Abstract: A vehicular power conversion device is provided with a semiconductor that converts power. The power conversion device is provided with: coolers that are arranged in an array in a vehicle advancement direction and cool the semiconductor; and a cooler cover having the coolers located therein and provided with ventilation openings serving as an intake port and a discharge port for travel-generated airflow. A cavity serving as a passageway for the travel-generated airflow is provided in at least one of above, below, and to the side of the plurality of coolers inside the cooler cover. The ventilation openings are disposed in the vehicle advancement direction from the cavity. The airflow-receiving plate is located in the cavity and, when the travel-generated airflow flows from the ventilation opening into the cavity, changes the direction of the incoming travel-generated airflow to a direction toward the coolers.

Abstract: A filter device that removes a noise current generated by an inverter includes a first filter capacitor that is provided in parallel to a direct-current unit of the inverter, a first filter reactor that is provided between a high-potential side of the first filter capacitor and an overhead line that is a power supply source of direct-current power, and a series circuit unit in which a fuse serving as a circuit disconnecting unit that is disconnected when a current larger than a rated current flows therein, a second filter reactor serving as an inductance element, and a second filter capacitor serving as a capacitance element are connected in series, where one end of the series circuit unit is connected to a low-potential side of the first filter capacitor and one end of the first filter reactor is connected to the series circuit unit.

Abstract: A control apparatus mounted on a railcar including a plurality of wheelsets includes: a torque basic value setting portion configured to set a basic value of torque applied to each of the plurality of wheelsets; an adhesion determining portion configured to determine whether or not each of the plurality of wheelsets adheres to a rail; and a torque correcting portion configured to correct the basic value of the torque to obtain a corrected value that is smaller than the basic value. The plurality of wheelsets includes one or more specific wheelsets and one or more general wheelsets other than the specific wheelsets. The torque correcting portion calculates the corrected value of the torque, applied to the general wheelset, in accordance with a first rule and calculates the corrected value of the torque, applied to the specific wheelset, in accordance with a second rule different from the first rule.

Abstract: A vehicular power conversion device is provided with a semiconductor that converts power. The power conversion device is provided with: coolers that are arranged in an array in a vehicle advancement direction and cool the semiconductor; and a cooler cover having the coolers located therein and provided with ventilation openings serving as an intake port and a discharge port for travel-generated airflow. A cavity serving as a passageway for the travel-generated airflow is provided in at least one of above, below, and to the side of the plurality of coolers inside the cooler cover. The ventilation openings are disposed in the vehicle advancement direction from the cavity. The airflow-receiving plate is located in the cavity and, when the travel-generated airflow flows from the ventilation opening into the cavity, changes the direction of the incoming travel-generated airflow to a direction toward the coolers.

Abstract: A power conversion device includes an inverter that drives a motor; a fin that cools down the inverter; a first core including a through hole that allows passage of a positive side conductor that connects a power supply system and the inverter and a negative side conductor that grounds the inverter; a ground conductor that grounds the fin; a ground conductor that grounds a motor yoke via a capacitor; and a ground conductor including one end that is connected to the negative side conductor or the ground conductor and the other end that is grounded.

Abstract: A filter device that removes a noise current generated by an inverter includes a first filter capacitor that is provided in parallel to a direct-current unit of the inverter, a first filter reactor that is provided between a high-potential side of the first filter capacitor and an overhead line that is a power supply source of direct-current power, and a series circuit unit in which a fuse serving as a circuit disconnecting unit that is disconnected when a current larger than a rated current flows therein, a second filter reactor serving as an inductance element, and a second filter capacitor serving as a capacitance element are connected in series, where one end of the series circuit unit is connected to a low-potential side of the first filter capacitor and one end of the first filter reactor is connected to the series circuit unit.

