switch element, a controller that controls the switch element, a case, and a cover, wherein the core includes an exposed disposal structure in which a part of the core is exposed to the exterior of the case as an exposed portion, and the current control apparatus further includes a divided cooling structure in which the exposed portion is cooled without being affected by the temperature of the first cooler that cools the switch element.

Abstract: A discharge device includes a switch element connected in parallel to an electrical storage element; a constant current output unit which supplies a constant current to the switch element; and a control unit which gives an on or off instruction to the constant current output unit, wherein a configuration is such that the control unit controls the constant current output unit so as to cause energy with which is charged in the electrical storage element to be discharged while being consumed by the switch element, and within an optional time for which an energization current of the switch element reaches a limiting current of the switch element, turn off the switch element in a region in which the energization current is lower than the limiting current.