A technology that prevents an encapsulation member encapsulating a semiconductor element from leaking between a resin-made casing and a heat dissipator is provided. A power conversion device includes a heat dissipator that includes a mount surface on which semiconductor elements are mounted, a resin-made casing that includes an intimate-contact surface that intimately contacts the mount surface, and which contains therein the semiconductor elements, and an encapsulation member that encapsulates the semiconductor elements within the casing. A first surrounding portion that surrounds the semiconductor elements is provided on the mount surface of the heat dissipator. A second surrounding portion that surrounds the semiconductor elements is provided on the intimate-contact surface of the casing. The first surrounding portion and the second surrounding portion are fitted with each other in the concavo-convex shape.

An inverter assembly for a motor vehicle includes a housing with an inlet end for receiving a flow of coolant and an outlet end for discharging the flow of coolant. The assembly further includes a first plurality of power transistors conducting and switching an electrical current and generating a first amount of heat. The assembly further includes a second plurality of power transistors conducting and switching the electrical current and generating a second amount of heat that is less than the first amount of heat. A heat sink includes a plate with a first section adjacent to the first plurality of power transistors and a second section adjacent to the second plurality of power transistors. The heat sink further includes a first plurality of fins for drawing the first amount of heat from the first section and a guide vane directing the flow of coolant toward the first plurality of fins.

A power conversion apparatus includes: a first stage on which a first module is mounted, a second stage stacked on the first stage and on which a second module is mounted, and a coolant circulation circuit allowing a coolant to circulate through the first and second modules. The coolant circulation circuit includes a first cooling pipe disposed on the first stage, a second cooling pipe disposed on the second stage, a first connecting member provided at an opening end of the first cooling pipe, a second connecting member provided at an opening end of the second cooling pipe, a connecting pipe connecting the first connecting member and the second connecting member, a first coupler that couples a first end portion of the connecting pipe to the first connecting member, and a second coupler that couples a second end portion of the connecting pipe to the second connecting member.

Providing electric power distribution for fracturing operations comprising receiving, at a transport, electric power from a mobile source of electricity at a first voltage level and supplying, from the transport, the electric power to a fracturing pump transport at the first voltage level using only a first, single cable connection. The first voltage level falls within a range of 1,000 V to 35 kilovolts. The transport also supplies electric power to a second transport at the first voltage level using only a second, single cable connection.

Providing electric power distribution for fracturing operations comprising receiving, at a transport, electric power from a mobile source of electricity at a first voltage level and supplying, from the transport, the electric power to a fracturing pump transport at the first voltage level using only a first, single cable connection. The first voltage level falls within a range of 1,000 V to 35 kilovolts. The transport also supplies electric power to a second transport at the first voltage level using only a second, single cable connection.

A power inverter may include a housing including an arrangement space having a capacitor arranged in a center portion thereof, a pair of cooling spaces formed on opposite sides of the arrangement space and include first and second cooling spaces, a cooling passage communicating first ends of the pair of cooling spaces with each other, and a pair of through holes respectively fluidically-connecting second ends of the pair of cooling spaces to outside of the power inverter apparatus; a first cooling plate coupled to the first cooling space to seal the first cooling space thereby; a second cooling plate coupled to the second cooling space and provided with a pair of flow holes; a first power module contacting with the first cooling plate; a second power module contacting with the second cooling plate; an extrusion cooler contacting with the second power module; and a third power module contacting with the extrusion cooler.

To improve cooling capability, power conversion apparatus 1 that converts a direct current voltage into an alternating current voltage includes: first substrate 100 on which power conversion circuit 2 is mounted; second substrate 200 on which driving circuit 3 that drives power conversion circuit 2 is mounted; and shield plate 300 that is disposed between first substrate 100 and second substrate 200, and first substrate 100 is a metal substrate.

A three-phase regenerative drive configured for operation from a single phase alternating current (AC) power source, the three-phase regenerative drive including a three-phase converter having inputs for connection to a single-phase AC source, the three-phase converter having three phase legs, a three-phase inverter for connection to a motor, the three phase inverter configured to provide three phase command signals to the motor, and a DC bus connected between the three-phase converter and the three-phase inverter. A first phase leg of the three-phase converter and a second phase leg of the three-phase converter are employed to direct current from the single-phase AC source to the DC Bus and a third phase leg of the three phase legs of the three-phase converter returns current to a return of the AC source.

A three-phase regenerative drive configured for operation from a single phase alternating current (AC) power source, the three-phase regenerative drive including a three-phase converter having inputs for connection to a single-phase AC source, the three-phase converter having three phase legs, a three-phase inverter for connection to a motor, the three phase inverter configured to provide three phase command signals to the motor, and a DC bus connected between the three-phase converter and the three-phase inverter. A first phase leg of the three-phase converter and a second phase leg of the three-phase converter are employed to direct current from the single-phase AC source to the DC Bus and a third phase leg of the three phase legs of the three-phase converter returns current to a return of the AC source.

An efficient, high density, inline converter module includes a power conversion circuit and an input wiring harness for connecting the input of the power circuit to a unipolar source. A second wiring harness or electrical connectors may be provided for connecting the output of the power conversion circuit to a load. Connections between a wiring harness and the power conversion circuit may comprise conductive contacts, configured to distribute heat. The power circuit may be over molded to provide electrical insulation and efficient heat transfer to external ambient air. A DC transformer based inline converter module may be used in AC adapter, vehicular, and power system architectures. An input connector for connecting the input wiring harness to the input source may be provided. In some embodiments the input source may be an AC source and the input connector may comprise a rectifier for delivering a rectified, unipolar, voltage to the input of the power conversion assembly via an input wiring harness. By separating the rectifier from the power conversion assembly, the power conversion assembly may be packaged into a smaller volume than would be required if the rectifier, and its associated heat loss, were included in the power conversion assembly.