Abstract: There is provided a control device for an electric motor that controls the operation of the electric motor by outputting PWM signals to switching elements included in an inverter. The control device for the electric motor includes a voltage-command generating unit configured to generate, as voltage commands Vu*, Vv*, and Vw*, a superimposed wave signal obtained by superimposing, on a sine wave having an inverter output frequency FINV as a fundamental frequency, a third harmonic of the sine wave and a PWM-signal generating unit configured to generate PWM signals U, V, W, X, Y, and Z by comparing the amplitude of the voltage commands output by the voltage-command generating unit and the amplitude of a carrier signal CAR.

Abstract: A power conversion device includes a main circuit unit (direct-current main circuit) that converts direct-current power into alternating-current power, and a control unit that controls the direct-current main circuit. The direct-current main circuit includes a voltage detector (detector) that detects a capacitor voltage and a discharge circuit that discharges energy accumulated in a capacitor. The control unit includes a detection circuit that estimates a capacitor voltage during a normal operation based on a voltage transmitted from the voltage detector in a state where the main circuit unit is disconnected from a power supply and that detects a sign that a short circuit fault occurs in the capacitor, and a control circuit that outputs a control signal for controlling the discharge circuit to operate when the control circuit receives a detection signal from the detection circuit.

Abstract: A power conversion device includes an inverter that drives a motor; a fin that cools down the inverter; a first core including a through hole that allows passage of a positive side conductor that connects a power supply system and the inverter and a negative side conductor that grounds the inverter; a ground conductor that grounds the fin; a ground conductor that grounds a motor yoke via a capacitor; and a ground conductor including one end that is connected to the negative side conductor or the ground conductor and the other end that is grounded.

Abstract: There is provided a control device for an electric motor that controls the operation of the electric motor by outputting PWM signals to switching elements included in an inverter. The control device for the electric motor includes a voltage-command generating unit configured to generate, as voltage commands Vu*, Vv*, and Vw*, a superimposed wave signal obtained by superimposing, on a sine wave having an inverter output frequency FINV as a fundamental frequency, a third harmonic of the sine wave and a PWM-signal generating unit configured to generate PWM signals U, V, W, X, Y, and Z by comparing the amplitude of the voltage commands output by the voltage-command generating unit and the amplitude of a carrier signal CAR.

Abstract: A power conversion device includes a main circuit unit (direct-current main circuit) that converts direct-current power into alternating-current power, and a control unit that controls the direct-current main circuit. The direct-current main circuit includes a voltage detector (detector) that detects a capacitor voltage and a discharge circuit that discharges energy accumulated in a capacitor. The control unit includes a detection circuit that estimates a capacitor voltage during a normal operation based on a voltage transmitted from the voltage detector in a state where the main circuit unit is disconnected from a power supply and that detects a sign that a short circuit fault occurs in the capacitor, and a control circuit that outputs a control signal for controlling the discharge circuit to operate when the control circuit receives a detection signal from the detection circuit.

Abstract: A heat sink including a compact cooling system, superior uniformity of heating, provides a compact cooling unit superior in uniformity of cooling. A heat sink includes a header for distribution connected to a cooling fluid inlet, a header for confluence connected to a cooling fluid outlet and parallel to and adjacent to the header for distribution and a heat transfer vessel including a heating element mounting surface as well as channels inside. The channels are connected to the header for distribution and the header for confluence.

Abstract: In a conventional cooling device, a heat pipe or a circulation-type liquid cooler provided with a pump is used and therefore, a large space is needed for the cooling device. There is provided a cooling device which includes a plurality of cooling modules having cooling units for cooling heat-generating elements by coolant and radiation units for radiating heat from the coolant heated in the cooling units, the plurality of cooling modules being bubble-pump-type ones in which the coolant is circulated between the radiation units and the cooling units by the coolant being boiled in the cooling units, the radiation units being arranged side by side, and a cooling fan for generating wind blowing the radiation units.

Abstract: A power conversion device in which the inductance of a main circuit is reduced, a surge voltage is suppressed, elements are properly cooled, which is miniaturized and reduced in weight as a whole, and is excellent in handling performance in a manufacturing process and a maintenance work. A positive side arm unit includes IGBT modules, a coupling diode module, a cooling plate on which the modules are mounted, and a first laminated bus bar connected to the respective modules. A negative side arm unit includes IGBT modules, a coupling diode module, a cooling plate on which the modules are mounted, and a second laminated bus bar connected to the respective modules, and both the laminated bus bars and the capacitors are connected to one another by a third laminated bus bar. Both the cooling plates are parallel to each other so that the mount surfaces thereof are set in the same direction.

Abstract: A power conversion device in which the inductance of a main circuit is reduced, a surge voltage is suppressed, elements are properly cooled, which is miniaturized and reduced in weight as a whole, and is excellent in handling performance in a manufacturing process and a maintenance work. A positive side arm unit includes IGBT modules, a coupling diode module, a cooling plate on which the modules are mounted, and a first laminated bus bar connected to the respective modules. A negative side arm unit includes IGBT modules, a coupling diode module, a cooling plate on which the modules are mounted, and a second laminated bus bar connected to the respective modules, and both the laminated bus bars and the capacitors are connected to one another by a third laminated bus bar. Both the cooling plates are parallel to each other so that the mount surfaces thereof are set in the same direction.

Abstract: A heat sink includes a heat-transfer container incorporating a flow path through which a cooling fluid flows, for cooling a heating element in contact with the heat-transfer container The flow path includes a first cross-sectional portion that becomes narrower as the distance between a given point in the flow path and a side of the heat-transfer container which makes contact with the heating element becomes longer in a direction perpendicular to the direction in which the cooling fluid flows, and a second cross-sectional portion that is approximately constant in the direction perpendicular to the direction in which the cooling fluid flows. The first cross-sectional portion and the second cross-sectional portion alternately continue in the direction in which the cooling fluid flows causing a three-dimensional flow so the heat-transfer properties are enhanced with a simplified structure.

Abstract: In a conventional cooling device, a heat pipe or a circulation-type liquid cooler provided with a pump is used and therefore, a large space is needed for the cooling device. There is provided a cooling device which includes a plurality of cooling modules 6 having cooling units 6A for cooling heat-generating elements 7 by coolant and radiation units 6C for radiating heat from the coolant heated in the cooling units 6A, the plurality of cooling modules being bubble-pump-type ones in which the coolant is circulated between the radiation units 6C and the cooling units 6A by the coolant being boiled in the cooling units 6A, the radiation units 6C being arranged side by side, and a cooling fan 2 for generating wind blowing the radiation units 6C.

Abstract: A heat sink including a compact cooling system, superior uniformity of heating, provides a compact cooling unit superior in uniformity of cooling. A heat sink includes a header for distribution connected to a cooling fluid inlet, a header for confluence connected to a cooling fluid outlet and parallel to and adjacent to the header for distribution and a heat transfer vessel including a heating element mounting surface as well as channels inside. The channels are connected to the header for distribution and the header for confluence.

Abstract: There is provided a cooling device which includes a plurality of cooling modules 6 having cooling units 6A for cooling heat-generating elements 7 by coolant and radiation units 6C for radiating heat from the coolant heated in the cooling units 6A, the plurality of cooling modules being bubble-pump-type ones in which the coolant is circulated between the radiation units 6C and the cooling units 6A by the coolant being boiled in the cooling units 6A, the radiation units 6C being arranged side by side, and a cooling fan 2 for generating wind blowing the radiation units 6C.

Abstract: When first and second intelligent power module type semiconductor switching circuits configured by an IGBT respectively are connected in parallel, collectors of IGBT are connected to each other, and emitters of the IGBT are connected to each other. And, a resistor is connected to each of the emitters. Both of the resistors and have the same resistance value. Then, the emitters are connected to each other by an emitter auxiliary terminal connection line via this resistor and the auxiliary terminal. In addition, gates of the IGBT and the IGBT are connected to each other by a gate auxiliary terminal connection line via this resistor and a ferrite beads core that has a high impedance at a predetermined frequency.